Abstract: A method of relaying in a base station (BS) includes: setting, when a backhaul link of a first BS is damaged, a relay link using a second BS, which is an adjacent BS of the first BS as a serving BS; and releasing the relay link after the backhaul link is recovered.

Abstract: A signaling method of a first terminal for direct communication between terminals includes transmitting a link establishment request message for establishing a direct communication link including flow information to a second terminal, receiving a link establishment response message for establishing a direct communication link including flow information from the second terminal, and establishing a direct communication link between the first terminal and the second terminal.

Abstract: A method of establishing a multicast connection is provided. A mobile station transmits a registration request message for a discovery of a multicast service to the base station, and receives a registration response message from the base station in response to the registration request message. The mobile station exchanges a DSA request message and a DSA response message to the DSA request message with the base station, for a multicast connection on the multicast service. The mobile station receives a downlink control channel including allocation information of multicast resource from the base station.

Abstract: A method of allocating a multicast resource to a multicast group for a multicast communication in a base station is provided. The base station persistently allocates the multicast resource to the multicast group, generates a MAP IE including allocation information of the multicast resource, an allocation period indicating a period in which the multicast resource is allocated and a lifetime in which allocation of the multicast resource is maintained, and transmitting the MAP IE to the multicast group.

Abstract: Disclosed are a system and a method for receiving an MBMS broadcasting service. In the present invention, in a mobile communication/wireless communication system, an MBMS service is provided by synchronizing a unicast bearer with a multicast bearer through scheduling information mapping at the time of transmitting a broadcast/multicast service through a unicast. Further, the present invention presents even a method for improving quality of experience (QoE) of the service by providing the MBMS service through the multicast bearer and the unicast bearer simultaneously. According to the present invention, MBMS services of various service qualities can be provided depending on wireless quality of a terminal or the capability of the terminal at the time of providing the MBMS service.

Abstract: Disclosed is a system for providing an Evolved Multimedia Broadcast/Multicast Service (EMBMS) chatting service for providing a multi-chatting service. The system comprises at least one of a User Equipment (UE) to request establishment of a chatting channel and to transmit and receive a communication message and contents so as to transmit and receive the communication message with a plurality of mobile subscribers participated in the chatting channel, an evolved Broadcast Multicast-Service Center (eBM-SC) to perform control of an EMBMS service so as to transmit the communication message to the at least one of the UE using the EMBMS service, and a service provider server to transmit, to the eBM-SC, user service information, first bearer service information, and contents for each of the chatting channels, so that the UE transmits and receives the communication message with the plurality of the mobile subscribers participated in the chatting channel.

Abstract: In a communication system, a plurality of radio access systems (RASs) respectively receives connection resources from an MBS server for transmitting a multicast broadcast data packet. The MBS server is involved in transmission of the multicast broadcast data packet. Then, the plurality of RASs receive the multicast broadcast data packet including parameters for synchronization between the plurality of RASs and parameters for size and location of the multicast broadcast data packet and deliver the received multicast broadcast data packet to a portable subscriber station (PSS). Thereby, the plurality of RASs can transmit the multicast broadcast data packets with the same location and the same size to the PSSs at the same time.

Abstract: Provided is a method and apparatus for reducing zapping delay, which may transmit base layer data for each burst in a time-slicing scheme, and output the base layer data of a channel to be changed at the time of changing the channel, thereby reducing the zapping delay.

Abstract: The present invention relates to a security association negotiation method of extensible authentication protocol (EAP) for authenticating a subscriber station user in a wireless portable Internet system. An exemplary security association negotiation method using a user authentication in a wireless portable Internet system according to an embodiment of the present invention includes following steps. A base station generates an authentication key for authenticating a user of a subscriber station. The base station receives a security association capability request message including security association capability information of the subscriber station from the subscriber station after generating the authentication key. The base station determines whether the base station is able to accept a security association capability of the subscriber station included in the security association capability request message.

Abstract: A data transmission method of a Multimedia Broadcast/Multicast Service (MBMS) system is provided. The data transmission method includes scheduling multimedia data including a plurality of sub-frames to be transmitted for each of a plurality of scheduling intervals, generating scheduling information, and transmitting, in advance, the scheduling information to a terminal, so that the terminal may selectively receive a plurality of sub-frames corresponding to a first scheduling interval, based on the scheduling information.

