WO2007131413A1

WO2007131413A1 - An allocation method of time-frequency resources and the apparatus and wireless communication system thereof

Info

Publication number: WO2007131413A1
Application number: PCT/CN2007/001308
Authority: WO
Inventors: Bingyu Qu; Xiaoan Fan
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-04-28
Filing date: 2007-04-20
Publication date: 2007-11-22
Also published as: CN101421947A; CN101064706A

Abstract

An allocation method of time-frequency resources and the apparatus thereof. The said method includes: dividing the whole time-frequency plane into R physical resource blocks with equal size, each PRB includes M sub-carriers continuous in the frequency domain and N symbols continuous in time domain(S11); setting a group of orthogonal time-frequency patterns for a cell(S12); allocating the PRB to the localized virtual resource block and/or the distributed virtual resource block, meanwhile, allocating the time-frequency pattern or its segment which is distributed in the distributed transmitting physical resource blocks to a distributed virtual resource block(S13). The apparatus includes the physical resource division unit, the time-frequency pattern setting unit and the time-frequency resource allocation unit. According to the invention, the interference to the cell should be randomized by the manner of utilizing the distributed transmitting time-frequency resources, and the sufficient frequency diversity gain could be achieved.

Description

Time-frequency resource allocation method, device thereof and wireless communication system

This application claims the priority of the Chinese patent application filed on April 28, 2006, the Chinese Patent Office, Application No. 200610077596.0, entitled "Time-Frequency Resource Allocation Method and Its Device and Wireless Communication System," It is incorporated herein by reference.

The present invention relates to the field of communications technologies, and in particular, to a method and apparatus for time-frequency resource allocation, and a wireless communication system. Background technique

Cellular wireless communication systems achieve frequency reuse by dividing a large service area into many smaller coverage areas to increase system capacity. Each small coverage area is called a cell. When a simple resource with a multiplexing factor of one is allocated, different cells use the same frequency, and signals of cells operating at the same frequency interfere with each other. Cellular system design requirements ensure that interference between users within the cell is as small as possible, while inter-cell interference is as even as possible.

Orthogonal Frequency Division Multiplexing (OFDM) technology divides a wideband channel into a number of orthogonal narrowband subchannels in the frequency domain, and high speed data streams are transmitted in parallel on each subchannel by serial-to-parallel conversion. Due to the narrowband characteristics of the subchannels, the multipath effects can be overcome, the intersymbol interference is greatly eliminated, and the orthogonality is satisfied due to the overlapping of the subchannels, so that the cross improves the spectrum utilization. At the same time, due to the development of digital signal processing and the introduction of fast discrete Fourier transform, the signal modulation and demodulation of OFDM systems have become very simple, which makes OFDM technology gradually become the core technology of mobile communication systems.

In the prior art, the following solutions are proposed for downlink data multiplexing:

The entire frequency band is divided into a series of physical resource blocks (PRBs), and each physical resource block includes consecutive subcarriers in M frequency domains and consecutive symbols in N time domains, and M is initially determined to be 25. Without considering information such as pilot and control, N takes the value 7, which is the number of symbols in one subframe. The size of a physical resource block is represented by ,, that is, the total number of time-frequency units occupied by physical resource blocks, and one time-frequency unit refers to one sub-carrier within one symbol time.

The OFDM system supports two transmission modes: Localized Distribution and Distributed Transmission. Centralized transmission occupies consecutive subcarriers, and is dispersed Transmission takes up some scattered subcarriers for frequency diversity purposes. For the convenience of description, the concept of virtual resource block (VRB) is introduced. A virtual resource block is represented by two parameters, the first one is the resource block size (Size); the second is the type (Type), that is, the virtual resource block is divided into a centralized virtual resource block (LVRB, Localized Virtual Resource Block) and There are two types of distributed virtual resource blocks (DVRBs).

The centralized virtual resource blocks (LVRBs) are mapped to physical resource blocks in a centralized manner, and the decentralized virtual resource blocks (DVRBs) are mapped to physical resource blocks in a decentralized manner. When there are two kinds of transmissions in one subframe, the two transmissions are multiplexed in a frequency division manner.

The scheme of mapping virtual resource blocks to physical resource blocks is an important part of the design of cellular wireless communication systems of OFDM technology. Currently, an implementation scheme is:

The set virtual resource block (LVRB) is equal in size to the physical resource block (PRB), and a centralized virtual resource block is directly mapped to a physical resource block.

