MXPA06014059A - Scanning neighboring base stations in wireless access system - Google Patents

Abstract

Scanning neighboring base stations in a wireless access system is provided. In one embodiment, a method of scanning neighboring base stations for assessing channel quality includes receiving from a serving base station information associated with at least one neighboring base station, and transmitting a scanning request message from a mobile subscriber station to the serving base station, wherein the scanning request message comprises a requested scan duration and a requested scan iteration, the requested scan iteration being associated with a requested number of iterations of the scanning of the at least one neighboring base station. The method also includes receiving a scanning response message from the serving base station, wherein the scanning response message comprises an allowed scan duration and an allowed scan iteration, the allowed scan iteration being associated with an allowed number of iterations of the scanning of the at least one neighboring base station.

Description

SCANNING OF BASE STATIONS NEIGHBORS IN WIRELESS ACCESS SYSTEM TECHNICAL FIELD The present invention relates, in general terms, to a wireless access system, and more particularly to the scanning of neighboring base stations in wireless access system. BACKGROUND OF THE TECHNIQUE The IEEE802.16e system is part of a global standardization for broadband wireless access systems. The IEEE802.16e system does not have a hierarchical structure of HLR, VLR, MSC, BSC, RNC, etc., unlike second and third generation mobile communication systems, but includes a mobile subscriber station (MSS), a base station (BS), and an authentication service authorization server (ASA Server). A physical layer (PHY) and a medium access control layer (MAC) are defined between the base station (BS) and the mobile subscriber station (MSS). Figure 1 is a block diagram illustrating a broadband wireless access system of the related art in which the transfer operation is performed in a data plane. Figure 2 is a block diagram illustrating a broadband wireless access system of the related art where an operation is performed. of transfer in a control plane. With reference to Figure 1 and Figure 2, a transfer in a broadband wireless access system made in accordance with IEEE802.1ße will be explained below. 1. Pre-processing for transfer Pre-processing for transfer includes the dissemination of associated information from a base station to a neighboring base station to report the associated information (Network Topology Advertise ent) to all mobile subscriber stations within a respective cell. The pre-processing also includes the measurement of a channel quality of the neighboring base station based on the associated information (MSS Scan of neighboring BS). The pre-processing also includes the matching of parameters between the base station and the neighboring base station, such as for example an initial mobile subscriber station power, a time difference for synchronization, and other parameters (Association Procedures). to. Network Topology Announcement In a network topology advertisement, the base station broadcasts information associated with the network configuration to all mobile subscriber stations within a cell via a MOB NBR-ADV MAC message, providing for consequently to all its mobile subscriber stations within the cell the information pertaining to neighboring base stations. b. Neighboring BS MSS scan In the neighboring BSS MSS scan, a mobile subscriber station (MSS) scans a neighboring base station (BS) and requests a scan interval to scan the neighboring BS from a BS through a BS message MOB_SCN-REQ MAC. The BS then transmits a message MOB_SCN-RSP MAC for response to the request to assign it a range to scan (Scan interval) the neighbor BS. Alternatively, the BS can directly transmit the message MOB_SCN_RSP MAC without request of the MSS (unsolicited response). In the case of an unsolicited response, the scan interval and a lag unit for scan start are assigned on a frame unit basis. c. Association Procedures During association procedures, the MSS performs a detection process with a BS to normally enter a cell. In the detection process, the