KR100894142B1 - Method and apparatus for resource allocation in a ofdm system - Google Patents

Abstract

Provided are a method and apparatus for allocating radio resources by mixing a localized transmission method and a distributed transmission method in an orthogonal frequency division multiple access system. The present invention provides a method for allocating radio resources using a local transmission scheme and a distributed transmission scheme in an OFDM system. In addition, the present invention provides an advantage of allocating radio resources to each of the terminals according to a distributed transmission scheme in consideration of the traffic type and channel state of each terminal. That is, the present invention distributes and allocates a plurality of distributed virtual resource blocks to physical resource blocks of a predetermined size, thereby providing a corresponding terminal with an effect of maximizing frequency diversity gain for transmitted data.

OFDM, localized transmission, distributed transmission, resource block

Description

Method and apparatus for allocating radio resources in orthogonal frequency division multiple access system {METHOD AND APPARATUS FOR RESOURCE ALLOCATION IN A OFDM SYSTEM}

1 illustrates an example of an OFDM system using a general localized transmission scheme.

2 illustrates an example of an OFDM system using a general distributed transmission scheme.

3 illustrates an example of mapping a virtual resource block VRB to a physical resource block PRB.

4 is a diagram showing a mapping relationship between a VRB and a PRB according to the first and second exemplary embodiments of the present invention.

5 is a diagram illustrating a mapping relationship between a VRB and a PRB according to a third exemplary embodiment of the present invention.

6 is a diagram illustrating an example of radio resource mapping using a distributed transmission scheme according to a fourth embodiment of the present invention.

7 is a diagram illustrating an example of radio resource mapping using a distributed transmission scheme according to a fifth embodiment of the present invention.

8 is a diagram illustrating a transmitting device according to a preferred embodiment of the present invention.

9 is a diagram illustrating a receiving device according to a preferred embodiment of the present invention.

The present invention relates to a communication system using a multiple access scheme, and more particularly, to a method and apparatus for allocating radio resources in a communication system for transmitting and receiving data based on an orthogonal frequency division multiplexing scheme.

Recently, in the mobile communication system, orthogonal frequency division multiplexing (OFDM) is 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, and a plurality of sub-carriers having mutual orthogonality to each other by converting symbol strings serially input in parallel. ), That is, a type of multi-carrier modulation (MCM) that modulates and transmits a plurality of sub-carrier channels.

The OFDM scheme has the following advantages.

By maintaining orthogonality between a plurality of subcarriers and transmitting the overlapping frequency spectrum, frequency use efficiency is good.

In addition, there is a strong feature in multi-path fading (multi-path fading) has the feature that can be obtained the optimum transmission efficiency in high-speed data transmission.

In addition, it is strong in frequency selective fading, and it is possible to reduce the influence of Inter Symbol Interference (ISI) by using a guard interval, and it is possible to simply design an equalizer structure in hardware. Do.

In addition, it has an advantage of being resistant to impulsive noise, and thus is being actively used in a communication system structure.

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 a terminal, and frequent speed change of a received signal caused by fading in addition to Additive White Gaussian Noise (AWGN). (doppler) effect, interference with other users and multipath signal (frequently changes).

Therefore, in order to support high speed, high quality data service in wireless communication, it is necessary to effectively overcome the aforementioned factors.

In this regard, the following transmission schemes and techniques have been proposed in an OFDM system to overcome the fading phenomenon.

First, there is a localized transmission method, and second, a distributed transmission method is proposed.

First, the local transmission method will be described.

The local transmission scheme is an adaptive modulation and coding (AMC) scheme that adaptively adjusts a modulation scheme and a coding scheme according to a channel change of downlink. Here, the channel change of the downlink, that is, the channel quality information (CQI) is usually measured by measuring a signal-to-noise ratio (hereinafter referred to as SNR) of a received signal at a user terminal which is a receiving apparatus. Can be detected. In addition, the terminal feeds back the measured downlink channel quality information to the base station through the uplink (uplink). Accordingly, the base station has the channel quality information of the downlink fed back from the terminal, estimates the channel state of the downlink, and adjusts a modulation scheme and a coding scheme according to the estimated channel state.

Therefore, in the case of using the local transmission scheme, in general, when the state of the channel is relatively good, the higher order modulation method and the higher code rate are applied. do.

In this way, the regional transmission scheme improves the average performance of the system by increasing the adaptive capability to change the channel compared to the conventional scheme, which relies on high-speed power control. Meanwhile, the local transmission is also called block-wise transmission.

In this regard, FIG. 1 shows an example of a conventional OFDM system using the local transmission scheme.

Referring to FIG. 1, the horizontal axis represents the time axis and the vertical axis represents the frequency axis. In this case, reference numeral 101 denotes one subcarrier and reference numeral 102 denotes one OFDM symbol.

In an OFDM system using local transmission, the entire frequency band is divided into N subcarrier groups and AMC is performed for each subcarrier group. In addition, scheduling is performed in units of a plurality of OFDM symbols, such as 105.

Therefore, one subcarrier group is referred to as one resource block (hereinafter referred to as 'RB'), and the RB is composed of X consecutive subcarriers and Y consecutive OFDM symbols, and the size thereof is X. * Y In FIG. 1, subcarrier group 1 of 103 is referred to as RB 1, and subcarrier group N of 104 is referred to as RB N. As described above, the AMC operation in the OFDM system has a plurality of RBs and is performed by applying the AMC independently for each RB.

Accordingly, each terminal feeds back CQI information for each RB, and the base station receives channel quality information for the corresponding RB from each terminal, performs scheduling for each RB, and transmits user data for each RB. Therefore, when the base station scheduling selects a terminal having the best channel quality for each RB and transmits data, system capacity can be maximized.

In addition, the characteristics of the AMC scheme, it can be seen that the more adjacent to each other a plurality of sub-carriers required for transmitting data for one terminal. If the frequency selectivity occurs in the frequency domain due to the multipath radio channel, the strength of the channel response between the adjacent subcarriers may be similar, but the strength of the channel response between the distant subcarriers may vary greatly. Because it can. Therefore, when the AMC is applied, subcarriers with good channel response are collected to transmit data, thereby maximizing system capacity.

As a result, the local transmission technique is suitable for data transmission to be transmitted to a specific user. This is because channels transmitted to a plurality of users, for example, broadcast or common control information channels, are not preferably adapted to the channel state of any one user.

In addition, the regional transmission technique is suitable for transmission of data traffic less sensitive to transmission delay. Because the local transmission technology basically selects terminals in a good channel to transmit data, delay-sensitive traffic, for example, real-time traffic such as voice over IP (VoIP) or video meeting This is because the user cannot wait until the channel improves. That is, in order to guarantee the delay limit for the users serving the real-time traffic, data must be transmitted to the corresponding user even in a situation where the channel is not good.

As mentioned above, the local transmission technique is not suitable for delay-sensitive traffic such as broadcast, traffic that should not be adapted to a specific user's channel environment such as a common control channel, or real time traffic. Then, it is to find out which transmission method is suitable for such real-time traffic and broadcast and traffic using a common channel.

In general, the wireless channel varies in the time axis, and the phenomenon is good in the frequency domain and in some areas, and the bad channel in some areas. In such a channel environment, when data cannot be transmitted by adapting to a specific user's channel, sometimes the channel is received in a good state from the perspective of each terminal receiving the transmitted data, and sometimes the channel is received in a bad state. The phenomenon is inevitable. A technique suitable for use in such an environment or traffic is a distributed transmission technique.

In other words, the distributed transmission technology aims to ensure that the transmitted data evenly experience the best channel and the bad channel. The reason is that if a particular data transmission, such as a particular data packet, is received in a bad channel condition, it will be difficult for the packet to be successfully demodulated. However, from the point of view of reception performance, if there are symbols having bad channels and symbols having bad channels and modulation symbols included in one packet, the symbols having bad channel conditions are used for symbols having bad channel conditions. This is because packet demodulation may be possible. The distributed transmission is also referred to as scattered transmission.

2 shows an example in which user data or common control information is transmitted by applying the above-described distributed transmission technique in a conventional OFDM system.

In FIG. 2, the base station transmits data to three mobile stations (MSs), that is, MS 1, MS 2, and MS 3. In this case, as data is transmitted in a distributed transmission method, data transmitted to one terminal may be scattered in a frequency domain and in a time domain.

Data symbols of MS 1 transmitted during the OFDM symbol indicated by reference numeral 201 occupy three subcarriers. In general, subcarriers for each terminal are spread over the entire band in order to obtain a frequency diversity gain in the frequency domain. In addition, specific subcarrier positions for the terminal are promised to each other between the base station and the terminal. In addition, it can be seen that the positions of the symbols transmitted to MS 1 during the OFDM symbol period indicated by 201 and the positions of the symbols transmitted to MS 1 during the OFDM symbol period indicated by 202 are different.

