KR20070112987A - Method for operating data in mobile communication system and system thereof - Google Patents

Abstract

A data operation method in a mobile communication system and a system therefor are provided to enable exact channel estimation due to according a serving base station signal with an interference base station signal as a common zone is used in a data area, thereby effectively eliminating interference signals as estimating exact channel values. At least one base station allocates a frame which includes a common zone for an interference elimination function(801). A terminal confirms whether to use the common zone from the base station(803). The base station confirms whether the terminal is located in a cell border(805). If so, the base station first allocates a burst to the common zone, and transmits the burst to the terminal(807,809). The common zone is located at the end of the frame.

Description

METHOD FOR OPERATING DATA IN MOBILE COMMUNICATION SYSTEM AND SYSTEM THEREOF}

1 is a diagram showing a frame structure in a typical OFDMA system

2 illustrates an example of a frame structure used as a multi-zone in a conventional OFDMA system.

3 illustrates an example of a configuration of data carriers and pilot subcarriers in one cluster in an OFDMA system;

4 is a diagram illustrating a case where a terminal is located at a boundary with an adjacent base station in an OFDMA system

5 illustrates a channel model between a terminal having three base stations and two antennas;

6 and 7 illustrate a frame structure including a common zone in an OFDMA based communication system according to a preferred embodiment of the present invention.

8 is a flowchart illustrating a data processing method in a system using a common zone according to a preferred embodiment of the present invention.

9A to 9C illustrate frame structures used in a base station and a terminal that do not support the interference cancellation function according to an exemplary embodiment of the present invention.

10 is a flowchart illustrating an entry and handover process of a terminal in an OFDMA system

The present invention relates to a method and a system for canceling an interference signal in a mobile communication system, and more particularly, to a system and an operation method for canceling an interference signal in an orthogonal frequency division multiple access (OFDMA) system. It is about.

Currently, the IEEE 802.16 based OFDMA system WiBro system and WiMAX system are data communication systems that enable high-speed Internet on the go anytime and anywhere like mobile phones. Let's first look at WiBro / WiMAX.

1 is a diagram illustrating a frame structure in a typical OFDMA system. Basically, in the OFDMA system, the duplex method uses time division duplex (TDD). In FIG. 1, the vertical axis 101 represents a frequency band of a subcarrier and the horizontal axis 103 represents a time axis with an OFDMA symbol.

Referring to FIG. 1, one frame includes a downlink subframe 110 and an uplink subframe, each of which is a transmit transition gap (TGT) 130. It is divided into a receive transition interval (RTG) 140.

The preamble 111, which is the first symbol of the frame, is used for synchronization acquisition, base station ID acquisition, channel estimation, and the like. The frame control header (FCH) 112 contains decoding information of the MAP 113. That is, the MAP 113 can be decoded only by decoding the FCH 122. The MAP 113 is broadcast information in which each burst contains information such as a coding scheme, a location, a size, and the like, and must be decoded first in order for all terminals to decode a burst assigned to the terminal. When the MAP 113 is a normal MAP according to the IEEE802.16 standard, the MAP 113 is a DL-MAP including downlink burst information. In this case, the first burst (Burst # 1) 114 operates as a UL-MAP that contains uplink burst information. However, in the case of a compressed MAP, the MAP 113 includes both DL-MAP and UL-MAP. The MAP 113 is modulated by QPSK, has a code rate of 1/2 and can be repeated up to 6 times, thereby reducing the code rate to 1/12.

The frame of FIG. 1 has been described as an example of one zone, and can be divided into several zones in a scheduling method of an actual base station. This example will be described with reference to FIG. 2.

2 is a diagram illustrating an example of a frame structure used as a multi-zone in a conventional OFDMA system. Referring to FIG. 2, one frame includes a downlink subframe 210 and an uplink subframe 220 according to a method of configuring a pilot subcarrier and a data subcarrier (Partial Usage Sub-Carrier) 214, A FUSC (Full Usage Sub-Carrier) 215, band-AMC (Adaptive Modulation Coding) (216) may be divided into a plurality of zones. The allocation information of the zones is included in the DL-MAP and the UL-MAP, and one burst cannot be allocated over two or more different zones.

Here, the zones are different in data subcarrier number and pilot carrier number and position, respectively. 3 is a diagram illustrating an example of a configuration of data carriers and pilot subcarriers in one cluster in an OFDMA system. Referring to FIG. 3, the PUSC zones 214 and 222 are composed of data subcarriers 305 and pilot subcarriers 307 in one cluster. The data subcarrier 305 and the pilot subcarrier 307 exist in different positions.