The number of PRBs is represented by ^1⁄25, and the number of LVRBs is represented by N _ras . Since the mapping of LVRB to PRB is corresponding, the value of N _ras is equal to the number of PRBs used for centralized transmission. The remaining PRBs can be used for distributed transmission, expressed in DPRB, and the number is N = N

The distributed virtual resource block (DVRB) is equal in size to the LVRB and the PRB, and the number is represented by MN _≤ N _DPRB , that is, the resource finally allocated to the distributed transmission user is less than or equal to the number of resources that the system can distribute to the distributed transmission.

Each DVRB is divided into N-secrets, each of which is mapped to a section of a DPRB resource, which is continuous in both the frequency domain and the time domain. The specific segmentation and mapping methods are as follows:

Give ^ layer a 0 1^ set sequence number = 0,1 -1

Give N at the same time. Layer DPRB setting number j = 0, l, 2, , N诵 - 1

Split a DVRB into N. The first part is mapped to the _7th DPRB. Then the 7th share size of the first DVRB is given by the following formula: When _/

When ≠ , s _u = ^DVRB

DPRB

Which just indicates the size of a DVRB The DVRB with a smaller serial number is preferentially mapped.

Calculate the first part of the first DVRB; the starting position of the part on the first DPRB, the size of the first part of the 0th to the 1st DVRB needs to be accumulated.

The following illustrates the mapping of DVRB to DPRB in the prior art solution:

A 5M bandwidth system has 12 PRBs in a single subframe, 8 of which are used for centralized transmission, so Λ^TM=4. There are 3 DVRBs to be mapped into the physical channel.

Regardless of the information such as pilot and control, S _w ^ = S^=MxN= ²⁵ >< ⁷ =l ⁷⁵ . and so

175

When _/ =埘, 3⁄4. = 175 - (4-1) 46 175

When _/·≠ /, S . = : 43,

4

Where ,· = 0,1,3⁄4_/ = 0,1,2,3, so the DVRB of =0 occupies 0, the 1st, 2nd, 3rd, 4th, 5th subcarriers of the DPRB All 7 symbols, and the first 4 symbols of the 6th subcarrier; all 7 of the 0th, 1st, 2nd, 3rd, 4th, 5th subcarriers of the DPRB of the production 1, 2, 3 Symbol, and the first symbol of the sixth subcarrier;

The last 3 symbols of the 6th subcarrier of the DPRB, all 7 symbols of the 7th, 8th, 9th, 10th, and 11th subcarriers, and the first 5 symbols of the 12th subcarrier; occupy j'= The last 6 symbols of the 6th subcarrier of the DPRB, all 7 symbols of the 7th, 8th, 9th, 10th, and 11th subcarriers, and the first 5 symbols of the 12th subcarrier; The last 6 symbols of the 6th subcarrier of the DPRB of the household 3, all 7 symbols of the 7th, 8th, 9th, 10th, and 11th subcarriers, and the first 2 symbols of the 12th subcarrier;

The DVRB of =2 occupies the last 2 symbols of the 12th subcarrier of the DPRB with j'=0, all 7 symbols of the 13th, 14th, 15th, 16th, and 17th subcarriers, and the 18th subcarrier The first 6 symbols; the last 5 symbols of the 12th subcarrier of the occupied DPRB, all 7 symbols of the 13th, 14th, 15th, 16th, and 17th subcarriers, and the first 6 of the 18th subcarrier The last 5 symbols of the 12th subcarrier of the DPRB occupying _/=3, all 7 symbols of the 13th, 14th, 15th, 16th, and 17th subcarriers, and the front of the 18th subcarrier 3 symbols.

As shown in Figure 1, the three maps on the left correspond to three DVRBs, and the four graphs in the middle correspond to four DPRBs. Wherein, the occupied resources, the right slash represents the resources occupied by the DVRB of =1,

The occupied resources; the right picture corresponds to 12 PRBs, and the gray part indicates the PRB occupied by the centralized transmission.

It can be known from the technical solution disclosed above that the time-frequency resource occupation method of the distributed transmission cannot simultaneously strengthen the inter-cell interference randomization; and because a part of the DVRB is mapped to a DPRB, the occupied frequency resources are continuous, and one PRB in the system occupies When the bandwidth is large, such as 25 subcarriers, the continuous frequency resource cannot represent the channel condition experienced by 25 subcarriers, so the frequency diversity gain is limited; and when a PRB occupies a small bandwidth, such as 12 subcarriers. A DVRB may occupy only the same number of symbols on each PRB, losing time diversity gain. Summary of the invention

Embodiments of the present invention provide a method for allocating time-frequency resources, a device thereof, and a wireless communication system, which utilize randomized time-frequency resource occupation mode to achieve randomization of inter-cell interference and obtain sufficient frequency diversity gain and time diversity gain. .

