UL transmission with full TX power at UE

文档序号：1382795 发布日期：2020-08-14 浏览：10次中文

阅读说明：本技术 在ue处利用全tx功率进行ul传送 (UL transmission with full TX power at UE ) 是由杨维东周子涵苏昭诚于 2019-06-20 设计创作，主要内容包括：本发明的一方面提供一种方法、计算机可读介质以及设备。该设备可以是UE。UE可向基站报告该UE的传送能力。UE可从基站接收对码本中的码字的子集进行指示的第一信令以及对该子集中的一个码字进行选择的第二信令,来对用于在一个或多个空间层上通过多个天线端口传送的上行链路信道进行预编码。(An aspect of the invention provides a method, a computer-readable medium, and an apparatus. The apparatus may be a UE. The UE may report the transmit capabilities of the UE to the base station. The UE may receive first signaling from the base station indicating a subset of codewords in the codebook and second signaling selecting one codeword in the subset to precode uplink channels for transmission over multiple antenna ports on one or more spatial layers.)

1. A method of wireless communication of a user equipment, the method comprising:

receiving, from a base station, an indication to adjust transmission of an uplink channel on a plurality of antenna ports;

determining, in accordance with the adjusting, whether a first antenna port of the plurality of antenna ports is used to transmit the uplink channel and whether a second antenna port of the plurality of antenna ports is not used to transmit the uplink channel, wherein a first power amplifier is in a first transmit chain connected with the first antenna port, a maximum power of the first power amplifier being below a first threshold;

connecting a second power amplifier with the first antenna port when it is determined that the first antenna port is used to transmit the uplink channel and the second antenna port is not used to transmit the uplink channel, wherein the second power amplifier is in a second transmit chain connected with the second antenna port, a maximum power of the second power amplifier being greater than or equal to the first threshold; and

transmitting the uplink channel to the base station through the second power amplifier and the first antenna port at a power greater than or equal to the first threshold.

2. The method of claim 1, wherein the indication indicates a codeword in a codebook, the codeword being used by a precoder of the user equipment when the uplink channel is transmitted through one or more of the plurality of antenna ports.

3. The method of claim 1, wherein the first antenna port and the second antenna port are in a first set of antenna ports, and a third antenna port and a fourth antenna port of the plurality of antenna ports are in a second set of antenna ports, the method further comprising:

determining, from the adjusting, whether the third antenna port is used to transmit the uplink channel and whether the fourth antenna port is not used to transmit the uplink channel, wherein a third power amplifier is in a third transmit chain connected to the third antenna port, a maximum power of the third power amplifier being below the first threshold;

connecting a fourth power amplifier with the third antenna port when the third antenna port is determined to be used for transmitting the uplink channel, wherein the fourth power amplifier is in a fourth transmit chain connected with the fourth antenna port, and a maximum power of the fourth power amplifier is greater than or equal to the first threshold; and

transmitting the uplink channel through the fourth power amplifier and the third antenna port at a power greater than or equal to the first threshold.

4. The method of claim 3, wherein only one of the first antenna port, the second antenna port, the third antenna port, and the fourth antenna port is determined to be used for transmitting the uplink channel.

5. The method of claim 3, wherein one antenna port in each of the first and second groups is determined for transmitting the uplink channel.

6. A method of wireless communication of a user equipment, the method comprising:

reporting a transmission capability of the user equipment to a base station; and

receiving, from the base station, first signaling indicating a subset of codewords in a codebook and second signaling selecting one codeword in the subset to precode uplink channels for transmission over multiple antenna ports on one or more spatial layers.

7. The method of claim 6, wherein the method further comprises:

determining, from the selected codeword, to use each of the plurality of antenna ports for transmitting the uplink channel;

applying a cyclic delay to at least one of the transmit chains connected to the plurality of antenna ports when it is determined that each of the plurality of antenna ports is to be used for transmitting the uplink channel; and

transmitting the uplink channel through each of the plurality of antenna ports.

8. The method of claim 6, wherein the second signaling comprises an index referencing a codeword in the subset of the codewords.

9. The method of claim 6, wherein the reported transmission capability of the user device indicates non-coherent transmission, wherein a codeword in the subset indicated by the first signaling is a precoder for the user device, and wherein the user device is adjusted to transmit the uplink channel of one spatial layer at non-zero power on two or more of the plurality of antenna ports.

10. The method of claim 6, wherein the reported transmission capability of the user device indicates partial coherent transmission, wherein a codeword in the subset indicated by the first signaling is a precoder for the user device, and wherein the user device is adjusted to transmit the uplink channel of one spatial layer with non-zero power on all of the plurality of antenna ports.

11. An apparatus for wireless communication, the apparatus being a user equipment, the apparatus comprising:

a memory; and

at least one processor coupled to the memory and configured to:

receiving, from a base station, an indication to adjust transmission of an uplink channel on a plurality of antenna ports;

transmitting the uplink channel to the base station through the second power amplifier and the first antenna port at a power greater than or equal to the first threshold.

12. The apparatus of claim 11, wherein the indication indicates a codeword in a codebook, the codeword being used by a precoder of the user equipment when the uplink channel is transmitted through one or more of the plurality of antenna ports.

13. The device of claim 11, wherein the first antenna port and the second antenna port are in a first set of antenna ports, a third antenna port and a fourth antenna port of the plurality of antenna ports are in a second set of antenna ports, the at least one processor further configured to:

transmitting the uplink channel through the fourth power amplifier and the third antenna port at a power greater than or equal to the first threshold.

14. The apparatus of claim 13, wherein only one of the first antenna port, the second antenna port, the third antenna port, and the fourth antenna port is determined to be used for transmitting the uplink channel.

15. The apparatus of claim 13, wherein one antenna port in each of the first and second groups is determined for transmitting the uplink channel.

16. An apparatus for wireless communication, the apparatus being a user equipment, the apparatus comprising:

a memory; and

at least one processor coupled to the memory and configured to:

reporting a transmission capability of the user equipment to a base station; and

17. The device of claim 16, wherein the at least one processor is further configured to:

determining, from the selected codeword, to use each of the plurality of antenna ports for transmitting the uplink channel;

transmitting the uplink channel through each of the plurality of antenna ports.

18. The apparatus of claim 16, wherein the second signaling comprises an index referencing a codeword in the subset of the codewords.

19. The apparatus of claim 16, wherein the reported transmission capability of the user device indicates non-coherent transmission, wherein a codeword in the subset indicated by the first signaling is a precoder for the user device, and wherein the user device is adjusted to transmit the uplink channel of one spatial layer at non-zero power on two or more of the plurality of antenna ports.

20. The apparatus of claim 16, wherein the reported transmission capability of the user device indicates partial coherent transmission, wherein a codeword in the subset indicated by the first signaling is a precoder for the user device, and wherein the user device is adjusted to transmit the uplink channel of one spatial layer with non-zero power on all of the plurality of antenna ports.

Technical Field

The present invention relates generally to communication systems, and more particularly, to a technique for releasing (release) a Protocol Data Unit (PDU) session by a User Equipment (UE).

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. A typical wireless communication system may employ multiple-access (multiple-access) techniques that are capable of supporting communication with multiple users by sharing the available system resources. Examples of Multiple Access techniques include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single-Carrier Frequency Division Multiple Access (SC-FDMA) systems, and Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems.

The above-described multiple access techniques have been employed in various telecommunications standards to provide common protocols that may enable different wireless devices to communicate at a city level, a country level, a region level, or even a global level. One example of a telecommunications standard is the fifth Generation (5th Generation, 5G) New Radio (NR). The 5G NR is part of the continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3 GPP) to meet new requirements associated with latency, reliability, security, scalability (scalability), such as with the Internet of Things (IoT), among other requirements. Some aspects of 5G NR may be based on the fourth Generation (4th Generation, 4G) Long Term Evolution (LTE) standard. The 5G NR technique requires further improvements which may also be applicable to other multiple access techniques and telecommunications standards employing these techniques.