The WiBro / WiMAX system as described above uses the same frequency at all base stations because the frequency reuse factor is 1 to increase frequency efficiency and facilitate network design. In the OFDMA system, as shown in FIG. 4, when the terminal 401 is located at a boundary with an adjacent base station, the following phenomenon occurs.

As shown in FIG. 4, in the cell boundary region, signals of neighboring base station signals 405 and 407 as well as signals of the serving base station 403 currently serving the terminal 401 are received in similar sizes. Since the signals of the neighbor base stations 405 and 407 act as interference signals, the reception carrier-to-interference-noise ratio (CINR) of the terminal 401 is lowered to 0 dB or less, so that the reception performance is reduced. Falls. For the same reason, the success rate of network entry accessing the initial base station and the inter-base station handover performance of the mobile terminal 401 are also poor. Therefore, in this case, in order to improve terminal reception performance, network entry success rate, and inter-base station handover performance in a cell boundary region, a technique for removing neighbor base station interference signals is required.

In order to remove such interference signals, various methods such as a minimum mean square error (MMSE) method are used. In such an interference cancellation technique, in order to cancel an interference signal of a neighboring base station, the channel value of the interference signal must be accurately estimated first.

In order to obtain such a channel estimate, the UE must coincide with the pilot position of the serving base station signal and the interference base station signal received by the antenna. However, the downlink subframe may have several zones as shown in FIG. 3, and the pilot positions are different for each zone. Since each base station independently schedules downlink subframes, there is a problem in that accurate channel estimates cannot be obtained because the zones of the serving base station and the interfering base station do not coincide. In particular, such a problem is that the handoff or network entry success rate is lowered, thereby degrading reception performance.

Accordingly, an object of the present invention is to provide a data operation method and system according to the OFDMA-based communication system for efficiently removing interference signals of neighboring base stations.

Another object of the present invention is to provide a data operating method and system according to the method for increasing handoff or network entry success rate in a cell boundary area in an OFDMA-based communication system.

Another object of the present invention is to provide a method of operating data and a system according to the system for implementing an interference cancellation function in an OFDMA-based communication system and a system that does not.

The present invention for achieving the above-mentioned is a method for operating data between the base station and the terminal in an Orthogonal Frequency Division Multiple Access (OFDMA) communication system comprising at least one base station and the terminal supporting the interference signal cancellation function The method may include: a first process of allocating a frame including a common zone for the interference cancellation function by the at least one base station, a second process of the terminal confirming whether the common zone is used by the base station; And a fourth process of the base station confirming whether the terminal is located at a cell boundary, and a fourth process of first assigning bursts to the common zone and transmitting the burst to the terminal if the terminal is in a cell boundary region.

According to the present invention for achieving the above, in an Orthogonal Frequency Division Multiple Access (OFDMA) communication system supporting an interference signal cancellation function, at least one base station is a common zone for the interference cancellation function. A base station for allocating a frame including a zone) and assigning a burst to the common zone and transmitting the burst when the terminal supporting the interference cancellation function is located in a boundary area, and in a step of Negotiate Basic Capabilities from the base station. At least one terminal for checking whether to use the common zone based on the information related to the common zone or a predetermined message of the handover, and removes the signal of the interfering base station using the common zone when located in the border area. It is characterized by.

DETAILED DESCRIPTION Hereinafter, detailed descriptions of preferred embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that the same components in the figures represent the same numerals wherever possible. Specific details are set forth in the following description, which is provided to aid a more general understanding of the invention. In the following description of the present invention, if 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.

The present invention proposes a data operation method and system according to the effective interference signal of the terminal. To this end, the present invention provides a common zone in which the zones of all base stations coincide in a certain area of a downlink subframe, and a method of improving reception performance by allocating bursts using a common zone to a terminal in a cell boundary region. Suggest.

First, for convenience of description, a case as shown in FIG. 5 will now be described in the MMSE which is an interference cancellation scheme used in the present invention. 5 shows a channel model between a terminal having three base stations and two antennas.