MSS acquires basic information for communications from the BS. In other words, the MSS performs a BS scan to select a new BS and then carries out the association procedures. The MSS and the BS transmit an RNG message REQ MAC and message RNG_RSP MAC, respectively, to adjust values such as, for example, a power offset value, a timing offset value, and other MSS values at the appropriate values. The transmission of the RNG_REQ MAC message is known as the initial detection operation and is a basic operation that MSS can perform in a network entry procedure. When a transfer is made, a white BS accepts a new MSS and transmits elements associated with the respective cell of the new MSS to the previous serving BS and stores the information belonging to the MSS. 2. Transfer Process In a transfer process (HO), the MSS initiates a transfer with neighboring BSs based on the quality information and channel acquired in the transfer pre-processing. to. Cell Selection Figure 3 is a diagram illustrating a cell selection procedure of the related art in a broadband wireless access system of the related art. In a cell selection procedure, a cell is changed to allow the MSS to perform a new registration to a BS allowing the reception of a signal having a SINR (Ratio between signal and interference plus noise) greater than the SINR of a signal transmitted from the BS of the current cell, before a normal record of the MSS to a cell. In such a case, since the MSS does not perform the registration procedure, the BS can not determine a movement situation of the MSS. b. Start of HO (Transfer) When initiating an HO, the transfer can be initiated by the MSS or by the BS. When the BS requests (initiates) a transfer, the BS transmits a message MOB_BSHO-REQ M? C to the MSS. On the contrary, when the MSS requests a transfer, the MSS transmits a message MOB_MSSHO-REQ MAC to the BS. If the MSS transmits a message. MOB_MSSHO-REQ MAC, the MSS preferably transmits the SINR of a signal received from a neighbor BS to the BS to allow transmission of the message MOB_MSSSHO-REQ MAC to a current service BS. The current service BS then selects a candidate BS as a white BS to effect the transfer. In the case in which the BS receives the message MOB_MSSHO-REQ MAC from the MSS or in the case in which the BS has not yet transmitted the message MOB_BSHO-REQ MAC for transfer to the MSS, the BS can allow the transfer of the message. the MSS after the configuration of an acknowledgment (ACK) for handling in a specific MSS from the neighboring BS. After receiving the message MOB_BSHO / MSSHO-REQ MAC, the MSS / BS transmits a message MOB_MSSHO / BSHO-RSP MAC to inform the BS / MSS of a white BS for the transfer. c. Cancellation of HO (Transfer) On cancellation of HO, after transmission by MSS / BS of message MOB_MSSHO / BSHO-REQ MAC, the MSS can cancel the transfer. When canceling the HO (transfer), the MSS establishes a specific field (HO_Type = 01) of a message MOB_HO-IND MAC and transmits the established field to the BS. The BS receives the message and cancels a transfer in process. d. Termination with the Service BS Upon termination of the service BS, the MSS transmits the message MOB_HO-IND MAC to inform the service BS that the transfer was effected normally and then the transfer operation ends. Upon completion of the transfer operation, the MSS establishes a specific field (HO_Type = 00) of the message MOB_HO-IND MAC to transmit the correlated information with a normal transfer termination to the BS. The service BS receives the message MO_HO-IND MAC from the MSS at the end of a MAC state assigned by machine to the MSS. The service BS also terminates an ARQ (Automatic Repeat Request) connection. and all connections associated with data transmission. and. HO rejection In rejecting HO, the MSS may reject a transfer recommended by the BS. When rejecting a transfer, the MSS establishes a specific field (HO_Type = 10) of the MOB HO-IND MAC message and transmits the message to the BS. The BS receives the reject message of the MSS, searches again for a blank BS and retransmits the message MOB_BSHO-RSP MAC to the MSS. 3. BS Neighbor Scanning Procedure Figure 4 is a diagram illustrating a neighboring base station scanning procedure of related art.

