KR101138891B1 - Apparatus and method for acquisition of neighbor base station and neighbor relay station in a multi-hop relay broadband wireless access communication systems - Google Patents

Abstract

Apparatus and method for acquiring information of neighbor base stations and neighbor relay stations in a cellular communication system using a multi-hop relay method, the obtaining method according to the present invention, the relay station is a table of the information of the neighbor base stations and neighbor relay stations; And transmitting the scan report message to the relay station by scanning the neighbor base stations and neighboring relay stations, and transmitting the scan report message to the relay station. Checking whether information about the neighboring or neighboring relay stations is included, updating the neighbor base station or the neighboring relay station management table information by the relay station when the newly discovered neighboring base stations or neighboring relay stations are included; The relay station transmits the updated table information to the relay station. Including the process of transmitting to the terminals included in the service area, the neighbor base station and relay station information can be easily obtained, and the accuracy of the neighbor base station and relay station information transmitted to the terminal included in the service area of the relay station (or base station) is increased. There is an advantage to this.

 Relay Station, Scan Report Message, Peripheral Base Station, Peripheral Relay Station, Multi-hop Relay

Description

Apparatus and method for acquiring neighboring base station and relay station information in a multi-hop relay broadband wireless access communication system

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

2 is a diagram illustrating a signaling procedure between a mobile subscriber station and a base station for performing an operation in a broadband wireless access communication system according to the prior art;

3 is a diagram schematically showing the structure of a radio access communication system using a multi-hop relay scheme;

4 is a diagram illustrating a relay station distribution in a wireless access communication system using a multi-hop relay scheme;

5 is a diagram illustrating a procedure for acquiring and managing information of neighboring base stations and neighboring relay stations in a broadband wireless access communication system according to an embodiment of the present invention;

6 is a diagram illustrating an operation procedure of a relay station (or base station) for managing information of neighboring base stations and neighboring relay stations in a broadband wireless access communication system according to an embodiment of the present invention;

7 is a block diagram of a relay station (or base station) in a broadband wireless access communication system according to the present invention.

The present invention relates to a broadband wireless access communication system using a multi-hop relay method, and more particularly, to obtain neighbor base station and neighboring relay station information using scanning information of a terminal in a broadband wireless access communication system using the multi-hop relay method. An apparatus and method are provided.

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) / orthogonal frequency division on a physical channel of the wireless MAN system. A communication system employing an Orthogonal Frequency Division Multiple Access (OFDMA) scheme is adopted. 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 in which SS mobility is added to 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.

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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. ), A base station 140 that manages the cell 150, and a plurality of MSSs 111, 113, 130, 151, and 153. In addition, signal transmission and reception between the base stations 110, 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 is a boundary area of the cell 100 and the cell 150, that is, a handover. ) Exists in the realm. 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, a serving BS of the MSS 130 is moved to the serving BS. It is changed from the base station 110 to the base station 140.

2 illustrates a signaling procedure between the MSS and a base station for scanning by the MSS in an IEEE 802.16e communication system.

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

Referring to FIG. 2, the MSS 210 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” indicating the desired scan interval, “Scan Iteration” indicating the number of scanning if the scanning operation is repeated periodically, “Interleaving interval” indicating the time interval between each scanning operation when the scanning operation is repeated, and scanning It includes a "Recommended_BS_ID" indicating each base station to be desired. Since the time point at which the MSS 210 makes a scan request is not directly related to the scanning operation of the pilot channel signal, a detailed description thereof will be omitted.

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 "Management Message Type" indicating the type of a transmitted message, a scan interval in which the MSS performs scanning, a scan result reporting method, 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, the start point of the scan operation, the number of scan repetitions when the periodic scan is performed, and the time between scans Interval and information of each base station to be scanned. Here, the scan interval, when the value is 0, indicates that the scanning request of the MSS has been rejected, and the information to be reported as the scan result is received signal strength in addition to the carrier to interference and noise ratio (CINR). Indication), relative delay, and round trip delay (RTD).

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).

