Access control method and apparatus for use in mobile communication

A method of a source base station in a mobile communication system, the method comprising:

• receiving, from a user equipment (UE), UE capability information including an indicator for handover without random access;
• transmitting, to a target base station, a handover request message;
• receiving, from the target base station, a handover request acknowledgement (ACK) message;
• and
• transmitting, when the handover request ACK message includes uplink resource information, a radio resource control (RRC) connection reconfiguration message including the uplink resource information to the UE,
• wherein the uplink resource information is used for transmission of an RRC connection reconfiguration complete message from the UE to the target base station, and
• wherein, when the RRC connection reconfiguration message does not include the uplink resource information, the RRC connection reconfiguration complete message is transmitted based on uplink resource information included in control information received on a physical downlink control channel (PDCCH) of the target base station.

A method of a target base station in a mobile communication system, the method comprising:

• receiving, from a source base station, a handover request message;
• transmitting, to the source base station, a handover request acknowledgement (ACK) message;
• and
• receiving, when the handover request ACK message includes uplink resource information, a radio resource control (RRC) connection reconfiguration complete message from a user equipment (UE) based on the uplink resource information,
• wherein, when the handover ACK message includes no uplink resource information, the RRC connection reconfiguration complete message is received based on uplink resource information included in control information transmitted on a physical downlink control channel (PDCCH).

A user equipment (UE) in a mobile communication system, the UE comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to:
• transmit, to a source base station, UE capability information including an indicator for handover without random access,
• receive, from the source base station, a radio resource control (RRC) connection reconfiguration message for handover command,
• transmit, when the RRC connection reconfiguration message includes uplink resource information, an RRC connection reconfiguration complete message to a target base station based on the uplink resource information, and
• monitor, when the RRC connection reconfiguration message does not include the uplink resource information, a physical downlink control channel (PDCCH) of the target base station.

A source base station in a mobile communication system, the source base station comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to:
• receive, from a user equipment (UE), UE capability information including an indicator for handover without random access,
• transmit, to a target base station, a handover request message,
• receive, from the target base station, a handover request acknowledgement (ACK) message, and
• transmit, when the handover request ACK message includes uplink resource information, a radio resource control (RRC) connection reconfiguration message including the uplink resource information to the UE,
• wherein the uplink resource information is used for transmission of an RRC connection reconfiguration complete message from the UE to the target base station, and
• wherein, when the RRC connection reconfiguration message does not include the uplink resource information, the RRC connection reconfiguration complete message is transmitted based on uplink resource information included in control information received on a physical downlink control channel (PDCCH) of the target base station.

A target base station in a mobile communication system, the target base station comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to:
• receive, from a source base station, a handover request message,
• transmit, to the source base station, a handover request acknowledgement (ACK) message, and
• receive, when the handover request ACK message includes uplink resource information, an RRC connection reconfiguration complete complete message from a user equipment (UE) based on the uplink resource information,
• wherein, when the handover ACK message includes no uplink resource information, the RRC connection reconfiguration complete message is received based on uplink resource information included in control information transmitted on a physical downlink control channel (PDCCH).