CN110036571B

CN110036571B - Codebook-based uplink transmission method

Info

Publication number: CN110036571B
Application number: CN201880004834.6A
Authority: CN
Inventors: 杨维东; 周子涵; 苏昭诚; 蔡隆盛
Original assignee: MediaTek Inc
Current assignee: MediaTek Inc
Priority date: 2017-09-19
Filing date: 2018-09-19
Publication date: 2021-08-20
Anticipated expiration: 2038-09-19
Also published as: WO2019057094A1; TW201921864A; TWI687071B; CN110036571A

Abstract

Various approaches are described relating to codebook-based uplink transmission in wireless communications. A User Equipment (UE) generates a codebook including a plurality of precoders. The UE processes information using the codebook and sends the processed information to a network node of the wireless network. In generating the codebook, the UE selects a candidate precoder from a single-order codebook or a dual-order codebook and performs permutation on the candidate precoder. The codebook-based uplink transmission method can reduce transmission overhead, improve system performance and reduce power consumption of UE.

Description

Codebook-based uplink transmission method

Cross-referencing

The invention respectively requires the application numbers of 9 and 19 in 2017, 62/560,231 in 2017, 29 in 2017 and 9 and 29 in 2017, 62/565,182 in 2017, 11 in 2017 and 10 and 11 in 2017, 62/570,685 in 2017 and 17 in 2017 and the priority of the U.S. patent application with 62/588,200. The contents of the above-mentioned U.S. patent application are incorporated herein by reference in their entirety.

Technical Field

The present invention relates generally to wireless communication technology. More particularly, the present invention relates to codebook-based Uplink (UL) transmission in wireless communications.

Background

Unless otherwise indicated herein, the approaches described in this section are not prior art to the claims set forth below and are not admitted to be prior art by inclusion in this section.

There are significant differences in network node implementation and deployment scenarios compared to the Downlink (DL) codebook design. Due to different gain set points, a problem of Relative Phase Discontinuity (RPD) has been identified in Long-Term Evolution (LTE) mobile communication systems. Due to the limited form factor and the susceptibility of a given instantaneous radiation/propagation environment to influences such as handsets, complex local scattering, etc., there can also be possible antenna gain differences at the User Equipment (UE) side. There may also be frequency coherence issues such as non-common mode phase noise when multiple plates are used at the UE. More complicated is the case in the fifth generation (5)^th-Generation, 5G) or New Radio (NR) mobile communication systems, supporting both discrete Fourier transform OFDM (DFT-OFDM) and cyclic-prefix orthogonal frequency division multiplexing (CP-OFDM) waveforms, and they have different requirements for precoder in peak-to-average power ratio (PAPR) maintenance.

Disclosure of Invention

The following summary is illustrative only and is not intended to be in any way limiting. That is, the following summary is provided to introduce concepts, features, benefits and advantages of the novel and non-obvious techniques described herein. Selected embodiments are further described below in the detailed description. Thus, the following summary is not intended to identify essential features of the claimed subject matter, nor is it intended for use in determining the scope of the claimed subject matter.

Various solutions, schemes, methods and arrangements are proposed in relation to codebook based uplink transmission in wireless communication. According to various aspects presented herein, codebooks may be designed to be robust to different scenarios. The codebook may encompass multiple target codebooks optimized for a particular antenna configuration and/or scenario (e.g., a rank-2 Mutual Unbiased Base (MUB) extension of a release 8(Rel-8) DL four transmitter (4Tx) rank (rank)2 codebook, a release 10(Rel-10) UL 4Tx rank 1 codebook, and a release 15(Rel-15) DL NR 4Tx rank 2 codebook). It is believed that the proposed solution, scheme, method and apparatus may reduce transmission overhead, improve system performance and reduce power consumption of the UE.

In an aspect of the disclosure, a method involves a processor of a UE constructing a codebook including a plurality of precoders. The method also involves the processor processing information using the codebook. The method further involves the processor sending the processed information to a network node of a wireless network. In constructing the codebook, the method involves the processor selecting a candidate precoder from a single-order codebook or a dual-order codebook, and performing a permutation on the candidate precoder.

In one aspect of the invention, an apparatus includes a transceiver and a processor coupled to the transceiver. The transceiver is capable of wireless communication with a network node of a wireless network. The processor is capable of: (a) constructing a codebook including a plurality of precoders; (b) processing information using the codebook; and (c) transmitting the processed information to a network node of a wireless network via the transceiver. In constructing the codebook, the processor can select a candidate precoder from a single-order codebook or a dual-order codebook and perform a permutation on the candidate precoder.

It is noteworthy that although the description provided herein is in the context of certain wireless access technologies, networks, and network topologies, such as LTE, LTE-Advanced (LTE-Advanced) and LTE-Advanced (LTE-Advanced Pro), 5G, NR, Internet of Things (IoT), and narrowband Internet of Things (NB-IoT), the concepts, schemes, and any variations/derivatives thereof presented herein may be implemented in, for, and through other types of wireless access technologies, networks, and network topologies. Accordingly, the scope of the invention is not limited to the examples described herein.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is to be understood that the figures are not necessarily to scale, some components may be shown out of scale from the actual implementation, in order to clearly illustrate the concepts of the present invention.

Fig. 1 is an exemplary message chain diagram of a process for UL codebook-based transmission involving a UE and a network node according to the present invention.

Fig. 2 is an exemplary conceptual diagram according to the present invention.

Fig. 3 is an exemplary conceptual diagram according to the present invention.

Fig. 4 is an exemplary conceptual diagram according to the present invention.

Fig. 5 is a proposed rank 1 codebook design according to the present invention.

FIG. 6 is an exemplary scenario diagram according to the present invention.

Fig. 7 is a proposed rank 2 codebook design according to the present invention.

FIG. 8 is an exemplary scenario diagram according to the present invention.

FIG. 9 is an exemplary scenario diagram according to the present invention.

FIG. 10 is an exemplary scenario diagram according to the present invention.

Fig. 11 is a diagram of an exemplary wireless communication environment, in accordance with an embodiment of the present invention.

FIG. 12 is a flow diagram of an example process according to an embodiment of the invention.

Detailed Description

Examples and embodiments of the claimed subject matter are described in detail below. However, it is to be understood that the disclosed embodiments and implementations are merely illustrative of the claimed subject matter that may be embodied in various forms. The present invention may be embodied in many different forms and should not be construed as being limited to the exemplary embodiments and implementations set forth herein. Rather, these exemplary embodiments and implementations are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the following description, well-known features and technical details are omitted to avoid unnecessarily obscuring the presented embodiments and implementations.

SUMMARY

Embodiments of the present invention relate to various techniques, methods, schemes and/or solutions related to codebook-based uplink transmission in wireless communications. Many possible solutions may be implemented according to the invention, either individually or in combination. That is, although the possible solutions are described separately below, two or more of the possible solutions may be implemented in one combination or another.

NR uplink codebook design

Since the codebook for NR needs to support various radio environments and various UE practical problems, the present invention proposes various methods and/or schemes for designing a rank 2 or higher rank codebook such that the codebook includes an LTE Rel-10UL four transmitter (4Tx) codebook and an NR Rel-15 DL 4Tx codebook as described below.

In the present invention, the phrase "chordal equivalence" may be used to refer to two codewords having a chordal distance of 0. Further, when there are chordal equivalent codewords of any codeword of the second codebook (codebook 2) in the first codebook (codebook 1), it can be said that codebook 1 "covers" codebook 2. In addition, for either of the two codebooks, "chordal equivalence" may be used to refer to both codebooks when there is a chordal equivalence codeword in the other codebook. In other words, they are overlaid on each other.

In addition to the designs and structures described above, additional designs and structures are described below in accordance with the present invention. It can be verified that the design codebook proposed by the present invention can fully cover the Rel-8 DL 4Tx rank 2 codebook, the rank 2MUB extension of the Rel-10UL 4Tx rank 1 codebook, and the Rel-15 DL NR 4Tx rank 2 codebook.