An embodiment of the present invention provides a method for allocating a time-frequency resource, including:

The entire time-frequency plane is divided into R equal-sized physical resource blocks, and each physical resource block includes consecutive sub-carriers in the frequency domain and consecutive symbols in the time domain, where R, Μ, and Ν are positive Integer

Setting a set of orthogonal time-frequency patterns for the cell;

Allocating a physical resource block to a centralized virtual resource block or/and a distributed virtual resource block, wherein a time-frequency pattern or a fragment of a time-frequency pattern distributed in the distributed transport physical resource block is allocated to a distributed virtual resource block, the distributed transmission A physical resource block refers to a physical resource block allocated to a distributed virtual resource block.

An embodiment of the present invention provides a time-frequency resource allocation apparatus, configured to determine a location of a resource of each virtual resource block in a physical resource block, to allocate a time-frequency resource, where the virtual resource block includes a centralized virtual resource block and is dispersed. Virtual resource block; the device includes:

a physical resource division unit, configured to divide the entire time-frequency plane into R equal-sized physical resource blocks, where each physical resource block includes consecutive sub-carriers in the frequency domain and consecutive symbols in the time domain, where R , Μ and Ν are positive integers;

a time-frequency pattern setting unit, connected to the physical resource dividing unit, configured to set each cell a set of orthogonal time-frequency patterns and used to fill the entire time-frequency plane;

The time-frequency resource allocation unit is respectively connected to the physical resource dividing unit and the time-frequency pattern setting unit, and is configured to allocate the physical resource block to the centralized virtual resource block or/and the distributed virtual resource block, wherein the time-frequency in the distributed transmission physical resource block A slice of a pattern or a time-frequency pattern is assigned to one scatter virtual resource block, and the scatter-transport physical resource block refers to a physical resource block allocated to a scatter virtual resource block.

An embodiment of the present invention provides a wireless communication system, where the system includes a base station and a mobile station that communicates with the base station, where the base station includes:

a time-frequency resource allocation device, configured to determine a location of a resource of each virtual resource block in a physical resource block, where a location of the distributed virtual resource block in the physical resource block is allocated according to a time-frequency pattern;

The base station is configured to notify the mobile station of time-frequency resource information of the location of the resource of each virtual resource block in the physical source block;

The mobile station adjusts the time-frequency location for receiving the information according to the received time-frequency resource information of the resource of each virtual resource block in the physical source block.

In the technical solution provided by the embodiment of the present invention, the entire time-frequency plane is divided into several equal-sized physical resource blocks, and each physical resource block includes M sub-carriers in the frequency domain and N consecutive symbols in the time domain. , wherein R, M, and N are both positive integers; fill the entire time-frequency plane with a set of orthogonal time-frequency patterns specific to the cell; allocate physical resource blocks to the centralized virtual resource blocks and/or the distributed virtual resource blocks; Fragments of a time-frequency pattern or a time-frequency pattern distributed in a distributed transmission physical resource block are allocated to one distributed virtual resource block, and the distributed transmission physical resource block refers to a physical resource block allocated to the distributed virtual resource block. By designing the mapping relationship between virtual resource blocks and physical resource blocks, the time-frequency resource multiplexing of the frequency division orthogonal multiplexing (OFDM) cellular radio communication system is realized, so that the system only has distributed transmission, distributed transmission and centralized transmission. Frequency division multiplexing can meet the average possible requirement of inter-cell interference, and at the same time, sufficient frequency diversity gain can be obtained by distributed transmission. DRAWINGS

1 is a schematic diagram of a schematic diagram of mapping a distributed virtual resource block to a physical resource block in the prior art; FIG. 2 is a flowchart of a method for allocating time-frequency resources according to an embodiment of the present invention; 3 is a schematic diagram showing a distribution of a time-frequency pattern in a physical resource block in the embodiment shown in FIG. 2;

4 is a schematic diagram of mapping a distributed virtual resource block to a physical resource block by a time-frequency pattern in an embodiment provided in an embodiment of the present invention;

5 is a schematic structural diagram of a time-frequency resource allocation apparatus according to an embodiment of the present invention; and FIG. 6 is a schematic structural diagram of a wireless communication system provided in an embodiment of the present invention. detailed description

In order to facilitate the understanding of the principles, features and advantages of the present invention, the invention will be further described with reference to the accompanying drawings.

