METHOD AND APPARATUS FOR PERFORMING A RANDOM ACCESS (RA) PROCEDURE FOR DEVICE-TO-DEVICE (D2D) SERVICE IN A WIRELESS COMMUNICATION SYSTEM

摘要

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. In addition, the method includes the UE determining that the RA procedure is successful if the UE receives a fourth message, wherein the fourth message contains either a second UL resource or at least a D2D resource depending on whether or not the BSR MAC CE is associated with the first D2D communication session and the second D2D communication session.

主权项

1. A method of a user equipment (UE) performing a random access (RA) procedure for at least a first device-to-device (D2D) communication session and a second D2D communication session, comprising:
the UE transmits a first message to a network, wherein the first message is a preamble; the UE receives a second message from the network after transmission of the first message, wherein the second message contains a first uplink (UL) resource; the UE uses 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 buffer status report (BSR) medium access control (MAC) control element (CE); and the UE determines that the RA procedure is successful when the UE receives a fourth message, wherein the fourth message contains either a second UL resource or at least a D2D resource depending on whether or not the BSR MAC CE is associated with the first D2D communication session and the second D2D communication session.