KR20080034263A - Apparatus and method for scanning in a multi-hop relay broadband wireless access communication system - Google Patents

Abstract

An apparatus and a method for scanning in a broadband wireless access communication system using multi-hop relay are provided to provides the same service and function between an MSS(Mobile Subscriber Station) and a BS(Base Station), reduce a difference between systems that may be caused by dual signaling between an RS(Relay Station) and the MSS and between the RS and the BS, and match synchronization of a system operation. A message processing unit(811) processes a scan request message received from an MSS. A message generating unit(813) generates a scan response message corresponding to a scan command message including a scanning guide from a BS. An interface module(821) transmits the message from the message generating unit via an antenna. The scanning guide is one of a terminal scan refusal, a terminal scan instruction, and a terminal scan notification. If the scanning guide is the terminal scan instruction, a scan command message including information about a scan schedule and a scan result report required for the MSS is received. If the scanning guide is the terminal scan refusal, a scan section is set as zero and a scan response message is transmitted to the MSS. A control unit(819) provides the message processing unit with a control message received from the MSS or the BS. In addition, the control unit receives a message which is supposed to be transmitted to the MSS or the BS, and then transmits the message to the interface module.

Description

Apparatus and method for scanning in a broadband wireless access communication system using a multi-hop relay method {APPARATUS AND METHOD FOR SCANNING IN A MULTI-HOP RELAY BROADBAND WIRELESS ACCESS COMMUNICATION SYSTEM}

1 is a diagram schematically showing the structure of a general IEEE 802.16e communication system.

2 is a diagram illustrating a signaling procedure between a terminal and a base station for performing a scanning operation in a broadband wireless access communication system according to the prior art.

3 is a diagram schematically illustrating a structure of a broadband wireless communication system using a multi-hop relay scheme according to the present invention.

FIG. 4 is a flowchart illustrating an operation procedure of a relay station performing a base station indication for terminal request scanning in a broadband wireless communication system using a multi-hop relay scheme according to an embodiment of the present invention.

FIG. 5 is a flowchart illustrating an operation procedure of a base station instructing a relay station about scanning of a terminal request in a broadband wireless communication system using a multi-hop relay scheme according to an exemplary embodiment of the present invention.

6 is a diagram illustrating an operation procedure of a base station instructing a relay station to scan a base station request in a broadband wireless communication system using a multi-hop relay scheme according to an embodiment of the present invention.

7 is a flowchart illustrating an operation procedure of a relay station performing base station indication on base station request scanning in a broadband wireless communication system using a multi-hop relay scheme according to an embodiment of the present invention.

8 is a block diagram of a relay station (or base station) according to an embodiment of the present invention.

The present invention relates to a broadband wireless access communication system using a multi-hop relay method, and more particularly, to an apparatus and method for supporting a scanning of a terminal by a relay station according to an instruction of a base station in a broadband wireless access communication system using a multi-hop relay method. It is about.

In the 4th Generation (hereinafter, referred to as '4G') communication system, users of services having various quality of service (hereinafter referred to as 'QoS') having a transmission rate of about 100 Mbps are used. Active research is underway to provide them. In particular, in 4G communication systems, broadband wireless such as a wireless local area network (hereinafter, referred to as a 'LAN') system and a wireless metropolitan area network (hereinafter, referred to as a 'MAN') system are used. Research is being actively conducted to support high-speed services in a form of guaranteeing mobility and quality of service (BoS) in a broadband wireless access (BWA) communication system. (Institute of Electrical and Electronics Engineers) 802.16a communication system and IEEE 802.16e communication system.

The IEEE 802.16a communication system and the IEEE 802.16e communication system are orthogonal frequency division multiplexing (OFDM) for supporting a broadband transmission network on a physical channel of the wireless MAN system. Or OFDM) orthogonal frequency division multiple access (OFDMA) scheme. The IEEE 802.16a communication system is a system currently considering only a single cell structure and a state in which a subscriber station (SS) (hereinafter referred to as SS) is fixed, that is, no consideration of mobility of the SS is considered. . In contrast, the IEEE 802.16e communication system is a system considering the mobility of the SS in the IEEE 802.16a communication system, and the SS having the mobility is referred to as a mobile subscriber station (MSS). It will be called.

1 is a diagram schematically illustrating a structure of a general IEEE 802.16e communication system.

Referring to FIG. 1, the IEEE 802.16e communication system has a multi-cell structure, that is, a base station (BS) 110 having a cell 100 and a cell 150 and managing the cell 100. And a base station 140 that manages the cell 150 and a plurality of MSSs 111, 113, 130, 151, and 153. Signal transmission and reception between the base stations 110 and 140 and the MSSs 111, 113, 130, 151 and 153 is performed using the OFDM / OFDMA scheme. However, among the MSSs 111, 113, 130, 151, and 153, the MSS 130 exists in a boundary region of the cell 100 and the cell 150, that is, a handover region. That is, when the MSS 130 moves to the cell 150 managed by the base station 140 while transmitting and receiving a signal with the base station 110, the serving BS is transferred from the base station 110. The base station 140 is changed.

