Method and apparatus for multi-layer data transmission
阅读说明:本技术 用于多层数据传输的方法和装置 (Method and apparatus for multi-layer data transmission ) 是由 纵金榜 田力 曹伟 袁志锋 袁弋非 于 2018-02-09 设计创作,主要内容包括:公开了一种用于生成扩展序列码本的方法和装置。在一个实施例中,一种由无线通信设备执行的方法包含:将参考信号传送到无线通信设备;接收来自所述无线通信设备的信道质量指示符(CQI)信号;基于至少所述CQI信号,确定来自用于所述无线通信设备的第一MCS表的调制编码方案(MCS)索引;以及接收来自所述无线通信设备的第一上行链路传输数据集。(A method and apparatus for generating a spreading sequence codebook is disclosed. In one embodiment, a method performed by a wireless communication device includes: transmitting a reference signal to a wireless communication device; receiving a Channel Quality Indicator (CQI) signal from the wireless communication device; determining a Modulation Coding Scheme (MCS) index from a first MCS table for the wireless communication device based on at least the CQI signal; and receiving a first set of uplink transmission data from the wireless communication device.)
1. A method performed by a wireless communication node, the method comprising:
transmitting a reference signal to a wireless communication device;
receiving a Channel Quality Indicator (CQI) signal from the wireless communication device;
determining a Modulation Coding Scheme (MCS) index from a first Modulation Coding Scheme (MCS) table for the wireless communication device based on at least the CQI signal; and
a first set of uplink transmission data is received from the wireless communication device.
2. The method of claim 1, wherein the first uplink transmission data set results from dividing a second uplink transmission data set into a predetermined number of data segments on a predetermined number of data layers, respectively, and processed by at least one process, wherein the predetermined number of data layers are each configured by a first modulation order and a corresponding second modulation order in the first MCS table.
3. The method of claim 1, further comprising:
selecting the first MCS table from at least one MCS table based on at least the CQI signal; and
transmitting the MCS index to the wireless communication device for future uplink transmissions.
4. The method of claim 2, wherein the first modulation order is less than or equal to the corresponding second modulation order.
5. The method of claim 2, wherein the first modulation order QnIs based on Qn=Qm/NLayer(s)Is arranged wherein QnFor said first modulation order, QmIs the corresponding second modulation order, and NLayer(s)For a predefined number of data layers, Qn、QmAnd NLayer(s)Is a positive integer.
6. The method of claim 2, wherein the at least one procedure is performed before or after dividing the second uplink transmission data set into a predetermined number of data segments on a predetermined number of data layers.
7. The method of claim 2, wherein the at least one process comprises at least one of: channel coding, scrambling, modulation, sequence spreading, layer mapping, and data segment stacking.
8. The method of claim 1, wherein the first uplink transmission data set is transmitted according to a first transmission configuration, wherein the first transmission configuration includes at least one of: the first modulation order and a predefined number of data layers.
9. The method of claim 8, wherein the first transmission configuration is determined based on the MCS index and the first MCS table.
10. The method of claim 1, wherein the first MCS table is selected from at least one MCS table according to at least the CQI signal.
11. A method performed by a wireless communication device, the method comprising:
generating a Channel Quality Indicator (CQI) signal based on a reference signal received from a wireless communication node;
receiving, from the wireless communication node, a Modulation Coding Scheme (MCS) index in a first MCS table for future uplink transmissions; and
transmitting a first set of uplink transmission data to the wireless communication node.
12. The method of claim 11, further comprising:
dividing the second uplink transmission data set into a predetermined number of data segments on a predetermined number of data layers; and
processing the predetermined number of data segments to form the first uplink transmission data set;
wherein the predetermined number of data layers is configured by a first modulation order and a corresponding second modulation order in the first MCS table.
13. The method of claim 12, wherein the first modulation order is less than or equal to the corresponding second modulation order.