In addition, in order to maximize the effect of time diversity gain on the time axis, the transmitting apparatus sets whether to transmit data symbols on different subcarriers every OFDM symbols or every other predetermined time unit. This is commonly referred to as frequency hopping, and the frequency hopping technique is applied together in an OFDM system that employs diversity technique.

As described above, the OFDM communication system uses two transmission methods, a local transmission technique and a distributed transmission technique, to overcome fading. The transmission techniques are in contrast to each other and the types of traffic suitable for use are also different.

In this regard, in the current mobile communication system, instead of operating the system by applying only one of the transmission technologies, there is a need for a method of appropriately mixing and transmitting the transmission methods. That is, a transmission scheme capable of minimizing fading of a user terminal and maximizing frequency diversity gain is needed.

Accordingly, the present invention, which was devised to solve the problems of the prior art operating as described above, provides a method and apparatus for mapping radio resources by adaptively applying a local transmission scheme and a distributed transmission scheme in an OFDM system.

In addition, the present invention provides a method and apparatus for mapping radio resources using a distributed transmission scheme when mapping radio resources to physical channels in a mobile communication system.

In addition, the present invention provides a method and apparatus for demapping radio resources by adaptively applying a local transmission scheme and a distributed transmission scheme in an OFDM system.

The present invention also provides a method and apparatus for demapping radio resources using a distributed transmission scheme in a mobile communication system.

In the present invention, in the method for allocating radio resources of a transmitting apparatus in an orthogonal frequency division multiple access system, the number I of physical resource blocks (PRBs), which are mapping units of a physical channel, and a distributed transmission scheme are used. Determining a number J of distributed virtual resource blocks (VRBs), determining a parameter K representing a separation interval between the distributed VRBs using the I and the J, and among the I PRBs Sequentially mapping the J distributed VRBs to the J first PRBs having the K spacing interval, and among the I PRBs, remaining (IJ) second PRBs except the first PRBs The method includes mapping the local VRBs to be used as a local transmission method, and assigning the PRBs to at least one terminal according to the transmission method of the mapped VRBs. The.

The present invention relates to a radio resource allocation method in an orthogonal frequency division multiple access system, wherein the number I of physical resource blocks (PRBs), which are mapping units of physical channels, and distributed virtual resource blocks for use in a distributed transmission method. Determining a number J of the VRBs, wherein the PRBs and the VRBs each include K and L subcarriers, and include the first PRBs having a K spacing interval among the I PRBs. Sequentially mapping the J distributed VRBs, and subcarriers having an interval of L between each of the subcarriers constituting the J distributed VRBs are located in adjacent subcarriers within the first PRBs. Mapping the subcarriers of the distributed VRBs to the subcarriers of the first PRBs, and the remaining (IJ) other than the first PRBs among the I PRBs to be mapped. PRB to 2, characterized in that it comprises the step of assigning to the at least one terminal according to the transmission scheme of the process of mapping the areas and VRB, the mapped VRB of the PRB for use as a local transmission system.

The present invention relates to a radio resource allocation apparatus in an orthogonal frequency division multiple access system, wherein the number I of physical resource blocks (PRBs) consisting of K subcarriers, which are mapping units of physical channels, and L subcarriers. Determining the number (J) of distributed virtual resource blocks (VRB) to be used in a distributed transmission scheme consisting of a plurality of J, and sequentially distributed the J distributed VRBs to the first PRBs having a K spacing interval of the I PRBs And subcarriers having a spacing interval of L among the subcarriers constituting the J distributed VRBs are mapped to mutually adjacent subcarriers in the first PRBs. Map subcarriers to subcarriers of the first PRBs, and local transmission of the I PRBs to the remaining (IJ) second PRBs except the first PRBs And it characterized in that it comprises a map assigning to at least one terminal as a transmission scheme of a scheduler to map VRB regions, the mapped VRB of the PRB for use with expression.

In the present invention, in the method for receiving radio resource allocation in an orthogonal frequency division multiple access scheme system, the number I of physical resource blocks (PRBs), which are mapping units of physical channels, and distributed virtual resources for use in a distributed transmission scheme Receiving a signal (J) of the number of blocks (VRBs), wherein the PRBs and the VRBs each include K and L subcarriers, and the first PRBs having a K spacing interval among the I PRBs. Obtaining the J distributed VRBs sequentially mapped to the first PRBs, wherein subcarriers having an interval of L between each of the subcarriers constituting the J distributed VRBs The subcarriers of the distributed VRBs are mapped to the subcarriers of the first PRBs so that the subcarriers of the distributed VRBs are mapped to mutually adjacent subcarriers within the first PRBs. Acquiring local VRBs mapped to be used as (IJ) local transmission methods excluding the first PRBs from RBs from second PRBs, and transmitting according to transmission methods of corresponding mapped VRBs of PRBs And a process of acquiring data.

The present invention relates to a receiving apparatus receiving radio resource allocation in an orthogonal frequency division multiple access scheme system, wherein the number I of physical resource blocks (PRBs), which are mapping units of physical channels signaled from a transmitting apparatus, and a distributed transmission scheme. Using the number J of distributed virtual resource blocks (VRBs) to be used, wherein the PRBs and the VRBs are each composed of K and L subcarriers, and have K spacing intervals among the I PRBs. Obtaining the J distributed VRBs sequentially mapped to the first PRBs from the first PRBs, wherein subcarriers having an interval of L between each other among the subcarriers constituting the J distributed VRBs Subcarriers of the distributed VRBs are mapped to subcarriers of the first PRBs such that they are mapped to mutually adjacent subcarriers within the first PRBs. And a de-mapper for obtaining local VRBs mapped from the second PRBs for use in the remaining (IJ) local transmission schemes except for the first PRBs among the I PRBs, and the corresponding mapped VRBs of the PRBs. And a decoder for decoding the demodulated data of the demodulated PRBs.

Hereinafter, the operating principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

The present invention to be described later, by adaptively applying a local transmission method and a distributed transmission method according to the characteristics of traffic in an OFDM-based communication system, provides a method for allocating radio resources using the two methods together. The present invention more specifically proposes a method of allocating radio resources according to a distributed transmission method corresponding to each of the terminals in consideration of the traffic type and the channel state of each of the terminals.

In other words, the present invention proposes a concrete configuration method for how resources corresponding to each transmission scheme are mapped to a physical channel when the local transmission scheme and the distributed transmission scheme are configured together. In addition, the present invention proposes a specific configuration method for mapping resources corresponding to the distributed transmission scheme to physical channels, that is, physical resource blocks.

Hereinafter, in the present invention, terms are defined as follows.

Physical Resource Block (hereinafter, referred to as 'PRB'): A unit to which resources are allocated and mapped, and is composed of M consecutive subcarriers and N consecutive OFDM symbols, and the size thereof is MxN. In general, the N OFDM symbols constitute one subframe.

■ Virtual Resource Block (hereinafter referred to as 'VRB'): A virtual resource allocation unit before a resource is mapped in the real time / frequency domain, which is localized VRB and distributed virtual according to the transmission method. It is divided into a resource block (distributed VRB).

Local Virtual Resource Block (LVRB): In local transmission, a localized VRB is mapped to the PRB in "local" format.

Distributed Virtual Resource Block (DVRB): In a distributed transmission, a Distributed Virtual Resource Block (DVRB) is mapped to a PRB in a "distributed" format.

For convenience of explanation, the size of all resource blocks will be considered in the frequency domain. In addition, it is apparent that the size of the resource block can be represented as a two-dimensional region on the time and frequency side by extending to the time domain.

In addition, in the base station scheduling according to the present invention, each terminal feeds back CQI information through one uplink for one PRB or a plurality of PRBs, and the base station provides channel quality information for each PRB of the terminal based on the fed back CQI information. Acquire. Thereafter, scheduling for each PRB is performed to allocate each PRB to the UE and transmit user data using the allocated PRB. In this case, the base station may use a mixture of local transmission and distributed transmission in order to improve system performance. That is, it is possible to select whether to perform localized transmission or distributed transmission for each PRB. At this time, the terminal can accurately receive the type of transmission method for each PRB to receive data. Therefore, signaling corresponding to the transmission scheme is required.

On the other hand, if the transmission scheme for each PRB follows a predefined rule, signaling overhead between the terminal and the base station can be reduced. Hereinafter, in the present invention, a rule for determining which transmission scheme VRB is mapped to each PRB will be described as follows using one embodiment below.

First, the base station determines the total number I of PRBs and the total number J of distributed VRBs.