As shown in FIG. 5, when signals are received from one serving base station 501 and two interfering base stations 503 and 505 at two reception antennas 507 and 509 of the terminal, the following equation 1 is obtained. Can be modeled as:

Where y = [y _1, y ₂ ] ^T is the antenna reception signal of each of the terminals, and x = [x ₁ , x ₂ , x ₃ ] ^T is the serving base station 501 and the two interfering base stations 503, 505. Transmit signal, n = [N ₁ , N ₂ ] ^T is an additive white Gaussian noise (AWGN) noise signal, H is a channel from three base stations (501, 503, 505) to two terminal receive antennas (507, 509) The estimated value H is expressed by Equation 1 below. A ^T is the transpose of matrix A.

Estimates of the base station transmission signal x of the MMSE method are as shown in Equations 4 and 5 below.

은 잡음의 분산이고 I는 3x3 단일행렬, H^H 는 행렬 H의 헤미시안(Hermitian)이고, A^-1은 행렬 A의 역행렬이다.here

Is the variance of noise, I is a 3x3 single matrix, H ^H is the Hermitian of matrix H, and A ^-1 is the inverse of matrix A.

The channel estimate H from three base stations to two terminal receiving antennas can be obtained as follows. Under the assumption that there is no channel change in N pilot positions, when a signal is received from one serving base station and two interfering base stations, two models may be modeled as in Equation 5 below.

,

,

이고 P는 다음의 <수학식 6>과 같다.here

,

,

And P is as shown in Equation 6 below.

Here, p _ij is a pilot value received by the receiving antenna i from the base station j having a value of +1 or -1 and assumes that the matrix P is known because the terminal knows which base station is the base station through cell scanning in advance. . The channel estimate is calculated using the zero-forcing (ZF) algorithm as shown in Equation 7 below.

Referring to the above method, the pilot position of the serving base station signal 501 received at the antenna to establish a channel estimate value as shown in Equation 5 is established to remove the signal of the interference base station. It can be seen that and the pilot positions of the interfering base station signals 503 and 505 must match. However, since the zones of the interfering base stations do not match according to the scheduling of each base station, the pilot positions are different, and thus the interference signals cannot be removed.

In the case of MAP, since the channel value is estimated using the preamble or because all the base stations use the PUSC zone in accordance with the standard, the position of the pilot coincides to some extent and thus the channel value can be estimated. Accordingly, by using the estimated channel value, the interference signal may be removed as shown in Equations 3 and 4, thereby improving reception performance in the cell boundary region. However, improving the reception performance of the MAP does not improve the overall reception performance of the terminal, but should also improve the data reception performance other than the MAP.

Since the pilot positions of the serving base station and the interfering base station signal must coincide to remove the interference signal in the data area, in the present invention, the cell boundary is provided with a common zone in which the zones of all base stations match for accurate channel estimation. In the case of a terminal in a region, a burst is assigned to a common zone.

In addition, in the present invention, only the base station and the terminal supporting the interference cancellation function improve the reception performance of the terminal using the common zone, but maintain compatibility between the base station and the terminal that does not support this. In addition, the present invention proposes a method for allocating a burst to a terminal to be handed over to a network entry or handover in a cell boundary area using a common zone at a base station.

Accordingly, the present invention will be largely described in three cases. The first is a method of recognizing a base station and a terminal supporting a common zone. The second is a method of allocating a burst in a common zone to a terminal that needs network entry or handover in a cell boundary region. Third, a method of maintaining compatibility between a base station / terminal supporting a common zone and a base station / terminal not supporting.

FIG. 6 is a diagram illustrating a frame structure including a common zone in an OFDMA-based communication system according to a preferred embodiment of the present invention, and shows a frame structure of a serving base station and a neighbor base station.

Referring to FIG. 6, the preamble 601, the FCH 603, the MAP 605, and the conventional multi-zone 607 are configured differently for each base station, but in the present invention, a common zone 609 having the same location and size is allocated. By doing so, the terminal in the cell boundary region can effectively remove the interference signal. That is, since the UE knows the pilot position of the signal received at the serving base station and the signal received at the interfering base station by the common zone 609, it is possible to accurately estimate the channel value.

However, even if all of the base stations have allocated a common zone with the same location and size, if the UE does not recognize this, the interference signal cannot be removed normally. In addition, if the interference signal is removed from the terminal by setting a specific area of the downlink as a common zone based only on the promise between the specific base station and the terminal, the interference signal is assumed to be present even when the terminal operates in another base station. If it is removed, the terminal reception performance is rather deteriorated. That is, even when another terminal accesses the base station, it malfunctions.

