Abstract: Provided is a method for performing handover by a STAtion (STA) in a radio Local Access Network (LAN) communication system. The method includes sending a Network Controlled HandOver Setup Request Information Element (Ncho Setup Req IE) message indicating that the STA is to perform a scan operation using a controlled scan scheme, to a serving Access Point (AP); receiving a Network Controlled HandOver Setup Response Information Element (Ncho Setup Rsp IE) message including a scan parameter related to a controlled scan operation of the STA, from the serving AP; and broadcasting a probe request message to the serving AP and neighbor APs over channels according to the scan parameter included in the Ncho Setup Rsp IE message.

Abstract: An apparatus and method for providing/receiving a voice service in a Wireless Local Access Network (WLAN) system. In the voice service provision method, an Access Point (AP) generates a multiplexing voice data packet by performing a multiplexing operation on at least two voice data packets among received voice data packets, and performs a multicast operation of multicasting the multiplexing voice data packet to Mobile Stations (MSs) which should receive the at least two voice data packets.

Abstract: A method of performing an uncontrolled handover data integrity of a target Base Station (BS) is provided. The method includes receiving an initial access request message from a Mobile Station (MS) by the target BS, performing a negotiation for establishing a handover data integrity path with a serving BS through a serving Access Service Network-Gateway (ASN-GW) by the target BS, and generating a main data path and a first handover data integrity path with the serving ASN-GW according to a result of the negotiation by the target BS.

Abstract: An apparatus and method for dynamically allocating a multicast path in a broadband wireless access system are provided. A method for an operation of a server providing a multicast service through a wireless access network includes determining to establish multicast paths for a first Base Station (BS) and at least one neighboring BS of the first BS when a terminal receiving the multicast service enters a network through the first BS, and transmitting a control station a message of instructing to establish the multicast path for a BS not holding the multicast path among the first BS and the at least one neighboring BS of the first BS.

Abstract: Scanning cycle synchronization of a multicast service in a broadband wireless access system is provided. Multicast group information of a multicast group to which a Mobile Station (MS) belongs is received at the MS from an application server. A scanning cycle pattern and a scan offset of a multicast service corresponding to the multicast group are determined. A scanning cycle of the multicast is set according to the scanning cycle pattern and the scan offset. Scanning and reception of multicast data are performed according to the scanning cycle.

Abstract: An apparatus and a method for managing an access state of a terminal for a group communication service in a wireless communication system are provided. In a method for operating a terminal for a group communication service in a wireless communication system, a bandwidth ranging message is transmitted to a base station in an idle state. The terminal is allocated an uplink resource from the base station. A message for access state transfer including a multicast Connection IDentifier (CID) is generated. The message for access state transfer is transmitted to the base station via the allocated uplink resource.

Abstract: An apparatus and method for providing/receiving a voice service in a Wireless Local Access Network (WLAN) system. In the voice service provision method, an Access Point (AP) generates a multiplexing voice data packet by performing a multiplexing operation on at least two voice data packets among received voice data packets, and performs a multicast operation of multicasting the multiplexing voice data packet to Mobile Stations (MSs) which should receive the at least two voice data packets.

Abstract: An apparatus and a method for setting a group communication session using a wireless access system are provided. The method includes transmitting, at a transmission side client, a message requesting start/end of group communication to a control Push To Talk (PTT) server, transmitting, at the control PTT server, a session set/end message including a sequence number to a participating PTT server, multicasting, at the participating PTT server, a connect/disconnect request message N times for at least one reception side client, and setting/releasing, at the at least one reception side client, a session for the group communication.

Abstract: Provided is a method for performing handover by a STAtion (STA) in a radio Local Access Network (LAN) communication system. The method includes sending a Network Controlled HandOver Setup Request Information Element (Ncho Setup Req IE) message indicating that the STA is to perform a scan operation using a controlled scan scheme, to a serving Access Point (AP); receiving a Network Controlled HandOver Setup Response Information Element (Ncho Setup Rsp IE) message including a scan parameter related to a controlled scan operation of the STA, from the serving AP; and broadcasting a probe request message to the serving AP and neighbor APs over channels according to the scan parameter included in the Ncho Setup Rsp IE message.

Abstract: An apparatus and a method for managing an access state of a terminal for a group communication service in a wireless communication system are provided. In a method for operating a terminal for a group communication service in a wireless communication system, a bandwidth ranging message is transmitted to a base station in an idle state. The terminal is allocated an uplink resource from the base station. A message for access state transfer including a multicast Connection IDentifier (CID) is generated. The message for access state transfer is transmitted to the base station via the allocated uplink resource.

