Capability signaling to enable full power uplink transmission
阅读说明：本技术 使能全功率上行链路传输的能力信令 (Capability signaling to enable full power uplink transmission ) 是由 麦德·赛弗·拉赫曼 埃科·努格罗霍·昂高萨努斯 于 2020-04-22 设计创作，主要内容包括：本公开涉及一种用于融合支持超过第四代(4G)系统的更高数据速率的第五代(5G)通信系统与物联网(IoT)技术的通信方法和系统。本公开可以应用于基于5G通信技术和IoT相关技术的智能服务,诸如智能家居、智能建筑、智能城市、智能汽车、连接汽车、医疗保健、数字教育、智能零售、安全和安保服务。提供了一种用于操作用户设备(UE)的方法。方法包括：向基站BS发送包括UE的全功率传输能力的UE能力信息,其中UE的全功率传输能力包括指示一组全功率发射预编码矩阵指示符TPMI的参数S；从BS接收用于物理上行链路共享信道PUSCH传输的配置信息,其中配置信息包括TPMI；确定PUSCH传输；确定PUSCH传输的功率电平；以所确定的功率电平向BS发送PUSCH传输,其中功率电平与基于包括在一组全功率TPMI中的TPMI的全功率对应,并且其中TPMI指示用于PUSCH传输的预编码矩阵和层数。(The present disclosure relates to a communication method and system for fusing a fifth generation (5G) communication system supporting a higher data rate than a fourth generation (4G) system with internet of things (IoT) technology. The present disclosure may be applied to smart services based on 5G communication technologies and IoT related technologies, such as smart homes, smart buildings, smart cities, smart cars, connected cars, healthcare, digital education, smart retail, security and security services. A method for operating a User Equipment (UE) is provided. The method comprises the following steps: transmitting UE capability information including full power transmission capability of the UE to a base station BS, wherein the full power transmission capability of the UE includes a parameter S indicating a set of full power transmission precoding matrix indicators TPMI; receiving configuration information for physical uplink shared channel, PUSCH, transmission from a BS, wherein the configuration information includes a TPMI; determining a PUSCH transmission; determining a power level of a PUSCH transmission; transmitting the PUSCH transmission to the BS at the determined power level, wherein the power level corresponds to full power based on TPMI included in a set of full power TPMI, and wherein the TPMI indicates a precoding matrix and a number of layers for the PUSCH transmission.)
1. A user equipment, UE, comprising:
a transceiver configured to:
transmitting UE capability information to a base station BS, the UE capability information including full power transmission capability of the UE, wherein the full power transmission capability of the UE includes a parameter S indicating a set of full power transmit precoding matrix indicators TPMI; and
receiving configuration information for physical uplink shared channel, PUSCH, transmission from the BS, wherein the configuration information comprises a TPMI; and
a processor operatively connected to the transceiver, the processor configured to, based on the configuration information:
determining the PUSCH transmission; and
determining a power level for the PUSCH transmission,
wherein the transceiver is further configured to transmit the PUSCH transmission to the BS at the determined power level,
wherein if the TPMI is included in the set of full power TPMIs, then the power level corresponds to full power, an
Wherein the TPMI indicates a precoding matrix and a number of layers for the PUSCH transmission.
2. The UE of claim 1, wherein the transceiver is configured to receive the portion of the configuration information including the TPMI via Downlink Control Information (DCI).
3. The UE of claim 1, wherein the UE capability information includes a coherence capability of antenna ports at the UE, wherein the coherence capability is one of non-coherent or partially coherent, the partially coherent indicating a layer at most two antenna ports at the UE are available to transmit the PUSCH transmission, and the non-coherent indicating a layer at only a single antenna port at the UE is available to transmit the PUSCH transmission.
4. The UE of claim 1, wherein, when the UE has 2 antenna ports and the set of full-power TPMIs corresponds to a non-coherent TPMI group, the parameter S indicates one of the TPMI groups G0... G2 given by:
5. the UE of claim 1, wherein, when the UE has 4 antenna ports and the set of full-power TPMIs corresponds to a non-coherent TPMI group, the parameter S indicates one of the TPMI groups G0... G3 given by:
6. the UE of claim 1, wherein, when the UE has 4 antenna ports and the set of full-power TPMIs corresponds to a partially coherent TPMI group, the parameter S indicates one of the TPMI groups G0... G6 given by the following table:
7. a base station, BS, comprising:
a transceiver configured to receive, from a user equipment, UE capability information comprising a full power transmission capability of the UE, wherein the full power transmission capability of the UE comprises a parameter, S, indicating a set of full power transmit precoding matrix indicators, TPMI; and
a processor operatively coupled to the transceiver, the processor configured to generate configuration information for physical uplink shared channel, PUSCH, transmissions, wherein the configuration information comprises a TPMI;
wherein the transceiver is further configured to:
sending the configuration information for the PUSCH transmission to the UE; and
receive the PUSCH transmission from the UE, transmit the PUSCH transmission at a power level,
wherein if the TPMI is included in a set of full power TPMIs, then the power level corresponds to full power, an
Wherein the TPMI indicates a precoding matrix and a number of layers for the PUSCH transmission.
8. The BS of claim 7, wherein the transceiver is configured to transmit the portion of the configuration information including the TPMI via downlink control information, DCI.
9. The BS of claim 7, wherein the UE capability information includes a coherence capability of antenna ports at the UE, wherein the coherence capability is one of non-coherent or partially coherent, the partially coherent indicating a layer at most two antenna ports at the UE are available to transmit the PUSCH transmission, and the non-coherent indicating a layer at only a single antenna port at the UE is available to transmit the PUSCH transmission.
10. The BS of claim 7, wherein, when the UE has 2 antenna ports and the set of full-power TPMIs corresponds to a non-coherent TPMI group, the parameter S indicates one of the TPMI groups G0... G2 given by:
11. the BS of claim 7, wherein, when the UE has 4 antenna ports and the set of full-power TPMIs corresponds to a non-coherent TPMI group, the parameter S indicates one of the TPMI groups G0... G3 given by:
12. a method for operating a user equipment, UE, the method comprising:
transmitting UE capability information to a base station BS, the UE capability information including full power transmission capability of the UE, wherein the full power transmission capability of the UE includes a parameter S indicating a set of full power transmit precoding matrix indicators TPMI; and
receiving configuration information for physical uplink shared channel, PUSCH, transmission from the BS, wherein the configuration information comprises a TPMI;
determining the PUSCH transmission;
determining a power level for the PUSCH transmission; and
sending the PUSCH transmission to the BS at the determined power level, an
Wherein the power level corresponds to full power based on the TPMI being included in the set of full power TPMIs, an
Wherein the TPMI indicates a precoding matrix and a number of layers for the PUSCH transmission.
13. The method of claim 12, further comprising receiving a portion of the configuration information including the TPMI via downlink control information, DCI.
14. The method of claim 12, wherein the UE capability information includes a coherence capability of antenna ports at the UE, wherein the coherence capability is one of non-coherent or partially coherent, the partially coherent indicating a layer at most two antenna ports at the UE are available to transmit the PUSCH transmission, and the non-coherent indicating a layer at only a single antenna port at the UE is available to transmit the PUSCH transmission.
15. The method of claim 12, wherein, when the UE has 2 antenna ports and the set of full-power TPMI corresponds to a non-coherent TPMI group, the parameter S indicates one of the TPMI groups G0... G2 given by the following table:
Technical Field
The present disclosure generally relates to full power UL MIMO operation for next generation cellular systems.
Background
In order to meet the increasing demand for wireless data services since the deployment of 4G communication systems, efforts have been made to develop improved 5G or top 5G communication systems. Accordingly, the 5G or first 5G communication system is also referred to as a "super 4G network" or a "post-LTE system". 5G communication systems are considered to be implemented in the higher frequency (mmWave) band (e.g., 60GHz band) in order to achieve higher data rates. In order to reduce propagation loss of radio waves and increase transmission distance, beamforming, massive Multiple Input Multiple Output (MIMO), full-dimensional MIMO (FD-MIMO), array antenna, analog beamforming, and massive antenna techniques are discussed in the 5G communication system. Further, in the 5G communication system, development of system network improvement is being performed based on advanced small cells, cloud Radio Access Network (RAN), ultra-dense network, device-to-device (D2D) communication, wireless backhaul, mobile network, cooperative communication, coordinated multipoint (CoMP), receiving-side interference cancellation, and the like. In 5G systems, hybrid FSK and QAM modulation (FQAM) and Sliding Window Superposition Coding (SWSC) have been developed as Advanced Coding Modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and Sparse Code Multiple Access (SCMA) as advanced access techniques.
The internet, which is a connectivity network where human-centric humans generate and use information, is now evolving into the internet of things (IoT) where distributed entities such as things exchange and process information without human intervention. An internet of everything (IoE) combining IoT technology and big data processing technology by connecting with a cloud server has appeared. For IoT implementations, technical elements such as "sensing technologies", "wired/wireless communication and network infrastructure", "service interface technologies", and "security technologies" have been required, and sensor networks, machine-to-machine (M2M) communication, machine type communication, and the like have been recently studied. Such an IoT environment can provide intelligent internet technology services that create new value for human life by collecting and analyzing data generated between connected things. Through the convergence and combination between existing information technology and various industrial applications, IoT may be applied in various fields, including smart homes, smart buildings, smart cities, smart cars or interconnected cars, smart grids, healthcare, smart homes, and advanced medical services.
In view of this, various attempts have been made to apply the 5G communication system to the IoT network. For example, techniques such as sensor networks, Machine Type Communication (MTC), and machine-to-machine (M2M) communication may be implemented through beamforming, MIMO, and array antennas. The application of cloud Radio Access Networks (RANs) as the big data processing technology described above can also be considered as an example of the convergence between 5G technology and IoT technology.
Understanding and correctly estimating the UL channel between a User Equipment (UE) and a enode B (gNB) is important for efficient and effective wireless communication. To correctly estimate the UL channel conditions, the UE may send reference signals (e.g., SRS) to the gNB for UL channel measurements. With UL channel measurements, the gNB is able to select appropriate communication parameters to efficiently and effectively perform wireless data communications with the UE in the UL.
Disclosure of Invention
[ problem ] to
Embodiments of the present disclosure provide methods and apparatus for full power UL MIMO operation in advanced wireless communication systems.
[ solution ]
In one embodiment, a User Equipment (UE) for Uplink (UL) transmission is provided. The UE includes a transceiver configured to transmit, to a Base Station (BS), UE capability information including full power transmission capability of the UE, wherein the full power transmission capability of the UE includes a parameter S indicating a set of full power Transmit Precoding Matrix Indicators (TPMI); receiving configuration information for Physical Uplink Shared Channel (PUSCH) transmission from a BS, wherein the configuration information includes a TPMI. The UE further includes a processor operatively connected to the transceiver, the processor configured to determine a PUSCH transmission; a power level for the PUSCH transmission is determined. The transceiver is further configured to transmit a PUSCH transmission to the BS at the determined power level, wherein the power level corresponds to full power if the TPMI is included in a set of full-power TPMIs and wherein the TPMI indicates a precoding matrix and a number of layers for the PUSCH transmission.
In another embodiment, a Base Station (BS) is provided. The BS includes a transceiver configured to receive, from a User Equipment (UE), UE capability information including a full power transmission capability of the UE, wherein the full power transmission capability of the UE includes a parameter S indicating a set of full power Transmit Precoding Matrix Indicators (TPMI). The BS further includes a processor operatively coupled to the transceiver, the processor configured to generate configuration information for Physical Uplink Shared Channel (PUSCH) transmission, wherein the configuration information includes the TPMI. The transceiver is further configured to transmit configuration information for PUSCH transmission to the UE; receiving a PUSCH transmission from the UE transmitted at a power level, wherein the power level corresponds to full power if the TPMI is included in a set of full-power TPMIs and wherein the TPMI indicates a precoding matrix and a number of layers for the PUSCH transmission.
In yet another embodiment, a method for operating a User Equipment (UE) is provided. Sending UE capability information including full power transmission capability of the UE to a base station BS, wherein the full power transmission capability of the UE comprises a parameter S indicating a group of full power transmission precoding matrix indicators TPMI; receiving configuration information for physical uplink shared channel, PUSCH, transmission from a BS, wherein the configuration information includes a TPMI; determining a PUSCH transmission; determining a power level of a PUSCH transmission; transmitting the PUSCH transmission to the BS at the determined power level, wherein the power level corresponds to full power based on TPMI included in a set of full power TPMI, and wherein the TPMI indicates a precoding matrix and a number of layers for the PUSCH transmission.
Other technical features may be readily apparent to one skilled in the art from the following figures, descriptions, and claims.
Before proceeding with the following detailed description, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document. The term "couple" and its derivatives refer to any direct or indirect communication between two or more elements, whether or not those elements are in physical contact with one another. The terms "transmit," "receive," and "communicate," as well as derivatives thereof, encompass both direct and indirect communication. The terms "include" and "comprise," as well as derivatives thereof, mean inclusion without limitation. The term "or" is inclusive, meaning and/or. The phrase "associated with …" and derivatives thereof means including, included within …, interconnected with …, included within …, connected to or …, coupled to or coupled with …, in communication with …, cooperating with …, interleaved, juxtaposed, proximate, bound to or bound with …, having characteristics of …, having a relationship of … to …, and the like. The term "controller" refers to any device, system, or part thereof that controls at least one operation. Such a controller may be implemented in hardware or a combination of hardware and software and/or firmware. The functionality associated with any particular controller may be centralized or distributed, whether locally or remotely. The phrase "at least one of, when used in conjunction with a list of items, means that different combinations of one or more of the listed items can be used and only one item in the list can be needed. For example, "at least one of A, B and C" includes any one of the following combinations: A. b, C, A and B, A and C, B and C, and a and B and C.
In addition, various functions described below may be implemented or supported by one or more computer programs, each computer program formed from computer-readable program code and embodied in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, sets of instructions, procedures, functions, objects, classes, examples, related data, or portions thereof adapted for implementation in suitable computer readable program code. The phrase "computer readable program code" includes any type of computer code, including source code, object code, and executable code. The phrase "computer readable medium" includes any type of medium capable of being accessed by a computer, such as Read Only Memory (ROM), Random Access Memory (RAM), a hard disk drive, a Compact Disc (CD), a Digital Video Disc (DVD), or any other type of memory. A "non-transitory" computer-readable medium does not include a wired, wireless, optical, or other communication link that transmits transitory electrical or other transitory signals. Non-transitory computer readable media include media that can permanently store data, as well as media that can store data and subsequently rewrite data, such as rewritable optical disks or erasable memory devices.
Definitions for certain other words and phrases are provided throughout this patent document. Those of skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases.
[ advantageous effects ]
According to embodiments of the present disclosure, the UE may send appropriate reference signals to the gNB with UL channel measurements already made. With this UL channel measurement, the gNB can select appropriate communication parameters to efficiently and effectively perform wireless data communication with the UE in the UL.
