KR100836029B1 - Initial ranging method and terminal and repeater in communication system - Google Patents

Abstract

In a communication system, a base station assigns a repeater identification number to the repeater. The repeater generates and manages a repeater PN code using the repeater identification number. The terminal receives the cell identification number and the repeater identification number from the base station and generates a base station PN code based on the cell identification number. Initial ranging is attempted to at least one of the base station and the repeater using the generated base station PN code as an initial ranging code. At this time, if the initial ranging using the base station PN code fails, the terminal generates a repeater PN code based on the repeater identification number and attempts initial ranging to the repeater. In this case, when the terminal located at the position where the repeater region and the base station region overlap with each other attempts initial ranging, both the repeater and the base station do not succeed in initial ranging, thereby preventing resource allocation of the base station.

Description

Initial ranging method and terminal and repeater in communication system {METHOD FOR INITIAL RANGING AND ACCESS TERMINAL AND REPEATER IN COMMUNICATION SYSTEM}

1 is a view schematically showing a communication system according to an embodiment of the present invention.

2A is a schematic diagram of an AT 100 according to an embodiment of the present invention.

2B is a diagram illustrating a base station PN code and a repeater PN code.

3 is a schematic diagram of a repeater 140 according to an embodiment of the present invention.

4 is a diagram illustrating a base station area and a repeater area in a communication system according to an exemplary embodiment of the present invention.

5 is a flowchart illustrating a ranging method when the AT 110a is located in a base station area.

6 is a flowchart illustrating a ranging method when the AT 110b is located in an area where the base station area and the repeater area overlap.

7 is a flowchart illustrating a ranging method when the AT 110c is located in the relay region.

 The present invention relates to an initial ranging method of a terminal in a communication system including a repeater.

Recently, with the increase of users who want to transmit and receive data while moving, a communication system such as a wireless Internet system (WiBro: Wireless Broadband or HPI: High-speed Portable Internet) based on a broadband wireless access network has been provided.

The IEEE 802.16 based portable Internet system is a 3.5 generation mobile communication system that provides various types of IP-based wireless data services provided by the wired Internet by using a wireless transmission technology that guarantees spectrum use efficiency in the 2.3 GHz frequency band. to be.

In such a portable Internet system, a terminal performs a ranging procedure with a base station to obtain uplink synchronization and adjust transmission power. In this case, the terminal performs ranging using a broadcast message transmitted through the downlink from the base station. In particular, the terminal generates a pseudorandom noise (PN) code using a cell identification number (Cell_ID) included in the broadcast message. Then, initial ranging is attempted using the PN code.

Meanwhile, in the portable Internet system, a repeater plays a role of relaying a signal of a terminal to improve cell coverage. However, when the terminal existing in the common area of the base station and the repeater performs ranging, both the base station and the repeater may perform the ranging operation with the terminal. Then, the base station allocates information for establishing synchronization to the terminal and the repeater. That is, the terminal located in the region where the base station region overlaps with the base station region succeeds in both initial ranging with the base station and initial ranging with the repeater. As a result, the terminal requests radio resources directly to the base station, and requests another radio resource through the repeater. Accordingly, the portable Internet system has a problem in that the radio resources of the base station and the radio resources of the repeater are allocated to one terminal in duplicate, and the base station is confused with the radio resource allocation schedule.

An object of the present invention is to provide an initial ranging method, a terminal, and a repeater in a communication system capable of preventing redundant allocation of radio resources and preventing confusion of resource allocation schedules of base stations.

According to an embodiment of the present invention, a repeater for relaying a signal between a terminal and a base station in a communication system is provided. The repeater generates a repeater PN code value based on the receiver receiving the repeater identification number from the base station and the repeater identification number, and upon receiving the initial ranging request from the terminal, the code value included in the initial ranging request. A ranging signal analyzer comparing the repeater PN code value with the repeater PN code value, and when the code value included in the initial ranging request and the repeater PN code value match, the initial ranging response for the initial ranging is transmitted to the terminal. And a ranging processor. In this case, the initial ranging response includes information for establishing synchronization between the base station and the terminal.