In order to allocate a common zone based on the IEEE802.16e standard, the present invention utilizes an Adaptive Antenna System (AAS) Zone. The AAS zone is defined in the IEEE802.16e standard for smart antenna application but is excluded from the Mobile WiMAX profile, which is a base station and terminal implementation standard, so most base station and terminal manufacturers do not implement it. Therefore, the AAS zone is not used as a zone for smart antennas, but instead is used as a common zone for interference signal cancellation. In this case, since the terminal supporting the AAS zone recognizes that the AAS zone is a common zone commonly assigned to all base stations, the reception performance of the terminal can be improved by applying an interference signal cancellation technique when decoding the burst allocated to the AAS zone. . On the other hand, the terminal that does not support the AAS zone simply ignores this.

In order for all base stations to allocate an AAS zone as a common zone, OFDMA AAS_DL_IE must be included in the DL-MAP and transmitted in every frame. The AAS_DL_IE is shown in Table 1 below.

The OFDMA AAS_DL_IE in Table 1 is well known and only elements related to the present invention will be described herein.

In order to use the AAS zone as a common zone in the present invention, all base stations must match all field values except the DL PermBase field value in the OFDMA AAS_DL_IE.

In addition, when the AAS zone is not located at the end of the downlink subframe but is in the middle as shown in FIG. Since this field value is determined by, all base stations must match. The symbol offset value of the OFDMA_AAS_DL_IE indicates the start time 713 of the AAS zone, and the OFDMA symbol offset value of the OFDMA STC_DL_ZONE_IE indicates the start time 715 of the zone 711 after the AAS zone. 713) and the last point 715.

In the present invention, a reserved bit located at the end of OFDMA AAS_DL_IE can be further divided into a system applying an AAS zone to a smart antenna and a system applying interference cancellation of a terminal. For example, if the reserved bit is '0', the system may indicate an existing system for a smart antenna, and if it is '1', it may indicate a system for canceling the interference signal. Modulation and Coding Scheme (MCS) level of the burst assigned to the AAS zone also increases performance because all base stations match, and the interference cancellation cancellation algorithm can be applied to the successive interference cancellation (MMSE-SIC) method to improve performance instead of MMSE. You can. The MMSE-SIC method is disclosed in detail in the Korean patent application (P2006-7441) as a method of regenerating the interference signal to remove the regenerated interference signal from the received signal.

In order to apply the MMSE-SIC method, a reserved bit of the last OFDMA AAS_DL_IE may be used, or a reserved value in the Permutation field of OFDMA AAS_DL_IE may be used. For example, when the reserved bit is '0b110', the MCS of the AAS zone may be equal to the MCS of the PUSC, and when the reserved bit is '0b111', the MCS of the AAS zone may be identical to the AMC.

If all of the base stations have allocated a common zone to the downlink subframe using OFDMA AAS_DL_IE, an operation method for utilizing the common zone between the base station and the terminal is needed. Such an operation method should satisfy the IEEE802.16e standard so that compatibility problems between heterogeneous base stations and terminals do not occur. The following two cases should be considered in the operation method between the base station and the terminal. Firstly, whether the base station and the terminal support the common zone, and second, whether the terminal exists in the cell boundary region.

Hereinafter, a method of operating according to the use of a common zone according to the present invention will be described in detail with reference to FIG. 8, and then operations at each step will be described in detail.

8 is a flowchart schematically illustrating a method for allocating a burst of a terminal to a common zone in a system using a common zone according to a preferred embodiment of the present invention. Referring to FIG. 8, the serving base station allocates a common zone for channel estimation in step 801. Since the common zone allocation method has been described above as a method of allocating the common zone at the end or the middle of the frame as shown in FIGS. 6 and 7, the description thereof is omitted here. In step 803, the UE in the system recognizes whether a common zone is allocated in the Negotiate Basic Capabilities during network entry.

Here, since the entry and handover process of the terminal is shown in FIG. 10, it will be referred to in the following description. In FIG. 10, a part related to the present invention is a ranging and automatic adjustment (Ranging & uplink parameter adjustments) step 1005 and a basic capability negotiation (1007) and ranging upon entry after handover. And Ranging & uplink parameter adjustments (1019).

After recognizing whether the common zone is allocated, the serving base station determines whether the terminal on the network moves to the cell boundary region in step 805. The reason for confirming whether the UE is a cell boundary area is to determine whether to assign a burst to the common zone. Here, the case where the terminal is located in the cell boundary region means not only being located at the cell boundary but also handoff.