Drawings
For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, wherein like reference numbers represent like parts:
fig. 1 illustrates an example wireless network in accordance with an embodiment of the present disclosure;
fig. 2 illustrates an exemplary gNB in accordance with embodiments of the present disclosure;
fig. 3 illustrates an exemplary UE according to an embodiment of the present disclosure;
fig. 4A illustrates a high-level diagram of an orthogonal frequency division multiple access transmit path according to an embodiment of the present disclosure;
fig. 4B illustrates a high-level diagram of an orthogonal frequency division multiple access receive path according to an embodiment of the present disclosure;
fig. 5 shows a transmitter block diagram of a PDSCH in a subframe according to an embodiment of the disclosure;
fig. 6 shows a receiver block diagram of PDSCH in a subframe according to an embodiment of the disclosure;
fig. 7 shows a transmitter block diagram of PUSCH in a subframe according to an embodiment of the present disclosure;
fig. 8 shows a receiver block diagram of PUSCH in a subframe according to an embodiment of the present disclosure;
fig. 9 illustrates an exemplary multiplexing of two slices according to an embodiment of the present disclosure;
fig. 10 illustrates an exemplary antenna block in accordance with an embodiment of the present disclosure;
fig. 11 illustrates an example network configuration according to an embodiment of this disclosure;
fig. 12 illustrates an example of a TPMI packet based on Power Amplifier (PA) power values according to an embodiment of the present disclosure;
fig. 13 shows an example of a virtualized SRS port for a UE with two Tx chains, according to an embodiment of the disclosure;
fig. 14 shows a flow diagram of a method for operating a User Equipment (UE) in accordance with an embodiment of the present disclosure; and
fig. 15 shows a flow diagram of another method for receiving UL transmissions that may be performed by a Base Station (BS) in accordance with an embodiment of the present disclosure.
Detailed Description
Figures 1 through 15, discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged system or device.
The following documents and standard descriptions are incorporated into this disclosure by reference as if fully set forth herein: 3GPP TS 36.211v16.1.0, "E-UTRA, Physical channels and modulation; "3 GPP TS 36.212v16.1.0," E-UTRA, Multiplex and Channel coding (multiplexing and Channel coding); "3 GPP TS 36.213v16.1.0," E-UTRA, Physical Layer Procedures; "3 GPP ts36.321v16.1.0," E-UTRA, Medium Access Control (MAC) protocol specification); "3 GPP TS 36.331v16.1.0," E-UTRA, Radio Resource Control (RRC) protocol specification); "3 GPP TR 22.891 v14.2.0; 3GPP TS 38.211v16.1.0, "E-UTRA, NR, Physical channels and modulation"; 3GPP TS 38.213v16.1.0, "E-UTRA, NR, Physical Layer Procedures for control"; 3GPP ts38.214v16.1.0, "E-UTRA, NR, Physical layer procedure for data"; and 3GPP TS 38.212v16.1.0, "E-UTRA, NR, Multiplexing and channel coding".
The aspects, features and advantages of the present disclosure will become apparent from the following detailed description, simply by way of illustration of various specific embodiments and implementations, including the best mode contemplated for carrying out the present disclosure. The disclosure is capable of other and different embodiments and its several details are capable of modification in various, obvious aspects all without departing from the spirit and scope of the present disclosure. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive. The present disclosure is illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings.
In the following, for the sake of brevity, FDD and TDD are both considered as duplex methods for DL and UL signaling.
Although the following exemplary description and embodiments assume Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA), the present disclosure may be extended to other OFDM-based transmission waveforms or multiple access schemes, such as filtered OFDM (F-OFDM).
The present disclosure encompasses several components that may be used in conjunction or combination with each other or may operate as a standalone solution.
In order to meet the increasing demand for wireless data services since the deployment of 4G communication systems, efforts have been made to develop improved 5G or top 5G communication systems. Accordingly, the 5G or first 5G communication system is also referred to as a "super 4G network" or a "post-LTE system".
5G communication systems are considered to be implemented in the higher frequency (mmWave) band (e.g., 60GHz band) in order to achieve higher data rates. In order to reduce propagation loss of radio waves and increase transmission coverage, beamforming, massive Multiple Input Multiple Output (MIMO), full-dimensional MIMO (FD-MIMO), array antenna, analog beamforming, and massive antenna techniques are discussed in the 5G communication system.
Further, in the 5G communication system, development of system network improvement is being performed based on advanced small cells, cloud Radio Access Network (RAN), ultra-dense network, device-to-device (D2D) communication, wireless backhaul, mobile network, cooperative communication, coordinated multipoint (CoMP) transmission and reception, interference mitigation and cancellation, and the like.
In the 5G system, hybrid frequency shift keying and quadrature amplitude modulation (FQAM) and Sliding Window Superposition Coding (SWSC) have been developed as Adaptive Coding Modulation (ACM) techniques, and Filter Bank Multicarrier (FBMC), non-orthogonal multiple access (NOMA) and Sparse Code Multiple Access (SCMA) techniques as advanced access techniques.
Fig. 1 through 4B below describe various embodiments implemented in a wireless communication system and using Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA) communication techniques. The descriptions of fig. 1-3 are not meant to imply physical or architectural limitations to the manner in which different embodiments may be implemented. The different embodiments of the present disclosure may be implemented in any suitably arranged communication system.
Fig. 1 illustrates an example wireless network in accordance with an embodiment of the present disclosure. The embodiment of the wireless network shown in fig. 1 is for illustration only. Other embodiments of the wireless network 100 may be used without departing from the scope of this disclosure.
As shown in fig. 1, the wireless network includes a gNB 101, a gNB102, and a gNB 103. gNB 101 communicates with gNB102 and gNB 103. The gNB 101 also communicates with at least one network 130, such as the internet, a proprietary Internet Protocol (IP) network, or other data network.
gNB102 provides wireless broadband access to network 130 for a first plurality of User Equipments (UEs) within coverage area 120 of gNB 102. The first plurality of UEs includes: a UE 111 that may be located in a small enterprise (SB); a UE 112 that may be located in enterprise (E); UE 113, which may be located in a WiFi Hotspot (HS); a UE 114 that may be located in a first residence (R); a UE 115 that may be located in a second residence (R); and a UE116 which may be a mobile device (M) such as a cellular telephone, wireless laptop computer, wireless PDA, etc. gNB 103 provides wireless broadband access to network 130 for a second plurality of UEs within coverage area 125 of gNB 103. The second plurality of UEs includes UE 115 and UE 116. In some embodiments, one or more of the gnbs 101-103 may communicate with each other and with UEs 111-116 using 5G, LTE-a, WiMAX, WiFi, or other wireless communication technologies.
Depending on the network type, the term "base station" or "BS" may refer to any component (or collection of components) configured to provide wireless access to the network, such as a Transmission Point (TP), a transmission-reception point (TRP), an enhanced base station (eNodeB or eNB), a 5G base station (gNB), a macrocell, a femtocell, a WiFi Access Point (AP), or other wireless enabled device. The base station may provide wireless access in accordance with one or more wireless communication protocols (e.g., 5G 3GPP new radio interface/access (NR), Long Term Evolution (LTE), LTE-advanced (LTE-a), High Speed Packet Access (HSPA), Wi-Fi 802.11a/b/G/n/ac, etc.). For convenience, the terms "BS" and "TRP" are used interchangeably in this patent document to refer to network infrastructure components that provide wireless access to a remote terminal. Further, the term "user equipment" or "UE" may refer to any component, such as a "mobile station," "subscriber station," "remote terminal," "wireless terminal," "reception point," or "user equipment," depending on the type of network. For convenience, the terms "user equipment" and "UE" are used in this patent document to refer to a remote wireless device that wirelessly accesses a BS, whether the UE is a mobile device (such as a mobile phone or smartphone) or generally considered a stationary device (such as a desktop computer or vending machine).
The dashed lines illustrate the approximate extent of coverage areas 120 and 125, and for purposes of illustration and explanation, coverage areas 120 and 125 are shown as approximately circular. It should be clearly understood that the coverage areas associated with the gNB (such as coverage areas 120 and 125) may have other shapes including irregular shapes, depending on the configuration of the gNB and variations in the radio environment associated with natural and man-made obstructions.
As described in more detail below, one or more of UE 111-UE 116 include circuitry, programming, or a combination thereof for UL codebook-based UL transmission in advanced wireless communication systems. In certain embodiments, one or more of gnbs 101-103 include circuitry, programming, or a combination thereof to facilitate UL codebook-based UL transmission in advanced wireless communication systems.
Although fig. 1 shows one example of a wireless network, various changes may be made to fig. 1. For example, a wireless network may include any number of gnbs and any number of UEs in any suitable arrangement. Further, the gNB 101 may communicate directly with any number of UEs and provide those UEs with wireless broadband access to the network 130. Similarly, each of gNB102 and gNB 103 may communicate directly with network 130 and provide UEs with direct wireless broadband access to network 130. Further, the gnbs 101, 102, and/or 103 may provide access to other or additional external networks, such as external telephone networks or other types of data networks.
Fig. 2 illustrates an exemplary gNB102 in accordance with embodiments of the present disclosure. The embodiment of gNB102 shown in fig. 2 is for illustration only, and gnbs 101 and 103 of fig. 1 may have the same or similar configuration. However, the gNB has a variety of configurations, and fig. 2 does not limit the scope of the present disclosure to any particular implementation of the gNB.
As shown in fig. 2, the gNB102 includes a plurality of antennas 205a through 205n, a plurality of RF transceivers 210a through 210n, Transmit (TX) processing circuitry 215, and Receive (RX) processing circuitry 220. The gNB102 also includes a controller/processor 225, a memory 230, and a backhaul or network interface 235.
RF transceivers 210a through 210n receive incoming RF signals from antennas 205a through 205n, such as signals transmitted by UEs in network 100. The RF transceivers 210a to 210n down-convert the input RF signals to generate IF signals or baseband signals. The IF signal or baseband signal is sent to RX processing circuitry 220, and RX processing circuitry 220 generates a processed baseband signal by filtering, decoding, and/or digitizing the baseband signal or IF signal. RX processing circuit 220 sends the processed baseband signals to controller/processor 225 for further processing.
TX processing circuitry 215 receives analog data or digital data (such as voice data, web data, email, or interactive video game data) from controller/processor 225. TX processing circuitry 215 encodes, multiplexes, and/or digitizes the output baseband data to generate a processed baseband signal or IF signal. RF transceivers 210a through 210n receive the output processed baseband signals or IF signals from TX processing circuitry 215 and upconvert the baseband signals or IF signals to RF signals that are transmitted via antennas 205a through 205 n.
Controller/processor 225 may include one or more processors or other processing devices that control the overall operation of gNB 102. For example, the controller/processor 225 may control the reception of forward channel signals and the transmission of reverse channel signals by the RF transceivers 210 a-210 n, the RX processing circuitry 220, and the TX processing circuitry 215 in accordance with well-known principles. The controller/processor 225 may also support additional functions, such as higher-level wireless communication functions.
For example, the controller/processor 225 may support beamforming operations or directional routing operations, where signals output from the multiple antennas 205 a-205 n are weighted differently to effectively steer the output signals in a desired direction. Controller/processor 225 may support any of a variety of other functions in the gNB 102.
Controller/processor 225 is also capable of executing programs and other processes resident in memory 230, such as an OS. Controller/processor 225 may move data into and out of memory 230 as needed to execute processes.
The controller/processor 225 is also coupled to a backhaul or network interface 235. Backhaul or network interface 235 allows the gNB102 to communicate with other devices or systems over a backhaul connection or over a network. Interface 235 may support communication via any suitable wired or wireless connection. For example, when gNB102 is implemented as part of a cellular communication system (such as a 5G, LTE or LTE-a enabled system), interface 235 may allow gNB102 to communicate with other gnbs over wired or wireless backhaul connections. When gNB102 is implemented as an access point, interface 235 may allow gNB102 to communicate with a larger network (such as the internet) through a wired or wireless local area network, or through a wired or wireless connection. Interface 235 includes any suitable structure that supports communication over a wired or wireless connection, such as an ethernet or RF transceiver.
Memory 230 is coupled to controller/processor 225. A portion of memory 230 may include RAM and another portion of memory 230 may include flash memory or other ROM.
Although fig. 2 shows one example of a gNB102, various changes may be made to fig. 2. For example, the gNB102 may include any number of each of the components shown in fig. 2. As a particular example, the access point may include multiple interfaces 235, and the controller/processor 225 may support routing functionality to route data between different network addresses. As another particular example, although shown as including an instance of a single TX processing circuit 215 and an instance of a single RX processing circuit 220, the gNB102 may include multiple instances of TX processing circuits 215 and multiple instances of RX processing circuits 220 (such as one instance per RF transceiver). In addition, various components in FIG. 2 may be combined, further subdivided, or omitted, and additional components may be added according to particular needs.
Fig. 3 illustrates an exemplary UE116 in accordance with an embodiment of the disclosure. The embodiment of UE116 shown in fig. 3 is for illustration only, and UEs 111-115 of fig. 1 may have the same or similar configurations. However, the UE has multiple configurations, and fig. 3 does not limit the scope of the disclosure to any particular implementation of the UE.
As shown in fig. 3, the UE116 includes an antenna 305, a Radio Frequency (RF) transceiver 310, TX processing circuitry 315, a microphone 320, and Receive (RX) processing circuitry 325. The UE116 also includes a speaker 330, a processor 340, an input/output (I/O) Interface (IF)345, a touchscreen 350, a display 355, and a memory 360. Memory 360 includes an Operating System (OS)361 and one or more applications 362.
RF transceiver 310 receives from antenna 305 an incoming RF signal transmitted by the gNB of network 100. The RF transceiver 310 down-converts an input RF signal to generate an Intermediate Frequency (IF) signal or a baseband signal. The IF signal or baseband signal is sent to RX processing circuitry 325, and the RX processing circuitry 325 generates a processed baseband signal by filtering, decoding, and/or digitizing the baseband signal or IF signal. RX processing circuit 325 sends the processed baseband signals to speaker 330 (such as for voice data) or to processor 340 for further processing (such as for web browsing data).
TX processing circuitry 315 receives analog or digital voice data from microphone 320 or other output baseband data (such as web data, email, or interactive video game data) from processor 340. TX processing circuitry 315 encodes, multiplexes, and/or digitizes the output baseband data to generate a processed baseband signal or IF signal. RF transceiver 310 receives the output processed baseband signal or IF signal from TX processing circuitry 315 and upconverts the baseband signal or IF signal to a radio frequency signal, which is transmitted via antenna 305.
The processor 340 may include one or more processors or other processing devices, and executes the OS361 stored in the memory 360 in order to control overall operation of the UE 116. For example, processor 340 may control the reception of forward channel signals and the transmission of reverse channel signals by RF transceiver 310, RX processing circuitry 325, and TX processing circuitry 315 in accordance with well-known principles. In some embodiments, processor 340 includes at least one microprocessor or microcontroller.
Processor 340 is also capable of executing other processes and programs resident in memory 360, such as processes for UL transmission of an uplink channel. Processor 340 may move data into or out of memory 360 as needed to execute processes. In some embodiments, processor 340 is configured to execute applications 362 based on OS361 or in response to signals received from the gNB or an operator. The processor 340 is also coupled to an I/O interface 345, the I/O interface 345 providing the UE116 with the ability to connect to other devices, such as laptop computers and handheld computers. I/O interface 345 is the communication path between these accessories and processor 340.
Processor 340 is also coupled to touch screen 350 and display 355. The operator of the UE116 may input data into the UE116 using the touch screen 350. Display 355 may be a liquid crystal display, light emitting diode display, or other display capable of presenting text and/or at least limited graphics, such as from a website.
The memory 360 is coupled to the processor 340. A portion of memory 360 may include Random Access Memory (RAM), and another portion of memory 360 may include flash memory or other Read Only Memory (ROM).
Although fig. 3 shows one example of UE116, various changes may be made to fig. 3. For example, various components in FIG. 3 may be combined, further subdivided, or omitted, and additional components may be added according to particular needs. As a particular example, processor 340 may be divided into multiple processors, such as one or more Central Processing Units (CPUs) and one or more Graphics Processing Units (GPUs). Further, while fig. 3 shows the UE116 configured as a mobile phone or smartphone, the UE may be configured to operate as other types of mobile or fixed devices.