Here, the indexes indicating the positions of the PRBs are i = 0,... , I-1, and indexes representing each distributed VRB are j = 0,... , J-1. The total number I of PRBs may be predetermined in consideration of a system band or the like, or may be determined by a base station and inform the terminal through signaling. In addition, the total number of distributed VRBs and the total number of local VRBs may be determined in consideration of the traffic type currently being transmitted by the base station scheduler, CQI feedback information of the terminal, or may use a predetermined value.

In addition, a parameter K representing an interval between distributed VRBs mapped to the PRB is determined using Equation 1 below. Here, [x] means the maximum integer not exceeding x. By the above definition, the distances in which each distributed VRBs are distributed and mapped on the PRBs within the total number I of the given PRBs become maximum K-1.

Finally, the position L of the PRB to which the distributed VRBs are mapped is determined using Equation 2 below.

Locations other than the location L determined as in Equation 2 become PRBs to which the local VRBs can be mapped.

3 is a diagram illustrating a concept of mapping different transmission schemes for each PRB according to the present invention.

Referring to FIG. 3, the horizontal axis represents the frequency axis, 301 represents a PRB allocated by the base station for regional transmission, and 303 represents a PRB allocated by the base station for distributed transmission and distributed VRB is actually mapped.

로 설정된다. 최종적으로 분산 VRB가 매핑되는 PRB의 위치 L은

이 되며, 지역 VRB이 매핑될 수 있는 PRB들의 위치는 상기 {0, 4, 8} 을 제외한 {1, 2, 3, 5, 6, 7, 9} 가 된다.In this case, a total of 10 PRBs (I = 10) and 3 distributed VRBs (J = 3) will be described on the assumption. Therefore, the index i representing the PRB can be 0, 1, ..., 9 (= I-1), and the index j representing the distributed VRB can be 0, 1, 2 (= J-1). Therefore, the parameter K, which is a variable representing the separation interval between distributed VRBs mapped to the PRB, is

Is set to. Finally, the position L of the PRB to which the distributed VRB is mapped is

The positions of PRBs to which a local VRB can be mapped are {1, 2, 3, 5, 6, 7, 9} except for {0, 4, 8}.

As described above, the present invention defines the interval between distributed VRBs mapped to PRBs, and thereby defines distributed processing transmission mapping rules. At this time, the terminal needs to know the total number (I) of the PRB and the total number (J) of the distributed VRB, or the like to know the resource mapping position of the base station. Accordingly, the base station signals the terminal to information for obtaining the interval between distributed VRBs mapped to the PRB, so that both the base station and the terminal can calculate the exact mapping position of each VRB distributed and transmitted on the PRB according to a common rule. have. The signaling may be physical layer signaling or higher layer signaling.

On the other hand, in consideration of the multi-cell environment, the mapping rule using Equations 1 and 2 may cause a problem of deterioration of system performance. This is because when all cells apply the same mapping rule as described above, VRBs are mapped to the same PRBs in each cell, thereby interfering with each other in the corresponding PRBs.

Accordingly, the present invention represents a method of avoiding mutual interference between cells by changing the position L of the PRB to which the distributed VRB is mapped as follows.

Here, x mod y means the remaining value of x divided by y. "Offset" is a unique value for each cell and may be, for example, a cell ID.

Specific embodiments using the mapping rule will be described by dividing into Example 1, Example 2, and Example 3. FIG.

<First Embodiment>

The mapping rule of the VRB to the PRB to avoid the inter-cell interference mentioned above can be defined as follows.

The total number I of PRBs and the total number J of distributed VRBs are determined. At this time, the index indicating the position of each PRB is i = 0,... , I-1, indexes representing VRBs are j = 0,... , J-1.

The total number of PRBs may be predetermined in consideration of a system band or the like, or may be determined by the base station and inform the terminal through signaling. The total number of the distributed VRBs and the total number of local VRBs may be determined in consideration of the type of traffic currently to be transmitted by the base station scheduler, CQI feedback information of the terminal, or may use a predetermined value.

A parameter K representing the interval between distributed VRBs mapped to the PRB is determined using Equation 1 above.

Finally, the position L of the PRB to which the distributed VRB is mapped is determined through Equation 3 above. Positions in PRBs other than the determined position L become PRBs to which local VRBs can be mapped.

4 shows a specific example to which a mapping rule according to the first and second embodiments of the present invention is applied.

Referring to FIG. 4, the horizontal axis represents a frequency axis, 401 represents a PRB allocated by the base station for regional transmission, and 403, 405, and 407 represent PRBs allocated by the base station for distributed transmission and distributed VRB is actually mapped.

Assume three cells in total: cell # 0, cell # 1, and cell # 2, and each cell offset is assumed to be 0, 1, and 2, respectively. For convenience of description, FIG. 4 only considers mapping of distributed VRBs.

4 assumes a total of 10 PRBs (I = 10) and 3 distributed VRBs (J = 3) in each cell. Here, the index i representing the PRB can be 0, 1, ..., 9 (= I-1), and the index j representing the distributed VRB can be 0, 1, 2 (= J-1).

가 된다. 따라서, 셀 간 Offset 값을 반영한 각 셀의 분산 VRB가 매핑되는 PRB의 위치 L을 구하면 다음과 같다. 그러면 셀 #0에서 분산 VRB가 매핑되는 PRB의 위치 L은 <수학식 3>에 의해 {0, 4, 8}이 되고(참조부호 409), 셀 #1에서 분산 VRB가 매핑되는 PRB의 위치 L은 {1, 5, 9} 가 되고(참조부호 411), 셀 #2에서 분산 VRB가 매핑되는 PRB의 위치 L은 {0, 2, 6} 이 된다(참조부호 413). Accordingly, the parameter K representing the interval between distributed VRBs mapped to the PRB is

Becomes Therefore, if the position L of the PRB to which the distributed VRB of each cell reflecting the offset value between cells is mapped is obtained as follows. Then, the position L of the PRB to which the distributed VRB is mapped in cell # 0 becomes {0, 4, 8} by Equation 3 (reference 409), and the position L of the PRB to which the distributed VRB is mapped in cell # 1. Is {1, 5, 9} (reference numeral 411), and the position L of the PRB to which the distributed VRB is mapped in cell # 2 is {0, 2, 6} (reference numeral 413).

In addition, the positions of PRBs to which local VRBs are mapped for each cell are remaining except L determined for each cell. That is, {1, 2, 3, 5, 6, 7, 9} in cell # 0, {0, 2, 3, 4, 6, 7, 8} in cell # 1, {1, 3 in cell # 2 , Local VRB of each cell is mapped to PRBs of 4, 5, 7, 8, and 9}.

As described above, the present invention defines the position L of the PRB to which the distributed VRB is mapped for each cell. As shown by reference numbers 409 and 411, the distances mapped to each distributed VRBs on the PRBs within the total number of PRBs (I = 10) are maximized to 3, which is K-1, and the variance is maximized. The frequency diversity effect of each terminal on the VRB can be enhanced.

However, in the case of reference numeral 413, that is, in case of PRB allocation for cell # 2, the characteristic of the parameter K representing the interval between the distributed VRBs is broken by the 'mod' operation. That is, after allocating the second PRB, assigning the sixth PRB, having four PRB intervals, and allocating the 0th PRB, there is a problem that a K interval does not hold between the 0th PRB and the 2nd PRB. do. In addition, some positions where the distributed VRBs of each of cell # 0 and cell # 2 are mapped to PRBs are mapped identically to the 0 th PRB of each cell, thereby interfering with each other. This happens with the problem.

Thus, in order to maintain the property of maximizing the distance that each distributed VRB is distributed and mapped on the PRB, additional restrictions may be placed on the mapping rule.

In the following <second embodiment> will be described for solving this problem.

Second Embodiment

In Example 2 below, in the rule of Equation 3, the elements of the set L are all smaller than I, and L is limited to the position where the distributed VRB is mapped onto the PRB. Hereinafter, for convenience of explanation, it is referred to as 'condition 1'.

That is, in the following <Second Embodiment>, in order to restrict the mapping as in reference numeral 413 of the <Embodiment 1> from occurring, the mapping rule defined in the <Embodiment 1> is defined as 'element of the set L'. Adds the condition that all L is less than I each to a location where the distributed VRB is mapped onto the PRB 'to determine L anew. Accordingly, the rule for L changes as follows.

와 그 쉬프트 값들로서, 이는 <수학식 4>와 같이 표현 가능하다.That is

And the shift values, which can be expressed as in Equation 4.

Here, m is a value indicating the degree to which L is shifted, and L ₀ = L.

The m and the offset value unique to each cell have a relationship as shown in Equation 5 below to satisfy the condition 1.

As a result, the distributed VRBs can maintain the property of maximizing the distance that is dispersed and mapped on the PRB. As a result, the frequency diversity effect between cells on distributed VRB can be enhanced.

