Abstract: An upper node is provided for use in a wireless communication system using a relay scheme. The upper node includes means for transmitting, upon a request of a lower relay station for an initial connection of the lower relay station, downlink section information for communication with the lower relay station for a relay service to the lower relay station; and means for transmitting, after the initial connection with the lower relay station, frame configuration information for communication with the lower relay station for a relay service to the lower relay station through the downlink section. The downlink section information includes configuration information of the downlink section for communication with the lower relay station for a relay service.

Abstract: An apparatus is capable of supporting an intra-BS handover of a Mobile Station (MS) that can distinguish a Relay Station (RS) and a Base Station (BS) in a multi-hop relay broadband wireless communication system. A handover of an MS in a multi-hop relay wireless communication system includes receiving a neighbor advertisement message. When a handover command message that initiates a handover to a target node is received, information on a target node is acquired, and an upper BS of the target node is identified. When the identified upper BS of the target node is the same as an upper BS of the serving node, control information that has been previously used in a serving node is used in the target node, and communication with the target node is performed.

Abstract: An apparatus and method for supporting heterogeneous systems in a multi-hop relay wireless communication system are provided. In a method of transmitting and receiving a DownLink (DL) frame of a Base Station (BS) in a multi-hop relay wireless communication system employing heterogeneous systems, the DL frame of the BS includes a legacy zone for communication with a legacy Mobile Station (MS), an access zone of a new zone for communication with a new MS, and a relay zone of the new zone for communication with a new Relay Station (RS). The method includes transmitting DL data to the legacy MS in the legacy zone, transmitting the DL data to the new MS in the access zone of the new zone, and transmitting the DL data to the new RS in the relay zone of the new zone.

Abstract: An apparatus and a method for Automatic Repeat reQuest (ARQ) feedback in a wireless communication system are provided. A method for the ARQ feedback at a receiving end includes when receiving an ARQ block from the transmitting end, checking for error in the ARQ block, when the ARQ block has no error, initializing and driving a timer used for determining whether to perform the ARQ feedback according to reception of a next ARQ block, when receiving the next ARQ block without error before the timer expires, initializing and driving the timer, and when the timer expires, performing the ARQ feedback in relation to at least one ARQ block received without error.

Abstract: Provided are a method of providing neighbor information and a method of generating neighbor location information. The method of providing neighbor information includes a base station broadcasting a neighbor advertisement message; and the base station transmitting a neighbor information message to a relay station connected to the base station.

Abstract: An apparatus and method for supporting a different system in a broadband wireless communication system using a multi-hop relay scheme are provided. A DownLink/UpLink (DL/UL) frame of a Base Station (BS) includes a legacy access zone for communicating with a legacy Mobile Station (MS), a relay zone for communicating with a legacy Relay Station (RS), and a new zone for communicating with a new MS. A DL/UL frame of an RS includes a legacy access zone for communicating with a legacy MS and a legacy relay zone for communicating with a new BS by legacy standards.

Abstract: An apparatus and method for controlling sleep cycle synchronization of a sleep mode in a wireless communication system are provided. A method of operating a Mobile Station (MS) in a sleep mode state includes, if a traffic indication message and unicast data are not received during a listening window, transmitting one of a request message and a header to a Base Station (BS) to request a location of a next-scheduled listening window, and if a response for the one of the request message and the header is received, performing synchronization for a next sleep cycle.

Abstract: An apparatus and a method for processing a change of a preamble of a Relay Station (RS) are provided. An operating method of a Base Station (BS) includes providing a relay service via an RS, determining whether a preamble of the RS needs to change, when it is necessary to change the preamble of the RS, sending a preamble change command message to the RS and, when the preamble of the RS is changed, sending a preamble change notification message informing of the preamble change to at least one lower node of the RS.

Abstract: A method and an apparatus for allocating a resource in a broadband wireless communication system are provided. In the method, a Modulation and Coding Scheme (MCS) level set and a burst size set to generate a codebook is determined. The codebook is generated using the MCS level set and the burst size set. Resource allocation information is one of generated and read according to the codebook.

Abstract: An apparatus and method for transmitting control information to a Relay Station (RS) in a multi-hop relay broadband wireless communication system is disclosed. The apparatus includes a generator, a controller, and a communication unit. The generator generates control information to be transmitted to a lower RS. The controller controls and transmits the control information during a first relay link transmission interval among at least one relay link transmission interval distributed within a frame. The communication unit transmits the control information to the lower RS.

Abstract: An apparatus and method for retransmitting data in a wireless communication system are provided. The method includes transmitting data to at least one lower node, temporarily storing the data transmitted to the lower node, if ACKnowledgement (ACK) information of a relay link is not received for a predetermined time after data transmission or if the ACK information of the relay link is received from a lower Relay Station (RS), identifying if error occurrence information of an access link is received from the lower RS, and, if the ACK information of the access link is received from the lower RS, recognizing that data transmission to a Mobile Station (MS) succeeds.

