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EP-3864913-B1 - METHOD AND APPARATUS FOR MULTIPLE PANEL AND/OR MULTIPLE BEAM CODEBOOK BASED PUSCH TRANSMISSIONS

EP3864913B1EP 3864913 B1EP3864913 B1EP 3864913B1EP-3864913-B1

Inventors

  • LIU, Bingchao
  • ZHU, CHENXI
  • XIAO, LINGLING

Dates

Publication Date
20260513
Application Date
20181011

Claims (15)

  1. A method performed by a user equipment, UE, (101) in a wireless communication system, the UE (101) having two panels (111, 113), the method for transmitting two or more codewords in one Physical Uplink Shared Channel, PUSCH, the method comprising: receiving Downlink Control Information, DCI, comprising two Sounding Reference Signal Resource Indicators, SRIs, and two Transmitted Precoding Matrix Indicators, TPMIs; performing codebook based PUSCH transmission according to the two SRIs and two TPMIs, respectively; and transmitting two Sounding Reference Signal, SRS, resources configured in two SRS resource sets, respectively, wherein the two SRS resources are used for the codebook based PUSCH transmission, wherein one SRS resource set is configured for a first panel (111) of the UE (101), and another SRS resource set is configured for a second panel (113) of the UE (101), and wherein each panel (111, 113) communicates with a respective base unit (103, 105) in the wireless communication system.
  2. The method of Claim 1, further comprising simultaneously transmitting the two SRS resources.
  3. The method of Claim 1, further comprising performing codeword-to-layer mapping, wherein a rank number for a first codeword of the two codewords is different from another rank number for a second codeword of the two codewords.
  4. The method of Claim 3, wherein the first codeword is mapped to two layers and the second codeword is mapped to one layer if the rank number of the first codeword is indicated as two, and the another rank number of the second codeword is indicated as one.
  5. The method of Claim 3, wherein the first codeword is mapped to three layers and the second codeword is mapped to one layer if the rank number of the first codeword is indicated as three, and the another rank number of the second codeword is indicated as one.
  6. The method of Claim 3, wherein the first codeword is mapped to three layers and the second codeword is mapped to two layers if the rank number of the first codeword is indicated as three, and the another rank number of the second codeword is indicated as two.
  7. The method of Claim 3, wherein the first codeword is mapped to one layer and the second codeword is mapped to four layers if the rank number of the first codeword is indicated as one, and the another rank number of the second codeword is indicated as four.
  8. The method of Claim 3, wherein the first codeword is mapped to two layers and the second codeword is mapped to four layers if the rank number of the first codeword is indicated as two, and the another rank number of the second codeword is indicated as four.
  9. The method of Claim 3, wherein the first codeword is mapped to four layers and the second codeword is mapped to three layers if the rank number of the first codeword is indicated as four, and the another rank number of the second codeword is indicated as three.
  10. The method of Claim 1, further comprising: generating a precoding matrix according to two sub-matrices respectively indicated by the two TPMIs; and performing precoding in accordance with the precoding matrix.
  11. The method of Claim 10, wherein a first sub-matrix of the two sub-matrices is arranged at a first position on a diagonal of the precoding matrix, wherein a second sub-matrix of the two sub-matrices is arranged at a second position on the diagonal of the precoding matrix, and wherein the first position is different from the second position.
  12. The method of Claim 1, wherein the TPMI is ignored if only two antennas are used for the codebook based PUSCH transmission.
  13. A user equipment, UE, (101) for transmitting two or more codewords in one Physical Uplink Shared Channel, PUSCH, in a wireless communication system, the UE (101) comprising: two panels (111, 113), at least one memory; and at least one processor coupled with the at least one memory; wherein the UE (101) is configured to: receive Downlink Control Information, DCI, comprising two Sounding Reference Signal Resource Indicators, SRIs, and two Transmitted Precoding Matrix Indicators, TPMIs; perform codebook based PUSCH transmission according to the two SRIs and two TPMIs, respectively; and transmit two Sounding Reference Signal, SRS, resources configured in two SRS resource sets, respectively, wherein the two SRS resources are used for the codebook based PUSCH transmission, wherein one SRS resource set is configured for a first panel (111) of the UE (101), and another SRS resource set is configured for a second panel (113) of the UE (101), and wherein each panel (111, 113) communicates with a respective base unit (103, 105) in the wireless communication system.
  14. The UE (101) of Claim 13, wherein the UE (101) is further configured to simultaneously transmit the two SRS resources.
  15. The UE (101) of Claim 13, wherein the UE (101) is further configured to perform codeword-to-layer mapping, wherein a rank number for a first codeword of the two codewords is different from another rank number for a second codeword of the two codewords.

