KR101359840B1 - Apprarus and method for allocating resource in communication system using ofdm - Google Patents

Abstract

In the method for allocating resources in the wireless communication system proposed by the present invention, the method of allocating a resource allocation pattern of a corresponding cell by using an identifier for each cell and an identifier of sectors constituting the corresponding cell, and determining the determined resource for the corresponding cell Allocating a resource according to the allocation pattern.

Zone based hopping, resource allocate, resource mapping, 3G LTE.

Description

APPARATUS AND METHOD FOR ALLOCATING RESOURCE IN COMMUNICATION SYSTEM USING OFDM}

The present invention relates to an apparatus and method for arranging resources in a communication system using an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and more particularly, to a resource arrangement of a physical channel in a communication system using an OFDM scheme and An apparatus and method for the transmission of data via the same.

Recently, in the mobile communication system, orthogonal frequency division multiplexing has been actively studied as a method useful for high-speed data transmission in wired and wireless channels. The OFDM method is a method of transmitting data using a multi-carrier. A plurality of frequency tones having mutual orthogonality, i.e. It is a type of multi-carrier modulation (MCM) that modulates and transmits a plurality of sub-carrier channels.

Such a system using a multicarrier modulation scheme was first applied to military high frequency radios in the late 1950s, and the OFDM scheme of overlapping a plurality of orthogonal subcarriers started to develop in the 1970s, but the implementation of orthogonal modulation between multicarriers was implemented. Since this was a difficult problem, there was a limit to the actual system application. However, in 1971, Weinstein et al. Announced that modulation and demodulation using the OFDM scheme can be efficiently processed using a Discrete Fourier Transform (DFT). In addition, the use of guard intervals and the introduction of cyclic prefix symbols (CPs) into the guard intervals further reduce the negative effects of the system on multipath and delay spread. Was made.

Thanks to these technological developments, the OFDM-based technologies are used for digital audio broadcasting (DAB) and digital video broadcasting (DVB), wireless local area network (WLAN), and wireless asynchronous transmission mode ( It is widely applied to digital transmission technology such as wireless asynchronous transfer mode (WATM). In other words, the OFDM method is not widely used due to hardware complexity, and recently, various digital signal processing techniques including fast Fourier transform (FFT) and inverse fast Fourier transform (IFFT) have been introduced. It has been commercialized by development.

The OFDM scheme is similar to the conventional frequency division multiplexing (FDM) scheme, but has a characteristic of obtaining optimal transmission efficiency in high-speed data transmission by maintaining orthogonality between a plurality of tones. . In addition, the OFDM scheme has good frequency usage efficiency and is strong in multi-path fading, so that an optimum transmission efficiency can be obtained in high-speed data transmission. Another advantage of the OFDM scheme is that the frequency spectrum is superimposed so that it is efficient to use the frequency, is strong in frequency selective fading, is strong in multipath fading, and intersymbol interference (ISI) using a guard interval. It is possible to reduce the influence of symbol interference, to easily design an equalizer structure in hardware, and to be strong in impulsive noise, so it is actively used in a communication system structure. Is in.

The factors that hamper high-speed, high-quality data services in wireless communication are largely due to the channel environment. In the wireless communication, the channel environment includes a Doppler due to power change, shadowing, movement of the terminal, and frequent speed change of the received signal caused by fading in addition to additive white Gaussian noise (AWGN). Doppler) effects, interference with other users and multipath signals are often changed. Therefore, in order to support high speed and high quality data services in wireless communication, it is necessary to effectively overcome the above-mentioned obstacles.

In the OFDM scheme, a modulated signal is located in a two-dimensional resource composed of time and frequency. The resources on the time base are divided into different OFDM symbols and they are orthogonal to each other. On the other hand, resources on the frequency axis are distinguished by different tones, and they are also orthogonal to each other. That is, in the OFDM scheme, if a specific OFDM symbol is designated on the time axis and a specific tone is designated on the frequency axis, it may indicate one minimum unit resource, which is called a frequency-time resource (bin). Since different frequency-time bins are orthogonal to each other, signals transmitted to different frequency-time bins can be received without interfering with each other.