2 illustrates a signaling procedure between an MSS and a base station for performing a scanning operation in a broadband wireless access communication system according to the prior art.

Referring to FIG. 2, the MSS 210 first communicates with the serving base station 230 in step 211. As such, during communication with the serving base station 230, the MSS 210 determines whether scanning for neighboring base stations and pilot channel signals transmitted from the serving base station 230 is required. If it is determined that scanning is necessary, the MSS 210 sends a mobile subscriber station scan request (MOB_SCN-REQ) to the serving base station 230 (MOB_SCN-REQ) in step 213. Send a message. The MOB_SCN-REQ message structure is as shown in Table 1 below.

Syntax Size (bits) Notes MOB_SCN-REQ_format () {   Management Message Type = 54 8 -   Scan duration 8 units are in frames   Interleaving interval 8 units are frames   Scan iteration 8 in frames   N_Recommended_BS 8 Number of neighboring BS to be scanned   for (i = 0; i <N_Recommended_BS; i ++) {     Recommended BS_ID 48 BS Identifier   } }

As shown in Table 1, the MOB_SCN-REQ message includes a plurality of Information Element (IE), that is, a "Management Message Type" indicating the type of message to be transmitted, and scanning of pilot signals transmitted from the neighbor base stations. "Scan duration" representing the desired scan interval, "Scan Iteration" representing the number of scanning if the scanning operation is repeated periodically, "Interleaving interval" representing the time interval between each scanning operation if the scanning operation is repeated, and scanning &Quot; Recommended_BS_ID " representing each base station to be desired.

On the other hand, the serving base station 230 receiving the MOB_SCN-REQ message includes the scanning information for the MSS 210 in step 215, and the mobile subscriber station scan response (MOB_SCN-RSP: Mobile Scanning) where the scanning interval is not 0 Interval Allocation Response, hereinafter referred to as 'MOB_SCN-RSP' message, is transmitted to the MSS 210.

Here, the MOB_SCN-RSP message structure is as shown in Table 2 below.

Syntax Size (bits) Notes MOB_SCN-RSP_format () {   Management Message Type = 55 8 -   Scan duration 8 units are in frames. When Scan duration is set to zero, no scanning parameters are specified in the message. When MOB_SCN-RSP is sent in response to MOB_SCN-REQ, setting Scan duration to zero denies MOB_SCN-REQ.   Report mode 2 0b00: no report 0b01: periodic report 0b10: event triggered report 0b11: reserved; shall be set to zero   reserved 6 shall be set to zero   Report period 8 Available when the value of Report mode is set to 0b01. Report period in frames.   Report metric 8 Bitmap indicating metrics on which the corresponding triggers are based: Bit 0: BS CINR mean Bit 1: BS RSSI mean Bit 2: Relative delay Bit 3: BS RTD BIt 4-7: reserved; shall be set to zero   if (Scan duration! = 0) {     Start frame 4 -     reserved 4 shall be set to zero     Interleaving interval 8 duration in frames     Scan iteration 8 -     N_Recommended_BS 8 Number of neighboring BS to be scanned     for (i = 0; i <N_Recommended_BS; i ++) {       Recommended BS_ID 48 BS Identifier     }   } }

As shown in Table 2, the MOB_SCN-RSP message includes a plurality of IEs, that is, a message type (Management Message Type) transmitted, a scan duration in which the MSS performs scanning, and a scan result reporting method. (report mode), the scan report period to be applied when the scan result reporting method is the periodic result report, the information to be reported as the scan result (report metric), and the start point of the scan operation (start frame) ), A scan iteration when performing periodic scanning, an interleaving interval between every scan, and each base station information (Recommended BS_ID) to perform scanning. The scan interval, when the value is 0, indicates that the scanning request of the MSS has been rejected. The information to be reported as the scan result is received signal strength indicator (RSSI), delay (in addition to the carrier to interference and noise ratio (CINR). relative delay), round trip delay (RTD), and the like.

Upon receiving the MOB_SCN-RSP message including the scanning information, the MSS 210 receives a pilot channel corresponding to the parameters included in the MOB_SCN-RSP message for neighboring base stations and the serving base station 230 in step 217. Scan the signals.

Meanwhile, the serving base station 230 stops data transmission to the MSS 210 while the MSS 210 performs scanning corresponding to the parameters included in the MOB_SCN-RSP message in step 219. Buffer the data for 210.