FIG. 2 is a flowchart of a method for allocating time-frequency resources according to an embodiment of the present invention. The time-frequency resource allocation method includes:

Step S11: Divide the entire time-frequency plane into R equal-sized physical resource blocks, where each physical resource block includes M sub-carriers in the frequency domain and N consecutive symbols in the time domain, where R, M, and N Are positive integers;

Step S12: Set a set of orthogonal time-frequency patterns for each cell, and fill the entire time-frequency plane with the same;

Step S13: Allocating a physical resource block to a centralized virtual resource block or/and a distributed virtual resource block, wherein a time-frequency pattern or a fragment of a time-frequency pattern distributed in the distributed transmission physical resource block is allocated to a distributed virtual resource block. The distributed transport physical resource block refers to a physical resource block allocated to a distributed virtual resource block.

For the purpose of the description, information such as pilot and control is not considered in the following description, and only the design of the entire time-frequency plane for data transmission is considered. Once the system needs to set information such as pilot and control, the corresponding position, such as the first or first two symbols of a sub-frame, is used for the pilot and other information, and the design of the remaining positions remains unchanged.

In step S11, the entire time-frequency plane is divided into R equal-sized physical resource blocks from the frequency domain, and each physical resource block includes M sub-carriers in the frequency domain. The entire time-frequency plane includes consecutive symbols in N time domains. Use ΜχΝ to indicate the size of a physical resource block, that is, the number of time-frequency resources included in one physical resource block. And set the sequence number of the R physical resource blocks to 0, 1, 2, ..., R- lo In step S12, a set of orthogonal time-frequency patterns is set for the cell and used to fill the entire time-frequency plane. Wherein, one time-frequency pattern refers to a set of time-frequency resources; two time-frequency patterns orthogonally mean that two time-frequency patterns do not include a common time-frequency resource.

For convenience of description, the case where the size of each time-frequency pattern is kxRxN (the time-frequency pattern size, that is, the number of time-frequency units occupied by one time-frequency pattern) will be described as an example. In this case, the entire time-frequency plane has M/k orthogonal time-frequency patterns, where k is any divisor of M, and the sequence number is set to the time-frequency pattern, ), l, 2, ..., M/ Kl.

Divide a time-frequency pattern into R sub-time-frequency patterns of equal size, and set the number 0, 1, 2, ..., R-1, first. The sub-time-frequency pattern contains only the time-frequency resources on the first physical resource block, J _q =0, 1, 2, ..., R-1. Each sub-time-frequency pattern has a size of kxN and contains N sets of resources on the corresponding physical resource block. The N sets of resources are respectively located on N different symbols, and each of the symbols occupies k subcarriers, and the k subcarriers may be continuous or discontinuous, for example, may be equally spaced.

In fact, the time-frequency pattern design can be carried out according to the description of the schemes described in the various patents, such as the patent application number: 200610005696.2, 200610006600.4 or / and 200610002999.9. A time-frequency pattern is represented by one or more sequences {S ')}, and its specific meanings are mainly as follows: 1. s (o represents the s (o) of the first time unit in a certain physical resource block a frequency unit, where one time unit is one symbol or multiple adjacent symbols, one frequency unit is one subcarrier or multiple adjacent subcarriers; and two, s( ) represents a certain physical resource block, on the first frequency unit The s 'th time unit; s( ) represents the S 'th frequency unit in the first physical resource block within a certain time unit. When the time-frequency pattern groups of different cells are respectively generated by different sequence groups, and there is a good correlation between the sequence groups, interference randomization can be obtained between the time-frequency patterns. The specific sequence design process is described in detail in the patent, and will not be described here.