A physical channel is a channel of a physical layer that transmits a modulation symbol that modulates one or more encoded bit streams. In Orthogonal Frequency Division Multiple Access (OFDMA) systems, a plurality of physical channels are configured and transmitted according to the purpose of the information string to be transmitted or the receiver. Transmitter and receiver have to promise in advance which frequency-time bin a single physical channel is placed and transmit. The rule is called mapping.

The mapping method can be changed according to the operation characteristics of a specific physical channel. When the transmitter is aware of the state of a receiving channel and the physical channel is mapped using a scheduler to improve the transmission efficiency of the system, the channel state is similar. One physical channel is placed in a set of frequency-time bins. In addition, when a physical channel is mapped for the purpose of lowering a reception error rate when a transmitter does not recognize a state of a reception channel, it is preferable to place one physical channel in a set of frequency-time bins in which channel states are expected to be very different. desirable. The former method is suitable for transmitting data for a user as long as it is not sensitive to latency. The latter method is mainly used for data or control information for a user as long as it is sensitive to latency, or for data transmitted to multiple users. It is suitable for transmitting control information. Like the latter method, the use of resources having different channel states is intended to obtain diversity gain. In an OFDM symbol, the frequency diversity gain can be obtained by mapping to a subcarrier as far as possible on the frequency axis.

In a cellular OFDMA system, inter-cell interference is another factor in determining communication performance. In order to reduce interference between cells, it is preferable to design the mapping of the physical channel to be orthogonal between cells. However, when the mapping rule is defined based on orthogonality, the number of orthogonal physical channels within a given bandwidth is limited. This means that the number of cells that are guaranteed orthogonality is limited, so that interference from cells that do not belong to the set of orthogonality cells is rather increased. To solve this problem, a method of increasing the number of orthogonal physical channels while reducing interference between cells is required.

1 is a diagram illustrating physical channels disposed at equal intervals on a frequency axis to obtain frequency diversity gain.

Reference numerals 101, 103, and 105 shown in FIG. 1 are resources constituting one physical channel, and each is a set of one subcarrier or a plurality of adjacent subcarriers. Reference numerals 101, 103, and 105 are arranged to be spaced apart by d at equal intervals. Where the interval d is the number of resources. If one resource is a set of n adjacent subcarriers, there are nd subcarriers including the reference numeral 101 between the reference numeral 101 and the reference numeral 103. To get the maximum frequency diversity gain in data transmission, it must be designed to experience channel response over the entire bandwidth. Equal spacing is most desirable in order to maximize the spacing between resources while allowing different physical channels to achieve the same frequency gain. In the example of FIG. 1, the number of equal sized physical channels that can be produced in equally spaced arrangements is d.

If channel mapping as shown in FIG. 1 is employed to reduce inter-cell interference, orthogonal patterns may be allocated to d cells. However, in more cells, 100% collision occurs. Therefore, if d is not large enough, the equally spaced channel allocation method may adversely increase the inter-cell interference.

FIG. 2 is a diagram illustrating a zone-based mapping method used to solve the shortcomings of the equally spaced channel allocation method.

First, the entire band used is divided into zones. Reference numerals 201, 203, and 205 denote regions of zone 1, zone 2, and zone M, respectively, and a plurality of resources are defined in each region. One resource is selected in each region to place a modulation symbol of a physical channel. Reference numerals 211, 213, and 215 denote resources selected from zone 1 201, zone 2 203, and zone M 205, respectively, in which one physical channel is disposed.

Zone-based mapping is not the way to get the maximum frequency diversity gain. This is because the frequency diversity gain obtained here is reduced when the interval of the selected resource in the adjacent area is small. However, if the number of zones is large enough, the effect of reducing the frequency diversity gain can be offset. Diversity gain is proportional to diversity order, which is determined by the number of uncorrelated channel responses. This does not mean that the diversity gain is linearly proportional to the diversity coefficient. As the diversity coefficient increases, the diversity gain additionally decreases. The diversity coefficient of a physical channel arranged by zone-based mapping is proportional to the number of zones. Therefore, if the number of zones is large enough, the diversity gain obtained by zone-based mapping does not show the difference from the diversity gain obtained by the equally spaced channel arrangement method.