According to the proposed solution, the following four vectors can be defined:

according to the proposed solution, for the first method (or "first structure"), a number of the following can be defined

k is 1,2, …,16 matrix:

1. eight matrices

k 1, …, 8 from

Where c is 0,2, [ phi ]₁＝1，j。

2. Eight matrices C₂ ^(k)K 9, …,16 from

Wherein phi₂＝1，j，-1，-j。

Here, the rank 2 precoder may be given by:

according to the proposed solution, for the second method (or "second structure"), a number of the following can be defined

k＝1，2, …,16 matrix:

1. eight matrices

k 1, …, 8 from

Where c is 0,2, [ phi ]₁＝1，j。

2. Eight matrices

k 9, …,16 from

Wherein phi₂＝1，j，-1，-j。

Here, the rank 2 precoder may be given by:

generally, in the second configuration, a diagonal matrix R (R ═ diag ([1 e) for each θ^jθ 1 e^jθ]) May be multiplied by 8 matrices in 2 and 8 matrices in 1 from the left side to obtain another chordal equivalent codebook in the first configuration.

According to the proposed solution, for the third method (or "third structure"), a plurality of the following can be defined

k is 1,2, …,4 matrix:

1. four matrices

From

Wherein phi₁＝1，j。

Here, the rank 2 precoder may be given by:

or

Is from

Any one of the eight matrices of (1), where phi₂＝1，j，-1，-j。

Or, can be at

In the structure using

Because of the code words they produce and

the chord distance of the generated code words is equivalent. It is noted that in all configurations, some codewords may be fetched (e.g., not all codewords in an existing codebook need to be covered). Further, additional codewords may be included. In NR DL 4Tx codebook designs, even if they generate chordal equivalent codebooks,

can be combined with

Are included together. A similar approach can be taken here, C₂ ^(k)More matrices may be included.

According to the proposed scheme, for the fourth method (or "fourth structure"), the codebook structure can be implemented as an antenna port re-index. Thus, a permutation matrix may be introduced in the codebook structure.From a first codebook, such as a dual-order codebook in TS 38.214 (v.0.1.22017 September)

Where k is a general index (e.g., k ═ i_1，1，i_1，2，i_1，3) M is a general index (e.g., m ═ i)₂) Expanded codebooks may be constructed from

Given, where 1. ltoreq. k₁K is less than or equal to K and

a permutation matrix is represented. One example is provided below.

With the NR DL 4Tx codebook where L is 1, the following permutation matrix may be applied to the rank 2 precoder

In this case, the beam group may be determined by k and the permutation matrix index. For the UE, the permutation matrix index may be determined long term (e.g., by Radio Resource Control (RRC) signaling and/or Medium Access Control (MAC) Control Element (CE) as part of Codebook Subset Restriction (CSR) or independent of CSR), and thus the feedback overhead of the expanded codebook may remain unchanged compared to the initial codebook (e.g., NR DL 4Tx codebook). With the above example, the proposed design may cover the Rel-8 rank 24 Tx codebook and the Rel-15 NR rank 24 Tx codebook.

It is noted that for other ranks, the same or different permutation matrices may be identified to expand the codebook. In summary, applying the permutation matrix to the existing or first codebook to obtain the enlarged or second codebook may be considered as a general approach to dealing with irregular antenna configurations. For the first, second, and third structures described above, a plurality of permutation matrices may be used using the rotation of the first, second, and third structures

And

to enlarge such as

A codebook of (a).

Unified codebook design supporting multiple scenarios

In 5G/NR mobile communication, a variety of scenarios may be encountered in the application of UL codebook, including RPD, non-common mode phase noise, Antenna Gain Imbalance (AGI), and so on. In addition to Uniform Linear Array (ULA) and non-ULA antenna configurations, NR UL codebooks are also expected to support these scenarios. Specifically, the codebook has all codewords in the LTE Rel-10UL 4Tx codebook and the NR Rel-15 DL 4Tx codebook.

In accordance with the proposed scheme of the present invention, to support both ULA and non-ULA antenna configurations, a dual-order codebook structure with a first structure ("structure 1") or a second structure ("structure 2") may be employed, as described below.

For Structure 1, let N₁＝2，N₂＝1，O ₁4, L2, the following can be defined:

in this design:

order to

And

rank 1 precoder may be constructed from

Given, where k is 0. ltoreq. N₁O₁3, < 1 > i, < j > 2, and 0 < n > 3. It is to be noted that (i, j) ═ 1, 1 (1, 2), (2, 1), (2, 2), Φ_nCan take the value from 1, j, -1, -j, e_iIs an L x1 vector that is 1 at element i and zero elsewhere. It is further noted that when L is 1, there are 16 rank 1 precoders of the Rel-104 Tx UL codebook (the first 16 precoders in the Rel-104 Tx UL codebook are used for port combining) and 32 rank 1 precoders of the Rel-15 NR DL 4Tx codebook. By combining these vectors together, 40 unique precoders (8 precoders in total in both codebooks) can be obtained.

It is also noted that the allowable range of each parameter is limited by the CSR. To support the same 4Tx port combined with rank 1 precoders in the Rel-10UL 4Tx codebook, CSR may be considered. For example, a beam group restriction k of 0,2 (e.g., k ≠ 1, 3) may be employed, which enables the beam to be restricted to W₁Is saved by oneParticularly, the method is used for preparing the high-performance liquid crystal display. Furthermore, the allowed common phase values depend on the beam selection pair k 0 and k 2. When k is 0, for beam selection (i, j) ═ 1, 1 or (2, 2), it may be allowed to take a common phase value from { j, -j }; for beam selection (i, j) ═ 1,2 or (2, 1), common phase values from {1, -1} may be allowed. When k is 2, for beam selection (i, j) is (1, 2) or (2, 1), it may be allowed to take a common phase value from { j, -j }; for beam selection (i, j) ═ 1, 1 or (2, 2), common phase values from {1, -1} may be allowed. Thus, in W₂One bit is saved on the signaling of (1).

To support the same rank 1 precoder of the Rel-15 DL 4Tx codebook, the following CSRs may be employed: the beam selection (i, j) is limited to (1, 1) or (2, 2). (e.g., (1, 2) and (2, 1) are not allowed).

For structure 2, let N₁＝2，N₂＝1，O ₁4, L4, the following can be defined:

in this design:

order to

And

wherein e is_iIs an L x1 vector that is 1 at element i and zero elsewhere.

The rank 1 precoder may be given by:

here, (i, j) ═ 1, (2, 2), (3, 3), (4, 4), (1, 3), (3, 1), (2, 4), (4, 2), Φ_nValues can be taken from 1, j, -1, -j. Therefore, there are eight options for beam selection, and quadrature phase-shift keying (QPSK) can be used for the common phase.

Similar to the structure 1 case, CSR may also be used to reduce signaling overhead and recover the NR DL 4Tx codebook and the Rel-10UL 4Tx codebook. To recover the Rel-10UL 4Tx codebook, the first beam group (and no other beam groups) is needed (e.g., k is 0). For beam selection (1, 1), (2, 4), (3, 3) and (4, 2), the common phase values are limited to { j, -j }. For beam selection (1, 3), (2, 2), (3, 1) and (4, 4), the common phase values are limited to {1, -1 }. To recover the NR DL 4Tx codebook, the beam selection (i, j) is limited to (1, 1), (2, 2), (3, 3) and (4, 4).

Conditional codebook usage

By using the conditional codebook, the precoders actually used by the UE can be modified on the codewords given in the specification (e.g., in TS 38.214) according to signaling from the base station (e.g., via dynamic or semi-static signaling). According to the scheme provided by the invention, when a base station (for example, a gNB) detects that one or more antenna port gains from a UE are low, the base station can transmit signals to the UE semi-statically through RRC signaling or MAC CE, so that the UE does not select certain antennas. For example, the base station may signal to the UE using a bitmap in which each "0" indicates that the UE's corresponding antenna port is off (e.g., bitmap [ 1010 ]]Instruct the UE to turn off the second and fourth antennas of the four antennas of the UE). Thus, all codebook designs in structure 1 above can be reused. On the UE side, once the UE receives a Precoding Matrix Indicator (PMI) from the base station, some elements of the indicated precoder may be turned off according to the indication from the base station. Advantageously, dynamic signaling design and codebook design can be simplified. Notably, W₁And possibly also in semi-static signalling/MAC CEs.