Disclosure of Invention

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. This summary is provided to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

An aspect of the invention provides a method, a computer-readable medium, and an apparatus. The apparatus may be a UE. An aspect of the invention provides a method, a computer-readable medium, and an apparatus. The apparatus may be a UE. The UE may report transmit capability (transmit capability) of the UE to the base station. The UE may receive first signaling from the base station indicating a subset of codewords in the codebook and second signaling selecting one codeword in the subset to precode uplink channels for transmission over multiple antenna ports on one or more spatial layers.

To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following detailed description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed and the present invention is intended to include all such aspects and their equivalents.

Drawings

Fig. 1 is a schematic diagram illustrating an example of a wireless communication system and an access network.

Fig. 2 is a schematic diagram illustrating a base station communicating with a UE in an access network.

Fig. 3 illustrates an example logical architecture of a distributed access network.

Fig. 4 illustrates an example physical architecture of a distributed access network.

Fig. 5 is a diagram illustrating an example of a Downlink (DL) center subframe.

Fig. 6 is a diagram illustrating an example of an Uplink (UL) center subframe.

Fig. 7 is a schematic diagram illustrating uplink transmission at a UE 704.

Fig. 8 is a diagram illustrating a codebook (codebook).

Fig. 9A shows a table listing the number of codewords (codeword) allocated to full coherent transmission (full coherent transmission), partial coherent transmission (partial coherent transmission), and non-coherent transmission (non-coherent transmission).

Fig. 9B shows a table listing the number of codewords available for fully coherent transmission, partially coherent transmission, and non-coherent transmission.

Fig. 10 is a schematic diagram illustrating uplink transmission at a UE.

Fig. 11 is a flowchart of a method (process) of transmitting an uplink channel.

Fig. 12 is another flowchart of a method (process) of transmitting an uplink channel.

FIG. 13 is a conceptual data flow diagram illustrating data flow between different components/means (mean) in an exemplary device.

Fig. 14 is a schematic diagram illustrating an example of a hardware implementation of a device employing a processing system.

Detailed Description

The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts of the present invention may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. However, it will be apparent to one skilled in the art that the concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid obscuring such concepts.

In the following, aspects of a telecommunications system will be presented with reference to various apparatus and methods. These devices and methods are described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

For example, an element, or any portion of an element, or any combination of elements, may be implemented as a "processing system" that includes one or more processors. Examples of processors include: a microprocessor, a microcontroller, a Graphics Processing Unit (GPU), a Central Processing Unit (CPU), an application Processor, a Digital Signal Processor (DSP), a Reduced Instruction Set Computing (RISC) Processor, a system On a Chip (SoC), a baseband Processor, a Field Programmable Gate Array (FPGA), a Programmable Logic Device (PLD), a state machine (state machine), a gating Logic, a discrete hardware circuit, and other suitable hardware configured to perform the various functions described herein. One or more processors in the processing system may execute software. Software shall be construed broadly to mean any form, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise: instructions, instruction sets, code segments, program code, programs, subprograms, software components, application programs, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.

Thus, in one or more example embodiments, the functions may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium. Computer readable media includes computer storage media. A storage media may be any available media that can be accessed by a computer. Such computer readable media may include: Random-Access Memory (RAM), Read-only Memory (ROM), Electrically Erasable Programmable Read-only Memory (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the foregoing types of computer-readable media, or any other medium that can be used to store computer-executable code in the form of instructions or data structures and that can be accessed by a computer, which is used as an example only and is not intended to limit the present invention.

Fig. 1 is a schematic diagram illustrating an example of a wireless communication system and an access network 100. A Wireless communication system (also referred to as a Wireless Wide Area Network (WWAN)) includes: base station 102, UE 104, and core network 160. The base station 102 may include a macro cell (high power cellular base station) and/or a small cell (small cell) (low power cellular base station). The macro cell includes a base station. Small cells include femto cells (femtocells), pico cells (picocells), and micro cells (microcells).

The base stations 102, collectively referred to as evolved universal Mobile Telecommunications System Terrestrial Radio Access Network (E-UTRAN), interface with the core Network 160 via backhaul links 132 (e.g., S1 interface). Base station 102 may perform one or more of the following functions, among others: communicating user data, Radio channel encryption and decryption, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection establishment and release, load balancing, distributing Non-Access stratum (NAS) messages, NAS node selection, synchronization, Radio Access Network (RAN) sharing, Multimedia Broadcast Multicast Service (MBMS), subscriber and device tracking, RAN Information Management (RIM), paging (paging), positioning, and delivery warning messages. The base stations 102 may communicate with each other directly or indirectly (e.g., through the core network 160) over a backhaul link 134 (e.g., an X2 interface). The backhaul link 134 may be wired or wireless.

The base station 102 may communicate wirelessly with the UE 104. Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, a small cell 102 'may have a coverage area 110' that overlaps with the coverage area 110 of one or more macro base stations 102. A network that includes both small cells and macro cells may be referred to as a heterogeneous network. The heterogeneous network may also include Home Evolved Node bs (enbs), which may provide services to a restricted Group called a Closed Subscriber Group (CSG). The communication link 120 between base station 102 and UE 104 may include an uplink (also referred to as reverse link) transmission from UE 104 to base station 102 and/or a downlink (also referred to as forward link) transmission from base station 102 to UE 104. Communication link 120 may use Multiple-Input Multiple-Output (MIMO) antenna techniques including spatial multiplexing, beamforming, And/or transmit diversity. The communication link may be through one or more carriers. The base station 102/UE 104 may use a spectrum up to a bandwidth of Y MHz per carrier (such as 5, 10, 15, 20, 100MHz) with carrier allocation (allocation) in carrier aggregation (carrier aggregation) for transmission in various directions, where carrier aggregation is up to a total of Yx MHz (x component carriers). The carriers may or may not be adjacent to each other. The allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL). The component carriers may include a primary component carrier and one or more secondary component carriers. A Primary component carrier may be referred to as a Primary Cell (PCell), and a Secondary component carrier may be referred to as a Secondary Cell (SCell).

The wireless communication system may also include a Wi-Fi Access Point (AP) 150 that communicates with a Wi-Fi Station (Station) 152 via a communication link 154 at 5GHz unlicensed frequency spectrum (unlicensed spectrum). When communicating in the unlicensed spectrum, the STA 152/AP 150 may perform a Clear Channel Assessment (CCA) to determine whether a Channel is available prior to communicating.

The small cell 102' may operate in a licensed spectrum and/or an unlicensed spectrum. When operating in unlicensed spectrum, the small cell 102' may employ NR and use the same 5GHz unlicensed spectrum as used by the Wi-Fi AP 150. Small cells 102' employing NR in unlicensed spectrum may improve coverage and/or increase capacity of the access network.

In communicating with the UE 104, the gsdeb (gnb)180 may operate at Millimeter Wave (mmW) frequencies and/or near mmW frequencies. When gNB180 operates at mmW or near mmW frequencies, gNB180 may be referred to as a mmW base station. An Extremely High Frequency (EHF) is a portion of the Radio Frequency (RF) in the electromagnetic spectrum. The EHF has a range of 30GHz to 300GHz and a wavelength between 1 millimeter and 10 millimeters. The radio waves in this frequency band may be referred to as millimeter waves. Near mmW may extend down to a frequency of 3GHz at a wavelength of 100 mm. The ultra high Frequency (SHF) band extends between 3GHz and 30GHz, also known as centimeter waves. Communications using the mmW/near mmW radio frequency band have extremely high path loss and short range. The mmW base station 180 may utilize beamforming 184 with the UE 104 to compensate for extremely high path loss and short distances.