The number of physical channel arrangements that can be obtained through zone-based mapping is increased compared to the method of equally spaced channel placement. Therefore, the probability of 100% collision of resources in cell-to-cell deployment can be greatly reduced. In the equally spaced channel arrangement method, interference does not occur at least between cells using orthogonal patterns, but inter-cell interference increases due to 100% collision of resources between cells that do not use orthogonal patterns. That is, in the equally spaced channel arrangement method, resource collision between patterns is 0% or 100%. However, in the zone-based mapping method, the number of patterns that do not occur 100% of resources is increased, but partial resource dispatch occurs between patterns.

3 is a diagram for explaining a concept of a cell and a sector in a cellular mobile communication scheme.

In general, a cell is a region that one base station is responsible for. In FIG. 3, reference numerals 300, 310, 320, and 330 correspond thereto. In addition, in a cellular mobile communication system, in order to increase efficiency, a base station located at one location may be provided with different transceivers so as to serve as a plurality of base stations. The area in which the transceiver is in charge is called a sector. Sectors use directional antennas to reduce intersector interference in the same cell. In general, a three sector structure as shown in FIG. 3 is considered in the cellular mobile communication scheme. One cell is composed of three sectors. For example, cell 300 includes sectors 301, 302, and 303.

Since sectors are spatially adjacent and have limited isolation characteristics by directional antennas, intersector interference in the same cell is higher than that between different cells. Therefore, there is a need for a method capable of first lowering inter-sector interference. One of reflecting this design purpose is a reference signal (hereinafter referred to as "RS") defined in 3GPP Long Term Evolution (LTE) system.

4 is a diagram illustrating a downlink RS configuration defined in an LTE system.

The resource arrangement diagram 400 at the top of FIG. 4 illustrates an RS arrangement used in one cell, and the resource arrangement diagram 450 at the bottom illustrates an RS arrangement used in another cell. 401, 402, 403, 411, 412, 421, 422, 423, 431, 432 and 451, 452, 461, 463, 471, 472, 481, 482, 483, etc. The frequency-time bin of is where RS is transmitted. As shown in FIG. 4, different cells use different RS arrangements. Meanwhile, a symbol string designed to maintain orthogonality between sectors is transmitted to the RS. Reference numeral 433 denotes an RS set of 401, 402, and 411, and is designed to be zero when these 3 RS symbols used by other sectors in the same cell are internalized. This is so that when the transmission RS is internalized to estimate a channel in one sector, the channel response of that sector is calculated and the channel response from the other sector is removed. This orthogonal characteristic applies to the inner product of 441, which consists of 401, 402, and 403, and also applies to 443, which consists of 411, 421, and 422. That is, three adjacent RSs on the frequency axis or three adjacent RSs on the frequency-time axis are designed such that a symbol string is used as an RS symbol string so as to be orthogonal between sectors.

On the other hand, since RSs used at 400 and 450 use different frequency-time bins, it can be determined that they use orthogonal characteristics between cells, but modulation symbol sequences of other channels are transmitted to frequency-time bins other than RS. Therefore, there is no interference from RS of other cells, but interference from other channels of other cells occurs.

The downlink RS design in the LTE system completely removes inter-sector interference in the same cell, but allows some inter-cell interference. In other words, the inter-sector interference is considered more than the inter-cell interference.

However, the interference cancellation method currently designed in the LTE system is difficult to see as an efficient method. There is also a problem that no arrangement pattern can be used in cell planning.

Accordingly, the present invention provides an apparatus and method for reducing inter-sector interference in the same cell preferentially compared to inter-cell interference in physical resource allocation.

In addition, the present invention provides an apparatus and method for obtaining frequency diversity gain by using a zone-based mapping method when resource allocation.

In addition, the present invention provides an apparatus and method that can easily support cell planning by ensuring a sufficient number of deployment patterns.

