COVERAGE TRANSITION INDICATOR FOR DEVICE-TO-DEVICE COMMUNICATION
First Claim
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1. A method performed at a user equipment (UE) device, the method comprising:
- communicating within a device-to-device (D2D) group including at least the UE device and a second D2D UE device;
receiving a coverage transition indicator (CTI) from the second D2D UE device, the CTI indicating that the second UE device has left a base station service area and is no longer within coverage;
determining that the D2D group is in a partial coverage scenario when a system-derived D2D timing information has been received within a maximum time period, the system-derived D2D timing information transmitted by a third UE device of the D2D group and derived from system timing received at the third UE device from a base station connected to a system network, the partial coverage scenario occurring when at least one UE device of the D2D group is within coverage; and
determining that the D2D group is in an out of coverage scenario when no system-derived D2D timing information is received within the maximum time period from any UE device of the group, the out of coverage scenario occurring when all UE devices of the D2D group are out of coverage.
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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.
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Citations
20 Claims
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1. A method performed at a user equipment (UE) device, the method comprising:
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communicating within a device-to-device (D2D) group including at least the UE device and a second D2D UE device; receiving a coverage transition indicator (CTI) from the second D2D UE device, the CTI indicating that the second UE device has left a base station service area and is no longer within coverage; determining that the D2D group is in a partial coverage scenario when a system-derived D2D timing information has been received within a maximum time period, the system-derived D2D timing information transmitted by a third UE device of the D2D group and derived from system timing received at the third UE device from a base station connected to a system network, the partial coverage scenario occurring when at least one UE device of the D2D group is within coverage; and determining that the D2D group is in an out of coverage scenario when no system-derived D2D timing information is received within the maximum time period from any UE device of the group, the out of coverage scenario occurring when all UE devices of the D2D group are out of coverage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method performed at a user equipment (UE) device, the method comprising:
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communicating within a device-to-device (D2D) group in accordance with at least one revision of The Third-Generation Partnership Project Long-Term Evolution (3GPP LTE) communication specification, the D2D group including at least the UE device and a second D2D UE device; receiving a coverage transition indicator (CTI) from the second D2D UE device, the CTI indicating that the second UE device has left a base station service area and is no longer within coverage, the CTI transmitted within a one bit field within a PD2DSCH of a first D2DSS signal transmitted by the second UE device; determining that the D2D group is in a partial coverage scenario when a second D2DSS signal has been received within a maximum time period, the D2DSS signal transmitted by a third UE device of the D2D group and derived from PSS/SSS received at the third UE device from a base station connected to a system network, the partial coverage scenario occurring when at least one UE device of the D2D group is within coverage; and determining that the D2D group is in an out of coverage scenario when no D2DSS is received from any UE device of the D2D group within the maximum time period, the out of coverage scenario occurring when all UE devices of the D2D group are out of coverage. - View Dependent Claims (11)
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12. A user equipment (UE) device comprising:
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a transceiver configured to; communicate within a device-to-device (D2D) group including at least the UE device and a second D2D UE device; receive a coverage transition indicator (CTI) from the second D2D UE device, the CTI indicating that the second UE device has left a base station service area and is no longer within coverage; and a controller configured to; determine that the D2D group is in a partial coverage scenario when a system-derived D2D timing information has been received within a maximum time period, the system-derived D2D timing information transmitted by a third UE device of the D2D group and derived from system timing received at the third UE device from a base station connected to a system network, the partial coverage scenario occurring when at least one UE device of the D2D group is within coverage; and determine that the D2D group is in an out of coverage scenario when no system-derived D2D timing information is received within the maximum time period from any UE device of the group, the out of coverage scenario occurring when all UE devices of the D2D group are out of coverage. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification