Sidelink communications

Patent metadata

Field	Value
Publication number	US-12356432-B2
Application number	US-202017754718-A
Country	US
Kind code	B2
Filing date	Sep 24, 2020
Priority date	Oct 9, 2019
Publication date	Jul 8, 2025
Grant date	Jul 8, 2025

Abstract

Methods for transmitting CSI and/or position information between nodes in a network. In particular processes and systems for sidelink groupcast transmissions in a cellular network.

First claim

The invention claimed is:

1. A method of determining channel state information in a groupcast system, the method comprising the steps of
transmitting a signal including a CSI-RS from a first UE which is a member of a group of UEs to all other UEs of the group as a groupcast message; and
transmitting a signal including channel state information from each UE of the group receiving the CSI-RS to the first UE;
wherein the CSI-RS is transmitted with a sidelink control information (SCI), and a UE location is conveyed in the SCI;
wherein the UE location is transmitted using a defined coordinate system or by mapping to a predefined set of locations with Zone IDs;
in a case where CSI reports are sent by a unicast transmission, the UE location is reported as a payload in the CSI reports;
wherein each CSI report groupcast transmission is transmitted on a physical sidelink shared channel (PSSCH), and each groupcast transmission enables all UEs to obtain CSI for all links from each transmitting UE to all receiving UEs;
wherein a groupcast CSI reporting process is iteratively performed by each UE in the group, each UE sequentially transmits a CSI-RS in a groupcast transmission, and all UEs subsequently transmit corresponding CSI reports in groupcast format;
wherein each transmission comprises both the CSI-RS and previously received CSI reports as data, receiving a groupcast PSSCH transmission allows both CSI measurement and sharing; and
wherein an order of transmission is preconfigured or determined through resource monitoring, and each CSI report comprises a new or updated CSI data or a differential with respect to a prior CSI report.

2. A method according to claim 1 , wherein transmission resources for the CSI-RS and/or channel state information are allocated by a base station.

3. A method according to claim 2 , wherein an indication of the allocated resources is transmitted from the base station to the first UE, and the signal including the CSI-RS transmitted by the first UE includes an indication of the allocated resources for transmission of the channel state information.

4. A method according to claim 2 , wherein an indication of the allocated resources is transmitted from the base station to each UE of the group.

5. A method according to claim 1 , further comprising the step of transmitting the channel state information from the first UE to the base station.

6. A method according to claim 1 , wherein the method is initiated by a request from the first UE to the base station.

7. A method according to claim 1 , wherein the method is initiated by the base station.

8. A method according to claim 1 , wherein the transmission resources for the CSI-RS and/or channel state information are selected by the first UE.

9. A method according to claim 1 , wherein the channel state information is transmitted by each UE as a unicast message to the first UE.

10. A method according to claim 1 , wherein the channel state information is transmitted by each UE as a groupcast message to all other UEs of the group including the first UE.

11. A method according to claim 10 , further comprising
a second UE of the group transmitting a signal including a CSI-RS to all other UEs of the group; and
all UEs of the group other than the second UE transmitting channel state information in a groupcast message to all other UEs of the group.

12. A method according to claim 1 , wherein the signal including channel state information also includes an indication of a location of the UE transmitting the signal including channel state information.

13. A method according to claim 12 , wherein UEs receiving the location information utilise that information for directional transmissions to the relevant UE.

14. A method according to claim 12 , wherein the first UE transmits the location information to the base station.

15. A method of determining channel state information in a groupcast system, the method comprising the steps of
transmitting a message to each UE of a group instructing each UE to report channel state information to the base station in response to a CSI-RS to be received from a first UE of the group;
in response to the message the first UE transmitting a CSI-RS to the other UEs of the group; and
each UE receiving the CSI-RS and transmitting channel state information to the base station;
wherein the CSI-RS is transmitted with a sidelink control information (SCI), and a UE location is conveyed in the SCI;
wherein the UE location is transmitted using a defined coordinate system or by mapping to a predefined set of locations with Zone IDs;
in a case where CSI reports are sent by a unicast transmission, the UE location is reported as a payload in the CSI reports;
wherein each CSI report groupcast transmission is transmitted on a physical sidelink shared channel (PSSCH), and each groupcast transmission enables all UEs to obtain CSI for all links from each transmitting UE to all receiving UEs;
wherein a groupcast CSI reporting process is iteratively performed by each UE in the group, each UE sequentially transmits a CSI-RS in a groupcast transmission, and all UEs subsequently transmit corresponding CSI reports in groupcast format;
wherein each transmission comprises both the CSI-RS and previously received CSI reports as data, receiving a groupcast PSSCH transmission allows both CSI measurement and sharing; and
wherein an order of transmission is preconfigured or determined through resource monitoring, and each CSI report comprises a new or updated CSI data or a differential with respect to a prior CSI report.

16. A method of sharing location information between UEs, the method comprising
transmitting a sidelink control information (SCI) message from a first UE of a group of UEs to at least one other UE of the group, wherein the SCI includes the first UE's location, and
utilising the location for user grouping, relaying/cooperation management, group leader selection, and/or power control; wherein the first UE's location is transmitted using a defined coordinate system or by mapping to a predefined set of locations with Zone IDs;
in a case where CSI reports are sent by a unicast transmission, the UE location is reported as a payload in the CSI reports;
wherein each CSI report groupcast transmission is transmitted on a physical sidelink shared channel (PSSCH), and each groupcast transmission enables all UEs to obtain CSI for all links from each transmitting UE to all receiving UEs;
wherein a groupcast CSI reporting process is iteratively performed by each UE in the group, each UE sequentially transmits a CSI-RS in a groupcast transmission, and all UEs subsequently transmit corresponding CSI reports in groupcast format;
wherein each transmission comprises both the CSI-RS and previously received CSI reports as data, receiving a groupcast PSSCH transmission allows both CSI measurement and sharing; and
wherein an order of transmission is preconfigured or determined through resource monitoring, and each CSI report comprises a new or updated CSI data or a differential with respect to a prior CSI report.

Assignees

• Jrd Communication Shenzhen Ltd

Inventors

• Garcia Virgile
• Salim Umer

Classifications

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04W72/30

  Resource management for broadcast services · CPC title

• H04L5/005

  of common pilots, i.e. pilots destined for multiple users or terminals · CPC title

• H04L5/0057

  Physical resource allocation for CQI · CPC title

• H04L1/0026

  Transmission of channel quality indication · CPC title