If there is a terminal located in the cell boundary region, as shown in step 807, the neighboring base station recognizes whether the common zone is allocated in the handoff process of the terminal. The common zone checking method of the terminal in the target base station will be described later. Neighboring base stations can easily remove the interference signal at the cell boundary area by transmitting a burst using a common zone in step 809.

On the other hand, if the terminal is not located in the cell boundary region in step 805, the process proceeds to step 811 to transmit the burst according to each base station.

Next, the common zone recognition method will be described in detail in steps 803 and 807. Here, a method of recognizing a common zone in the terminal and the base station will be described.

First, two methods for recognizing whether a terminal supports common zone are possible. The first method is to confirm using DL-MAP or UL-MAP, and the second method is to confirm during network entry. First, prior to the description of the network entry process and the handover process of the terminal briefly described related to the present invention. The above is briefly shown in FIG. 10 and will be referred to. Above

The first method is a method of checking whether there is OFDMA AAS_DL_IE or OFDMA AAS_UL_IE according to the present invention in DL-MAP or UL_MAP. That is, the UE can easily check using the reserved bits of the OFDMA AAS_DL_IE or the OFDMA AAS_UL_IE. The second method is a method of checking at the time of network entry of the terminal. Here, the UE checks whether a bit indicating whether to support the AAS zone is set to '1' in the SBC_RSP (Subscriber Basic Capabilities Response) message of the base station in the Negotiate Basic Capabilities (Negotiate Basic Capabilities) step when entering the network entry. You will be able to check. The SBC_RSP message is shown in Table 2 below.

 Table 2 shows the SBC_REQ message and the SBC_RSO message, and is not only known in the standard, but is not related to the gist of the present invention except for the AAS zone support bit.

Next, the base station determines whether the terminal supports the common zone can be divided into the case of network entry and the case of handover network reentry. The method is very similar and will be described together. First, as in the case of the terminal, it is checked whether the AAS Zone support bit of # 0 bit of Table 2 is set to '1' in the SBC_REQ message of the terminal in the basic capability negotiation step of the terminal's network entry process. Similarly, the handover network reentry process may check whether the AAS Zone support bit of # 0 bit of Table 2 is set to 1 in the SBC_REQ message of the UE. On the other hand, if the information is omitted in the Capability Negotiation step to reduce the handover time, it is determined whether the terminal supports the common zone from the previous serving base station.

Secondly, a separate CDMA ranging region is allocated to UL-MAP to recognize a terminal performing initial ranging in this region as a terminal supporting a common zone. When handover network reentry is applied to handover ranging instead of initial ranging. A specific method is to place UL-MAP_IE (UIUC = 12) after AAS_UL_IE for separate CDMA ranging in UL-MAP. However, since the actual AAS zone is not allocated to the uplink subframe, the OFDMA symbol offset value in the AAS_UL_IE shown in Table 3 below indicates the last symbol of the uplink subframe, and the AAS. Formal AAS zones of size 0 are assigned with the AAS Zone Length value set to '0'. Since UL-MAP_IE in a zone not supported by the IEEE802.16e standard is ignored, the terminal does not affect the common zone. In this case, the last reserved 1 bit of AAS_UL_IE shown in Table 3 may be used to distinguish the system from using the uplink AAS zone for the smart antenna. For example, when the reserved bit is '0', it may indicate a system for an existing smart antenna, and when it is '1', it may indicate a system for removing an interference signal.

Third, the RNG-RSP message of the base station is transmitted from the DL-MAP to the AAS zone in response to initial ranging of the terminal in the ranging & uplink parameter adjustments step 1019 of the terminal network entry process. After assigning to the RNG-RSP message and recognizes the terminal that sends the RNG-REQ message in response to the terminal to support the common zone. In the handover process, the above process may be applied to handover ranging instead of to initial ranging.

Next, a method of allocating a burst using a common zone by identifying cell boundary regions in steps 805 and 807 will be described.

A base station may utilize a common zone when allocating a burst to a terminal supporting a common zone, but in order to efficiently utilize the base station, the base station should first allocate the terminal to a terminal in a cell boundary region. Although FIG. 8 illustrates that only bursts are transmitted to terminals existing in a cell boundary region, bursts may be allocated to a common zone even to terminals not present in the cell boundary region according to priorities.

First of all, it is necessary to check whether the terminal is located in the cell boundary area. First, the UE periodically reports the carrier-to-interference-noise ratio (CINR) of the UE to the base station through a channel quality indicator channel (CQICH). It is determined that the cell boundary region. Second, it is determined that the terminal is in the cell boundary area immediately after confirming that the terminal supports the common zone in the network entry or handover network reentry process of the terminal. After that, the UE reports the CINR and continuously assigns the burst to the common zone until the value becomes larger than a specific threshold determined by the base station.

