# US 2018/0324882 A1 · Relaying in a device-to-device communication system

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- Number: US 2018/0324882 A1
- Document ID: US20180324882A1
- Status: Published application
- Kind: A1
- Application number: 15/960,155
- Filed: 2018-04-23
- Published: 2018-11-08
- Earliest claimed: 2017-05-05
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Kapil GULATI; Sudhir Kumar BAGHEL; Zhibin WU
- Web page: https://patentgrep.com/patent/US20180324882A1

## CPC

- H04W 76/14: Direct-mode setup
- H04B 7/15542: {Selecting at relay station its transmit and receive resources (selection of wireless resources by user or terminal H04W72/02; arrangements affording multiple use of the transmission path by two-dimensional division of the resources H04L5/0003, or by allocating sub-channels H04L5/003)}
- H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH}
- H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC]
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04L 27/0006: {Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio (for spectrum sharing between different networks H04W16/14)}
- H04W 8/26: Network addressing or numbering for mobility support
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 88/04: adapted for relaying to or from another terminal or user
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

The present aspects relate to device-to-device (D2D) relaying in a wireless communication system. In an aspect, a relay user equipment (UE) may receive, on a downlink channel from a network entity, at least one indication including resource allocation information for at least one of the relay UE or a remote UE. The relay UE may further transmit, on a sidelink channel to the remote UE, the resource allocation information of the remote UE. In another aspect, a remote UE may receive, on at least one sidelink channel, resource allocation information from a relay UE, the resource allocation information indicating one or more resources allocated for sidelink communication for the remote UE. The remote UE may further transmit, on one or more sidelink channels, data to the relay UE in accordance with the one or more resources allocated for sidelink communication.

## Claims

### Claim 1

A method of wireless communication at a relay user equipment (UE), comprising:
receiving, on a downlink channel from a network entity, at least one indication including resource allocation information for at least one of the relay UE or a remote UE; and
transmitting, on a sidelink channel to the remote UE, the resource allocation information of the remote UE.

### Claim 2 (depends on 1)

The method of claim 1, wherein the resource allocation information corresponds to downlink control information (DCI) including a resource allocation for at least one of the relay UE or the remote UE at a first time value representing a subframe slot plus a first time variable associated with the resource allocation.

### Claim 3 (depends on 2)

The method of claim 2, wherein the first time variable corresponds at least one of a fixed value or a radio resource control (RRC) configured value.

### Claim 4 (depends on 2)

The method of claim 2, wherein the DCI is scrambled with at least a cell radio network temporary identifier (C-RNTI) of the relay UE or an RNTI of the remote UE.

### Claim 5 (depends on 2)

The method of claim 2, wherein the DCI is transmitted via an enhanced physical downlink control channel (E-PDCCH).

### Claim 6 (depends on 2)

The method of claim 2, wherein transmitting the resource allocation information to the remote UE includes:
transmitting the DCI as sidelink control information (SCI) without associated data to the remote UE, or
transmitting DCI as a medium access control (MAC) control element (CE) as part of the sidelink shared channel (SL-SCH) data.

### Claim 7 (depends on 6)

The method of claim 6, wherein the DCI is transmitted at a second time value representing the subframe slot plus a second time variable less than the first time variable.

### Claim 8 (depends on 7)

The method of claim 7, further comprising determining the second time variable such that the first time value plus the first time variable is equal to the second time value plus the second time variable.

### Claim 9 (depends on 1)

The method of claim 1, wherein the resource allocation information includes a bulk allocation of resources for one or more remote UEs including the remote UE and associated with a semi-persistent scheduling (SPS) configuration.

### Claim 10 (depends on 9)

The method of claim 9, wherein transmitting the resource allocation information to the remote UE includes allocating, for at least the remote UE, a single resource from the resources at a distinct time.

### Claim 11 (depends on 9)

The method of claim 9, wherein the indication further includes a periodicity indication associated with an SPS-RNTI, the periodicity indication representing a repetition period for the bulk allocation of resources, and
wherein transmitting the resource allocation information to the remote UE includes:
transmitting DCI as sidelink control information (SCI) without associated data to the remote UE, or
transmitting DCI as a medium access control (MAC) control element (CE) as part of the sidelink shared channel (SL-SCH) data.

### Claim 12 (depends on 1)

The method of claim 1, further comprising:
determining a first timing advance information; and
transmitting the first timing advance information to the remote UE.

