# US 10,772,108 B2 · Coverage transition indicator for device-to-device communication

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- Number: US 10,772,108 B2
- Document ID: US10772108B2
- Status: Granted
- Kind: B2
- Application number: 15/861,341
- Filed: 2018-01-03
- Published: 2018-05-10
- Granted: 2020-09-08
- Earliest claimed: 2013-12-20
- Assignees: KYOCERA Corporation
- Applicants: Kyocera Corporation
- Inventors: Amit Kalhan; Henry Chang
- Web page: https://patentgrep.com/patent/US10772108B2

## CPC

- H04W 72/56: based on priority criteria
- H04L 67/104: Peer-to-peer [P2P] networks
- H04W 4/08: User group management
- H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC]
- H04W 24/08: Testing, {supervising or monitoring} using real traffic
- H04W 36/0061: {of neighbour cell information}
- H04W 36/305: {Handover due to radio link failure (control signalling for hand-off failure H04W36/0079)}
- H04W 48/14: using user query {or user detection}
- H04W 56/001: {Synchronization between nodes}
- H04W 56/0015: {one node acting as a reference for the others}
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04W 72/20: Control channels or signalling for resource management
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 72/51: based on terminal or device properties
- H04W 76/14: Direct-mode setup
- H04W 36/36: by user or terminal equipment
- H04W 72/1215: {for collaboration of different radio technologies}
- H04W 88/02: Terminal devices
- H04W 88/08: Access point devices
- 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

A User Equipment (UE) D2D device transmits a coverage transition indicator when the UE device leaves a service area of base station and is no longer in coverage. The coverage transition indicator at least indicates that the UE device has left the service area and is no longer in coverage. Based on the coverage transition indicator, a determination can be made as to whether the D2D group to which the UE device belongs has transitioned to an out of coverage scenario from a partial coverage scenario.

## Claims

### Claim 1

A method performed at a device-to-device user equipment (D2D UE), the method comprising:
selecting a system timing indicator to be included into a D2D synchronization signal (D2DSS) for synchronization of D2D communication, from among a first indicator and a second indicator,
wherein the first indicator indicates that the D2DSS is derived from a base station or derived from another D2D UE being in coverage of the base station, and
the second indicator indicates that the D2DSS is derived from another D2D UE being out of coverage of the base station;
transmitting the D2DSS including the selected system timing indicator;
determining whether the D2D UE is in coverage of the base station; and
transmitting a coverage indicator indicating whether the D2D UE is in coverage of the base station.

### Claim 2 (depends on 1)

The method according to claim 1, wherein
the selecting comprises selecting the system timing indicator from among the first indicator, the second indicator, and a third indicator, and
the third indicator indicates that the D2DSS is derived autonomously by the D2D UE.

### Claim 3

A device-to-device user equipment (D2D UE), comprising:
a controller configured to select a system timing indicator to be included into a D2D synchronization signal (D2DSS) for synchronization of D2D communication, from among a first indicator and a second indicator,
wherein the first indicator indicates that the D2DSS is derived from a base station or derived from another D2D UE being in coverage of the base station, and
the second indicator indicates that the D2DSS is derived from another D2D UE being out of coverage of the base station;
a transmitter configured to transmit the D2DSS including the selected system timing indicator;
the controller further configured to determine whether the D2D UE is in coverage of the base station; and
the transmitter further configured to transmit a coverage indicator indicating whether the D2D UE is in coverage of the base station.

### Claim 4 (depends on 3)

The D2D UE according to claim 3, wherein
the controller selects the system timing indicator from among the first indicator, the second indicator, and a third indicator, and
the third indicator indicates that the D2DSS is derived autonomously by the D2D UE.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the system timing indicator comprises a two bit flag.

### Claim 6 (depends on 3)

The D2D UE according to claim 3, wherein the system timing indicator comprises a two bit flag.