The core network 160 may include: mobility Management Entity (MME) 162, other MMEs 164, serving gateway (serving gateway)166, MBMS gateway 168, Broadcast Multicast Service Center (BM-SC) 170, and Packet Data Network (PDN) gateway 172. MME 162 may communicate with a Home Subscriber Server (HSS) 174. The MME 162 is a control node that handles signaling between the UE 104 and the core network 160. Generally, the MME 162 provides bearer (bearer) and connection management. All user Internet Protocol (IP) packets (packets) are delivered through the serving gateway 166 (which is itself connected to the PDN gateway 172). The PDN gateway 172 provides UE IP address allocation as well as other functions. The PDN gateway 172 and BM-SC 170 are connected to an IP service 176. The IP services 176 may include the internet, an enterprise intranet, an IP Multimedia Subsystem (IMS), a Packet-Switched Streaming Service (PSS), and/or other IP services. The BM-SC 170 may provide functionality for MBMS user service provisioning and delivery. The BM-SC 170 may serve as an entry point for content provider MBMS delivery, may serve to authorize and initiate MBMS bearer services within a Public Land Mobile Network (PLMN), and may serve to schedule MBMS delivery. The MBMS gateway 168 may be used to allocate MBMS traffic to base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a specific service, and may be responsible for session management (start/stop) and for collecting evolved MBMS (eMBMS) related charging information.

A base station may also be referred to as a gNB, a node B, an evolved node B (enb), an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a Basic Service Set (BSS), an Extended Service Set (ESS), or some other suitable terminology. The base station 102 provides an access point for the UE 104 to the core network 160. Examples of the UE 104 include: a cellular phone, a smart phone, a Session Initiation Protocol (SIP) phone, a laptop, a Personal Digital Assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electricity meter, an air pump, an oven, or any other similar functioning device. Some of the UEs 104 may be referred to as IoT devices (e.g., parking meters, gas pumps, ovens, vehicles, etc.). The UE 104 may also be referred to as a station (station), a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.

Fig. 2 is a block diagram of a base station 210 in communication with a UE 250 in an access network. In the DL, IP packets from the core network 160 may be provided to the controller/processor 275. The controller/processor 275 performs layer 3 and layer 2 functions. Layer 3 includes a Radio Resource Control (RRC) layer, and layer 2 includes: a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, and a Medium Access Control (MAC) layer. The controller/processor 275 provides: RRC layer functions associated with system Information (e.g., Master Information Block (MIB), broadcast of System Information Block (SIB)), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter-Radio Access Technology (RAT) mobility, and measurement configuration for UE measurement result reporting; PDCP layer functions associated with header compression/decompression, security (ciphering, deciphering, integrity protection, integrity verification), and handover support functions; RLC layer functions associated with delivery of upper layer Packet Data Units (PDUs), error correction, concatenation, segmentation, and reassembly of RLC Service Data Units (SDUs) by Automatic Repeat-reQuest (ARQ), re-segmentation of RLC Data PDUs, and re-ordering of RLC Data PDUs; and MAC layer functions associated with mapping between logical channels and Transport channels, multiplexing of MAC SDUs onto Transport Blocks (TBs), demultiplexing from TBs to MAC SDUs, scheduling information reporting, error correction by Hybrid Automatic Repeat reQuest (HARQ), priority processing, and logical channel prioritization.

A Transmit (TX) processor 216 and a Receive (RX) processor 270 implement layer 1 functions associated with various signal processing functions. Layer 1, which includes a Physical (PHY) layer, may include: error detection on the transport channel, Forward Error Correction (FEC) encoding/decoding of the transport channel, interleaving, rate matching, mapping to physical channels, modulation/demodulation of the physical channels, and MIMO antenna processing. The TX processor 216 processes a mapping to a constellation (constellation) based on various Modulation schemes, such as Binary Phase-Shift Keying (BPSK), Quadrature Phase-Shift Keying (QPSK), M-Phase-Shift Keying (M-PSK), M-Quadrature Amplitude Modulation (M-QAM). The coded and modulated symbols can then be split into parallel streams (parallel streams). The individual streams may then be mapped to Orthogonal Frequency Division Multiplexing (OFDM) subcarriers, multiplexed with reference signals (e.g., pilots) in the time and/or Frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to generate a physical channel carrying a time-domain OFDM symbol stream. The OFDM streams are spatially precoded to generate a plurality of spatial streams. The channel estimates from channel estimator 274 may be used to determine the coding and modulation schemes, as well as for spatial processing. The channel estimates may be derived from reference signals and/or channel condition feedback transmitted by the UE 250. Each spatial stream may then be provided to a different antenna 220 via a separate transmitter 218 TX. Each transmitter 218TX may modulate an RF carrier with a respective spatial stream for transmission.

At the UE 250, each receiver 254RX receives a signal through its respective antenna 252. Each receiver 254RX recovers information modulated onto an RF carrier and provides the information to an RX processor 256. The TX processor 268 and the RX processor 256 implement layer 1 functions associated with various signal processing functions. The RX processor 256 may perform spatial processing on the information to recover any spatial streams destined for the UE 250. If multiple spatial streams are destined for the UE 250, they may be combined into a single OFDM symbol stream by the RX processor 256. The RX processor 256 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT). The frequency domain signal comprises separate OFDM symbol streams for each subcarrier of the OFDM signal. The symbols on the various subcarriers, as well as the reference signal, are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 210. These soft decisions may be based on channel estimates computed by the channel estimator 258. The soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 210 on the physical channel. The data and control signals are then provided to a controller/processor 259, which performs the functions of layer 3 and layer 2.

The controller/processor 259 may be associated with a memory 260 that stores program codes and data. Memory 260 may be referred to as a computer-readable medium. In the UL, the controller/processor 259 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the core network 160. The controller/processor 259 is also responsible for error detection (error detection) using an Acknowledgement (ACK) and/or Negative-acknowledgement (NACK) protocol to support HARQ operations.

Similar to the functionality described in connection with the DL transmission of base station 210, controller/processor 259 provides: RRC layer functions associated with system information (e.g., MIB, SIB) acquisition, RRC connection, and measurement report; PDCP layer functions associated with header compression/decompression and security (ciphering, deciphering, integrity protection, integrity verification); RLC layer functions associated with delivery of upper layer PDUs, error correction by ARQ, concatenation, segmentation and reassembly of RLC SDUs, re-segmentation of RLC data PDUs and re-ordering of RLC data PDUs; and MAC layer functions associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing from TB to MAC SDUs, scheduling information reporting, error correction by HARQ, priority handling, and logical channel prioritization.

Channel estimates, derived by the channel estimator 258 from reference signals or feedback transmitted by the base station 210, may be used by the TX processor 268 to select the appropriate coding and modulation schemes and to facilitate spatial processing. The spatial streams generated by the TX processor 268 may be provided to different antennas 252 via separate transmitters 254 TX. Each transmitter 254TX may modulate an RF carrier with a respective spatial stream for transmission. The UL transmissions are processed at the base station 210 in a manner similar to that described in connection with the receiver function at the UE 250. Each receiver 218RX receives a signal through its respective antenna 220. Each receiver 218RX recovers information modulated onto an RF carrier and provides the information to an RX processor 270.

The controller/processor 275 can be associated with a memory 276 that stores program codes and data. Memory 276 may be referred to as a computer-readable medium. In the UL, the controller/processor 275 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE 250. IP packets from the controller/processor 275 may be provided to the core network 160. The controller/processor 275 is also responsible for error detection using ACK and/or NACK protocols to support HARQ operations.

