Method of transmitting and receiving radio access information in a wireless mobile communications system

A mobile terminal for transmitting uplink data in a wireless communication system, the mobile terminal comprising:

• a transceiver configured to transmit or receive the uplink data;
• a memory configured to store the uplink data transmitted or received via the transceiver or from an external source;
• and
• a processor cooperating with the transceiver and the memory, the processor configured to:
• receive, from a network, preamble information generated by the network, wherein the preamble information is received via dedicated signaling in downlink, wherein the preamble information is used for performing a random access channel (RACH) procedure, wherein the received preamble information is either a dedicated preamble or an index of the dedicated preamble, and wherein the dedicated preamble is used for a specific terminal;
• transmit, to the network, the dedicated preamble on a random access channel (RACH) in uplink;
• receive a random access response in response to the transmitted dedicated preamble, wherein the random access response includes at least one of time information for a handover operation, an uplink grant for the handover operation, time information for a downlink data arrival, or a random access preamble identifier;
• and
• transmit the uplink data to the network using the uplink grant included in the random access response.

A method of transmitting uplink data in a wireless communication system comprising:

• receiving, via signaling in downlink, in a terminal from a source base station after the source base station has determined that a handover should occur to a target base station, information related to a preamble, wherein the information related to the preamble was previously defined in a message sent from the target base station to the source base station,
• wherein the received information related to the preamble is used for performing a random access channel (RACH) procedure, and
• wherein the information related to the preamble is used by the terminal to avoid a collision while performing a handover by the terminal to the target base station;
• transmitting, from the terminal to the target base station, the preamble on a random access channel (RACH) in uplink;
• receiving, in the terminal, in response to the transmitted preamble, a random access response for uplink, wherein the random access response includes an uplink grant for the handover;
• and
• transmitting the uplink data to the target base station using the uplink grant included in the random access response.

A mobile terminal configured to transmit uplink data in a wireless communication system, the mobile terminal comprising:

• a transceiver configured to transmit the uplink data;
• a memory configured to store uplink data;
• and
• a processor cooperating with the transceiver and the memory, the processor configured to:
• receive, at the terminal from a source base station a command that a handover should occur to a target base station, the command including information related to a preamble, wherein the information related to the preamble is received via signaling in downlink via the source base station from the target base station,
• wherein the received information related to the preamble is used for performing a random access channel (RACH) procedure, and
• wherein the information related to the preamble is used by the terminal to avoid a collision while performing a handover by the terminal to the target base station;
• transmit, from the terminal to the target base station the preamble on a random access channel (RACH) in uplink;
• receive, in the terminal, in response to the transmitted preamble, a random access response for uplink, wherein the random access response includes an uplink grant for the handover;
• and
• transmit the uplink data to the target base station using the uplink grant included in the random access response.

A method of performing a handover of a terminal to a target base station in a wireless communication system, the method comprising:

• transmitting, by the terminal, measurement information to a source base station;
• receiving, by the terminal, and after the source base station has determined that a handover should occur to the target base station, a handover command message from the source base station, wherein the handover command message includes access information, and the access information includes information related to a preamble as identified by the target base station for use by the terminal during a random access procedure with the target base station, wherein the information related to the preamble is used by the terminal to avoid a collision while performing the handover to the target base station;
• establishing, by the terminal, and in response to the handover command message, a radio connection with the target base station, wherein the terminal connects with the target base station during the random access procedure using the preamble;
• and
• transmitting, by the terminal, a handover complete message to the target base station.

A system comprising:

• a source base station;
• a target base station;
• and
• a mobile terminal configured to transmit uplink data in a wireless communication system, the mobile terminal comprising:
• a transceiver configured to transmit the uplink data;
• a memory configured to store uplink data;
• and
• a processor cooperating with the transceiver and the memory, the processor configured to:
• receive, at the terminal from the source base station, and after the source base station has determined that a handover should occur to the target base station, information related to a preamble, wherein the information related to the preamble is received via signaling in downlink from the target base station,
• wherein the received information related to the preamble is used for performing a random access channel (RACH) procedure, and
• wherein the information related to the preamble is used by the terminal to avoid a collision while performing a handover by the terminal to the target base station;
• transmit, from the terminal to the target base station the preamble on a random access channel (RACH) in uplink;
• receive, in the terminal, in response to the transmitted preamble, a random access response for uplink, wherein the random access response includes an uplink grant for the handover;
• and
• transmit the uplink data to the target base station using the uplink grant included in the random access response.