Abstract: An apparatus and method for supporting a cooperative handover in a broadband wireless communication system. A method for operating a mobile station (MS) for a cooperative handover in a broadband wireless communication system includes determining a handover to a target BS and omitting a CID update process of the MS during the handover process to the target BS, wherein the CID of the MS is shared beforehand between a serving BS and the target BS.

Abstract: An apparatus and method for rolling back operation parameters of a base station in a self-configurable broadband wireless communication system are provided, in which in a manager server, an optimizer for determining optimized operation parameters of the base station based on information which is needed to optimize and is received from the base station, an evaluator for calculating service level of the base station using the optimized operation parameters, and a controller for requesting to roll back the optimized operation parameters when the service level is greater than or equal to a first threshold value.

Abstract: A Base Station (BS) operation method for reducing load terminals based on load estimation of a neighbor cell in a wireless communication system includes receiving information for estimating a load of a neighbor BS, determining whether to determine the power control and handover terminal set using the number of terminals serviced by the neighbor BS, the number of overload terminals among the terminals serviced by the neighbor BS, and the backoff counter value, and, when it is determined to determine a power control and handover terminal set, deciding the power control and handover terminal set to minimize load terminals, based on the first power variation and the second power variation.

Abstract: A handover method and apparatus for reducing a time delay during handover in a communication system is provided. A Mobile Station (MS) transmits a serving Base Station (BS) a first message indicating that the MS will perform handover to a target BS and the first message includes information for requesting a second message indicating a response to the successful receipt of the first message.

Abstract: An apparatus and method for performing handover in a broadband wireless communication system are provided. A communication method includes broadcasting, by a Base Station (BS), a neighbor advertisement message including neighbor cell information through each Frequency Allocation (FA); analyzing the neighbor cell advertise message by a plurality of Media Access Control (MAC) processors of an Mobile Station (MS) to obtain FA configuration information of each neighbor cell; independently determining handover by the MAC processors of the MS; generating the start of handover by one MAC which first determines handover; and determining a handover target by the remaining MAC processors so that handover is performed to different FAs of the same BS of the MAC processor which generates the start of handover by using the FA configuration information of each neighbor cell.

Abstract: An apparatus and method for efficiently manage a neighbor cell list in a mobile communication system. A method for operating a base station in a mobile communication system includes generating a neighbor cell list including at least one cell, including at least one cell among the at least one cell in a first list disallowing a handover, and disallowing a handover to the at least one cell included in the first list.

Abstract: An apparatus and a method manage power of a small base station. Whether a notify message indicating that a subscribed terminal enters a macro base station that includes an off-small base station is received from the macro base station under a closed access mode is determined. When the notify message is received, whether a service is providable to the subscribed terminal is determined. When the service is providable to the subscribed terminal, the small base station is turned on. During the closed access mode or when a load of a macro cell is large during an open access mode, when a terminal that should be serviced does not exist in the neighborhood of a small base station, an interference and power consumption unnecessarily generated may be reduced by turning off the small base station.

Abstract: An apparatus and method for supporting different frame structures in a broadband wireless communication system are provided. A communication method of a Base Station (BS) includes determining a frame structure to be provided. A MAP message including an indicator that indicates a new standard is generated, when the provided frame structure conforms to the new standard. The generated MAP message is transmitted by performing physical layer encoding thereon. Accordingly, signaling is defined to report a currently provided frame structure to an MS, and thus, a system can support different frame structures.

Abstract: A method of scheduling a subband is provided. The method includes determining whether the eNodeB is in an overload state according to a used amount of a first radio resource of the eNodeB, receiving information on a used amount of a second radio source of at least one neighbor eNodeB from the at least one neighbor eNodeB, determining whether the at least one neighbor eNodeB is in the overload state, setting a number of total subbands to be used for a subband scheduling to a number lower than a number of total subbands used by the at least one neighbor eNodeB, setting a subband scheduling start order such that the subband scheduling is started from a subband having a farthest distance in frequency from at least one subband used by the at least one neighbor eNodeB from among the set number of subbands, and performing the subband scheduling.

Abstract: A wireless communication network includes an apparatus and method for dynamically allocating frequencies of a femto Base Station (BS). An operation of the femto BS includes measuring received signal strength on system Frequency Allocations (FAs) of a plurality of macro BSs, determining maximum received signal strengths for the respective FAs, and determining an available FA set by using a result obtained from comparison between the maximum received signal strengths for the respective FAs with a first threshold.