In the method for allocating resources in the wireless communication system proposed by the present invention, the method of allocating a resource allocation pattern of a corresponding cell by using an identifier for each cell and an identifier of sectors constituting the corresponding cell, and determining the determined resource for the corresponding cell Allocating a resource according to the allocation pattern.

The apparatus for allocating resources in the wireless communication system proposed by the present invention includes a control unit for determining a resource allocation pattern of a corresponding cell using an identifier for each cell and an identifier of sectors constituting the corresponding cell, and the determined resource for the corresponding cell. And a channel mapping unit for allocating resources according to the allocation pattern.

According to the present invention, the number of patterns can be sufficiently secured by determining an arrangement pattern based on zone-based hopping, thereby effectively reducing inter-cell interference and facilitating cell planning. And because zone-based hopping changes the selected resources over time, conflicting resources change, and therefore interference characteristics change over time. For this reason, even if a physical channel has a poor channel state due to interference once, the interference state can be expected to be improved in the next transmission. The physical channel arrangement method proposed by the present invention can avoid performance degradation due to intersector interference by ensuring that different resources are selected between sectors within the same cell.

The operation principle of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

5 is a diagram illustrating an example of arrangement of physical channels according to the present invention.

Reference numeral 501 denotes an arrangement pattern used in one cell, and reference numeral 503 illustrates an arrangement pattern used in another cell. Cells with reference numeral 501 have arrangement patterns 510, 520, and 530 used by three sectors in the cell, respectively. Cells with 503 have arrangement patterns 540 and 550 used by three sectors in the cell. There are 560. 5 illustrates a frequency resource to which one physical channel is mapped in one OFDM symbol for convenience of understanding, but may support a hopping function using different layout patterns in different OFDM symbols.

In the embodiment of FIG. 5, the entire band is divided into M zones, and one resource is selected in each zone. In the sector using the reference numeral 510, it can be seen that one physical channel is mapped by selecting resource 511 in zone 1 201, resource 512 in zone 2 203, and resource 513 in zone M 205. . A characteristic of the present invention is that the physical channel resources 511, 512, and 513 used in the sector using the reference numeral 510 are the physical channel resources 521, used in the reference numeral 520 which are different sectors belonging to the same cell 501. 522 and 523). Therefore, there is no resource where physical channels collide between sectors in a cell. This characteristic is the same as that of the prior art arrange | positioned at equal intervals. However, in the embodiment of FIG. 5, it can be seen that the arrangement patterns used by the reference cells 501 and 503 that are different cells are different from each other. For example, a sector using reference number 530 and a sector using reference number 560 belong to different cells, and resources 532 and 562 selected in zone 2 (203) collide while resources selected in another zone do not collide. Do not. This placement characteristic is identical to that of zone-based mapping. Since the arrangement pattern is set differently for each cell as described above, the number of cells using different arrangement patterns can be increased compared to the prior art of disposing at equal intervals.

A method of arranging the same arrangement characteristics as shown in FIG. 5 is expressed by Equation 1 below.

n _i = (i-1) * zone_size + mod (offset (i, cell_ID, time_index) + sector_ID, zone_size)

I represents a zone index and n _i represents a resource number to be selected in the i-th zone. Resource numbers are assigned throughout the band. zone_size represents the number of resources constituting one zone. When the total number of resources is N _total , zone_size = floor (N _total / M). Where floor (x) is a rounding function and represents the maximum integer less than or equal to x. offset (i, cell_ID, time_index) is a function for calculating the offset of the selected resource in the zone. The offset (i, cell_ID, time_index) is a function of the zone index i, the cell indicator cell_ID and the time indicator time_index. Accordingly, different offsets are determined for each cell, and for example, a zone-based hopping operation in which an offset value is changed for each OFDM symbol is supported. In the same cell, the same offset is obtained. In order to satisfy the condition that there is no conflicting resource between sectors, the sector indicator sector_ID is added to the offset, and mod operation is performed by zone_size. Here, mod (x, y) means the remainder of dividing x by y. This means that if the offset_sector_ID is added to the zone within the zone, it can refer to a resource within the zone.