However, in this case, the amount of mutual interference between cells may increase.

In the second embodiment, each cell is restricted to have either L ₀ = {0, 4, 8} or L ₁ = {1, 5, 9} as L. That is, in the case of cell 2, that is, in the case of the third cell, the distributed VRB is configured in the same manner as cell # 0, which is the first cell with reference numeral 409, according to the mapping rule defined above.

Third Embodiment

In the following third embodiment, unlike the first and second embodiments, instead of the goal of maximizing the mapped distance by dispersing each distributed VRB on the PRB, the main goal is to reduce the inter-cell interference effect. Another mapping rule is proposed as follows.

The total number I of PRBs and the total number J of distributed VRBs are determined.

Here, the indexes indicating the positions of the PRBs are i = 0,... , I-1, and indexes representing each distributed VRB are j = 0,... , J-1. In addition, the total number of PRBs may be predetermined in consideration of a system band or the like, or may be determined by the base station and inform the terminal through signaling. The total number of distributed VRBs and the total number of local VRBs may be determined in consideration of the type of traffic currently to be transmitted by the base station scheduler, CQI feedback information of the terminal, or may use a predetermined value.

In this case, the parameter K representing the interval between the distributed VRBs may be determined through Equation 6.

However, [x] means the maximum integer not exceeding x.

Finally, the position L of the PRB to which the distributed VRB is mapped may be determined as in Equation 3 described above. Positions in PRBs other than the determined position L become PRBs to which local VRBs can be mapped.

5 shows a specific example according to a third embodiment of the present invention.

Referring to FIG. 5, the horizontal axis represents a frequency axis, 501 represents a PRB allocated by the base station for regional transmission, and 503, 505, and 507 represent a PRB allocated by the base station for distributed transmission and distributed VRB is actually mapped. Assume a total of three cells, cell # 0, cell # 1, and cell # 2, and the offsets for each cell are 0, 1, and 2, respectively. Hereinafter, only mapping of distributed VRBs is considered for convenience of description.

FIG. 5 assumes a total of 10 PRBs (I = 10) and 3 distributed VRBs (J = 3) in each cell. Therefore, the index i representing PRB can be 0, 1, 0, 9 (= I-1), and the index j representing distributed VRB is 0, 1, 2 (= J-1).

이 된다. 따라서 Offset 값을 반영한 각 셀의 분산 VRB가 매핑되는 PRB의 위치 L을 구하면 다음과 같다. 셀 #0에서 L은 <수학식 3>에 의해 {0,3,6}이 되고(참조부호 409), 셀#1에서 L은 {1, 4, 7} 가 되고(참조부호 411), 셀#2에서 L은 {2, 5, 8} 이 된다(참조부호 413). Accordingly, the parameter K is represented by Equation 6

Becomes Therefore, if the position L of the PRB to which the distributed VRB of each cell reflecting the offset value is mapped is obtained as follows. In cell # 0, L becomes {0,3,6} by Equation 3 (reference 409), and in cell # 1, L becomes {1, 4, 7} (reference 411), and the cell In # 2, L becomes {2, 5, 8} (reference 413).

Therefore, the location where the local VRB can be mapped to the PRB is a value other than L determined for each cell. That is, {1, 2, 4, 5, 7, 8, 9} in cell # 0, {0, 2, 3, 5, 6, 8, 9} in cell # 1, {0, 1 in cell # 2 , Local, VRB of each cell is mapped to RPBs of 3, 4, 6, 7, 9}.

As described above, by defining the position L of the PRBs to which the distributed VRBs are mapped, as shown by reference numeral 509, 511, and 513, the respective distributed VRBs are combined within a total number (I = 10) of the given PRBs. The distance mapped and distributed on the PRB is maintained by 2, which is K-1.

When the mapping rule according to the third embodiment is applied, the respective distributed VRBs are distributed on the PRB compared to the first and second embodiments under the same assumption, so that the maximum mapped distance is reduced from 1 to 3 by 2. However, in any cell, the distance is maintained at 2, thereby reducing the influence of mutual interference between adjacent cells.

In other words, in the third embodiment, although the dispersion is smaller on the PRBs between the distributed VRBs than the first or second embodiments, since the interference between the cells does not exist, the terminal may perform signal reception performance. This has a good advantage.

In the following fourth and fifth embodiments, a method of more specifically defining how to configure and map a specific distributed VRB to a PRB will be described.

Fourth Embodiment

First, the base station determines the total number of available PRBs (I) and the number of distributed VRBs (J). At this time, the index indicating the position of each PRB is i = 0,... , I-1 and the indices representing the respective distributed VRBs are j = 0,... , Represented by J-1.

In this case, the number of PRBs may be predetermined according to a system bandwidth, or may be determined by the base station and inform the terminal through signaling. The number of distributed VRBs and the number of local VRBs may be determined or used as a predetermined value in consideration of the type of traffic to be currently transmitted by the base station scheduler, CQI feedback information of the terminal, and the like.

The PRB and distributed VRB are divided into blocks of smaller units. The indexes representing the respective small resource blocks constituting the PRB are k = 0, 1,... , k-1, and the indexes representing each small resource block constituting distributed VRB are l = 0, 1,... , l-1, denotes the k-th small resource block in the i-th PRB as PRB _{i, k} , and denotes the l-th small resource block in the j-th distributed VRB as DVRB _{j, l} .

The scheduler determines which PRB to map the distributed VRB and local VRB to according to a predefined rule.

A rule for mapping the DVRB _{j, l} to the PRB _{i, k} allocated for distributed VRB, wherein i is determined by the predefined rule, and DVRB _{j is} as follows in the k th small resource block for each i. _{, l} is mapped.

■ For the first PRB _{i, k} (= DVRB _{j, 0} ) allocated for distributed VRBs,

DVRB _{j , 0} ⇒ PRB _{i , k} (j = k = 0, 1,…)

■ For the second PRB _{i, k} (= DVRB _{j, 1} ) assigned for distributed VRB,

DVRB _{j , 1} ⇒ PRB _{i , k} (j = k = 0, 1,…)

For the third PRB _{i, k} (= DVRB _{j, 2} ) allocated for distributed VRB,

DVRB _{j , 2} ⇒ PRB _{i , k} (j = k = 0, 1,…)

With the same rule as above, the last PRB _{i, k} allocated for distributed VRB is mapped to small resource blocks of distributed VRB.

7 is a diagram illustrating how to configure and map distributed VRBs to PRBs allocated for distributed VRBs according to the above rules.

In FIG. 6, the horizontal axis represents the frequency axis, reference numeral 601 denotes distributed VRBs allocated by the base station for distributed transmission, and reference numeral 605 denotes all PRBs available to the base station. Here, the distributed VRBs are mapped to 0th, 4th, and 8th PRBs. For convenience of explanation, only the mapping of distributed VRBs will be considered below. 6 is composed of k = 3 and l = 3 small resource blocks, respectively, in a situation where there are 10 PRBs in total (I = 10) and 3 VRVs in total (J = 3).

Accordingly, the index representing the PRB is i = 0, 1,... , 9 (= I-1), k = 0, 1, 2 (= k-1), and the index representing the variance VRB is j = 0, 1, 2 (= J-1), and l = 0, 1, 2 (= l-1).

Accordingly _, the result of mapping the DVRB _{j, l} to the PRB _{i, j} allocated for distributed VRB according to the defined rule is as shown in FIG. 6.

PRB _0,0 = DVRB _0,0 , PRB _0,1 = DVRB _1,0 , PRB _0,2 = DVRB _2,0 ,

PRB _{4 , 0} = DVRB _{0 , 1} , PRB _{4 , 1} = DVRB _{1 , 1} , PRB _{4 , 2} = DVRB _{2 , 1} ,

PRB _{8 , 0} = DVRB _{0 , 2} , PRB _{8 , 1} = DVRB _{1 , 2} , PRB _{8 , 2} = DVRB _{2 , 2}

By defining the mapping rule as described above, the information necessary for the UE to know the resource mapping position of the base station requires the total number J of distributed VRBs and the total number l of small resource blocks in the distributed VRB, or an equivalent thereof. Do.

Accordingly, the base station signals the information on the number to the terminal, so that both the base station and the terminal can calculate the exact mapping position of each distributed VRB on the PRB according to a common rule. The signaling may be physical layer signaling or higher layer signaling.

However, in the mapping as shown in FIG. 6, that is, when a PRB composed of M consecutive subcarriers is divided into k small resource blocks and mapped to distributed VRBs, an integer multiple relationship between M and k is established. The k small resource blocks of are all kept the same in M / k, but each k small resource blocks are not kept the same in size unless an integer multiple relationship is established between M and k. It does not have the disadvantage.

