CN101742666B - Multi-carrier-based method for mapping resource - Google Patents

Abstract

The present invention discloses a frequency resource mapping method. In one of the mapping methods, the available subcarriers are divided into n physical resource units, and the first permutation operation is performed on the n physical resource units, wherein the first permutation operation is based on n1 A physical resource unit is used as a unit; the n physical resource units after the first permutation operation are mapped to multiple frequency partitions according to the frequency partition configuration information; in each frequency partition, a second permutation operation is performed on some or all of the physical resource units, where , the second replacement operation takes n2 physical resource units as a unit; the physical resource units after the second replacement operation are mapped to logical resource units; wherein, n, n1, and n2 are all integers greater than or equal to 1, and n is greater than or Equal to n1, n2. Through the present invention, the spectrum efficiency of the wireless communication system based on the multi-carrier technology can be ensured.

Description

Resource mapping method based on multi-carrier

technical field

The present invention relates to the field of wireless communication, in particular to a multi-carrier-based resource mapping method.

Background technique

In a wireless communication system, a base station refers to a device that provides services for a terminal, and communicates with the terminal through an uplink/downlink, wherein the downlink refers to the direction from the base station to the terminal, and the uplink refers to the direction from the terminal to the base station. As far as data transmission is concerned, multiple terminals can simultaneously send data to the base station through the uplink, and can also receive data from the base station through the downlink at the same time. In a wireless communication system that uses a base station to implement wireless resource scheduling control, the scheduling and allocation of system wireless resources is completed by the base station. For example, the base station provides downlink resource allocation information when the base station performs downlink transmission, uplink resource allocation information when the terminal performs uplink transmission, and the like. Resource allocation information includes information such as actual physical resource locations and transmission methods. Communication systems based on different technologies have different requirements and methods for resource allocation and resource mapping.

For wireless communication systems based on Time Division Multiple Address (TDMA) technology, such as the Global System for Mobile communication (GSM) system, which belongs to the single-carrier system, when the base station schedules wireless resources Usually, the wireless resources are divided into consecutive wireless frames in the time domain, where each wireless frame contains 8 time slots for data and signaling transmission between the base station and the terminal. The resource mapping and the resource allocation process based on resource mapping are relatively Simple; for a wireless communication system based on code division multiple access (Code Division Multiple Address, CDMA) technology, which uses CDMA codes to distinguish channels and terminals, resource mapping and resource allocation based on resource mapping are relatively simple. In the third-generation wireless communication system with dual technologies of CDMA and CDMA, for example, in a Time-Division Synchronous Code Division Multiple Address (TD-SCDMA) system, the base station also divides the wireless resources of the air interface into A radio frame with a period of 10ms, each 10ms contains 14 regular time slots and 6 special time slots, where the regular time slots are used to transmit specific services and signaling, and in each regular time slot, the base station passes different The codewords are used to distinguish users, and the resource mapping process is not complicated.

The main reason is that the above-mentioned system is not based on Orthogonal Frequency Division Multiple Address (OFDMA) technology, OFDMA is a multi-carrier system, and the interference control strategies of TDMA and CDMA systems are relatively simple, for example, It uses frequency reuse technology to achieve large-area coverage through the multiplexing of multiple frequency points, while the interference control technology of the OFDMA system is relatively flexible and complex, and Fractional Frequency Reuse (FFR for short) technology can be used. In addition, in order to ensure the spectral efficiency of limited resources, the base station needs to support technical features such as multi-carrier operation, multi-resource types, and multi-resource granularity, which puts new constraints and requirements on the resource mapping process of OFDMA-based wireless communication systems.

Therefore, the resource mapping process of wireless communication systems based on TDMA and CDMA technology, which takes time slots or codewords as resource units, can no longer meet the needs of wireless communication systems based on OFDMA technology. In order to ensure the spectrum efficiency of OFDMA systems, it is necessary to design a A radio resource mapping mechanism suitable for OFDMA systems.