When the MSS 210 completes scanning of the pilot channel signals received from the neighbor base stations and the serving base station 230, the MSS 210 reports the mobile subscriber station scan report (MOB_SCN-REP) to inform the scan result in step 221. : Mobile Scanning Result Report, hereinafter referred to as 'MOB_SCN-REP' 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 (CINR / RSSI / Relative delay / RTD / etc.)   } }

As shown in Table 3, the MOB_SCN-REP message includes a management message type indicating a plurality of IEs, that is, a type of a message to be transmitted, a method in which the MSS reports a scanning result, information to be reported as a scan result, It includes information on each base station that the MSS has scanned, and scan result information about each base station. The scan result information may be included in the MOB_SCN-REP message according to whether information to be reported as the scan result is included, and the scan result information may include RSSI, relative delay, and RTD in addition to CINR.

In the general IEEE 802.16e communication system, since signaling is transmitted and received through a direct link between the fixed base station and the MSS, as shown in FIG. 2, a reliable wireless communication link can be easily configured between the base station and the MSS. 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.

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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 includes a base station 310 and a plurality of MSSs 311, 313, 331, and 333, and the base station and the MSS. It consists of a relay station (320) that provides a multi-hop relay path between them. 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. have. However, the 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 that cannot directly transmit and receive a signal as described above. 331 and 333 may transmit and receive a signal with the base station 310 through the relay station 320.

As described above, in a wireless communication system using a multi-hop relay method through a relay station, the MSS can communicate by establishing a direct link with the base station, and when the traffic cannot be transmitted or received through the direct link with the base station, The relay station can communicate with the base station. Therefore, even in a wireless communication system using a multi-hop relay method, an operation for applying the same services and functions provided in the existing wireless communication system should be defined.

In the case of a broadband wireless access communication system using a multi-hop relay scheme, as the target of communication in the MSS is extended to the base station and the relay station, the MSS scans not only neighboring base stations but also neighboring relay stations for smooth communication. Should be included in

As described above, the neighboring base station and the neighboring relay station are scanned by receiving information of the neighboring base station and the neighboring relay station from the serving relay station currently communicating with the MSS to scan the neighboring base stations as well as the neighboring base stations. However, when the serving relay station provides the terminal with information of all the relay stations connected to the neighbor base stations, there is a limit to transmitting the information of the neighbor base stations and the repeaters with a limited transmission capacity.

4 illustrates a relay station distribution of a radio access communication system using a multi-hop relay scheme. In the following description, although the base station may include a large number of relay stations, it is assumed that only 10 relay stations are included.

As shown in FIG. 4, the terminal 411 is currently connected to the BS1 401 using the RS8 413 as a serving relay station to receive a service.

Since the BS1 401 has two base stations, BS2 403 and BS3 405, the serving relay station 413 is configured to scan the neighbor BS and all RSs. In addition to BS2 403 and BS3 405, the information of the relay station included in the two base stations should be transmitted to the terminal 411. That is, two neighbor base stations and 20 neighbor relay stations should be transmitted.

In general, a mobile communication network manages dozens of neighbor base station information and provides the terminal with information of the neighbor base stations as broadcast messages. Therefore, assuming that 20 neighbor base stations exist in the broadband wireless network using the multi-hop relay scheme and each base station includes 10 relay stations, the serving station manages information of a total of 240 neighbor base stations and relay stations. Must be provided to the terminal.

As described above, in a broadband wireless access communication system using a multi-hop relay method, since information of not only neighboring base stations but also relay stations must be provided together, the information of the neighboring relay stations is added to the neighbor base station information advertisement message according to the prior art and transmitted. There is a problem that is practically impossible.

Accordingly, an object of the present invention is to provide an apparatus and method for acquiring information of neighboring base stations and neighboring relay stations which are not recognized by a relay station communicating with a terminal in a broadband wireless access system using a multi-hop relay scheme.

Another object of the present invention is an apparatus for acquiring information of neighboring base stations and neighboring relay stations which are not recognized by a relay station communicating with a terminal in a broadband wireless access system using a multi-hop relay method with reference to scanning information reported by the terminal to the relay station. And providing a method.

According to a first aspect of the present invention for achieving the above object, a communication method of a relay station in a cellular communication system using a multi-hop relay method, the process of transmitting the information of the neighbor base stations and the neighboring relay stations to the terminal; And when the scan report message is received from the terminal, checking whether the scan report message includes information of new neighbor base stations or neighboring relay stations other than the transmitted neighbor base stations and neighbor relay stations. If the report message includes new neighbor base stations or neighboring relay stations information, updating the neighbor base stations and neighboring relay stations information, and including the updated neighbor base stations and neighboring relay stations information in the service area of the relay station; Characterized in that it comprises the step of transmitting to the terminal.