According to the operation of Equation 1, since the offsets are different between cells, the arrangement pattern is determined differently, and resource collision between cells is allowed. On the other hand, the sectors belonging to the same cell is characterized in that the collision of resources does not occur by applying different shifts to the same arrangement pattern.

In an actual system, cell_ID and sector_ID may not be defined separately. For example, the base station indicator BS_ID may be defined as a single variable by integrating the cell identifier cell_ID and the colorator identifier sector_ID. In the LTE system, RS is arranged differently between cells and orthogonal RS symbols are used between sectors. To apply this, even if only one variable of BS_ID is used, whether a sector belongs to the same cell is indicated by a set of rules. Can be distinguished, and accordingly, RS placement and symbol application defined in LTE should be performed. In the present invention, the arrangement method is formulated by introducing variables of cell_ID and sector_ID for convenience of understanding, but in the actual system, whether a sector belonging to the same cell is indicated or not is indicated by a set of rules of one variable of BS_ID. Equation 1> should be applicable.

On the other hand, cell_ID, sector_ID, or BS_ID, and time-index are information obtained when the terminal is connected to the system. For example, this information is contained in the sync channel where the terminal first attempts to connect to the system. Therefore, the base station and the terminal can share the arrangement pattern synchronized with each other without going through a separate process. In the LTE system, two synchronization channels, a primary synchronization channel (hereinafter referred to as "P-SCH") and a secondary synchronization channel (hereinafter referred to as "S-SCH"), are defined. The LTE system defines a total of 510 BS_IDs, and 170 cell_IDs and three sector_IDs per cell_ID are defined. Since the P-SCH transmits one of three signal sequences determined according to sector_ID, sector_ID information can be obtained when the P-SCH is received, and the S-SCH transmits one of 170 signal sequences determined according to cell_ID. When receiving the cell_ID information can be obtained. In a real LTE system, BS_ID is specified as a cell ID, cell_ID as a cell ID group, and a sector ID as a cell ID per cell ID group. However, in the present invention, variable names such as BS_ID, cell_IS, and sector_ID are used for convenience of description. It was.

Equation 2 is another embodiment in which a method of arranging resources proposed by the present invention is expressed by an equation.

n _i = (i-1) * zone_size + mod (shift (offset (i, cell_ID, time_index), sector_ID), zone_size)

Equation 2 is a more general equation than Equation 1, which applies a shift depending on sector_ID to an offset, unlike sector 1 through the mod function by adding sector_ID to offset in Equation 1. The function shift (offset, sector_ID) is used to determine the placement. When defined in the same manner as in Equation 1, shift (offset, sector_ID) = offset + sector_ID.

Equation 3 is another embodiment in which the arrangement method proposed by the present invention is expressed as an equation.

ni = (i-1) * zone_size + mod (shift (offset (i, cell_ID), sector_ID), zone_size)

The characteristic of Equation 3 is that offset is not a function of time_index. That is, it shows the case where an arrangement position does not change with time.

FIG. 6 is a diagram illustrating an example of applying a zone-based shift and zone-based hopping proposed in the present invention to a PCFICH transmitting CCFI used in an LTE system.

The CCFI is a Control Channel Format Indicator (CCFI), and the PCFICH is a Physical Control Format Indicator Channel.

In the LTE system, a control channel is transmitted in the first N OFDM symbols in a subframe composed of 14 OFDM symbols and a data channel is transmitted in the remaining OFDM symbols. Here, N may have one of 1,2,3 values, and CCFI information is transmitted in the first OFDM symbol so that N may know which one is 1,2,3. That is, CCFI indicates N. When the PCFICH of the first OFDM symbol is received, it is possible to know how many control channels exist in the first OFDM symbol. CCFI generates 32 coded bits through (32,2) channel coding consisting of 2 bits, and performs QPSK modulation on 16 subcarriers. Since the PCFICH must be able to receive in one transmission, it should be dropped as far as possible to get the maximum frequency diversity gain. The LTE system stipulates that the control channel is allocated in units of resources called mini-control channel elements (mini-CCEs) including four adjacent subcarriers excluding RS. Therefore, the PCFICH uses four mini-CCEs and the distance between the mini-CCEs should be kept as far as possible to obtain frequency diversity gain.

