Patent ID: 8422410
Filing Date: 2013-04-16
Classification: H04L,H04W

Abstract:
1. A method of transmitting data by a user equipment (UE) through an uplink, the method comprising: starting, by the UE, a contention resolution (CR) timer when a message 3 (Msg3) of a random access procedure is transmitted by the UE to a base station, wherein the Msg3 comprises a Medium Access Control Protocol Data Unit (MAC PDU) in a Hybrid Automatic Repeat Request (HARQ) buffer, and wherein the MAC PDU in the HARQ buffer is a copy of a MAC PDU in a Msg3 buffer; flushing, by the UE, the HARQ buffer used for transmission of the MAC PDU in the Msg3 buffer, if the CR timer is expired; receiving, by the UE, an uplink grant (UL Grant) signal from the base station through a Physical Downlink Control Channel (PDCCH) identified by a Cell-Radio Network Temporary Identifier (C-RNTI); determining, by the UE, whether the UL Grant signal is received through the PDCCH identified by the C-RNTI and the HARQ buffer is empty; and transmitting, by the UE, new data to the base station, if the UL Grant signal is received through the PDCCH identified by the C-RNTI and the HARQ buffer is empty.