# US 2022/0279482 A1 · Prioritized discovery for high spectral efficiency nr sidelink

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- Number: US 2022/0279482 A1
- Document ID: US20220279482A1
- Status: Published application
- Kind: A1
- Application number: 17/187,316
- Filed: 2021-02-26
- Published: 2022-09-01
- Earliest claimed: 2021-02-26
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Yisheng XUE; Jing SUN; Xiaoxia ZHANG; Chih-Hao LIU; Aleksandar DAMNJANOVIC
- Web page: https://patentgrep.com/patent/US20220279482A1

## CPC

- H04W 72/02: Selection of wireless resources by user or terminal
- H04W 72/20: Control channels or signalling for resource management
- H04L 1/1614: {using bitmaps}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 76/11: Allocation or use of connection identifiers
- H04W 8/005: {Discovery of network devices, e.g. terminals}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Certain aspects of the present disclosure provide a user equipment (UE) that may receive an indication of a proximity discovery resource in a physical sidelink feedback channel (PSFCH) symbol from a network entity. The UE may transmit a proximity discovery request including the indication of the proximity discovery resource. The UE may receive a PSFCH sequence associated with the proximity discovery resource from other UEs that may respond to the proximity discovery request. The UE may transmit a bit map sequence indicative of the other UEs to the network entity. The network entity may determine a proximity between the UE and the other UEs based on the bit map sequence. The network entity may schedule the UE and the other UEs based on the proximity.

## Claims

### Claim 1

A method for wireless communications by a user equipment (UE), comprising:
receiving, from a network entity, an indication of a proximity discovery resource in a physical sidelink feedback channel (PSFCH) symbol;
transmitting a proximity discovery request comprising the indication of the proximity discovery resource;
receiving, from one or more other UEs, a PSFCH sequence associated with the proximity discovery resource; and
transmitting, to the network entity, a bit map sequence indicative of the one or more other UEs.

### Claim 2 (depends on 1)

The method of claim 1, wherein the indication is received via a downlink control information (DCI), and wherein the DCI grants the proximity discovery resource comprising physical resource blocks (PRBs) in the PSFCH symbol.

### Claim 3 (depends on 2)

The method of claim 2, wherein:
the DCI comprises at least one of: an identification (ID) or a reference signal received power (RSRP) threshold; and
the proximity discovery request is transmitted via a sidelink control information (SCI) comprising the proximity discovery request, wherein the SCI further comprises at least one of: the ID or the RSRP threshold.

### Claim 4 (depends on 2)

The method of claim 2, wherein the PSFCH sequence is received from the one or more UEs over a corresponding PSFCH resource block.

### Claim 5 (depends on 4)

The method of claim 4, wherein the DCI comprises at least one of: an identification (ID) or a reference signal received power (RSRP) threshold and the method further comprising:
after receiving the PSFCH sequence, determining an energy level on the corresponding PSFCH resource block;
when the energy level is within a range corresponding to the RSRP threshold, validating the PSFCH sequence in the proximity discovery resource; and
when the energy level is not within the range corresponding to the RSRP threshold, setting a bit to a particular value in the bit map sequence.

### Claim 6 (depends on 3)

The method of claim 3, wherein the DCI further comprises a specified random seed, and wherein the SCI further comprises the specified random seed to be used by the one or more other UEs for computing an index in the proximity discovery resource.

### Claim 7 (depends on 3)

The method of claim 3, wherein the RSRP threshold indicates at least one of: an RSRP threshold value or an RSRP threshold range.

### Claim 8 (depends on 2)

The method of claim 2, wherein the DCI comprises a physical uplink shared channel (PUSCH) resource for carrying a media access control (MAC)—control element (CE), and wherein the bit map sequence it transmitted to the network entity via the MAC-CE.

### Claim 9 (depends on 2)

The method of claim 2, wherein the DCI comprises a transmit precoding configuration and the method further comprising:
using the transmit precoding configuration to transmit the proximity discovery request.

### Claim 10

A method for wireless communications by a first user equipment (UE), comprising:
receiving, from a second UE, a proximity discovery request comprising an indication of a proximity discovery resource in a physical sidelink feedback channel (PSFCH) symbol; and
transmitting, to the second UE, a PSFCH sequence associated with the proximity discovery resource.

