Method and apparatus of requiring uplink resources for transmitting ranging request message in communication system

An apparatus for requesting uplink resources to transmit a ranging request message by a terminal in a mobile communication system, the apparatus comprising:

• a transmission/reception unit configured to process a message transceived with a base station;
• and
• a control unit for controlling to receive a first message comprising information of a first uplink bandwidth allocated for the terminal, from a base station for fragmentizing a ranging request (RNG-REQ) message into plural fragmented RNG-REQ messages based on an allocated first uplink bandwidth if the first uplink bandwidth does not accommodate an entire RNG-REQ message, for requesting an additional uplink bandwidth through one of a bandwidth request without station id (STID) header and a piggybacked bandwidth request extended header (PBREH), and for controlling to receive a second message comprising information of an additional uplink bandwidth allocated for the terminal from the base station,
• wherein the additional uplink bandwidth is allocated based on a random access identifier used for the first uplink bandwidth allocation, and
• wherein the random access identifier is determined by concatenating least significant bit (LSB) n-bits of a superframe number, a frame index, a ranging code index, and a ranging opportunity index.

A method for allocating uplink resources to transmit a ranging request message by a base station in a mobile communication system, the method comprising:

• transmitting to a terminal a first message comprising information of a first uplink bandwidth allocated for the terminal;
• receiving an additional uplink bandwidth request message that requests an additional allocation of an uplink bandwidth through one of bandwidth request without station id (STID) header and a piggybacked bandwidth request extended header (PBREH);
• and
• transmitting to the terminal, a second message comprising information of an additional uplink bandwidth allocated for the terminal,
• wherein the additional uplink bandwidth is allocated based on a random access identifier used for the first uplink bandwidth allocation, and
• wherein the random access identifier is determined by concatenating least significant bit (LSB) n-bits of a superframe number, a frame index, a ranging code index, and a ranging opportunity index.

An apparatus for allocating uplink resources to transmit a ranging request message by a base station in a mobile communication system, the apparatus comprising:

• a transmission/reception unit configured to process a message transceived with a terminal;
• and
• a control unit for controlling to transmit a first message comprising information of a first uplink bandwidth allocated for a terminal to the terminal, for receiving an additional uplink request message that requests an additional allocation of an uplink bandwidth through one of bandwidth request without station id (STID) header and a piggybacked bandwidth request extended header (PBREH), and for controlling to transmit requested second message comprising information of an additional uplink bandwidth for the terminal to the terminal,
• wherein the additional uplink bandwidth is allocated based on a random access identifier used for the first uplink bandwidth allocation, and
• wherein the random access identifier is determined by concatenating least significant bit (LSB) n-bits of a superframe number, a frame index, a ranging code index, and a ranging opportunity index.