### Claim 13 (depends on 12)

The method of claim 12, wherein determining the first timing advance information includes:
receiving, from a network entity, a second timing advance information for use in transmissions between the relay UE and the network entity; and
setting the first timing advance information equal to the second timing advance information.

### Claim 14 (depends on 12)

The method of claim 12, wherein determining the first timing advance information includes:
receiving, from a network entity, a second timing advance information for use in transmissions between the relay UE and the network entity;
determining a timing offset based on a received timing of one or more sidelink channels; and
setting the first timing advance information as a function of the second timing advance information and the timing offset.

### Claim 15 (depends on 14)

The method of claim 14, further comprising:
determining whether the timing offset is within at least one of a minimum limit or maximum limit; and
adjusting the timing offset to at least one of the minimum limit or the maximum limit.

### Claim 16 (depends on 15)

The method of claim 15, wherein at least one of the minimum limit or maximum limit is within a fixed autonomous timing correction limit allowed by the network entity.

### Claim 17 (depends on 15)

The method of claim 15, wherein at least one of the minimum limit or maximum limit is received as an RRC configuration from a network entity.

### Claim 18 (depends on 12)

The method of claim 12, further comprising transmitting one or more sidelink synchronization signals to the remote UE utilizing timing that corresponds to the first timing advance information.

### Claim 19

A method of wireless communication at a remote user equipment (UE), comprising:
receiving, on at least one sidelink channel, resource allocation information from a relay UE, the resource allocation information indicating one or more resources allocated for sidelink communication for the remote UE; and
transmitting, on one or more sidelink channels, data to the relay UE in accordance with the one or more resources allocated for sidelink communication.

### Claim 20 (depends on 19)

The method of claim 19, further comprising receiving, on the at least one sidelink channel, timing information from the relay UE,
wherein transmitting the data to the relay includes transmitting in accordance with the timing information.

### Claim 21 (depends on 20)

The method of claim 20, wherein receiving the timing information includes receiving at least one of timing advance information of the relay UE or timing advance information of the remote UE.

### Claim 22 (depends on 19)

The method of claim 19, wherein receiving the timing information includes:
detecting a sidelink synchronization signal transmitted by the relay UE; and
determining timing advance information based on the sidelink synchronization signal.

### Claim 23 (depends on 19)

The method of claim 19, wherein the resource allocation information corresponds to at least one of one or more resources allocated by a network entity or the relay UE.

### Claim 24

A relay user equipment (UE) for wireless communication, comprising:
a memory; and
a processor in communication with the memory, wherein the processor is configured to:
receive, on a downlink channel from a network entity, at least one indication including resource allocation information for at least one of the relay UE or a remote UE; and
transmit, on a sidelink channel to the remote UE, the resource allocation information of the remote UE.

### Claim 25 (depends on 24)

The relay UE of claim 24, wherein the resource allocation information corresponds to downlink control information (DCI) including a resource allocation for at least one of the relay UE or the remote UE at a first time value representing a subframe slot plus a first time variable associated with the resource allocation.

### Claim 26 (depends on 24)

The relay UE of claim 24, wherein the resource allocation information includes a bulk allocation of resources for one or more remote UEs including the remote UE and associated with a semi-persistent scheduling (SPS) configuration.

### Claim 27 (depends on 24)

The relay UE of claim 24, wherein the processor is further configured to:
determine a first timing advance information; and
transmit the first timing advance information to the remote UE.

### Claim 28

A remote user equipment (UE) for wireless communication, comprising:
a memory; and
a processor in communication with the memory, wherein the processor is configured to:
receive, on at least one sidelink channel, resource allocation information from a relay UE, the resource allocation information indicating one or more resources allocated for sidelink communication for the remote UE; and
transmit, on one or more sidelink channels, data to the relay UE in accordance with the one or more resources allocated for sidelink communication.

### Claim 29 (depends on 19)

The remote UE of claim 19, wherein the processor is further configured to receive, on the at least one sidelink channel, timing information from the relay UE,
wherein to transmit the data to the relay, the processor is further configured to transmit in accordance with the timing information.

### Claim 30 (depends on 20)

The remote UE of claim 20, wherein to receive the timing information, the processor is further configured to receive at least one of timing advance information of the relay UE or timing advance information of the remote UE.