Patent ID: 9681355
Date: 2017-06-13
CPC Classifications: H04L,H04W

Claim:
1. A method of performing handover by a mobile terminal from a source base station to a target base station, the mobile terminal having a Radio Resource Control (RRC) layer and a Radio Link Control (RLC) layer, the method comprising: receiving, at the RRC layer of the mobile terminal, a handover command; receiving, at the RLC layer of the mobile terminal, an indication associated with the handover command; reassembling, at the RLC layer of the mobile terminal, at least one RLC service data unit (SDU) from at least one protocol data unit (PDU) having a sequence number that is less than a higher edge of a window of the mobile terminal, wherein the higher edge of the window of the mobile terminal corresponds to a sequence number following a highest sequence number among at least one PDU received out of sequence by the RLC layer of the mobile terminal; delivering, at the RLC layer of the mobile terminal, the reassembled at least one RLC SDU to an upper layer of the mobile terminal; discarding, at the RLC layer of the mobile terminal, at least one remaining PDU that could not be reassembled into at least one RLC SDU; and initializing a state variable associated with the window of the mobile terminal.