Abstract: Provided is the broadcast service controlling apparatus and method. The broadcast service controlling method may perform grouping, into a broadcast group, broadcast services having the same transmission feature, may control scheduling information associated with the broadcast services included in the broadcast group and thus, may dynamically perform scheduling with respect to broadcast services.

Abstract: The present invention relates to a method of providing a multicast broadcast service. A message for providing an MBS (Multicast Broadcast Service) between network constituent elements is defined by applying a message defined in a wireless channel, and functions and parameters to be performed by the network constituent elements are defined. Therefore, the MBS can be provided in a wideband wireless access network that is a field of a mobile communication system and includes a wire channel.

Abstract: A method for transmitting a handover security context of a first access point, when an access terminal from a service cell of a first access point is connected to a packet access router, to a service cell of a second access point connected to the packet access router, is provided. The handover security context transmitting method includes confirming whether a handover confirmation message transmitted from the access terminal has a security context therein; when the handover confirmation message has a security context therein, confirming whether the security context has security-related information therein; when the security context has security-related information therein, confirming whether the security context has a traffic-related key or a pairwise master key; and transmitting an information instruction message including the security related information confirmed in the security context, the security-related information, the traffic-related key, and the pairwise master key through the PAR to the second AP.

Abstract: In a communication system, a plurality of radio access systems (RASs) respectively receives connection resources from an MBS server for transmitting a multicast broadcast data packet. The MBS server is involved in transmission of the multicast broadcast data packet. Then, the plurality of RASs receive the multicast broadcast data packet including parameters for synchronization between the plurality of RASs and parameters for size and location of the multicast broadcast data packet and deliver the received multicast broadcast data packet to a portable subscriber station (PSS). Thereby, the plurality of RASs can transmit the multicast broadcast data packets with the same location and the same size to the PSSs at the same time.

Abstract: The present invention relates to a wireless communication system and a service flow identifier management method thereof. The wireless communication system includes a plurality of RASs for controlling a plurality of PSSs in a radio network, and a plurality of ACRs for providing wireless communication services to the PSSs through the plurality of RASs, and respectively managing a service flow identifier used for identifying a connection service for each PSS. When a status of each service flow identifier managed by the plurality of ACRs is different, the wireless communication system releases the corresponding service flow identifier so as to set the status of each of the service flow identifiers to be the same. According to the present invention, in the wireless communication system, the plurality of ACRs separately manage service flow identifiers, and mismatched service flow identifier information due to errors in the system or a node or message transmission/receiving errors can be set to be the same.

Abstract: The present invention relates to a security association negotiation method of extensible authentication protocol (EAP) for authenticating a subscriber station user in a wireless portable Internet system. An exemplary security association negotiation method using a user authentication in a wireless portable Internet system according to an embodiment of the present invention includes following steps. A base station generates an authentication key for authenticating a user of a subscriber station. The base station receives a security association capability request message including security association capability information of the subscriber station from the subscriber station after generating the authentication key. The base station determines whether the base station is able to accept a security association capability of the subscriber station included in the security association capability request message.

Abstract: A method for transmitting a handover security context of a first access point, when an access terminal from a service cell of a first access point is connected to a packet access router, to a service cell of a second access point connected to the packet access router, is provided. The handover security context transmitting method includes confirming whether a handover confirmation message transmitted from the access terminal has a security context therein; when the handover confirmation message has a security context therein, confirming whether the security context has security-related information therein; when the security context has security-related information therein, confirming whether the security context has a traffic-related key or a pairwise master key; and transmitting an information instruction message including the security related information confirmed in the security context, the security-related information, the traffic-related key, and the pairwise master key through the PAR to the second AP.

Abstract: Disclosed is a call admission controlling device and method for providing QoS (quality of service) in the portable Internet. When a mobile terminal requests a guarantee of the corresponding QoS and a call admission, a packet access router calculates a bandwidth available for resource reservation according to mobility characteristics of a cell to which the mobile terminal belongs, and determines resource reserved states according to the mobility characteristics with adjacent cells based on the calculated bandwidth to thus control call admission in order to satisfy a handoff dropping probability of the corresponding cell and prevent disconnected calls when a handoff toward the adjacent cells occurs. As a result, the handoff dropping probability of cells is guaranteed, and the resources are utilized effectively.