Therefore, it becomes difficult to generalize the mapping rule for mapping the distributed VRB to each of the k small resource blocks, which further increases the complexity and requires additional signaling overhead correspondingly.

In order to solve this problem, a method of reducing signaling overhead and dividing the PRB composed of the M consecutive subcarriers into k small resource blocks will be proposed to facilitate the mapping relationship between distributed VRBs.

<Fifth Embodiment>

7 proposes another method for configuring and mapping a distributed VRB in a PRB according to the present invention.

First, the base station determines the total number I of total usable PRBs and the total number J of distributed VRBs. At this time, the index indicating the position of each PRB is i = 0,... , I-1 and the indices representing the respective distributed VRBs are j = 0,... , J-1. Here, the total number of PRBs may be predetermined in consideration of a system band or the like, or may be determined by the base station and inform the terminal through signaling.

Here, the total number of distributed VRBs and the total number of local VRBs may be determined in consideration of the type of traffic currently to be transmitted by the base station scheduler, CQI feedback information of the terminal, or may use a predetermined value.

The PRB and distributed VRB are divided into resource blocks of smaller units. The indexes representing each small resource block constituting the PRB are k = 0, 1,... , k -1, and the indexes representing each small resource block constituting distributed VRB are l = 0, 1,... , L-1, denotes the k-th small resource block in the i-th PRB as PRB _{i, k} , and the l-th small resource block in the j-th distributed VRB as DVRB _{j, l} .

The scheduler determines which PRB to map the distributed VRB and local VRB to according to a predefined rule.

In order to map the DVRB _{j, l} to PRB _{i, j} allocated for distributed VRB, a virtual buffer is assumed. The size of the virtual buffer is equal to the sum of the sizes of PRBs to which distributed VRBs are mapped. That is, if one PRB is composed of M consecutive subcarriers, and a total of D PRBs to which distributed VRBs are mapped are allocated, the size of the virtual buffer 707 is M × D.

인 관계를 만족한다. Hereinafter, when the DVRB _{j, l} represents a position mapped to the virtual buffer as x, the DVRB _{j, l} is mapped at a uniform interval as much as the J as possible.

Satisfy the relationship.

In order to actually map DVRB _{j, l} mapped to the virtual buffer to PRB _{i, j} allocated for distributed VRB as described above, data of M corresponding to PRB size are sequentially read from the virtual buffer and sequentially Map it.

By defining the mapping rule as described above, the distributed VRBs are mixed as much as possible in one PRB to increase frequency diversity gain, and also between the size M of the PRB and the number K of small resource blocks in the PRB. The complexity that occurs when an integer multiple relationship is not established can be reduced.

Referring to FIG. 7, which is a preferred embodiment of the present invention to which the above-described mapping rule is applied, in FIG. 7, the horizontal axis represents a frequency axis, reference numeral 701 denotes a distributed VRB allocated by a base station for distributed transmission, and reference numeral 705 Represents a PRB allocated by a base station for local transmission.

In the 0th, 4th, and 8th PRBs, each distributed VRB is distributed for each subcarrier or in a predetermined subcarrier unit, and each distributed subcarrier units are sequentially set according to the order of the VRB. Each distributed VRB sequentially maps subcarriers sequentially distributed according to one PRB size. 7 shows that distributed VRBs are being mapped.

In FIG. 7, a total of 10 PRBs (I = 10) and a total of 3 distributed VRBs (J = 3) are composed of k = 15 and l = 15 small resource blocks, respectively. In this case, a total of three PRBs (D = 3) to which the distributed VRBs are mapped. Therefore, the index representing PRB is i = 0, 1, ..., 9 (= I-1), k = 0, 1, ..., 14 (= k-1), and the index representing distributed VRB is j. = 0, 1, 2 (= J-1), l = 0, 1, ..., 14 (= l-1). In addition, assuming that one PRB is composed of 15 (M = 15) consecutive subcarriers, the size of a small resource block in the PRB is 1 (= M / k), that is, the minimum unit in the frequency domain. Becomes a subcarrier.

In order to map the DVRB _{j, l} to PRB _{i, j} allocated for distributed VRB, the present invention includes a virtual buffer 707.

인 규칙을 적용하여 구한다. 따라서 상기 DVRB_j,l는 가상 버퍼(707)에 다음과 같이 매핑된다. The size of the virtual buffer 707 is 45 (= MxD = 15x3) as the sum of the PRBs to which the distributed VRBs are mapped. The DVRB _{j, l} are such that x is the position, the DVRB mapping away _{j, l} at uniform intervals as much as possible by the J = 3 is mapped to the virtual buffer (707)

Obtained by applying the rules. Accordingly, the DVRB _{j, l} is mapped to the virtual buffer 707 as follows.

DVRB _{0 , 0} ⇒ VB ₀ , DVRB _{0 , 1} ⇒ VB ₃ , ... ..., DVRB _{0 , 14} ⇒ VB ₄₂

DVRB _{1 , 0} ⇒ VB ₁ , DVRB _{1 , 1} ⇒ VB ₄ , ... ..., DVRB _{1 , 14} ⇒ VB ₄₃

DVRB _{2 , 0} ⇒ VB ₂ , DVRB _{2 , 1} ⇒ VB ₅ , ... ..., DVRB _{2 , 14} ⇒ VB ₄₄

Subsequently, in order to actually map DVRB _{j, l} mapped to the virtual buffer 707 to PRB _{i, j} allocated for distributed VRB as described above, 15 (M) corresponding to the PRB size sequentially in the virtual buffer 707. = 15) Read as much data and sequentially map to PRB.

That is, the data from the positions 0 to 14 of the virtual buffer 707 (reference number 709) is mapped to the 0 th PRB, and the data from the positions 14 to 29 of the virtual buffer 707 (reference number 711) to the fourth PRB. The data is mapped to positions 30 to 44 of the virtual buffer 707 (reference numeral 713) in the eighth PRB.

That is, according to the present invention, each distributed VRB is divided into small resource blocks, for example, subcarriers, and the divided subcarriers are dropped and mixed at a predetermined interval in the virtual buffer 707, and the subcarriers are mapped. The virtual resource blocks, which are mixed and sequentially mapped, are sequentially distributed according to the size of the set physical resource block and allocated to the corresponding physical resource blocks. In this case, the virtual resource blocks are distributed and mapped by the number of distributed VRBs according to the size of the physical resource block.

In other words, if each distributed VRBs are distinguished into small resource blocks, that is, for example, the 0th VRB is 0, 1,2,3,4,5,6,7,8,9,10,11 12, 13, 14, the first VRB is divided into 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, and the second VRB Is divided into 15 small resource blocks, respectively, 30,31,32,33,34,35,36,37,38,39,40,41,42,43,44.

In this case, according to the present invention, each distributed VRB is 0, 15, 30, 1, 16, 31, 2, 17, 32, 3, 18, 33, 4, 19, 34, 5, 20, 35,... In order, small resource blocks of different distributed VRBs are mapped to the virtual buffer with a predetermined spacing alternately one by one. That is, it can be seen that small resource blocks in the same distributed VRB are distributed and mapped to the virtual buffer with a predetermined separation distance.

In addition, small resource blocks arranged according to the mapping rule are sequentially spaced apart from each other at a predetermined distance according to PRB distribution according to the size of one resource block of the PRB.

Accordingly, the present invention not only provides diversity between each distributed VRB, but also distributedly maps small mixed resource blocks of the distributed VRB to guarantee diversity, having a predetermined distance on the PRB, to distribute the frequency at the time of data transmission. This has the advantage of ensuring diversity gain as much as possible.

By defining the mapping rule as described above, in order for the UE to know the resource mapping position of the base station, necessary information needs a total number J of distributed VRBs and a size M of a PRB or an equivalent thereof. Therefore, the base station signals the information on the number to the terminal, so that both the base station and the terminal can calculate the exact mapping position of each distributed VRB on the PRB according to a common rule. The signaling may be physical layer signaling or higher layer signaling. The total number of PRBs may be predetermined in consideration of a system band and the like.

Hereinafter, a transmitter and a receiver according to the present invention will be described. The following transmitting apparatus and receiving apparatus can be commonly applied to the first embodiment, the second embodiment, and the third embodiment.

8 is a diagram illustrating a structure of a transmission device according to a preferred embodiment of the present invention.

Referring to FIG. 8, in order for the base station to transmit data 802 to be sent to the terminal 1, the data is channel coded in the encoder 604. As the encoder 804, a convolutional encoder, a turbo encoder, a low density parity check (LDPC) encoder, and the like are used. For the channel coded signal, the modulator 806 performs modulation such as Quadrature Phase Shift Keying (QPSK), 8-ary PSK (8PSK), 16-ary Quadrature Amplitude Modulation (16QAM), and 64-QAM (64-ary QAM). modulation). A rate matching block may be further provided between the encoder 804 and the modulator 806 to perform a function such as repetition and puncturing.