NR may refer to a radio technology configured to operate according to a new air interface (e.g., other than an OFDMA-based air interface) or a fixed transport layer (e.g., other than IP). The NR may utilize OFDM with Cyclic Prefix (CP) on uplink and downlink, and may include support for half duplex operation using Time Division Duplexing (TDD). NR may include: enhanced Mobile Broadband (eMBB) services targeting wide bandwidths (e.g., over 80MHz), millimeter waves (mmW) targeting high carrier frequencies (e.g., 60GHz), mass Machine Type Communication (MTC) for non-backward compatible (non-backward compatible) MTC technologies, and/or critical tasks targeting Ultra-Reliable Low Latency Communication (URLLC) services.

A single component carrier bandwidth of 100MHz may be supported. In one example, a NR Resource Block (RB) may span 12 subcarriers, have a subcarrier bandwidth of 60kHz over 0.125ms duration, or have a bandwidth of 15kHz over 0.5ms duration. Each radio frame may include 20 or 80 subframes (or NR slots), which may be 10ms in length. Each subframe may indicate a link direction (i.e., DL or UL) of data transmission, and the link direction of each subframe may be dynamically switched. Each subframe may include DL/UL data as well as DL/UL control data. The UL and DL subframes of the NR may be described in more detail as follows with reference to fig. 5 and 6.

The NR RAN may include a Central Unit (CU) and a Distributed Unit (DU). An NR BS (e.g., a gNB, a 5G node B, a Transmission Reception Point (TRP), an access Point) may correspond to one or more BSs. The NR Cell may be configured as an Access Cell (ACell) or a Data Only Cell (DCell). For example, the RAN (e.g., a central unit or a distributed unit) may configure the cells. The DCell may be a cell for carrier aggregation or dual connectivity and may not be used for initial access, cell selection/reselection, or handover. In some cases, the DCell may not transmit a Synchronization Signal (SS), and in some cases, the DCell may transmit the SS. The NR BS may transmit a downlink signal indicating (indication) a cell type to the UE. Based on the cell type indication, the UE may communicate with the NR BS. For example, the UE may determine an NR BS to consider for cell selection, access, handover, and/or measurement based on the indicated cell type.

Fig. 3 illustrates an example logical architecture 300 of a distributed RAN in accordance with aspects of the present invention. The 5G Access Node 306 may include an Access Node Controller (ANC) 302. The ANC may be a Central Unit (CU) of the distributed RAN 300. The backhaul interface of the Next Generation Core Network (NG-CN) 404 may terminate at the ANC. The backhaul interface of the neighboring Next Generation Access Node (NG-AN) may terminate at ANC. An ANC may include one or more TRPs 308 (which may also be referred to as a BS, NR BS, node B, 5G NB, AP, or some other terminology). As described above, TRP may be used interchangeably with "cell".

TRP308 may be a Distributed Unit (DU). A TRP may be attached to one ANC (ANC 302) or more than one ANC (not illustrated). For example, for RAN sharing, Radio as a Service (RaaS) AND Service specific AND deployments, a TRP may be connected to more than one ANC. The TRP may include one or more antenna ports. The TRP may be configured to provide traffic to the UE either individually (e.g., dynamic selection) or jointly (e.g., joint transmission).

The local architecture of the distributed RAN 300 may be used to instantiate the fronthaul (frontaul) definition. The architecture may be defined to support a fronthaul solution across different deployment types. For example, the architecture may be based on transport network capabilities (e.g., bandwidth, delay, and/or jitter). The architecture may share features and/or components with LTE. According to aspects, the NG-AN310 may support dual connectivity with NRs. The NG-ANs may share a common fronthaul for LTE and NR.

The architecture may enable collaboration between TRPs 308. For example, cooperation may be preset within and/or across the TRP via the ANC 302. According to aspects, an inter-TRP interface may not be required/present.

According to aspects, dynamic configuration of the split logical functions may exist within the architecture of the distributed RAN 300. The PDCP, RLC, MAC protocols may be placed adaptively at ANC or TRP.

Fig. 4 illustrates an example physical architecture 400 of a distributed RAN in accordance with aspects of the present invention. A Centralized Core Network Unit (C-CU) 402 may host (host) Core Network functions. The C-CUs may be deployed centrally. To handle peak capacity, the C-CU function may be offloaded (offload), such as to Advanced Wireless Service (AWS). A Centralized RAN Unit (C-RU) 404 may host one or more ANC functions. Alternatively, the C-RU may host the core network functions locally. The C-RU may have a distributed deployment. The C-RU may be closer to the network edge. A Distributed Unit (DU)406 may host one or more TRPs. The DUs may be located at the edge of the RF-enabled network.

Fig. 5 is a diagram 500 illustrating an example of a DL center subframe. The DL center subframe may include a control portion 502. The control portion 502 may exist in an initial or beginning portion of the DL center subframe. The control section 502 may include: various scheduling information and/or control information corresponding to portions of the DL center subframe. In some configurations, as shown in fig. 5, the Control portion 502 may be a Physical Downlink Control Channel (PDCCH). The DL center subframe may also include a DL data portion 504. The DL data portion 504 may sometimes be referred to as the payload (payload) of the DL center subframe. The DL data section 504 may include communication resources for transmitting DL data from a scheduling entity (e.g., a UE or a BS) to a subordinate entity (e.g., a UE). In some configurations, the DL data portion 504 may be a Physical Downlink Shared Channel (PDSCH).

The DL center subframe may also include a common UL portion 506. Common UL portion 506 may sometimes be referred to as a UL burst (burst), a common UL burst, and/or various other suitable terms. The common UL portion 506 may include feedback information corresponding to various other portions of the DL center subframe. For example, common UL portion 506 may include feedback information corresponding to control portion 502. Non-limiting examples of feedback information may include: an ACK signal, a NACK signal, a HARQ indicator, and/or various other suitable types of information. The common UL section 506 may include additional or additional information such as information related to Random Access Channel (RACH) procedures, scheduling requests, and various other suitable types of information.

As shown in fig. 5, the end of the DL data portion 504 may be separated in time from the beginning of the common UL portion 506. Such time separation may sometimes be referred to as a gap (gap), guard period (guard period), guard interval, and/or various other suitable terms. The separation may provide a time for switching from DL communication (e.g., a receive operation by a subordinate entity (e.g., a UE)) to UL communication (e.g., a transmission by a subordinate entity (e.g., a UE)). It will be appreciated by those of ordinary skill in the art that the foregoing is merely one example of a DL center subframe and that additional structures having similar features may exist without necessarily departing from the described aspects of the invention.

Fig. 6 is a diagram 600 illustrating an example of a UL center subframe. The UL center subframe may include a control portion 602. The control portion 602 may be present in an initial or beginning portion of the UL center subframe. The control portion 602 in fig. 6 may be similar to the control portion 502 described above with reference to fig. 5. The UL center subframe may also include an UL data portion 604. The UL data portion 604 may sometimes be referred to as the payload of the UL center subframe. The UL section may refer to a communication resource for transmitting UL data from a subordinate entity (e.g., a UE) to a scheduling entity (e.g., a UE or a BS). In some configurations, the control portion 602 may be a PDCCH.

As shown in fig. 6, the end of the control portion 602 may be separated in time from the beginning of the UL data portion 604. Such time separation (time separation) may sometimes be referred to as a gap, guard period, guard interval, and/or various other suitable terms. The separation provides time for switching from DL communication (e.g., a receive operation by the scheduling entity) to UL communication (e.g., a transmission by the scheduling entity). The UL center subframe may also include a common UL portion 606. The common UL portion 606 in fig. 6 may be similar to the common UL portion 606 described above with reference to fig. 6. The common UL portion 606 may additionally or alternatively include: information on a Channel Quality Indicator (CQI), a Sounding Reference Signal (SRS), and various other suitable types of information. It will be appreciated by those of ordinary skill in the art that the foregoing is merely one example of a UL center subframe and that additional structures having similar features may exist without necessarily departing from aspects described herein.

In some cases, two or more subordinate entities (e.g., UEs) may communicate with each other using sidelink (sidelink) signals. Realistic applications of such side-chain communication may include: public safety, proximity services (proximity services), UE-To-network relays, Vehicle-To-Vehicle (V2V) communications, Internet of everything (IoE) communications, IoT communications, mission-critical mesh (mission-critical mesh), and/or various other suitable applications. In general, a sidelink signal may refer to a signal communicated from one subordinate entity (such as UE1) to another subordinate entity (such as UE2) that does not relay the communication through a scheduling entity (such as a UE or BS), even though the scheduling entity may be used for scheduling and/or control purposes. In some examples, the sidechain signals may be transmitted using licensed spectrum (as opposed to wireless local area networks that typically use unlicensed spectrum).

Fig. 7 is a diagram 700 illustrating uplink transmission at a UE 704. In this example, the UE 704 may operate antenna ports (antenna ports) 722-1, 722-2, 722-3, 722-4 to transmit signals. The antenna ports 722-1, 722-2, 722-3, and 722-4 may be connected to transmission chains (transmission chains) 730-1, 730-2, 730-3, and 730-4, respectively. In particular, in the transmit chain 730-1, the baseband component 732-1 may generate a baseband signal, which may then be modulated by the modulator 734-1. The modulated signals (modulated signals) from 734-1, 734-2, 734-3, and 734-4 may be transmitted to a precoding unit 735-1. The signal generated from the precoding unit 735-1 may be amplified by a Power Amplifier (PA) 736-1, and the Power Amplifier 736-1 may then transmit the amplified signal to the antenna port 722-1. Similarly, the transmission chain 730-2 may include: baseband component 732-2, modulator 734-2, precoding unit 735-2, and power amplifier 736-2; the conveyor chain 730-3 may include: baseband component 732-3, modulator 734-3, precoder 735-3, and power amplifier 736-3; the conveyor chain 730-4 may include: baseband component 732-4, modulator 734-4, precoding unit 735-4, and power amplifier 736-4.

The UE 704 may operate the antenna ports 722-1, 722-2, 722-3, 722-4 based on the capabilities of the UE 704 and perform fully coherent, partially coherent, or non-coherent transmissions. When the UE 704 may maintain the phase relationship of the antenna ports 722-1, 722-2, 722-3, 722-4 for a predetermined time period (time period), the antenna ports 722-1, 722-2, 722-3, 722-4 may perform fully coherent transmission. When the UE 704 may only maintain the phase relationship of some (but not all) of the antenna ports 722-1, 722-2, 722-3, 722-4 for a predetermined period of time, the antenna ports 722-1, 722-2, 722-3, 722-4 may perform partially coherent transmission. The antenna ports 722-1, 722-2, 722-3, 722-4 may perform non-coherent transmission when the UE 704 is unable to maintain the phase relationship of any two of the antenna ports 722-1, 722-2, 722-3, 722-4 for a predetermined period of time. If the UE is equipped (eq) with 2 transmit chains, the UE capability with both fully coherent and non-coherent transmissions may be defined in a similar manner as a UE equipped with 4 transmit chains.

The UE 704 may also report to the base station 702 the capability of the UE 704 to support coherent transmission. For example, the UE 704 may indicate to the base station 702 through signaling (signaling) that the UE 704 supports fully coherent transmission, partially coherent transmission, or only non-coherent transmission.

Fig. 8 is a diagram 800 illustrating a codebook including codewords having indexes of 0 to 27, which may be used by the precoding units 735-1, 735-2, 735-3, 735-4 in a single layer (i.e., rank 1) with 4 antenna ports. Similarly, the codebooks may be used for rank 2, rank 3, and rank 4 as well.

Fig. 9A shows a table 900 listing the number of codewords allocated for full coherent, partially coherent, and non-coherent transmissions for rank 1, rank 2, rank 3, and rank 4 as defined by the 3GPP Rel-15 NR specification. For example, in rank 1, 16 codewords are allocated to full coherent transmission; allocating 8 codewords to the partially coherent transmission; 4 codewords are allocated to the non-coherent transmission.

Furthermore, partially coherent transmission may also use codewords assigned to non-coherent transmission; fully coherent transmission may also use codewords assigned to non-coherent and partially coherent transmission.

Fig. 9B shows a table 950 listing the number of codewords available for fully coherent transmission, partially coherent transmission, and non-coherent transmission. For example, in rank 1, 28 codewords may be used for fully coherent transmission; 12 codewords may be used for partial coherent transmission; 4 codewords may be used for non-coherent transmission.

The UE 704 may also report its capability to support full transmit power uplink transmissions. For example, in some configurations, the UE 704 may indicate to the base station 702 that power amplifiers in various transmit chains of the UE 704 support full transmit power uplink transmission. In some configurations, the UE 704 may indicate that no power amplifier in the UE 704 supports full transmit power uplink transmission. In some configurations, the UE 704 may indicate that only power amplifiers in a subset of the transmit chains support full transmit power uplink transmission.

In this example, when antenna ports 722-1, 722-2, 722-3, 722-4 can only perform non-coherent transmission, base station 702 can transmit signaling (e.g., via Downlink Control Information (DCI) in the PDCCH) to UE 704 to indicate the index number of one of codewords 0-3 in codebook 800. It can also be said that codebook 800 can be limited to a subset of 4 codewords available for use by UE 704. Each codeword may be represented by a 4 x 1 matrix. Each row (row) may represent an adjustment (adjust) to be made to a signal to be transmitted to a particular antenna port. In this example, the first row may correspond to antenna port 722-1, the second row may correspond to antenna port 722-2, and so on.

As shown in fig. 8, each of the codewords 0 to 3 has only 1 row which is not zero. This may indicate that only 1 antenna port may transmit signals when the antenna ports 722-1, 722-2, 722-3, 722-4 are incoherent.

Antenna ports 722-1, 722-2, 722-3, 722-4 may be grouped into 2 groups. Antenna port 722-1 and antenna port 722-2 may form a first group. Antenna port 722-3 and antenna port 722-4 may form a second group. As described above, each of the antenna ports 722-1, 722-2, 722-3, 722-4 may be connected with a respective transmit chain.

In a first configuration of the UE 704, only one transmit chain in a group has a power amplifier with a power greater than or equal to a predetermined threshold (i.e., full transmit power). In this example, the threshold is 23 dBm. More specifically, power amplifier 736-1 in transmit chain 730-1 may have a power of 23 dBm. The power amplifier 736-3 in the transmit chain 730-3 may have a power of 23 dBm. The other power amplifiers (i.e., power amplifier 736-2 and power amplifier 736-4) may have a power of 17 dBm.

In one scenario, the UE 704 may prepare to transmit an uplink channel to the base station 702. Further, the base station 702 may instruct the UE 704 to use codeword 1 in the codebook 800. Accordingly, only antenna port 722-2 will transmit signals carrying the uplink channel.

In a first technique, the UE 704 may generate a signal using the transmit chain 730-2 and then transmit the signal to the antenna port 722-2. When this technique is used, the signal is transmitted through antenna port 722-2 at 17dBm below the threshold (i.e., 23dBm) because the power of power amplifier 736-2 is 17 dBm.

In a second technique, the output of the power amplifier 736-1 may be connected to a switch 742-1, which switch 742-1 may switch the amplified signal to either the antenna port 722-1 or the antenna port 722-2. Upon receiving an indication from the base station 702 to apply codeword 1 to precoders 735-1, 735-2, 735-3, 735-4, the UE 704 may use the transmission chain 730-1 to generate a signal carrying the uplink channel. This signal may be amplified by a power amplifier 736-1 with a power of 23 dBm. In addition, the switch 742-1 may disconnect the power amplifier 736-1 from the antenna port 722-1 and connect the power amplifier 736-2 with the antenna port 722-2. Accordingly, the signal amplified by the power amplifier 736-1 may be transmitted by the antenna port 722-2. It can also be said that antenna port 722-2 carries signals carrying uplink channels at 23dBm of power.