The following is an example in which the case where the time-frequency pattern size is kxRxN is taken as an example. Each sub-time-frequency pattern of each time-frequency pattern is assigned a specific sequence of length N, the sequence number of which corresponds to N symbols, and the value of the sequence corresponds to a sub-carrier position in one physical resource block. As shown in FIG. 3, an embodiment of a case where a time-frequency pattern is distributed in a physical resource block. Among them, the parameters M=25, N=7, R=12, k=5. The left diagram in Fig. 2 shows a time-frequency pattern and its 12 sub-time-frequency patterns, in which different patterns represent different sub-time-frequency patterns in the time-frequency pattern; the right picture shows 12 physical resource blocks, in which different patterns Corresponding to the sub-time-frequency pattern of the corresponding pattern, the blank portion is Other time-frequency patterns,

The time-frequency pattern fills up. Different cells can use the same time-frequency pattern group or different time-frequency pattern groups. When different time-frequency pattern groups designed in the above patents are used, randomization of interference between cells can be conveniently obtained.

In step S13, the physical resource block is allocated to the centralized virtual resource block or/and the distributed virtual resource block, wherein the time-frequency pattern or the fragment of the time-frequency pattern distributed in the distributed transmission physical resource block is allocated to one distributed virtual resource block. The distributed transport physical resource block refers to a physical resource block allocated to a distributed virtual resource block. A feasible approach, but not limited to this, is to sequentially allocate the portions of the time-frequency pattern that are not occupied by the centralized transmission to the distributed transmission virtual resource blocks. Specifically, when a segment of a time-frequency pattern is used as the last time-frequency pattern segment assigned to a virtual resource block, the next segment of the time-frequency pattern is allocated as the first time-frequency pattern segment of the next virtual resource block. .

In a specific implementation process, each of the distributed virtual resource blocks may be sequentially allocated a sub-time-frequency pattern that is not occupied by the centralized transmission, that is, all the sub-time-frequency patterns that can be allocated to the distributed virtual resource blocks are uniformly numbered, and the sub-times are distributed in a small number. The resource block preferentially assigns a sub-time-frequency pattern with a small serial number.

At a certain time, the number of centralized virtual resource blocks in the system is the number of distributed virtual resource blocks. Given the virtual resource block size, for example MxN, the corpse + g R. Give the scattered virtual resource block numbers, =0, l, 2, ..., P-l.

When only dispersion transmission, i.e., when β = 0, for all the sub unified pilot pattern number, for example of the pattern of the original time-frequency i _0. The uniform number of the sub-time-frequency patterns is z = i _Q R + j ₀ , where ₀ =0,1,2, .. " ^-l , j ₀ =0,1,2,..., Rl , Ζ = 0,1,2,· · · ·,

RM / k - l . Then sequentially assign the sub-time-frequency pattern to the virtual resource block according to the serial number, giving the serial number

The scattered virtual resource blocks of the Ί are preferentially assigned a sub-time-frequency pattern with a small serial number.

When there are both centralized transmission and distributed transmission, that is, when there are β physical resource blocks for centralized transmission, R-g sub-time-frequency patterns in each time-frequency pattern can be allocated to the distributed virtual resource blocks. Give these time-frequency patterns that can be assigned to the distributed transmission a uniform number, z =0,1,2,..., (R - Q)M /k - \ , and then sequentially assign the sub-time-frequency patterns to the sequence numbers. The virtual resource block preferentially assigns a sub-time-frequency pattern with a small serial number to the scattered virtual resource blocks with small serial numbers.

According to the above method, the position of each sub-time-frequency pattern of each time-frequency pattern in the physical resource block can be according to the application number: 200610005696.2, 200610006600.4 or I and The method provided by the patent of 200610002999.9 is determined, and the specific determination process is detailed in the above-mentioned patents, and details are not described herein again. These methods ensure that there is little interference between any two time-frequency patterns or time-frequency pattern segments from different cells. When the centralized transmission occupies a part of the physical resource block, the design of the time-frequency pattern remains unchanged, and the virtual resource block will be divided into a part of the time-frequency pattern of the time-frequency pattern, that is, the fragment of the time-frequency pattern, which ensures the original The interference randomization is still valid.

Another purpose of the time-frequency pattern design is to obtain frequency diversity gain and time diversity gain by rearranging the order of the time-frequency lattice points. Compared with the prior art, when the user occupies resources in units of time-frequency patterns or time-frequency pattern segments, it can be mapped to discontinuous frequency bands and different symbols, and the frequency diversity gain and the time diversity gain are sufficiently obtained.

The time-frequency pattern of each cell is pre-designed and well known to base stations and users. Therefore, for the distributed transmission users, only need to know which sub-time-frequency patterns are included in each of the distributed virtual resource blocks, and then the mapping relationship between each virtual resource block and the physical resource block can be known, so as to know that each virtual resource block actually occupies The case of frequency resources.