Contents of the invention

Considering that the resource mapping process of the wireless communication system based on TDMA and CDMA technology in the related art cannot meet the needs of the wireless communication system based on OFDMA technology, it is necessary to design a wireless resource mapping mechanism of the OFDMA system and propose the present invention, Therefore, the present invention aims to provide a resource mapping method to solve the above problems.

According to one aspect of the present invention, a resource mapping method is provided. In this method, the available subcarriers are divided into n physical resource units, and the first permutation operation is performed on the n physical resource units, wherein, the first permutation operation takes n1 physical resource units as a unit; after the first permutation operation The n physical resource units of are mapped to multiple frequency partitions according to the frequency partition configuration information; in each frequency partition, a second permutation operation is performed on some or all of the physical resource units, wherein the second permutation operation takes n2 physical resource units as Unit; mapping the physical resource unit after the second permutation operation to a logical resource unit; wherein, n, n1, and n2 are all integers greater than or equal to 1, and n is greater than or equal to n1, n2. Preferably, n1 is greater than n2.

Preferably, in each frequency partition, performing the second permutation operation on part or all of the physical resource units includes: for frequency partitions that need to reserve continuous physical resource units for the centralized resource group, removing the reserved continuous physical resource units in the frequency partition The second replacement operation is performed on the physical resource units outside the resource unit; for the frequency partition that does not need to reserve continuous physical resource units for the centralized resource group, the second replacement operation is performed on all the physical resource units in the frequency partition.

Preferably, mapping the physical resource units after the second permutation operation into logical resource units includes: in each frequency partition, dividing the physical resource units after the second permutation operation into centralized resource groups and/or according to frequency partition configuration information Distributed resource group: directly map physical resource units in the centralized resource group to logical centralized resource units, and/or perform a third permutation operation on data subcarriers in the distributed resource group to obtain logical distributed resource units. Wherein, the subcarriers in the logical centralized resource unit are continuous, and the subcarriers in the logical distributed resource unit are discontinuous or continuous in pairs or every 4 subcarriers are continuous.

Preferably, the first permutation operation, the second permutation operation, and the third permutation operation all adopt one or a combination of the following according to permutation lengths: row-column permutation, circle permutation mapping, uniform extraction permutation, specific sequence permutation and random permutation. Wherein, when the first replacement operation is uniform extraction and replacement, the replacement operation is performed by extracting physical resource units at equal intervals from n physical resource units in units of n1 physical resource units.

In addition, preferably, in the above method, for the available subcarriers, the physical resource units composed of guard subcarriers of adjacent carrier frequencies are directly mapped to the last frequency partition containing the centralized resource group according to the frequency partition configuration information. Centralized resource grouping.

Preferably, the above-mentioned frequency partition configuration information includes at least one of the following: the number of frequency partitions, the size of frequency partitions and/or the size of distributed resource groups in frequency partitions and/or the size of centralized resource groups, the The number of continuous physical resource units in the centralized resource group, wherein the continuous physical resource units are physical resource units belonging to the same replacement unit when the first replacement is performed.

According to another aspect of the present invention, another multi-carrier-based resource mapping method is provided. In this method, the available subcarriers are divided into n physical resource units, and the first permutation operation is performed on the n physical resource units, wherein the first permutation operation is based on n1 physical resource units; according to the frequency partition configuration information, The n physical resource units after the first replacement operation are divided into centralized resource groups and distributed resource groups; the physical resource units in the distributed resource group and/or part or all of the physical resources in the centralized resource group are subjected to the second Two permutation operations, wherein the second permutation operation takes n2 physical resource units as units; the n physical resource units after the second permutation operation are mapped to multiple frequency partitions, and the physical resource units in each frequency partition are mapped as Logical resource unit; wherein, n, n1, and n2 are all integers greater than or equal to 1, and n is greater than or equal to n1, n2. Preferably, n1 is greater than n2.