With reference to Figure 4, a service BS connected to an MSS broadcasts information pertaining to neighboring BSs to all MSSs within a BS domain. The information that belongs to the neighboring BSs is supplied through a message MOB-NBR-ADV. A configuration of the message MOB-NBR-ADV is shown in the Table 1. [Table 1] With reference to Table 1, the message MOB-NBR-ADV includes a number of neighboring BSs, a neighbor identifier BS, a frequency of neighboring BSs, a channel information of neighboring BSs, and other information. After the MSS has received the message MOB-NBR-ADV, the MSS temporarily suspends the reception of data transmitted from the service BS and transmits a message MOB-SCN-REQ to acquire a time for channel quality measurement to from the neighboring BS to the BS. A configuration of the MOB-SCN-REQ message is based on Table 2. [Table 2] While the MSS measures the channel qualities of the neighboring BSs, the service BS suspends the transmission of data to the MSS and can then transmit data after receipt of a request for scanning duration of an MSS. The service BS transmits a MOB-SCN-RSP message to the MSS in response to the message MOB_SCN-REQ. A configuration of the message MOB-SCN-REQ is shown in Table 3. [Table 3] As shown in the message MOB-SCN-REQ, the BS ensures the scan duration requested by the MSS, and the MSS starts the scanning of the BS after having been in standby for a time of the start box. The method of scanning neighboring BSs of related art has several problems and disadvantages. In order to exercise a regular service from the 'BS, an MSS in movement can request the transfer. Alternatively, the BS may request the transfer in order to balance its load. If the BS requests the transfer, the MSS scans neighboring BSs to determine whether the transfer is made or not. If the transfer is required, neighboring BSs must be continuously scanned. However, in order to obtain channel quality information in the method of the related art, the MSS must transmit the scan request message and receive the corresponding scan response message each time. Consequently, the MSS continuously occupies limited radio resources and unnecessarily consumes energy for transmission and reception of messages. DISCLOSURE OF THE INVENTION Accordingly, the present invention focuses on scanning neighboring base stations in a wireless access system that substantially avoids one or more of the problems of the related art. An object of the present invention is to provide a method of scanning neighboring BSs wherein a mobile subscriber station (MSS) efficiently measures the quality of a physical channel that is required for the transfer and transmits a corresponding result to a base station ( BS). Advantages, objects and additional features of the invention will be presented in part in the following description and in part will be apparent to persons of ordinary skill in the art upon examination of the following or may be learned from the practice of the invention. The objects and other advantages of the invention can be achieved and achieved through the structure particularly indicated in the description described and in the claims as well as in the accompanying drawings. To achieve these objectives and other advantages and in accordance with the object of the present invention, in accordance with what is incorporated and described in general terms here, in one embodiment, a method of scanning neighboring base stations to evaluate the channel quality in a wireless communication system includes receiving from an information service base station associated with at least one neighboring base station, and transmitting a request for scanning message from the mobile subscriber station to the base station of service, wherein the scan request message comprises a requested scan duration and a requested scan iteration, the requested scan iteration is related to a requested number of scan iterations of the at least one neighboring base station. The method also includes receiving a scan response message from the service base station, wherein the message from The scan response comprises a permitted scan duration and an allowed scan iteration, the allowed scan iteration is related to a permitted number of scan iterations of the at least one neighboring base station. The scan request message may preferably comprise a required interleaving interval associated with a time lapse required between each scan. In addition, the scanning response message may preferably further comprise a permitted interleaving interval associated with a permitted lapse of time between each scan. During each of the allowed interleaving intervals, the service base station and the mobile subscription station may preferably be in normal operation mode. If the mobile transmitter station transmits data to the service base station during the allowed scan time, then the scanning of the- at least one neighboring base station can preferably be terminated. The preferred scanning duration may preferably be associated with a required time lapse wherein the mobile subscriber station initiates and terminates the scanning of the at least one neighboring base station. The allowed scan duration can preferably be associated with a permitted time lapse wherein the mobile subscriber station initiates and terminates the scanning of the at least one station of neighboring base. The scan response message from the service base station may further comprise a scan reporting mode, wherein the scan reporting mode is associated with a report frequency from the mobile subscriber station to the base station of service .. The scan reporting mode may preferably comprise at least one of the following: (1) no report (2) periodic report, and (3) report activated by event. The mobile subscriber station may preferably transmit a scan report to the service base station in response to the scan reporting mode. The allowed scan duration and the allowed scan iteration can preferably be determined through the service base station in response to the requested scan duration and the requested scan iteration and a network load. In another embodiment, a scanning method of neighboring base stations for evaluating channel quality in a wireless communication system includes receiving from a base station in information service associated with at least one neighboring base station, and receiving a scan response message from the service base station, wherein the scan response message comprises a scan duration and a scan iteration, the scan iteration is related to a number of scan iterations of the at least one neighboring base station. In another embodiment, a scanning method of neighboring base stations for evaluating the channel quality in a wireless communication system includes the transmission to a mobile subscriber station of information associated with at least one neighboring base station, and the transmission of a scan response message from the service base station, where the scan response message comprises a permitted scan duration and an allowed scan iteration, the allowed scan iteration is related to a permitted number of iterations of the scanning of the at least one neighboring base station. The method may also preferably include receiving a scan request message from a mobile subscriber station to the service base station before transmitting the scan response message, wherein the scan request message comprises a Required scan duration and a required scan iteration, the required scan iteration is related to a required number of iterations scanning of the at least one neighboring base station. It will be understood that both the above general description and the following detailed description of the present invention they are examples and explanations and are contemplated to provide additional information of the claimed invention. The above objects, features, aspects and advantages of the present invention will be more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings. It will be understood that the above general description as the following detailed description of the present invention are examples and explanations and are contemplated to provide a further explanation of the claimed invention. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings that are included to provide further understanding of the invention and are incorporated in this application and form part of said application illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. Figure 1 is a block diagram illustrating a broadband wireless access system in which a transfer operation is performed in a data plane. Figure 2 is a block diagram illustrating a broadband wireless access system wherein the transfer operation is carried out in a control plane. Figure 3 is a diagram illustrating a cell selection procedure in a broadband wireless access system.