According to another embodiment of the present invention, a method for performing initial ranging in a relay that relays a signal between a terminal and a base station in a communication system is provided. The ranging method includes: receiving a repeater identification number from the base station, generating a repeater PN code value based on the repeater identification number, receiving a ranging request including a code value from a terminal, and the code value Determining whether an initial ranging response to the initial ranging request is determined, and if the initial ranging response is determined, transmitting the initial ranging response to the terminal.

According to another feature of the present invention, there is provided an initial ranging method of a terminal for establishing synchronization with the base station in a communication system including a repeater and a base station. The initial ranging method includes receiving a cell identification number and a repeater identification number from the base station, generating a first initial ranging code based on the cell identification number, and using the first initial ranging code. Attempting initial ranging with at least one of a repeater and the base station; generating a second initial ranging code based on the repeater identification number if initial ranging using the first initial ranging code fails; And attempting initial ranging with the repeater using the second initial ranging code. In this case, the repeater and initial ranging are successful during initial ranging using a second initial ranging code.

According to another feature of the present invention, a terminal for performing initial ranging for synchronization setting with the base station in a communication system including a repeater and a base station is provided. The terminal includes a receiver for receiving a cell identification number and a repeater identification number from the base station, a first code generator for generating a base station PN code based on the cell identification number, and at least one of the repeater and the base station using the base station PN code. A first ranging processor attempting initial ranging with a second code generator, a second code generator generating a repeater PN code based on the repeater identification number when the initial ranging fails with the base station PN code, and the repeater PN code It includes a second ranging processor for attempting ranging with the base station using. At this time, the initial ranging with the repeater is successful during initial ranging using the repeater PN code.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification and claims, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components, unless specifically stated otherwise. Each block represents a unit for processing a specific function or operation, which may be implemented in hardware or software, or a combination of hardware and software.

Now, an initial ranging method, a terminal, and a repeater in a communication system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Although an embodiment of the present invention has been described taking an IEEE 802.16 based communication system as an example, the embodiment of the present invention may be applied to other communication systems.

1 is a view schematically showing a communication system according to an embodiment of the present invention.

As shown in FIG. 1, a communication system includes a terminal (Access Terminal, hereinafter referred to as "AT") 110, a base station (Access Point, hereinafter referred to as "AP") 120, a packet access router, (Hereinafter referred to as "PAR") 130 and repeater 140.

The AT 110 communicates with the AP 120 according to a wireless access standard.

The AP 120 is a device for connecting a wireless network and a wired network. The AP 120 transmits information received from the AT 110 to the PAR 130 or conversely, converts information received from the PAR 130 into a wireless signal and converts the information received from the AT 110 into a wireless signal. It performs the function of transmitting to. A wireless packet data service is provided to the AT 110 through a wireless interface at a wired network end. For this function, the AP 120 accesses a base band subsystem (BBS) 121, an access traffic subsystem 122 (ATS) 122, and access. Access Control Subsystem (hereinafter referred to as “ACS”) 123 and Ethernet Switch 124. The BBS 121 performs modulation and demodulation signal processing on the packet traffic and performs a function of transmitting and receiving packet traffic in a wireless section. The ATS 122 receives the cell information of the AP 120 and the connection information of the AT 110 from the ACS 123 in cooperation with the ACS 123 and the BBS 121 to perform a traffic processing and scheduling function. In consideration of the state of the 110, the scheduled downlink packet is transmitted to the BBS 121 to request transmission of the wireless section to the AT 110, or by processing the uplink packet received from the AT 110 Ethernet switch 124 ) To deliver to the PAR (130). The ACS 123 performs management and cell management of the AT 110. The Ethernet switch 124 performs an interface function that connects the AP 120 with the PAR 130.

The PAR 130 is connected to the plurality of APs 120 to manage the plurality of APs 120 and performs a handover control function in the PAR 130.

The repeater 140 relays or amplifies a signal from the AT 110 and transmits the signal to the AP 120.

2A is a schematic diagram of an AT 100 according to an embodiment of the present invention, and FIG. 2B is a diagram illustrating a base station PN code and a repeater PN code.

