Patent ID: 7885247

Claim:
A method of receiving an extended subheader while communicating between entities in a mobile communication system, the method comprising: receiving, by a base station from a mobile station, a Protocol Data Unit (PDU) including a Medium Access Channel (MAC) header; determining, by a base station, from an Extended Subheader Format (ESF) field in the MAC header whether one or more extended subheaders are present, wherein the one or more extended subheaders are not encrypted and are included in an extended subheader group that appears immediately after the MAC header and before all subheaders; and identifying, by the base station, the one or more extended subheaders from the extended subheader group, wherein the one or more extended subheaders are selected from a MIMO mode feedback extended subheader, an uplink (UL) transmission power report extended subheader, a mini-feedback extended subheader, a PDU SN(short) extended subheader and a PDU SN(long) extended subheader.