Figure 4 is a diagram illusing a neighboring base station scanning procedure. Figure 5 is a diagram illusing a neighboring base station scanning procedure, in accordance with one embodiment of the present invention. PREFERRED MODE OF THE INVENTION Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illused in the accompanying drawings. When possible, the same reference numbers will be used in all drawings to refer to the same or similar parts. In one embodiment, a request to perform a scan for channel quality measurement (scan request message) from neighboring base stations is sent to a service base station (BS). A mobile subscriber station (MSS) smits a cycle and an iteration account to perform scanning (scanning) to the service BS to allow periodic scanning. In periodic scanning of neighboring BSs, the cycle for scanning may correspond to a time between scanning execution intervals. The time between scanning execution intervals can be, for example, a general interleaving interval for smitting data between the MSS and the service BS. The cycle to perform the scan is called an operation interval normal (interleaving interval). During the normal operating interval, the MSS and the service BS can communicate fic data. The information pertaining to channel quality (channel quality information) measured by the MSS may include a signal-to-interference plus noise (SINR) relationship of a neighboring BS, a bit error frequency, a service identifier quality , and other information. An example configuration of a scan request message (scan request message) is shown in Table 4. [Table 4] Syntax Size Notes MOB_SCN_REQ_Message_format (). { Type of 8-bit Message Handling = 50 Scan duration 12 bits Units are frames Interleaving interval X bits Iteration of Scanning AND bits} With reference to Table 4, the MSS smits information for execution of periodic scanning to the service BS using a scan request message. The scan request message may include information that is referred to to the magnitude of the scan duration (scan duration), the time to start the scan (start box), an iterated scan count (scan iteration), and a general function execution interval (Interleaving interval). In response to receipt of a scan request message, the service BS smits a scan response message to the MSS. An example configuration of the scan response message is shown in Table 5. [Table 5] Syntax Size Notes MOB_SCN_RSP_Message_format (). { Type of 8-bit Message Handling = 50 Scan duration. 12 bits Units are pictures Startup frame 4 bits Interleaving interval X bits Iteration of Scanning AND bits} With reference to Table 5, the service BS smits the scan response message to the MS in response to receipt of the scan request message. The scan response message may include information that refers to the magnitude of a scan duration (duration of scan), the time to start scanning (start box), an iterated scan count (scan iteration), and a general function execution interval (interleaving interval). The MSS periodically measures the channel quality of the neighboring BSs based on the information included in the scan response message smitted from the service BS. In another modality, the information that refers to the magnitude of a scan duration (scan duration), the time to start the scan (start box), the iterated scan count (scan iteration), and the execution interval General function (interleaving interval) is smitted by the BS to the MSS in response to the request from the MSS. Alternatively, the information that refers to the magnitude of a scan duration (scan duration), time to start the scan (start box), iterated scan count (scan iteration), and the general function execution interval ( interleaving interval) can be transmitted by service BS to the MSS without request by the MSS (unsolicited response). Figure 5 is a diagram illustrating a neighboring base station scanning procedure in accordance with one embodiment of the present invention. With reference to Figure 5, in one embodiment, a first BS (service BS) 520 may preferably store the data instead of transmitting the data to an MSS 510 during a scanning period (scan duration), such as the scanning durations related to the first, second and third iteration intervals 555, 565, and 575 , respectively, wherein the MSS 510 is measuring the channel quality of neighboring BSs (white BSs), ie the second BS 530 and the third BS 540. The serving BS 520 can then transmit the stored data during a time slot in the which the MSS 510 is not scanning the neighboring BSs 530 and 540, that is, during a range of. execution of .general function (interleaving interval). In another embodiment, if a data transmission time is prolonged in such a way that the data transmission is not complete by a new scan start time (start box) of the MSS 510, the service BS 520 may ignore the start time of scanning and continue transmitting the data. Alternatively, the data transmission can be stopped to allow the new scan start time. In such cases, when