As shown in FIG. 2A, the AT 110 includes a receiver 111, a first code generator 112, a first ranging processor 113, a second code generator 114, and a second ranging processor ( 115).

The receiver 111 receives the cell identification number Cell_ID and the relay identification number RS_ID from the AP 110.

The first code generator 112 generates a base station PN code based on the cell identification number (Cell_ID) received from the AP 120. Here, the generated base station PN code is used as an initial ranging code. At this time, the base station PN code is generated by a cell identification number (Cell_ID) of "00001011" and 7 bits ([s6: s0]).

The first ranging processor 113 attempts initial ranging with at least one of the AP 120 and the repeater 140 using the base station PN code as the initial ranging code.

The second code generator 114 generates the repeater PN code based on the repeater identification number RS_ID when the initial ranging using the base station PN code fails in the first ranging processor 113. Here, the generated repeater PN code is also used as the initial ranging code. That is, as shown in FIG. 2B, the second code generator 114 sets the most significant four-bit digit of the base station PN code "00001011" as the number of repeaters, and attaches "1011" and a cell identification number (Cell_ID) to the repeater PN. Generate the code. That is, when generating the base station PN code, the most significant 4 bits become "0000", and when generating the repeater PN code, the most significant 4 bits start from "0001" and increase the most significant 4 bits according to the number of repeaters to repeat the relay PN code of each repeater. Create For example, when three repeaters are included in one AP 120, the base station PN code initial value may be generated as {"0000" & "1011" & Cell_ID (7 bits)}, and the repeater PN code initial value may be generated. The values are {"0001" & "1011" & Cell_ID (7 bits)}, {"0010" & "1011" & Cell_ID (7 bits)} and {"0011" & "1011" & Cell_ID (7 bits)} Can be generated.

The second ranging processor 115 attempts ranging with the repeater 140 using the repeater PN code. When the ranging with the repeater 140 succeeds, the terminal 120 receives information for synchronization setting from the AP 120 and transmits the information to the AT 110.

3 is a schematic diagram of a repeater 140 according to an embodiment of the present invention.

As shown in FIG. 3, the repeater 140 includes a receiver 141, a ranging signal analyzer 142, and a ranging processor 143.

The receiver 141 receives the repeater identification number RS_ID from the AP 120.

The ranging signal analysis unit 142 generates a repeater PN code value based on the repeater identification number RS_ID. When the ranging signal is requested from the AT 110 by the initial ranging code, the ranging signal analysis unit 142 is used as the initial ranging code. Compare the code value (base station PN code value or repeater PN code value) with the generated repeater PN code value.

If the PN code value received from the AT 110 matches the repeater PN code value, the ranging processor 143 requests the initial ranging from the AP 120 and a response message for the initial ranging request from the AP 120. Receives and forwards to the AT (110). In this case, the response message includes information for establishing a synchronization with the AP 120.

Next, the ranging method according to an embodiment of the present invention will be described in detail with reference to FIGS. 4 to 7.

4 is a diagram illustrating a base station area and a repeater area in a communication system according to an exemplary embodiment of the present invention. 5 is a flowchart illustrating a ranging method when the AT 110a is located in the base station area, and FIG. 6 is a flowchart illustrating a ranging method when the AT 110b is located in an overlapping area of the base station area and the repeater area. . 7 is a flowchart illustrating a ranging method when the AT 110c is located in the relay region.

As shown in FIG. 4, in the communication system, the base station area 120a and the repeater 140b area are divided. When the base station area 120a and the repeater 140b area are divided, the AT 110a positioned in the base station area 120a may communicate with the AP 120 without passing through the repeater 140. However, the AT 110b located in an area where the base station area 120a and the repeater area 140b overlap with each other may directly communicate with the AP 120 or communicate with the AP 120 through the repeater 140. Can be done. The AT 110c located in the repeater region 140b may communicate with the AP 120 only through the repeater 140.

First, as shown in FIG. 5, the AT 110a located in the base station area 120a starts a cell selection operation when it is initially powered on. That is, the AT 110a monitors all preset frequency bands to detect a pilot signal having the largest size, for example, the largest carrier to interference and noise ratio (hereinafter referred to as "CINR"). do. The AT 110a receives a preamble of a downlink frame from the AP 120 that transmits the pilot signal having the maximum CINR to obtain system synchronization with the AP 120.