Similarly, in a second technique, the output of power amplifier 736-3 may be connected to switch 742-2, which switch 742-2 may switch the amplified signal to either antenna port 722-3 or antenna port 722-4.

In a second scenario, base station 702 may transmit an indication instructing UE 704 to use codeword 3 in codebook 800. Accordingly, only antenna port 722-4 will transmit signals carrying the uplink channel. Upon receiving an indication from the base station 702 to apply codeword 3 to precoders 735-1, 735-2, 735-3, 735-4, the UE 704 may use the transmission chain 730-3 to generate a signal carrying an uplink channel. This signal may be amplified by a power amplifier 736-3 with a power of 23 dBm. In addition, the switch 742-2 may disconnect the power amplifier 736-3 from the antenna port 722-3 and connect the power amplifier 736-3 with the antenna port 722-4. Accordingly, the signal amplified by the power amplifier 736-3 may be transmitted through the antenna port 722-4. It can also be said that antenna port 722-4 carries signals carrying uplink channels at 23dBm of power.

In a third scenario, antenna ports 722-1, 722-2, 722-3, 722-4 may be partially coherent. Accordingly, in addition to codewords 1 through 3, the base station 702 may instruct the UE 704 to apply codewords 4 through 11 to the precoders 735-1, 735-2, 735-3, 735-4. Further, when base station 702 indicates a codeword between codewords 8-11, antenna port 722-2 and antenna port 722-4 may be used to transmit signals carrying the uplink channel. In a second technique, the UE 704 may use the transmit chain 730-1 and the transmit chain 730-3 to generate a signal carrying an uplink channel, which may be amplified by the power amplifier 736-1 and the power amplifier 736-3. Subsequently, as described above, the switch 742-1 may switch the output signal of the power amplifier 736-1 to the antenna port 722-2 and the switch 742-2 may switch the output signal of the power amplifier 736-3 to the antenna port 722-4. Thus, antenna port 722-2 and antenna port 722-4 may carry signals carrying uplink channels at 20 dBm. Thus, the total output power of the antenna ports 722-1, 722-2, 722-3, 722-4 may be equal to a threshold value (e.g., 23 dBm).

In a second configuration of the UE 704, only one of the transmit chains 730-1, 730-2, 730-3, 730-4 has a power amplifier with a power greater than or equal to a first threshold (e.g., 23dBm, which may be a full transmit power). In this example, only power amplifier 736-1 in the first group has a power of 23 dBm. Only one power amplifier in the second set has a power greater than or equal to a second threshold (e.g., 20 dBm).

In the second scenario described above, base station 702 may transmit an indication instructing UE 704 to use codeword 3 in codebook 800. Accordingly, only antenna port 722-4 will transmit signals carrying the uplink channel. In the second configuration, only power amplifier 736-1 has a power of 23 dBm.

In a third technique, switch 742-1 may connect power amplifier 736-1 to antenna port 722-3 and antenna port 722-4 in addition to antenna port 722-2. Upon receiving an indication from the base station 702 to apply codeword 3 to precoders 735-1, 735-2, 735-3, 735-4, the UE 704 may use the transmission chain 730-1 to generate a signal carrying an uplink channel. This signal may be amplified by a power amplifier 736-1 with a power of 23 dBm. In addition, the switch 742-1 may disconnect the power amplifier 736-1 from the antenna port 722-1 and connect the power amplifier 736-1 with the antenna port 722-4. Accordingly, the signal amplified by the power amplifier 736-1 may be transmitted through the antenna port 722-4. Also, antenna port 722-4 carries signals carrying uplink channels at 23dBm of power.

Similarly, when base station 702 instructs UE 704 to apply codewords 1 and 2, UE 704 may also use transmit chain 730-1 to generate a signal carrying an uplink channel and may then use switch 742-1 to switch the amplified signal to antenna port 722-2 or antenna port 722-3.

In the third scenario described above, antenna ports 722-1, 722-2, 722-3, 722-4 may be partially coherent. The base station 702 may also instruct the UE 704 to apply codewords 3 through 11 to precoders 735-1, 735-2, 735-3, 735-4. When base station 702 indicates a codeword between codewords 8-11, antenna port 722-2 and antenna port 722-4 may be used to transmit signals carrying the uplink channel. As described above, in this second configuration, power amplifier 736-1 has a power of 23dBm and power amplifier 736-3 has a power of 20 dBm.

As with the second technique, in a third technique, the switch 742-2 may switch the amplified signal from the power amplifier 736-3 to either the antenna port 722-3 or the antenna port 722-4. The UE 704 may use the transmit chain 730-1 and the transmit chain 730-3 to generate a signal carrying an uplink channel, which may be amplified by the power amplifier 736-1 and the power amplifier 736-3. Subsequently, as described above, the switch 742-1 may switch the output signal of the power amplifier 736-1 to the antenna port 722-2 and the switch 742-2 may switch the output signal of the power amplifier 736-3 to the antenna port 722-4. Thus, antenna port 722-2 and antenna port 722-4 may carry signals carrying uplink channels at 20 dBm. Thus, the total output power of the antenna ports 722-1, 722-2, 722-3, 722-4 may be equal to a first threshold (e.g., 23 dBm).

Fig. 10 is a diagram 1000 illustrating uplink transmission at a UE 1004. In this example, the UE1004 may operate antenna ports 1022-1, 1022-2, 1022-3, 1022-4 to transmit signals. Antenna ports 1022-1, 1022-2, 1022-3, 1022-4 may be connected with transmission chains 1030-1, 1030-2, 1030-3, 1030-4, respectively. In particular, in transmit chain 1030-1, baseband components 1032-1 may generate baseband signals, which may be modulated by modulator 1034-1. The modulated signal may be conveyed to a Cyclic Delay Diversity (CDD) component 1044-1, which CDD component 1044-1 may apply a Cyclic Delay to the modulated signal. The output signals of the CDD component 1044-1 may be conveyed to a precoding unit 1035-1 for precoding. The signal generated from the precoder 1035-1 may then be amplified by the power amplifier 1036-1, which may then transmit the amplified signal to the antenna port 1022-1. Similarly, transmit chain 1030-2 may include baseband components 1032-2, modulator 1034-2, CDD components 1044-2, precoding unit 1035-2, and power amplifier 1036-2; transmit chain 1030-3 may include baseband components 1032-3, modulator 1034-3, CDD components 1044-3, precoding unit 1035-3, and power amplifier 1036-3; transmit chain 1030-4 may include baseband components 1032-4, modulator 1034-4, CDD components 1044-4, precoding unit 1035-4, and power amplifier 1036-4. The CDD components shown in fig. 10 may also be omitted from the UE implementation.

The base station 1002 may signal codeword selection for each rank according to the UE 1004's ability to transmit fully coherently, partially coherently, or non-coherently through a codebook subset restriction (e.g., bitmap). Fig. 9B shows the number of codewords selected for each rank at the reported UE capability.

In this example, the UE1004 may have a configuration that supports only non-coherent uplink transmissions or partially coherent uplink transmissions, but not coherent transmissions. The base station 1002 may instruct the UE1004 to use only a subset of the codewords in the codebook 800. Accordingly, the UE1004 can determine to indicate a codeword index and accordingly an indication received from the base station 1002 can indicate a codeword in the subset. The codewords in the subset may be sequentially re-indexed such that the relevant DCI field size may not change relative to the 3GPP Rel-15 NR standard.

In this example, power amplifiers 1036-1, 1036-2, 1036-3, and 1036-4 may each have a power less than a threshold (23dBm), such as 17 dBm.

