Patent ID: 8665802

Claim:
A method for communicating messages by a user equipment (UE) in a mobile communication system, the method comprising: transmitting, by the UE, a physical random access channel (PRACH) preamble to a base station (BS); receiving, by the UE, a response to the PRACH preamble from the BS, wherein the response to the PRACH preamble is received through a downlink shared channel (DL_SCH) which is a transport channel located between a Physical (PHY) layer and a Medium Access Control (MAC) layer, and wherein the response to the PRACH preamble comprises an identifier identifying the UE and uplink grant information; transmitting, by the UE, a connection request message for requesting a connection to the BS using the uplink grant information, wherein the identifier assigned by the BS through the response to the PRACH preamble is used to transmit the connection request message to the BS; and receiving, by the UE, a message in response to the connection request message, from the BS.