When the AT 110a acquires system synchronization between the AP 120, the AP 120 transmits a DL-MAP (Downlink MAP) message, an UL-MAP (Uplink-MAP) message to the AT 110a and the relay 140, and Downlink Channel Descript (hereinafter referred to as "DCD") Message, Uplink Channel Descript (hereinafter referred to as "UCD") Message and Neighbor AdvertisementADV (hereinafter referred to as "NBR-ADV") Transmit a broadcast message including the message (S500, S502). At this time, the AP 120 transmits the base station identification number (Cell_ID) and the relay identification number (RS_ID) assigned to the repeater 200 through the MAP to the AT (110a).

The AT 110a generates a base station PN code, that is, an initial ranging code, by using the base station identification number (Cell_ID) obtained from the broadcast message, and competes with the initial ranging code generated by the AP 120. Attempts initial ranging by transmitting to S504.

Upon receiving the initial ranging code from the AT 110a, the AP 120 broadcasts a ranging response message (hereinafter referred to as "RNG-RSP") to the AT 110a for the initial ranging attempt ( SS506). In this case, the RNG-RSP message includes initial ranging code information and a power offset adjustment value transmitted by the AT 110a.

Upon receiving the RNG-RSP message from the AP 120, the AT 110a checks the initial ranging code information, adjusts the power offset, and the initial lane when the status field of the RNG-RSP message is continuous. Retry the gong (S508).

When the AP 120 determines that timing and power adjustment have been performed through the initial ranging attempted by the AT 110a, the AP 120 marks the status field of the RNG-RSP message as success to the AT 110a. It transmits (S510).

The AP 120 allocates an uplink interval through which the AT 110a can transmit a ranging request (hereinafter, referred to as "RNG-REQ") message through the UL-MAP having the CDMA_Allocation_IE (S512). At this time, the CDMA_Allocation_IE includes the uplink resource amount allocated to the AT 110a together with initial ranging code information transmitted by the AT 110a. That is, the AT 110a performs an initial ranging process with the AP 120 through steps S504 to S512.

Subsequently, the AT 110a performs message ranging with the AP 120. That is, the AT 110a transmits an RNG-REQ message to the AP 120 in the allocated uplink period (S514). Here, the RNG-REQ message may be a basic connection identifier (hereinafter referred to as a "basic CID"), a first management CID and a media access control (hereinafter referred to as "MAC") of the AT 110a. Address is included.

Upon receiving the RNG-REQ message from the AT 110a, the AP 120 transmits the RNG-RSP message to the AT 110a (S516). The RNG-RSP message includes basic CID information and uplink synchronization information.

Upon receiving the RNG-RSP message, the AT 110a acquires uplink synchronization information, and completes ranging by adjusting resource setting, that is, frequency and power, with a basic CID.

Thereafter, the AT 110a transmits a basic capability request (hereinafter referred to as "SBC-REQ") message to the AP 120 (S518). The SBC-REQ message is a MAC message transmitted by the AT 110a to negotiate basic performance with the AP 120. The SBC-REQ message includes a modulation and coding scheme that the AT 110a can support. Contains information about.

After receiving the SBC-REQ message from the AT 110a, the AP 120 checks the modulation and coding scheme supported by the AT 110a included in the SBC-REQ message, and then sends a basic message as a response message to the SBC-REQ message. A capability response (Subscriber Station Basic Capability Response, hereinafter referred to as "SBC-RSP") message is transmitted to the AT 110a (S520).

AT 110a completes the basic performance negotiation of AT 110a by receiving the SBC-RSP message.

Subsequently, the AT 110a transmits a Encryption Key Management Request (PKM-REQ) message to the AP 120 (S522). The PKM-REQ message is a MAC message for authentication of the AT 110a and includes unique information of the AT 110a.