Description

TECHNICAL FIELD The present disclosure generally relates to a method and apparatus for communication, and more specifically, to a method and apparatus for codebook based PUSCH transmissions. In particular, the present disclosure relates to a method performed by a user equipment and a user equipment. BACKGROUND OF THE INVENTION Codebook based Uplink (UL) transmission is supported in New Radio (NR) Release 15, where only transmission from a single panel using a single beam is supported. Single panel based codebook transmission on Physical Uplink Shared Channel (PUSCH) can be supported in Release 15 by using only one Sounding Reference Signal Resource Indicator (SRI) and one Transmitted Precoding Matrix Indicator (TPMI) indicated by the Downlink Control Information (DCI). Protocol of multiple panel and/or multiple beam UL Multi-input Multi-output (MIMO) transmission will be introduced in NR Release 16. In Long-Term Evolution (LTE) radio access network, multiple Tx/Rx Point (TRP) UL transmission is provided as UL Coordinated Multi-Point (CoMP) transmission. However, LTE radio access network only uses low frequency band, and performs PUSCH transmission to all CoMP Node with omni-directional beams. NR radio access network may use directional UL beams to perform transmission over Frequency Range 2 (FR2), which ranges from 6GHz to 52.6GHz. Thus, a new mechanism is required to implement UL multiple panel and multiple beam transmission in FR2. R1-1710057 is a 3GPP discussion document titled "Considerations on UL beam management" submitted by CATT at TSG RAN WG1 NR Ad-Hoc#2 in Qingdao, China, on 27th June 2017, and explains that a UE can be configured with multiple SRS resources, and that based on uplink measurement, TRP can choose a preferred SRS resource and signals its index (SRI) to the UE; the UE may then use the beam of the indicated SRS for future uplink transmissions. BRIEF SUMMARY OF THE INVENTION The invention is defined by the appended claims. Claim 1 defines a method performed by a user equipment and claim 13 defines a user equipment. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an example block diagram of a wireless communication network according to an embodiment of the present disclosure.FIG. 2 illustrates a partial functional block diagram of a UE for mapping two codewords to four layers according to an embodiment of the present disclosure.FIG. 3 illustrates a partial functional block diagram of a UE for mapping two codewords to three layers according to an embodiment of the present disclosure.FIG. 4 illustrates a partial functional block diagram of a UE for mapping two codewords to six layers according to an embodiment of the present disclosure.FIG. 5 illustrates an example block diagram of a User Equipment (UE) according to an embodiment of the present disclosure.FIG. 6 illustrates an example block diagram of a base station according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION The detailed description of the appended drawings is intended as a description of the currently preferred embodiments of the present invention, and is not intended to represent the only form in which the present invention may be practiced. It should be understood that the same or equivalent functions may be accomplished by different embodiments that are intended to be encompassed within the scope of the present invention. Embodiments provide the method and apparatus for multiple panel and multiple beam codebook based PUSCH transmission. To facilitate understanding, embodiments are provided under specific network architecture and new service scenarios, such as 3GPP NR, 3GPP Long Term Evolution (LTE) Release 8 and so on. It is contemplated that, with the development of network architecture and new service scenarios, the embodiments in the present disclosure are also applicable to similar technical problems. FIG. 1 illustrates a wireless communication network 100 according to an embodiment of the present disclosure. As shown in FIG. 1, the wireless communication network 100 includes a UE 101 and base stations 103, 105 and 107. It is contemplated that the wireless communication network 100 may include more UE(s) in some other embodiments of the subject application. Similarly, it is also contemplated that the wireless communication network 100 may include more or less base station(s) in some other embodiments of the subject application. The UE 101 may include computing devices, such as desktop computers, laptop computers, personal digital assistants (PDAs), tablet computers, smart televisions (e.g., televisions connected to the Internet), set-top boxes, game consoles, security systems (including security cameras), vehicle on-board computers, network devices (e.g., routers, switches, and modems), device(s) that constitutes internet of things (IoT), or the like. According to an embodiment of the present disclosure, the UE 101 may include a portable wireless communication device, a smart ph