When the present invention is applied to the PCFICH, the entire band should be divided into four zones and one min-CCE should be selected in each zone. The embodiment of FIG. 6 is illustrated based on 1.4 MHz, which is the minimum bandwidth defined in the LTE system. The entire band is divided into zone 1 (601), zone 2 (602), zone 3 (603), and zone 4 (604), and there are three mini-CCEs in each zone. Zone 1 (601) mini-CCE 1-1 (611), mini-CCE 1-2 (612), mini-CCE 1-3 (613), zone 2 (602) mini-CCE 2-1 (621) ), mini-CCE 2-2 (622), mini-CCE 2-3 (623), zone 4 (604) include mini-CCE 4-1 (641), mini-CCE 4-2 (642), mini- CCE 4-3 (643) and the like have been determined. For convenience, the mini-CCE arrangement of zone 3 (603) has been omitted. Reference numeral 660 denotes an arrangement pattern used by one cell and reference numeral 670 denotes an arrangement pattern used by another cell. Reference numeral 681 and reference numeral 682 denote RS 1 which is an RS transmitted by the transmit antenna 1 and RS 2 which is an RS transmitted from the transmit antenna 2, respectively. As described in FIG. 4 of the prior art, RSs are arranged in different positions in different cells. According to the embodiment of FIG. 6, RS is disposed in the first and fourth subcarriers in the mini-CCE in a cell using the reference numeral 660, and the second and fifth sub in the mini-CCE in the cell using the reference numeral 670. RS is placed in the carrier.

On the other hand, reference numeral 683 denotes a subcarrier used by the PCFICH. In LTE, a subcarrier is referred to as a resource element (hereinafter, referred to as a "RE") in the concept of resources. Reference numeral 684 denotes a subcarrier (RE) used or not used by another control channel PDCCH or PHICH.

Reference numerals 661, 662, and 663 denote an arrangement pattern used by sectors belonging to a cell using the reference numeral 660, so that mini-CCEs used for CCFI transmission do not collide with each other. On the other hand, it can be seen that some mini-CCEs collide with sectors belonging to the cell using the reference numeral 670. For example, the mini-CCE selected in zone 1 in reference numeral 661 is 611, but also in reference numeral 671, a reference 611 was selected and a collision occurred.

7 is a block diagram of a transmitter to which the present invention is applied.

Data transmitted on one physical channel is input to the channel encoder and modulator 701, and the channel is encoded, modulated, and output as a modulation symbol. On the other hand, the controller 705 uses a cell ID and a sector ID or a base variable, BS_ID, which is a single variable that can be inferred, and a time index. Based on the shift pattern and the zone-based hopping, the deployment pattern is determined and output to the channel mapper 703. The channel mapper 703 arranges a physical channel and arranges modulation symbols according to the arrangement pattern. The arranged modulation symbols are processed by the OFDMA processing unit 707 as OFDMA transmission symbols and output to the radio unit 709. The radio unit 709 performs band-up conversion of the inputted OFDM symbol, converts the received OFDM symbol into a radio frequency, and transmits the converted radio frequency.

8 is a block diagram of a receiver to which the present invention is applied.

The wireless signal received through the antenna is band-down converted by the wireless unit 721 and then converted into a digital signal and input to the OFDMA processing unit 723. The OFDMA processing unit 723 converts the input OFDMA symbol into a modulation symbol and outputs the converted OFDMA symbol to the channel comparator 725. The controller 727 uses a cell ID and a sector ID or a single variable base station identifier BS_ID capable of inferring the same and a time index as a factor, thereby providing a zone-based shift. ) And a deployment pattern to which the zone-based hopping is applied and are output to the channel history receiver 725 based on the deployment pattern. The channel inverter 725 then extracts a modulation symbol using the arrangement pattern. The extracted modulation symbols are demodulated and decoded by the demodulation and channel decoder 729 and restored to the transmission data.