The AP 120 receiving the PKM-REQ message performs authentication with an authentication server (not shown) with the unique information of the AT 110a. The AP 120 transmits an encryption key management response (PKM-RSP) message to the AT 110a as a response to the PKM-REQ message when the authentication dl of the AT 110a is completed. (S524). At this time, the PKM-RSP message includes an authentication key (AK) and an encryption key (TEK) assigned to the AT 110a.

Upon receiving the PKM-RSP message from the AP 120, the AT 110a transmits a registration request (hereinafter referred to as "REG-REQ") message to the AP 120 (S526). At this time, the REG-REQ message includes the registration information of the AT (110a). Subsequently, the AP 120 detects the registration information included in the REG-REQ message to register the AT 110a and allocate a second management CID (secondary management CID). The AP 120 transmits a registration response (REG-RSP) message, which is a response message to the REG-REQ message, to the AT 110a (S528). At this time, the REG-RSP message includes the allocated second management CID and registration information.

AT (110a) completes its registration from the REG-RSP message and at the same time obtains a second management CID, the Internet connection (hereinafter referred to as "IP") connection is made through the AP 120, Operation information is downloaded via the connected Internet protocol (S530).

Thereafter, a service flow between the AT 110a and the AP 120 is connected (S532). The service flow refers to a flow through which MAC-SDUs are transmitted and received through an access having a certain quality of service (QoS). When the service flow between the AT 110a and the AP 120 is connected, the service between the AT 110a and the AP 120 starts to be performed (S534).

As such, the AT 110a located in the base station area 120a attempts ranging by using the base station PN code, and performs initial ranging with the AP 120 that receives the ranging. In this case, since the radio wave environment is not transmitted out of the base station area 120a, resources are not allocated through the repeater 140.

Next, as shown in FIG. 5, the AT 110b located in an area where the base station area 120a and the repeater area 140b overlap with each other is obtained when the system synchronization is acquired between the AP 120 and the AP 120 and the repeater. A broadcast message including a DL-MAP (DL-MAP) message, an UL-MAP (Uplink-MAP) message, a DCD message, a UCD message, and a neighboring AP NBR-ADV message is transmitted to 140 (S600 and S602). At this time, the AP 120 transmits the cell identification number (Cell_ID) and the repeater identification number (RS_ID) to the AT (110b) through the MAP.

The AT 110b generates a base station PN code, that is, an initial ranging code, by using the cell identification number (Cell_ID) obtained from the broadcast message of the AP 120, and transmits the initial ranging to the AP 120 and the relay 140. Attempts are made (S604. S604 '). The repeater 140 compares the repeater PN code with the initial ranging code received from the AT 110b. At this time, since the initial ranging code is the base station PN code, the repeater 140 fails to detect the PN code (S605), and does not perform the initial ranging process for the AT 110b.

The AP 120 receiving the initial ranging code from the AT 110b adjusts initial ranging code information and power offset transmitted by the AT 110b in an RNG-RSP message for the initial ranging attempt of the AT 110b. The value is displayed and broadcasted (S606).

Upon receiving the RNG-RSP message from the AP 120, the AT 110b checks the initial ranging code information and adjusts the power offset, and the initial lane when the status field of the RNG-RSP message is continuous. Retry the gong (S608).

When the AP 120 determines that timing and power adjustment have been made through the initial ranging attempted by the AT 110b, the AP 120 marks the status field of the RNG-RSP message as success and transmits it (S610). .

The AP 120 allocates an uplink interval through which the AT 110b can transmit an RNG-REQ message through UL-MAP having CDMA_Allocation_IE (S612).

When the initial ranging process between the AT 110b and the AP 120 is completed, subsequent steps S614 to S are performed in the same manner as described with reference to FIG. 4.

As such, the AT 110b positioned in the region where the base station region 120a and the repeater region 140b overlap with each other may be initially ranged with the repeater 140, but the AT 110b preferentially uses the base station PN code. Since the initial ranging is attempted, the initial ranging fails with the repeater 140 having the repeater PN code value. That is, by managing the AT 110b located in an area where the base station area 120a and the repeater area 140b overlap with each other by the AP 120, it is possible to prevent duplicate resource allocation through the repeater 140.