14. The method of claim 12, wherein the first modulation order QnIs based on Qn=Qm/NLayer(s)Is arranged wherein QnFor said first modulation order, QmIs the corresponding second modulation order, and NLayer(s)For a predefined number of data layers, Qn、QmAnd NLayer(s)Is a positive integer.
15. The method of claim 12, wherein the processing comprises at least one of: channel coding, scrambling, modulation, sequence spreading, layer mapping, and data segment stacking.
16. The method of claim 11, wherein the first set of uplink transmission data is transmitted according to a first transmission configuration, wherein the first transmission configuration comprises the first modulation order and a predefined number of data layers.
17. The method of claim 16, wherein the first transmission configuration is determined based on the MCS index and the first MCS table.
18. The method of claim 11, wherein the first MCS table is selected from at least one MCS table according to at least the CQI signal.
19. A method performed by a wireless communication node, the method comprising:
receiving a first uplink transmission data set and a first processing configuration from a wireless communication device;
wherein the first uplink transmission data set results from dividing a second uplink transmission data set into a predetermined number of data segments, each on a predetermined number of data layers, and is processed by at least one process, wherein the first processing configuration comprises a predefined number of data layers and a first modulation order, and wherein the predetermined number of data layers is transmitted from the wireless communication device using one of: explicit indication and implicit indication.
20. The method of claim 19, wherein the processing comprises at least one of: channel coding, scrambling, modulation, sequence spreading, layer mapping, and data segment stacking.
21. The method of claim 19, wherein the first processing configuration further comprises a set of spreading sequences and a random phase vector.
22. The method of claim 19, wherein the predetermined number of data layers is configured according to the first modulation order and a corresponding second modulation order.
23. The method of claim 19, wherein the first modulation order QnIs based on Qn=Qm/NLayer(s)Is arranged wherein QnFor said first modulation order, QmIs the corresponding second modulation order, and NLayer(s)For a predefined number of data layers, Qn,QmAnd NLayer(s)Is a positive integer.
24. The method of claim 19, wherein the explicit indication is carried by Uplink Control Information (UCI).
25. The method of claim 19, wherein the implicit indication is carried by one of: zadoff-chu (zc) root sequence, reference signal sequence after cyclic shift operation, Orthogonal Cover Code (OCC), comb structure, radio network temporary id (rnti), time-frequency resource, and demodulation reference signal (DMRS).
26. A method performed by a wireless communication device, the method comprising:
dividing the first uplink transmission data set into a predetermined number of data segments on a predetermined number of data layers, respectively;
processing the predetermined number of data segments on the predetermined number of data layers according to a first processing configuration to form a second uplink transmission data set; and
transmitting the second uplink transmission data set and the first processing configuration to a wireless communication node;
wherein the first processing configuration comprises the predetermined number of data layers, and wherein the predetermined number of data layers is communicated to the wireless communication node using one of: explicit indication and implicit indication.
27. The method of claim 26, wherein the processing comprises at least one of: channel coding, scrambling, modulation, sequence spreading, layer mapping, and data segment stacking.
28. The method of claim 26, wherein the first processing configuration further comprises a set of spreading sequences and a random phase vector.
29. The method of claim 26, wherein the transmitting is performed according to a first transmission configuration, wherein the first transmission configuration comprises a first modulation order and a predefined number of data layers.
30. The method of claim 26, wherein the predetermined number of data layers is configured according to the first modulation order and a corresponding second modulation order.
31. The method of claim 26, wherein the first modulation order QnIs based on Qn=Qm/NLayer(s)Is arranged wherein QnFor said first modulation order, QmIs the corresponding second modulation order, and NLayer(s)For a predefined number of data layers, Qn、QmAnd NLayer(s)Is a positive integer.
32. The method of claim 26, wherein the explicit indication is carried by Uplink Control Information (UCI).
33. The method of claim 26, wherein the implicit indication is carried by one of: zadoff-chu (zc) root sequence, reference signal sequence after cyclic shift operation, Orthogonal Cover Code (OCC), comb structure, radio network temporary id (rnti), time-frequency resource, and demodulation reference signal (DMRS).