Fig. 4A is a top level diagram of the transmit path circuitry. For example, the transmit path circuitry may be used for Orthogonal Frequency Division Multiple Access (OFDMA) communications. Fig. 4B is a top level diagram of the receive path circuitry. For example, the receive path circuitry may be used for Orthogonal Frequency Division Multiple Access (OFDMA) communications. In fig. 4A and 4B, for downlink communications, the transmit path circuitry may be implemented in the base station (gNB)102 or a relay station, and the receive path circuitry may be implemented in a user equipment (e.g., user equipment 116 of fig. 1). In other examples, for uplink communications, the receive path circuitry 450 may be implemented in a base station (e.g., the gNB102 of fig. 1) or a relay station, and the transmit path circuitry may be implemented in a user equipment (e.g., the user equipment 116 of fig. 1).
The transmit path circuitry includes a channel coding and modulation block 405, a serial-to-parallel (S-to-P) block 410, an Inverse Fast Fourier Transform (IFFT) block 415 of size N, a parallel-to-serial (P-to-S) block 420, an add cyclic prefix block 425, and an up-converter (UC) 430. Receive path circuitry 450 includes a down-converter (DC)455, a remove cyclic prefix block 460, a serial-to-parallel (S-to-P) block 465, a size-N Fast Fourier Transform (FFT) block 470, a parallel-to-serial (P-to-S) block 475, and a channel decode and demodulation block 480.
At least some of the components in fig. 4a 400 and 4B 450 may be implemented in software, while other components may be implemented in configurable hardware or a combination of software and configurable hardware. In particular, it should be noted that the FFT blocks and IFFT blocks described in the present disclosure document may be implemented as configurable software algorithms, wherein the value of size N may be modified according to embodiments.
Additionally, although the present disclosure relates to embodiments implementing a fast fourier transform and an inverse fast fourier transform, this is merely illustrative and should not be construed as limiting the scope of the present disclosure. It will be appreciated that in alternative embodiments of the present disclosure, the fast fourier transform function and the inverse fast fourier transform function may be readily replaced by a Discrete Fourier Transform (DFT) function and an Inverse Discrete Fourier Transform (IDFT) function, respectively. It is understood that the value of the variable N may be any integer (i.e., 1, 4, 3,4, etc.) for DFT and IDFT functions, and any integer that is a power of 2 (i.e., 1,2,4, 8, 16, etc.) for FFT and IFFT functions.
In transmit path circuitry 400, a channel coding and modulation block 405 receives a set of information bits, applies coding (e.g., LDPC coding) and modulation (e.g., Quadrature Phase Shift Keying (QPSK) or Quadrature Amplitude Modulation (QAM)) to the input bits to produce a sequence of frequency domain modulation symbols. Serial-to-parallel block 410 converts (i.e., demultiplexes) the serial modulation symbols into parallel data to produce N parallel symbol streams, where N is the IFFT/FFT size used in BS 102 and UE 116. An IFFT block 415 of size N then performs an IFFT operation on the N parallel symbol streams to produce a time domain output signal. Parallel-to-serial block 420 converts (i.e., multiplexes) the parallel time-domain output symbols from size-N IFFT block 415 to produce a serial time-domain signal. Add cyclic prefix block 425 then inserts a cyclic prefix to the time domain signal. Finally, an upconverter 430 modulates (i.e., upconverts) the output of add cyclic prefix block 425 to an RF frequency for transmission over a wireless channel. The signal may also be filtered at baseband before it is converted to RF frequency.
The transmitted RF signal reaches UE116 after passing through a radio channel, and performs a reverse operation with respect to the operation at the gNB 102. Downconverter 455 downconverts the received signal to baseband frequency and remove cyclic prefix block 460 removes the cyclic prefix to produce a serial time-domain baseband signal. Serial-to-parallel block 465 converts the time-domain baseband signal to a parallel time-domain signal. An FFT block 470 of size N then performs an FFT algorithm to produce N parallel frequency domain signals. The parallel-to-serial block 475 converts the parallel frequency domain signal into a sequence of modulated data symbols. Channel decode and demodulation block 480 demodulates and decodes the modulated symbols to recover the original input data stream.
Each of the gnbs 101 to 103 may implement a transmission path similar to transmission to the user equipment 111 to the user equipment 116 in the downlink, and may implement a reception path similar to reception from the user equipment 111 to the user equipment 116 in the uplink. Similarly, each of user equipment 111 to user equipment 116 may implement a transmit path corresponding to an architecture for transmitting to gNB 101 to gNB 103 in the uplink and may implement a receive path corresponding to an architecture for receiving from gNB 101 to gNB 103 in the downlink.
The use of the 5G communication system has been identified and described. These use cases can be roughly classified into three different groups. In one example, enhanced mobile broadband (eMBB) is determined to meet high bit/second requirements, while the requirements for latency and reliability are less stringent. In another example, the ultra-reliable and low latency (URLL) are determined to be less stringent in bit/second requirements. In yet another example, large-scale machine type communication (mtc) is determined as the number of devices may be as many as 100000 to 1 million/km2But the requirements on reliability/throughput/latency may be less stringent. This situation may also involve power efficiency requirements, as battery consumption may be minimized.
A communication system includes a Downlink (DL) that conveys signals from a transmission point, such as a Base Station (BS) or NodeB, to a User Equipment (UE), and an Uplink (UL) that conveys signals from the UE to a reception point, such as NodeB. A UE (also commonly referred to as a terminal or mobile station) may be fixed or mobile and may be a cellular telephone, a personal computer device, or an autonomous device. An eNodeB, typically a fixed station, may also be referred to as an access point or other equivalent terminology. For LTE systems, the NodeB is often referred to as eNodeB.
In a communication system such as an LTE system, the DL signal may include a data signal conveying information content, a control signal conveying DL Control Information (DCI), and a Reference Signal (RS), also referred to as a pilot signal. The eNodeB transmits data information through a Physical DL Shared Channel (PDSCH). The eNodeB transmits the DCI through a Physical DL Control Channel (PDCCH) or enhanced PDCCH (epdcch).
The eNodeB sends acknowledgement information in response to a data Transport Block (TB) transmission in a physical hybrid ARQ indicator channel (PHICH) from the UE. The eNodeB transmits one or more of a plurality of types of RS including UE common RS (crs), channel state information RS (CSI-RS), or demodulation RS (dmrs). The CRS is sent over the DL system Bandwidth (BW) and may be used by the UE to obtain channel estimates, to demodulate data or control information, or to perform measurements. To reduce CRS overhead, the eNodeB may transmit CSI-RSs with a smaller time and/or frequency domain density than CRS. DMRS may be transmitted only in BW of a corresponding PDSCH or EPDCCH, and a UE may demodulate data or control information in the PDSCH or EPDCCH, respectively, using DMRS. The transmission time interval for the DL channel is referred to as a subframe and may have a duration of, for example, 1 millisecond.
The DL signal also includes the transmission of logical channels carrying system control information. When DL signals carry a Master Information Block (MIB), the BCCH is mapped to a transport channel called Broadcast Channel (BCH); or the BCCH is mapped to a DL shared channel (DL-SCH) when a DL signal transmits a System Information Block (SIB). Most of the system information is included in different SIBs transmitted using the DL-SCH. The presence of system information on the DL-SCH in a subframe may be indicated by transmission of a corresponding PDCCH (transmitting a codeword for transmitting a Cyclic Redundancy Check (CRC) scrambled by system information RNTI (SI-RNTI)). Alternatively, the scheduling information for SIB transmission may be provided in an earlier SIB, and the scheduling information for the first SIB (SIB-1) may be provided by the MIB.
DL resource allocation is performed in units of subframes and Physical Resource Block (PRB) groups. The transmission BW includes frequency resource units called Resource Blocks (RBs). Each RB comprisesSubcarriers or Resource Elements (REs), such as 12 REs. One RB unit on one subframe is called a PRB. The UE may be allocated a total BW for PDSCH transmissionM of REPDSCHAnd one RB.
The UL signal may include a data signal transmitting data information, a control signal transmitting UL Control Information (UCI), and a UL RS. UL RSs include DMRSs and sounding RSs (srs). The UE transmits the DMRS only in the BW of the corresponding PUSCH or PUCCH. The eNodeB may demodulate a data signal or a UCI signal using the DMRS. The UE sends SRS to provide UL CSI to the eNodeB. The UEs transmit data information or UCI through respective Physical UL Shared Channels (PUSCHs) or Physical UL Control Channels (PUCCHs). If the UE needs to send data information and UCI in the same UL subframe, the UE may multiplex both in the PUSCH. The UCI comprises: hybrid automatic repeat request acknowledgement (HARQ-ACK) information indicating correct (ACK) or incorrect (NACK) detection of data TBs in PDSCH or absence of PDCCH Detection (DTX); a scheduling request indicating whether the UE has data in a buffer of the UE; a Rank Indicator (RI); and Channel State Information (CSI) for enabling the eNodeB to perform link adaptation for PDSCH transmission to the UE. The HARQ-ACK information is also sent by the UE in response to detection of PDCCH/EPDCCH indicating release of the semi-persistently scheduled PDSCH.
The UL subframe includes two slots. Each time slot including means for transmitting data informationIndividual symbols, UCI, DMRS, or SRS. The frequency resource unit of the UL system BW is an RB. Allocating total BW for transmission for UEN of RERBAnd one RB. For PUCCH, NRB1. The last subframe symbol may be used to multiplex SRS transmissions from one or more UEs. The number of subframe symbols available for data/UCI/DMRS transmission isWherein if the last subframe symbol is used for transmitting the SRSOtherwise NSRS＝0。
Fig. 5 shows an example of a transmitter block diagram 500 for PDSCH in a subframe according to an embodiment of the present disclosure. The embodiment of the transmitter block diagram 500 shown in fig. 5 is for illustration only. Fig. 5 does not limit the scope of the present disclosure to any particular embodiment of block diagram 500.
As shown in fig. 5, information bits 510 are encoded by an encoder 520, such as a turbo encoder, and modulated (e.g., using Quadrature Phase Shift Keying (QPSK) modulation) by a modulator 530. Serial-to-parallel (S/P) converter 540 produces M modulation symbols which are then provided to mapper 550 for mapping to REs selected by transmission BW selection unit 555 for an assigned PDSCH transmission BW, unit 560 applies an Inverse Fast Fourier Transform (IFFT), and the output is then serialized by parallel-to-serial (P/S) converter 570 to generate a time domain signal, filtered by filter 580, and thereby obtain transmitted signal 590. Additional functions, such as data scrambling, cyclic prefix insertion, time windowing, interleaving, and other functions are well known in the art and are not shown for the sake of brevity.
Fig. 6 shows a receiver block diagram 600 for PDSCH in a subframe according to an embodiment of the disclosure. The embodiment of diagram 600 shown in fig. 6 is for illustration only. Fig. 6 does not limit the scope of the present disclosure to any particular embodiment of diagram 600.
As shown in fig. 6, received signal 610 is filtered by filter 620, RE 630 for allocated received BW is selected by BW selector 635, unit 640 applies Fast Fourier Transform (FFT), and the output is serialized by parallel-to-serial converter 650. Demodulator 660 then coherently demodulates the data symbols by applying channel estimates obtained from DMRS or CRS (not shown), and decoder 670 (such as a turbo decoder) decodes the demodulated data to provide estimates of information data bits 680. For simplicity, additional functions such as time windowing, cyclic prefix removal, descrambling, channel estimation, and deinterleaving are not shown.
Fig. 7 shows a transmitter block diagram 700 for PUSCH in a subframe according to an embodiment of the present disclosure. The embodiment of block diagram 700 shown in fig. 7 is for illustration only. Fig. 7 does not limit the scope of the present disclosure to any particular embodiment of diagram 700.
As shown in fig. 7, information data bits 710 are encoded by an encoder 720, such as a turbo encoder, and modulated by a modulator 730. A Discrete Fourier Transform (DFT) unit 740 applies DFT to the modulated data bits, REs 750 corresponding to the allocated PUSCH transmission BW are selected by a transmission BW selection unit 755, IFFT is applied by a unit 760, and after cyclic prefix insertion (not shown), filtering is applied by a filter 770, thereby obtaining a transmitted signal 780.
Fig. 8 shows a receiver block diagram 800 for PUSCH in a subframe according to an embodiment of the present disclosure. The embodiment of block diagram 800 shown in FIG. 8 is for illustration only. Fig. 8 does not limit the scope of the present disclosure to any particular embodiment of diagram 800.
As shown in fig. 8, received signal 810 is filtered by filter 820. Subsequently, after removing the cyclic prefix (not shown), unit 830 applies an FFT, REs 840 corresponding to the allocated PUSCH reception BW are selected by reception BW selector 845, unit 850 applies an inverse dft (idft), demodulator 860 coherently demodulates the data symbols by applying channel estimates obtained from DMRS (not shown), and decoder 870, such as a turbo decoder, decodes the demodulated data to provide estimates of the information data bits 880.
In next generation cellular systems, various use cases beyond the capabilities of LTE systems are envisioned. There is a need for a system (referred to as a 5G or fifth generation cellular system) that is capable of operating below 6GHz and above 6GHz (e.g., in the mmWave regime). In the 3GPP TR 22.891, the data is,745G use cases have been identified and described; these use cases can be roughly classified into three different groups. The first group is called "enhanced mobile broadband (eMBB)" and aims at high data rate services with less stringent latency and reliability requirements. The second group is called "ultra-reliable and low latency" (URLL), targeted for applications with less stringent data rate requirements but low tolerance to latency. The third group is called "large-scale machine type communication (mtc)", with the goal of a large number of low power device connections (such as one million/km)2) It has less stringent reliability, data rate and latency requirements.
In order for a 5G network to support such diverse services with different quality of service (QoS), a method called network slicing has been identified in the 3GPP specifications. To efficiently utilize PHY resources and multiplex various slices (with different resource allocation schemes, mathematical architectures, and scheduling strategies) in the DL-SCH, a flexible and independent frame or subframe design is utilized.
Fig. 9 illustrates an exemplary multiplexing of two slices 900 according to an embodiment of the disclosure. The embodiment of the multiplexing of two slices 900 shown in fig. 9 is for illustration only. Fig. 9 does not limit the scope of the present disclosure to any particular embodiment of multiplexing of two slices 900.
Two exemplary examples of multiplexing two slices in a common subframe or frame are depicted in fig. 9. In these example embodiments, a slice may consist of one or two transmission examples, where one transmission example includes a Control (CTRL) component (e.g., 920a, 960b, 920b, or 960c) and a data component (e.g., 930a, 970b, 930b, or 970 c). In embodiment 910, two slices are multiplexed in the frequency domain, while in embodiment 950, two slices are multiplexed in the time domain. The two slices may be sent with different mathematical sets.
The 3GPP NR specification supports up to 32 CSI-RS antenna ports, enabling the gNB to be equipped with a large number of antenna elements (such as 64 or 128). In this case, a plurality of antenna elements are mapped onto one CSI-RS port. For next generation cellular systems, such as 5G, the maximum number of CSI-RS ports may remain the same or increase.
Fig. 10 illustrates an exemplary antenna block 1000 in accordance with an embodiment of the present disclosure. The embodiment of the antenna block 1000 shown in fig. 10 is for illustration only. Fig. 10 does not limit the scope of the present disclosure to any particular embodiment of the antenna block 1000.
For the millimeter wave (mmWave) band, although the number of antenna elements may be larger for a given form factor, the number of CSI-RS ports that may correspond to the number of digital precoding ports tends to be limited due to hardware constraints, such as the feasibility of installing a large number of ADCs/DACs at mmWave frequencies, as shown in fig. 10. In this case, one CSI-RS port is mapped onto a large number of antenna elements that can be controlled by a set of analog phase shifters. One CSI-RS port may then correspond to a sub-array that produces a narrow analog beam by analog beamforming. The analog beam can be configured to scan over a wider range of angles by varying the set of phase shifters across symbols or sub-frames. Number of sub-arrays (equal to number of RF chains) and CSI-RS port NCSI-PORTThe number of (2) is the same. Digital beam forming unit in NCSI-PORTLinear combining is performed on the analog beams to further increase the precoding gain. Although the analog beams are wideband (and thus not frequency selective), the digital precoding may vary across frequency sub-bands or resource blocks.
