US-12627348-B2 - Relay selection for multi-relay communications

US12627348B2US 12627348 B2US12627348 B2US 12627348B2US-12627348-B2

Abstract

Wireless communications systems and methods related to routing communications in a multiple-relay environment are provided. A base station (BS) transmits, to one or more wireless communication devices, a reference signal configuration indicating one or more reference signal resources. The base station receives, from a first wireless communication device of the one or more wireless communication devices, a channel state report based on one or more reference signals in the one or more reference signal resources. The channel state report includes channel measurement information for one or more links, each link connecting a wireless communication device of the one or more wireless communication devices to a user equipment (UE). The BS transmits, to the UE via a second wireless communication device of the one or more wireless communication devices based on the channel state report, a data signal.

Inventors

Luanxia YANG
Changlong Xu
Shaozhen Guo
Jing Sun
Xiaoxia Zhang
Rajat Prakash
Siyi Chen

Assignees

QUALCOMM INCORPORATED

Dates

Publication Date: 20260512
Application Date: 20210225

Claims (20)

1 . A method of wireless communication performed by a base station (BS), the method comprising: transmitting, to one or more wireless communication devices configured to operate as one or more relays, a reference signal configuration indicating one or more reference signal resources associated with one or more reference signals generated by the one or more wireless communication devices, wherein the one or more reference signals are different from the reference signal configuration; receiving, from a first wireless communication device of the one or more wireless communication devices and in accordance with the reference signal configuration, a channel state report based on the one or more reference signals in the one or more reference signal resources, wherein the channel state report includes channel measurement information for one or more links, each link connecting a wireless communication device of the one or more wireless communication devices to a user equipment (UE); and transmitting, to the UE via a second wireless communication device of the one or more wireless communication devices based on the channel state report, a data signal.
2 . The method of claim 1 , further comprising: selecting, based on a location of the UE, the one or more wireless communication devices.
3 . The method of claim 1 , wherein each wireless communication device of the one or more wireless communication devices is a UE.
4 . The method of claim 1 , wherein the one or more reference signals include at least one of a channel state information reference signal (CSI-RS) or a synchronization signal block (SSB).
5 . The method of claim 1 , wherein the channel measurement information includes at least one of a reference signal receive power (RSRP), a signal-to-interference-plus-noise ratio (SINR), a CSI-RS resource indicator (CRI), or a synchronization signal block (SSB) index for each link of the one or more links.
6 . The method of claim 1 , wherein the channel state report includes channel measurement information for fewer links than a number of wireless communication devices in the one or more wireless communication devices.
7 . The method of claim 1 , wherein the first wireless communication device and the second wireless communication device are different wireless communication devices.
8 . The method of claim 1 , wherein the first wireless communication device and the second wireless communication device are the same wireless communication device.
9 . A method of wireless communication performed by a wireless communication device configured to operate as a relay, the method comprising: receiving, from a base station (BS), a reference signal configuration indicating one or more reference signal resources; transmitting, to a user equipment (UE) in accordance with the reference signal configuration, a first reference signal generated by the wireless communication device, in a first reference signal resource of the one or more reference signal resources, wherein the first reference signal is different from the reference signal configuration; receiving, from the UE, a first channel state report including channel measurement information for a link between the wireless communication device and the UE based on the first reference signal; receiving, from the UE, a second reference signal in a second reference signal resource of the one or more reference signal resources; and transmitting, to the BS, a second channel state report based on the second reference signal.
10 . The method of claim 9 , wherein the first reference signal is a channel state information reference signal (CSI-RS).
11 . The method of claim 9 , wherein the second reference signal is a sounding reference signal (SRS).
12 . The method of claim 9 , wherein the channel measurement information includes at least one of a reference signal receive power (RSRP), signal-to-interference-plus-noise ratio (SINR), CSI-RS resource indicator (CRI), or a synchronization signal block (SSB) index.
13 . The method of claim 9 , further comprising: transmitting, to the BS, a communication signal including the first channel state report.
14 . The method of claim 13 , wherein the transmitting the first channel state report includes transmitting the first channel state report via a physical uplink shared channel (PUSCH).
15 . The method of claim 13 , further comprising: receiving, from the BS, a data signal based on at least one of the first channel state report or the second channel state report; and transmitting, to the UE, the data signal.