According to the proposed solution, the base station may take measures such as SRS-based RPD calibration from the coherent group composition indicated by the UE to see if the necessary remedial steps are sufficient to eliminate the coherent group constraints related to the coherent transmission capability of the antenna at the UE. Since the base station performs SRS calibration based on the SRS, this may be extended to demodulation reference signals (DMRSs) from the UE. For example, the base station may transmit the same Transmitted PMI (TPMI) to the UE and use different Physical Uplink Shared Channel (PUSCH) transmit power levels to calibrate the RPD behavior of the UE. In view of the SRS/DMRS based on the calibration result, the base station may instruct the UE to use a precoder with phase rotation, which is related to a precoder extracted from the SRS/DMRS transmission of the UE. If the remedial steps of the base station are still insufficient, or the base station is physically unable to remedy the situation (e.g., non-common mode phase noise at the UE), the base station may send a codebook restriction signal to the UE. In this case, the meaning of the codebook (constructed by structure 1 or structure 2) may be modified.

When there are two coherent groups, for

In structure 1, if j is 1, then: (1) the precoder may be used for coherent group 1, (2)

only elements

1 and 2 of the precoder may be used for coherent group 1, and (3) for ports in coherent group 2, the transmit power may be turned off. Otherwise, if j is 2, then: (1) the precoder may be used for coherent group 2, (2) only elements 3 and 4 may be used for coherent group 2, and (3) for ports in coherent group 1, the transmit power may be turned off. A similar procedure is also possible in the case where the antenna ports of the coherent group are from non-adjacent indices (e.g., ports 1 and 3 in coherent group,

ports

2 and 4 in coherent group 2).

According to the proposed scheme, re-indexing can be considered to allow arbitrary antenna coherence group definition. For example, the precoder may be given by the following index:

I(k，i，j，n)＝k·2×2×4+(i-1)×2×4+(j-1)×4+n，1≤i，j≤2，0≤n≤30≤k≤3。

then the indices are 0, 8, 16, 24, 32,40. Precoders of 48 and 56 may be used for port combining (1, 2) and precoders with indices of 1, 9, 17, 25, 33, 41, 49, and 57 may be used for port combining (1, 3), etc., the first two elements may be used for the relevant antennas. For example, when the index is 9, precoder [1, -1, j]^TIs specific because it is associated with port (1, 3), then 1 applies to port 1, -1 applies to port 3, closing

ports

2 and 4.

Notably, the constraints in the NR specification do not have to be enforced if the base station can configure the bitmap for the dynamically signaled addressable precoders. For example, even if there are more than 64 precoders in beam group k, the base station may configure the bitmap such that the total addressable precoders are limited to no more than 64, W₂There may be 6 bits.

Rank 2 precoder construction

According to the proposed scheme of the present invention, the rank 2 codebook structure may start from NR as follows:

in this case, the amount of the solvent to be used,

r is 0, 1, l is 0, 1. Furthermore, c_r，lRepresents a co-phase coefficient, wherein c_0，1＝1、c_1，0＝-c_1，1And c_1，0∈{1，j}，(k′_1，1，k′_2，1)∈{(0，0)，(O₁/2，0)，(O₁，0)，(O₁·3/2，0)}。

Similar to the antenna turn-off and phase coherent group approach described above, for the DFT-OFDM waveform, the rank 2 codeword thus obtained can be modified as necessary to derive the PAPR holding codeword. For example, the base station may provide the UE with TPMI mapped to a rank 2 codeword, as shown below (unit magnitude and phase angle for each element):

for DFT-OFDM waveforms, the UE can understand the following:

here, X denotes no transmission at the designated layer of a given antenna port. In the given example, the UE does not use ports 3 and 4 at the first layer (layer 1) and the UE does not use

ports

1 and 2 at the second layer (layer 2). The base station may provide a modification mask for all codewords (using [ 1X; X1; X1 in this example), or may use different modification masks for the codewords. It can be verified that most PAPR preserving rank 2 codewords of Rel-104 Tx UL can be generated by applying a mask to NR Rel 4Tx DL codewords of rank 2. Thus, codewords for different purposes may be embedded into a single codebook and the meaning employed at the UE may be modified according to signaling from the base station (e.g., via RRC signaling and/or MAC CE). The applied precoder may be the result of dynamic signaling and semi-static signaling, including possible CSRs. The procedure as shown in fig. 1 is used in terms of coherent group configuration and use of the corresponding codebook. Fig. 1 depicts an example message chain for a process 100 for UL codebook-based transmission involving a UE 110 and a network node 120 in accordance with the present invention.

Codebook-based transmission

According to the proposed solution of the present invention, the procedure as shown in fig. 1 can be used in terms of coherent group configuration and use of the corresponding codebook. Fig. 1 depicts an example message chain for a process 100 for UL codebook-based transmission involving a UE 110 and a network node 120 in accordance with the present invention.

Referring to fig. 1, in step (1) of process 100, UE 110 sends a report on Tx-chain coherent group report, analog beam packet, and synchronous transmission packet to network node 120. At step (2) of process 100, network node 120 sends signaling to UE 110 to configure SRS resources and SRS Resource Indicators (SRIs), Transmission Rank Indicators (TRIs), and/or TPMI mapping tables (including possible codebook subset restrictions) at UE 110. In particular, at step (2A), the network node 120 may configure SRS transmission parameters for RPD sounding and calibration. Further, at step (2B), UE 110 may perform SRS transmission to network node 120 for RPD calibration. In addition, at step (2C), network node 120 may send signaling to UE 110 to reconfigure the SRI/TRI and/or TPMI mapping tables (including possible codebook subset restrictions). In step (3) of the process 100, the UE 110 may perform transmission of SRS resources for UL Channel State Information (CSI) acquisition. In step (4) of process 100, network node 120 may send signaling to UE 110 for PUSCH scheduling using SRI/TRI/TPMI signaling in UL Downlink Control Information (DCI). In step (5) of process 100, UE 110 may refer to the codebook according to SRI/TRI/TPMI signaling from network node 120, and UE 110 may apply the precoder for the codebook according to the notified PMI.

According to the proposed solution of the invention, there are several options regarding the coherent group configuration and the use of codebooks. In the first option (option 1), the concept of coherent group may be used for the definition of the codebook, but the SRI/TRI/TPMI signaling design may support the dynamic indicated selection of codewords from any codebook. Fig. 2 depicts an exemplary concept 200 of option 1 according to the present invention. In concept 200, the port selection codebook and the port selection combination codebook may recursively construct a codebook.

In a second option (option 2), the network node (e.g., the gNB) may signal the coherent group configuration to the UE through RRC signaling or MAC CE. Further, dynamic signaling with UL DCI may be used to select one or more codewords from a codebook specifically defined for the coherent group configuration. Fig. 3 depicts an exemplary concept 300 of option 2 according to the present invention.

In a third option (option 3), the network node (e.g., the gNB) may signal the coherent group configuration to the UE through RRC signaling or MAC CE. Since the number of codewords in a codebook with four coherences (port selection codebook) is limited, and the port selection codebook can provide useful support for Antenna Gain Imbalance (AGI), the codebook with four coherent groups can support the case of two coherent group configurations and the case of one coherent group, respectively. Fig. 4 depicts an exemplary concept 400 of option 3 according to the present invention. In concept 400, the port selection codebook may be used in conjunction with a port combination codebook or a codebook constructed recursively from two coherent groups. Notably, for option 3 of a UE configured with one coherent group (e.g., from the network perspective, the UE is able to perform phase coherent transmission of all four Tx chains), the network node may dynamically signal the codeword from the port selection codebook or the port combination codebook.