### Claim 11 (depends on 10)

The method of claim 10, wherein the reception comprises:
receiving a sidelink control information (SCI) comprising the proximity discovery request, wherein the SCI further comprises at least one of: an identification (ID) or a reference signal received power (RSRP) threshold.

### Claim 12 (depends on 11)

The method of claim 11, wherein the PSFCH sequence is transmitted to the second UE if the SCI was transmitted by the second UE using a valid sidelink radio network temporary identifier (SL-RNTI).

### Claim 13 (depends on 12)

The method of claim 12, further comprising:
determining an RSRP from a demodulation reference signal (DMRS) of the second UE; and
when the RSRP is equal to or more the RSRP threshold, computing an index in the proximity discovery resource using a hashed value of the SL-RNTI, wherein the PSFCH sequence indicates the index in the proximity discovery resource.

### Claim 14 (depends on 12)

The method of claim 12, wherein the ID is a physical cell ID (PCI), and wherein the SL-RNTI is valid when the first UE has the SL-RNTI assigned by a network entity with the same PCI.

### Claim 15 (depends on 12)

The method of claim 12, wherein the ID is an operator ID, and wherein the SL-RNTI is valid when the first UE and a network entity are associated with the same operator ID.

### Claim 16 (depends on 12)

The method of claim 12, further comprising:
obtaining a set via a system information block (SIB) or a radio resource control (RRC); and
determining whether the ID is in the set, and wherein the SL-RNTI is valid when the ID is within the set.

### Claim 17

A method for wireless communications by a network entity, comprising:
transmitting, to a user equipment (UE), an indication of a proximity discovery resource in a physical sidelink feedback channel (PSFCH) symbol causing the UE to transmit a proximity discovery request comprising the indication of the proximity discovery resource; and
receiving, from the UE, a bit map sequence indicative of one or more other UEs that had responded to the proximity discovery request.

### Claim 18 (depends on 17)

The method of claim 17, further comprising:
determining a proximity between the UE and the one or more other UEs based on the bit map sequence; and
scheduling the UE and the one or more other UEs based on the proximity.

### Claim 19 (depends on 17)

The method of claim 17, wherein the transmission comprises:
transmitting, to the UE, a downlink control information (DCI), wherein the DCI grants the proximity discovery resource comprising physical resource blocks (PRBs) in the PSFCH symbol, and wherein the DCI comprises at least one of: an identification (ID) or a reference signal received power (RSRP) threshold.

### Claim 20 (depends on 19)

The method of claim 19, wherein the proximity discovery request is transmitted via a sidelink control information (SCI), and wherein the SCI further comprises at least one of: the ID or the RSRP threshold.

### Claim 21 (depends on 19)

The method of claim 19, further comprising:
collecting all PRBs that are not used by hybrid automatic repeat request (HARQ) responses in the PSFCH symbol in a static discovery resource pool; and
defining proximity discovery indices (PDIs) for respective proximity discovery resources in the static discovery resource pool.

### Claim 22 (depends on 17)

The method of claim 17, further comprising:
dynamically defining the proximity discovery resource in the PSFCH symbol to include a sequence opportunity for hybrid automatic repeat request (HARQ) responses.

### Claim 23 (depends on 20)

The method of claim 20, further comprising:
transmitting, to the one or more other UEs, a hash function comprising a random seed to be used by the one or more other UEs to compute an index in the proximity discovery resource when there is no specified random seed within the SCI.

### Claim 24 (depends on 20)

The method of claim 20, further comprising:
assigning two or more hash functions to the one or more other UEs.

### Claim 25 (depends on 24)

The method of claim 24, further comprising:
determining a number of hash functions assigned to the one or more other UEs, wherein the DCI further comprises the determined number of hash functions.

### Claim 26 (depends on 25)

The method of claim 25, wherein the SCI further comprises the indication of the determined number of hash functions, the determined number being used by the one or more other UEs to invoke corresponding hash functions and transmit PSHCH sequences to the UE.