After the scanning of the pilot channel signals received from the neighbor base stations and the serving base station 230 is completed, the MSS 210 reports the mobile subscriber station scan (MOB_SCN-REP: Mobile Scanning Result Report) to inform the scan result in step 221. In the following description, a &quot; MOB_SCN-REP &quot; message is transmitted to the serving base station 230.

The MOB_SCN-REP message structure is as shown in Table 3 below.

Syntax Size (bits) Notes MOB_SCN-REP_format () {   Management Message Type = 60 8 -   Report mode One 0: Event-triggered report 1: Periodic report   reserved 7 shall be set to zero   Report Metric 8 Bitmap indicating presence of certain metrics: Bit 0: BS CINR mean Bit 1: BS RSSI mean Bit 2: Relative delay Bit 3: BS RTD Bit 4-7: reserved; shall be set to zero   N_BS 8 Number of BS to be scanned   for (i = 0; i <N_BS; i ++) {     BS_ID 48 BS Identifier     Scanning result 8 this field contains the scanning result corresponding to Report metric (CIRN / RSSI / Relative delay / RTD / etc.)   } }

As shown in Table 3, the MOB_SCN-REP message is reported by a plurality of IEs, that is, a message type (Management Message Type) transmitted, a method in which the MSS reports a scanning result, and a scan result. Information to be reported (Report Metric), each base station information (BS_ID) that the MSS has performed scanning, and scanning result information (Scanning result) for each base station. The scan result information is included in the MOB_SCN-REP message according to whether there is information to be reported as the scan result, and the scan result information includes RSSI (Received Signal Strength Indication) and delay in addition to a carrier to interference and noise ratio (CINR). (relative delay) and round trip delay (RTD).

In the general IEEE 802.16e communication system, signaling is transmitted and received through a direct link between the fixed base station and the MSS, as shown in FIG. However, in the IEEE 802.16e communication system, since the location of the base station is fixed, the flexibility of the wireless network configuration is low, and thus, it is difficult to provide an efficient communication service in a wireless environment in which the traffic distribution and the call demand change are severe.

In order to overcome this drawback, a multi-hop relay data transfer scheme can be applied to a general cellular wireless communication system such as the 802.16e communication system using a fixed relay station, a mobile relay station, or general MSS. have. Therefore, the wireless communication system using the multi-hop relay method can quickly reconfigure the network in response to changes in the communication environment, it is possible to operate the entire wireless network more efficiently. A wireless communication system using the multi-hop relay scheme can expand a cell service area and increase system capacity. That is, when the channel state between the base station and the MSS is poor, a relay station may be installed between the base station and the MSS to configure a multi-hop relay path through the relay station, thereby providing the MSS with a better channel state. In addition, by using the multi-hop relay scheme in a cell boundary region having a poor channel state from a base station, it is possible to provide a faster data channel and expand a cell service area.

3 is a diagram schematically illustrating a structure of a wireless communication system using a multi-hop relay scheme.

Referring to FIG. 3, the multi-hop relay wireless communication system provides a base station 310 and a plurality of MSSs 311, 313, 331, and 333, and a multi-hop relay path between the base station and the MSS. It is composed of a relay station (Relay Station) (320). Signal transmission and reception between the base station 310 and the relay station 320 and the MSSs 311, 313, 331, and 333 is performed using the OFDM / OFDMA scheme. The base station 310 manages the cell 300, and the MSSs 311 and 313 and the relay station 320 included in the cell 300 area may directly transmit and receive a signal with the base station 310. However, MSSs 331 and 333 present in the area 330 outside the cell 300 may not directly transmit / receive signals with the base station 310. Accordingly, the relay station 320 manages the area 330 and relays a signal between the base station 310 and the MSSs 331 and 333, which cannot directly transmit and receive a signal as described above, and the MSSs 331 and 333 A signal may be transmitted and received with the base station 310 through the relay station 320.

In the wireless communication system using the multi-hop relay method through the relay station as described above, the MSS may communicate with the base station through the relay station or establish a direct link with the base station. Therefore, even in a wireless communication system using a multi-hop relay method, the services and functions provided in the existing wireless communication system should be equally applied.

Typically, in the case of a broadband wireless access communication system using a multi-hop relay method, the target of communication in the MSS is extended to the base station and the repeater, so that the MSS includes not only the neighbor base stations but also the neighboring relay stations in scanning for smooth communication. You have to. In addition, the repeater needs to define a signaling procedure for processing scan control signals exchanged between the MSS and the base station in order to support the scanning of the MSS, and in order for the repeater to support the scanning of the MSS, the base station provides information necessary for the scanning of the MSS. It is necessary to define a signaling procedure for instructing the repeater.

Accordingly, an object of the present invention is to provide an apparatus and method for supporting scanning of an MSS through a relay station in a broadband wireless access communication system using a multi-hop relay scheme.