Thus, precoder selection at the base station/network node (e.g., gNB) is not limited by coherent group signaling from the UE (e.g., option 1 and option 3). The concept of coherent groups may be used for the definition of codebooks, but the SRI/TRI/TPMI signaling design may support dynamic indicated selection of codewords from any codebook. This is important and beneficial for solving the problem of UL transmission power.

Port combination uplink codebook design

In view of the foregoing, it would be desirable to have a codebook that supports both ULA and non-ULA antenna configurations. Specifically, the desired 5G/NR UL codebook covers all codewords in the Rel-10UL 4Tx codebook and the NR version Rel-15 DL 4Tx codebook.

Fig. 5 depicts a proposed rank 1 codebook design 500 according to the present invention. Referring to fig. 5, the proposed rank 1 codebook design 500 may cover the Rel-84-Tx DL codebook, the Rel-10UL 4Tx codebook, and the Rel-154-Tx DL codebook.

According to the scheme provided by the invention, N can be used₁＝2、N₂＝1、O₁The proposed NR rank 1 precoder is defined by 4 and L2. Thus, the definition is as follows:

order to

And

and

the rank 1 precoder may be given by:

wherein k is more than or equal to 0 and less than or equal to N₁O₁3, < 1 > i, j < 2 and 0 < n < 3.

It is noted that the allowed beam selection (i, j) is (1, 1), (1, 2), (2, 1) or (2, 2) and phi_nValues can be taken from 1, j, -1, -j. Herein, e_iIs an L x1 vector that is 1 at element i and zero elsewhere. It is also noted that there are 32 rank 1 precoders for which the 4Tx port combines 16 rank 1 precoders from the Rel-104 Tx UL codebook (the first 16 precoders in the Rel-104 Tx UL codebook are used for port combining) and the Rel-15 NR DL 4Tx codebook when L is 1. By combining these vectors together, 40 unique precoders (8 precoders in total in both codebooks) can be obtained.

Notably, the allowable range of each parameter may be limited by CSR.

To support the same 4Tx port combined with rank 1 precoders in the Rel-10UL 4Tx codebook, CSR may be employed. For example, a beam group restriction k of 0,2 (e.g., k ≠ 1, 3) may be employed, which enables the beam to be restricted to W₁One bit is saved on the signaling of (1). Furthermore, the allowed common phase values depend on the beam selection pair. When k is 0, for beam selection (i, j) ═ 1, 1 or (2, 2), it may be allowed to take a common phase value from { j, -j }; for beam selection (i, j) ═ 1,2 or (2, 1), one may allow for taking from {1, -1}And (4) a common phase value. When k is 2, for beam selection (i, j) is (1, 2) or (2, 1), it may be allowed to take a common phase value from { j, -j }; for beam selection (i, j) ═ 1, 1 or (2, 2), common phase values from {1, -1} may be allowed. Thus, in W₂One bit is saved on the signaling of (1).

To support the same rank 1 precoder of the Rel-15 DL 4Tx codebook, CSR may be employed. Specifically, the beam selection (i, j) is limited to (1, 1) or (2, 2). For example, (1, 2) and (2, 1) are not allowed.

At the base station/network node, since the antenna form factor problem is smaller than at the UE, the ULA is usually assumed for polarized antennas/antenna elements, and the two-dimensional (2D) cross-polarized antenna pair array is usually assumed for frequency division multiple-input-and-multiple-output (FD-MIMO).

FIG. 6 depicts

example scenarios

600A and 600B in accordance with this disclosure. Referring to FIG. 6, scenario 600A depicts an example ULA response, wherein a signal emitted by a signal source collides with a uniform linear array. Typically in array signal processing, the signal model is used for reception. The signal model may be used for transmission as well. Phase difference X between receivers_iAnd i is more than or equal to 1 and less than or equal to N, and the projection d of the antenna position in the wave propagation direction_iAnd (4) determining. The array response vector may be represented by a phase distribution d₁、d₂… and d_NDetermining:

in the case of ULA, due to d_iIs a uniform difference (e.g., d)_i+1-d_iΔ, which is the antenna pitch), the phase difference is also uniform. The phase difference may be matched using DFT. Thus, high-gain coherent transmission and reception can be obtained.

However, on the UE side, an irregular antenna layout may occur as shown in scenario 600B. Generally speaking, adjacent projections d_iThe difference between them is not uniform and it is difficult to approximate P (d) directly with an arbitrary DFT beam₁，d₂，…，d_N). However, d can be rearranged₁、d₂… and d_NThe phase distribution is better approximated. For example, for a particular antenna layout, P (d) may be well approximated with a DFT beam_N，d₁，d₂，…，d_N1) In contrast, P (d) is not well approximated by any DFT beam₁，d₂，…，d_N). In other words, the front-facing of the antenna ports is useful.

Starting from the first codebook (e.g., a dual-order codebook):

where k is a general index (e.g., k ═ i_1，1，i_1，2，i_1，3) M is a general index (e.g., m ═ i)₂) E.g. i in TS 38.214 (v.0.1.22017 september)_1，1，i_1，2，i_1，3，i₂An expanded codebook may be constructed by

Wherein P is more than or equal to 1 and less than or equal to P and pi_pIs a permutation matrix.

It is noted that the number of codewords of the enlarged codebook is P times the first codebook. In the present invention, a process of generating the second codebook from the first codebook is referred to as "port permutation".

With the target irregular antenna layout known, it is possible to identify the required port permutation. Since there are many different antenna layouts at the UE, one criterion may be used to identify the shuffle parameters (rather than identifying port permutations for a particular antenna layout). According to the proposed scheme of the present invention, the larger codebook resulting from port permutation covers as many entries as possible in the Rel-8 DL codebook design and the Rel-15 NR DL codebook design as well as the MUB extension of the Rel-10UL codebook. Since the number of port permutations directly results in signaling overhead in UL DCI, it is also desirable to use as few port permutations as possible to cover the codewords of the reference codebooks (e.g., Rel-8, Rel-10, Rel-15 codebooks).

By port replacement, the design space consists of two parts: (1) selection of a first codebook, and (2) selection of a port permutation. Thus, two structures (e.g., "structure a" and "structure B") are provided as shown in the table below.

Fig. 7 depicts a proposed rank 2 codebook design 700 according to the present invention. Referring to FIG. 7, either structure A or structure B may cover the Rel-84Tx DL codebook, an extension of the Rel-104 Tx UL codebook, and the Rel-154 Tx DL codebook.

With regard to structure a, starting from NR Rel-154 Tx DL where L ═ 1, an expanded codebook of 128 codewords can be obtained using port permutation (1243), (1324), (1423) in addition to (1234) used for the initial codebook. The constructed codebook covers all codewords of the Rel-154 Tx DL codebook, the Rel-84Tx codebook and the Rel-10UL 4Tx codebook. With respect to structure B, the first codebook may be designed based on beam vector combinations and the expanded matrix may be based on the use of permutation matrices. A total of 64 codewords may be stored in the enlarged codebook. It can be verified that the designed codebook can fully cover the Rel-8 DL 4Tx rank 2 codebook, the rank 2MUB extension of the Rel-104 Tx UL rank 1 codebook, and the Rel-15 DL NR 4Tx rank 2 codebook.

For rank 2 in structure a, with the NR DL 4Tx codebook with L ═ 1, the following permutation matrix may be applied:

denoted as the permutation (1234),

indicated as a permutation (1243),

denoted as the permutation (1324),

denoted as permutation (1423).

Order to

In addition, it is possible to use

Generating 128 rank 2 codewords, p ═ 1,2, 3, 4, 0 ≦ k ≦ N₁O₁-1，n＝1，2。

For rank 2 in structure B. Let N₁＝2、N ₂1 and O ₁4. The 64 codewords may be generated using the following equation:

where P is 1, 2P_pCan be given by:

is the same as in the NR DL 4Tx codebook.