34. A computing device configured to perform the method of any of claims 1-33.
35. A non-transitory computer readable medium having stored thereon computer executable instructions for performing the method of any one of claims 1 to 33.
Technical Field
The present disclosure relates generally to wireless communications, and more particularly to a method and apparatus for multi-layer data transmission.
Background
In the past decades, mobile communication has evolved from voice service to high-speed broadband data service. With the further development of new services and applications, such as enhanced mobile broadband (eMBB), large-scale machine type communication (mtc), ultra-reliable low latency communication (URLLC), etc., the demand for high performance data transmission over mobile networks will continue to grow exponentially. Based on the specific requirements for these emerging services, wireless communication systems should meet various requirements, such as throughput, latency, data rate, capacity, reliability, link density, cost, energy consumption, complexity, and coverage.
Disclosure of Invention
The exemplary embodiments disclosed herein are intended to solve the problems associated with one or more of the problems presented in the prior art and to provide additional features that will be readily understood by reference to the following detailed description in conjunction with the accompanying drawings. In accordance with some embodiments, exemplary systems, methods, and computer program products are disclosed herein. It is to be understood, however, that these embodiments are presented by way of example, and not limitation, and that various modifications to the disclosed embodiments may be apparent to those skilled in the art upon reading this disclosure, while remaining within the scope of the invention.
Conventional methods relying on random access by user terminals and scheduled data transmission between a base station and user terminals do not provide satisfactory performance for the aforementioned services due to limited device capacity, high latency and high signaling overhead. To meet these demands in 5G/NR (new radio) communications, a contention-based unlicensed data transmission method is being considered. The grant-free data transmission method refers to a method in which a transmitting user terminal can perform autonomous data transmission without transmitting a scheduling request signal to a base station or acquiring a dynamic grant signal from the base station. Advantages of the grant-free data transmission method include reduced signaling overhead, reduced terminal power consumption, and reduced latency, among others.
The unlicensed method may be an orthogonal or non-orthogonal resource allocation technique. In the orthogonal resource allocation technique, although the resources themselves are orthogonal, different user terminals may randomly select the same resource for data transmission, resulting in "collisions". When collisions occur, channel performance can be significantly affected. Therefore, the orthogonal grant-free resource allocation scheme is not efficient in terms of resource usage. On the other hand, the non-orthogonal grant-free resource allocation scheme based on sequence spreading enables processing of data at the transmitting user terminal and uses advanced receivers at the base station, which can efficiently handle scenarios such as multi-user overlap or collision without compromising channel performance. For example, if modulated data from a transmitting user terminal can be spread to the symbol level by a low correlation spreading sequence, the probability of collision can be controlled to a significantly lower level even in the case of overlapping transmissions on the same resource from multiple user terminals or different user terminals using the same spreading sequence. In addition, the low correlation spreading sequences may also reduce multi-user interference, enhance system capacity, and may also reduce the complexity of the receiver at the base station.
Quadrature amplitude modulation, or "QAM," is a form of modulation that is widely used to modulate data signals onto a carrier for wireless communications. QAM is widely used because it offers advantages over other forms of data modulation such as Phase Shift Keying (PSK). An advantage of moving to higher order QAM (e.g., 256QAM or higher) is that there are more points in the constellation, thereby transmitting more bits per symbol more efficiently, resulting in higher bandwidth efficiency. For example, from 16QAM to 256QAM, the constellation points increase from 16 points to 256 points, and the theoretical bandwidth efficiency increases from 4 times to 8 times.
The disadvantage is that the constellation points are closer together and therefore the link is more susceptible to noise. Furthermore, another disadvantage of using higher modulation is due to a higher demodulation threshold resulting in a loss of transmission performance. Therefore, there is a need to develop a new method that supports high bandwidth efficiency and high code rate for both orthogonal and non-orthogonal resource allocation at lower modulation orders.