As shown in FIG. 7, the AT 110c located in the repeater region 140b starts a cell selection operation when it is initially powered on. That is, the AT 110c monitors all preset frequency bands to detect a pilot signal having the largest size, for example, the largest CINR.

The AT 110c receives a preamble of a downlink frame from the AP 120 through the relay 140 transmitting the pilot signal having the maximum CINR, thereby obtaining system synchronization with the repeater 140.

When the AT 110c acquires system synchronization between the repeaters 140, the AT 110c receives a DL-MAP (Downlink MAP) message and an UL-MAP (Uplink-MAP) message from the AP 120 via the repeater 140. A broadcast message including a DCD message, a UCD message, and a neighboring AP NBR-ADV message is received (S700, S702). At this time, the AP 120 transmits the cell identification number (Cell_ID) and the relay identification number (RS_ID) to the AT (110c) through the MAP.

The AT 110c generates a base station PN code, that is, an initial ranging code, by using the cell identification number Cell_ID obtained from the broadcast message of the AP 120, and generates an initial lane generated by the AP 120. By transmitting the gong code in a competitive manner to attempt the initial ranging to the repeater 140 (S704).

The repeater 140 compares the repeater PN code with the initial ranging code received from the AT 110c. At this time, since the initial ranging code is the base station PN code, the repeater 140 fails to detect the PN code (S705) and does not perform the initial ranging process for the AT 110b. In addition, since the AP 120 does not receive an initial ranging attempt from the AT 110c, the AP 120 also cannot perform an initial ranging process for the AT 110c.

The AT 110c attempts initial ranging by generating a repeater PN code using the repeater identification number RS_ID since the initial ranging attempt was not successful (S706). In this case, when any one of the repeaters and the initial ranging fails, the AT 110c may retry initial ranging by the number of repeater identification numbers RS_IDs included in the broadcast message.

Repeater 140, the initial ranging attempt of the AT (110c), the time and frequency between the repeater 140 and the AT (110c) via a repeater ranging request (hereinafter referred to as "RS-RNG-REQ") message The offset and the transmit power are reported to the AP 120 (S708).

Then, the AP 120 displays the initial ranging code information and the power offset adjustment value transmitted by the AT 110c in the RNG-RSP message and broadcasts it to the repeater 140 (S710), and the repeater 140 broadcasts the RNG. -Send an RSP message to the AT (110c) (S712).

Upon receiving the RNG-RSP message from the AP 120 through the relay 140, the AT 110c checks initial ranging code information and adjusts a power offset, and the status field of the RNG-RSP message is continuous ( continue), initial ranging is retried (S714).

When the AP 120 determines that timing and power adjustment have been made through the initial ranging attempted by the AT 110c, the AP 120 marks the status field of the RNG-RSP message as success to indicate the repeater 140. It transmits to the AT (110c) (S716 ~ S720).

The AP 120 allocates an uplink interval through which the AT 110c can transmit an RS-RNG-REQ message through the repeater 140 through UL-MAP having CDMA_Allocation_IE (S722 to S724).

When the initial ranging process between the AT 110c and the AP 120 is completed, the flow thereafter is performed through the repeater 140 similarly to that described with reference to FIG. 4 (S726 ˜).

As such, since the AT 110c located in the repeater region 140b can be initially ranging only through the repeater 140, when the initial ranging is attempted using the base station PN code, the repeater 140 and the initial lane are initially initialized. Gong will fail. Subsequently, when the AT 110c attempts initial ranging using the repeater PN code, the AT 110c and the initial ranging succeed. At this time, the AT 110c may check the correct repeater identification number RS_ID.

The embodiments of the present invention described above are not implemented only through an apparatus and a method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. From the description of the above-described embodiment can be easily implemented by those skilled in the art.

In addition, the scope of the present invention is not limited to the above-described embodiments, but various modifications and variations of those skilled in the art using the basic concept of the present invention as defined in the following claims also belong to the scope of the present invention.

As described above, according to an exemplary embodiment of the present invention, even when a base station and a repeater are located in a terminal capable of initial ranging, duplicate resource allocation through the repeater can be prevented.