Order to

May be provided as follows

First selectable item (Alt 1) and second selectable item (Alt 2):

or

It is to be noted that it is preferable that,

do not necessarily simultaneously comprise

And

since they generate chordal equivalent codewords, one of which is sufficient. In addition to this, the present invention is,

do not necessarily simultaneously comprise

And

since they generate chordal equivalent codewords.

The bandwidth or subband precoder of the UL transmission may be indicated using the SRS resources and the aggregation of PMIs. For example, the aggregated

SRS resources

1,2, 3, and 4 may be used with a 4Tx codebook. A single implicit mapping from these SRS resources to codebook antenna ports may be assumed. In summary, it is assumed that a single order of SRS resources is not sufficient to provide good support for multiple antenna layout scenarios.

There are a number of ways to provide canonical support for codebooks through port permutation in accordance with the proposed scheme of the present invention, as described below.

According to the first method, when SRS resources each having a single port are used for the UL codebook, indicating to the UE the order in which the SRS resources are mapped to the codebook ports, it is sufficient to use the first codebook (and no other versions) for PMI definition. For example, the network node (e.g., the gNB) may indicate the PMI that

SRS resources

1,2, 3, and 4 use for signaling. In one case, the network node signals that

SRS resources

1,2, 3 and 4 are mapped to

ports

1,2, 3 and 4 (either by signaling of the SRI list or by the index of the list: (1, 2, 3, 4)). In another case, the network node signals that

SRS resources

1, 3, 2 and 4 are mapped to

ports

1,2, 3 and 4 (either by signaling of the SRI list or by the index of the list: (1, 3, 2, 4)). Two illustrative examples are shown in fig. 8 and 9. Fig. 8 depicts an example scenario 800 of port permutation (1234) indication from SRI signaling. Fig. 9 depicts an example scenario 900 of port permutation (1324) indication from SRI signaling.

According to the second method, when SRS resources each having a single port are used for the UL codebook, and the order in which the SRS resources are mapped to the codebook ports is fixed, an indication of SRS resource permutation is necessary for PMI definition. For example, the network node (e.g., the gNB) may indicate the PMI that

SRS resources

1,2, 3, and 4 use for signaling. In one design option, the network node signals a permutation of (UE) SRS resources (e.g., (1, 2, 3, 4) or (1, 3, 2, 4)), and the PMI may be used for the first codebook. In another design option, as shown in fig. 10, the permutation may be integrated in the PMI definition and the PMI may be used for the second codebook. Fig. 10 depicts an example scenario 1000 in which port permutation is an integrated part of codebook definition.

According to the third method, when a single SRS resource having multiple ports is used for the UL codebook, an indication of SRS port permutation is necessary for PMI definition. For example, a network node (e.g., a gNB) may indicate a PMI for signaling SRS resources with

ports

1,2, 3, and 4. In one design option, the network node signals a permutation of (UE) SRS ports (e.g., (1, 2, 3, 4) or (1, 3, 2, 4)), and the PMI may be used for the first codebook. In another design option, the permutation of SRS ports may be integrated in the PMI definition and the PMI may be used for the second codebook.

In summary, since the number of codewords for structure B is limited (up to 64) as described above, structure B may be a more reasonable choice of NR 4Tx rank 2 codebook between structure a and structure B.

Codebook to set restriction

According to the proposed scheme of the present invention, overhead reduction of TPMI and TPMI related signaling can be achieved for UL codebook-based transmission with one SRS resource and a given number of SRS ports. Various situations are described below:

in the first case ("case 1"), there is no coherence between the Tx chains, and two of the four ports may be selected for rank 2 transmission.

In the second case ("case 2"), rank 2 transmissions are from the same coherent group. In this case, a dual transmitter (2 Tx) codebook of rank 2 may be applied. Since there are two ways to select the coherent group, there are two ways to select the rank 22Tx precoder (assuming the same structure as the 2Tx UL codebook).

In the third case ("case 3"), AGI problems may arise even if it is fully coherent. Thus, port selection may cover all four ports, rather than being limited to only ports within the same coherent group as in case 2. It is noted that repetition counting can be avoided by discarding precoders already included in case 3 when calculating the number of coding states. That is, (6 (total number of combinations in case 3) -2 (total number of combinations in case 2)) x2 (the number of rank 22Tx codebook precoders) ═ 8.

In a fourth case ("case 4"), one spatial layer transmission may come from coherent group 1 and another spatial layer from coherent group 2. Thus, precoders exceeding 2Tx may be used on each coherent group. According to the design of the 2Tx codebook, there may be 6 rank 1 precoders, so there are 6x6 ways to pair the precoders over two coherent groups. Here, four precoders that have been covered in case 1 are excluded.

In the fifth case ("case 5"), for full coherence, in the following calculation, there are 16 entries if the Rel-84Tx codebook is used.

In general, there are 66 coding states for a 4Tx rank 2 transmission. When CSR is not applied, or even if applied but not reflected in DL signaling, then ceil (log2(66)) -7 bits are required for TPMI signaling. The following table summarizes the five cases. In this table, "CAG" represents a coherent antenna group, "4 CAG" represents incoherent, "1 CAG" represents fully coherent, "2 CAG" represents partially coherent, where

ports

1 and 2 form one coherent group and ports 3 and 4 form another coherent group.

Thus, CSR can provide savings from coherent groups. For example, for a coherent group without AGI problems (e.g., case 5), ceil (log2(16)) -4 bits are required. Advantageously, 3 bits can be saved compared to the case where the fixed TPMI size is 7 bits. For a coherent group and cases with AGI problems (e.g., case 5 plus case 3), ceil (log2(16+8)) -5 bits are needed. Advantageously, 2 bits can be saved compared to the case where the fixed TPMI size is 7 bits.

For case 5, in case of using the above-proposed dual-order codebook of the present invention without using the Rel-84Tx codebook, the base station can select a useful codeword accordingly. As mentioned above, the proposed dual order codebook includes all codewords for ULA and non-ULA antenna configurations. The base station may use a set (e.g., ULA codewords) to reduce signaling overhead. In this case, CSR can be a useful tool to reconcile design goals for which there are some conflicts, namely: (1) have as many codewords as possible to cover a variety of scenarios, and (2) have as few codewords as possible to minimize PMI related signaling overhead. Given the benefits provided by CSR, it is advantageous for the base station to have flexibility in deciding which codewords to use for UL MIMO. Thus, according to the proposed scheme, the base station may transmit the codebook subset restriction with the UL codebook bitmap to the UE through RRC signaling. The length of the bitmap is equal to the number of precoders in the codebook.

Illustrative embodiments

Fig. 11 depicts an example wireless communication environment 1100 according to an embodiment of the invention. Wireless communication environment 1100 relates to a communication device 1110 and a network device 1120 that are in wireless communication with each other. Any of the communications device 1110 and the network device 1120 may perform different functions that implement the processes, schemes, techniques, procedures, and methods described herein with respect to codebook-based uplink transmission in wireless communications, including the various processes, scenarios, schemes, solutions, and techniques described above and the process 1200 described below. Thus, communication apparatus 1110 is an example embodiment of UE 110 in process 100 and network apparatus 1120 is an example embodiment of network node 120 in process 100.

The communication device 1110 is part of an electronic device, which may be a UE such as a portable or mobile device, a wearable device, a wireless communication device, or a computing device. For example, the communication apparatus 1110 may be embodied as a smartphone, a smartwatch, a personal digital assistant, a digital camera, or a computing device such as a tablet computer, a desktop computer, or a notebook computer. Further, the communication device 1110 may also be part of a machine type device, which may be an IoT or NB-IoT device, such as a fixed device, a home device, a wired communication device, or a computing device. For example, the communication device 1110 may be implemented as a smart thermostat, a smart refrigerator, a smart door lock, a wireless speaker, or a home control center. Alternatively, communication device 1110 may be implemented in the form of one or more integrated-circuit (IC) chips, such as, but not limited to, one or more single-core processors, one or more multi-core processors, one or more reduced-instruction-set-computing (RISC) processors, or complex-instruction-set-computing (CISC) processors.