According to a second aspect of the present invention, in a cellular communication system using a multi-hop relay method, a method for acquiring information of neighbor base stations and neighbor relay stations may include transmitting information of neighbor base stations and neighbor relay stations to a terminal. And transmitting, by the terminal, a scan report message including scanning information about neighboring base stations and neighboring relay stations to the relay station using information of neighboring base stations and neighboring relay stations received from the relay station; The RS checks whether the scan report message includes information on newly discovered neighbor BSs or neighbor RSs, and when the RS includes information on the newly found neighbor BSs or neighbor RSs, neighbor BSs. Or updating information of neighboring relay stations, wherein the relay station includes: It characterized by comprising the step of transmitting a group of updating a neighbor base station or the relay station close to the terminal information included in the service area of the relay station.

According to a third aspect of the present invention, in a cellular wireless communication system using a multi-hop relay method, a relay station apparatus may include information about newly discovered neighboring base stations or neighboring relay stations in a scan report message received from a terminal. A message processing unit for checking, a controller for updating the newly discovered neighbor base stations or neighboring relay stations when the scan report message includes information on neighbor base stations and neighboring relay stations stored by the relay station, and the updated neighbor Message generating unit for generating a message to be transmitted to the base station and the neighboring relay station information to the terminal included in the service area, and an interface module for converting the generated message according to a prescribed wireless standard and transmits through an antenna Characterized in that.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, the present invention provides a scanning provided from a mobile subscriber station (hereinafter referred to as 'MSS') in a broadband wireless access communication system using a multi-hop relay method. A technique for acquiring information of neighboring base stations and neighboring relay stations which are not recognized by a relay station or a base station communicating with the MSS using information is described. In other words, as shown in FIG. 4, the serving relay station RS8 is difficult to transmit information including information of all the relay stations located in the neighboring base station to the MSS. Accordingly, the present invention will be described below for a technique for acquiring only neighboring relay station information capable of receiving a signal by the MSS, not information of all neighboring relay stations included in the neighboring base station.

In the following description, the broadband wireless access communication system includes an Orthogonal Frequency Division Multiplexing (OFDM) scheme and an Orthogonal Frequency Division Multiple Access (OFDMA) scheme. A communication system using the &quot; OFDMA &quot; Accordingly, since the broadband wireless access communication system uses an OFDM / OFDMA scheme, high-speed data transmission is possible by transmitting a physical channel signal using a plurality of sub-carriers, and a multi-cell structure. It is a communication system that supports mobility of MSS by supporting it.

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.

FIG. 5 illustrates a procedure for acquiring and managing information of neighboring base stations and neighboring relay stations in a broadband wireless access communication system according to an embodiment of the present invention. In the following description, a method for acquiring information of neighboring base stations and neighboring relay stations using scanning information of a terminal is described by taking a relay station because the relay station and the base station operate in the same manner.

Referring to FIG. 5, the terminal 1 501 communicates with the relay station 503 in step 507. That is, the terminal 1 501 communicates with a base station using the relay station 503.

In step 509, the RS 503 may transmit information about neighbor base stations and neighbor RSs to terminals (eg, Terminal 1 501 and Terminal 2 505) located in an area where the RS 503 itself provides a service. The message of the BS 2 403 and the BS 3 405 of FIG. 4 is broadcasted. Here, the neighbor base station and neighbor relay station information provides the frequency information (Center Frequency) of the neighbor base stations or neighboring relay stations. Also, the terminal 1 501 and the terminal 2 505 that receive the neighbor base station and the neighbor RS information message recognize that the base station 2 403 and the base station 3 405 are located in their vicinity.

If it is determined that scanning is required during communication with the relay station 503, the terminal 1 501 requests a scan to the relay station 503 to perform scanning to obtain information of neighboring base stations and neighboring relay stations in step 511. MOB_SCN_REQ) message is sent.

When the scan request message is received, the RS 503 transmits a scan response (MOB_SCN_RSP) message including information necessary for the scan operation of the MS 1 501 to the MS 1 501 in step 513. . The information necessary for the scan operation may include a scan section, a scan result report method, a scan report period to be applied when the scan result report method is a periodic result report, information to be reported as a scan result, and start a scan operation. And node identifier information indicating a number of scan repetitions, a time interval between every scan operation, and base stations and relay stations to be scanned. In this case, when the value of the scan interval is 0, it indicates that the scanning request of the terminal 1 501 is denied.