The following illustrates the mapping method of the scheme from the distributed virtual resource block to the physical resource block.

In a 5M bandwidth system, there are 12 physical resource blocks in one subframe, 8 of which are used for centralized transmission, and 3 of the distributed virtual resource blocks are mapped to the physical channel. Still take M=25, N=7.

According to the above conditions, R = 12, = 3, Q = 8 „ along the position of the physical resource block occupied by the centralized transmission in the example of the prior art, and j = 0 , 1 , 3 , 4 , 6 , 7 , 9 are obtained. The physical resource block of 10 is occupied by the centralized transmission.

The case where 1 is taken here is taken as an example for explanation. Since there are 8 physical resource blocks occupied by the centralized transmission, there are only 4 sub-time-frequency patterns in each time-frequency pattern, that is, the sub-time-frequency patterns of = 2, 5, 8, and 11 are allocated to the distributed virtual resource blocks, which are common. 4x25 = 100 such sub-time-frequency patterns. Then, sequentially, 4 bar per 25 sub-time-frequency patterns are assigned to one virtual resource block. which is:

The scattered virtual resource blocks of p=0 occupy the sub-time-frequency patterns of _/= 2, 5, 8, and 11 in the time-frequency patterns of 0, 1, 2, 3, 4, and 5,

a sub-time-frequency pattern of =2 in the time-frequency pattern;

The decentralized virtual resource block of p=l occupies a sub-time-frequency pattern of 7=5, 8, 11 in the time-frequency pattern of 6,

Child time-frequency pattern, and time-frequency pattern of =12 =2,5 sub-time-frequency pattern;

The sub-time-frequency pattern of 8,11 in the time-frequency pattern, the sub-time-frequency pattern of 2,5,8,11 in the time-frequency pattern of ζ·=13,14,15,16,17,

Medium-frequency 2,5,8 sub-time-frequency pattern.

As shown in FIG. 4, the time-frequency resource occupation of the distributed virtual resource block of 7=0, the example in the figure adopts a special time-frequency pattern, that is, each sub-time-frequency pattern is on a different symbol in the physical resource block. The occupied subcarriers are in the same pattern. The left graph in Figure 3 represents the scattered virtual resource blocks of /? = 0, the middle seven graphs represent the seven time-frequency patterns assigned to the virtual resource blocks, and the right graph shows three of the twelve physical resource blocks. Physical resource blocks; the parts with various patterns in the figure represent the use of distributed virtual resource blocks allocated to =0, the gray part indicates the use allocated to the centralized transmission, and the white part indicates the allocation to other distributed virtual resource blocks or not allocated. . The Arabic numerals on the right side of the decentralized virtual resource block and the physical resource block represent subcarrier numbers 0-24, and the Arab numerals on the right side of the time-frequency pattern represent sub-time-frequency pattern numbers 0-11.

In addition, in the embodiment of the present invention, a time-frequency resource allocation device is further provided, and a schematic structural diagram of the device is shown in FIG. 5. The device is configured to determine a location of a resource of each virtual resource block in a physical resource block to allocate a time-frequency resource, where the virtual resource block includes a centralized virtual resource block and a distributed virtual resource block, where the device includes:

The physical resource dividing unit 51, the time-frequency pattern setting unit 52, and the time-frequency resource allocating unit 53. The physical resource dividing unit 51 is configured to divide the entire time-frequency plane into R equal-sized physical resource blocks, where each physical resource block includes consecutive sub-carriers in the frequency domain and consecutive time domains. The symbol of R, Μ, and Ν is a positive integer; the time-frequency pattern setting unit 52 is connected to the physical resource dividing unit 51, and is configured to set a set of orthogonal time-frequency patterns for each cell, and fill in the same Full time-frequency plane;

In a specific embodiment, a time-frequency pattern setting unit sets a set of equal-sized and orthogonal time-frequency patterns for each cell, and determines a size of each time-frequency pattern as: kxRxN; the number of the time-frequency patterns For example, M/k, k is any divisor of M; the function of the time-frequency pattern setting unit is further: a time-frequency pattern can be formed by setting R equal-sized sub-time-frequency patterns, the R sub-time-frequency The time-frequency resources occupied by the patterns are respectively located in R different physical resource blocks, and each sub-time-frequency pattern occupies k sub-carriers on each symbol. Time-frequency resource allocation unit And the physical resource dividing unit 51 and the time-frequency pattern setting unit 52 are respectively connected to allocate the physical resource block to the centralized virtual resource block or/and the distributed virtual resource block, where the distributed resource block is distributed in the physical resource block. A fragment of a frequency pattern or a time-frequency pattern is allocated to a decentralized virtual resource block, which refers to a physical resource block allocated to a decentralized virtual resource block. The specific function of assigning the time-frequency pattern to the scatter virtual resource block may be: configured to allocate a sub-time-frequency pattern in the time-frequency pattern to the scatter virtual resource block, where the time-frequency resource occupied by the sub-time-frequency pattern is located in the allocation In the physical resource block for distributed transmission;

