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US-12621032-B2 - Method for beam management in sidelink communication

US12621032B2US 12621032 B2US12621032 B2US 12621032B2US-12621032-B2

Abstract

A method for beam management in side-link communication between User Equipment (UEs) ( 104 ) operating in a wireless communication network ( 100 ) is described. The method comprises transmitting a reference signal using at least one beam by a first UE ( 104 - 1 ). The first UE ( 104 - 1 ) receives a feedback report of the at least one beam based on the reference signal from the second UE ( 104 - 2, 104 - 4 ). The feedback report of the at least one beam comprises at least one of UE identifier (ID), beam ID, beam strength, and beam validity. The first UE ( 104 - 1 ) updates entries of a beam management table based on the feedback report.

Inventors

  • Anil Kumar
  • Abhijeet Abhimanyu Masal
  • Vikram Singh
  • Jeniston Deviraj Klutto Milleth
  • Bhaskar Ramamurthi

Assignees

  • CENTRE OF EXCELLENCE IN WIRELESS TECHNOLOGY
  • INDIAN INSTITUTE OF TECHNOLOGY MADRAS (IIT Madras)

Dates

Publication Date
20260505
Application Date
20230207
Priority Date
20220207

Claims (20)

  1. 1 . A method of beam management in side-link communication between User Equipment (UEs) operating in a wireless communication network, the method comprising: measuring, by an at least one second UE, at least one beam strength of a plurality of beams received from an at least one first UE over at least one reference signal, wherein the beam strengths are measured as a function of at least one of a Side-link Synchronization Signal Block (S-SSB)-Reference Signal Receiver Power (RSRP), Side-link Channel State Information Reference Signal (SL-CSI-RS)-Reference Signal Receiver Power (RSRP), SL-CSI-RS-Signal to Interference Plus Noise Ratio (SINR), and S-SSB-Signal to Interference Plus Noise Ratio (SINR); comparing the at least one beam strength of the plurality of beams with a threshold value, wherein the threshold value is a function of at least one of a S-SSB-RSRP threshold value, a S-SSB-SINR threshold value, a SL-CSI-RS-RSRP threshold value, and a SL-CSI-RS-SINR threshold value; selecting, by the at least one second UE, the at least one beam based on the comparison; and reporting, by the at least one second UE, at least one information of the at least one beam to the at least one first UE, wherein the at least one beam selected by the at least one second UE using a S-SSB beam is reported, in a time instant (T slotgap ) after a last S-SSB is transmitted over a S-SSB period, and wherein the last S-SSB is transmitted in a slot with a value determined by: timeoffsetSSBSL+timeIntervalSSBSL* N S-SSB −1 wherein timeoffsetSSB-SL indicates an offset in terms of slots from a start of the period to the slot in which a first S-SSB is transmitted, wherein timeIntervalSSB-SL indicates a slot interval between consecutive S-SSBs, and wherein No S-SSB represents a number of S-SSBs transmitted in different directions using different beams over the S-SSB-period and an S-SSB index (i S-SSB ) within the number of S-SSBs in the period.
  2. 2 . The method as claimed in claim 1 , further comprising: transmitting, by the at least one first UE, at least one reference signal using at least one beam; receiving, by the at least one first UE from the at least one second UE, a feedback report of the at least one beam based on the at least one reference signal, wherein the feedback report of the at least one beam comprises at least one of UE identifier (ID), beam ID, beam strength, and beam validity; and updating, by the at least one first UE, entries of a beam management table based on the feedback report.
  3. 3 . The method as claimed in claim 2 , further comprising scheduling, by the at least one first UE, the transmission of the at least one beam using the beam management table.
  4. 4 . The method as claimed in claim 2 , further comprising transmitting, by the at least one first UE, the reference signal when the at least one first UE determines that the entries of the beam management table is one of unknown and invalid.
  5. 5 . The method as claimed in claim 2 , wherein the reference signal is at least one of S-SSB and SL-CSI-RS.
  6. 6 . The method as claimed in claim 5 , wherein a plurality of SL-CSI-RS beams multiplexed in at least one of time, frequency, and space, are transmitted in different directions.
  7. 7 . The method as claimed in claim 6 , wherein the plurality of SL-CSI-RS beams are configured using at least one of the Radio Resource Control (RRC) message, Medium Access Control-Control Element (MAC-CE) message, Downlink Control Information (DCI), and Sidelink Control Information (SCI).
  8. 8 . The method as claimed in claim 5 , wherein the S-SSB is functions of time offset, time interval, number of S-SSBs transmitted in different directions using different beams over time, and S-SSB index within the number of S-SSBs in the S-SSB period.
  9. 9 . The method as claimed in claim 1 , wherein the at least one beam is one of the S-SSB beam and an SL-CSI-RS beam.
  10. 10 . The method as claimed in claim 1 , wherein the reporting of at least one information of the at least one beam comprises at least one of a beam ID, beam-strength, and beam validity.
  11. 11 . The method as claimed in claim 10 , wherein the reporting of the at least one information comprises transmission of at least one of an absolute value and relative value of the at least one information of the at least one beam in predetermined resources.
  12. 12 . The method as claimed in claim 11 , wherein the at least one information is transmitted as a quantized value.
  13. 13 . The method as claimed in claim 10 , wherein the beam ID is log 2 (N) bit long for one of N beams, wherein N is a number of at least one of the SL-CSI-RS beam and the S-SSB-beam.
  14. 14 . The method as claimed in claim 10 , wherein the beam ID is N bits long, wherein a bit position in the beam ID corresponds to the beam to be reported.
  15. 15 . The method as claimed in claim 14 , wherein the bit position of a bit map is set to one of 0 and 1 if the corresponding beam is to be reported, otherwise set to compliment of one of 0 and 1.
  16. 16 . The method as claimed in claim 10 , wherein the beam strength is reported using M*b bits, wherein M is number of bits per beam strength and b is number of beam strength to be reported.
  17. 17 . The method as claimed in claim 1 , wherein the at least one information of the at least one beam is reported by the at least one second UE using at least one time-frequency resource, and the at least one time-frequency resources is provided by one of the at least one first UE and a Base Station (BS).
  18. 18 . The method as claimed in claim 1 , wherein number of beams to be selected is configured by the at least one first UE.
  19. 19 . The method as claimed in claim 1 , wherein the reporting of the at least one information is performed using fixed time-frequency resources allocated to the at least one beam.
  20. 20 . The method as claimed in claim 1 , wherein the S-SSB index (is-SSB) is determined using: i S-SSB =(slotindex−timeoffsetSSBSL)/timeIntervalSSBSL wherein slot index indicates the slot in which S-SSB is transmitted in the S-SSB period.

