Abstract: A method and apparatus are disclosed for handling multiple D2D grants for multiple sidelinks in decreasing order of priority. In one embodiment, the method includes a first UE participates in a first sidelink and a second sidelink, wherein a priority of the first sidelink is higher than a priority of the second sidelink. The method also includes the first UE receiving a first D2D grant and a second D2D grant from a base station in a first SA period. The method further includes the first UE serving the first sidelink with the first D2D grant and afterward, the first UE cannot serve the first sidelink with another D2D grant for the same SA period as the first D2D grant. In addition, the method includes the first UE serving the second sidelink with the second D2D grant and afterward, the first UE cannot serve the second sidelink with another D2D grant for the same SA period as the second D2D grant.

Abstract: A method and apparatus are disclosed for performing a RA procedure for at least a first D2D communication session and a second D2D communication session in a wireless communication system. The method includes a UE transmitting a first message to a network, wherein the first message is a preamble. The method also includes the UE receiving a second message from the network after transmission of the first message, wherein the second message contains a first UL resource. The method further includes the UE using the first UL resource to transmit a third message to the network after reception of the second message, wherein the third message includes at least a BSR MAC CE.

Abstract: A method and apparatus are disclosed for performing a RA procedure for a D2D communication. The method includes the UE transmitting a third message to a network, wherein the third message includes at least a first identification of the UE. The method also includes the UE determining that a contention resolution of the RA procedure is successful if the UE receives a fourth message addressed to a second identification of the UE from the network, wherein the first identification is different from the second identification.

Abstract: A method and apparatus for reception of a DCI for D2D resource scheduling. In one embodiment, the method includes a UE (User Equipment) receiving from a network a DCI addressed to a D2D RNTI (Radio Network Temporary Identifier) for D2D resource scheduling, wherein the D2D RNTI is allocated to the UE by the network. The method also includes the UE transmitting an acknowledgement to the network in response to reception of the DCI if the DCI is used to initialize a D2D resource.

Abstract: A method and apparatus for allocating resources for D2D communication are disclosed. The method includes a WCN allocating dedicated resource for a first D2D data session and common resource for a second D2D data session in a user equipment (UE), wherein the first D2D data session and the second D2D data session are active simultaneously in the UE. The method could also include the WCN receiving a corresponding request message from the UE for establishing each D2D data session. The method could further include the WCN transmitting a response message to the UE in response to reception of the corresponding request message, wherein the response message includes resource information that indicates which type of resource is allocated for each D2D data session.

Abstract: A method and apparatus for allocating discovery resource pools are disclosed. The method includes the WCN receiving a Discovery Request message from a UE. The method further includes the WCN transmitting a Discovery Response message to the UE, wherein the Discovery Response message includes information to indicate at least a discovery resource pool for the UE to use.

Abstract: A method of a UE being served by a eNB for supporting device to device (D2D) communication is disclosed. The method includes the UE receiving a message that includes information pertaining to a first resource pool provided by the eNB, wherein resources of the first resource pool are common resources shared by more than one UE using the first resource pool. The method further includes the UE being configured with a second resource pool provided by the eNB, wherein the second resource pool is different from the first resource pool. Furthermore, the method includes the UE selecting resource(s) from the second resource pool and uses the selected resource(s) for D2D transmission.

Abstract: A method and apparatus are disclosed to implement DRX (Discontinuous Reception) in a UE (User Equipment). The method includes configuring the UE with at least a small cell, and serving the UE with a macro cell, wherein the macro cell is controlled by a MeNB (Master evolved Node B) and the small cell is controlled by a SeNB (Secondary evolved Node B). In addition, the method includes configuring DRX with a plurality of drxStartOffset parameters, wherein at least one of the drxStartOffset parameters is used for the MeNB and at least one of the drxStartOffset parameters is used for the SeNB. Furthermore, the method includes starting the UE on an onDurationTimer when a drxStartOffset condition is satisfied.