In one embodiment, a method performed by a wireless communication node comprises: transmitting a reference signal to a wireless communication device; receiving a Channel Quality Indicator (CQI) signal from the wireless communication device; determining a Modulation and Coding Scheme (MCS) index from a first MCS table for the wireless communication device based on at least the CQI signal; and receiving a first set of uplink transmission data from the wireless communication device.
In another embodiment, a method performed by a wireless communication device includes: generating a Channel Quality Indicator (CQI) signal based on a reference signal received from a wireless communication node; receiving, from the wireless communication node, a Modulation and Coding Scheme (MCS) index in a first MCS table for future uplink transmissions; transmitting a first set of uplink transmission data to the wireless communication node.
In yet another embodiment, a method performed by a wireless communication device includes: receiving a first uplink transmission data set and a first processing configuration from a wireless communication device, wherein the first uplink transmission data set is derived from dividing a second uplink transmission data set into a predetermined number of data segments on a predetermined number of data layers, respectively, and is processed by at least one process, wherein the first processing configuration contains the predetermined number of data layers and a first modulation order, and wherein the predetermined number of data layers is transmitted from the wireless communication device using one of: explicit indication and implicit indication.
In yet another embodiment, a method performed by a wireless communication node comprises: dividing the first uplink transmission data set into a predetermined number of data segments on a predetermined number of data layers, respectively; processing the predetermined number of data segments on the predetermined number of data layers according to a first processing configuration to form a second uplink transmission data set; and transmitting the second uplink transmission data set and the first processing configuration to a wireless communication node, wherein the first processing configuration contains the predetermined number of data layers, and wherein the predetermined number of data layers is transmitted to the wireless communication node using one of: explicit indication and implicit indication.
Drawings
Various aspects of this disclosure are best understood from the following detailed description when read with the accompanying drawing figures. It should be noted that the various features are not necessarily drawn to scale. In fact, the dimensions and geometries of the various features may be arbitrarily increased or decreased for clarity of discussion.
Fig. 1A illustrates an example wireless communication network showing achievable modulation as a function of distance from a BS in accordance with some embodiments of the present disclosure;
fig. 1B illustrates a block diagram of an example wireless communication system for slot structure information indication, in accordance with some embodiments of the present disclosure;
fig. 2 illustrates an exemplary conventional 64QAM CQI table with 16 entries or index values in accordance with some embodiments of the present disclosure;
FIG. 3 illustrates an exemplary conventional 64QAMMCS with 32 entries or index values according to some embodiments of the present disclosure;
4A-4C illustrate 3 exemplary modified 64QAM MCS tables with 32 entries or index values according to some embodiments of the present disclosure;
fig. 5A illustrates a method of performing uplink multi-layer data transmission in a grant-based scenario, in accordance with some embodiments of the present disclosure;
fig. 5B illustrates a method of performing multi-layer uplink transmission in an unlicensed scenario, in accordance with some embodiments of the present disclosure;
fig. 6 illustrates an exemplary data processing diagram showing processing performed by a UE after receiving scheduling information from a BS, in accordance with some embodiments of the present disclosure;
fig. 7A illustrates an implicit indication of a number of data layers using a Zadoff-chu (zc) root sequence, according to some embodiments of the present disclosure;
FIG. 7B illustrates an implicit indication of the number of data layers using time-frequency resources, in accordance with some embodiments of the present disclosure;
fig. 7C illustrates an implicit indication of the number of data layers using DMRS (demodulation reference signals) according to some embodiments of the present disclosure.
Detailed Description
Various exemplary embodiments of the invention are described below with reference to the drawings to enable one of ordinary skill in the art to make and use the invention. It will be apparent to those of ordinary skill in the art upon reading this disclosure that various changes or modifications can be made to the examples described herein without departing from the scope of the invention. Accordingly, the present invention is not limited to the exemplary embodiments and applications described or illustrated herein. Further, the particular order or hierarchy of steps in the methods disclosed herein is merely exemplary. Based upon design preferences, the specific order or hierarchy of steps in the methods or processes disclosed may be rearranged while remaining within the scope of the present invention. Accordingly, one of ordinary skill in the art will understand that the methods and techniques disclosed herein present the various steps or actions in a sample order, and the invention is not limited to the specific order or hierarchy presented unless otherwise explicitly stated.
Embodiments of the present invention are described in detail with reference to the accompanying drawings. Although shown in different figures, the same or similar components may be indicated by the same or similar reference numerals. A detailed description of configurations or processes well known in the art may be omitted to avoid obscuring the subject matter of the present invention. Further, the definition of terms takes into consideration its functionality in the embodiment of the present invention, and may vary according to the intention, use, and the like of a user or an operator. Therefore, the definition should be made based on the entire contents of the present specification.
Fig. 1A illustrates an example
Referring to fig. 1A, a
Wireless transmissions from the transmit antenna of the UE104 to the receive antenna of the BS102 are referred to as uplink transmissions, while wireless transmissions from the transmit antenna of the BS102 to the receive antenna of the UE104 are referred to as downlink transmissions. The BS102 and the UE104 are contained within the geographic boundaries of the
When the UE104 is at an
As the UE104 approaches the BS102, the path loss decreases and the signal level at the BS102 increases, so the SNR improves. Accordingly, the BS102 instructs the UE104 to reduce power to minimize interference to other UEs and/or the
Fig. 1B illustrates a block diagram of an example
The
As one of ordinary skill in the art will appreciate, the
Wireless transmissions from the transmit antenna of the UE104 to the receive antenna of the BS102 are referred to as uplink transmissions, while wireless transmissions from the transmit antenna of the BS102 to the receive antenna of the UE104 are referred to as downlink transmissions. According to some embodiments, the
The
The
Next, the
Further, the steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a firmware, in a software module executed by the
Referring again to fig. 1A, as mentioned above, BS102 repeatedly broadcasts system information related to BS102 to one or more UEs (e.g., 104) to allow
Referring again to fig. 1B, in some embodiments, the primary system information carried by the first broadcast signal may be transmitted by BS102 in a symbol format over
In some embodiments, the UE104 may operate in a hybrid communication network, where the UE communicates with the BS102 and other UEs, e.g., between 104a and 104 b. As will be described in further detail below, the UE104 supports sidelink communications with other UEs and downlink/uplink communications between the BS102 and the
Fig. 2 illustrates an exemplary conventional 64QAMCQI table having 16 entries or index values according to some embodiments of the present disclosure. Since the table contains only 16 possible index values (0 to 15), only four bits are required to specify each index value. As shown in fig. 2, the 64QAM CQI table contains 6 entries for QPSK modulation, 3 entries for 16QAM modulation, and 6 entries for 64QAM modulation. Referring to fig. 2, as an example, it should be noted that
In the illustrated embodiment, the highest supported modulation order is 64 QAM. It should be noted that different CQI tables may be used to support higher modulations, such as 256QAM and 1024QAM, with each higher modulation order having at least one entry. Thus, when radio conditions get better or get worse, or when switching transmission modes (e.g. from downlink to uplink or vice versa), there is at least one CQI table with at least one entry with an optimal modulation order applicable to maximize bandwidth efficiency and data rate while maintaining a sufficiently low error rate. It should be noted that the exemplary 64QAM CQI table shown in fig. 2 is merely an example, and that different numbers of entries for
Fig. 3 illustrates an exemplary conventional 64QAMMCS having 32 entry or index values according to some embodiments of the present disclosure. Since the table contains only 32 possible index values, i.e., 0 to 31, only five bits are required to specify each index value. As shown in fig. 3, the 64QAM MCS table contains 11 entries for QPSK modulation, 8 entries for 16QAM modulation, and 13 entries for 64QAM modulation. It should be noted that the exemplary 64QAM MCS table shown in fig. 3 is merely an example, and that different numbers of entries for various modulation orders 302 and different TBS indices 303 may be constructed according to various embodiments of the present invention. In some embodiments, the MCS table of fig. 3 may be modified to support modulation orders higher than 64QAM without increasing the number of bits under the DCI/UCI format that need to be uniquely specified or the number of entries/index values in the MCS table. In some embodiments, the MCS table may be generated based on computer simulation results, as will be understood by those skilled in the art. It should be noted that the present invention is not limited to the specific examples of MCS/CQI tables described herein, and that any MCS/CQI table with different supported modulation orders may be configured or used, in accordance with various embodiments of the present invention. For example, in the scenarios discussed above, the MCS table may be configured to support higher order modulation (e.g., 1024QAM) to improve overall network capacity and bandwidth efficiency, according to some embodiments. Such scenarios include, for example, when there is a high SNR in the current channel, the UE104 (e.g., 104e in fig. 1A) is close to the BS102, the direct line of sight between the UE104 and the BS102 is strong; when the UE104 is stationary or moving at a small rate, especially in a very small cell BS area (e.g., a home base station), and under excellent environmental conditions.