The communications device 1110 includes at least some of the components shown in fig. 11, such as the processor 1112. The communication means 1110 may also comprise one or more other components not relevant to the solution proposed by the present invention (e.g. an internal power supply, a display device and/or user interface means). For the sake of brevity, the above-described other components of the communication device 1110 are neither shown in fig. 11 nor described below.

Network device 1120 is part of an electronic device, which may be a network node such as a TRP, base station, small cell, router, or gateway. For example, network apparatus 1120 may be implemented in an eNodeB in an LTE, LTE-Advanced, or LTE-Advanced Pro network, or in a gbb in a 5G, NR, IoT, or NB-IoT network. Further, network device 1120 may be implemented in the form of one or more IC chips, such as, but not limited to, one or more single-core processors, one or more multi-core processors, one or more RISC processors, or one or more CISC processors.

Network device 1120 includes at least some of the components shown in fig. 11, such as processor 1122. The network apparatus 1120 also includes one or more other components (e.g., an internal power supply, a display device, and/or a user interface apparatus) not related to the proposed solution. For simplicity, the above-described components of network device 1120 are neither shown in fig. 11 nor described below.

In an aspect of the invention, any of processors 1112 and 1122 may be implemented in the form of one or more single-core processors, one or more multi-core processors, one or more RISC processors, or one or more CISC processors. That is, even though the singular term "processor" is used herein to refer to both the processor 1112 and the processor 1122, in the present disclosure, any of the processor 1112 and the processor 1122 may include multiple processors in some embodiments and a single processor in other embodiments. In another aspect, any of processors 1112 and 1122 may be implemented in hardware (and optionally firmware) with electronic components including, for example, but not limited to, one or more transistors, one or more diodes, one or more capacitors, one or more resistors, one or more inductors, one or more memristors, and/or one or more varactors configured for a particular purpose in accordance with the present disclosure. In other words, at least in some implementations of the invention, processors 1112 and 1122 are specific target machines that are specifically designed, arranged, and configured to perform specific tasks for codebook-based uplink transmissions in accordance with embodiments of the invention.

In some embodiments, the communications device 1110 also includes a transceiver 1116 coupled to the processor 1112 and capable of wirelessly transmitting and receiving data, signals, and information. In some embodiments, the transceiver 1116 is configured with a plurality of antenna ports (not shown), for example, four antenna ports. In some embodiments, the communications device 1110 also includes a memory 1114 coupled to the processor 1112 and capable of being accessed by the processor 1112 and having data stored therein. In some embodiments, network device 1120 also includes a transceiver 1126 coupled to processor 1122 and capable of wirelessly transmitting and receiving data, signals, and information. In some embodiments, network device 1120 also includes a memory 1124 coupled to processor 1122 and capable of being accessed by processor 1122 and storing data therein. Thus, communication device 1110 and network device 1120 wirelessly communicate with each other via transceiver 1116 and transceiver 1126, respectively.

To facilitate a better understanding, the following description of the operations, functions and capabilities of each of the communication device 1110 and the network device 1120 is provided in the context of a mobile communication environment in which the communication device 1110 is implemented in or as a communication device or UE and the network device 1120 is implemented in or as a network node (e.g., a gNB or TRP) of a wireless network (e.g., a 5G/NR mobile network).

In an aspect of the disclosure, the processor 1112 of the communications device 1110 can construct a codebook including a plurality of precoders. Further, processor 1112 may process information using the codebook. Additionally, processor 1112 may send the processed information to network device 1120 via transceiver 1116. In some embodiments, processor 1112 may select a candidate codebook from a single-order codebook or a dual-order codebook when constructing the codebook. And, the processor 1112 may perform permutation on the candidate precoders.

In some embodiments, when performing permutation on the candidate precoder, the processor 1112 may perform the permutation on the candidate precoder multiple times to construct the codebook. In some embodiments, the plurality of permutations may cover a plurality of MUBs, a plurality of codebooks specified in the third Generation Partnership Project (3 GPP) specification, or a combination thereof.

In some embodiments, processor 1112 may perform a number of operations in constructing the codebook. For example, processor 1112 may select an initial codebook from a plurality of codebooks specified in the 3GPP specification. Further, processor 1112 may expand the initial codebook to obtain the codebook by performing one or more permutations on the initial codebook using one or more permutation matrices. In some embodiments, the feedback overhead of the codebook may remain unchanged compared to the feedback overhead of the initial codebook.

In some embodiments, when performing permutation on the candidate precoders, the processor 1112 may select a permutation matrix from a plurality of permutation matrices. Further, the processor 1112 can apply the permutation matrix to the candidate precoder to enlarge the candidate precoder.

In some embodiments, in selecting the permutation matrix, the processor 1112 may dynamically or semi-statically receive signaling from the network apparatus 1120 indicating the selection of the permutation matrix used to construct the codebook.

In some embodiments, processor 1112 may receive RRC signaling or MAC CE as part of or independent of the CSR when receiving signaling.

In some embodiments, in selecting the permutation matrix, processor 1112 may select the permutation matrix based on an indication that is part of a codebook.

In some embodiments, each of the plurality of permutation matrices may correspond to a respective one or more antenna layout scenarios or one or more codewords.

In some embodiments, the candidate precoder may be a rank 2 precoder.

In some embodiments, the codebook may be a rank 2 codebook having the structure:

wherein the content of the first and second substances,

r is 0, 1, l is 0, 1, and

wherein, c_r，lRepresents a co-phase coefficient, wherein c_0，1＝1、c_1，0＝-c_1，1And c_1，0∈{1，j}，(k′_1，1，k′_2，1)∈{(0，0)，(O₁/2，0)，(O₁，0)，(O₁-3/2，0)}。

In some embodiments, in constructing the codebook, processor 1112 may construct the codebook according to the first structure described above:

can define a plurality of

k is 1,2, …,16 matrix:

1. eight matrices

k 1, …, 8 from

Where c is 0,2, [ phi ]₁1, j, or

2. Eight matrices C₂ ^(k)K 9, …,16 from

Wherein phi ₂1, j, -1, -j, and

the rank 2 precoder may be given by:

in some embodiments, in constructing the codebook, the processor 1112 may construct the codebook according to the second structure described above, and may define a plurality of codebooks

k is 1,2, …,16 matrix:

1. eight matrices

k 1, …, 8 from

Where c is 0,2, [ phi ]₁＝1，j。

2. Eight matrices

k 9, …,16 from

Wherein phi ₂1, j, -1, -j, and

the rank 2 precoder may be given by:

in some embodiments, in constructing the codebook, the processor 1112 may construct the codebook according to the third structure described above, and may define a plurality of codebooks

k is 1,2, …,4 matrix:

1. four

matrices

k

1,2, …,4 from

Wherein phi ₁1, j, and a rank 2 precoder may be given by:

or

Is from

Or

Any one of the eight matrices of (1), where phi₂＝1，j，-1，-j。

In some embodiments, in constructing the codebook, processor 1112 may expand the first codebook by applying a plurality of permutation matrices to the first codebook, constructing the codebook as antenna port re-indices.

In some embodiments, processor 1112 may receive signaling from network device 1120 via transceiver 1116 indicating an order in which multiple SRS resources are mapped to multiple antenna ports at communication device 1110 for uplink transmission. In some embodiments, a codebook may be used to configure each of the one or more antenna ports to map to any of the plurality of SRS resources for uplink transmission.

In some embodiments, processor 1112 may receive signaling from network device 1120 via transceiver 1116 indicating permutations related to the mapping of multiple SRS resources to multiple antenna ports at communication device 1110 for the order of uplink transmissions. In some embodiments, a codebook may be used to fixedly map antenna ports to multiple SRS resources for uplink transmission.

In some embodiments, the signaling further includes a PMI. In some embodiments, the permutation may be part of a PMI definition associated with the PMI.

