Search

CN-122003941-A - Receive antenna group design for UE complexity reduction

CN122003941ACN 122003941 ACN122003941 ACN 122003941ACN-122003941-A

Abstract

Certain aspects of the present disclosure provide techniques for receive antenna group design for User Equipment (UE) complexity reduction. An example method performed at a UE generally includes receiving Downlink Control Information (DCI) that schedules the UE to receive a Physical Downlink Shared Channel (PDSCH) transmission on a first UE antenna group and a second UE antenna group, determining two sets of demodulation reference signal (DMRS) ports corresponding to the first UE antenna group and the second UE antenna group, and receiving the PDSCH using the first UE antenna group and the second UE antenna group in accordance with the determination.

Inventors

  • DAI JING
  • HUANG DIE
  • WU LIANGMING
  • XU HAO

Assignees

  • 高通股份有限公司

Dates

Publication Date
20260508
Application Date
20231016

Claims (20)

  1. 1. A method for wireless communication at a User Equipment (UE), the method comprising: Receiving Downlink Control Information (DCI) that schedules the UE to receive a Physical Downlink Shared Channel (PDSCH) transmission on a first UE antenna group and a second UE antenna group; Determining two sets of demodulation reference signal (DMRS) ports corresponding to the first and second UE antenna groups, and The PDSCH is received using the first UE antenna group and the second UE antenna group in accordance with the determination.
  2. 2. The method of claim 1, wherein the determining is based on an indication provided via the DCI.
  3. 3. The method of claim 2, wherein the indication provided via the DCI comprises an antenna port indication field indicating a mapping of the two sets of DMRS ports to two Code Division Multiplexing (CDM) groups of the DMRS ports.
  4. 4. The method of claim 2, wherein the DCI includes code points indicating how the two sets of DMRS ports are mapped to the first UE antenna set and the second UE antenna set.
  5. 5. The method of claim 4, wherein the value of the code point indicates that the DMRS port is grouped to one of a plurality of predefined number combinations of UE antenna groups.
  6. 6. The method of claim 1, wherein the determining is based on a most recent Channel State Information (CSI) report sent by the UE.
  7. 7. The method of claim 1, wherein the DCI: a number of DMRS ports indicating the PDSCH is less than or equal to four, and The PDSCH is scheduled as two Codewords (CW) for the two sets of DMRS ports.
  8. 8. The method of claim 1, further comprising transmitting a Channel State Information (CSI) report with information corresponding to the first UE antenna group and the second UE antenna group.
  9. 9. The method of claim 8, wherein the information comprises at least one of: Separate ranks for the first and second UE antenna groups, or Separate Channel Quality Indicators (CQIs) for the first and second UE antenna groups.
  10. 10. The method of claim 9, wherein the separate ranks are reported in a first CSI portion, and wherein one of the separate ranks may be zero.
  11. 11. The method of claim 9, wherein the CQI for the second UE antenna group is included in a second CSI portion only if a corresponding rank for the second UE antenna group is non-zero.
  12. 12. The method of claim 8, wherein the information comprises a Precoding Matrix Indicator (PMI) corresponding to a total rank reported for the first UE antenna group and the second UE antenna group.
  13. 13. The method according to claim 12, wherein: the PMI includes two sets of layers corresponding to the first and second UE antenna groups, and Two sets of orthogonal spatial domain bases are associated with the two sets of layers.
  14. 14. The method of claim 1, the method further comprising: receiving configuration information configuring the UE with at least one Sounding Reference Signal (SRS) resource, and And transmitting SRS through the first antenna group and the second antenna group according to the configuration information.
  15. 15. The method according to claim 14, wherein: The configuration information configures different SRS resources within a set of resources for transmitting the SRS via the first antenna group and the second antenna group, and The different SRS resources are transmitted within a threshold duration.
  16. 16. The method of claim 14, wherein the configuration information configures the UE with different ports within SRS resources for transmitting the SRS via the first antenna group and the second antenna group.
  17. 17. A method for wireless communication at a network entity, the method comprising: Transmitting Downlink Control Information (DCI) transmitted by a scheduling User Equipment (UE) on a first UE antenna group and a second UE antenna group to receive a Physical Downlink Shared Channel (PDSCH); Determining two sets of demodulation reference signal (DMRS) ports corresponding to the first and second UE antenna groups, and And transmitting the PDSCH by using the DMRS according to the determination.
  18. 18. The method of claim 17, wherein the DCI includes an indication of the determination.
  19. 19. The method of claim 18, wherein the indication included in the DCI comprises an antenna port indication field indicating a mapping of the two sets of DMRS ports to two Code Division Multiplexing (CDM) groups of the DMRS ports.
  20. 20. The method of claim 18, wherein the DCI includes code points indicating how the two sets of DMRS ports are mapped to the first UE antenna set and the second UE antenna set.