16 . A method of wireless communication performed by a user equipment (UE), the method comprising: receiving, from a first wireless communication device of one or more wireless communication devices configured to operate as one or more relays, a reference signal configuration indicating one or more reference signal resources; receiving one or more reference signals, generated by the one or more wireless communication devices, in the one or more reference signal resources in accordance with the reference signal configuration, each of the one or more reference signals being received from a corresponding wireless communication device of the one or more wireless communication devices, the one or more reference signals being different from the reference signal configuration; transmitting, to a base station (BS) via the first wireless communication device, a first channel state report including channel measurement information for one or more links based on the one or more reference signals, each link connecting a wireless communication device of the one or more wireless communication devices to the UE; and receiving, from the BS via a second wireless communication device of the one or more wireless communication devices, a data signal based on the first channel state report.
17 . The method of claim 16 , wherein the one or more reference signals includes one or more channel state information reference signals (CSI-RSs).
18 . The method of claim 16 , further comprising: receiving, from the first wireless communication device, a second reference signal configuration indicating one or more additional reference signal resources; and transmitting, to the one or more wireless communication devices, one or more additional reference signals in the one or more additional reference signal resources.
19 . The method of claim 18 , wherein the one or more additional reference signals include one or more sounding reference signals (SRSs).
20 . The method of claim 16 , wherein the first wireless communication device and the second wireless communication device are different wireless communication devices.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present application is a 35 U.S.C. 371 National Phase entry of Patent Cooperation Treaty (PCT) Application No. PCT/CN2021/077823, filed Feb. 25, 2021, which is hereby expressly incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to wireless communication systems, and more particularly to performing communications between devices having access to multiple relays. INTRODUCTION Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). A wireless multiple-access communications system may include a number of base stations (BSs), each simultaneously supporting communications for multiple communication devices, which may be otherwise known as user equipment (UE). To meet the growing demands for expanded mobile broadband connectivity, wireless communication technologies are advancing from the long term evolution (LTE) technology to a next generation new radio (NR) technology, which may be referred to as 5th Generation (5G). For example, NR is designed to provide a lower latency, a higher bandwidth or a higher throughput, and a higher reliability than LTE. NR is designed to operate over a wide array of spectrum bands, for example, from low-frequency bands below about 1 gigahertz (GHz) and mid-frequency bands from about 1 GHz to about 6 GHz, to high-frequency bands such as millimeter wave (mmWave) bands. NR is also designed to operate across different spectrum types, from licensed spectrum to unlicensed and shared spectrum. Spectrum sharing enables operators to opportunistically aggregate spectrums to dynamically support high-bandwidth services. Spectrum sharing can extend the benefit of NR technologies to operating entities that may not have access to a licensed spectrum. One approach to providing high-reliability communication is to use relays to facilitate communication between a base station (BS) and a user equipment (UE). A relay device, which may itself be a UE, may be used in situations where a UE and BS are distant. For example, a UE may be positioned at a distance far from the BS where a direct communication link between the UE and the BS would be unreliable, or where communication through one or more relays would be more reliable than a direct link. Relays positioned between the UE and the BS may forward traffic between the UE and BS. Relays may transmit traffic through other relays, with communication between the UE and the BS involving multiple hops based on the number of relays between the UE and BS. BRIEF SUMMARY OF SOME EXAMPLES The following summarizes some aspects of the present disclosure to provide a basic understanding of the discussed technology. This summary is not an extensive overview of all contemplated features of the disclosure and is intended neither to identify key or critical elements of all aspects of the disclosure nor to delineate the scope of any or all aspects of the disclosure. Its sole purpose is to present some concepts of one or more aspects of the disclosure in summary form as a prelude to the more detailed description that is presented later. In one aspect of the disclosure, a method of wireless communication performed by a base station (BS) includes transmitting, to one or more wireless communication devices, a reference signal configuration indicating one or more reference signal resources. The method further includes receiving, from a first wireless communication device of the one or more wireless communication devices, a channel state report based on one or more reference signals in the one or more reference signal resources, wherein the channel state report includes channel measurement information for one or more links, each link connecting a wireless communication device of the one or more wireless communication devices to a user equipment (UE). The method further includes transmitting, to the UE via a second wireless communication device of the one or more wireless communication devices based on the channel state report, a data signal. In an additional aspect of the disclosure, a method of wireless communication performed by a wireless communication device includes receiving, from a BS, a reference signal configuration indicating one or more reference signal resources. The method further includes transmitting, to a UE, a first reference signal in a first reference signal resource of the one or more reference signal resources. The method further includes receiving, from the UE, a first channel state report including channel measurement information for a link between the wireless communication device and the UE based on the first reference signal. The method further includes receiving, from the UE, a second reference signal in a