Abstract: In a communication system, a base station transmits a message including neighbor base station information to a mobile station, wherein neighbor base stations in the base station include m first type neighbor base stations and n second type neighbor base stations, the message includes an identifier dedicatedly allocated to the mobile station when the mobile station can get a service from one of the n second type neighbor base stations, the first type is different from the second type, the neighbor base station information includes information on the n second type neighbor base stations, and each of m and n is an integer identical to or greater than 1.

Abstract: An apparatus and operation method of a Mobile Station (MS) for ranging in a broadband wireless access communication system includes receiving information for ranging code hopping from a Base Station (BS). The MS determines a hopping offset value that is a start of a ranging codes group using the information for ranging code hopping. The MS also determines a ranging codes group using the hopping offset value, and randomly selects at least one or more ranging codes among the determined ranging codes group and transmitting the selected ranging codes to the BS.

Abstract: A method and apparatus allocates a Physical Cell Identifier (PCID) in a wireless communication system by considering a PCID reuse factor. An allowable PCID list is acquired from a server. A set of candidate PCIDs is determined from the allowable PCID list according to PCID allocation conditions. A received signal strength of each cell using the determined set of candidate PCID is determined. At least one PCID is selected by using a PCID reuse factor and the received signal strength of each of the cells using the determined set of candidate PCIDs.

Abstract: An apparatus and method for configuration and optimization of an Automatic Neighbor Relation (ANR) in a wireless communication system are provided. The method of configuring the ANR by a Base Station (BS) in the wireless communication system includes receiving a measurement report message for reporting a neighbor cell's signal quality from one or more User Equipments (UEs), determining a neighbor cell, reported from a UE in an area where a serving cell's signal quality is greater than a first reference value, as an Overlay Neighbor (ON), among neighbor cells reported using the measurement report message, and determining a neighbor cell, reported from a UE in an area where the serving cell's signal quality is less than a second reference value, as a Horizontal Neighbor (HN), among the neighbor cells reported using the measurement report message, wherein the second reference value is set to a value smaller than the first reference value.

Abstract: A Base Station (BS) operation method for reducing load terminals based on load estimation of a neighbor cell in a wireless communication system includes receiving information for estimating a load of a neighbor BS, determining whether to determine the power control and handover terminal set using the number of terminals serviced by the neighbor BS, the number of overload terminals among the terminals serviced by the neighbor BS, and the backoff counter value, and, when it is determined to determine a power control and handover terminal set, deciding the power control and handover terminal set to minimize load terminals, based on the first power variation and the second power variation.

Abstract: A method and system for controlling a location update of a Mobile Station (MS) and paging the MS, taking into account location characteristics of the MS in a communication system are provided. The system for controlling the location update includes the MS for receiving a broadcasting message from a preferred BS during a PLI, for determining whether a paging group is changed, for verifying lazy location update information in the broadcasting message to delay a location update of the MS, if the paging group is changed and for updating a location of the MS according to the lazy location update information.

Abstract: A method of scheduling a subband is provided. The method includes determining whether the eNodeB is in an overload state according to a used amount of a first radio resource of the eNodeB, receiving information on a used amount of a second radio source of at least one neighbor eNodeB from the at least one neighbor eNodeB, determining whether the at least one neighbor eNodeB is in the overload state, setting a number of total subbands to be used for a subband scheduling to a number lower than a number of total subbands used by the at least one neighbor eNodeB, setting a subband scheduling start order such that the subband scheduling is started from a subband having a farthest distance in frequency from at least one subband used by the at least one neighbor eNodeB from among the set number of subbands, and performing the subband scheduling.

Abstract: An apparatus and method for supporting a handover from a macro Base Station (BS) to a micro BS in a broadband wireless communication system are provided. The apparatus includes a user layer for requesting scanning information on micro BSs among neighbor BSs and an MIH function for obtaining the scanning information on the micro BSs by interoperating with an MIH server according to the request and for transmitting the obtained information to the user layer. Accordingly, the handover from the macro BS to the micro BS can be achieved.

Abstract: An apparatus and method for supporting a cooperative handover in a broadband wireless communication system. A method for operating a mobile station (MS) for a cooperative handover in a broadband wireless communication system includes determining a handover to a target BS and omitting a CID update process of the MS during the handover process to the target BS, wherein the CID of the MS is shared beforehand between a serving BS and the target BS.

Abstract: An apparatus and a method for controlling an Energy Saving (ES) mode at a base station of a wireless communication system are provided. The method for controlling the ES mode includes predicting a traffic load of a next time, determining whether to enter the ES mode using the predicted traffic load, when determining to enter the ES mode, determining reliability of the predicted traffic load, and when the predicted traffic load is reliable, operating in the ES mode.