A serial to parallel converter 808 receives the output of the modulator 806 as an input and serves to make the signals in parallel. The radio resource mapper 810 maps the received signal to the radio resource allocated by the scheduler 854.

The scheduler 854 performs radio resource allocation in consideration of the scheduling request information and channel state of the terminal. In this case, the distributed VRBs and the local VRBs are allocated to the corresponding PRBs according to the mapping rules of the first to third embodiments. And the PRBs are allocated to the terminals according to the transmission scheme of the mapped VRBs.

Accordingly, the scheduler 854 according to Equation 1 to Equation 5 representing mapping rules according to the first and second embodiments, L in cell # 0 is {0, 4, 8}, L becomes {1, 5, 9} in cell # 1, and L is scheduled to be {0, 2, 6} in cell # 2. Meanwhile, in the distributed transmission mapping rule according to the third embodiment, L is {0, 3, 6} in cell # 0 using Equation 6 and Equation 3, and L in cell # 1 is { 1, 4, 7}, and L in cell # 2 is {2, 5, 8}.

In this case, parameter information necessary to apply the mapping rule of the distributed resource block for the first to third embodiments, that is, the index i representing the PRB and the index j representing the distributed VRB are signaled to the receiving device.

In addition, according to the fourth to fifth embodiments, the scheduler 854 performs radio resource allocation in consideration of the scheduling request information and the channel state of the terminal. According to the fourth to fifth embodiments of the present invention, the radio resource mapper 810 uses a method in which distributed VRBs are mapped in a PRB allocated for VRBs. Also, map the distributed VRB and local VRB to PRBs properly. That is, it can be seen that small resource blocks in the same distributed VRB are distributed and mapped to the virtual buffer with a predetermined separation distance.

In addition, small resource blocks arranged according to the mapping rule are sequentially spaced apart from each other at a predetermined distance according to PRB distribution according to the size of one resource block of the PRB. The remaining PRBs then properly map local VRBs.

At this time, the total number J of distributed VRBs and the size M of PRBs or the equivalent thereof, which are information required to apply the mapping rule of the present invention, are signaled to the receiving device.

The data multiplexer 812 multiplexes data signals to be sent to terminals (terminals # 1 to terminal # 3) belonging to the base station. For example, the data 826 to be sent to the terminal k is transmitted to the multiplexer 812 through the encoder 828, the modulator 830, the serial / parallel converter 832, and the radio resource mapper 634. Is entered. That is, the data multiplexer 812 multiplexes and outputs data signals transmitted to other terminals of each cell.

The control information 836 necessary for the terminal to demodulate and decode the data signal passes through an encoder 838, a modulator 840, and a serial to parallel converter 842, and then to the radio resource mapper 844. This is mapped to a radio resource allocated by the scheduler 854 or to a predefined radio resource. There may be a plurality of channels for transmitting the control information for each characteristic of the control information.

The pilot 846 signal for channel estimation passes through the modulator 848 and the serial / parallel converter 850 and then is mapped or pre-arranged to the radio resource allocated by the scheduler 854 by the radio resource mapper 652. It is mapped to the defined radio resource.

When the control information or the pilot is allocated to a predefined radio resource, the information on the radio resource may be known to the terminal as system information in a call setup or reconfiguration step between the terminal and the base station. Alternatively, the distributed VRB and the local VRB may be appropriately mapped to the control information or the pilot according to the above-described mapping rule.

In the distributed transmission scheme according to the present invention, the distributed VRB is mapped in the PRB allocated for the distributed VRB as shown in FIG. 7.

The multiplexer 814 multiplexes the data signal, control information, and pilot signal allocated to a radio resource determined according to a mapping rule.

An Inverse Fast Fourier Transform (IFFT) block 816 receives the multiplexed signal as an input and performs an IFFT operation.

The output of the IFFT block is converted in parallel / serial converter 818.

The cyclic reception code adder 820 adds a cyclic prefix (CP) to the output signal of the parallel / serial converter 818, and the RF (Radio Frequency) transmitter 822 transmits the RF signal. Process it and send it.

9 is a diagram illustrating a receiving device structure of a terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 9, the terminal removes the CP from the received signal and converts the serial signals input from the serial / parallel converter 904 in parallel.

After performing the FFT operation in the FFT block 906, the demapper 907 extracts data allocated to the terminal, pilot control information, and the like and converts the serial signal into a parallel signal in the parallel / serial converter 908. Demultiplexer 909 classifies data, pilot, control information, and the like.

Channel estimator 912 extracts the pilot signal from demultiplexer 909 to obtain channel estimates.

The channel equalizer 918 performs channel compensation on the received signal using the obtained channel estimate. The channel-compensated signal finally acquires data by performing demodulation and decoding through the demodulator 920 and the decoder 922 using separate control information received by the terminal.

In the demodulation and decoding step, data to be demodulated and decoded can be properly extracted according to the same rules as the mapping rules of the distributed VRB and the local VRB defined by the transmitter.

That is, the demodulator calculates the exact mapping position of each distributed VRB allocated to itself on the PRB by using the total number J of distributed VRBs received and the size M of the PRB to know the resource mapping position of the base station. Demodulates the data symbols. The demodulated symbol is decoded so that the receiving device obtains a transmission data symbol.

The parameter information necessary for demodulating and decoding the transmission symbols according to the mapping rule, that is, the total number J of distributed VRBs and the number of divided subcarriers L of the distributed virtual resource blocks L corresponding to the size M or the equivalent of the PRBs is determined from the transmitting apparatus. The signal is received and used by the receiving device to demodulate and decode.

Here, the demapper 907 may extract data to be demodulated and decoded according to the same rule as the mapping rule of the distributed VRB and the local VRB defined by the transmitter. Parameter information necessary for applying the rule of the transmitting device is signaled from the transmitting device.

As an example, the receiving apparatus receives the index i representing PRB and the index j representing distributed VRB, which are parameter information necessary to apply the mapping rule for the first and third embodiments of the present invention. In addition, the index i and the index j, and the information on the mapping rule used by the transmitting device, that is, whether the information about whether to apply the first embodiment or the third embodiment is signaled.

Therefore, the receiving device acquires a radio resource allocated to itself by using Equations 1 to 6 using the obtained parameters. The data symbol is obtained by demodulating and decoding the obtained radio resource.

In the first to second embodiments, if the terminal is the terminal of cell # 0, the terminal acquires data from the radio resource of {0, 4, 8}, and in the case of cell # 1, {1, 5 , 9}, in the case of cell # 2, data is obtained by demodulating and decoding data from a radio resource of {0, 2, 6}.

Further, according to the third embodiment, the distributed transmission mapping rule is based on Equation 6 and Equation 3 from {0, 3, 6} for the terminal of cell # 0, and for cell # 1. From {1, 4, 7}, in case of cell # 2, data is obtained from a radio resource of {2, 5, 8}. In addition, as described above, the parameters transmitted from the transmitting apparatus are considered in consideration of the system band of the transmitting apparatus, the traffic type to which the scheduler of the transmitting apparatus is currently transmitting, CQI information fed back from the terminals in the cell, and the like. Include the determined parameters.

In addition, in the case of the fourth embodiment or the fifth embodiment, data is obtained by demodulating and decoding data from a VRB which is distributed for each subcarrier or in a predetermined subcarrier unit from the 0th, 4th, and 8th PRBs.

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 defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

The present invention has the advantage of using a local transmission method and a distributed transmission method together in an OFDM-based communication system, in which a base station efficiently allocates radio resources in consideration of channel conditions fed back from terminals and traffic types of the base station.

This invention minimizes mutual interference of multiple cells of a base station and provides maximum frequency diversity. That is, it is possible to prevent performance deterioration due to mutual interference between cells, thereby improving reception performance of the terminal.

In addition, by distributing and allocating subcarriers of each of the plurality of distributed virtual resource blocks to physical resource blocks, there is an effect of maximizing a frequency diversity gain for data transmitted from a corresponding terminal.