In a fourth technique, the base station 1002 may receive an indication from the UE1004 that none of the power amplifiers support full power (e.g., at 23dBm) uplink transmission. The base station 1002 may instruct the UE1004 that only a subset of the codebook 800 may be used on the precoders 1035-1, 1035-2, 1035-3, 1035-4, where the subset may include one or more fully coherent codewords, such as codeword 12, codeword 14, codeword 20, and codeword 22. For selected codewords of rank 1, the selection may be made via a bitmap (e.g., 0000000000001010000010100000), similar for selected codewords of other ranks.

Accordingly, UE1004 may re-index codewords 12, 14, 20, and 22 to new codewords 0, 1, 2, and 3. Each of the antenna ports 1022-1, 1022-2, 1022-3, 1022-4 may be used to transmit signals carrying uplink channels in accordance with the new codeword.

Base station 1002 may use indices 0 through 3 (e.g., via 2 bits) to indicate codeword 12, codeword 14, codeword 20, and codeword 22 in codebook 800 (i.e., new codeword 0, new codeword 1, new codeword 2, and new codeword 3 in the subset described above).

The UE1004 may receive the indices of the codewords in the subset and accordingly determine the codewords to apply to the precoders 1035-1, 1035-2, 1035-3, 1035-4. Since each of the antenna ports 1022-1, 1022-2, 1022-3, 1022-4 is used, the UE1004 may use each of the transmit chains 1030-1, 1030-2, 1030-3, 1030-4 to generate signals carrying uplink channels. The baseband components 1032-1, 1032-2, 1032-3, 1032-4 may generate baseband signals, which may be input to modulators 1034-1, 1034-2, 1034-3, 1034-4. In this technique, the modulated signals may be input to the CDD assemblies 1044-1, 1044-2, 1044-3, 1044-4, which may selectively apply respective cyclic delays to the respective modulated signals.

In one example, for each spatial layer (spatial layer), a first set of antenna port pairs (entries), e.g., the same coherent set (e.g., antenna port 1022-1 and antenna port 1022-3), may be transmitted simultaneously from the associated transmit chain, while other sets of antenna port pairs (e.g., antenna port 1022-2 and antenna port 1022-4) are transmitted at a different timing than the first set of antenna port pairs. More specifically, let t be_k(where 1 ≦ k ≦ 4) is the small cyclic delay introduced at the transmit chains 1030-1, 1030-2, 1030-3, 1030-4, then for the UE reporting the non-coherent transmission capability, t_m≠t_nWherein m is more than or equal to 1, n is less than or equal to 4, and m is not equal to n; for a UE reporting partial coherent transmission capability, t₁＝t₃≠t₂＝t₄。

As described above, the UE1004 may report its coherent transmission capability (non-coherent, partially coherent, fully coherent) to the network via the base station 1002. The allowed number of codewords for each rank may be looked up by the base station 1002 from the table of fig. 9B. Depending on the reported coherent transmission capabilities, a corresponding number of codewords can be selected from all codewords, which can be non-coherent, partially coherent, fully coherent codewords originally designed for a given rank (e.g., via bitmaps for the respective ranks), and the selected codewords are eligible for indication by the base station 1002 for use by the UE. More specifically, for UEs reporting non-coherent transmission capability, the codebook subset restriction or selected codeword may comprise a codeword originally designed for partially coherent transmission or fully coherent transmission; for UEs reporting partial coherent transmission capability, the codebook subset restriction or selected codeword may comprise a codeword originally designed for full coherent transmission. The base station 1002 may configure the UE to use codebook subset restriction (e.g., the selection described in the fourth technique above) in RRC signaling to the UE 1004.

The base station 1002 may also configure the UE1004 with multiple sets of codebook subset restrictions. Active codebook subset restriction can be selected at the UE1004 by using a MAC Control Element (CE). The UE1004 may receive RRC signaling for configuration of one or more codebook subset restrictions and potential MAC CE activation/selection. The codewords selected at the respective ranks may be sequentially indexed to the position of "1" in the bitmap. When the UE1004 receives the DCI, a field related to a Transmitted Precoding Matrix Indicator (TMPI) may be interpreted accordingly.

Fig. 11 is a flowchart 1100 of a method (process) of transmitting an uplink channel. The method may be performed by a UE (e.g., UE 704, device 1302, and device 1302').

In operation 1102, the UE may receive an indication from a base station to adjust transmission of an uplink channel on a plurality of antenna ports. In some configurations, the indication may indicate a codeword in a codebook that may be used by a precoder of the UE when transmitting the uplink channel through one or more of the plurality of antenna ports. In operation 1104, the UE may determine whether a first antenna port of the plurality of antenna ports is used to transmit an uplink channel and whether a second antenna port of the plurality of antenna ports is not used to transmit an uplink channel according to the adjustment. The first power amplifier is in a first transmit chain connected to the first antenna port. The maximum power of the first power amplifier is below a first threshold.

In operation 1106, the UE may connect a second power amplifier with the first antenna port when it is determined that the first antenna port is used to transmit the uplink channel and the second antenna port is not used to transmit the uplink channel. The second power amplifier is in a second transmit chain connected to the second antenna port. The maximum power of the second power amplifier is greater than or equal to a first threshold.

In some configurations, the first antenna port and the second antenna port are in a first set of antenna ports. A third antenna port and a fourth antenna port of the plurality of antenna ports are in a second set of antenna ports. In operation 1108, the UE may determine whether the third antenna port is used to transmit the uplink channel and whether the fourth antenna port is not used to transmit the uplink channel based on the adjustment. The third power amplifier is in a third transmit chain connected to a third antenna port. The maximum power of the third power amplifier is below a first threshold.

In operation 1110, the UE may connect a fourth power amplifier with the third antenna port when the third antenna port is determined to be used for transmitting the uplink channel. The fourth power amplifier is in a fourth transmit chain connected to the fourth antenna port. The maximum power of the fourth power amplifier is greater than or equal to the first threshold. In some configurations, only one of the first antenna port, the second antenna port, the third antenna port, and the fourth antenna port may be determined to be used for transmitting the uplink channel. In some configurations, one antenna port in each of the first and second groups may be determined to be used for transmitting an uplink channel.

In operation 1112, the UE may transmit an uplink channel to the base station through (a) the second power amplifier and the first antenna port at a power greater than or equal to the first threshold and/or (b) the fourth power amplifier and the third antenna port at a power greater than or equal to the first threshold.

Fig. 12 is a flowchart 1200 of a method (process) of transmitting an uplink channel. The method may be performed by a UE (e.g., UE 704, device 1302, and device 1302').

In operation 1202, a UE may report a transmit capability of the UE to a base station. In operation 1204, the UE may receive, from the base station, first signaling indicating a subset of codewords in the codebook and second signaling selecting one codeword in the subset to precode uplink channels for transmission over multiple antenna ports on one or more spatial layers. In some configurations, the second signaling may include an index referencing (refer) a codeword in the subset of codewords.

In operation 1206, the UE may determine to use individual antenna ports of the plurality of antenna ports for transmitting uplink channels according to the selected codeword. In operation 1208, when it is determined that each of the plurality of antenna ports is used for transmitting an uplink channel, the UE may apply a cyclic delay to at least one of the transmit chains connected to the plurality of antenna ports. In operation 1210, the UE may transmit an uplink channel through each of the plurality of antenna ports.

In some configurations, the reported transmit capability of the UE may indicate a non-coherent transmission. The codeword in the subset indicated by the first signaling may be a precoder of the UE, and the UE may be adjusted to transmit uplink channels of one spatial layer with non-zero power on two or more of the plurality of antenna ports. In some configurations, the reported transmit capability of the UE may indicate a partially coherent transmission. The codeword in the subset indicated by the first signaling may be a precoder of the UE, and the UE may be adjusted to transmit uplink channels of one spatial layer with non-zero power on all antenna ports of the plurality of antenna ports.