When the scan response message is received, the terminal 1 501 scans neighboring base stations and neighboring relay stations using the parameters included in the scan response message in step 515. For example, the terminal 1 501 scans pilot channel signals received from the neighbor base stations and neighbor relay stations.

When scanning the neighboring base station and the neighboring relay station, the terminal 1 501 scans the neighboring base station and the neighboring relay station included in the list of the neighboring base station and the neighboring relay station received from the relay station 503 in step 519. Thereafter, when the scan interval remains, the terminal 1 501 scans an arbitrary frequency band or all frequency bands and checks whether a signal is detected. If a signal is detected, the terminal 1 501 additionally scans a neighbor base station and a neighbor relay station corresponding to the detected signal. For another example, the terminal 1 501 detects a signal by scanning an arbitrary frequency band or all frequency bands even when the neighboring base station and neighboring relay station information provided by the relay station 503 is not suitable and thus the actual scanning is impossible. You can check. For another example, the terminal 1 501 may determine whether a signal is detected by scanning arbitrary frequency bands or all frequency bands of neighboring base stations and neighboring relay stations which are not provided from the relay station 503 by their own judgment. have.

The relay station 503 stops data transmission to the terminal 1 501 in step 517 while the terminal 1 501 is scanning. That is, the relay station 503 buffers data to be transmitted to the terminal 1 501.

The terminal 1 501 scans the neighbor base stations and neighboring relay stations and transmits a scan report (MOB_SCN_REP) message including the scan result to the relay station 503. The information included in the scan report message may include a received signal strength indication (RSSI), a relative delay, a round trip delay (RTD), and the like in addition to a carrier to interference and noise ratio (CINR).

In this case, the terminal 1 501 includes information of the new base station or relay stations in the scan report message when signals of new base stations or relay stations are scanned in addition to the list of neighbor base stations and neighboring relay stations provided from the relay station 503. . For example, when RS12 and RS17 are newly found in FIG. 4, scan information of the RS12 and RS17 is included in the scan report message.

When the scan report message is received, the relay station 503 checks whether the scan report message includes information of a new base station or relay station. If the information of the new base station or relay station is included, the relay station 503 proceeds to step 523 and displays the information of the newly discovered base station or relay station in the neighbor base station and neighbor relay station information table managed by the relay station 503. Register additionally. For example, the newly discovered RS12 and RS17 relay station information is additionally registered in the neighbor base station and neighbor relay station information tables in which the base station 2 403 and the base station 3 405 lists are recorded.

Subsequently, the RS 503 transmits the additionally registered neighbor BS and neighbor RS information table information to the UE 1 501 and the UE 2 505 included in the service area of the RS 503 in steps 525 and 527. to provide.

6 is a flowchart illustrating an operation procedure of a relay station (or base station) for managing information of neighboring base stations and neighboring relay stations in a broadband wireless access communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 6, in step 601, the relay station 503 configures the neighbor base station and the neighbor relay station management table by using the neighbor base station and the neighbor relay station information recognized by the relay station 503. For example, as shown in FIG. 4, when the relay station 413 recognizes the base station 2 403 and the base station 3 405, the information of the base station 2 403 and the base station 3 405. Configure the neighbor base station and the neighbor relay station management table using the &lt; RTI ID = 0.0 &gt;

When the neighbor base station and the neighbor relay station management table are configured, the relay station 503 proceeds to step 603 to transmit the neighbor base station and neighbor relay station information message including the information of the configured neighbor base station and neighbor relay station management table to the relay station 503. Broadcasts to the terminals (eg, terminal 1 501 and terminal 2 505 of FIG. 5) included in the service area of FIG. 5.

In step 605, the RS 503 checks whether a scanning request message is received from the terminal receiving the neighbor BS and the neighbor RS information message. For example, in FIG. 5, it is checked whether a scanning request message is received from the terminal 1 501 communicating with the relay station 503.

When the scanning request message is received, the RS 503 proceeds to step 607 and transmits a scan response message for allowing the scanning operation. Here, the scan response message may include a scan section, a scan result report method, a scan report period to be applied when the scan result report method is a periodic result report, information to be reported as a scan result, and a time point at which a scan operation is started. And information necessary for a scan operation such as the number of scan repetitions, the time interval between every scan operation, and node identifier information indicating the base stations and relay stations to be scanned when performing a periodic scan.