Fig. 4A-4C illustrate 3 exemplary modified 64QAM MCS tables with 32 entries or index values according to some embodiments of the present disclosure. Similar to the 64QAM MCS table currently used in LTE communications shown in fig. 3, the modified 64QAM MCS table contains 11 entries for QPSK modulation, 8 entries for 16QAM modulation, and 13 entries for 64QAM modulation. It should be noted that the exemplary modified 64QAM MCS table shown in FIG. 4A is for example only, and may be constructed for various modulation orders 302 and not according to various embodiments of the present inventionA different number of entries with the TBS index 303. In some embodiments, the MCS tables of fig. 4A-4C may be modified to support modulation orders higher than 64QAM without increasing the number of bits under the DCI/UCI format that need to be uniquely specified or the number of entries/index values in the MCS tables. In some embodiments, the MCS table may be generated based on computer simulation results, as will be understood by those skilled in the art. In some embodiments, the modified 64QAM MCS table contains 2 new columns: new modulation order Qn402 and a predefined number of data layers NLayer(s)404. According to some embodiments, Q may be basedm302 and Qn402 to configure NLayer(s)404. In some embodiments, NLayer(s)=Qm/QnAnd N isLayer(s),QmAnd QnIs a positive integer. In some embodiments, QnIs a constant for all 32 entries in the modified table. FIGS. 4A and 4B illustrate the relationship between Q and Q, respectivelyn2 modified 64QAM MCS tables at 2 and 1. Different QnThe values result in different respective numbers of data layers NLayer(s). For example, as shown in FIG. 4A, when QnWhen 2, N is for QPSK modulation, 16QAM modulation, and 64QAM modulation, respectivelyLayer(s)2, 4 and 6. When Q is shown in FIG. 4BnWhen 1, N is used for QPSK modulation, 16QAM modulation, and 64QAM modulation, respectivelyLayer(s)1,2 and 3. As will be discussed further below, BS102 further selects an entry of MCS index 301 in the modified MCS table for UE104 based at least on the CQI report received from
FIG. 4C illustrates Q-while-Q according to some embodiments of the present disclosurenExemplary modified 64QAM MCS table when not constant. In the illustrated embodiment, the 11 entries for QPSK have the same new modulation order Q of
Fig. 5A illustrates a
The
In some embodiments, the DLRS is interleaved in time and frequency, which allows the UE104 to perform complex interpolation of the channel time-frequency response to estimate the channel effect on the transmitted information. In some embodiments, the DLRS may also be a specific cell reference signal (CSRS) or a specific UE reference signal (UESRS).