FIG. 13 is a conceptual data flow diagram 1300 illustrating the flow of data between different components/instrumentalities in an exemplary device 1302. The device 1302 may be a UE. Apparatus 1302 may include a receiving component 1304, a power determining component 1306, a connecting component 1308, a codebook restricting component 1312, and a transmitting component 1310.

In an aspect, receiving component 1304 may receive an indication from a base station to adjust transmission of uplink channels on multiple antenna ports. In some configurations, the indication may indicate a codeword in a codebook that may be used by a precoder of the UE when transmitting the uplink channel through one or more of the plurality of antenna ports. The UE may determine, based on the adjustment, whether a first antenna port of the plurality of antenna ports is used to transmit an uplink channel and whether a second antenna port of the plurality of antenna ports is not used to transmit an uplink channel. The first power amplifier is in a first transmit chain connected to the first antenna port. The maximum power of the first power amplifier is below a first threshold.

The connection component 1308 may connect the second power amplifier with the first antenna port when it is determined that the first antenna port is used to transmit the uplink channel and the second antenna port is not used to transmit the uplink channel. The second power amplifier is in a second transmit chain connected to the second antenna port. The maximum power of the second power amplifier is greater than or equal to a first threshold.

In some configurations, the first antenna port and the second antenna port are in a first set of antenna ports. A third antenna port and a fourth antenna port of the plurality of antenna ports are in a second set of antenna ports. The UE may determine from the adjustment whether the third antenna port is used to transmit the uplink channel and whether the fourth antenna port is not used to transmit the uplink channel. The third power amplifier is in a third transmit chain connected to a third antenna port. The maximum power of the third power amplifier is below a first threshold.

When the third antenna port is determined to be used for transmitting the uplink channel, the connection component 1308 may connect a fourth power amplifier with the third antenna port. The fourth power amplifier is in a fourth transmit chain connected to the fourth antenna port. The maximum power of the fourth power amplifier is greater than or equal to the first threshold. In some configurations, only one of the first antenna port, the second antenna port, the third antenna port, and the fourth antenna port may be determined to be used for transmitting the uplink channel. In some configurations, one antenna port in each of the first and second groups may be determined to be used for transmitting an uplink channel.

The transmitting component 1310 may transmit the uplink channel to the base station at (a) a power greater than or equal to the first threshold through the second power amplifier and the first antenna port and/or (b) a power greater than or equal to the first threshold through the fourth power amplifier and the third antenna port.

In another aspect, power determining component 1306 may report the transmit capabilities of the UE to base station 1350. Codebook restricting component 1312 may receive first signaling from a base station indicating a subset of codewords in a codebook and second signaling selecting one codeword in the subset to precode uplink channels for transmission over multiple antenna ports on one or more spatial layers. In some configurations, the second signaling may include an index referencing a codeword in the subset of codewords.

Power determining component 1306 may determine to use individual antenna ports of the plurality of antenna ports for transmitting uplink channels according to the selected codeword. When determining to use individual ones of the plurality of antenna ports for transmitting uplink channels, power determining component 1306 may apply a cyclic delay to at least one of the transmit chains connected to the plurality of antenna ports. The transmitting component 1310 may transmit the uplink channel through each of the plurality of antenna ports.

Fig. 14 is a diagram 1400 illustrating an example of a hardware implementation of a device 1302' employing a processing system 1414. The device 1302' may be a UE. The processing system 1414 may be implemented with a bus architecture, represented generally by the bus 1424. The bus 1424 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 1414 and the overall design constraints. The bus 1424 links together various circuits including one or more processors and/or hardware components, represented by the one or more processors 1404, reception component 1304, power determination component 1306, connection component 1308, codebook restriction component 1312, transmission component 1310, and computer-readable medium/memory 1406. The bus 1424 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits.

The processing system 1414 may be coupled (coupled) to the transceiver 1410, and the transceiver 1410 may be one or more of the transceivers 254. The transceiver 1410 may be coupled to one or more antennas 1420, which antennas 1420 may be communication antennas 252.

The transceiver 1410 may provide a means for communicating with various other apparatus over a transmission medium. The transceiver 1410 receives signals from the one or more antennas 1420, extracts information from the received signals, and provides the extracted information to the processing system 1414, which may in particular be provided to the receiving component 1304. Additionally, the transceiver 1410 receives information from the processing system 1414 (and in particular from the transmitting component 1310), and based on the received information, generates a signal that can be applied to the one or more antennas 1420.

The processing system 1414 may include one or more processors 1404 coupled to a computer-readable medium/memory 1406. The one or more processors 1404 are responsible for general processing, including the execution of software stored on the computer-readable medium/memory 1406. The software, when executed by the one or more processors 1404, may cause the processing system 1414 to perform the various functions of any particular apparatus described herein. The computer-readable medium/memory 1406 may also be used for storing data that is manipulated by the one or more processors 1404 when executing software. The processing system 1414 further includes at least one of a receiving component 1304, a power determining component 1306, a connecting component 1308, a codebook restricting component 1312, and a transmitting component 1310. The above-described components may be software components running in the one or more processors 1404 (the software components residing/stored in the computer-readable medium/memory 1406), or one or more hardware components coupled to the one or more processors 1404, or some combination thereof. The processing system 1414 may be a component of the UE 250 and may include the memory 260 and/or at least one of the TX processor 268, the RX processor 256, and the communications processor 259.

In one configuration, the apparatus 1302/1302' for wireless communication includes means for performing each of the operations of fig. 11-12. The above means may be one or more of the following: the aforementioned components of the device 1302 and/or the processing system 1414 of the device 1302' configured to perform the functions recited by the means.

As described supra, the processing system 1414 may include the TX processor 268, the RX processor 256, and the communications processor 259. Thus, in one configuration, the aforementioned means may be the TX processor 268, the RX processor 256, and the communications processor 259 configured to perform the functions recited by the aforementioned means.

Note that the particular order or hierarchy of blocks in the processes/flow diagrams of the present invention are examples of exemplary approaches. It will thus be appreciated that the particular order or hierarchy of blocks in the processes/flow diagrams can be rearranged based upon design preferences, and that some blocks may be further combined or omitted. The accompanying method claims present elements of the various blocks in a sample order, and are not meant to limit the invention to the specific order or hierarchy presented.

The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Accordingly, the claims are not intended to be limited to the aspects shown, but are to be accorded the full scope consistent with the language claims. Wherein reference to an element in the singular is not intended to mean "one and only one" unless specifically so stated, but rather "one or more. The word "exemplary" is used herein to mean "serving as an example, instance, or illustration. Any aspect of the invention described as "exemplary" is not necessarily to be construed as preferred or advantageous over other aspects. The term "some" means one or more unless specifically stated otherwise. Combinations such as "at least one of A, B or C", "one or more of A, B or C", "at least one of A, B and C", "one or more of A, B and C", and "A, B, C or any combination thereof" include any combination of A, B and/or C, and may include a plurality of a, B plurality, or C plurality. In particular, combinations such as "at least one of A, B or C", "one or more of A, B or C", "at least one of A, B and C", "one or more of A, B and C", and "A, B, C or any combination thereof" may be a only, B only, C only, a and B inclusive, a and C inclusive, B and C inclusive, or a and B and C inclusive, where any such combination may include A, B or one or more of C. All structural and functional equivalents to the elements of the various aspects described herein that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Furthermore, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The words "module," mechanism, "" element, "" device, "and the like may not be alternatives to the word" means. Thus, unless the phrase "means for …" is used to specifically state an element in a claim, that element should not be construed as a functional limitation.

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UL transmission with full TX power at UE

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