Although the following exemplary description and embodiments assume Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA), the present disclosure may be extended to other OFDM-based transmission waveforms or multiple access schemes, such as filtered OFDM (F-OFDM).
Fig. 11 illustrates an example network configuration 1100 according to an embodiment of this disclosure. The embodiment of the network configuration 1100 shown in fig. 11 is for illustration only. Fig. 11 does not limit the scope of the present disclosure to any particular implementation of configuration 1100.
In order for 5G networks to support such diverse services with different quality of service (QoS), a scheme, called network slicing, has been identified in the 3GPP specifications.
As shown in fig. 11, the operator's network 1110 includes a plurality of radio access networks 1120 (RANs) associated with network devices such as GNBSs 1130a and 1130b, small cell base stations (femto/pico GNBSs or Wi-Fi access points) 1135a and 1135b, and the like. The network 1110 may support a variety of services, each represented as a fragment.
In this example, the URLL slice 1140a serves UEs that require URLL services, such as car 1145b, truck 1145c, smart watch 1145a, and smart glasses 1145 d. Two mtc slices 1150a and 550b serve UEs requiring mtc services, such as a power meter 555b and a temperature control box 1155 b. One eMBB slice 1160A serves UEs that require eMBB services, such as a cellular phone 1165a, a laptop computer 1165b, and a tablet 1165 c. A device configured with two slices is also envisaged.
To implement digital precoding, efficient design of CSI-RS is a crucial factor. For this purpose, three types of CSI reporting mechanisms are supported corresponding to three types of CSI-RS measurement behavior, e.g. "CLASS a" CSI report corresponding to non-precoded CSI-RS, a "CLASS B" report corresponding to K ═ 1CSI-RS resources of UE-specific beamformed CSI-RS and a "CLASS B" report corresponding to K >1CSI-RS resources of cell-specific beamformed CSI-RS.
For non-precoded (NP) CSI-RS, cell-specific one-to-one mapping between CSI-RS ports and TxRUs is utilized. Different CSI-RS ports have the same wide beam width and direction and therefore typically have cell-width coverage. For beamformed CSI-RS, cell-or UE-specific beamforming operations are applied on non-zero power (NZP) CSI-RS resources (e.g., including multiple ports). At least at a given time/frequency, the CSI-RS ports have a narrow beamwidth and thus have no cell-width coverage, at least from the perspective of the gNB. At least some of the CSI-RS port-resource combinations have different beam directions.
In case DL long term channel statistics can be measured by UL signals at the serving eNodeB, the UE specific BF CSI-RS can be easily used. This is generally feasible when the UL-DL duplex distance is sufficiently small. However, when this condition is not true, some UE feedback is needed for the eNodeB to obtain an estimate of the DL long-term channel statistics (or any representation thereof). To facilitate this process, a first BF CSI-RS having a transmission period of T1(ms) and a second NP CSI-RS having a transmission period of T2(ms) are transmitted, where T1 ≦ T2. This method is called hybrid CSI-RS. The implementation of hybrid CSI-RS depends to a large extent on the definition of CSI processes and NZP CSI-RS resources.
In the 3GPP LTE specification, a codebook-based transmission scheme is used to support UL SU-MIMO transmission. That is, the UL grant (containing DCI format 4) includes a single PMI field (along with the RI) that indicates a single precoding vector or matrix (from a predefined codebook) that the UE will use for the scheduled UL transmission. Thus, when multiple PRBs are allocated to a UE, a single precoding matrix indicated by the PMI means that wideband UL precoding is utilized.
Despite its simplicity, this is clearly sub-optimal, since a typical UL channel is frequency selective, and a UE is frequency scheduled to transmit using multiple PRBs. Another drawback of LTE UL SU-MIMO is that it does not support the case where accurate UL-CSI cannot be obtained at the eNB (which is necessary for proper operation codebook-based transmission). This situation may occur in case of UEs with high mobility or in case of bursty inter-cell interference in cells with poor isolation.
Therefore, new components need to be designed to enable more efficient support for UL MIMO for the following reasons. First, frequency selective (or subband) precoding to support UL MIMO is needed whenever possible. Second, UL MIMO should provide competitive performance even when accurate UL-CSI is not available at the eNB. Third, the proposed UL MIMO solution should be able to exploit UL-DL reciprocity where the UE utilizes CSI-RS to provide UL-CSI estimation for TDD scenarios. Other examples of such effective UL MIMO operations and components are described in united states patent application No. 15/491,927 entitled "Method and Apparatus for Enabling Uplink MIMO" filed on 19/4/2017, which is hereby incorporated by reference in its entirety.
In the 3GPP LTE UL codebook, precoders with antenna selection have been supported in order to keep the peak-to-average power ratio (PAPR) low and the Cubic Metric (CM) small for classes > 1. Antenna selection provides performance improvement in certain situations, especially for the SC-FDMA based UL in LTE. However, for the 5G NR system, it has been agreed in 3GPP RAN1 that the UL will be primarily CP-OFDM based, although SC-FDMA based will also be supported. It is not clear that in the case of CP-OFDM based UL, the antenna selection will show any performance gain. Whether or not antenna selection is considered, there are several alternatives for the UL codebook in the 5G NR. Furthermore, the UL codebook design also depends on whether the UE is able to transmit UL data (PUSCH) using all antenna ports or a subset of antenna ports. For example, the UE can perform at least one of fully coherent (all antenna ports), partially coherent (subset of antenna ports), or non-coherent UL transmission (single antenna port) to send layers in the UL. The 5G NR UL codebook has been designed to keep in mind this UE coherence capability. However, if UL power control similar to LTE is applied, there are some problems related to UL power control (as explained later). The present disclosure is directed to several exemplary embodiments for UL power control to overcome these problems.
In the 3GPP NR specification, UL transmission is configured as codebook-based or non-codebook-based via setting of a higher layer parameter txConfig in PUSCH-Config (PUSCH configuration) to "codebook" or "non-codebook".
According to the 3GPP NR specification, the following for codebook based UL transmission is supported. For codebook-based transmission, the UE determines a codebook subset of the UE based on TPMI and upon receiving a higher layer parameter UL codebook subset or codebook subset in PUSCH-Config, which may configure "full and partial and Non-Coherent" or "Non-Coherent" depending on the UE capabilities. The maximum transmission rank may be configured by a higher parameter ULmaxRank (UL maximum rank) or maxRank (maximum rank) in PUSCH-Config.
A UE reporting UE capability of a UE's "partial anti dnoncode" transmission may not be expected to be configured by a ul codebooksubbset with "full anti partial anti dnoncode".
A UE reporting UE capability for UE "Non-code" transmissions may not be expected to be configured by ul codebooksubset with "fullla and partial anti dnoncode" or with "partial anti dnoncode".
When configuring two antenna ports, the UE may not desire to be configured with a higher layer parameter ulcoboksubframe set to "partial anti dnoncode".
In the present disclosure, "fullAndParalAndNanCoherent", "ParalAndNanCoherent". And "Non-Coherent" is referred to as three examples of coherence type/capability, where the term "Coherent" means a subset of antenna ports at the UE that can be used to coherently transmit the UL data layer.
According to the 3GPP NR specification, the precoding matrix W is equal to the identity matrix for non-codebook based UL transmission. For codebook-based UL transmission, the precoding matrix W is given by W for single layer transmission on a single antenna port or by tables 1 to 6.
The subsets of TPMI indices for the three coherence types are summarized in tables 7 and 8, where the rank r corresponds to (and is equivalent to) r layers.
The rank (or number of layers) and corresponding precoding matrix W are indicated to the UE using TRI and TPMI, respectively. In one example, the indication is joined via the fields "precoding information and number of layers" in the DCI (e.g., using DCI format 0_ 1). In another example, the indication is via higher layer RRC signaling. In one example, the mapping between the fields "precoding information and number of layers" and TRI/TPMI is according to NR.
TABLE 1 precoding matrix W for single layer transmission using two antenna ports
TABLE 2 precoding matrix W with disabled transform precoding for single layer transmission using four antenna ports
TABLE 3 precoding matrix W with disabled transform precoding for two-layer transmission using two antenna ports
TABLE 4 precoding matrix W with disabled transform precoding for two-layer transmission using four antenna ports
TABLE 5 precoding matrix W with disabled transform precoding for three-layer transmission using four antenna ports
TABLE 6 precoding matrix W with disabled transform precoding for four-layer transmission using four antenna ports
TABLE 7 TPMI indices for two antenna ports
Grade
Non-Coherent
fullAndPartialAndNonCoherent
1
0-1
0-5
2
0
0-2
TABLE 8 TPMI index for 4 antenna ports
TABLE 9 Total Power of the antenna port precoding matrix W for the same two antenna ports
TABLE 10 Total Power for 4 antenna Port precoding matrix W
The total power of the precoding matrix W for different levels and coherence types is summarized in table 9 and table 10. The following power-related problems may be observed.
In one problem, for both incoherent and partially coherent TPMI, the total power increases with increasing levels, which means that TPMI selection will be biased towards higher levels. In particular, even for cell-edge UEs, class 1TPMI may not be selected, which may severely impact cell-edge performance.
In another problem, for a given level, the total power of the incoherent TPMI is less than the total power of the partially coherent TPMI is less than the total power of the fully coherent TPMI. The reason for this trend is that the power of the non-zero antenna port does not change over the three types of TPMI. This may be beneficial in certain situations, e.g., the UE is enabled for power saving. However, this may not always be desirable.
The above problems may be handled by TPMI or TPMI group signaling from the UE (as part of the UE capability signaling) indicating that the UE can implement a full power TPMI or TPMI group in the UL transmission.
The above problem may also be addressed by virtualizing (combining) multiple transmit (Tx) chains (or antenna ports), e.g., a UE may virtualize a Tx chain when the UE is configured with SRS resources having fewer ports than the number of Tx chains.
In one embodiment 1, the UE reports via UE capability signaling whether it is capable of full power UL transmission for codebook-based UL transmission. The UE may or may not report additional details regarding UE capability signaling. When the UE reports additional details regarding UE capability signaling, then the additional details include B-bit signaling, where B-bit signaling S ═ B0...bB-1The TPMI or TPMI group is indicated (reported) that can be used to send UL transmissions at full power. In one example, each bit biAssociated with a TPMI or TPMI group in a UL codebook of rank 1, i.e. the B-bit signaling is a bitmap (let us denote the number of Z) of size (or length) equal to the total number of TPMI or TPMI groups, which the UE can utilize to support full power UL transmission. In another example of the above-described method,and S ═ b0...bB-1Indicating (reporting) Z TPMI or TPMI groups for full power UL transmission, whereinIs a ceiling function that maps a number x to the nearest integer y that is greater than (or greater than) x (i.e., y ≧ x).
In one example, a TPMI group is defined as in a level 1 UL codebookGroup (set) of TPMI, the level 1 UL codebook corresponds to a precoding matrix with zero and non-zero entries at the same position. In this example, each bit biAssociated with a length N vector comprising "0" and "1", where N is the number of antenna ports at the UE, e.g., N. N is an element of {2,4}
In another example, a TPMI group is defined as a group (set) of TPMIs in a level 1L codebook that corresponds to one or more consecutive TPMIs, i.e., TPMI(s) a, a + 1. At least one of the following examples may be used.
In one example Ex 1-1: a-0 is fixed and K-N-1 is fixed, where N is the number of antenna ports at the UE.
In one example Ex 1-2: a-0 is fixed and K-N is fixed, where N is the number of antenna ports at the UE.
In one example Ex 1-3: except when N ═ 4, the same as Ex 1-1.
In one example Ex 1-4: except when N ═ 4, the same as Ex 1-2.
In one example Ex 1-5: except when N ═ 4 and non-coherent (NC) UEs, the same as Ex 1-1.
In one example Ex 1-6: except when N ═ 4 and NC UE, same as Ex 1-2.
In one example Ex 1-7: a is 0 and K is the higher layer of the configuration.
In one example Ex 1-8: both a and K are higher layer configurations.
In another example, a TPMI group is defined as a TPMI group (set) in a level 1 UL codebook corresponding to one or more TPMIs, where the number (Z) of such TPMI groups is fixed. In one example, Z is fixed (e.g., fixed to 2) regardless of the number of antenna ports (N) at the UE. In another example, Z is fixed according to the value of N, e.g., Z ═ N or for N ═ 2, Z ═ 2; or for N-4, Z-4 or 6.
At least one of the following alternatives is used for the B-bit indication.
In one alternative Alt 1-1, B-2 and for 2 and 4 antenna ports at the UE (2Tx and 4Tx) B-4, and the B-bit signaling indicates the TPMI or TPMI group including the vector from group (G), as shown in table 11.
Table 11: UE capability reporting
In one alternative Alt 1-2, B-2 and for 2 and 4 antenna ports at the UE B-6, and the B-bit signaling indicates the TPMI or TPMI group that includes the vector from group (G), as shown in table 12.
Table 12: UE capability reporting
In one alternative Alt 1-3, B-2 and for 2 and 4 antenna ports at the UE B-4, and the B-bit signaling indicates the TPMI or TPMI group that includes the vector from group (G), as shown in table 13. In this alternative, the additional capability signaling is only reported when the UE is non-coherent (NC) or Partially Coherent (PC).
Table 13: UE capability reporting
In one alternative Alt 1-4, B-2 and for 2 and 4 antenna ports at the UE B-6, and the B-bit signaling indicates the TPMI or TPMI group that includes the vector from group (G), as shown in table 14. In this alternative, the additional capability signaling is only reported when the UE is non-coherent (NC) or Partially Coherent (PC).
Table 14: UE capability reporting
In one alternative Alt 1-5, 2 for 2 antenna ports B at the UE,4 for 4 antenna ports B at the NC UE and 6 for 4 antenna ports B at the PC UE. The B-bit signaling indicates the TPMI or TPMI group including vectors from group (G), as shown in table 15. In this alternative, the additional capability signaling is only reported when the UE is non-coherent (NC) or Partially Coherent (PC).
Table 15: UE capability reporting
In one alternative Alt 1-6, for 2 antenna ports Z-2 at the UE, B-1, and a vector comprising TPMI or TPMI groups is shown in table 16, where several exemplary sub-alternatives are shown.
Table 16: UE capability reporting
In one alternative Alt 1-7, for 4 antenna ports at the UE, Z-2, B-1, and a vector comprising TPMI or TPMI groups is shown in table 17, where several exemplary sub-alternatives are shown.
Table 17: UE capability reporting
In one alternative Alt 1-8, the vector comprising TPMI or TPMI groups for 4 antenna ports Z-3 and B-2 at the UE is shown in table 18, where several exemplary sub-alternatives are shown.
Table 18: UE capability reporting
In one alternative Alt 1-9, for 4 antenna ports Z-4 at the UE, B-2, and a vector comprising TPMI or TPMI groups is shown in table 19, where several exemplary sub-alternatives are shown.
Table 19: UE capability reporting
In one alternative Alt 1-10, the vector comprising TPMI or TPMI groups for 4 antenna ports B-3 at the UE is shown in table 20, where several exemplary sub-alternatives are shown.