Claims (64)

A method for allocating radio resources of a transmitting device in an orthogonal frequency division multiple access system, Determining a number (I) of physical resource blocks (PRBs), which are mapping units of a physical channel, and a number (J) of distributed virtual resource blocks (DVRBs) to be used in a distributed transmission scheme, Determining a parameter K representing the separation interval between the DVRBs using the I and the J; Sequentially mapping the J DVRBs to the J first PRBs having the K spacing interval among the I PRBs; Mapping local virtual resource blocks (LVRBs) to be used as a local transmission scheme to (I-J) second PRBs except the first PRBs among the I PRBs; And allocating the PRBs to at least one terminal according to a transmission scheme of the mapped DVRBs and LVRBs. The method of claim 1, wherein the first PRBs, Starting with a PRB having a unique offset corresponding to a specific cell of the I PRB, the radio resource allocation method characterized in that it has an increasing index with the K interval. The method of claim 1, wherein the first PRBs, Wireless resource allocation method characterized in that it has an index calculated through the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, and L _j is an index of the PRB to which the j-th DVRB is mapped. The method of claim 1, wherein the first PRBs, Wireless resource allocation method characterized in that it has an index calculated through the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, L _j is an index of PRB to which j-th DVRB is mapped, and m is a shift value of L. The method of claim 1, wherein the first PRBs, Wireless resource allocation method characterized in that it has an index calculated through the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, and L _j is an index of the PRB to which the j-th DVRB is mapped. The method of claim 1, And signaling the number (I) of the PRBs and the number (J) of the DVRBs to the at least one terminal. A transmitting apparatus for allocating radio resources in an orthogonal frequency division multiple access system, The number I of physical resource blocks (PRBs), which are mapping units of a physical channel, and the number J of distributed virtual resource blocks (DVRBs) to be used in a distributed transmission scheme, are determined, and the I and J are used. Determining a parameter K indicating a separation interval between the DVRBs, sequentially mapping the J DVRBs to J first PRBs having the K separation interval among the I PRBs, and among the I PRBs A scheduler that maps local virtual resource blocks (LVRBs) for use as a local transmission scheme to (IJ) second PRBs except for the first PRBs; And a mapper for allocating the PRBs to at least one terminal according to a transmission scheme of the mapped DVRBs and LVRBs under the control of the scheduler. The method of claim 7, wherein the scheduler, The number (I) of the PRBs and the number (J) of the DVRBs are determined in consideration of the available system band of the transmitting apparatus, the type of data traffic to be transmitted, and the respective channel state information fed back from a plurality of terminals. And a radio resource allocation device. Claim 9 was abandoned upon payment of a set-up fee. The method of claim 7, wherein the scheduler, The first PRBs are controlled to have increasing indices with the K interval, starting with a PRB having a unique offset corresponding to a specific cell among the I PRBs. Device. Claim 10 was abandoned upon payment of a setup registration fee. The method of claim 7, wherein the first PRBs, And a transmitter calculated by the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, and L _j is an index of the PRB to which the j-th DVRB is mapped. Claim 11 was abandoned upon payment of a setup registration fee. The method of claim 7, wherein the first PRBs, And a transmitter calculated by the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, L _j is an index of PRB to which j-th DVRB is mapped, and m is a shift value of L. Claim 12 was abandoned upon payment of a registration fee. The method of claim 7, wherein the first PRBs, And a transmitter calculated by the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, and L _j is an index of the PRB to which the j-th DVRB is mapped. Claim 13 was abandoned upon payment of a registration fee. The method of claim 7, wherein And a transmitter for signaling the number (I) of the PRBs and the number (J) of the DVRBs to the at least one terminal. In the orthogonal frequency division multiple access system, a method for receiving a radio resource of the receiving device, Receiving a signal (I) of physical resource blocks (PRBs), which are mapping units of a physical channel, and a number (J) of distributed virtual resource blocks (DVRBs) for use in a distributed transmission scheme, Determining a parameter K indicating the separation interval between the DVRBs using the I and the J, and J DVRBs sequentially mapped with the K separation interval among the I PRBs from the first PRBs, Obtaining mapped Local Virtual Resource Blocks (LVRBs) from the second PRBs for use as the remaining (IJ) local transmission schemes except for the first PRBs among the I PRBs; And acquiring transmission data from the PRBs according to transmission methods of the mapped DVRBs and LVRBs. The method of claim 14, Acquiring the transmission data by demodulating and decoding the first PRBs having indexes increasing with the K interval, starting from a PRB having a unique offset corresponding to a specific cell among the I PRBs Wireless resource allocation method characterized in that it further comprises. The method of claim 14, wherein the first PRBs, Wireless resource allocation method characterized in that it has an index calculated by the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, and L _j is an index of the PRB to which the j-th DVRB is mapped. The method of claim 14, wherein the first PRBs, Wireless resource allocation method characterized in that it has an index calculated by the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, L _j is an index of PRB to which j-th DVRB is mapped, and m is a shift value of L. The method of claim 14, wherein the first PRBs, Wireless resource allocation method characterized in that it has an index calculated by the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, and L _j is an index of the PRB to which the j-th DVRB is mapped. The method of claim 14, And estimating channel quality information for each PRB and feeding back to the transmitting apparatus. In the receiving device to which radio resources are allocated in an orthogonal frequency division multiple access system, The DVRBs are obtained by using the number I of physical resource blocks (PRBs), which are mapping units of a physical channel signaled from a transmitting device, and the number J of distributed virtual resource blocks (DVRBs) to be used in a distributed transmission scheme. Determine a parameter K representing a spacing interval between the first and second DVRBs sequentially mapped with the K spacing interval from the first PRBs, and the first PRBs among the I PRBs. A de-mapper that obtains mapped local virtual resource blocks (LVRBs) from second PRBs for use as the remaining (IJ) local transmission schemes, A demodulator for demodulating the PRBs according to transmission methods of the mapped DVRBs and LVRBs; And a decoder for decoding the transmission data from the demodulated PRBs. Claim 21 was abandoned upon payment of a registration fee. The method of claim 20, wherein the first PRBs, Receiving apparatus having an index calculated through the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, and L _j is an index of the PRB to which the j-th DVRB is mapped. Claim 22 was abandoned upon payment of a registration fee. The method of claim 20, wherein the first PRBs, Receiving apparatus having an index calculated through the following equation.