Another object of the present invention is to provide an apparatus and method for transmitting and receiving a signal required between a relay station and a base station to support scanning of an MSS in a broadband wireless access communication system using a multi-hop relay scheme.

According to an aspect of the present invention for achieving the above object, in the cellular communication system using a multi-hop relay method for transmitting a scan request message received from the MSS to the base station in the communication method of the relay station (Relay Station), Receiving a scan command message including a scanning instruction from the base station, generating a scan response message corresponding to the received scan command message, and transmitting the generated scan response message to the MSS; Characterized in that.

According to another aspect of the present invention, in a communication method of a base station in a cellular communication system using a multi-hop relay method, receiving a scan request message of an MSS from a relay station and determining a scanning guide of the MSS. And generating a scan command message corresponding to the determined scanning instruction, and transmitting the generated scan command message to the relay station.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

The present invention relates to a mobile subscriber station (MSS) for a serving BS to a serving relay station in a broadband wireless access (BWA) communication system using a multi-hop relay scheme. We propose a signaling procedure for instructing to support scanning of MSS '. The MSS scans the serving base station, the neighbor base station and the serving relay station, and the neighbor relay station. The MSS has the same meaning as a terminal, and may be functionally mounted in a general phone, a personal digital assistant (PDA), a laptop, or used as a removable device in the form of a personal computer memory card international association (PCMCIA) card. have.

Here, the broadband wireless access communication system using the multi-hop relay scheme is, for example, orthogonal frequency division multiplexing (OFDM) and / or orthogonal frequency division multiple access (OFDMA). A communication system using an Orthogonal Frequency Division Multiple Access (hereinafter referred to as "OFDMA"). In the broadband wireless access communication system using the multi-hop relay method, since the OFDM / OFDMA method is used, high-speed data transmission is possible by transmitting a physical channel signal using a plurality of sub-carriers. It can support MSS mobility by supporting multi-cell structure.

In addition, the relay station of the broadband wireless access communication system using the multi-hop relay scheme may be a fixed node or a mobile node, or may be a specific system installed by a base station. That is, any node having the above characteristics may be selected as a relay station through a relay station capability negotiation procedure with the base station according to a predefined criterion for cell area expansion of the base station.

In the following description, a broadband wireless access communication system is described as an example, but the present invention may be equally applicable to a cellular-based communication system using a multi-hop relay method.

4 is a flowchart illustrating an operation procedure of a relay station performing a base station indication for a scanning request of a terminal in a broadband wireless communication system using a multi-hop relay scheme according to an exemplary embodiment of the present invention.

Referring to FIG. 4, in step 411, the RS performs communication with an MSS that does not directly transmit and receive a signal to and from the base station, and relays a signal between the MSS and the base station. In step 413, the RS receives a Scan Request (MOB_SCN-REQ) message from the MSS requesting scanning of pilot channel signals transmitted from serving base stations, neighboring base stations and serving relay stations, and adjacent relay stations. The scan request (MOB_SCN-REQ) message received in step 413 has the structure of <Table 1>. The relay station forwards the received scan request (MOB_SCN-REQ) message to the base station in step 415 and receives a terminal scan command (MOB_SCN-CMD) message from the base station in step 417.

The terminal scan command (MOB_SCN-CMD) message structure according to the present invention is as shown in Table 4 below.

Syntax Size Notes MOB_SCN-CMD_Message_format () { -  Management Message Type = TBD 8 bits -  Command indicator 2 bits This field indicates BS's direction. 00: make MOB_SCN-RSP with MS scanning intervals 01: make MOB_SCN-RSP with scan duration = 0 (to deny MOB_SCN-REQ) 10: inform of MS scanning operation 11: reserved  CID 16 bits Basic CID of MS  If (Command indicator! = 01) {   Start frame 4 bits Measured from the frame in which this message was received. A value of zero means that first scanning interval starts in the next frame.   Scan duration 8 bits Duration (in units of frames) where the MS may perform scanning.   Interleaving interval 8 bits Duration in frames. The period interleaved between scanning intervals when MS shall perform normal operation.   Scan iteration 8 bits The number of iterating scanning interval.   If (Command indicator == 00) {    Report mode 2 bits 0b00: no report 0b01: periodic report 0b10: event-triggered report 0b11: reserved    Report period 8 bits Available when the value of Report mode is set to 0b01. Report period in frames.    Report metric 8 bits Bitmap indicating metrics on which the corresponding triggers are based: Bit 0: CINR mean Bit 1: RSSI mean Bit 2: Relative delay Bit 3: RTD Bit 4-7: reserved; shall be set to zero    Reserved 4 bits Shall be set to zero    N_Recommended_BS / RS 8 bits Number of neighboring BS or RS to be scanned    For (i = 0; i <N_Recommended_BS / RS; i ++) { - -     Recommended BS / RS ID 48 bits ID of BSs or RSs that MS shall scan.    }   }  } }