Abstract: A system and method for providing a multicast/broadcast service (MBS) using a Wireless Broadband Internet/World Interoperability for Microwave Access (WiBro/WiMAX) network are provided, which include an MBS control unit for generating a beginning and an end of an MBS bearer session, a quality of service (QoS) control unit for requesting an allocation and release of a QoS, an access control router (ACR) for allocating a multicast service flow identifier (SFID) with respect to the MBS bearer session in order to provide an MBS user terminal with MBS bearer traffic which is received from an MBS content source, and for releasing the allocated multicast SFID when the release of the QoS is requested, and a radio access station (RAS) for allocating a multicast connection identifier (CID) corresponding to the allocated multicast SFID according to whether an MBS user requests the MBS bearer traffic, and controlling a radio resource with the MBS user terminal.

Abstract: An apparatus and a method for Automatic Repeat reQuest (ARQ) feedback in a wireless communication system are provided. A method for the ARQ feedback at a receiving end includes when receiving an ARQ block from the transmitting end, checking for error in the ARQ block, when the ARQ block has no error, initializing and driving a timer used for determining whether to perform the ARQ feedback according to reception of a next ARQ block, when receiving the next ARQ block without error before the timer expires, initializing and driving the timer, and when the timer expires, performing the ARQ feedback in relation to at least one ARQ block received without error.

Abstract: Data retransmission apparatus and method in a wireless relay communication system are provided. It is checked whether an Acknowledgement (ACK) message or a Negative ACK (NACK) message for data is received from a Relay Station (RS), which receives the data from a Mobile Station (MS). Scheduling information for transmitting the data is transmitted to the RS, when the ACK message is received from the RS. Errors are checked for in of the data, when the data is received from the RS. The RS is requested to retransmit the data, when the data has an error. Accordingly, since the RS retransmits only the error-free data to the BS, the BS can enhance the data reliability.

Abstract: An apparatus and method for Automatic Repeat reQuest (ARQ) feedback polling in a wireless communication system are provided. The method for ARQ feedback polling includes transmitting at least one ARQ block to a receive end, polling ARQ feedback to the receive end using an extended header, determining if ARQ feedback information is received from the receive end within a lifetime of ARQ feedback, determining success or failure of transmission of the at least one ARQ block through the ARQ feedback information if it is determined that the ARQ feedback information is received within the lifetime of ARQ feedback, and polling ARQ feedback again to the receive end if it is determined that the ARQ feedback information is not received within the lifetime of ARQ feedback.

Abstract: An apparatus and a method for sending a control information for retransmission in a multihop relay wireless communication system are provided. Data received from a lower node is checked for errors. The data is transmitted to an upper node, when the data has no errors. When two or more information, which include at least one of Acknowledgement (ACK) and Negative ACK (NACK) in response to a data reception are received from one or more lower nodes, the two or more information are transmitted to the upper node at the same time. Accordingly, the RS can transmit the control information for the ARQ provided from the lower nodes, to the upper node at the same time.

Abstract: An apparatus and a method for Automatic Repeat reQuest (ARQ) feedback in a wireless communication system are provided. A method for the ARQ feedback at a receiving end includes when receiving an ARQ block from the transmitting end, checking for error in the ARQ block, when the ARQ block has no error, initializing and driving a timer used for determining whether to perform the ARQ feedback according to reception of a next ARQ block, when receiving the next ARQ block without error before the timer expires, initializing and driving the timer, and when the timer expires, performing the ARQ feedback in relation to at least one ARQ block received without error.

Abstract: An apparatus and a method for data retransmission in a multihop relay wireless communication system are provided. The retransmission method includes determining whether an error is detected in data received from an upper node; generating a message indicative of the data error; and sending the message to the upper node at a time that is not appointed with the upper node. Therefore, it is possible to reduce a retransmission delay time that occurs during synchronous retransmission.

Abstract: An apparatus and a method for generating an Automatic Repeat reQuest (ARQ) feedback message in a wireless communication system are provided. A method for generating an ARQ feedback message at a receiving end in a wireless communication system includes, generating first ARQ feedback information of a first scheme, the first ARQ feedback information comprising information of a first erroneous ARQ block of one or more ARQ blocks for which the ARQ feedback is not performed, generating second ARQ feedback information of a second scheme indicative of error of at least one ARQ block not represented in the first ARQ feedback information, generating an ARQ feedback message comprising the first ARQ feedback information and the second ARQ feedback information, and transmitting the ARQ feedback message to a transmitting end.

Abstract: An apparatus and method for an admission control for a service flow in a broadband wireless access communication system using a multi-hop relay scheme is provided. In a method for operating a relay station in a broadband wireless communication system using a multi-hope relay scheme, a request message requesting an admission control decision for a service flow is received from an upper node. It is determined whether a requested QoS parameter set included in the request message is supportable. If the requested QoS parameter set is supportable, the request message is forwarded to a subordinate relay station corresponding to a next hop in a data transmission path. If the requested QoS parameter set is unsupportable, a response message indicating the unsupportability of the requested QoS parameter set is transmitted to a base station.