# US 2023/0054548 A1 · Sidelink discovery message forwarding

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- Number: US 2023/0054548 A1
- Document ID: US20230054548A1
- Status: Published application
- Kind: A1
- Application number: 17/405,774
- Filed: 2021-08-18
- Published: 2023-02-23
- Earliest claimed: 2021-08-18
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Kaidong Wang; Jelena Damnjanovic; Tao Luo
- Web page: https://patentgrep.com/patent/US20230054548A1

## CPC

- H04W 8/005: {Discovery of network devices, e.g. terminals}
- H04B 7/06952: {Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping}
- H04W 72/20: Control channels or signalling for resource management
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION

## Abstract

This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for sidelink discovery message forwarding. In some implementations, a first user equipment (UE) may receive a discovery message from a second UE. The discovery message may be part of a beam training procedure between the first UE and the second UE. The first UE may forward the discovery message to one or more other UEs based on a condition associated with one or more forwarding termination parameters being satisfied. The first UE may, in some implementations, select one of a broadcast transmission or a unicast transmission for forwarding the discovery message based on one or more parameters associated with the UE. The first UE may transmit the discovery message from the second UE to the one or more other UEs using the selected broadcast or unicast transmission when the condition is satisfied.

## Claims

### Claim 1

An apparatus for wireless communications, comprising:
a processing system;
a first interface configured to:
obtain for a first user equipment (UE) and from a second UE, a discovery message of a beam training procedure between the first UE and the second UE; and
the first interface or a second interface configured to:
output the discovery message from the second UE to one or more other UEs when a condition associated with one or more forwarding termination parameters is satisfied.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein:
the processing system is further configured to:
select one of a broadcast transmission or a unicast transmission for transmitting the discovery message based at least in part on one or more parameters associated with the first UE; and
the first interface or the second interface is further configured to:
output the discovery message to the one or more other UEs as at least a part of the selected one of the broadcast transmission or the unicast transmission.

### Claim 3 (depends on 2)

The apparatus of claim 2, wherein the one or more parameters associated with the first UE comprise a type of connection supported by the first UE, an indication of the one of the broadcast transmission or the unicast transmission obtained via the discovery message, a configuration for the first UE, a status of a network that includes the first UE, or any combination thereof.

### Claim 4 (depends on 1)

The apparatus of claim 1, wherein the condition being satisfied corresponds to an absence of an early termination message, a discovery response message, or both, within a termination window.

### Claim 5 (depends on 1)

The apparatus of claim 1, wherein:
the first interface is further configured to:
obtain a second discovery message; and
the processing system is further configured to:
refrain from forwarding the second discovery message based at least in part on the condition being unsatisfied.

### Claim 6 (depends on 5)

The apparatus of claim 5, wherein the first interface is further configured to:
obtain an early termination message or a discovery response message within a termination window, wherein the condition being unsatisfied corresponds to receiving the early termination message or the discovery response message.

### Claim 7 (depends on 1)

The apparatus of claim 1, wherein the discovery message indicates discovery information comprising a set of time and frequency resources for the beam training procedure, a location of the second UE, mobility information associated with the second UE, system information, information associated with a serving base station (BS), a beam sweeping pattern for the beam training procedure, or any combination thereof.

### Claim 8 (depends on 7)

The apparatus of claim 7, wherein:
the first interface is further configured to:
obtain the discovery message at a physical layer of the first UE; and
the first interface or the second interface is further configured to:
output, from the physical layer of the first UE, a discovery response message to the second UE, wherein the discovery response message is based at least in part on the discovery information, and wherein the discovery information is identified at a medium access control (MAC) layer of the first UE.

### Claim 9 (depends on 7)

The apparatus of claim 7, wherein the first interface is further configured to:
obtain, from the second UE via a physical sidelink shared channel (PSSCH), a sidelink control information (SCI) message comprising the discovery information.

### Claim 10 (depends on 1)

The apparatus of claim 1, wherein:
the processing system is further configured to:
generate a discovery response message by one or both of an application layer of the first UE or a physical layer of the first UE; and
the first interface or the second interface is further configured to:
output, to the second UE, the discovery response message based at least in part on receiving the discovery message, wherein the discovery response message indicates a location of the first UE, a number of beams supported by the first UE, a reference signal received power (RSRP) of a demodulation reference signal (DMRS) of the discovery message, or any combination thereof.

### Claim 11 (depends on 1)

The apparatus of claim 1, wherein the first interface is further configured to:
obtain, from a base station (BS), one or more beam management parameters associated with the beam training procedure.

### Claim 12 (depends on 11)

The apparatus of claim 11, wherein, to obtain the one or more beam management parameters, the first interface is further configured to:
obtain, from the BS and via Layer 1 or Layer 3 signaling, control signaling identifying a configuration for the beam training procedure; and
obtain, from the BS and via Layer 2 signaling, an indication of a set of options associated with the one or more beam management parameters.