the data transmission is stopped, the data transmission may be restarted after the end of the scanning duration of the MSS 510. In another embodiment, if the service BS 520 ignores the scan start time of the the MSS 510 and continues transmitting the data, the MSS 510 can stop the scan in response to a determination by the MSS 510 in the sense that the scan duration, the general function execution interval (interleaving interval), and the scan iteration count assigned by the service BS 520 through the response message Scanning are no longer valid. Also, in such a case, when the service BS 520 ignores the scan start time of the MSS 510 and continues transmitting the data, scan data and procedures received from the service BS 520 that is relate to an iteration count that has not been executed can then be executed. Alternatively, the MSS 510 can continue to scan during data transmission from the service BS 520, thereby enabling the MSS 510 to perform scanning throughout the scan period (scanning duration X scan iteration) initially assigned by the Service BS 520. In another embodiment, service BS 520 may employ a result of a neighboring BS (white) channel quality measurement acquired from scanning by the MSS 510 to determine whether or not instructions are given to execute transfer to the MSS 510. In this case, the service BS 520 may request the measurement of the neighboring BS channel quality from the MSS 510 to determine whether it is necessary to effect the transfer. The service BS 520 may also request the execution of the transfer to the MSS 510 for adjusting the network load of the service BS 520. In another embodiment, the channel quality measurement request from the service BS 520 to the MSS 510 can be initiated based on the need for the service BS 520. In this case, the MSS 510 transmits the result of a neighboring BS channel quality measurement (channel quality measurement result) to the requesting BS (service) 520. For example, the MSS 510 may preferably send parameters which include requested scan iteration, interleaving interval, and scan duration to the service base station 520. Service BS 520 can use these received parameters in combination with the programming capabilities and data buffer of the BS of service 520. Alternatively, the service BS 520. Alternatively, the service BS 520 may change the parameters. The transmission of the channel quality measurement result can be effected by the periodic report of the channel quality measurement result regardless of the time point or cycle of the measurement. Alternatively, the result of channel quality measurement can be reported each time the MSS 510 measures the channel qualities. The measurement reporting method of the MSS 510 can be selected by the service BS 520 or the MSS 510. An example of the response report configuration of the Scanning that includes the information that relates to the selection is shown in Table 6. [Table 6] The MSS can preferably report the result of channel quality measurement in accordance with an identifier of the scan response message received from the service BS in each measurement. Alternatively, the MSS may preferably report the channel quality measurement result in accordance with an identifier of the scan response message received from the service BS periodically. In the case of reporting the channel measurement quality result periodically, a separate measurement result reporting period can be established. Alternatively, the MSS may not report the channel quality measurement result. In one embodiment, the MSS is not required to send a confirmation message in response to receipt of the scan response message from the service BS. For example, if the MSS performs an action different from the action requested by the service BS, the service BS may determine that the scan response message is incorrect and send another scan response message. When a message is received requesting a new scan and report from the white BS while the white BS is in the process of reporting a scan result to the service BS, the MSS may ignore all the scanning and reporting procedures current and can perform a scanning and reporting procedure in accordance with the new request message. A scan duration and periodically repeated interleaving intervals that allow the transmission and / or reception of data may be interrupted by a request from the service BS. When the service BS requests an interruption of this type, the service BS may fill a specific entry (scan duration, interleaving intervals, scan iteration) in the scan response message shown in table 5 with a specific value , for example, 0, for notification purposes. In addition, scan duration and repeated interleaving intervals that allow the transmission and / or reception of data may be interrupted by a request from the MSS. When the MSS requests such an interruption, the MSS can fill a specific entry (scan duration, interleaving interval, scan iteration) in the scan request message shown in Table 4 with a