here,

Is a maximum integer not exceeding x, the offset is a unique value for each cell, L _j is an index of PRB to which j-th DVRB is mapped, and m is a shift value of L. Claim 23 was abandoned upon payment of a set-up fee. The method of claim 20, wherein the first PRBs, Receiving apparatus having an index calculated through the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, and L _j is an index of the PRB to which the j-th DVRB is mapped. The method of claim 20, And a transceiver for estimating channel quality information for each PRB and feeding it back to a transmitting device. A radio resource allocation method in an orthogonal frequency division multiple access system, Determining the number (I) of physical resource blocks (PRBs), which are mapping units of a physical channel, and the number (J) of distributed virtual resource blocks (DVRBs) to be used in a distributed transmission method, wherein the PRB and the DVRB Consists of k and l subcarriers, Sequentially mapping the J DVRBs to first PRBs having a K spacing interval among the I PRBs; Subcarriers of the DVRBs may be mapped to subcarriers having the l spacing interval among the subcarriers constituting the J DVRBs to be mapped to mutually adjacent subcarriers within the first PRBs. Mapping to subcarriers in the Mapping local virtual resource blocks (LVRBs) to be used as a local transmission scheme to (I-J) second PRBs except the first PRBs among the I PRBs; And allocating the PRBs to at least one terminal according to a transmission scheme of the mapped DVRBs and LVRBs. The method of claim 25, The first PRB is divided into the same number of small resource blocks as k, the DVRB is divided into the same number of small resource blocks, and And mapping small resource blocks of each of the DVRBs to the small resource blocks of the first PRB sequentially with the same separation interval from each other. The method of claim 26, K and l are the same integer. The method of claim 25, The virtual resource block (VRB), which is divided into the DVRB and the LVRB, has the same integer multiple as the product of the product of the number J of the DVRBs and the number of small resource convexes of the DVRB. How to allocate radio resources. The method of claim 25, The subcarriers having the l spaced interval among the subcarriers constituting the J DVRBs are spaced at intervals of the number J of the DVRBs. Claim 30 was abandoned upon payment of a registration fee. Starting with a PRB having a unique offset corresponding to a specific cell of the I PRB, the radio resource allocation method characterized in that it has an increasing index with the K interval. Claim 31 was abandoned upon payment of a registration fee. The method of claim 25, wherein the first PRBs, Wireless resource allocation method characterized in that it has an index calculated through the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, and L _j is an index of the PRB to which the j-th DVRB is mapped. Claim 32 was abandoned upon payment of a registration fee. The method of claim 25, wherein the first PRBs, Wireless resource allocation method characterized in that it has an index calculated through the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, L _j is an index of PRB to which j-th DVRB is mapped, and m is a shift value of L. Claim 33 was abandoned upon payment of a registration fee. The method of claim 25, wherein the first PRBs, Wireless resource allocation method characterized in that it has an index calculated through the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, and L _j is an index of the PRB to which the j-th DVRB is mapped. Claim 34 was abandoned upon payment of a registration fee. The method of claim 25, And signaling the number (I) of the PRBs and the number (J) of the DVRBs to the at least one terminal. A radio resource allocation apparatus in an orthogonal frequency division multiple access system, The number I of physical resource blocks (PRBs) consisting of k subcarriers, which are mapping units of a physical channel, and the number of distributed virtual resource blocks (DVRBs) to be used in a distributed transmission method consisting of l subcarriers ( J),  The J DVRBs are sequentially mapped to the first PRBs having a K spacing interval among the I PRBs, and wherein the l spacings are spaced from each other among subcarriers constituting the J DVRBs. Map subcarriers of the DVRBs to subcarriers of the first PRBs such that subcarriers are mapped to mutually adjacent subcarriers within the first PRBs, A scheduler that maps local virtual resource blocks (LVRBs) to be used as a local transmission scheme to (I-J) second PRBs except the first PRBs among the I PRBs; And a mapper for allocating the PRBs to at least one terminal according to a transmission scheme of the mapped DVRBs and LVRBs. Claim 36 was abandoned upon payment of a registration fee. The method of claim 35, wherein The first PRB is divided into the same number of small resource blocks as k, the DVRB is divided into the same number of small resource blocks, and And the scheduler for sequentially mapping the small resource blocks of each of the DVRBs to the small resource blocks of the first PRB with the same separation interval from each other. Claim 37 was abandoned upon payment of a registration fee. The method of claim 36, And k and l are the same integer. Claim 38 was abandoned upon payment of a registration fee. The method of claim 35, wherein The virtual resource block (VRB), which is divided into the DVRB and the LVRB, has an integer multiple of the same value as the product of the product of the number J of the DVRBs and the number L of small resource convexes of the DVRB. Radio resource allocation device. Claim 39 was abandoned upon payment of a registration fee. The method of claim 35, wherein And among the subcarriers constituting the J DVRBs, subcarriers having a l spacing interval therebetween are spaced at intervals of the number J of the DVRBs. Claim 40 was abandoned upon payment of a registration fee. The method of claim 35, wherein the first PRBs, The radio resource allocation apparatus of claim 1, wherein the PRBs have indices that increase with a spaced interval of K, starting with a PRB having a unique offset corresponding to a specific cell. Claim 41 was abandoned upon payment of a set-up fee. The method of claim 35, wherein the first PRBs, Radio resource allocation apparatus characterized in that it has an index calculated through the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, and L _j is an index of the PRB to which the j-th DVRB is mapped. Claim 42 was abandoned upon payment of a registration fee. The method of claim 35, wherein the first PRBs, Radio resource allocation apparatus characterized in that it has an index calculated through the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, L _j is an index of PRB to which j-th DVRB is mapped, and m is a shift value of L. Claim 43 was abandoned when the set registration fee was paid. The method of claim 35, wherein the first PRBs, Radio resource allocation apparatus characterized in that it has an index calculated through the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, and L _j is an index of the PRB to which the j-th DVRB is mapped. Claim 44 was abandoned upon payment of a set-up fee. The method of claim 35, wherein And signaling the number (I) of the PRBs and the number (J) of the DVRBs to the at least one terminal. A method for receiving radio resource allocation in an orthogonal frequency division multiple access system, Receiving a signal (I) of physical resource blocks (PRBs), which are mapping units of a physical channel, and a number (J) of distributed virtual resource blocks (DVRBs) for use in a distributed transmission method, wherein the PRB and the DVRB Consists of k and l subcarriers, Obtaining the J DVRBs sequentially mapped to the first PRBs having a K spacing interval among the I PRBs from the first PRBs, wherein the subcarriers constituting the J DVRBs Subcarriers having the l spacing interval between the subcarriers of the DVRBs are mapped to the subcarriers of the first PRBs so that the subcarriers having the l spacing interval therebetween are mapped to mutually adjacent subcarriers within the first PRBs, Obtaining Local Virtual Resource Blocks (LVRBs) mapped from the second PRBs for use as the remaining (I-J) local transmission schemes except for the first PRBs among the I PRBs; And acquiring transmission data from the PRBs according to transmission methods of the mapped DVRBs and LVRBs. The method of claim 45, The first PRB is divided into small resource blocks equal to k, and the DVRB is divided into small resource blocks equal to l, And the small resource blocks of each of the DVRBs have the same separation interval from each other, and are sequentially mapped to the small resource blocks of the first PRB. The method of claim 45, And k and l are the same integer. The method of claim 45, The virtual resource block (VRB), which is divided into the DVRB and the LVRB, has the same integer multiple as the product of the product of the number J of the DVRBs and the number of small resource convexes of the DVRB. How to get wireless resource allocation. The method of claim 45, The subcarriers having the l spacing interval among the subcarriers constituting the J DVRBs are spaced at intervals of the number J of the DVRBs. Claim 50 was abandoned upon payment of a set-up fee. The method of claim 45, wherein the first PRBs, The radio resource allocation method of claim 1, wherein the PRBs have indices that increase with a K interval, starting with a PRB having a unique offset corresponding to a specific cell. Claim 51 was abandoned upon payment of a registration fee. The method of claim 45, wherein the first PRBs, Wireless resource allocation method characterized in that it has an index calculated by the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, and L _j is an index of the PRB to which the j-th DVRB is mapped. Claim 52 was abandoned upon payment of a registration fee. The method of claim 45, wherein the first PRBs, Wireless resource allocation method characterized in that it has an index calculated by the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, L _j is an index of PRB to which j-th DVRB is mapped, and m is a shift value of L. Claim 53 was abandoned upon payment of a set-up fee. The method of claim 45, wherein the first PRBs, Wireless resource allocation method characterized in that it has an index calculated by the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, and L _j is an index of the PRB to which the j-th DVRB is mapped. Claim 54 was abandoned upon payment of a setup registration fee. The method of claim 45, And estimating channel quality information for each PRB and feeding back to the transmitting apparatus. In a receiving device receiving radio resource allocation in an orthogonal frequency division multiple access system, By using the number I of physical resource blocks (PRBs), which are mapping units of the physical channels signaled from the transmitting apparatus, and the number J of distributed virtual resource blocks (DVRBs) to be used in a distributed transmission scheme, the PRB And the DVRB consists of k and l subcarriers, respectively. The J DVRBs sequentially mapped to the first PRBs having a K spacing interval among the I PRBs are obtained from the first PRBs, and among the subcarriers constituting the J DVRBs, Subcarriers of the DVRBs are mapped to subcarriers of the first PRBs such that subcarriers having a spacing interval of l are mapped to mutually adjacent subcarriers within the first PRBs. A de-mapper that obtains local virtual resource blocks (LVRBs) from second PRBs mapped to be used as (IJ) local transmission schemes except for the first PRBs among PRBs; A demodulator for demodulating the PRBs according to transmission methods of the mapped DVRBs and LVRBs; And a decoder for decoding the transmission data from the demodulated PRBs. Claim 56 was abandoned upon payment of a setup registration fee. The method of claim 55, The first PRB is divided into the same number of small resource blocks as k, the DVRB is divided into the same number of small resource blocks, and And the demapper confirming that the small resource blocks of each of the DVRBs have the same separation interval from each other and are sequentially mapped to the small resource blocks of the first PRB. Claim 57 was abandoned upon payment of a setup registration fee. The method of claim 55, And k and l are the same integer. Claim 58 was abandoned upon payment of a registration fee. The method of claim 55, The virtual resource block (VRB), which is divided into the DVRB and the LVRB, has an integer multiple of the same value as the product of the product of the number J of the DVRBs and the number L of small resource convexes of the DVRB. Receiving device. Claim 59 was abandoned upon payment of a setup registration fee. The method of claim 55, And receiving subcarriers having a l spacing interval among the subcarriers constituting the J DVRBs, being spaced at intervals of the number J of the DVRBs. Claim 60 was abandoned upon payment of a setup registration fee. The receiving apparatus of claim 1, wherein the PRBs have indices that increase with a spaced interval of K, starting from a PRB having a unique offset corresponding to a specific cell among the I PRBs. Claim 61 was abandoned upon payment of a registration fee. The method of claim 55, wherein the first PRBs, Receiving apparatus having an index calculated through the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, and L _j is an index of the PRB to which the j-th DVRB is mapped. Claim 62 was abandoned upon payment of a registration fee. The method of claim 55, wherein the first PRBs, Receiving apparatus having an index calculated through the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, L _j is an index of PRB to which j-th DVRB is mapped, and m is a shift value of L. Claim 63 was abandoned upon payment of a registration fee. The method of claim 55, wherein the first PRBs, Receiving apparatus having an index calculated through the following equation.

Here, [x] represents a maximum integer not exceeding x, the offset is a unique value for each cell, and L _j is an index of the PRB to which the j-th DVRB is mapped. Claim 64 was abandoned upon payment of a registration fee. And a transceiver for estimating channel quality information for each PRB and feeding it back to a transmitting device.

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