Claims (15)

In the repeater for relaying signals between the terminal and the base station in a communication system, A receiver for receiving a repeater identification number from the base station, A repeater generates a Pseudorandom Noise (PN) code value based on the repeater identification number and, upon receiving an initial ranging request from the terminal, compares a code value included in the initial ranging request with the repeater PN code value. Gong signal analyzer, and A ranging processor for transmitting an initial ranging response for the initial ranging to the terminal when the code value included in the initial ranging request and the repeater PN code value match. Including; And the initial ranging response includes information for establishing synchronization between the base station and the terminal. The method of claim 1, The ranging processing unit, And repeating the request for the initial ranging to the base station and receiving the initial ranging response from the base station and transmitting the initial ranging response to the terminal. The method of claim 2, The ranging processing unit, The repeater does not respond to the ranging request to the terminal when the code value and the repeater PN code value do not match. A method for performing initial ranging in a relay that relays a signal between a terminal and a base station in a communication system, Receiving a repeater identification number from the base station, Generating a repeater PN code value based on the repeater identification number; Receiving a ranging request including a code value from a terminal; Determining an initial ranging response to the initial ranging request from the code value, and Transmitting the initial ranging response to the terminal when the initial ranging response is determined. Initial ranging method comprising a. The method of claim 4, wherein The determining of the initial ranging response, Comparing the code value with the repeater PN code value, and Determining the ranging response transmission when the code value and the repeater PN code value match. Initial ranging method comprising a. The method of claim 5, Transmitting the initial ranging response to the terminal, Requesting the initial ranging to the base station, and Receiving the ranging response including information for establishing synchronization between the base station and the terminal from the base station and transmitting the ranging response to the terminal; Initial ranging method comprising a. An initial ranging method of a terminal for establishing synchronization with the base station in a communication system including a repeater and a base station, Receiving a cell identification number and a repeater identification number from the base station; Generating a first initial ranging code based on the cell identification number; Attempting initial ranging with at least one of the repeater and the base station using the first initial ranging code, Generating a second initial ranging code based on the repeater identification number when initial ranging using the first initial ranging code fails; and Attempting initial ranging with the repeater using the second initial ranging code Including; The initial ranging method in which the repeater and the initial ranging succeed in initial ranging using the second initial ranging code. The method of claim 7, wherein Receiving information for establishing synchronization with the base station from the base station when initial ranging with the base station succeeds using the first initial ranging code. Initial ranging method further comprising. The method of claim 7, wherein Receiving information for establishing synchronization with the base station from the repeater when ranging with the repeater is successful; Initial ranging method further comprising. The method according to any one of claims 7 to 9, And the terminal is located in an area where an area formed by the base station and an area formed by the repeater overlap. The method according to any one of claims 7 to 9, The first initial ranging code is generated based on "00001011" and the cell identification number. Generating the second initial ranging code, Confirming the number of repeaters from the repeater identification number, Concatenating the lower four bits " 1011 " and the cell identification number in " 00001011 " Generating a second initial ranging code of a corresponding repeater by increasing the upper 4 bits according to the number of repeaters from "0001" in the upper 4 bits in "00001011"; Initial ranging method comprising a. The method of claim 11, Repeatedly attempting the initial ranging by using the second initial ranging codes generated by the number of repeaters until the initial ranging is successful. Initial ranging method further comprising. A terminal for performing initial ranging for synchronization setting with the base station in a communication system including a repeater and a base station, A receiver for receiving a cell identification number and a repeater identification number from the base station; A first code generator configured to generate a base station PN (Pseudorandom Noise) code based on the cell identification number; A first ranging processor for initial ranging with at least one of the repeater and the base station using the base station PN code; A second code generator for generating a repeater PN code based on the repeater identification number when the initial ranging fails with the base station PN code; and A second ranging processor that attempts ranging with the base station using the repeater PN code; Including; The terminal and the initial ranging is successful when the initial ranging using the repeater PN code. The method of claim 13, The second code generator, Confirming the number of repeaters from the repeater identification number, and generating the repeater PN code corresponding to the identified number of repeaters. The method of claim 14, The second ranging processing unit, The terminal attempts initial ranging by using the generated relay PN code until the initial ranging is successful.

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