Description

Receive antenna group design for UE complexity reduction Technical Field Aspects of the present disclosure relate to wireless communications, and more particularly to techniques for receive antenna group design for User Equipment (UE) complexity reduction. Background Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcast, or other similar types of services. These wireless communication systems may employ multiple-access techniques that are capable of supporting communication with several users by sharing the available wireless communication system resources with those users. Despite the tremendous technological advances made over the years in wireless communication systems, challenges remain. For example, complex and dynamic environments may still attenuate or block signals between a wireless transmitter and a wireless receiver. Accordingly, there is a continuing desire to improve the technical performance of wireless communication systems, including, for example, improving the speed and data carrying capacity of communications, improving the efficiency of use of shared communication media, reducing the power used by transmitters and receivers in performing communications, improving the reliability of wireless communications, avoiding redundant transmissions and/or receptions and associated processing, improving the coverage area of wireless communications, increasing the number and types of devices that can access the wireless communication system, increasing the ability of different types of devices to communicate with each other, increasing the number and types of wireless communication media available for use, and the like. Accordingly, there is a need for further improvements in wireless communication systems to overcome the foregoing technical challenges and others. Disclosure of Invention One aspect provides a method for wireless communication at a User Equipment (UE). The method includes receiving Downlink Control Information (DCI) that schedules the UE to receive a Physical Downlink Shared Channel (PDSCH) transmission on a first UE antenna group and a second UE antenna group, determining two sets of demodulation reference signal (DMRS) ports corresponding to the first UE antenna group and the second UE antenna group, and receiving the PDSCH using the first UE antenna group and the second UE antenna group according to the determination. Another aspect provides a method for wireless communication at a network entity. The method includes transmitting Downlink Control Information (DCI) that a scheduling User Equipment (UE) receives a Physical Downlink Shared Channel (PDSCH) transmission on a first UE antenna group and a second UE antenna group, determining two sets of demodulation reference signal (DMRS) ports corresponding to the first UE antenna group and the second UE antenna group, and transmitting the PDSCH using the DMRS according to the determination. Other aspects provide an apparatus operable, configured, or otherwise adapted to perform any one or more of the foregoing methods and/or those described elsewhere herein, a non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of the apparatus, cause the apparatus to perform the foregoing methods and those described elsewhere herein, a computer program product embodied on a computer-readable storage medium comprising code for performing the foregoing methods and those described elsewhere herein, and/or an apparatus comprising means for performing the foregoing methods and those described elsewhere herein. By way of example, an apparatus may comprise a processing system, a device with a processing system, or a processing system cooperating over one or more networks. For purposes of illustration, the following description and the annexed drawings set forth certain features. Drawings The drawings depict certain features of the various aspects described herein and are not intended to limit the scope of the disclosure. Fig. 1 depicts an example wireless communication network. Fig. 2 depicts an example exploded base station architecture. Fig. 3 depicts aspects of an example base station and an example user equipment. Fig. 4A, 4B, 4C, and 4D depict various example aspects of data structures for a wireless communication network. Fig. 5A and 5B depict example diagrams illustrating single and double DMRS symbols for Physical Downlink Shared Channel (PDSCH) demodulation reference signal (DMRS) type 1. Fig. 6A and 6B depict example diagrams illustrating single DMRS symbols and dual DMRS symbols for PDSCH DMRS type 2. Fig. 7 depicts an example diagram illustrating mutual interference caused by transmitted signals pre-decoded to target different groups of receive antennas. Fig. 8 depicts a call flow diagram illustrating example communications between a UE and a network entity in accordance with certain aspects of