# US 11,910,437 B2 · Conflict avoidance in a cellular network

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- Number: US 11,910,437 B2
- Document ID: US11910437B2
- Status: Granted
- Kind: B2
- Application number: 17/280,906
- Filed: 2019-09-26
- Published: 2021-11-04
- Granted: 2024-02-20
- Earliest claimed: 2018-09-28
- Assignees: Jrd Communication (Shenzhen) Ltd.
- Applicants: Jrd Communication (Shenzhen) Ltd.
- Inventors: Sebastian Wagner
- Web page: https://patentgrep.com/patent/US11910437B2

## CPC

- H04W 74/0816: with collision avoidance
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Methods for managing transmission resource conflicts, particularly for cellular networks utilised unlicensed resources. Mobile devices may be configured using higher layer signalling to respond to RTS signals if the transmission resources are available.

## Claims

### Claim 1

A method for conflict avoidance in a cellular communication network, the method comprising the steps of:
transmitting a request-to-send/clear-to-send (RTS/CTS) configuration message from a base station of the cellular network to a mobile device served by the base station to cause the mobile device to activate an RTS/CTS process, wherein the RTS/CTS configuration message comprises a periodicity for transmission of the at least one CTS;
transmitting an RTS message from the base station to the mobile device requesting at least one CTS message from the mobile device, wherein the RTS message is a downlink control information (DCI) message, the DCI message is transmitted in a group-common control-resource set (CORESET) corresponding to the mobile device being addressed by the RTS message; and
receiving a CTS message at the base station from the mobile device in accordance with the RTS/CTS process;
wherein the RTS/CTS configuration message comprises an indication of a CTS signal to utilise;
the indicated CTS signal is UE-specific; and
the indication of a CTS signal indicates which shift or root of a Zadoff-Chu sequence to utilise.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the RTS/CTS configuration message is a higher-layer message.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the RTS/CTS configuration message is an RRC message.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the RTS/CTS configuration message comprises an indication of a mapping of the UE to a bit in a bitmap to be utilised in the RTS message.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the RTS/CTS configuration message comprises an indication of CTS repetitions.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the RTS/CTS configuration message comprises an indication of resources for transmission of at least one CTS message.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the RTS/CTS configuration message comprises information to enable the CTS message to be transmitted synchronously with other UEs.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the DCI message is encoded using a specific RNTI defined for RTS messages.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the RTS message comprises a bitmap field in which each bit corresponds to the requested RTS/CTS configuration of a predefined mobile device.

### Claim 10 (depends on 1)

The method according to claim 1, wherein the RTS message comprises at least one of a periodicity for transmission of the at least one CTS, an indication of CTS repetitions, an indication of resources for transmission of at least one CTS message.

### Claim 11 (depends on 1)

A base station configured to perform the method of claim 1, wherein the RTS/CTS configuration message is a higher-layer message.