# US 2021/0345384 A1 · Latency Reduction for Network Scheduled Sidelink Resource Allocation

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- Number: US 2021/0345384 A1
- Document ID: US20210345384A1
- Status: Published application
- Kind: A1
- Application number: 17/279,912
- Filed: 2019-09-25
- Published: 2021-11-04
- Earliest claimed: 2018-09-27
- Assignees: Telefonaktiebolaget LM Ericsson (publ)
- Applicants: Telefonaktiebolaget LM Ericsson (PUBL)
- Inventors: Zhang Zhang; Marco Belleschi
- Web page: https://patentgrep.com/patent/US20210345384A1

## CPC

- H04W 72/12: Wireless traffic scheduling
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 74/08: Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method performed by a wireless device (110) includes determining that the wireless device has data to transmit in the sidelink, SL, buffer. A special scheduling request, SR, is transmitted using a SR resource to the network node to indicate that a SL resource allocation, SL RA, is needed. A grant is received from the network node for transmitting at least the data in the SL buffer. Based on the grant, at least the data in the SL buffer is transmitted.

## Claims

### Claim 1

A method performed by a wireless device, the method comprising:
determining that the wireless device has data to transmit in at least a sidelink, SL, buffer;
transmitting, using a scheduling request, SR, resource, a special scheduling request to a network node to indicate that a SL resource allocation, SL RA, is needed;
receiving, from the network node, a grant for transmitting at least the data in the SL buffer; and
based on the grant, transmitting at least the data in the SL buffer.

### Claim 2 (depends on 1)

The method of claim 1, wherein the SR resource comprises at least one dedicated SL resource, the at least one dedicated SL SR resource comprising a single dedicated SL SR resource on a physical uplink control channel, PUCCH, or a plurality of dedicated SL SR resources corresponding to one or more SL logical channels on the PUCCH.

### Claim 3 (depends on 2)

The method of claim 2, wherein the at least one dedicated SL SR resource comprises one or more bits in a bitmap of a multi-bit SR used for the SL, wherein each of the one or more bits is mapped to an associated one of one or more SL logical channels.

### Claim 4 (depends on 1)

The method of claim 1, further comprising determining that the wireless device has data in a Uu buffer to transmit, and wherein the special scheduling request indicates that the wireless device also has data in the Uu buffer to transmit.

### Claim 5 (depends on 4)

The method of claim 4, further comprising transmitting, based on the grant, the data in the Uu buffer.

### Claim at position 6

-10. (canceled)

### Claim 11

A method performed by a base station, the method comprising:
receiving, from a wireless device, a special scheduling request, SR, associated with a SR resource;
based on the SR resource, determining that the wireless device has data to transmit on either a sidelink, SL, or the SL and an uplink, UL;
transmitting, to the wireless device (110), a grant sufficient for transmitting the data on the SL or the SL and the UL.

### Claim at position 8

-32. (cancaled)

### Claim 33

A wireless device comprising:
processing circuitry configured to:
determine that the wireless device has data to transmit in at least a sidelink, SL, buffer;
transmit, using a scheduling request, SR, resource, a special scheduling request to a network node to indicate that a SL resource allocation, SL RA, is needed;
receive, from the network node, a grant for transmitting at least the data in the SL buffer; and
based on the grant, transmit at least the data in the SL buffer.

### Claim 34 (depends on 33)

The wireless device of claim 33, wherein the SR resource comprises at least one dedicated SL resource, the at least one dedicated SL SR resource comprising a single dedicated SL SR resource on a physical uplink control channel, PUCCH, or a plurality of dedicated SL SR resources corresponding to one or more SL logical channels on the PUCCH.

### Claim 35 (depends on 34)

The wireless device of claim 34, wherein the at least one dedicated SL SR resource comprises one or more bits in a bitmap of a multi-bit SR used for the SL, wherein each of the one or more bits is mapped to an associated one of one or more SL logical channels.

### Claim 36 (depends on 33)

The wireless device of claim 33, wherein the processing circuitry is configured to determine that the wireless device has data in a Uu buffer to transmit, and wherein the special scheduling request indicates that the wireless device also has data in the Uu buffer to transmit.