Table 20: UE capability reporting
S＝b0b1b2
Alt 1-10-1
Alt 1-10-2
Alt 1-10-3
Alt 1-10-4
000
{TPMI＝0}
{TPMI＝0}
{TPMI＝0}
{TPMI＝0}
001
{TPMI＝1}
{TPMI＝1}
{TPMI＝1}
{TPMI＝1}
010
{TPMI＝2}
{TPMI＝2}
{TPMI＝2}
{TPMI＝2}
011
{TPMI＝3}
{TPMI＝3}
{TPMI＝3}
{TPMI＝3}
100
{TPMI＝0,1}
{TPMI＝0,2}
{TPMI＝0,1}
{TPMI＝0,2}
101
{TPMI＝0,1,2}
{TPMI＝1,3}
{TPMI＝0,1,2}
{TPMI＝1,3}
110
Retention
Retention
{TPMI＝0,1,2,3}
{TPMI＝0,1,2,3}
111
Retention
Retention
Retention
Retention
In one example, for a 2Tx UE, one of the above alternatives (e.g., Alt 1-1 to Alt 1-6) is used only when the UE is non-coherent (NC) (i.e., when the UE reports non-coherence in its UE capabilities). In another example, for a 2Tx UE, one of the above alternatives (e.g., Alt 1-1 to Alt 1-6) is used, regardless of whether the UE is non-coherent or fully coherent (i.e., when the UE reports UE capabilities of nocobent or fullCoherent or fullanddpartial and nocobernent) in its UE capabilities.
In one example, for a 4Tx UE, one of the above alternatives (e.g., Alt 1-1 through Alt 1-10) is used only when the UE is non-coherent (NC) (i.e., when the UE reports non-coherent in its UE capabilities). In another example, for a 2Tx UE, one of the above alternatives (e.g., Alt 1-1 to Alt 1-10) is used, regardless of whether the UE is non-coherent or partially coherent or fully coherent (i.e., when the UE reports a non-coherent or partial coherent or fullcalorine or fullcandaldpartialandnconiherent in its UE capabilities).
In one example, for a 4Tx partially coherent UE, one of the above alternatives (e.g., Alt 1-1 through Alt 1-10) or one of the following alternatives (e.g., Alt 1-11 through Alt 1-14) is used.
In one alternative Alt 1-11, for 4 antenna ports at the UE, Z-2, B-1, and a vector comprising TPMI or TPMI groups is shown in table 21, where several exemplary sub-alternatives are shown.
Table 21: UE capability reporting for TPMI/TPMI groups
In one alternative Alt 1-12, Z-3 and B-2 for 4 antenna ports at the UE, and a vector comprising TPMI or TPMI groups is shown in table 22, where several exemplary sub-alternatives are shown.
Table 22: UE capability reporting for TPMI/TPMI groups
In Alt 1-13, for 4 antenna ports Z-4 at the UE, B-2, and vectors comprising TPMI or TPMI groups are shown in table 23, where several exemplary sub-alternatives are shown.
Table 23: UE capability reporting for TPMI/TPMI groups
In one alternative Alt 1-14, the vector comprising TPMI or TPMI groups for 4 antenna ports B-3 at the UE is shown in table 24, where several exemplary sub-alternatives are shown.
Table 24: UE capability reporting for TPMI/TPMI groups
In one embodiment 2, the UE reports via UE capability signaling whether it is capable of full power UL transmission for codebook-based UL transmission. The UE may or may not report additional details regarding UE capability signaling. When the UE reports additional details regarding UE capability signaling, then the additional details include B-bit signaling, where B-bit signaling S ═ B0...bB-1The TPMI or TPMI group is indicated (reported) that can be used to send UL transmissions at full power. In one example, each bit biAssociated with a TPMI or TPMI group in the UL codebook. In one example, a TPMI group is defined as a group (set) of TPMI in a UL codebook corresponding to a precoding matrix with zero and non-zero entries at the same position. In this example, each bit biAssociated with a length N vector or matrix comprising '0' and '1', where N is the number of antenna ports at the UE, e.g., N ∈ {2,4 }.
For antenna port N-2, B-2 and TPMI/TPMI groups are according to embodiment 1. For antenna port N-4, at least one of the following alternatives is used for B-bit indication.
In an alternative Alt 2-1, the B-bit signaling indicates a TPMI or TPMI group comprising a (level 1) vector or a (level 2) matrix from group G ═ G1, G2, where the B values and groups G1 and G2 are according to at least one of table 25, table 26, and table 27.
Table 25: 4Tx UE capability reporting
Table 26: 4Tx UE capability reporting
Table 27: 4Tx UE capability reporting
In an alternative Alt 2-2, the B-bit signaling indicates a TPMI or TPMI group comprising a (level 1) vector or a (level 2) matrix from group G ═ G1, G2, where the B values and groups G1 and G2 are according to at least one of table 28, table 29, and table 30.
Table 28: 4Tx UE capability reporting
Table 29: 4Tx UE capability reporting
Table 30: 4Tx UE capability reporting
In an alternative Alt 2-3, the B-bit signaling indicates a TPMI or TPMI group comprising a (level 1) vector or a (level 2) matrix from group G ═ G1, G2, where the B values and groups G1 and G2 are according to at least one of table 31, table 32, and table 33. In this alternative, the additional capability signaling is only reported when the UE is non-coherent (NC) or Partially Coherent (PC).
Table 31: 4Tx UE capability reporting
Table 32: 4Tx UE capability reporting
Table 33: 4Tx UE capability reporting
In an alternative Alt 2-4, the B-bit signaling indicates a TPMI or TPMI group comprising a (level 1) vector or a (level 2 or 3) matrix from group G ═ G (G1, G2, G3), where value B and groups G1, G2, and G3 are according to at least one of table 34, table 35, and table 36.
Table 34: 4Tx UE capability reporting
Table 35: 4Tx UE capability reporting
Table 36: 4Tx UE capability reporting
In an alternative Alt 2-5, the B-bit signaling indicates a TPMI or TPMI group comprising a (level 1) vector or a (level 2 or 3) matrix from group G ═ G (G1, G2, G3), where value B and groups G1, G2, and G3 are according to at least one of table 37, table 38, and table 39.
Table 37: 4Tx UE capability reporting
Table 38: 4Tx UE capability reporting
Table 39: 4Tx UE capability reporting
In one alternative Alt 2-6, the B-bit signaling indicates a TPMI or TPMI group including a (level 1) vector or a (level 2 or 3) matrix from the group G ═ (G1, G2, G3), wherein when the codebook subset is partial anti-dnoncoherent, the B values and the groups G1, G2, and G3 are according to at least one of table 37, table 38, and table 39, and when the codebook subset is non-coherent, the B values and the groups G1, G2, and G3 are according to at least one of table 34, table 35, and table 36.
In one example, embodiments 1 and 2 and alternatives and examples therein may also be applied to TPMI or TPMI groups comprising (level 1) vectors or (level 2 or 3) matrices from group G ═ G (G1, G2, G3), where the scaling of the vectors or matrices is different from the scaling of the vectors or matrices in embodiments 1 and 2. For example, the scaling of the vector or matrix may be for 4 antenna portsAnd for 2 antenna ports are
In one embodiment 3, the UE reports via UE capability signaling (e.g., UL full power model 2) whether it is capable of full power UL transmission for codebook-based UL transmission. The UE may or may not report additional details regarding UE capability signaling, i.e., any additional details (e.g., TPMI or TPMI group signaling) are compliant with the UE capabilities, i.e., it may be UE optional features. When the UE reports additional details regarding UE capability signaling, then the additional details include B-bit signaling, where B-bit signaling S ═ B0...bB-1The TPMI or TPMI group that can be used to send UL transmissions at full power is indicated (reported).
In an alternative Alt 3-1, for N-4 antenna ports, the number of bits (B) of the TPMI/TPMI group that can deliver UL full power is indicated, B-2 for non-coherent UEs and B-3 for partially coherent UEs. For non-coherent UEs, the mapping of the 2-bit indication to TPMI groups is shown in table 40, where the TPMI groups are defined in table 42. For a partially coherent UE, the mapping of the 3-bit indication to the TPMI groups is shown in table 41, where the TPMI groups are defined in table 42, and two alternatives for exact mapping (Alt a and Alt B) are shown.
Fig. 12 shows an example of a TPMI packet 1200 based on Power Amplifier (PA) power values according to an embodiment of the present disclosure. The embodiment of TPMI packet 1200 shown in fig. 12 is for illustration only. Fig. 12 does not limit the scope of the present disclosure to any particular implementation of TPMI packet 1200.
Table 40: mapping of 2-bit indication to TPMI or TPMI packets for non-coherent UEs with 4 antenna ports
S＝b0b1Or b1b0
TPMI or TPMI groups
00
G0
01
G1
10
G2
11
G3
Table 41: mapping of 3-bit indication to TPMI or TPMI packets for partially coherent UEs with 4 antenna ports
Table 42: examples of TPMI groups
In Alt 3-2, for an N-4 antenna port, the number of bits (B) of a TPMI/TPMI group that can deliver UL full power is indicated, 2 for non-coherent UEB and 4 for partially coherent UEB. For non-coherent UEs, the mapping of the 2-bit indication to TPMI groups is shown in table 40, where the TPMI groups are defined in table 42. For a partially coherent UE, the mapping of the 4-bit indication to TPMI groups is shown in table 43, where the TPMI groups are defined in table 42, and three alternatives for exact mapping are shown (Alt a, Alt B and Alt C). In Alt a and Alt B, nine states are retained and are not mapped to any other TPMI group. In Alt C, these nine states are mapped to 9 additional TPMI groups. Examples are shown in the table. In one example, in the case of Alt a or Alt B, one of the four bits (e.g., MSBb)0Or b3) For indicating whether the UE reports any TPMI groups, e.g. by setting it to 0(Alt a) or 1(Alt B).
Table 1: mapping of 4-bit indication to TPMI or TPMI packets for partially coherent UEs with 4 antenna ports
In a modification of embodiment 3, grades 1TPMI 0 and TPMI 0,1 for 2 antenna ports are also included in G0, G1, and G2. For example, indicateIs included in G0 and represents grade 1TPMI 0Grade 1TPMI 0,1 of (a) is included in G0 and G1.
Fig. 13 shows an example of a virtualized SRS port 1300 for a UE with two Tx chains, where w is according to an embodiment of the present disclosure0And w1Is the virtualization weight used at both Tx chains. The embodiment of virtualized SRS port 1300 shown in fig. 13 is for illustration only. Fig. 13 does not limit the scope of the present disclosure to any particular implementation of virtualized SRS port 1300.
In one embodiment 4, the UE reports via UE capability signaling whether it is capable of full power UL transmission based on "virtualized" SRS transmission. When the UE is capable of full power UL transmission based on "virtualized" SRS transmission, then the UE is configured with at least one of the following two types of SRS resources (in one SRS resource set or in two different SRS resource sets):
type 1 (non-virtualized or non-precoded): comprises having N1K of SRS port1SRS resource, where N1Equal to the number of Tx chains (or antenna ports) at the UE, where K1≥1
Type 2 (virtualized or pre-coded): comprises having N2K of SRS port2SRS resource, where N2Less than the number of Tx chains (or antenna ports) at the UE, where。K2≥1
For type 1SRS resources, UEs do not virtualize (precode) multiple Tx chains (or antenna ports) before transmitting SRS resources from them. On the other hand, for type 2SRS resources, the UE virtualizes (precodes) multiple Tx chains (or antenna ports) to obtain N before transmitting SRS resources therefrom2An SRS port. The virtualization weights (or precoding vectors) are transparent (unknown at the gNB) or reported to or configured by the UE (e.g., via the TPMI along with SRS configuration). Here, virtualization refers to assigning (using) non-zero weights to multiple Tx chains, and combining the weighted Tx chains to form a single "virtualized" SRS port (or virtualized Tx chain). In one example, for type 2SRS resources, the UE may also be configured with CSI-RS resources (e.g., via an associated CSIRS configuration) to link virtualized SRS resources with CSI-RS resources, where the UE measures the CSI-RS resources to obtain virtualization weights (precoding vectors) to virtualize the respective type 2SRS resources.
In one example N1E {2,4 }. In one example, N21 is fixed. In one example N2E {1,2 }. In one example N2E {1,2,3 }. In one example N2E {1,2,3,4 }. In one example N2E {1,2,4 }. In one example, N2∈{1，..，N1}。
In one example, when K2When the number is more than 1, the number of SRS ports in each type 2SRS resource (N)2) Are the same. In another example, but K2Number of SRS ports (> 1) (N)2) May be different in different type 2SRS resources.
The UE transmits type 1 and/or type 2SRS resources according to the SRS configuration received from the gNB. The gNB measures the corresponding SRS port and calculates the SRI/TPMI, and indicates the calculated SRI/TPMI to the UE (e.g., via DCI or higher layer RRC signaling). The UE uses SRI/TPMI to select SRS resources and corresponding SRS ports (with non-zero power) for ul (pusch) transmission. PUSCH power (via UL power control) factoredScaling, where p0The number of SRS ports with non-zero power, and ρ the number of SRS ports in the SRS resource indicated by the SRI.
Some embodiments as modifications or examples of embodiment 4 are as follows.
In one embodiment 4A, the UE reports via UE capability signaling whether it is capable of full power UL transmission based on "virtualized" SRS transmission. When the UE is capable of full power UL transmission based on "virtualized" SRS transmission, then the UE is configured with only one of the two types of SRS resources (e.g., in one set of SRS resources), i.e., type 1 or type 2, but not both. When the type 1SRS resource is configured, the UE transmits the SRS resource without any virtualization. When the type 2SRS resource is configured, the UE transmits the SRS resource in a virtualized manner (as explained in embodiment 1). The gNB measures the SRS port and indicates to the UE the SRI/TPMI to use for UL transmissions. In one example, the type of SRS is configured via higher layer RRC signaling. In another example, the type of SRS is configured via MAC CE based signaling. In another example, the type of SRS is configured via DCI.
In one embodiment 4B, when the number of Tx chains (or antenna ports) at the UE is 2, then the UE is configured with two types of SRS resources (in one SRS resource set or in two different SRS resource sets):
type 1 (non-virtualized or non-precoded): comprises having N1K for 2SRS ports1SRS resource, where K1≥0
Type 2 (virtualization or precoding): comprises having N2K for 1SRS port2SRS resource, where K2≥0。
K1And K2And greater than 1, i.e., K1＝K20 is not possible. The UE transmits type 1 and/or type 2SRS resources (with or without virtualization as explained in embodiment 1). The gNB measures these SRS resources and indicates the SRI to the UE. When the SRI indicates a type 1SRS resource, it corresponds to level 1 or level 2 (or level 1 to ULmaxRank, where ULmaxRank is RRC configured) transmitted TPMI is also indicated. When SRI indicates type 2SRS resources, then there is no TPMI indication and the selected resources indicate ports for level 1 transmission. At least one of the following examples for K1And K2。
In one embodiment Ex 4B-0: k2＝0，K1＝1
In one example Ex 4B-1: k2＝1，K1＝0
In one example Ex 4B-2: k2＝1，K1＝1
In one embodiment Ex 4B-3: k2＝1，K1≥1
In one embodiment Ex 4B-4: k2＝1，K1＞1
In one example Ex 4B-5: k2≥1，K1＝1
In one example Ex 4B-6: k2＞1，K1＝1
In one example Ex 4B-7: k2≥1，K1≥1
In one example Ex 4B-8: k2＞1，K1≥1
In one embodiment Ex 4B-9: k2≥1，K1＞1
In one embodiment Ex 4B-10: k2＞1，K1＞1
The SRI report is according to at least one of the following alternatives.
In one alternative Alt 4B-0: the joint SRI is used to select: (a) one of two types of SRS resources; (b) SRS resources within the selected type of SRS resource. In one example, this requiresA bit indication.
In one alternative Alt 4B-1: two separate SRIs 1(SRI1, SRI2) are used, where SRI1 is used to select one of two types of SRS resources, and SRI2 is used to indicate the selected type of SRS resourceSRS resources within the source. In one example, the SRI1 requires a 1-bit indication, and if SRI1 indicates a type 1SRS resource, the SRI2 requiresThe bit indicates, and if the SRI1 indicates type 2SRS resources, the SRI2 needs toA bit indication.
