US Patent No. 10,143,017

METHOD AND APPARATUS FOR OPERATING BUFFER STATE REPORT IN WIRELESS COMMUNICATION SYSTEM SUPPORTING DEVICE TO DEVICE COMMUNICATION


Patent No. 10,143,017
Issue Date November 27, 2018
Title Method And Apparatus For Operating Buffer State Report In Wireless Communication System Supporting Device To Device Communication
Inventorship Ki Bum Kwon, Seoul (KR)
Assignee Innovative Technology Lab Co., Ltd., Seoul (KR)

Claim of US Patent No. 10,143,017

1. A method of supporting a buffer status report (BSR) associated with a device-to-device (D2D) communication, the method comprising: establishing a radio resource control (RRC) connection with an evolved NodeB (eNB) and receiving configuration information associated with a D2D communication from the eNB, the configuration information comprising information of a resource allocation mode for a D2D data transmission and information of a timer associated with a BSR for a D2D data transmission; determining, by a user equipment (UE), a radio link failure (RLF), the RLF being associated with a connection problem of the RRC connection; initializing a re-establishment process for the RRC connection; canceling all BSRs for a D2D data transmission in response to the determined RLF, the canceled BSRs for a D2D data transmission being associated with a D2D data transmission scheduled by the eNB; initializing the timer associated with a BSR for a D2D data transmission; determining, by the UE, a change from the resource allocation mode for a D2D data transmission to a resource selection mode when an exceptional case occurs; and in the resource selection mode, selecting, by the UE, a resource for transmitting D2D data from a resource pool, wherein the exceptional case comprises: a case where upon detecting the RLF, the initialization of the re-establishment process for the RRC connection has been initiated and a T311 timer associated with the re-establishment process for the RRC connection has been started, receiving information of CommTxPoolExceptional for a D2D data transmission for the exceptional case, wherein the CommTxPoolExceptional is information of a resource pool for a D2D data transmission when the exceptional case occurs.