Third, the terminal is in the process of handover. When the serving base station initiates handover of the terminal, the burst is allocated to the common zone from the MOB_BSHO_REQ (Mobility Base Station Hand-Over Request) message of the serving base station until the terminal completes the handover. When the UE initiates handover, the serving base station again serves the MOB_HO-IND (Mobility Hand-Over Indication) message immediately after the serving base station receives the MOB_MSHO_REQ message. The burst may be assigned to the common zone until the base station receives it.

In the case of the target base station, the burst is allocated to the common zone from the moment of confirming whether the terminal supports the common zone in the handover network reentry process until the CINR value reported by the terminal becomes larger than a specific threshold determined by the target base station.

Next, a method of compatibility between a base station and a terminal that does not support the interference cancellation function will be described with reference to FIGS. 9A to 9C.

9A to 9C illustrate frame structures used in a base station and a terminal that do not support the interference cancellation function. 9A illustrates a frame structure used in a base station that does not support the interference cancellation function, and FIGS. 9B and 9C illustrate a frame structure used in an adjacent base station using the interference cancellation function.

Even when there are no terminals supporting the common zone among the terminals connected to the base station, allocating the common zone to the downlink subframe wastes the base station band. Therefore, in this case, instead of allocating a common zone as shown in FIG. 9A, a zone 911 is assigned in which only the permutation and the size are the same as the neighboring base station. As a result, the terminals connected to the adjacent base stations shown in FIGS. 9B and 9C do not interfere with the interference signal removal.

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, the present invention has an effect of effectively removing interference signals by enabling accurate channel estimation by using a common zone in the data region. That is, according to the present invention, the pilot position of the pilot signal of the serving base station signal and the interfering base station signal is primarily used to estimate an accurate channel value. In addition, by using the IEEE 802.16e standard AAS zone as a common zone, the base station and the terminal can easily determine whether to support the AAS during network entry or handover network reentry, and assigns bursts to the AAS zone only to terminals that support the AAS zone. Therefore, there is an effect that can improve the reception performance of the terminal at the time of network entry or handover. In addition, since the present invention satisfies the IEEE802.16e standard, compatibility problems between the base station / terminal and the unsupported base station / terminal do not occur.

Claims (10)

A method of operating data between a base station and a terminal in an orthogonal frequency division multiple access (OFDMA) communication system including at least one base station and a terminal supporting an interference signal cancellation function, A first step of the at least one base station allocating a frame including a common zone for the interference cancellation function; A second process of checking, by the terminal, whether the common zone is used from the base station; A third step of the base station confirming whether the terminal is located at a cell boundary; And a fourth process of first assigning bursts to the common zone and transmitting the bursts to the terminal if the terminal is in a cell boundary region. The method of claim 1, wherein the common zone, And at the end of the frame, a method of operating data between a base station and a terminal. The method of claim 1, wherein the common zone, Method of operating data between the base station and the terminal, characterized in that located in the middle of the frame. The method of claim 1, wherein in the second process, The method for confirming whether the terminal supports the common zone is based on the information of the common zone in the MAP information of the received frame transmitted from the base station. The method of claim 1, wherein in the second process The method for confirming whether the terminal supports the common zone is based on information indicating whether the common zone is allocated in the process of Negotiate Basic Capabilities during network entry. . The method of claim 1, wherein the third process comprises: And a base station confirms a carrier-to-interference-noise ratio (CINR) received from the terminal. The method of claim 1, wherein the third process comprises: And the base station confirms the network entry with the terminal. The method of claim 1, wherein the third process comprises: And the base station is confirmed by a predetermined message during a handover process with the terminal. The method of claim 1, If the terminal does not support the interference cancellation function, the base station allocates a zone having the same permutation and location as the common zone. In an Orthogonal Frequency Division Multiple Access (OFDMA) communication system supporting an interference signal cancellation function, A base station for allocating a frame including a common zone for the interference cancellation function and at least one base station assigning a burst to the common zone and transmitting the burst when the terminal supporting the interference cancellation function is located in a boundary area; , In the Basic Basic Capabilities negotiation step, the base station determines whether to use the common zone based on information related to the common zone or a predetermined message of handover, and if the user is located in a boundary area, using the common zone. And at least one terminal for removing a signal from an interfering base station.

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