Coverage transition indicator for device-to-device communication
AssigneeKYOCERA Corporation
InventorsAmit Kalhan, Henry Chang
Life of this patent
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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.
Claims6
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.
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.
Dependencies are inferred from the claim text.