More specifically, the time-frequency pattern and the sequence number of the distributed virtual resource block are separately set, and the portions of the time-frequency pattern that are not occupied by the centralized transmission are sequentially allocated to the distributed virtual resource block by the serial number, and when a time-frequency pattern is used When a segment is assigned to the last time-frequency pattern segment of a virtual resource block, the next segment of the time-frequency pattern is allocated as the first time-frequency pattern segment of the next virtual resource block; the sub-time-frequency pattern can also be utilized The division simplification operation, that is, the function of the resource allocation unit may be more specifically described as: respectively setting the sequence numbers of the distributed virtual resource blocks and the sub-time-frequency patterns, wherein the sub-time-frequency patterns are located in the physical resource blocks allocated to the distributed transmission, And the sub-time-frequency patterns are sequentially allocated to the distributed virtual resource blocks by serial number.

For the implementation of the functions of the above-mentioned devices, refer to the specific implementation process of the foregoing method, and details are not described herein again.

In addition, an embodiment of the present invention further provides a wireless communication system, and a schematic structural diagram of the system is shown in FIG. 6. The system includes a base station 61 and a mobile station 62 that communicates with a base station, where the base station includes time-frequency resource allocation means 611 for determining a location of a resource of each virtual resource block in a physical resource block, wherein the virtual resource block is dispersed The location in the physical resource block is allocated according to the time-frequency pattern; and the base station is configured to notify the mobile station of time-frequency resource information of the location of the resource of each virtual resource block in the physical source block;

The mobile station 62 adjusts a time-frequency location for receiving information according to the received time-frequency resource information of the resource of each virtual resource block in the physical source block.

The time-frequency resource allocation device 611 includes: a physical resource dividing unit 6111, a time-frequency pattern setting unit 6112, and a time-frequency resource allocating unit 6113, wherein functions and functions of the respective units are the same as those of the unit in FIG. For details, refer to the above, and details are not described herein again.

The above description is only a preferred embodiment of the present invention, it should be noted that It will be apparent to those skilled in the art that modifications and modifications may be made without departing from the principles of the invention.

Claims

Rights request

A method for allocating time-frequency resources, characterized in that:

Divide the entire time-frequency plane into R equal-sized physical resource blocks, each of which is a positive integer;

Setting a set of orthogonal time-frequency patterns for the cell;

The allocation method according to claim 1, wherein the set of orthogonal time-frequency patterns is set for each cell, and the specifications of each time-frequency pattern are: kxRxN; The number is: M/k, where k is any divisor of M.

The allocation method according to claim 2, wherein R equal-sized sub-time-frequency patterns are configured to form a time-frequency pattern, and the time-frequency resources occupied by the R sub-time-frequency patterns are respectively located in R different In the physical resource block.

The allocation method according to claim 3, wherein the sub-time-frequency pattern occupies k subcarriers on one symbol.

The allocation method according to claim 1, wherein the time-frequency patterns set for different cells are the same or different.

The allocation method according to claim 1, wherein the allocating the physical resource block to the centralized virtual resource block or/and the distributed virtual resource block specifically includes:

All physical resource blocks are allocated to the centralized virtual resource blocks or all are allocated to the distributed virtual resource blocks, or

A part of the physical resource blocks are allocated to the centralized virtual resource blocks, and the remaining physical resource blocks are allocated to the distributed virtual resource blocks.

The allocation method according to claim 3 or 4, wherein the sub-time-frequency pattern in the time-frequency pattern is allocated to the distributed virtual resource block, wherein the time-frequency resource occupied by the sub-time-frequency pattern is allocated to Distributed in the physical resource block of the transmission.