In some embodiments, processor 1112 may receive signaling from network apparatus 1120 via transceiver 1116 indicating the CSR associated with the codebook. Further, processor 1112 may select one or more codewords in a codebook based on the CSR. In some embodiments, processor 1112 may use one or more codewords to send the processed information to network device 1120 when sending the processed information to network device 1120.

In some embodiments, upon receiving signaling from network device 1120 indicating a CSR, processor 1112 may receive the CSR with the bitmap via RRC signaling. In some embodiments, the length of the bitmap is equal to the number of precoders in the codebook.

Illustrative Process

FIG. 12 depicts an example process 1200 according to an embodiment of the invention. Process 1200, whether partial or complete, is an example embodiment of various processes, scenarios, schemes, methods, concepts and techniques related to codebook-based uplink transmission in wireless communications of the present invention. Process 1200 represents one aspect of a feature implementation of communications apparatus 1210. Process 1200 may include one or more operations, actions, or functions as illustrated by one or more of

steps

1210, 1220, and 1230, and sub-steps 1212 and 1214. Although illustrated as discrete steps, the various steps of process 1200 may be divided into additional steps, combined into fewer steps, or deleted as desired. Further, the steps of process 1200 may be performed in the order shown in FIG. 12, or in other orders, and one or more steps of process 1200 may be repeated one or more times. Process 1200 is implemented by a communication device 1110 or any suitable UE or machine type device. For illustrative purposes only, and without limitation, process 1200 is described below in the context of communication device 1110 as a UE and network device 1120 as a network node (e.g., a gNB) of a wireless network. Process 1200 begins at step 1210.

At step 1210, process 1200 involves processor 1112 of communications device 1110 constructing a codebook including a plurality of precoders. Process 1200 proceeds from step 1210 to step 1220.

At step 1220, process 1200 involves processor 1112 processing information using the codebook. From step 1220, process 1200 proceeds to step 1230.

At step 1230, process 1200 involves processor 1112 sending the processed information to network device 1120 via transceiver 1116.

In building the codebook, process 1200 further involves processor 1112 performing a number of operations represented by sub-steps 1212 and 1214.

At sub-step 1212, process 1200 involves processor 1112 selecting a candidate precoder from a single order codebook or a dual order codebook. Process 1200 proceeds from sub-step 1212 to sub-step 1214.

At sub-step 1214, process 1200 involves processor 1112 performing a permutation on the candidate precoders.

In some embodiments, when performing a permutation on a candidate precoder, process 1200 involves processor 1112 performing multiple permutations on the candidate precoder to construct a codebook. In some embodiments, the multiple permutations may cover multiple MUBs, multiple codebooks specified in the 3GPP specifications, or a combination thereof.

In some embodiments, process 1200 involves processor 1112 performing a number of operations in constructing the codebook. For example, process 1200 involves processor 1112 selecting an initial codebook from a plurality of codebooks specified in the 3GPP specification. Further, process 1200 involves processor 1112 enlarging the initial codebook by performing one or more permutations on the initial codebook using one or more permutation matrices to obtain the codebook. In some embodiments, the feedback overhead of the codebook may remain unchanged compared to the feedback overhead of the initial codebook.

In some embodiments, when performing permutation on the candidate precoders, process 1200 involves processor 1112 selecting a permutation matrix from a plurality of permutation matrices. Further, process 1200 involves processor 1112 applying the permutation matrix to the candidate precoder to enlarge the candidate precoder.

In some embodiments, in selecting the permutation matrix, process 1200 involves processor 1112 dynamically or semi-statically receiving signaling from network apparatus 1120 indicating a selection of the permutation matrix used to construct the codebook.

In some embodiments, process 1200 involves processor 1112 receiving RRC signaling or MAC CE as part of or independent of the CSR when receiving signaling.

In some embodiments, in selecting the permutation matrix, process 1200 involves processor 1112 selecting the permutation matrix based on an indication that is part of a codebook.

In some embodiments, the candidate precoder may be a rank 2 precoder.

In some embodiments, the codebook may be a codebook having the structure:

wherein the content of the first and second substances,

r is 0, 1, l is 0, 1, and

wherein, c_r，lRepresents a co-phase coefficient, wherein c_0，1＝1、c_1，0＝-c_1，1And c_1，0∈{1，j}，(k′_1，1，k′_2，1)∈{(0，0)，(O₁/2，0)，(O₁，0)，(O₁·3/2，0)}。

In some embodiments, in constructing the codebook, process 1200 involves processor 1112 constructing the codebook according to the first structure described above:

can define a plurality of

k is 1,2, …,16 matrix:

3. eight matrices

k 1, …, 8 from

Where c is 0,2, [ phi ]₁＝1，j, or

4. Eight matrices C₂ ^(k)K 9, …,16 from

Wherein phi ₂1, j, -1, -j, and

the rank 2 precoder may be given by:

in some embodiments, process 1200 involves processor 1112 constructing the codebook according to the second structure described above in constructing the codebook, and may define a plurality of codebooks

k is 1,2, …,1 matrix:

3. eight matrices

k 1, …, 8 from

Where c is 0,2, [ phi ]₁＝1，j。

4. Eight matrices

k 9, …,1 from

Wherein phi ₂1, j, -1, -j, and

the rank 2 precoder may be given by:

in some embodiments, process 1200 involves processor 1112 constructing the codebook according to the third structure described above in constructing the codebook, which may define a plurality of

k is 1,2, …,4 matrix:

2. four

matrices

k

1,2, …,4 from

Wherein phi ₁1, j, and

the rank 2 precoder may be given by:

or

Is from

Any one of the eight matrices of (1), where phi₂＝1，j，-1，-j。

In some embodiments, in constructing the codebook, process 1200 involves processor 1112 expanding the first codebook by constructing the codebook as antenna port re-indices by applying a plurality of permutation matrices to the first codebook.

In some embodiments, process 1200 further involves processor 1112 receiving, via transceiver 1116, signaling from network device 1120 indicating an order in which a plurality of SRS resources are mapped to a plurality of antenna ports at communication device 1110 for uplink transmission. In some embodiments, a codebook may be used to configure each of the one or more antenna ports to map to any of the plurality of SRS resources for uplink transmission.

In some embodiments, process 1200 further involves processor 1112 receiving, via transceiver 1116, signaling from network device 1120 indicating a permutation related to an order in which a plurality of SRS resources are mapped to a plurality of antenna ports at communication device 1110 for uplink transmission. In some embodiments, a codebook may be used to fixedly map antenna ports to multiple SRS resources for uplink transmission.

In some embodiments, process 1200 further involves processor 1112 performing additional operations. For example, process 1200 involves processor 1112 receiving signaling from network apparatus 1120 via transceiver 1116 indicating a CSR associated with a codebook. Further, process 1200 involves processor 1112 selecting one or more codewords in a codebook based on the CSR. In some embodiments, in sending the processed information to network device 1120, process 1200 involves processor 1112 sending the processed information to network device 1120 using one or more codewords.

In some embodiments, process 1200 involves processor 1112 receiving the CSR with the bitmap via RRC signaling when receiving signaling indicating the CSR from network device 1120. In some embodiments, the length of the bitmap is equal to the number of precoders in the codebook.

Supplementary notes

The subject matter described in this specification sometimes illustrates different components included within, or connected with, different other components. It is to be understood that the architectures depicted are merely examples, and that in fact many other architectures can be implemented which achieve the same functionality. In a conceptual sense, any arrangement of components to achieve the same functionality is effectively "associated" such that the desired functionality is achieved. Hence, any two components herein combined to achieve a particular functionality can be seen as "associated with" each other such that the desired functionality is achieved, irrespective of architectures or intermedial components. Likewise, any two components so associated can also be viewed as being "operably connected," or "operably coupled," to each other to achieve the desired functionality, and any two components capable of being so associated can also be viewed as being "operably couplable," to each other to achieve the desired functionality. Particular examples of operably couplable include but are not limited to physically mateable and/or physically interacting components and/or wirelessly interactable and/or wirelessly interacting components and/or logically interacting and/or logically interactable components.