In step 609, the RS 503 checks whether a scan report message is received from the MS. When the scan report message is received, the RS 503 proceeds to step 611 to determine whether the scan report message includes new neighbor BS or neighbor RS information which the RS 503 did not recognize.

If the scan report message includes new neighbor base station or relay station information, the relay station 503 proceeds to step 613 to transmit the newly found neighbor base station or relay station information to the neighbor base station and neighbor relay station management table of the relay station 503. Register additionally.

Subsequently, the RS 503 proceeds to step 615 to transmit the neighbor BS and RS information message including the newly registered neighbor BS and neighbor RS management table information to terminals included in the service area of the RS 503. Broadcast. The relay station 503 then terminates this algorithm.

7 is a block diagram of a relay station (or base station) in a broadband wireless access communication system according to the present invention. In the following description, since the relay station and the base station having the same interface module have the same block configuration, the relay station will be described by way of example.

As illustrated in FIG. 7, the RS includes a message processor 711, a message generator 713, a scanning processor 715, a storage 717, a controller 719, and an interface module 721. It is composed.

The interface module 721 is a module for communicating with a terminal or a base 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 719 and provided to the RF processor.

The controller 719 controls the overall operation of the relay station. For example, it performs processing and control for voice call and data communication, and provides a control message received from the terminal to the message processing unit 711 according to the present invention in addition to the normal function, and provides a message to be transmitted to the terminal. It receives from the message generator 713 and provides it to the interface module 721. In addition, when the scan report message received from the terminal includes the newly searched neighbor base station or relay station information, the newly searched neighbor base station or relay station information is additionally registered in the neighbor base station and the neighbor relay table terminal included in the service area of the relay station To control the transfer.

The storage unit 717 stores a program for controlling the overall operation of the relay station and temporary data generated during program execution. That is, the storage unit 717 may store data and control information to be transmitted to the terminal.

The message processor 711 decomposes the control message received from the terminal and notifies the controller 719 of the result. According to the present invention, when the scan request (MOB_SCN-RQE) message and the scan report (MOB_SCN-REP) message are received from the terminal, various control information included in the received message and newly discovered neighboring base station or relay station information are displayed. Extracted and provided to the control unit 719.

The scanning processor 715 performs a function of managing terminals performing a scanning operation under the control of the controller 719. According to the present invention, an operation of recognizing a terminal performing a scanning operation and an operation of stopping data transmission to the terminal are processed. In addition, the scanning processing unit 715 processes the operation of recognizing the completion of the scanning of the terminal and the operation of restarting the transmission of the data buffered in the storage unit 717 to the terminal.

The message generator 713 generates the scan response (MOB_SCN-RSP) message to be transmitted to the terminal under the control of the controller 719 and provides the generated message to the controller 719. In addition, the neighbor base station and the repeater information message is generated and transmitted to the control unit 719. The message generated by the message generator 713 is transferred to the interface module 721 through the controller 719.

In the above configuration of the relay station, the controller 719 controls the message processor 711, the message generator 713, and the scanning processor 715. That is, the controller 719 may perform the functions of the message processor 711, the message generator 713, and the scanning processor 715. In the present invention, it is shown to configure them separately to explain each function separately. Therefore, in the case of actually implementing a product, all of them may be configured to be processed by the controller 719, and only some of them may be configured to be processed by the controller 719.

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. 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, in a broadband wireless access communication system using a multi-hop relay method, the relay station (or base station) recognizes neighboring base stations or relay stations using the scanning result report of the terminal, thereby easily obtaining neighboring base station and relay station information, There is an advantage that the accuracy of the information of the neighbor base station and the relay station transmitted to the terminal included in the service area of the relay station (or base station).

Claims (18)

