US 10,314,072 B2Granted

Scheduling request procedure for D2D communication

AssigneeSun Patent Trust

InventorsJoachim Loehr, Prateek Basu Mallick

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Abstract

The present invention relates to a D2D capable communication method and transmitting user equipment (UE) that transmits data to a receiving user equipment over a direct link data channel, and uses the services of an eNodeB in order to have resources allocated for transmitting the data. The transmitting UE sends to the eNodeB scheduling information using resources of a subframe dedicated for standard uplink communication through the eNodeB, rather than using resources of a subframe dedicated to D2D data transmission. In order to allow the eNodeB to distinguish whether the received scheduling request is for allocating resources for transmitting data over the direct link channel or over the eNodeB, the transmitting UE may send identification information associated with the scheduling information along with the scheduling information.

Claims14

Dependent claims

A communication apparatus for device to device (D2D) communication, the communication apparatus comprising:

a transmitter, which, in operation, transmits to a base station a Scheduling Request (SR) to request Uplink Shared Channel (UL-SCH) resources if a direct link Buffer Status Report (BSR) is triggered and an uplink grant is not configured and, in operation, transmits to the base station the direct link BSR on the UL-SCH resources scheduled by the uplink grant, wherein the direct link BSR is a message that informs the base station of an amount of D2D data to be transmitted to a destination user equipment;
and
a receiver, which, in operation, receives from the base station the uplink grant that schedules the UL-SCH resources in response to the transmitted SR and, in operation, receives a D2D grant that schedules D2D resources for the D2D data in response to the transmitted direct link BSR,
wherein the transmitter, in operation, transmits the D2D data to the destination user equipment on the D2D resources scheduled by the D2D grant, and
wherein an uplink BSR has a higher priority in resource scheduling than the direct link BSR, the uplink BSR being a message that informs the base station of an amount of uplink data to be transmitted to the base station.

2 more elements

Dependencies are inferred from the claim text.