Note that when K1＝K2These two alternatives are equivalent when 1, since SRI2 is not indicated (not needed). It is also noted that when K1When the type 1SRS resource is indicated by 1 and SRI1, SRI2 is not indicated. Likewise, when K2When SRI1 indicates type 2SRS resources, SRI2 is not indicated. In one example, the SRI1 is indicated/configured via higher layer RRC signaling. In another example, the SRI1 is indicated/configured via MAC CE based signaling. In another example, SRI1 is indicated/configured via DCI.
In one embodiment 4C, when the number of Tx chains (or antenna ports) at the UE is 2, then the UE is configured with two types of SRS resources (in one SRS resource set or in two different SRS resource sets):
type 1 (non-virtualized or non-precoded): comprises having N1K for 2SRS ports1SRS resource, where K1≥0
Type 2 (virtualization or precoding): comprises having N2K for 1SRS port2SRS resource, where k2≥0
k1And K2Is greater than 1, i.e., K1＝K20 is not possible. The UE transmits type 1 and/or type 2SRS resources (with or without virtualization as explained in embodiment 1). The gNB measures these SRS resources and indicates the SRI to the UE. When the SRI indicates a type 1SRS resource, a TPMI corresponding to a level 1 or level 2 transmission is also indicated. When SRI indicates type 2SRS, then there is no TPMI indication and SRI either selects to indicate the port for level 1 transmissionOr two SRS resources indicating two ports for level 2 transmission (assuming unitary precoding, i.e., 1 layer per port). At least one of examples (4B-0 to 4B-10) for K1And K2. The SRI report is according to at least one of the following alternatives.
In one alternative Alt 4C-0: the joint SRI is used to select: (a) type 1SRS resource: (b) a single type 2SRS resource; (c) two type 2SRS resources. In one example, this requiresA bit indication.
In one alternative Alt 4C-1: two separate SRIs 1(SRI1, SRI2) are used, where SRI1 is used to select one of the two types of SRS resources and SRI2 is used to indicate the SRS resources within the selected type of SRS resource. In one example, the SRI1 requires a 1-bit indication, and if SRI1 indicates a type 1SRS resource, the SRI2 requiresThe bit indicates, and if the SRI1 indicates type 2SRS resources, the SRI2 needs toA bit indication.
Note that when K1＝K2These two alternatives are equivalent when 1, since SRI2 is not indicated (not needed). Note also that when K1When the SRI1 indicates the type 1SRS resource, the SRI2 is not indicated. Likewise, when K2When SRI1 indicates type 2SRS resources, SRI2 is not indicated. In one example, the SRI1 is indicated/configured via higher layer RRC signaling. In another example, the SRI1 is indicated/configured via MAC CE based signaling. In another example, SRI1 is indicated/configured via DCI.
In one embodiment 4D, when the number of Tx chains (or antenna ports) at the UE is 2, then the UE is configured with two types of SRS resources (in one SRS resource set or in two different SRS resource sets):
type 1 (non-virtualized or non-precoded): comprises having N1K for 2SRS port1SRS resource, where K1≥0
Type 2 (virtualization or precoding): comprises having N2K for 1SRS port2SRS resource, where K2≥0
K1And K2At least one being greater than 1, i.e. K1＝K20 is not possible. The UE transmits type 1 and/or type 2SRS resources (with or without virtualization as explained in embodiment 1). The gNB measures these SRS resources and indicates the SRI to the UE. When the SRI indicates a type 1SRS resource, a TPMI corresponding to a level 1 or level 2 transmission is also indicated. When the SRI indicates a single type 2SRS resource, then there is no TPMI indication and the single SRS resource indicates a port for level 1 transmission. When the SRI indicates two type 2SRS resources, then there is a TPMI indication and the two SRS resources indicate two ports for at least one of the following transmission classes: (i) class 1 only transmission (via class 1 TPMI); (ii) class 2 only transmission (via class 2 TPMI); (iii) level 1 or level 2 transmission (via level 1-2 TPMI).
At least one of examples (4B-0 to 4B-10) for K1And K2. The SRI report is according to at least one of the following alternatives.
In one alternative Alt 4D-0: the joint SRI is used to select (a) a type 1SRS resource, or (b) a single type 2SRS resource, or (c) two type 2SRS resources. In one example, this requiresA bit indication.
In an alternative Alt 4D-1: two separate SRIs 1(SRI1, SRI2) are used, where SRI1 is used to select one of the two types of SRS resources and SRI2 is used to indicate the SRS resources within the selected type of SRS resource. In one example, the SRI1 requires a 1-bit indication, and if SRI1 indicates a type 1SRS resource, the SRI2 requiresThe bit indicates, and if the SRI1 indicates type 2SRS resources, the SRI2 needs toA bit indication.
Note that when K1＝K2These two alternatives are equivalent when 1, since SRI2 is not indicated (not needed). It is also noted that when K1When 1 and SRI1 indicates type 1SRS resources, then SRI2 is not indicated. Likewise, when K2When 1 and SRI1 indicates type 2SRS resources, then SRI2 is not indicated. In one example, the SRI1 is indicated/configured via higher layer RRC signaling. In another example, the SRI1 is indicated/configured via MAC CE based signaling. In another example, SRI1 is indicated/configured via DCI.
In one embodiment 4E, when the number of Tx chains (or antenna ports) at the UE is 2, then the UE is configured with two types of SRS resources (in one SRS resource set or in two different SRS resource sets):
type 1 (non-virtualized or non-precoded): comprises having N1K for 2SRS port1SRS resource, where K1≥0
Type 2 (virtualization or precoding): comprises having N2K for 1SRS port2SRS resource, where K2≥0
K1And K2At least one being greater than 1, i.e. K1＝K20 is not possible. The UE transmits type 1 and/or type 2SRS resources (with or without virtualization as explained in embodiment 1). The gNB measures these SRS resources and indicates the SRI to the UE. When the SRI indicates a type 1SRS resource, a TPMI corresponding to a level 1 or level 2 transmission is also indicated. When the SRI indicates a single type 2SRS resource, then there is no TPMI indication and the single SRS resource indicates a port for level 1 transmission. When the SRI indicates two type 2SRS resources, then: (a) or there is a TPMI indication (indicating unit precoding), and the two SRS resources indicate two ports for level 2 transmission (assuming unit precoding,i.e., 1 layer per port); (b) or there is a TPMI indication (indicating non-unitary precoding) and the two SRS resources indicate two ports for at least one of the following transmission levels: (i) class 1 only transmission (via class 1 TPMI); (ii) class 2 only transmission (via class 2 TPMI); (iii) level 1 or level 2 transmission (via level 1-2 TPMI).
At least one of examples (4B-0 to 4B-10) for K1And K2. The SRI report is according to at least one of the following alternatives.
In one alternative Alt 4E-0: the joint SRI is used to select (a) a type 1SRS resource, or (b) a single type 2SRS resource, or (c) two type 2SRS resources. In one example, this requiresA bit indication.
In one alternative Alt 4E-1: two separate SRIs 1(SRI1, SRI2) are used, where SRI1 is used to select one of the two types of SRS resources and SRI2 is used to indicate the SRS resources within the selected type of SRS resource. In one example, the SRI1 requires a 1-bit indication, and if SRI1 indicates a type 1SRS resource, the SRI2 requiresThe bit indicates, and if the SRI1 indicates type 2SRS resources, the SRI2 needs toA bit indication.
Note that when K1＝K2These two alternatives are equivalent when 1, since SRI2 is not indicated (not needed). It is also noted that when K1When 1 and SRI1 indicates type 1SRS resources, then SRI2 is not indicated. Likewise, when K2When 1 and SRI1 indicates type 2SRS resources, then SRI2 is not indicated. In one example, the SRI1 is indicated/configured via higher layer RRC signaling. In another example, the SRI1 is indicated/configured via MAC CE based signaling. In another example, SRI1 is indicated/configured via DCI.
In one embodiment 4F, when the number of Tx chains (or antenna ports) at the UE is 4, then the UE is configured with two types of SRS resources (in one SRS resource set or in two different SRS resource sets):
type 1 (non-virtualized or non-precoded): comprises having N1K for 4 SRS ports1SRS resource, where K1≥0
Type 2 (virtualization or precoding): comprises having N2K for 1SRS port2SRS resource, where K2≥0
K1And K2At least one being greater than 1, i.e. K1＝K20 is not possible. The UE transmits type 1 and/or type 2SRS resources (with or without virtualization as explained in embodiment 1). The gNB measures these SRS resources and indicates the SRI to the UE. When the SRI indicates a type 1SRS resource, then the TPMI corresponding to a level 1 or level 2 or level 3 or level 4 (or level 1 to ULmaxRank, where ULmaxRank is RRC-configured) transmission is also indicated. When SRI indicates type 2SRS resources, then there is no TPMI indication and the selected resources indicate ports for level 1 transmission. At least one of examples (4B-0 to 4B-10) for K1And K2. The SRI report is in accordance with at least one of Alt 4B-0 and Alt 4B-10. The remaining details regarding SRI indication are the same as in example 4B.
In one embodiment 4G, when the number of Tx chains (or antenna ports) at the UE is 4, then the UE is configured with two types of SRS resources (in one SRS resource set or in two different SRS resource sets):
type 1 (non-virtualized or non-precoded): comprises having N1K for 4 SRS ports1SRS resource, where K1≥0
Type 2 (virtualization or precoding): comprises having N2K for 1SRS port2SRS resource, where k2≥0
k1And K2At least one being greater than 1, i.e. K1＝K20 is not possible. UE transmits type 1 and/or type 2SRS resources (with or withoutWith virtualization as explained in example 1). The gNB measures these SRS resources and indicates the SRI to the UE. When the SRI indicates a type 1SRS resource, then the TPMI corresponding to a level 1 or level 2 or level 3 or level 4 transmission is also indicated. When SRI indicates type 2SRS, then there is no TPMI indication and SRI selects either a single SRS resource indicating a port for level 1 transmission or two SRS resources indicating two ports for level 2 transmission (assuming unitary precoding, i.e. 1 layer per port). At least one of examples (4B-0 to 4B-10) for K1And K2. The SRI report is in accordance with at least one of Alt 4B-0 and Alt 4B-10. The remaining details regarding SRI indication are the same as in example 4B.
In one embodiment 4H, when the number of Tx chains (or antenna ports) at the UE is 4, then the UE is configured with two types of SRS resources (in one SRS resource set or in two different SRS resource sets):
type 1 (non-virtualized or non-precoded): comprises having N1K for 4 SRS ports1SRS resource, where K1≥0
Type 2 (virtualization or precoding): comprises having N2K for 1SRS port2SRS resource, where K2≥0
K1And K2At least one being greater than 1, i.e. K1＝K20 is not possible. The UE transmits type 1 and/or type 2SRS resources (with or without virtualization as explained in embodiment 1). The gNB measures these SRS resources and indicates the SRI to the UE. When the SRI indicates a type 1SRS resource, then the TPMI corresponding to a level 1 or level 2 or level 3 or level 4 transmission is also indicated. When the SRI indicates a single type 2SRS resource, then there is no TPMI indication and the single SRS resource indicates a port for level 1 transmission. When the SRI indicates two type 2SRS resources, then there is a TPMI indication and the two SRS resources indicate two ports for at least one of the following transmission classes: (i) class 1 only transmission (via class 1 TPMI); (ii) class 2 only transmission (via class 2 TPMI); (iii) level 1 or level 2 transmission (via level 1-2 TPMI). At least one of examples (4D-0 to 4D-1) for K1And K2. The SRI report is in accordance with at least one of Alt 4B-0 and Alt 4B-10. The remaining details regarding SRI indication are the same as in example 1D.
In one embodiment 4I, when the number of Tx chains (or antenna ports) at the UE is 4, then the UE is configured with two types of SRS resources (in one SRS resource set or in two different SRS resource sets):
type 1 (non-virtualized or non-precoded): comprises having N1K for 4 SRS ports1SRS resource, where K1≥0
Type 2 (virtualization or precoding): comprises having N2K for 1SRS port2SRS resource, where K2≥0
K1And K2At least one being greater than 1, i.e. K1＝K20 is not possible. The UE transmits type 1 and/or type 2SRS resources (with or without virtualization as explained in embodiment 1). The gNB measures these SRS resources and indicates the SRI to the UE. When the SRI indicates a single type 2SRS resource, then there is no TPMI indication and the single SRS resource indicates a port for level 1 transmission. When the SRI indicates two type 2SRS resources, then either (a) there is a TPMI indication (indicating unity precoding) and the two SRS resources indicate two ports for level 2 transmission (assuming unity precoding, i.e. 1 layer per port), or (b) there is a TPMI indication (indicating non-unity precoding) and the two SRS resources indicate two ports for at least one of the following transmission levels: (i) class 1 only transmission (via class 1 TPMI); (ii) class 2 only transmission (via class 2 TPMI); (iii) level 1 or 2 transmission (via level 1-2 TPMI). At least one of examples (1B-0 to 1B-10) for K1And K2. The SRI report is based on at least one of Alt 4F-0 and Alt 4F-1. The remaining details regarding SRI indication are the same as in example 4F.
In one embodiment 4J, when the number of Tx chains (or antenna ports) at the UE is 4, then the UE is configured with two types of SRS resources (in one SRS resource set or in two different SRS resource sets):
type 1 (non-virtualized or non-virtualized)Precoded): comprises having N1K for 4 SRS ports1SRS resource, where K1≥0
Type 2 (virtualization or precoding): comprises having N2K for 1SRS port2SRS resource, where K2≥0
K1And K2Is greater than 1, i.e., K1＝K20 is not possible. The UE transmits type 1 and/or type 2SRS resources (with or without virtualization as explained in embodiment 1). The gNB measures these SRS resources and indicates the SRI to the UE. When the SRI indicates a type 1SRS resource, then the TPMI corresponding to a level 1 or level 2 or level 3 or level 4 transmission is also indicated. When the SRI indicates type 2SRS, then there is no TPMI indication and the SRI selects either a single SRS resource indicating a port for level 1 transmission, or two SRS resources indicating two ports for level 2 transmission (assuming unitary precoding, i.e. 1 layer per port), or three SRS resources indicating three ports for level 3 transmission (assuming unitary precoding, i.e. 1 layer per port). At least one of examples (4B-0 to 4B-10) for K1And K2. The SRI report is according to at least one of the following alternatives.
In one alternative Alt 4J-0: the joint SRI is used to select: (a) type 1SRS resource: (b) a single type 2SRS resource; (c) two type 2SRS resources; (d) three type 2SRS resources. In one example, this requires A bit indication.
In one alternative Alt 4C-1: two separate SRIs 1(SRI1, SRI2) are used, where SRI1 is used to select one of the two types of SRS resources and SRI2 is used to indicate the SRS resources within the selected type of SRS resource. In one example, the SRI1 requires a 1-bit indication, and if SRI1 indicates a type 1SRS resource, the SRI2 requiresThe bit indicates, and if the SRI1 indicates type 2SRS resources, the SRI2 needs toA bit indication.
The remaining details regarding SRI indication are the same as in example 4C.
In one embodiment 4K, when the number of Tx chains (or antenna ports) at the UE is 4, then the UE is configured with two types of SRS resources (in one SRS resource set or in two different SRS resource sets):
type 1 (non-virtualized or non-precoded): comprises having N1K for 4 SRS ports1SRS resource, where K1≥0
Type 2 (virtualization or precoding): comprises having N2K for 1SRS port2SRS resource, where k2≥0
k1And K2Is greater than 1, i.e., K1＝K20 is not possible. The UE transmits type 1 and/or type 2SRS resources (with or without virtualization as explained in embodiment 1). The gNB measures these SRS resources and indicates the SRI to the UE. When the SRI indicates a type 1SRS resource, then the TPMI corresponding to a level 1 or level 2 or level 3 or level 4 transmission is also indicated.
When the SRI indicates a single type 2SRS resource, then there is no TPMI indication and the single SRS resource indicates a port for level 1 transmission.
When the SRI indicates two type 2SRS resources, then there is a TPMI indication and the two SRS resources indicate two ports for at least one of the following transmission classes: (i) class 1 only transmission (via class 1 TPMI); (ii) class 2 only transmission (via class 2 TPMI); (iii) level 1 or level 2 transmission (via level 1-2 TPMI).
When the SRI indicates three type 2SRS resources, then there is a TPMI indication and the three SRS resources indicate three ports for at least one of the following transmission levels: (i) class 1 only transmission (via class 1 TPMI); (ii) class 2 only transmission (via class 2 TPMI); (iii) level 3 transmission only (via level 3 TPMI); (iv) level 1 or level 2 or level 3 transmissions (via level 1-3 TPMI).
The remaining details regarding SRI indication are the same as in example 4D.
In one embodiment 4L, when the number of Tx chains (or antenna ports) at the UE is 4, then the UE is configured with two types of SRS resources (in one SRS resource set or in two different SRS resource sets):
type 1 (non-virtualized or non-precoded): comprises having N1K for 4 SRS ports1SRS resource, where K1≥0
Type 2 (virtualization or precoding): comprises having N2K for 1SRS port2SRS resource, where K2≥0
K1And K2Is greater than 1, i.e., K1＝K20 is not possible. The UE transmits type 1 and/or type 2SRS resources (with or without virtualization as explained in embodiment 1). The gNB measures these SRS resources and indicates the SRI to the UE. When the SRI indicates a type 1SRS resource, then the TPMI corresponding to a level 1 or level 2 or level 3 or level 4 transmission is also indicated.
When the SRI indicates a single type 2SRS resource, then there is no TPMI indication and the single SRS resource indicates a port for level 1 transmission.
When the SRI indicates two type 2SRS resources, then: either (a) there is a TPMI indication (indicating unit precoding) and the two SRS resources indicate two ports for level 2 transmission (assuming unit precoding, i.e. 1 layer per port), or (b) there is a TPMI indication (indicating non-unit precoding) and the two SRS resources indicate two ports for at least one of the following transmission levels: (i) class 1 only transmission (via class 1 TPI); (ii) class 2 only transmission (via class 2 TPMI); (iii) level 1 or 2 transmission (via the TPMI of level 1-2).
When the SRI indicates three type 2SRS resources, then: or (a) there is a TPMI indication (indicating unit precoding) and three SRS resources indicate three ports for level 2 transmission (assuming unit precoding, i.e. 1 layer per port): or (b) there is a TPMI indication (indicating non-unitary precoding) and the three SRS resources indicate three ports for at least one of the following transmission levels: (i) level 1 transmission only (via level 1 TPIMI); (ii) class 2 only transmission (via class 2 TPMI); (iii) level 3 transmission only (via level 3 TPMI); (iv) for class 1 or class 2 or class 3 transmissions (via class 1-3 TPMI).
The remaining details regarding SRI indication are the same as in example 4F.
In one embodiment 4M, when the number of Tx chains (or antenna ports) at the UE is 4, then the UE is configured with two types of SRS resources (in one SRS resource set or in two different SRS resource sets):
type 1 (non-virtualized or non-precoded): comprises having N1K for 4 SRS ports1SRS resource, where K1≥0
Type 2 (virtualization or precoding): comprising K2SRS resource, where K2＝K21+K22Is divided into sub-types
Omicron type 2 a: having N2K for 1SRS port21SRS resources.
Type 2 b: having N2K for 2SRS ports22SRS resources.
K1And K21Is greater than 1, and K22Greater than 1. Namely K1＝K21＝K220 is not possible. The UE transmits type 1 and/or type 2SRS resources (with or without virtualization as explained in embodiment 1). The gNB measures these SRS resources and indicates the SRI to the UE.
When the SRI indicates a type 1SRS resource, then the TPMI corresponding to a level 1 or level 2 or level 3 or level 4 transmission is also indicated.
When SRI indicates type 2a SRS, then there is no TPMI indication and SRI selects a single SRS resource indicating a port for level 1 transmission.
When the SRI indicates a type 2b SRS, the SRI selects two SRS resources indicating two ports for level 2 transmission. In this case, at least one of the following alternatives is used for the TPMI.
In one alternative, there is no TPMI indication for level 2 transmissions. In this alternative, the UE employs a fixed precoding matrix, e.g., an identity precoding matrix.
In one alternative, there is a TPMI indication for level 2 transmissions.
Note that for type 2SRS resources, rank is the number of SRS ports in the selected SRS resource. The SRI report is according to at least one of the following alternatives.
In one alternative Alt 4M-0: the joint SRI is used to select: (a) one of two types of SRS resources; (b) SRS resources within the selected type of SRS resource. In one example, this requiresA bit indication.
In an alternative Alt 4M-1: two separate SRIs 1(SRI1, SRI2) are used, where SRI1 is used to select one of the two types of SRS resources and SRI2 is used to indicate the SRS resources within the selected type of SRS resource. In one example, the SRI1 requires a 1-bit indication, and the SRI2 requires if the SRI1 indicates a type 1SRS resourceThe bit indicates, and if the SRI1 indicates type 2SRS resources, the SRI2 needs toA bit indication.
In an alternative Alt 4M-2: two separate SRIs 1(SRI1, SRI2) are used, where SRI1 is used to select one of the two types/subtypes of SRS resources and SRI2 is used to indicate the SRS resources within the selected type/subtype of SRS resources. In one example, the SRI1 requires a 2-bit indication, and if SRI1 indicates a type 1SRS resource, the SRI2 requiresBit indication, if SRI1 indicates type 2a SRS resource, then it is requiredA bit indicates, and if SRI1 indicates, a type 2b SRS resource, then this is requiredA bit indication.
The remaining details regarding SRI indication are the same as in example 4C.
In one embodiment 4N, when the number of Tx chains (or antenna ports) at the UE is 4, then the UE is configured with two types of SRS resources (in one SRS resource set or in two different SRS resource sets):
type 1 (non-virtualized or non-precoded): comprises having N1K for 4 SRS ports1SRS resource, where K1≥0
Type 2 (virtualization or precoding): comprising K2SRS resource, where K2＝K21+K22+K23Is divided into sub-types
Omicron type 2 a: having N2K for 1SRS port21SRS resources.
Type 2 b: having N2K for 2SRS ports22SRS resources.
Type 2 c: having N2K for 3 SRS ports23SRS resources.
K1、K21、K22And K23Is greater than 1, i.e. K1＝K21＝K22＝K230 is not possible. The UE transmits type 1 and/or type 2SRS resources (with or without virtualization as explained in embodiment 1). The gNB measures these SRS resources and indicates the SRI to the UE.
When the SRI indicates a type 1SRS resource, then the TPMI corresponding to a level 1 or level 2 or level 3 or level 4 transmission is also indicated.
When SRI indicates type 2a SRS, then there is no TPMI indication and SRI selects a single SRS resource indicating a port for level 1 transmission.
When the SRI indicates a type 2b SRS, the SRI selects two SRS resources indicating two ports for level 2 transmission. In this case, at least one of the following alternatives is used for TPMI.
In one alternative, there is no TPMI indication for level 2 transmissions. In this alternative, the UE employs a fixed precoding matrix, e.g., an identity precoding matrix.
In one alternative, there is a TPMI indication for level 2 transmissions.
When the SRI indicates a type 2c SRS, the SRI selects three SRS resources indicating three ports for class 3 transmission. In this case, at least one of the following alternatives is used for the TPMI.
In one alternative, there is no TPMI indication for class 3 transmissions. In this alternative, the UE employs a fixed precoding matrix, e.g., an identity precoding matrix.
In one alternative, there is a TPMI indication for class 3 transmissions.
For type 2SRS resources, rank is the number of SRS ports in the selected SRS resource. The SRI report is according to at least one of the following alternatives.
In one alternative Alt 4M-0: the joint SRI is used to select: (a) one of two types of SRS resources; (b) SRS resources within the selected type of SRS resource. In one example, this requiresA bit indication.
In an alternative Alt 4M-1: two separate SRIs 1(SRI1, SRI2) are used, where SRI1 is used to select one of the two types of SRS resources and SRI2 is used to indicate the SRS resources within the selected type of SRS resource. In one example, the SRI1 requires a 1-bit indication, and if SRI1 indicates a type 1SRS resource, the SRI2 requiresThe bit indicates, and if the SRI1 indicates type 2SRS resources, the SRI2 needs toA bit indication.
In an alternative Alt 4M-2: two separate SRIs 1(SRI1, SRI2) are used, where SRI1 is used to select one of the two types/subtypes of SRS resources, and SRI2 is used to indicate the SRS resources within the selected type/subtype of SRS resources. In one example, if the SRI1 indicates type 1SRS resources, the SRI1 requires a 2-bit indication and the SRI2 requiresBit indication that type 2a SRS resource is required if SRI1 indicatesBit indication, if SRI1 indicates type 2b SRS resource, then it is requiredA bit indicates, and if SRI1 indicates, a type 2c SRS resource, then this is requiredA bit indication.
The remaining details regarding SRI indication are the same as in example 4C.
In a variation of this embodiment, the type 1SRS resources may also be virtualized or precoded. Likewise, the type 2SRS resources may also be non-virtualized or non-precoded.
In one example, full power UL transmission according to some embodiments of the present disclosure is referred to as mode 2. The UE reports through its capability signaling whether it can support full power UL transmission according to mode 2. If the UE is capable of supporting full power UL transmission according to mode2, the gNB or Network (NW) may configure full power UL transmission to the UE via higher layer signaling set to the parameters ulFPTx or ulFPTxModes of mode 2.
In one embodiment 5, when the UE is configured with codebook-based UL transmission (e.g., via a higher layer parameter txConfig ═ codebook) and is also configured with full-power UL transmission (e.g., via a higher layer parameter ulFPTx or ulFPTxModes ═ Mode2) according to some embodiments of the present disclosure, the indication/configuration of SRI (indicating one of the multiple SRS resources) and TRI/TPMI (e.g., via parameter precoding information and number of layers) is according to at least one of the following alternatives.
In an alternative Alt 5-1, when the UE is configured with multiple SRS resources (type 1 and/or type 2), then SRI is indicated/configured via higher layer signaling and TRI/TPMI is indicated/configured via DCI (e.g., NR DCI format 0_ 1). Note that the TRI/TPMI size (number of bits or payload) depends on the number of SRS ports associated with the indicated SRS resource. For example, the payload of the 4-port SRS resource is greater than the payload of the 2-port SRS resource. However, since SRI is indicated via higher layer signaling, the TRI/TPMI size in the DCI is fixed once the UE receives the RRC configuration.
In one alternative Alt 5-1A, when the UE is configured with multiple SRS resources (type 1 and/or type 2), then the number of SRS ports (X) associated with the SRS resources (indicated via SRI in DCI) is indicated/configured via higher layer signaling, and the SRI and TRI/TPMI are indicated/configured via DCI (e.g., NR DCI format 0_ 1). The SRI is indicated via the DCI only when there are a plurality of SRS resources having a plurality of SRS ports.
In an alternative Alt 5-2, when the UE is configured with multiple SRS resources (type 1 and/or type 2), then the SRI is indicated/configured via MAC CE based signaling and the TRI/TPMI is indicated/configured via DCI (e.g., NR DCI format 0_ 1). Note that the TRI/TPMI size (number of bits or payload) depends on the number of SRS ports associated with the indicated SRS resource. For example, the payload of the 4-port SRS resource is greater than the payload of the 2-port SRS resource. However, since SRI is indicated via MAC CE based signaling, the TRI/TPMI size in DCI is fixed once the UE receives MAC CE signaling.
In one alternative Alt 5-2A, when the UE is configured with multiple SRS resources (type 1 and/or type 2), then the number of SRS ports (X) associated with the SRS resources (indicated via SRI in DCI) is indicated/configured via MAC CE-based signaling, and the SRI and TRI/TPMI are indicated/configured via DCI (e.g., NR DCI format 0_ 1). Only when there are multiple SRS resources with multiple SRS ports X, SRI is indicated via DCI.
In an alternative Alt 5-3, when the UE is configured with multiple SRS resources (type 1 and/or type 2), then the SRI and TRI/TPMI are indicated/configured via DCI (e.g., NR DCI format 0_ 1). Since the TRI/TPMI size (number of bits or payload) may vary depending on the number of SRS ports associated with multiple SRS resources, the DCI payload may be ambiguous. To avoid this ambiguity, the TRI/TPMI size may be fixed to the maximum (or highest) TRI/TPMI size, where the maximum is across all SRS resources. In one example, the maximum value corresponds to an SRS resource having a maximum number of SRS ports.
In an alternative Alt 5-4, when the UE is configured with multiple SRS resources (type 1 and/or type 2), then the SRI and TRI/TPMI are jointly indicated/configured via a single field in the DCI (e.g., NR DCI format 0_ 1).
In an alternative Alt 5-5, when the UE is configured with multiple SRS resources (type 1 and/or type 2) with the same number of SRS ports, then the SRI is indicated/configured via DCI (e.g., via NR DCI format 0_ 1). When the UE is configured with multiple SRS resources with at least two SRS resources with different numbers of SRS ports, then the SRI is indicated/configured via higher layer (e.g., RRC) signaling or optionally via MAC CE based signaling. The TRI/TPMI indication is via DCI.
In one embodiment 6, according to some embodiments of the present disclosure, a UE is always configured with K-K for full power UL transmission1+K2SRS resources of ≧ 2, wherein (a) K1Not less than 1 and K2Not less than 1 and/or (b) K1＝0，K2≧ 2, and there are at least 2 (type 2) SRS resources with different numbers of SRS ports. In one example K ∈ {2,4}, inIn one example, for 2 antenna ports K2 at the UE and 4 antenna ports K e {2,4} at the UE. Note that at least two SRS resources (other than KSRS resources) with different numbers of SRS ports are required. The number of SRS ports in each KSRS resource is according to at least one of the following alternatives.
In an alternative Alt 6-1, the number of SRS ports in each KSRS resource belongs to {1,2,3,4 }. In particular, the number of SRS ports in each KSRS resource belongs to {1, 2} for 2 antenna ports at the UE, and the number of SRS ports in each KSRS resource belongs to {1,2,3,4} for 4 antenna ports at the UE.
An example of all possible SRS resource combinations for 2 antenna ports at the UE and K-2 is shown in table 44.
An example of all possible SRS resource combinations for 2 antenna ports at the UE and K-3 is shown in table 45. In one example, the UE may be configured with any one of the SRS resource combinations from table 45. In another example, the UE can only be configured with a fixed combination of SRS resources. An example of a fixed SRS resource combination is an SRS resource combination index of 0.
An example of all possible SRS resource combinations for 2 antenna ports at the UE and K-4 is shown in table 46. In one example, the UE may be configured with any one of the SRS resource combinations from table 46. In another example, the UE can only be configured with a fixed combination of SRS resources. An example of a fixed SRS resource combination is an SRS resource combination index of 0. In another example, the UE can only configure SRS resource combinations from a subset of all SRS resource combinations in table 46. In one example, the subset corresponds to an SRS resource combination index of 0-1.
Table 44: SRS resource combination for 2 antenna ports and K2
SRS resource combination index
Number of 1-port SRS resources
Number of 2-port SRS resources
0
1
1
Table 45: SRS resource combination for 2 antenna ports and K-3
SRS resource combination index
Number of 1-port SRS resources
Number of 2-port SRS resources
0
2
1
1
1
2
Table 46: SRS resource combination for 2 antenna ports and K4
SRS resource combination index
1-number of port SRS resources.
Number of 2-port SRS resources.