8. The method according to claim 1, wherein the specific process of assigning the time-frequency pattern or the fragment of the time-frequency pattern to the distributed virtual resource block comprises:

The segments of the time-frequency pattern and/or the time-frequency pattern and the scattered virtual resource blocks are respectively sorted, and the time-frequency patterns or the segments of the time-frequency pattern that are not occupied by the centralized transmission are sequentially allocated to the distributed virtual resource blocks.

The allocation method according to claim 8, wherein the specific process of allocating the time-frequency pattern or the fragment of the time-frequency pattern to the distributed virtual resource block comprises:

The scattered virtual resource blocks and the sub-time-frequency patterns are respectively sorted, wherein the sub-time-frequency patterns are located in physical resource blocks allocated to the distributed transmission; and the sub-time-frequency patterns are sequentially allocated to the distributed virtual resource blocks.

10. The method according to claim 1, wherein the method further comprises: assigning one or more virtual resource blocks to one channel or one user.

A time-frequency resource allocation apparatus, configured to determine a location of a resource of each virtual resource block in a physical resource block, to allocate a time-frequency resource, where the virtual resource block includes a centralized virtual resource block and a distributed virtual resource block ; characterized in that the device comprises:

a physical resource division unit is configured to divide the entire time-frequency plane into R equal-sized physical resource blocks, where each physical resource block includes M sub-carriers in a frequency domain and N consecutive symbols in a time domain, where R , M and N are positive integers;

a time-frequency pattern setting unit, connected to the physical resource dividing unit, configured to set a set of orthogonal time-frequency patterns for each cell, and fill the entire time-frequency plane with the same;

The time-frequency resource allocation apparatus according to claim 11, wherein the time-frequency pattern setting unit sets the specification of each time-frequency pattern in a set of orthogonal time-frequency patterns set for each cell as: kxRxN The number of the time-frequency patterns is: M/k, where k is any divisor of M.

13. The time-frequency resource allocation apparatus according to claim 12, wherein: said time frequency The set of time-frequency patterns set by the pattern setting unit includes R equal-sized time-frequency patterns, and the time-frequency resources occupied by the R sub-time-frequency patterns are respectively located in R different physical resource blocks, and each sub-time-frequency pattern Occupies k subcarriers on each symbol.

The time-frequency resource allocation unit according to any one of claims 11 to 13, wherein the time-frequency resource allocation unit allocates a sub-time-frequency pattern in a time-frequency pattern to a distributed virtual resource block, wherein The time-frequency resources occupied by the sub-time-frequency patterns are located in physical resource blocks allocated to the distributed transmission.

The time-frequency resource allocation unit according to claim 11, wherein the time-frequency resource allocation unit allocates a time-frequency pattern to the distributed virtual resource block, specifically for respectively sorting the time-frequency pattern and the distributed virtual resource block. And the segments of the time-frequency pattern or the time-frequency pattern that are not occupied by the centralized transmission are sequentially allocated to the distributed virtual resource blocks.

The time-frequency resource allocation unit according to claim 15, wherein the time-frequency resource allocation unit allocates a time-frequency pattern to the distributed virtual resource block, and sequentially sorts the distributed virtual resource block and the sub-time-frequency pattern, wherein The sub-time-frequency pattern is located in a physical resource block allocated to the distributed transmission; and the sub-time-frequency patterns are sequentially allocated to the distributed virtual resource blocks.

17. A wireless communication system, the system comprising a base station and a mobile station in communication with the base station, wherein the base station comprises:

The mobile station adjusts a time-frequency location for receiving information according to the received time-frequency resource information of the resource of each virtual resource block in the physical source block.

The wireless communication system according to claim 17, wherein the time-frequency resource allocation device comprises:

a physical resource division unit, configured to divide the time-frequency plane into R equal-sized physical resource blocks, where each physical resource block includes M sub-carriers in the frequency domain and N consecutive symbols in the time domain, where R, M and N are both positive integers; The time-frequency pattern setting unit is connected to the physical resource dividing unit, and sets a set of orthogonal time-frequency patterns for each cell according to the time-frequency resource, and fills the entire time-frequency plane with the same;

The time-frequency resource allocation unit is respectively connected to the physical resource dividing unit and the time-frequency pattern setting unit, and allocates the physical resource block to the centralized virtual resource block or/and the distributed virtual resource block, wherein the time-frequency pattern in the distributed transmission physical resource block Or a fragment of the time-frequency pattern is assigned to a scatter virtual resource block, and the scatter-transport physical resource block refers to a physical resource block allocated to the scatter virtual resource block.