The
The method continues with
The
The
In some embodiments, when BS102 contains multiple modified MCS tables, BS102 first determines a particular MCS table for UE104 based on the received CQI information including channel quality and spectral code rate. According to some embodiments, BS102 may further select an MCS index for UE104 from a particular MCS table. In some embodiments, different UEs within the same cell may obtain different MCS indices from different MCS tables. In some embodiments, the modified MCS table is derived from a conventional MCS table and the original modulation order, i.e. Q, is omittedm。
The
The
Fig. 6 shows an exemplary data processing diagram 600 illustrating a splitting process performed by the UE104 after receiving scheduling information from the BS102, in accordance with some embodiments of the present disclosure. The plurality of processes may include, but are not limited to, data splitting, channel coding, scrambling/interleaving, modulation, sequence spreading, resource mapping, and data segment stacking. In the illustrated embodiment, the source information bits are first divided into N data segments on N data layers, i.e., 1, using a serial-to-
Referring again to fig. 5A, the
In some embodiments, the BS102 need not be configured to transmit a spreading sequence or a random phase vector to the
Fig. 5B illustrates a method 520 of performing multi-layer uplink transmission in an unlicensed scenario, according to some embodiments of the present disclosure. It should be understood that additional operations may be provided before, during, and after the method 520 of fig. 5B, and that some other operations may be omitted or only briefly described herein.
The method 520 begins at operation 522, where the UE104 processes data for uplink transmission, according to some embodiments. In some embodiments, the UE104 processes data according to a data processing configuration, including a data spreading sequence, a random phase vector, and the like, which may be selected from a pool of data processing configurations according to the number of data layers selected by the
In some embodiments,
In some embodiments, the number of data layers, N, in a data processing configuration may be explicitly indicated (hereinafter "explicit indication"), implicitly indicated (hereinafter "implicit indication"), or a combination thereof, from the UE104 to the BS102Layer(s). In some embodiments, explicit indication refers to indicating some information (e.g., resources) by information bits in a control signal, such as an RRC message. In some embodiments, the explicit indication may be provided by, for example, a format of a bitmap in Uplink Control Information (UCI), wherein a modulation and coding configuration I in the UCI is configuredMCSAnd number of data layers NLayer(s). For example, when N isLayer(s)When 4, 2 bits of data in the UCI may be used to inform the
In some embodiments, implicit indication refers to indicating some information (e.g., resources) by information in the preamble or reference signal. In the case of implicit indication using a preamble signal, various methods may be used. For example, a Zadoff-Chu (ZC) root sequence may be used to indicate NLayer(s). In some other embodiments, Cyclic Shift (CS), Orthogonal Cover Code (OCC), comb structure, time-frequency resource, and RNTI (radio network temporary identity) may also be used to implicitly indicate NLayer(s). When processing uplink transmission data received from the UE104, the BS102 determines NLayer(s)。
Fig. 7A illustrates an implicit indication of a number of data layers using a Zadoff-chu (zc) root sequence, according to some embodiments of the present disclosure. For example, assume NLayer(s)Is 4 and the number of ZC root sequences is 64. According to some embodiments, the ZC root sequences may be divided into 4 groups according to their ZC root sequence indices. At the placeIn the illustrated embodiment, the first 16ZC root sequence index 702[1,2,3, …,16]Indication of
Fig. 7B illustrates an implicit indication of the number of data layers using time-frequency resources, in accordance with some embodiments of the present disclosure. In the illustrated embodiment, there are 4 Resource Blocks (RBs) 712, namely RB1, RB2, RB3, and RB4, and 4N for uplink data transmissionLayer(s). Each RB for uplink data transmission may be used to indicate a different NLayer(s). In the illustrated embodiment, the first RB 712 (i.e., RB1) indicates
Fig. 7B further illustrates a configuration of resource blocks for uplink data transmission, in accordance with some embodiments. For example,
In some embodiments, an implicit indication of the number of data layers may be carried in the orthogonal cover code. In some embodiments, OCC may be added to carry DMRS (demodulation parameters)Reference signal). OCC groups may correspond to different numbers of data layers. For example, according to a particular embodiment, OCC group [ 11 ]]Indication of NLayer(s)Is 1; OCC group [1-1]Corresponding to NLayer(s)Is 2; OCC group [ -11]Corresponding to NLayer(s)Is 3; and, OCC group [ -1 [ ]]Corresponding to NLayer(s)Is 4.