### Claim 37 (depends on 36)

The wireless device of claim 36, wherein the processing circuitry is configured to transmit, based on the grant, the data in the Uu buffer.

### Claim 38 (depends on 37)

The wireless device of claim 37, wherein the data that is transmitted includes a SL buffer status report, SL BSR, and a uplink buffer status report, Uu BSR.

### Claim 39 (depends on 33)

The wireless device of claim 33, wherein the processing circuitry is configured to:
determine that the data in the SL buffer is associated with a SL service requiring low latency; and
in response to determining that the data in the SL buffer is associated with a SL service requiring low latency and based on prioritization criteria, prioritize a SL buffer status report over at least one MAC control element.

### Claim 40 (depends on 39)

The wireless device of claim 39, wherein prioritizing the SL buffer status report comprises transmitting the buffer status report to a network node before the at least one MAC control element.

### Claim 41 (depends on 39)

The wireless device of claim 39, wherein the prioritization criteria indicates that SL buffer status report is prioritized in response to at least one of the following:
a packet of the data in the SL buffer has a priority higher than a threshold,
a highest priority packet of the data in the SL buffer has a priority higher than a threshold,
a highest priority packet in the SL buffer has a higher priority than a priority of a highest priority packet of data in a Uu buffer, and
a highest priority packet in a Uu buffer is lower than a threshold.

### Claim 42 (depends on 33)

The wireless device of claim 33, wherein the processing circuitry is configured to transmit a SL SR to a network node, the SL SR indicating that the data in the SL buffer is prioritized based on the prioritization criteria.

### Claim 43

A base station comprising:
processing circuitry configured to:
receive, from a wireless device, a special scheduling request (SR) associated with a SR resource;
based on the SR resource, determine that the wireless device has data to transmit on either a sidelink, SL, or the SL and an uplink, UL;
transmit, to the wireless device, a grant sufficient for transmitting the data on the SL or the SL and the UL.

### Claim 44 (depends on 43)

The base station of claim 43, wherein the SR resource comprises at least one dedicated SL resource, the at least one dedicated SL SR resource comprising a single dedicated SL SR resource on a physical uplink control channel, PUCCH, or a plurality of dedicated SL SR resources on the PUCCH.

### Claim 45 (depends on 44)

The base station of claim 44, wherein each of the plurality of dedicated SL SR resources corresponds to one or more SL logical channels.

### Claim 46 (depends on 44)

The base station of claim 44, wherein the at least one dedicated SL SR resource comprises one or more bits in a bitmap of a multi-bit SR used for the SL, wherein each of the one or more bits is mapped to an associated one of one or more SL logical channels.

### Claim 47 (depends on 43)

The base station of claim 43, wherein the processing circuitry is configured to determine, based on the SR resource, that the UE has data to transmit on the UL and the method further comprises receiving the data on the UL.

### Claim 48 (depends on 47)

The base station of claim 47, wherein the data received on the UL comprises an uplink buffer status report, Uu BSR.

### Claim 49 (depends on 43)

The base station of claim 43, wherein the processing circuitry is configured to:
transmit, to a wireless device (110), prioritization criteria for prioritizing a SL buffer status report associated with a SL service requiring low latency over at least one MAC control element; and
based on the prioritization criteria, receive the SL buffer status report that is prioritized over the at least one MAC control element.

### Claim 50 (depends on 49)

The base station of claim 49, wherein the buffer status report is received before the MAC control element.

### Claim 51 (depends on 49)

The base station of claim 49, wherein the prioritization criteria indicates that SL buffer status report is prioritized in response to one of the following:
a packet of the data in the SL buffer has a priority higher than a threshold,
a highest priority packet of the data in the SL buffer has a priority higher than a threshold,
a highest priority packet in the SL buffer has a higher priority than a priority of a highest priority packet of data in a Uu buffer,
a highest priority packet in a Uu buffer is lower than a threshold, and
a previously transmitted SR was transmitted on a SL SR resource.

### Claim 52 (depends on 49)

The base station of claim 49, further comprising receiving, from the wireless device, a SL SR indicating that the data in the SL buffer is prioritized based on the prioritization criteria.

### Claim at position 29

-64. (canceled)