Description

FIELD OF THE INVENTION The present invention relates to sidelink communication in a wireless communication system, and more particularly to a method for beam management in sidelink communication system. BACKGROUND OF THE INVENTION Sidelink communication in New Radio (NR) may be used for sharing information between devices, without or with minimal involvement of a base station (gNB). NR requires a new design of a physical layer different from conventional design used for Enhanced Mobile Broadband (eMBB). In the new design of the physical layer, PC5 interface is defined for communicating nodes among themselves in the 3rd Generation Partnership Project (3GPP). 3GPP Release 12 has introduced direct device-to-device (D2D) communication for proximity services using cellular technologies. Based on the D2D communication work in Rel-12, a first cellular V2X (C-V2X) was developed on 4G Long Term Evolution (LTE) air interface under Rel-14 and was further enhanced during Rel-15. 3GPP has developed a new cellular V2X standard during Rel-16 based on 5G NR air interface. In Rel-17, new enhancements such as power saving and inter-UE coordination have been made to improve the existing resource allocation method. In the conventional methods, Side-link Synchronization Signal Block (S-SSB) and/or Side-link Channel State Information Reference Signal (SL-CSI-RS) is used in sidelink communication for improving power saving and inter-UE coordination. However, the conventional methods do not explicitly use S-SSB and SL-CSI-RS for beam management. Rel-17 does not define an explicit beam management method. Thus, there is a need of a method of beam management in NR sidelink communication, which addresses the above-mentioned shortcomings. OBJECTS OF THE INVENTION A general objective of the present invention is to provide a method for beam management in NR sidelink communication. Another objective of the present invention is to provide a method validating a reported sidelink beam using Artificial Neural Network (ANN). SUMMARY OF THE INVENTION The summary is provided to introduce aspects related to beam management in side-link communication between User Equipment (UEs) operating in a wireless communication network, and the aspects are further described below in the detailed description. This summary is not intended to identify essential features of the claimed subject matter nor is it intended for use in determining or limiting the scope of the claimed subject matter. The present invention relates to beam management in side-link communication between User Equipment (UEs) operating in a wireless communication network. The method may comprise transmitting, by at least one first UE, at least one reference signal using at least one beam. The at least one first UE may receives feedback report of the at least one beam from at least one second UE based on the at least one reference signal. The feedback report of the at least one beam comprises at least one of UE identifier (ID), beam ID, beam strength, and beam validity. Entries of a beam management table is updated based on the feedback report. In an aspect, the at least one first UE may schedule the transmission of the at least one beam using the beam management table. In an aspect, the at least one first UE may transmit the reference signal when the at least one first UE determines that the entries of the beam management table are one of unknown and invalid. In an aspect, the reference signal may be at least one of a Side-link Synchronization Signal Block (S-SSB) and a Side-link Channel State Information Reference Signal (SL-CSI-RS). In an aspect, a plurality of SL-CSI-RS beams may be multiplexed in at least one of time, frequency, and space, are transmitted in different directions. In an aspect, the plurality of SL-CSI-RS beams may be configured using at least one of the Radio Resource Control (RRC) message, Medium Access Control-Control Element (MAC-CE) message, Down link Control Information (DCI), and Side-link Control Information (SCI). In an aspect, the S-SSB may be functions of time offset, time interval, number of S-SSBs transmitted in different directions using different beams over time, and S-SSB index within the number of S-SSBs in a S-SSB period. In an aspect the at least one second UE may measure at least one beam strength of a plurality of beams received from the at least one first UE over at least one reference signal. The beam strengths are measured as a function of at least one of S-SSB-Reference Signal Receiver Power (RSRP), SL-CSI-RS-Reference Signal Receiver Power (RSRP), SL-CSI-RS-Signal to Interference Plus Noise Ratio (SINR), and S-SSB-Signal to Interference Plus Noise Ratio (SINR). The at least one second UE may compare the at least one beam strength of the plurality of beams with a threshold value. The threshold value may be a function of at least one of a S-SSB-RSRP threshold value, a S-SSB-SINR threshold value, a SL-CSI-RS-RSRP threshold value, and a SL-CSI-RS-SINR