In some embodiments, an implicit indication of the number of data layers may be carried in the RNTI (radio network temporary identity) of the
In the case of using a reference signal for implicit indication, various methods may be used. In some embodiments, N may be implicitly indicated by DMRS (demodulation reference signal)Layer(s). For example, according to a specific rule known in the art, in NR, DMRSs mapped to physical resources are determined by parameters such as symbols in the time domain, OCC, comb, and the like.
Fig. 7C illustrates an implicit indication of the number of data layers using DMRS (demodulation reference signals) according to some embodiments of the present disclosure. For example, there are 12 antenna ports 732 divided into 4 groups. In the illustrated embodiment,
The method 520 continues with operation 524, where the UE104 transmits an uplink signal to the BS102 along with the selected modulation, coding, and data processing configuration, according to some embodiments. The UE104 communicates the selected modulation, coding, and data processing configuration to the BS102 to enable the BS102 to successfully decode the uplink transmission data set received from the
While various embodiments of the present invention have been described above, it should be understood that they have been presented by way of example only, and not limitation. Similarly, the various figures may depict example architectures or configurations provided to enable one of ordinary skill in the art to understand the example features and functionality of the present invention. However, such persons will understand that the invention is not limited to the example architectures or configurations shown, but can be implemented using a variety of alternative architectures and configurations. In addition, as one of ordinary skill in the art will appreciate, one or more features of one embodiment may be combined with one or more features of another embodiment described herein. Thus, the breadth and scope of the present disclosure should not be limited by any of the above-described exemplary embodiments.
It will also be understood that any reference herein to elements using a name such as "first," "second," etc., does not generally limit the number or order of those elements. Rather, these names may be used herein as a convenient means of distinguishing between two or more elements or instances of an element. Thus, reference to first and second elements does not imply that only two elements are used or that the first element must be somehow before the second element.
In addition, those of ordinary skill in the art would understand that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, and symbols that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
One of ordinary skill in the art will further appreciate that any of the illustrative logical blocks, modules, processors, means, circuits, methods, and functions described in connection with the aspects disclosed herein may be implemented as electronic hardware (e.g., a digital implementation, an analog implementation, or a combination of the two, which may be designed using source coding or some other technique), various forms of design code or programs containing instructions (which may be referred to herein, for convenience, as "software" or a "software module"), or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software, or as a combination of such technologies, depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
Furthermore, those of ordinary skill in the art will appreciate that the various illustrative logical blocks, modules, devices, components, and circuits described herein may be implemented within or performed by an Integrated Circuit (IC) that may include: a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, or any combination thereof. The logic blocks, modules, and circuits may further include antennas and/or transceivers to communicate with various components within the network or within the device. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other suitable configuration, to perform the functions described herein.
If the functionality is implemented in software, the functionality may be stored as one or more instructions or code on a computer-readable medium. Thus, the steps of a method or algorithm disclosed herein may be implemented as software stored on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that can cause a computer program or code to be transferred from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer.
In this document, the term "module" as used herein refers to software, firmware, hardware, and any combination of these elements for performing the associated functions described herein. In addition, for purposes of discussion, the various modules are described as discrete modules; however, it will be apparent to one of ordinary skill in the art that two or more modules may be combined to form a single module that performs the associated functions in accordance with embodiments of the present invention.
Additionally, memory or other storage devices and communication components may be employed in embodiments of the present invention. It will be appreciated that the above description for clarity has described embodiments of the invention with reference to different functional units and processors. However, it will be apparent that any suitable distribution of functionality between different functional units, processing logic elements or domains may be used without detracting from the invention. For example, functionality illustrated to be performed by separate processing logic elements or controllers may be performed by the same processing logic elements or controllers. Thus, references to specific functional units are only to references to suitable means for providing the described functionality rather than indicative of a strict logical or physical structure or organization.
Various modifications to the embodiments described in this disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the novel features and principles disclosed herein, as set forth in the following claims.
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