Abstract: An apparatus and method for dynamically allocating a multicast path in a broadband wireless access system are provided. A method for an operation of a server providing a multicast service through a wireless access network includes determining to establish multicast paths for a first Base Station (BS) and at least one neighboring BS of the first BS when a terminal receiving the multicast service enters a network through the first BS, and transmitting a control station a message of instructing to establish the multicast path for a BS not holding the multicast path among the first BS and the at least one neighboring BS of the first BS.

Abstract: A method of performing an uncontrolled handover data integrity of a target Base Station (BS) is provided. The method includes receiving an initial access request message from a Mobile Station (MS) by the target BS, performing a negotiation for establishing a handover data integrity path with a serving BS through a serving Access Service Network-Gateway (ASN-GW) by the target BS, and generating a main data path and a first handover data integrity path with the serving ASN-GW according to a result of the negotiation by the target BS.

Abstract: There are provided a method for managing neighbor Base Station (BS) information in a mobile communication system, and a system thereof. A femto Access Service Network-Gateway (ASN-GW) controls at least one femto BS, manages scan information that an MS served by a macro BS requires in measuring at least one signal strength by scanning the at least one femto BS, creates the scan information in a format of Downlink Channel Descriptor (DCD) and Uplink Channel Descriptor (UCD) information, and transmits the scan information to the macro BS. The macro BS periodically broadcasts neighbor BS information of the femto BS, which includes the scan information, to MSs in its coverage using a Neighbor Advertisement (NBR-ADV) message.

Abstract: A system and method for performing paging in an area where a macro Base Station (BS) and a femto Access Services Network (ASN) are linked in a mobile network are provided. The method includes, during handover of a Mobile Station (MS) between a macro ASN and a femto ASN, a first gateway of a current ASN acquires paging group information of a previous ASN. Upon request for paging from the MS in the current ASN, the first gateway requests a BS of the previous ASN to transmit paging information to the MS based on the paging group information of the previous ASN. By doing so, paging success rate may be improved for an MS in coverage of a macro ASN linked to a femto BS, and the high paging success rate may be guaranteed regardless of whether the handover scheme is a controlled handover scheme or an uncontrolled handover scheme.

Abstract: Scanning cycle synchronization of a multicast service in a broadband wireless access system is provided. Multicast group information of a multicast group to which a Mobile Station (MS) belongs is received at the MS from an application server. A scanning cycle pattern and a scan offset of a multicast service corresponding to the multicast group are determined. A scanning cycle of the multicast is set according to the scanning cycle pattern and the scan offset. Scanning and reception of multicast data are performed according to the scanning cycle.

Abstract: An apparatus and a method for setting a group communication session using a wireless access system are provided. The method includes transmitting, at a transmission side client, a message requesting start/end of group communication to a control Push To Talk (PTT) server, transmitting, at the control PTT server, a session set/end message including a sequence number to a participating PTT server, multicasting, at the participating PTT server, a connect/disconnect request message N times for at least one reception side client, and setting/releasing, at the at least one reception side client, a session for the group communication.

Abstract: A system and method for performing paging in an area where a macro Base Station (BS) and a femto Access Services Network (ASN) are linked in a mobile network are provided. The method includes, during handover of a Mobile Station (MS) between a macro ASN and a femto ASN, a first gateway of a current ASN acquires paging group information of a previous ASN. Upon request for paging from the MS in the current ASN, the first gateway requests a BS of the previous ASN to transmit paging information to the MS based on the paging group information of the previous ASN. By doing so, paging success rate may be improved for an MS in coverage of a macro ASN linked to a femto BS, and the high paging success rate may be guaranteed regardless of whether the handover scheme is a controlled handover scheme or an uncontrolled handover scheme.

Abstract: There are provided a method for managing neighbor Base Station (BS) information in a mobile communication system, and a system thereof. A femto Access Service Network-Gateway (ASN-GW) controls at least one femto BS, manages scan information that an MS served by a macro BS requires in measuring at least one signal strength by scanning the at least one femto BS, creates the scan information in a format of Downlink Channel Descriptor (DCD) and Uplink Channel Descriptor (UCD) information, and transmits the scan information to the macro BS. The macro BS periodically broadcasts neighbor BS information of the femto BS, which includes the scan information, to MSs in its coverage using a Neighbor Advertisement (NBR-ADV) message.