0
3
1
1
2
2
2
1
3
An example of all possible SRS resource combinations for 4 antenna ports at the UE and K ═ 2 is shown in table 47. In one example, the UE may be configured with any one of the SRS resource combinations from table 47. In another example, the UE can only be configured with a fixed combination of SRS resources. An example of a fixed SRS resource combination is an SRS resource combination index of 2. In another example, the UE can only configure SRS resource combinations from a subset of all SRS resource combinations in table 47. In one example, the subset corresponds to SRS resource combination indices 0-2.
Table 47: SRS resource combination for 4 antenna ports and K-2
An example of all possible SRS resource combinations for 4 antenna ports at the UE and K-3 is shown in table 48. In one example, the UE may be configured with any one of the SRS resource combinations from table 48. In another example, the UE can only be configured with a fixed combination of SRS resources. An example of a fixed SRS resource combination is an SRS resource combination index of 1. In another example, the UE can only configure SRS resource combinations from a subset of all SRS resource combinations in table 48. In one example, the subset corresponds to SRS resource combination indices 0-3.
Table 48: SRS resource combination for 4 antenna ports and K-3
An example of all possible SRS resource combinations for 4 antenna ports at the UE and K-4 is shown in table 49. In one example, the UE may be configured with any one of the SRS resource combinations from table 49. In another example, the UE can only be configured with a fixed combination of SRS resources. An example of a fixed SRS resource combination is an SRS resource combination index of 0. In another example, the UE can only configure SRS resource combinations from a subset of all SRS resource combinations in table 49. In one example, the subset corresponds to SRS resource combination indices 0-12.
Table 49: SRS resource combination for 4 antenna ports and K4
In an alternative Alt 6-2, the number of SRS ports in each KSRS resource belongs to {1,2,4 }. In particular, the number of SRS ports in each KSRS resource belongs to {1, 2} for 2 antenna ports at the UE, and the number of SRS ports in each KSRS resource belongs to K {1,2,4} for 4 antenna ports at the UE.
An example of all possible SRS resource combinations for 4 antenna ports at the UE and K-2 is shown in table 50. In one example, the UE may be configured with any one of the SRS resource combinations from table 50. In another example, the UE can only be configured with a fixed combination of SRS resources. An example of a fixed SRS resource combination is an SRS resource combination index of 1. In another example, the UE can only configure SRS resource combinations from a subset of all SRS resource combinations in table 50. In one example, the subset corresponds to an SRS resource combination index of 0-1.
Table 50: SRS resource combination for 4 antenna ports and K-2
An example of all possible SRS resource combinations for 4 antenna ports at the UE and K-3 is shown in table 51. In one example, the UE may be configured with any one of the SRS resource combinations from table 51. In another example, the UE can only be configured with a fixed combination of SRS resources. An example of a fixed SRS resource combination is an SRS resource combination index of 0. In another example, the UE can only be configured with SRS resource combinations from a subset of all SRS resource combinations in table 51. In one example, the subset corresponds to an SRS resource combination index of 0-1.
Table 51: SRS resource combination for 4 antenna ports and K-3
An example of all possible SRS resource combinations for 4 antenna ports at the UE and K-4 is shown in table 52. In one example, the UE may be configured with any one of the SRS resource combinations from table 52. In another example, the UE can only be configured with a fixed combination of SRS resources. An example of a fixed SRS resource combination is an SRS resource combination index of 0. In another example, the UE can only configure SRS resource combinations from a subset of all SRS resource combinations in table 52. In one example, the subset corresponds to SRS resource combination indices 0-2.
Table 52: SRS resource combination for 4 antenna ports and K4
In one embodiment 7, when a UE is configured with codebook-based UL transmissions (e.g., via a higher layer parameter txConfig ═ codebook) and is also configured with full-power UL transmissions (e.g., via a higher layer parameter ulFPTx or ulFPTxModes ═ Mode2), the UE may be configured with multiple SRS resources with different numbers of SRS ports. If there are four antenna ports at the UE, the UE may be configured with multiple SRS resources with multiple SRS ports belonging to {1,2,4} or {1,2,3,4}, as proposed in some embodiments of the present disclosure. For a UE reporting its UE capability for "partial anti dnoncode" transmission, when at least 2(≧ 2) SRS resources with one SRS resource comprising 4 SRS ports and another SRS resource comprising 2SRS ports are configured, then the codebook for TRI/TPMI indication (via DCI) is in accordance with at least one of the following alternatives.
In an alternative Alt 7-1, when the UE is configured with a higher layer parameter codekoksubset ═ partialandnconcode.
When SRI (via DCI indication) indicates SRS resources with 4 SRS ports, then the UE uses the 4TxUL codebook for "partialandncouherent" for TRI/TPMI indication (available using table 2, table 4, table 5, table 6 and table 8).
When SRI (via DCI indication) indicates SRS resources with 2SRS ports, then at least one of the following alternatives is used.
Omicron in one alternative Alt 7-1-1: the UE uses the 2Tx UL codebook for the "partial anti dnoncode" indicated by TRI/TPMI (available using tables 1, 3 and 7).
Omicron in one alternative Alt 7-1-2: the UE uses the 2Tx UL codebook for "Non-Coherent" indicated by TRI/TPMI (available using tables 1, 3 and 7).
Omicron in one alternative Alt 7-1-3: the UE uses the 2TxUL codebook for "Non-Coherent" or "partial anti dnoncoherent" indicated by TRI/TPMI (available using tables 1, 3 and 7). At least one of the following sub-alternatives is used.
In one alternative Alt 7-1-3-1: whether the 2Tx codebook is "nocourigent" or "partial any nconcode" can be configured via higher layer (RRC) signaling via individual parameters or together with other parameters.
In one alternative Alt 7-1-3-2: whether the 2Tx codebook is "non-coherent" or "partial anti dnoncoherent", the UE capability can be obeyed, i.e., whether the UE reports via its capability signaling via a separate field or with other fields as "non-coherent" or "partial anti dnoncoherent". If the UE reports only one of "Non-Coherent" or "partial anti-dNoncoherent", the codebook reported by the UE is used. Alternatively, if the UE reports both "Non-code" and "partial anti dnoncode", one of the two codebooks is configured via a separate parameter or together with other parameters via higher layer (RRC) signaling.
In an alternative Alt 7-2, when the UE is configured with a higher layer parameter codeboost subset ═ nocoherenent.
When SRI (via DCI indication) indicates SRS resources with 4 SRS ports, then the UE uses the 4Tx UL codebook for "Non-Coherent" for TRI/TPMI indication (available using tables 2,4, 5, 6 and 8).
When SRI (via DCI indication) indicates SRS resources with 2SRS ports, then at least one of the following alternatives is used.
AlT 7-2-1: the UE uses the 2Tx UL codebook for the "partial anti dnoncode" indicated by TRI/TPMI (available using tables 1, 3 and 7).
AlT 7-2-2: the UE uses the 2Tx UL codebook for "Non-Coherent" indicated by TRI/TPMI (available using tables 1, 3 and 7).
AlT 7-2-3: the UE uses the 2Tx UL codebook for "Non-Coherent" or "partial anti dnoncoherent" for TRI/TPMI indication (available using tables 1, 3 and 7). At least one of the following sub-alternatives is used.
ALT [7-2-3-1 ]: whether the 2Tx codebook is "nocoherenent" or "partial any nconcodebook", it can be configured via higher layer (RRC) signaling, via individual parameters or together with other parameters.
ALT [7-2-3-2 ]: whether the 2Tx codebook is "non-coherent" or "partial anti dnoncoherent", the UE capability can be obeyed, i.e., whether the UE reports via its capability signaling via a separate field or with other fields as "non-coherent" or "partial anti dnoncoherent". If the UE reports only one of "Non-Coherent" or "partial anti-dNoncoherent", the codebook reported by the UE is used. Alternatively, if the UE reports "Non-code" and "partial anti dnoncode", one of the two codebooks is configured via a separate parameter or together with other parameters via higher layer (RRC) signaling.
In an alternative Alt 7-3, the UE is configured with a higher layer parameter codekoksubset ═ nocourent "or" partialAndNonCoherent "
When SRI (via DCI indication) indicates SRS resources with 4 SRS ports, then the UE uses (according to the configuration) the 4Tx UL codebook for "Non-Coherent" or "partialandncouercent" for TRI/TPMI indication (available using tables 2,4, 5, 6 and 8).
When SRI (via DCI indication) indicates SRS resources with 2SRS ports, then at least one of the following alternatives is used.
In an alternative Alt 7-3-1: the UE uses the 2Tx UL codebook for the "partial anti dnoncode" indicated by TRI/TPMI (available using tables 1, 3 and 7).
In an alternative Alt 7-3-2: the UE uses the 2Tx UL codebook for "Non-Coherent" for TRI/TPMI indication (available using tables 1, 3 and 7).
In one alternative, Alt 7-3-3: the UE uses the 2Tx UL codebook for "Non-Coherent" or "partial anti dnoncoherent" for TRI/TPMI indication (available using tables 1, 3 and 7). At least one of the following sub-alternatives is used.
In one alternative Alt 7-3-3-1: whether the 2Tx codebook is "nocourigent" or "partial any nconcode" can be configured via higher layer (RRC) signaling via individual parameters or together with other parameters.
In one alternative Alt 7-3-3-2: whether the 2Tx codebook is "non-codebook" or "partial anti-dnoncodebook" may be subject to UE capabilities, i.e., whether the UE reports "non-codebook" or "partial anti-dnoncodebook" via its capability signaling via a separate field or with other fields. If the UE reports only one of "Non-Coherent" or "partial anti-dNoncoherent", the codebook reported by the UE is used. Alternatively, if the UE reports "Non-code" and "partial anti dnoncode", one of the two codebooks is configured via a separate parameter or together with other parameters via higher layer (RRC) signaling.
In one example, only one of Alt 7-1 through Alt 7-3 is fixed (supported). In another example, multiple of Alt 7-1 through Alt 7-3 are supported, and one of the supported alternatives is configured via higher layer (RRC) signaling.
In one example, only one of Alt 7-1-1 through Alt 7-1-3 is fixed (supported). In another example, multiple of Alt 4-1-1 through Alt 4-1-3 are supported, and one of the supported alternatives is configured via higher layer (RRC) signaling.
In one example, only one of Alt 7-2-1 through Alt 7-2-3 is fixed (supported). In another example, multiple of Alt 7-2-1 through Alt 7-2-3 are supported and one of the supported alternatives is configured via higher layer (RRC) signaling.
In one example, only one of Alt 7-3-1 through Alt 7-3-3 is fixed (supported). In another example, multiple of Alt 7-3-1 through Alt 7-3-3 are supported, and one of the supported alternatives is configured via higher layer (RRC) signaling.
In one example, only one of Alt 7-1-3-1 through Alt 7-1-3-2 is fixed (supported). In another example, a plurality of Alt 7-1-3-1 through Alt 7-1-3-2 are supported and one of the supported alternatives is configured via higher layer (RRC) signaling.
In one example, only one of Alt 7-2-3-1 through Alt 7-2-3-2 is fixed (supported). In another example, multiple of Alt 7-2-3-1 through Alt 7-2-3-2 are supported and one of the supported alternatives is configured via higher layer (RRC) signaling.
In one example, only one of Alt 7-3-3-1 through Alt 7-3-3-2 is fixed (supported). In another example, multiple of Alt 7-3-3-1 through Alt 7-3-3-2 are supported and one of the supported alternatives is configured via higher layer (RRC) signaling.
Fig. 14 shows a flow diagram of a method 1400 for operating a User Equipment (UE) that may be performed by the UE in accordance with an embodiment of the disclosure. The embodiment of the method 1400 shown in FIG. 14 is for illustration only. Fig. 14 does not limit the scope of the present disclosure to any particular implementation.
As shown in fig. 14, method 1400 begins at step 1402. In step 1402, the UE (e.g., 111-116 shown in fig. 1) transmits UE capability information including a full power transmission capability of the UE to a Base Station (BS), wherein the full power transmission capability of the UE includes a parameter S for indicating a set of full power Transmit Precoding Matrix Indicators (TPMI).
In step 1404, the UE receives configuration information for Physical Uplink Shared Channel (PUSCH) transmission from the BS, wherein the configuration information includes the TPMI.
In step 1406, the UE determines a PUSCH transmission.
In step 1408, the UE determines a power level for the PUSCH transmission.
In step 1410, the UE sends a PUSCH transmission to the BS at the determined power level.
The power level corresponds to full power based on a TPMI included in a set of full power TPMI, and the TPMI indicates a precoding matrix and a number of layers for PUSCH transmission.
In one embodiment, the UE receives a portion including configuration information of the TPMI via Downlink Control Information (DCI).
In one embodiment, the UE capability information includes a coherence capability of antenna ports at the UE, wherein the coherence capability is one of non-coherent or partially coherent, the partially coherent indicates a layer at most two antenna ports at the UE available to send PUSCH transmissions, and the non-coherent indicates a layer at the UE only a single antenna port available to send PUSCH transmissions.
In one embodiment, when a UE has 2 antenna ports and a set of full power TPMI corresponds to a non-coherent TPMI group, the parameter S indicates one of the TPMI groups G0... G2 given by the following table:
in one embodiment, when the UE has 4 antenna ports and a set of full power TPMI corresponds to a non-coherent TPMI group, the parameter S indicates one of the TPMI groups G0... G3 given by the following table:
in one embodiment, when the UE has 4 antenna ports and a set of full power TPMI corresponds to a partially coherent TPMI group, the parameter S indicates one of the TPMI groups G0... G6 given by the following table:
in one embodiment, when the UE has 4 antenna ports and a set of full power TPMI corresponds to a partially coherent TPMI group, the parameter S indicates one of the TPMI groups G0... G14 given by the following table:
fig. 15 shows a flow diagram of another method 1500 that may be performed by a Base Station (BS) in accordance with an embodiment of the disclosure. The embodiment of the method 1500 shown in FIG. 15 is for illustration only. Fig. 15 does not limit the scope of the present disclosure to any particular implementation.
As shown in fig. 15, method 1500 begins at step 1502. In step 1502, the BS (e.g., 101-.
In step 1504, the BS generates configuration information for Physical Uplink Shared Channel (PUSCH) transmission, wherein the configuration information includes the TPMI.
In step 1506, the BS transmits configuration information for PUSCH transmission to the UE.
In step 1508, the BS receives a PUSCH transmission from the UE sent at a power level.
If the TPMI is included in a set of full-power TPMI, and the TPMI indicates a precoding matrix and the number of layers for PUSCH transmission, the power level corresponds to full power.
In one embodiment, the BS transmits the portion including the configuration information of the TPMI via Downlink Control Information (DCI).
In one embodiment, the UE capability information includes a coherence capability of antenna ports at the UE, wherein the coherence capability is one of non-coherent or partially coherent, the partially coherent indicates a layer at most two antenna ports at the UE available to send PUSCH transmissions, and the non-coherent indicates a layer at the UE only a single antenna port available to send PUSCH transmissions.
In one embodiment, when a UE has 2 antenna ports and a set of full power TPMI corresponds to a non-coherent TPMI group, the parameter S indicates one of the TPMI groups G0... G2 given by the following table:
in one embodiment, when the UE has 4 antenna ports and a set of full power TPMI corresponds to a non-coherent TPMI group, the parameter S indicates one of the TPMI groups G0... G3 given by the following table:
in one embodiment, when the UE has 4 antenna ports and a set of full power TPMI corresponds to a partially coherent TPMI group, the parameter S indicates one of the TPMI groups G0... G6 given by the following table:
although the present disclosure has been described with exemplary embodiments, various changes and modifications may be suggested to one skilled in the art. The present disclosure is intended to embrace such alterations and modifications as fall within the scope of the appended claims. None of the description in this application should be read as implying that any particular element, step, or function is an essential element which must be included in the claim scope.
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