specific value, for example, zero for Notification In one embodiment, a scanning method of neighboring base stations for evaluating channel quality in a wireless communication system includes receiving from an information service base station associated with at least one neighboring base station and the transmission of a scan request message from a station of mobile subscriber to the service base station, wherein the scan request message comprises a requested scan duration and a requested scan iteration, the requested scan iteration is related to a number of requested iterations of the scan of the at least a neighboring base station. The method also includes receiving a scan response message from the service base station, wherein the scan response message comprises a permitted scan duration and a permitted scan iteration, the allowed scan iteration is associated with a permitted number of iterations of the scanning of the at least one neighboring base station. In addition, the scanning request message preferably further comprises a requested interleaving interval associated with a requested period of time between each scan. In addition, the scan response message may preferably further comprise a permitted interleaving interval associated with a permitted period of time between each scan. During each of the allowed interleaving intervals, the service base station and the mobile subscriber station may preferably be in a normal operating mode. If the mobile subscriber station transmits data to the service base station during the scanning period allowed, then the scanning of the at least one neighboring base station may preferably be terminated. The requested scan duration may preferably be associated with a requested period of time in which the mobile subscriber station initiates and terminates the scanning of the at least one neighboring base station. The allowed scan duration may preferably be associated with a permitted period of time wherein the mobile subscriber station initiates and terminates the scanning of the at least one neighboring base station. The scan response message from the service base station may further comprise a scan reporting mode, wherein the scan reporting mode is associated with a reporting frequency from the mobile subscriber station to the base station of service. The scan reporting mode may preferably comprise at least one of the following: (1) no report, (2) periodic report, and (3) report triggered by event. The mobile subscriber station may preferably transmit a scan report to the service base station in response to the scan reporting mode. The allowed scan duration and the allowed scan iteration can preferably be determined by the service base station in response to the requested scan duration and the required scan iteration and a network load. In another embodiment, a scanning method of neighboring base stations for evaluating channel quality in a wireless communication system includes receiving from an information service base station associated with the at least one neighboring base station, and receiving a scan response message from the service base station, wherein the scan response message comprises a scan duration and a scan iteration, the scan iteration is related to a number of iterations of the scanning of the at least one neighboring base station. In another embodiment, a scanning method of neighboring base stations for evaluating the channel quality in a wireless communication system includes the transmission to a mobile subscriber station of information associated with at least one neighboring base station, and the transmission of a scan response message from a service base station, wherein the scan response message comprises a permitted scan duration and an allowed scan and iteration, the allowed scan iteration is associated with a permitted number of iterations of the scanning of the at least one neighboring base station. The method may also preferably include the reception of a scan request message from a radio station. mobile subscriber to the service base station before transmitting the scan response message, wherein the scan request message comprises a requested scan duration and a requested scan iteration, the requested scan iteration is related to a number requested from scan iterations of the at least one neighboring base station. Accordingly, the MSS performs scanning of neighboring BSs in a wireless access system without repeatedly transmitting or receiving the scan or response request messages. It will be apparent to those skilled in the art that various modifications and variations may be made to the present invention without departing from the spirit or scope of the invention. Thus, it is contemplated that the present invention encompass the modifications and variations of this invention provided they are within the scope of the appended claims and their equivalents. INDUSTRIAL EXPLOITATION The present invention can be applied to a broadband wireless access system.