As shown in Table 4, the terminal scan command (MOB_SCN-CMD) message according to the present invention includes a plurality of information elements (IEs), that is, a message type (Management Message Type) indicating a type of a transmitted message, and the base station. And a command indicator indicating a scan guide of the MS, and an identifier (CID) indicating an MSS to which scanning information according to the scan guide is to be applied. The command indicator is a terminal scan instruction for instructing the relay station to configure the scan response (MOB_SCN-RSP) message shown in Table 2, which includes the scan schedule of the MSS, and transmit the message to the MSS, or the relay station is configured to transmit the MSS. A scan response (MOB_SCN-RSP) message that rejects a scan request and includes a terminal scan rejection for instructing the MSS to transmit or a terminal scan notification for informing the relay station to perform the scanning of the MSS. In addition, when the command indicator indicates a UE scan indication or a UE scan notification, the UE scan command (MOB_SCN-CMD) message includes the scan schedule information of the MSS, that is, pilot channel signals in which the MSS is transmitted from neighboring base stations and neighboring relay stations. Scan Iteration, which indicates the start frame (Start frame) to start scanning for, the scan duration for the MSS to scan, and the number of repetitions of scanning if the scanning operation is repeated periodically. When the scanning operation is repeated, the scan intervals may include interleaving intervals representing time intervals between the scanning operations. When the command indicator indicates a terminal scan instruction, the terminal scan command (MOB_SCN-CMD) message indicates an identifier (BS) of neighboring base stations and neighboring relay stations to which the MSS will perform scanning, and scans the MSS. The reporting information required to report the results, that is, the scan mode report mode, the scan report period when the scan result report method is a periodic report, and the information to be reported as a scan result ( Report Metrics).

The RS receiving the UEB command (MOB_SCN-CMD) message checks whether the command indicator indicates the UE scan rejection in step 419, and if the command indicator is the UE scan rejection, the RS in step 421 scan duration. ) And configures a scan response (MOB_SCN-RSP) message of Table 2, which is set to 0, and sends it to the MSS. Alternatively, in step 423, if the command indicator indicates a terminal scan instruction, and if the command indicator indicates a terminal scan instruction, the RS in step 425 includes the UE included in the terminal scan command (MOB_SCN-CMD) message of Table 4 below. The scan response (MOB_SCN-RSP) message of Table 2 is constructed using the scan schedule and the scan report information, and then transmitted to the MSS. Alternatively, in step 427, if the command indicator indicates a terminal scan notification, and if the command indicator indicates a terminal scan notification, the RS transmits the MSS to the terminal scan command (MOB_SCN-CMD) message of Table 4 in step 429. It is recognized that scanning is performed according to the included terminal scan schedule information. Alternatively, when a command indicator other than the terminal scan rejection, terminal scan instruction, and terminal scan notification defined in the terminal scan command (MOB_SCN-CMD) message of Table 4 is defined, the RS may transmit the command indicator to the command indicator in step 431. Perform the action accordingly. That is, the relay station receiving the terminal scan command (MOB_SCN-CMD) message reads the information of the command indication field in the terminal scan command (MOB_SCN-CMD) message and sends a scan response (MOB_SCN-RSP) message corresponding to the corresponding instruction. Configure. Therefore, the decision operation of steps 419, 423 and 427 in FIG. 4 is a logical flow for better understanding and is not related to the temporal order. That is, when the RS decodes bit information of the command indication field, the RS configures a scan response (MOB_SCN-RSP) message corresponding to the corresponding indication.

In FIG. 4, the operation of the RS supporting the signaling required for the MSS scanning of the MSS according to the indication of the BS is described. Next, the operation of the BS instructing the RS to support the MSS scanning operation of the MSS is described with reference to FIG. Will be described.

5 is a flowchart illustrating an operation procedure of a base station instructing a relay station to scan a terminal request in a broadband wireless communication system using a multi-hop relay method according to an embodiment of the present invention.

Referring to FIG. 5, the base station first receives a scan request (MOB_SCN-REQ) message of the MSS forwarded by the RS in step 511, and determines a scan guide for the MSS in step 513. The scan instruction is a terminal scan rejection instructing the RS to transmit a scan response (MOB_SCN-RSP) message that rejects the MSS scan request, or allows the MSS to request a scan request to determine the MSS scan schedule and scan A terminal scan instruction for providing report information to the relay station and instructing the relay station to transmit a scan response (MOB_SCN-RSP) message using the provided information, or determining a scan schedule of the MSS and determining scan report information The MSS may transmit a scan response (MOB_SCN-RSP) message to allow the MSS to request the MSS and inform the RS of scan performance information of the MSS.

In step 515, the base station determines the scan instruction to be a terminal scan rejection. In step 517, the base station transmits a terminal scan command (MOB_SCN-CMD) message including a command indicator indicating a scan rejection of the MSS to the relay station. Or in step 519, if the base station determines the scan instruction as a terminal scan instruction, in step 521, the terminal scan command (MOB_SCN-CMD) including a command indicator indicating a scan instruction of the MSS and scanning schedule and scan report information of the MSS; ) Transmits a message to the relay station. Alternatively, in step 523, if the base station determines the scan instruction as a terminal scan notification, in step 525, a terminal scan command (MOB_SCN-CMD) message including a command indicator indicating that the MSS performs scanning and scanning schedule information of the MSS is sent. Send to the relay station. Alternatively, when a command indicator other than the terminal scan rejection, terminal scan instruction, and terminal scan notification defined in the terminal scan command (MOB_SCN-CMD) message of Table 4 is defined, the base station transmits to the command indicator in step 527. In order to perform the operation according to the relay station transmits a terminal scan command (MOB_SCN-CMD) message including the command indicator to the relay station. In FIG. 5, the UEscan guideline determination flow of steps 513 to 527 is a logical flow for clarity and is not related to the temporal order. That is, when the base station determines the scan instructions of the terminal in step 513, the base station transmits the instructions in a terminal scan command (MOB_SCN-CMD) message.

In the above process, the MSS provides a scan response (MOB_SCN-RSP) message, which is a response thereto when the MSS transmits a scan request (MOB_SCN-REQ) message requesting to perform scanning, with reference to FIGS. 4 and 5. The operation procedure of the base station transmitting the signal informing the MSS scan instructions and the operation procedure of the relay station processing the MSS scan instructions were described.

Next, when the base station instructs the MSS to perform the scan with reference to Figures 6 and 7, the base station of transmitting a signal informing the MSS scan instructions to the relay station in the process of providing a scan response (MOB_SCN-RSP) message to the MSS An operation procedure and an operation procedure of the relay station processing the MSS scan guide will be described.

6 illustrates an operation procedure of a base station instructing a relay station to scan a base station request in a broadband wireless communication system using a multi-hop relay method according to an embodiment of the present invention.

Referring to FIG. 6, the base station first decides to instruct the MSS to perform scanning in step 611, and then determines scan instructions of the MSS to inform the RS. The scan instructions allow the relay station to request a scan of the MSS to determine the scan schedule of the MSS, provide scan report information to the relay station, and the relay station sends a scan response (MOB_SCN-RSP) message using the provided information. The MSS sends a scan response (MOB_SCN-RSP) message to allow the MSS to request a scan request by determining a scan schedule of the MSS and determining scan report information to scan the MSS. It may be a terminal scan notification that informs the relay station of performance information.

In step 613, if the scan instruction is a UE scan instruction, the BS transmits a command indicator for instructing the MSS to perform a scan and a UE scan command (MOB_SCN-CMD) message including scan schedule and scan report information of the MSS. Send to the relay station. Alternatively, in step 617, if the scan instruction is a UE scan notification, the BS transmits a command scan command (MOB_SCN-CMD) message including a command indicator for notifying scan performance of the MSS and scan schedule information of the MSS to the RS in step 619. send. Alternatively, when a command indicator other than the terminal scan rejection, terminal scan instruction, and terminal scan notification defined in the terminal scan command (MOB_SCN-CMD) message of Table 4 is defined, the base station determines in step 621 the command indicator. In order to perform the operation according to the relay station transmits a terminal scan command (MOB_SCN-CMD) message including the command indicator to the relay station. In FIG. 6, the UE scanning instruction determination flow of steps 611 to 621 is a logical flow for easy understanding, and is not related to the temporal order. That is, when the base station determines the scan instruction of the terminal in step 611, the base station transmits the corresponding instruction as a terminal scan command (MOB_SCN-CMD) message.

FIG. 7 illustrates an operation procedure of a relay station performing a base station indication on a base station request scanning in a broadband wireless communication system using a multi-hop relay scheme according to an embodiment of the present invention.

The relay station communicates with the MSS and the base station in step 711 and relays a signal between the MSS and the base station. When the relay station receives the terminal scan command (MOB_SCN-CMD) message of Table 4 from the base station in step 713, it checks whether the command indicator of the message is a terminal scan command in step 715. In step 715, when the command indicator is a terminal scan instruction, the RS transmits a scan response (MOB_SCN-RSP) message using the scan schedule and scan report information of the MSS included in the terminal scan command (MOB_SCN-CMD) message. Configures and sends the scan response (MOB_SCN-RSP) message to instruct the MSS to perform a scan. Alternatively, when the command indicator is a terminal scan notification in step 719, the RS recognizes that the MSS performs scanning according to a scan schedule of the MSS included in the terminal scan command (MOB_SCN-CMD) message. Alternatively, when a command indicator other than the terminal scan rejection, terminal scan instruction, and terminal scan notification defined in the terminal scan command (MOB_SCN-CMD) message of Table 4 is defined, the relay station transmits to the command indicator in step 723. Perform the action accordingly. That is, the relay station receiving the terminal scan command (MOB_SCN-CMD) message reads the information of the command indication field in the terminal scan command (MOB_SCN-CMD) message and sends a scan response (MOB_SCN-RSP) message corresponding to the corresponding instruction. Configure or recognize the terminal scan operation. Therefore, the judgment operation of steps 715 and 719 in FIG. 7 is a logical flow for better understanding and is not related to the temporal order. That is, when the RS decodes bit information of the command indication field, the RS configures a scan response (MOB_SCN-RSP) message or recognizes a UE scan operation according to the corresponding instruction.

Hereinafter, a block diagram of a relay station (RS) and a base station (BS) according to the present invention will be described. Since the relay station RS and the base station BS having the same interface module (communication module) have the same block configuration, the operation of the relay station and the base station with one device will be described below.

8 is a block diagram of a relay station or base station according to an embodiment of the present invention. The following description will focus on the control message processing.

First, referring to FIG. 8, the configuration of the relay station is as follows.

The interface module 821 is a module for communicating with an MSS or a base station, and includes an RF processor and a baseband processor. The RF processor converts a signal received through an antenna into a baseband signal and provides the baseband signal to the baseband processor, and transmits a baseband signal from the baseband processor on an actual air. Transmit to and transmit through the antenna. For example, when using a broadband wireless access method, the baseband processor controls the fast Fourier transform (FFT) and channel decodes a signal from the RF processor to control the original information data (traffic or control message). To pass). On the contrary, channel data and IFFT (Inverse Fast Fourier Transform) calculation are performed on the information data from the controller 819 and provided to the RF processor.

The controller 819 controls the overall operation of the relay station. For example, it performs processing and control for voice calls and data communications, and handles operations to support scanning of the MSS according to the present invention in addition to the usual functions. According to the present invention, the control unit 819 provides a control message received from the MSS or the base station to the message processing unit 811 and receives a message to be transmitted to the MSS or the base station from the message generating unit 813. 821).

The storage unit 817 stores a program for controlling the overall operation of the relay station and temporary data generated during program execution. That is, the storage unit 817 may store data and control information to be transmitted to the MSS or the base station.

The message processing unit 811 decomposes the control message received from the MSS or the base station and notifies the control unit 819 of the result. According to the present invention, when the scan request (MOB_SCN-REQ) message of Table 1 is received from the MSS or when the terminal scan command (MOB_SCN-CMD) message of Table 4 is received from the base station, the message is included in the received message. Various control information is extracted and provided to the controller 819. Then, the controller 819 performs a corresponding process according to the control information from the message processor 811.

The terminal scan command processor 815 performs a function for supporting a scanning operation of the MSS under the control of the controller 819. According to the present invention, the base station processes the MSS scan instructions provided in connection with the scanning of the MSS and performs the function of processing the scanning related information of the MSS.

The message generator 813 controls the scan response (MOB_SCN-RSP) message of Table 2 to be transmitted to the MSS or the scan request (MOB_SCN-REQ) message of Table 1 to be transmitted to the base station under the control of the controller 819. It generates and provides to the controller 819. The message generated by the message generator 813 is transferred to the interface module 821 through the controller 819.

In the above-described configuration of the relay station, the controller 819 controls the message processor 811, the message generator 813, and the terminal scan command processor 815. That is, the controller 819 may perform the functions of the message processor 811, the message generator 813, and the terminal scan command processor 815. In the present invention, it is shown to configure them separately to explain each function separately. Therefore, when the product is actually implemented, all of them may be configured to be processed by the controller 819, and only some of them may be configured to be processed by the controller 819.

Next, the configuration of the base station with reference to FIG. 8 is as follows.

The interface module 821 is a module for communicating with an MSS or a relay station, and includes an RF processor, a baseband processor, and the like. The RF processor converts a signal received through an antenna into a baseband signal and provides the baseband signal to the baseband processor, and transmits a baseband signal from the baseband processor on an actual air. Transmit to and transmit through the antenna. For example, when using a broadband wireless access method, the baseband processor controls the fast Fourier transform (FFT) and channel decodes a signal from the RF processor to control the original information data (traffic or control message). To pass). On the contrary, channel data and IFFT (Inverse Fast Fourier Transform) calculation are performed on the information data from the controller 819 and provided to the RF processor.

The controller 819 controls the overall operation of the base station. For example, it performs processing and control for voice call and data communication, and processes the scanning operation of the MSS according to the present invention in addition to the usual functions. According to the present invention, the control unit 819 provides a control message received from the MSS or the relay station to the message processing unit 811 and receives a message to be transmitted to the MSS or the relay station from the message generating unit 813. 821).

The storage unit 817 stores a program for controlling the overall operation of the base station and temporary data generated during program execution. That is, the storage unit 817 may generally store data and control information to be transmitted to the MSS or the relay station.

The message processing unit 811 decomposes the control message received from the MSS or the relay station and notifies the control unit 819 of the result. When the scan request (MOB_SCN-REQ) message of Table 1 is received from the relay station according to the present invention, various control information included in the received message is extracted and provided to the controller 819. Then, the controller 819 performs a corresponding process according to the control information from the message processor 811.

The terminal scan command processor 815 manages a scanning operation of the MSS under the control of the controller 819. According to the present invention, an operation of determining a scanning schedule of an MSS and determining information necessary for reporting a scanning result of the MSS are processed. It also processes MSS scan guide information and the like necessary for instructing the relay station to scan the MSS.

The message generator 813 generates a message to be transmitted to the MSS or the relay station under the control of the controller 819 and provides the message to the controller 819. According to the present invention, the terminal scan command (MOB_SCN-CMD) message of Table 4 or the scan response (MOB_SCN-RSP) message of Table 2 to be transmitted to the relay station is generated and provided to the controller 819. The message generated by the message generator 813 is transferred to the interface module 821 through the controller 819.

In the configuration of the base station described above, the controller 819 controls the message processor 811, the message generator 813, and the terminal scan command processor 815. That is, the controller 819 may perform the functions of the message processor 811, the message generator 813, and the terminal scan command processor 815. In the present invention, it is shown to configure them separately to explain each function separately. Therefore, when the product is actually implemented, all of them may be configured to be processed by the controller 819, and only some of them may be configured to be processed by the controller 819.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. For example, the above-described message structures are just examples for better understanding of the present invention, and those skilled in the art can easily perform the modifications. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention provides a relay station capable of providing a multi-hop relay path between the MSS and the base station when the direct link channel condition between the base station and the MSS is poor in a broadband wireless access communication system using the OFDM and / or OFDMA scheme. By using, it is possible to provide the MSS to the MSS through the relay station the same services and functions as in the case of performing a direct link with the base station. In addition, the present invention provides the same services and functions between the MSS and the base station, and has the advantage of synchronizing the operation of the system and reduce the difference between the system that can occur due to the dual signaling between the relay station and the MSS and the relay station and the base station.

Claims (13)

In a communication method of a relay station in a cellular communication system using a multi-hop relay method, Transmitting a scan request message received from the terminal to the base station; Receiving a scan command message including scanning instructions from the base station; Generating a scan response message corresponding to the received scan command message; And transmitting the generated scan response message to the terminal. The method of claim 1, The scan request message includes information of neighboring base stations and neighboring relay stations desired to be scanned. The method of claim 1, The scanning instruction is characterized in that one of the terminal scan rejection, the terminal scan instruction, the terminal scan notification. The method of claim 3, And receiving a scan command message including scan schedule and scan result report information necessary for the terminal when the scanning instruction is a terminal scan instruction. The method of claim 3, And transmitting a scan response message to the terminal by setting a scan interval to zero when the scanning instruction is a terminal scan rejection. In a communication method of a base station in a cellular communication system using a multi-hop relay method, Receiving a scan request message of the terminal from the relay station; Determining a scanning instruction of the terminal; Generating a scan command message corresponding to the determined scanning instruction; And transmitting the generated scan command message to the relay station. The method of claim 6, The scan request message includes information of neighboring base stations and neighboring relay stations desired to be scanned. The method of claim 6, The scanning instruction is characterized in that one of the terminal scan rejection, the terminal scan instruction, the terminal scan notification. The method of claim 8, And transmitting a scan command message including scan schedule and scan result report information necessary for the terminal when the scanning instruction is a terminal scan instruction. In a relay station device in a cellular communication system using a multi-hop relay method, A message processing unit for processing a scan request message received from the terminal; A message generator for generating a scan response message corresponding to a scan command message including a scanning instruction from the base station; And an interface module for transmitting a message from the message generator through an antenna. The method of claim 10, And the scanning instructions are one of a terminal scan rejection, a terminal scan instruction, and a terminal scan notification. The method of claim 11, And receiving a scan command message including scan schedule and scan result report information necessary for the terminal when the scanning instruction is a terminal scan instruction. The method of claim 11, And transmitting the scan response message to the terminal by setting the scan interval to zero when the scanning instruction is the terminal scan rejection.

Images