In a communication method of a relay station in a cellular communication system using a multi-hop relay method, Transmitting information of neighbor base stations and neighbor relay stations to the terminal; When the scan report message is received from the terminal, checking whether the scan report message includes new neighbor base stations or neighboring relay stations information other than the transmitted neighbor base stations and neighbor relay stations; When the scan report message includes new neighbor BSs or neighbor RSs, updating the neighbor BSs and neighbor RSs; Transmitting the updated neighbor base stations and neighboring relay stations information to terminals included in the service area of the relay station, When transmitting the information of the neighbor base stations and neighboring relay stations to the terminal, and a message for requesting scanning from the terminal before receiving a scan report message is received, necessary for scanning of the terminal in response to the scan request message And transmitting a scan response message including the information. delete The method of claim 1, The process of transmitting the neighbor base stations and neighboring relay stations information to the terminal, And transmitting information on the neighbor base stations and neighboring relay stations to terminals included in a service area of the relay station using a broadcasting message. The method of claim 1, The scan report message may include at least one of a scan result report method, a type of information to be reported as a scan result, information of neighboring base stations and neighboring relay stations which have been scanned, and scan result information of each base station and relay stations. How to. The method of claim 4, wherein The information of the neighbor base stations and the neighboring relay station performing the scanning, characterized in that it comprises the information of the newly discovered neighboring base stations or neighboring relay stations. The method of claim 1, The process of updating the neighbor base stations and neighboring relay stations information, And registering information on the newly discovered neighbor base stations or neighbor relay stations in a neighbor base station and neighbor relay stations management table. A method for obtaining information of neighbor base stations and neighbor relay stations in a cellular communication system using a multi-hop relay scheme, The relay station, the process of transmitting the information of the neighbor base stations and neighboring relay stations to the terminal, Transmitting, by the terminal, a scan report message including scanning information about neighboring base stations and neighboring relay stations to the relay station by using information of neighboring base stations and neighboring relay stations received from the relay station; The relay station checks whether the scan report message includes information on newly discovered neighboring base stations or neighboring relay stations; When the relay station includes information on the newly discovered neighboring base stations or neighboring relay stations, updating the neighbor base stations or neighboring relay stations information; The RS may include transmitting the updated neighbor BSs or neighbor RSs to terminals included in a service area of the RS, The terminal may receive information from neighboring base stations and neighboring relay stations from the relay station, and when scanning is necessary before transmitting a scan report message to the relay station, transmitting a message requesting scanning to the relay station; The relay station, transmitting a scan response message including information necessary for scanning of the terminal to the terminal; The terminal may include scanning neighbor base stations and neighbor relay stations using information of the scan response message. delete The method of claim 7, wherein The process of transmitting the information of the neighbor base stations and neighboring relay stations to the terminal, The relay station, characterized in that for transmitting the neighboring base station and the neighboring relay station information to the terminals included in the service area of the relay station using a broadcast message. The method of claim 7, wherein The scan report message may include at least one of a scan result report method, a type of information to be reported as a scan result, information of neighboring base stations and neighboring relay stations which have been scanned, and scan result information of each base station and relay stations. How to. The method of claim 10, The information of the neighbor base stations and neighbor relay stations that performed the scanning, characterized in that it comprises the information of the newly discovered neighbor base stations or neighbor relay stations. The method of claim 7, wherein The process of updating the neighbor base stations and neighboring relay stations information, And the relay station further registers information of the newly discovered neighbor base stations or neighbor relay stations in a neighbor base station and neighbor relay stations management table. In a relay station device in a cellular wireless communication system using a multi-hop relay method, A message processing unit for confirming whether the scan report message received from the terminal includes information of newly discovered neighboring base stations or neighboring relay stations; A control unit for updating the neighbor base stations and neighboring relay stations stored by the relay station when the scan report message includes information on newly discovered neighbor base stations or neighboring relay stations; A message generator for generating a message for transmitting the updated neighbor base stations and neighboring relay stations information to terminals included in the relay station service area; An interface module for converting the generated message according to a prescribed wireless standard and transmitting the converted message through an antenna; The control unit transmits information on the neighbor base stations and neighboring relay stations to a terminal, and when a message requesting scanning is received from the terminal before a scan report message is received, the controller responds to the scan request message. And send a scan response message including information necessary for scanning of the device. The method of claim 13, The scan report message may include at least one of a scan result report method, a type of information to be reported as a scan result, information of neighboring base stations and neighboring relay stations which have been scanned, and scan result information of each base station and relay stations. Device. The method of claim 13, And a storage unit for storing the neighbor base stations and neighboring relay stations information. The method of claim 13, The interface module, characterized in that the module for orthogonal frequency division multiplexing (OFDM) communication. The method of claim 13, The controller may further register information on the newly discovered neighboring base stations or neighboring relay stations in the neighbor base station and neighbor relay stations management table. The method of claim 13, The message generator, And generating a broadcasting message for transmitting the updated neighbor base stations and neighboring relay stations information to terminals included in the service area of the relay station.

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