Claims (1)

1. CLAIMS A method for scanning neighboring base stations to evaluate the channel quality in a wireless communication system, the method comprising: receiving from a service base station information associated with at least one neighboring base station; transmitting a scan request message from a mobile subscriber station to the service base station, wherein the scan request message comprises a required scan duration and a required scan iteration, the required scan iteration is related to a required number of scan iterations of the at least one neighboring base station; And receiving a scan response message from the service base station, wherein the scan response message comprises a permitted scan duration and an allowed scan iteration, the allowed scan iteration is associated with a permitted number of iterations of the scanning of the at least one neighboring base station. The method according to claim 1, wherein the scan request message comprises in addition a required interleaving interval associated with a period of time required between each scan. The method according to claim 1, wherein the scan response message further comprises a permitted interleaving interval associated with a permitted period of time between each scan. The method according to claim 3, wherein during each allowed interleaving interval, the service base station and the mobile subscriber station are in a normal operating mode. The method according to claim 1, wherein if the mobile subscriber station transmits data to the service base station during the allowed scanning period, then the scanning of the at least one neighboring base station is terminated. The method according to claim 1, wherein the required scan duration is associated with a required period of time wherein the mobile subscriber station initiates and terminates the scanning of the at least one neighboring base station. The method according to claim 1, wherein the allowed scan duration is associated with a permitted period of time wherein the mobile subscriber station initiates and terminates the scanning of the at least one neighboring base station. The method according to claim 1, wherein the scan response message from the service base station further comprises a scan reporting mode, wherein the scan reporting mode is associated with a reporting frequency of the mobile subscriber station to the service base station. The method according to claim 8, wherein the scan report mode comprises one of the following: (1) no report, (2) periodic report, and (3) report triggered by event. The method according to claim 1, wherein the mobile subscriber station transmits a scan report to the service base station in response to the scan reporting mode. The method according to claim 1, wherein the allowed scan duration and the allowed scan iteration are determined by the service base station in response to the required scan duration and the required scan iteration and a network load. . A method for scanning neighboring base stations to evaluate the channel quality in a wireless communication system, the method comprises: receiving from a service base station information associated with at least one neighboring base station; and receiving a scan response message from the service base station, wherein the scan response message comprises a scan duration and a scan iteration, the scan iteration is associated with a number of iterations of the scan of the at least one neighboring base station. The method according to claim 12, wherein the scan response message further comprises an interleaving interval associated with a period of time between each scan. The method according to claim 13, wherein during each of the interleaving intervals, the service base station is in a normal operating mode. The method according to claim 12, wherein the scan duration is associated with a period of time in which the service base station initiates and terminates the scanning of the at least one neighboring base station. The method according to claim 12, wherein the scan response message from the service base station further comprises a scan reporting mode, wherein the reporting mode Scanning is associated with a reporting frequency. The method according to claim 16, wherein the scan reporting mode comprises one of the following: (1) no report, (2) periodic report, and (3) report triggered by event. A method for scanning neighboring base stations for evaluating channel quality a wireless communication system, the method comprising: transmitting to a mobile subscriber station information associated with at least one neighboring base station; and transmitting a scan response message from a service base station, wherein the scan response message comprises a permitted scan duration and an allowed scan iteration, the allowed scan iteration is associated with a permitted number of scan iterations of the at least one neighboring base station The method according to claim 18, further comprising: receiving a scan request message from a mobile subscriber station to the service base station before of transmitting the scan response message, wherein the scan request message comprises a required scan duration and a Required scan iteration, the required scan iteration is associated with a required number of scan iterations of the at least one neighboring base station. The method according to claim 19, wherein the scan request message further comprises a required interleaving interval associated with a period of time between each scan. The method according to claim 19, wherein the scan response message further comprises a permitted interleaving interval associated with a period of time between each scan. 22. The method according to claim 21, wherein during each of the allowed interleaving intervals the service base station and the mobile subscriber station are in a normal operating mode. The method according to claim 19, wherein if the mobile subscriber station transmits data to the service base station during the allowed scanning period, then the scanning of the at least one neighboring base station ends. The method according to claim 18, wherein the required scan duration is associated with a period of time wherein the subscriber station mobile starts and ends the scanning of the at least one neighboring base station. 25. The method according to claim 18, wherein the allowed scan duration is associated with a period of time in which the mobile subscriber station initiates and terminates the scanning of the at least one neighboring base station. The method according to claim 18, wherein the scan response message from the service base station further comprises a scan reporting mode, wherein the scan reporting mode is associated with a frequency of report from the mobile subscriber station to the service base station. 