### Claim 13

An apparatus for wireless communication at a third user equipment (UE), comprising:
a processing system;
a first interface configured to:
obtain, from a first UE, a discovery message of a beam training procedure between the first UE and a second UE, wherein the discovery message is associated with one or more forwarding termination parameters being satisfied; and
the first interface or a second interface configured to:
output, to at least the first UE, the second UE, or both, a discovery response message based at least in part on the discovery message.

### Claim 14 (depends on 13)

The apparatus of claim 13, wherein, to obtain the discovery message, the first interface is further configured to:
obtain the discovery message via one of a broadcast transmission or a unicast transmission.

### Claim 15 (depends on 13)

The apparatus of claim 13, wherein the first interface or the second interface is further configured to:
output, to at least the first UE, the second UE, or both via a broadcast transmission or a unicast transmission, an early termination message based at least in part on receiving the discovery message.

### Claim 16 (depends on 13)

The apparatus of claim 13, wherein the discovery message indicates discovery information comprising a set of time and frequency resources for the beam training procedure, a location of the second UE, mobility information associated with the second UE, system information, information associated with a serving base station (BS), a beam sweeping pattern for the beam training procedure, or any combination thereof.

### Claim 17 (depends on 16)

The apparatus of claim 16, wherein, to output the discovery response message, the first interface or the second interface is further configured to:
obtain the discovery message at a physical layer of the third UE; and
output, from the physical layer of the third UE, the discovery response message, wherein the discovery response message is based at least in part on second discovery information identified at a medium access control (MAC) layer of the third UE.

### Claim 18 (depends on 16)

The apparatus of claim 16, wherein the first interface is further configured to:
obtain, from the first UE via a physical sidelink shared channel (PSSCH), a sidelink control information (SCI) message comprising the discovery information.

### Claim 19 (depends on 13)

The apparatus of claim 13, wherein the processing system is further configured to:
generate the discovery response message by one or both of an application layer of the third UE or a physical layer of the third UE, the discovery response message indicating a location of the third UE, a number of beams supported by the third UE, a reference signal received power (RSRP) of a demodulation reference signal (DMRS) of the discovery message, or any combination thereof.

### Claim 20 (depends on 13)

The apparatus of claim 13, wherein the first interface is further configured to:
obtain, from a base station (BS), one or more beam management parameters associated with the beam training procedure.

### Claim 21

(canceled)

### Claim 22

A method for wireless communication at a first user equipment (UE), comprising:
receiving, from a second UE, a discovery message of a beam training procedure between the first UE and the second UE; and
transmitting the discovery message from the second UE to one or more other UEs when a condition associated with one or more forwarding termination parameters is satisfied.

### Claim 23 (depends on 22)

The method of claim 22, further comprising:
selecting one of a broadcast transmission or a unicast transmission for transmitting the discovery message based at least in part on one or more parameters associated with the first UE; and
transmitting the discovery message to the one or more other UEs as at least a part of the selected one of the broadcast transmission or the unicast transmission.

### Claim 24 (depends on 23)

The method of claim 23, wherein the one or more parameters associated with the first UE comprise a type of connection supported by the first UE, an indication of the one of the broadcast transmission or the unicast transmission received via the discovery message, a configuration for the first UE, a status of a network that includes the first UE, or any combination thereof.

### Claim 25 (depends on 22)

The method of claim 22, wherein the condition being satisfied corresponds to an absence of an early termination message, a discovery response message, or both, within a termination window.

### Claim 26

(canceled)

### Claim 27

(canceled)

### Claim 28 (depends on 22)

The method of claim 22, wherein the discovery message indicates discovery information comprising a set of time and frequency resources for the beam training procedure, a location of the second UE, mobility information associated with the second UE, system information, information associated with a serving base station (BS), a beam sweeping pattern for the beam training procedure, or any combination thereof.

### Claim 29 (depends on 28)

The method of claim 28, further comprising:
receiving the discovery message at a physical layer of the first UE; and
transmitting, from the physical layer of the first UE, a discovery response message to the second UE, wherein the discovery response message is based at least in part on the discovery information, and wherein the discovery information is identified at a medium access control (MAC) layer of the first UE.

### Claim 30 (depends on 28)

The method of claim 28, further comprising:
receiving, from the second UE via a physical sidelink shared channel (PSSCH), a sidelink control information (SCI) message comprising the discovery information.

### Claim at position 31

31-33. (canceled)

### Claim 34

A method for wireless communication at a third user equipment (UE), comprising:
receiving, from a first UE, a discovery message of a beam training procedure between the first UE and a second UE, wherein the discovery message is associated with one or more forwarding termination parameters being satisfied; and
transmitting, to at least the first UE, the second UE, or both, a discovery response message based at least in part on the discovery message.

### Claim 35 (depends on 34)

The method of claim 34, wherein receiving the discovery message comprises:
receiving the discovery message via one of a broadcast transmission or a unicast transmission.

### Claim 36 (depends on 34)

The method of claim 34, further comprising:
transmitting, to at least the first UE, the second UE, or both via a broadcast transmission or a unicast transmission, an early termination message based at least in part on receiving the discovery message.

### Claim at position 35

37-42. (canceled)