In addition, with respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. Various singular/plural permutations may be expressly set forth in this disclosure for the sake of clarity.

Furthermore, those skilled in the art will understand that, in general, terms used in the present disclosure, particularly in the appended claims (e.g., bodies of the appended claims) are generally intended as "open" terms, e.g., the term "including" should be interpreted as "including but not limited to," the term "having" should be interpreted as "having at least," the term "includes" should be interpreted as "includes but is not limited to," etc. It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to embodiments containing only such one recitation, even when the claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an," e.g., "a" and/or "an" should be interpreted to mean "at least one" and "one or more" likewise with respect to the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should be interpreted to mean at least the recited number, e.g., the bare recitation of "two recitations," without other modifiers, means at least two recitations, or two or more recitations. Further, in those instances where a convention analogous to "A, B and at least one of C, etc." is used, in general, from the standpoint that one skilled in the art will understand the convention, such a configuration is contemplated, e.g., "a system having at least one of A, B and C" would include, but not be limited to, systems having only a, only B, only C, A and B together, a and C together, B and C together, and/or A, B and C together, etc. In other instances where a convention analogous to "A, B or at least one of C, etc." is used, in general, such a construction contemplates, in the sense one of skill in the art would understand the convention, that, for example, "a system having at least one of A, B or C" would include, but not be limited to, a system having only a, only B, only C, A and B together, a and C together, B and C together, and/or A, B and C together, etc. It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase "a or B" will be understood to include the possibility of "a" or "B" or "a and B".

From the foregoing, it will be appreciated that various embodiments of the invention have been described herein for purposes of illustration, and that various modifications may be made without deviating from the scope and spirit of the invention. Therefore, it is intended that the various embodiments disclosed herein not be limiting, with the true scope and spirit being indicated by the following claims.

Claims

1. A codebook-based uplink transmission method, comprising:

constructing, by a processor of a user equipment, a codebook including a plurality of precoders;

processing, by the processor, information using the codebook; and

sending, by the processor, the processed information to a network node of a wireless network,

wherein the constructing of the codebook comprises:

selecting a candidate precoder from a single-order codebook or a double-order codebook; and

performing a permutation on the candidate precoder, wherein the step of performing the permutation on the candidate precoder comprises:

selecting a permutation matrix from a plurality of permutation matrices; and

the selected permutation matrix is applied to the candidate precoder to expand the candidate precoder such that the number of codewords in the expanded candidate precoder is a multiple of the number of codewords in the precoder before expansion.

2. The codebook-based uplink transmission method of claim 1, wherein the performing of the permutation on the candidate precoder comprises performing a plurality of permutations on the candidate precoder to construct the codebook, and the plurality of permutations cover at least one of a plurality of codebooks specified in a plurality of mutual unbiased base, third generation partnership project specifications.

3. The codebook-based uplink transmission method as claimed in claim 1, wherein the construction of the codebook comprises:

selecting an initial codebook from a plurality of codebooks specified in the third generation partnership project specification; and

expanding the initial codebook by performing one or more permutations on the initial codebook having one or more permutation matrices to obtain the codebook,

wherein the feedback overhead of the codebook remains unchanged compared to the feedback overhead of the initial codebook.

4. The method of claim 1, wherein the selecting of the permutation matrix comprises dynamically or semi-statically receiving signaling from the network node indicating a selection of the permutation matrix used to construct the codebook.

5. The method of claim 4, wherein the receiving of the signaling comprises receiving radio resource control signaling or medium access control element as part of or independent of a codebook subset restriction.

6. The method of claim 1, wherein the selecting of the permutation matrix comprises selecting the permutation matrix based on an indication that is part of the codebook.

7. The codebook-based uplink transmission method of claim 1, wherein each of the plurality of permutation matrices corresponds to a corresponding one or more antenna layout scenarios or one or more codewords.

8. The codebook-based uplink transmission method of claim 1, wherein the candidate precoders comprise rank 2 precoders.

9. The codebook-based uplink transmission method of claim 1, wherein the codebook comprises a rank 2 codebook having a structure of:

wherein N is₁And N₂Is a positive integer and is a non-zero integer,

is corresponding to (k)₁+k′_1,l,k₂+k′_2,l) Of a predefined vector, k₁And k₁Is an integer of 0 or more, and

wherein, c_r,lRepresents a co-phase coefficient, wherein c_0,0＝1、c_0,1＝1、c_1,0＝-c_1,1And c_1,0∈{1,j}，(k′_1,1,k′_2,1)∈{(0,0),(O₁/2,0),(O₁,0),(O₁·3/2,0)}，O₁Are positive integers and multiples of 2.

10. The method of claim 1, wherein the constructing of the codebook comprises constructing the codebook according to the following structure:

is defined as a plurality of

Matrix, k ═ 1,2, …, 16:

eight matrices

From

Wherein v is_1+c,v_2+cIs a vector, c is 0,2, phi₁1, j, and

eight matrices C₂ ^(k)K 9, …,16 from

Wherein phi is₂＝1,j,-1,-j，v₁,v₂Is a vector, and

rank 2 precoder

Is given by_nIs a diagonal matrix with diagonal values of 1, e^jπ/2n、1、e^jπ/2n

11. The method of claim 1, wherein the constructing of the codebook comprises constructing the codebook according to a structure of the codebook defined by one of the following, a plurality of the following are defined

Matrix, k ═ 1,2, …, 16:

eight matrices

From

Wherein v is_1+c,v_2+cIs a vector, c is 0,2, phi₁＝1,j，

Eight matrices

From

Wherein phi is₂＝1,j,-1,-j，v₃,v₄Is a vector, and

rank 2 precoder

12. The method of claim 1, wherein the constructing of the codebook comprises constructing the codebook according to a structure of the codebook defined as a plurality of

Matrix, k ═ 1,2, …, 4:

four matrices

From

Wherein phi is₁1, j, and

rank 2 precoder

Is given by_nIs a diagonal matrix with diagonal values of 1, e^jπ/4n、1、e^jπ/4n

Or

Is from

Or

Any one of the eight matrices of (1),

wherein phi is₂＝1,j,-1,-j，v₁,v₂,v₃,v₄Are vectors.

13. The method of claim 1, wherein the constructing of the codebook comprises constructing the codebook as an antenna port re-index to expand a first codebook by applying a plurality of permutation matrices to the first codebook.

14. The codebook-based uplink transmission method of claim 1, further comprising:

receiving, by the processor, signaling from the network node indicating an order in which a plurality of sounding reference signal resources are mapped to a plurality of antenna ports at the user equipment for uplink transmission;

wherein each of the one or more antenna ports is configured to map to any of the sounding reference signal resources for uplink transmission using the codebook.

15. The codebook-based uplink transmission method of claim 1, further comprising:

receiving, by the processor, signaling from the network node indicating a permutation step related to an order in which a plurality of sounding reference signal resources are mapped to a plurality of antenna ports at the user equipment for uplink transmission,

wherein the antenna port is fixedly mapped to the plurality of sounding reference signal resources for uplink transmission using the codebook.

16. The codebook-based uplink transmission method of claim 15, wherein the signaling further includes a precoding matrix indicator, and the permuting step is a component of a precoding matrix indicator definition, wherein the precoding matrix indicator definition is related to the precoding matrix indicator.

17. The codebook-based uplink transmission method of claim 1, further comprising:

receiving, by the processor, signaling from the network node, the signaling indicating a codebook subset restriction associated with the codebook; and

selecting, by the processor, one or more codewords in the codebook based on the codebook subset restriction,

wherein the sending of the processed information to the network node comprises sending the processed information to the network node using the one or more codewords.

18. The method of claim 17, wherein the step of receiving the signaling indicating the codebook subset restriction from the network node comprises receiving the codebook subset restriction through radio resource control signaling, wherein the codebook subset restriction has a bitmap.

19. The codebook-based uplink transmission method of claim 18, wherein a length of the bitmap is equal to a number of precoders in the codebook.