27. The method according to claim 28, wherein the scan reporting mode comprises one of the following: (1) no report, (2) periodic report, and (3) report triggered by event. 28. The method according to claim 26, wherein the mobile subscriber station transmits a scan report to the service base station in response to the scan reporting mode. 29. The method according to claim 18, wherein the allowed scan duration and the allowed scan iteration are determined by the scanning station. service base in response to the required scan duration and the required scan iteration and network load. . A mobile subscriber station configured to scan neighboring base stations to evaluate the channel quality in a wireless communication system, the mobile subscriber station comprises: means for receiving from a service base station the information associated with at least a neighboring base station; means for transmitting a scan request message from the mobile subscriber station to a service base station, wherein the scan request message comprises a required scan duration and a required scan iteration, the required scan iteration it is associated with a required number of iterations of the scanning of the at least one neighboring base station; and means for receiving a scan response message from the service base station, wherein the scan response message comprises a permitted scan duration and an allowed scan iteration, the allowed scan iteration is associated with a allowed number of scan iterations of the at least one neighboring base station. The mobile subscriber station according to claim 30, wherein the scan request message further comprises a required interleaving interval associated with a required period of time between each scan. The mobile subscriber station according to claim 30, wherein the scan response message further comprises a permitted interleaving interval associated with a required period of time between each scan. The mobile subscriber station according to claim 30, wherein the required scan duration is associated with a permitted period of time wherein the mobile subscriber station initiates and terminates the scanning of the at least one neighboring base station. . The mobile subscriber station according to claim 30, wherein the allowed scan duration is associated with a permitted period of time wherein the mobile subscriber station initiates and terminates the scanning of the at least one neighboring base station. . The mobile subscriber station according to claim 30, wherein the scan response message from the base station of The service further comprises a scan reporting mode, wherein the scan reporting mode is associated with a reporting frequency from the mobile subscriber station to the service base station. 36. The mobile subscriber station according to claim 35, wherein the scan reporting mode comprises one of the following: (1) no report, (2) periodic report, and (3) report activated by event . 37. A mobile subscriber station configured to scan neighboring base stations to evaluate the channel quality in a wireless communication system, the mobile subscriber station comprising: means for receiving from a service base station the information associated with at least one neighboring base station; means for receiving a scan response message from the service base station, wherein the scan response message comprises a scan duration and a scan iteration, the scan iteration is. associates with a number of iterations of the scanning of the at least one neighboring base station. 38. The mobile subscriber station according to claim 37, wherein the reply message The scanner further comprises an interleaving interval associated with a period of time between each scan. 39. The mobile subscriber station according to claim 37, wherein the scanning duration is associated with a period of time in which the mobile subscriber station initiates and terminates the scanning of the at least one neighboring base station. 40. The mobile subscriber station according to claim 37, wherein the scan response message from the service base station further comprises a scan reporting mode, wherein the scan reporting mode is associated with a report frequency from the mobile subscriber station to the service base station. 41. The mobile subscriber station according to claim 40, wherein the scan reporting mode comprises one of the following: (1) no report, (2) periodic report and (3) report triggered by event. 42. A base station configured to scan neighboring base stations to evaluate the channel quality in a wireless communication system, the base station comprises: means for transmitting to a mobile subscriber station the information associated with at least one radio station. neighboring base; and means for transmitting a scan response message from a service base station, wherein the scan response message comprises a permitted scan duration and an allowed scan iteration, the allowed scan iteration is associated with a allowed number of scan iterations of the at least one neighboring base station. 43. The base station according to claim 42, further comprising means for receiving a scan request message from a mobile subscriber station to the service base station before transmitting the scan response message, wherein the scan request message comprises a scan duration required and a required scan iteration, the required scan iteration is associated with a required number of scan iterations of the at least one neighboring base station. 44. The base station according to claim 43, wherein the scan request message further comprises a required interleaving interval associated with a period of time between each scan. 45. The base station in accordance with the claim 43, wherein the scan response message further comprises a permitted interleaving interval associated with a period of time between each scan. 46. The base station according to claim 42, wherein the required scan duration is associated with a period of time in which the mobile subscriber station initiates and terminates scanning of the at least one neighboring base station. 47. The base station according to claim 42, wherein the allowed scan duration is associated with a period of time in which the mobile subscriber station initiates and terminates scanning of the at least one neighboring base station. 48. The base station according to claim 42, wherein the scan response message from the service base station further comprises a scan reporting mode, wherein the scan reporting mode is associated with a Reporting frequency of the mobile subscriber station to the service base station. 49. The base station according to claim 48, wherein the scan reporting mode comprises one of the following: (1) no report, (2) periodic report, and (3) report activated by event. 10 15 20 25