9 is a control flowchart at the time of transmission in the system according to the present invention.

The transmitter generates a modulation symbol from the information data string through channel encoding and modulation in step 801. In operation 803, the transmitter determines an offset of a resource to be selected in each zone based on the time index and the cell ID. In this case, when the arrangement pattern does not change with time, step 803 determines the offset based only on the cell ID. Thereafter, in step 805, the transmitter determines a resource allocation pattern based on an additional shift value determined by a sector ID and an offset obtained from 803. In step 807, the transmitter arranges the modulation symbol generated in step 801 on the subcarrier or resource set based on the resource allocation pattern obtained in step 805. The transmitter generates and transmits an OFDM signal in step 809.

10 is a control flowchart at the time of reception in the system according to the present invention.

The receiver receives an OFDM signal in step 811. The receiver obtains an arrangement pattern used by one physical channel through steps 803 and 805 as shown in FIG. 9. In step 817, the receiver extracts modulation symbols of the corresponding physical channel based on the resource allocation pattern obtained in step 805, and restores transmission data through demodulation and channel decoding in step 819.

1 is a diagram illustrating physical channels arranged at equal intervals on a frequency axis to obtain frequency diversity gain;

FIG. 2 is a diagram illustrating a zone-based mapping method used to solve the shortcomings of the equally spaced channel allocation method. FIG.

3 is a view for explaining a concept of a cell (cell) and a sector (sector) in the cellular mobile communication method,

4 is a diagram illustrating a downlink RS configuration defined in an LTE system;

5 is a diagram illustrating an example of arrangement of physical channels according to the present invention;

6 is a diagram illustrating an example of applying a region-based transition and region-based hopping proposed by the present invention to a PCFICH transmitting CCFI used in an LTE system;

7 is a block diagram of a transmitter to which the present invention is applied;

8 is a block diagram of a receiver to which the present invention is applied;

9 is a control flowchart at the time of transmission in the system according to the present invention;

10 is a control flowchart at the time of reception in a system according to the invention.

Claims (10)

A method for allocating resources in a wireless communication system, Determining a resource allocation pattern of the cell by using the cell-specific identifier and the identifiers of the sectors constituting the cell; And allocating a resource to the corresponding cell according to the determined resource allocation pattern. The method of claim 1, Determining a resource allocation pattern of the corresponding cell, And determining a resource allocation pattern of each of the sectors by using an identifier of a first cell and an identifier of each of the sectors constituting the first cell. The method of claim 2 Determining a resource allocation pattern of each of the sectors, And determining the resource allocation pattern of each of the sectors that change over time. The method according to claim 1, Determining a resource allocation pattern of the corresponding cell, Dividing the entire frequency band usable by the wireless communication system into a plurality of regions; And determining the resource allocation pattern such that resources including different partial equal interval frequency bands are allocated to each of the sectors in a corresponding one of the plurality of regions. 5. The method of claim 4, The resource allocation pattern allocated to each of the sectors is And a pattern in which resources overlapping with partial equal interval frequency bands allocated to sectors of other cells in the same region are allocated. An apparatus for allocating resources in a wireless communication system, A control unit for determining a resource allocation pattern of the corresponding cell using an identifier for each cell and identifiers of sectors constituting the corresponding cell; And a channel mapping unit for allocating a resource to the corresponding cell according to the determined resource allocation pattern. The method according to claim 6, Wherein, And a resource allocation pattern of each of the sectors, using the identifier of the first cell and the identifier of each of the sectors constituting the first cell. The method of claim 7, wherein Wherein, And determining the resource allocation pattern of each of the sectors that change over time. The method according to claim 6, Wherein, Divide the entire frequency band usable by the wireless communication system into a plurality of regions, And determining the resource allocation pattern such that resources including different partial equal interval frequency bands are allocated to each of the sectors in a corresponding one of the plurality of regions. 10. The method of claim 9, The resource allocation pattern allocated to the corresponding sector, And a pattern in which resources overlapping with partial equal interval frequency bands allocated to sectors of other cells in the same region are allocated.

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