Wherein, for the available subcarriers, the physical resource units composed of guard subcarriers of adjacent carrier frequencies are mapped to logical centralized resource units in the last frequency partition containing the localized resource group according to the frequency partition configuration information.

Preferably, mapping the physical resource units after the second permutation operation to multiple frequency partitions includes: mapping the physical resource units in the localized resource group after the second permutation operation as a centralized resource unit in the frequency partition according to frequency partition configuration information. The physical resource units in the distributed resource group after the second permutation operation are mapped as the distributed resource units in the frequency partition.

Preferably, mapping the physical resource units in the frequency partition to logical resource units includes: directly mapping the centralized resource units in the frequency partition to logical centralized resource units, and/or mapping the distributed resource units in the frequency partition The third permutation operation is performed on the data subcarriers to obtain logical distributed resource units. Wherein, the subcarriers in the logical centralized resource unit are continuous, and the subcarriers in the logical distributed resource unit are discontinuous or continuous in pairs or every 4 subcarriers are continuous.

Preferably, the frequency partition configuration information includes at least one of the following: the number of frequency partitions, the size of frequency partitions and/or the size of distributed resource groups in frequency partitions and/or the size of centralized resource groups, the centralized The number of contiguous physical resource units in the resource group, wherein the contiguous physical resource units are physical resource units that belong to the same permutation unit when the first permutation is performed.

Through the technical solution of the present invention, by setting different units or granularities for resource scheduling, the problem that the current resource mapping process based on single carrier technology cannot meet the needs of OFDMA technology-based wireless communication systems is solved. Compared with the prior art, The spectrum efficiency of the wireless communication system based on the multi-carrier technology can be ensured.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:

FIG. 1 is a schematic diagram of a frame structure of a wireless communication system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a resource structure of a wireless communication system according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a frequency resource mapping process according to an embodiment of the present invention;

FIG. 4 is a flowchart of a frequency resource mapping process according to Embodiment 1 of the present invention;

FIG. 5 is a schematic diagram of a frequency resource mapping process according to Example 1 of the present invention;

FIG. 6 is a schematic diagram of a frequency resource mapping process according to Example 2 of the present invention;

FIG. 7 is a schematic diagram of a frequency resource mapping process according to Example 3 of the present invention;

FIG. 8 is a flowchart of a frequency resource mapping process according to Embodiment 2 of the present invention;

FIG. 9 is a schematic diagram of a frequency resource mapping process according to Example 4 of the present invention;

FIG. 10 is a schematic diagram of a frequency resource mapping process according to Example 5 of the present invention;

Fig. 11 is a schematic diagram of a frequency resource mapping process according to Example 6 of the present invention.

Detailed ways

Functional Overview

Before describing the embodiments of the present invention, a brief description of the resource mapping process of the OFDMA technology is given first. It should be noted that, although OFDMA technology is used as an example for illustration in the embodiment of the present invention, the present invention is not limited thereto. In multi-carrier systems such as Long Term Evolution (LTE for short) and future In other possible multi-carrier systems, the present invention can also be applied.

In a wireless communication system based on OFDMA technology, the resource mapping process can be understood as the process of mapping physical resources (such as physical subcarriers) into logical resources, for example, mapping physical subcarriers into logical resource blocks, so that the base station through the scheduling logic Resource blocks implement the scheduling of radio resources. The main basis for resource mapping is the frame structure and resource structure of the OFDMA system. In the frame structure, wireless resources are divided into units of different levels in the time domain for scheduling, for example, divided into super frame (Super frame), frame (Frame), subframe (Subframe) and symbol (Symbol). For example, as shown in Figure 1, wireless resources are divided into superframes in the time domain, each superframe contains 4 frames, and each frame contains 8 subframes, and the subframes are composed of 6 basic OFDM symbols. The actual system Determine how many OFDM symbols are specifically included in each level unit in the frame structure according to factors such as the speed, rate, and service type of the terminal to be supported.

In the frequency domain, the resource structure divides the available frequency band into multiple frequency partitions (Frequency Partition) according to factors such as the coverage to be supported, terminal speed, rate, and service type, and then divides the frequency resources in the frequency partition into centralized resource areas and / or distributed resource areas for scheduling. As shown in Figure 2, the available physical subcarriers of a subframe are divided into three frequency partitions to support three cells, and each frequency partition is divided into centralized resources and distributed resources to achieve scheduling flexibility, according to If necessary, it can also be divided into 2, 4, or 6 or more frequency partitions, which is not limited in the present invention.

In the following embodiments, n, n1 and n2 are all integers greater than or equal to 1, and n is greater than or equal to n1 and n2 unless otherwise specified. The frequency partition configuration information mentioned in the embodiments of the present invention includes at least one of the following: the number of frequency partitions, the size of the frequency partition (that is, the number of physical resource units included) and/or the number of distributed resource groups in the frequency partition The size and/or the size of the centralized resource group, the number of continuous physical resource units in the centralized resource group of the frequency partition, and it should be noted that the continuous physical resource units are the physical resource units that belong to the same replacement unit when the first replacement is performed. resource unit.

A distributed resource group refers to a resource group in which the physical resource unit is a distributed physical resource unit. The distributed physical resource unit is eventually replaced with a logical distributed resource unit (LDRU for short). The LDRU contains The subcarriers are discontinuous or continuous in pairs, and can also be continuous every 4 subcarriers; the centralized resource group refers to the resource group in which the physical resource unit is a centralized physical resource unit, and the centralized physical resource unit is finally It is directly mapped to a Logical Localized Resource Unit (LLRU for short), and the subcarriers contained in the LLRU are continuous.

In addition, the replacement operations mentioned in the embodiments of the present invention, for example, the first replacement operation, the second replacement operation, and the third replacement operation mentioned below, the replacement methods that can be used according to the replacement length include but are not limited to the following One or a combination of: row-column permutation, circular permutation map, uniform draw permutation, sequence-specific permutation, and random permutation. For example, suppose the original sequence is [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11] and the permutation length is 12. If row and column permutation is used, the permutation matrix is [0, 1 , 2, 3; 4, 5, 6, 7; 8, 9, 10, 11], then the sequence after replacement is [0, 4, 8, 1, 5, 9, 2, 6, 10, 3, 7 , 11], if a specific sequence is used for replacement, the replacement sequence [0, 6, 3, 10, 7, 4, 1, 11, 8, 2, 5, 9] is the sequence order after replacement. In principle, for some variants based on row and column replacement, it still belongs to row and column replacement, for example, the original sequence is [0, 1, 2, 3, 4], and the sequence after replacement is: 0, 3, 1, 4, 2, the essence is still It is the permutation of rows and columns, that is, the first 5 of [0, 1, 2; 3, 4, 5].

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

Embodiment one

In this embodiment, a resource mapping method is provided. Figure 4 shows a schematic diagram of the implementation process of this method. As shown in Figure 4, it can be roughly implemented through the following operations:

Step 402, perform a first permutation operation on the n physical resource units included in the available subcarriers in units of n1 physical resource units; taking the first permutation operation using uniform extraction permutation as an example, when performing the permutation operation, will be The n1 physical resource units are used as a unit to extract physical resource units from the n physical resource units at equal intervals.

Step 404: Map the n physical resource units after the first permutation operation to multiple frequency partitions according to the frequency partition configuration information, specifically, the frequency partition configuration information here is the number of frequency partitions and the physical resource units in the frequency partitions , where the number A of physical resource units in a frequency partition can be obtained directly from the configuration information of the frequency partition, or indirectly obtained from the size B of the distributed resource group and the size C of the centralized resource group, that is, A=B+ c.

Step 406, in each frequency partition, perform a second permutation operation on some or all of the physical resource units in units of n2 physical resource units; in this step, preferably, according to the frequency partition configuration information, for each frequency partition, respectively Determine whether continuous physical resource units need to be reserved for the centralized resource group, and for a frequency partition that needs to reserve continuous physical resource units, perform a second replacement operation on the physical resource units in the frequency partition except for the reserved continuous physical resource units ; For a frequency partition that does not need to reserve continuous physical resource units, perform a second permutation operation on all physical resource units in the frequency partition.

Step 408: Map the physical resource units after the second permutation operation in the frequency partition into logical resource units. In this process, it is necessary to determine the size of the centralized resource group and/or the size of the distributed resource group according to the frequency partition configuration information, and then divide the physical resource units in the frequency partition into centralized resource groups (or called centralized resource groups). region) and/or distributed resource group (or called distributed region) (operation 1), for the physical resource unit in the centralized resource group, it is directly mapped to the logical centralized resource unit, for the data in the distributed resource group Subcarriers perform a third permutation operation to obtain logical distributed resource units (operation 2). Preferably, the third replacement operation here may be circle replacement mapping, and details about the circle mapping replacement will be described below.

In the embodiment of the present invention, preferably, n1>n2, it can be ensured that all physical resource units are continuous when the replacement is performed in units of n1 physical resource units, and the subsequent replacement in units of n2 physical resource units There are no restrictions on substitution. Embodiments of the present invention are further described below in conjunction with application examples.

Example 1

In this example, the frequency partition configuration information is as follows: (1) divide the subframe into 3 frequency partitions, that is, the number of frequency partitions is 3, (2) frequency partition 1 includes a centralized resource group and a distributed resource group The centralized resource group and the distributed resource group respectively contain 4 physical resource units; frequency partition 2 includes a centralized resource group and a distributed resource group, wherein the centralized resource group contains 10 physical resource units, and the distributed The centralized resource group contains 2 physical resource units; the frequency partition 3 only includes a centralized resource group, and the centralized resource group contains 4 physical resource units; (3) the centralized resource groups in frequency partition 2 and frequency partition 3 are both It is required to contain 4 consecutive physical resource units.

FIG. 5 describes the resource mapping process of the 5MHz wireless communication system according to the embodiment of the present invention. The process shown in FIG. 5 will be described below in conjunction with the above frequency partition configuration information. Among them, the number of FFT points of the 5MHz system is 512, and the number of available subcarriers in the subframe is 432, which are divided into 24 physical resource units, each with a size of 18×6. According to the above resource configuration information, the resource mapping process in Figure 5 is described as follows:

Preferably, before the replacement, for the convenience of operation and understanding, 24 physical resource units can be grouped into 6 groups of 0 to 5 as shown in FIG. 5 , and each group is a resource unit group. Next, 4 (n1=4) is used as the replacement unit, that is, 24 (n=24) physical resource units (Physical Resource Unit, PRU for short) are replaced in units of 4 consecutive physical resource units, Use row and column replacement, the replacement matrix is [0, 1, 2; 3, 4, 5], the order before the replacement is [0, 1, 2, 3, 4, 5], and the order after the replacement is [0, 3 , 1, 4, 2, 5]. This processing corresponds to the above-mentioned step 402, as shown by ① in FIG. 5 .

According to the number of physical resource units included in the frequency partition, that is, frequency partition 1 includes 4+4=8 physical resource units, frequency partition 2 includes 10+2=12 physical resource units, and frequency partition 3 includes 4 physical resources For the unit, the groups numbered 0 and 3 are assigned to frequency partition 1, the groups numbered 1, 4, and 2 are assigned to frequency partition 2, and the group numbered 5 is assigned to frequency partition 3. This processing corresponds to the above-mentioned step 404, as shown in ② in FIG. 5 .

For all physical resource units in the frequency partition, according to the frequency partition information, that is, as mentioned above, the centralized resource groups in frequency partition 2 and frequency partition 3 all require a group containing 4 consecutive physical resource units, and the frequency partition is reserved Physical resource group 1 in 2 and physical resource group 5 in frequency partition 3 are not replaced. Physical resource group 1 and physical resource group 5 correspond to physical numbers 4, 5, 6, 7 and 20, 21, 22, and 23, respectively. physical resource units, and permutation operations are performed on the remaining physical resource units in each frequency partition in units of one (n2=1) physical resource unit. For example, taking frequency partition 1 as an example, physical resource groups 0 and 3 in frequency partition 1 correspond to physical resource units with physical numbers 0, 1, 2, 3 and 12, 13, 14, and 15 respectively. Assuming that n2 is equal to 1, Then use row and column replacement, the replacement matrix is [0, 1, 2, 3; 4, 5, 6, 7], and the order before replacement is [0, 12, 1, 13, 2, 14, 3, 15]. Similarly, the physical resource units in the frequency partition 2 are replaced. This processing corresponds to the above-mentioned step 406, as shown in ③ in FIG. 5 .

Next, the permuted physical resource units are divided into centralized resource groups and distributed resource groups according to the configuration information of the frequency partitioned centralized resources and distributed resources. That is, as described above, the 8 physical resource units in frequency partition 1 are divided into a centralized resource group and a distributed resource group, and the centralized resource group and the distributed resource group respectively contain 4 physical resource units, as shown in FIG. As shown in 5, the physical numbers of the four physical resource units included in the centralized resource group are 0, 12, 1, and 13, and the physical numbers of the four physical resource units included in the distributed resource group are 2, 14, 3, and 15; The 12 physical resource units in frequency partition 2 are divided into a centralized resource group and a distributed resource group, wherein the centralized resource group contains 10 physical resource units, and the distributed resource group contains 2 physical resource units, then the centralized The physical numbers of the 10 physical resource units included in the resource group are 4, 5, 6, 7, 16, 8, 17, 9, 18, and 10, and the physical numbers of the 2 physical resource units included in the distributed resource group are 19, 11; and the four physical resource units in the frequency partition 3 form a centralized resource group, and the physical numbers of the four physical resource units included in the centralized resource group are 20, 21, 22, and 23. This processing corresponds to operation 1 in the above step 408, as shown in ④ in FIG. 5 .

Afterwards, the physical resource units in the centralized resource group are directly mapped to logical centralized resource units, and the data subcarriers in the distributed resource group are replaced by circular permutation mapping to obtain logical distributed resource units, where the circular permutation The formula is j'=(a*j+s)mod Nsc, where Nsc is the total number of data subcarriers in the distributed resource group, a and Nsc are relatively prime, s is a number between 0 and Nsc, and j represents the permutation The sequence number of the previous subcarrier, from 0 to Nsc, j' is the sequence number of the circle permutation. This processing corresponds to operation 2 in the above step 408, as shown in ⑤ in FIG. 5 . So far, the mapping from physical units to logical units has been realized.

Through the processing of Example 1, under the multi-carrier system, the physical resource is mapped to the logical resource, and the resource mapping process of the 5MHz wireless communication system is realized.

Example 2

In this example, the frequency partition configuration information is as follows: (1) divide the subframe into 3 frequency partitions, that is, the number of frequency partitions is 3; (2) frequency partitions 1, 2, and 3 respectively include a centralized resource group and A distributed resource group, the centralized resource group and the distributed resource group respectively contain 8 physical resource units; (3) The centralized resource groups in frequency partitions 1, 2, and 3 are required to contain 4 consecutive physical resource units .

FIG. 6 describes the resource mapping process of the 10MHz wireless communication system in the embodiment of the present invention. The process shown in FIG. 6 will be described below in conjunction with the above frequency partition configuration information. Among them, the number of FFT points of the 10MHz system is 1024, and the number of available subcarriers in the subframe is 864, which is divided into 48 physical resource units, and the size of each physical resource unit is 18×6.

Similar to Example 1, before the replacement, 48 physical resource units can be grouped in advance and divided into 12 groups numbered from 0 to 11 as shown in FIG. 6 . Assume that 4 (n1=4) is used as the replacement unit, that is, the replacement operation is performed on 48 physical resource units in units of 4 consecutive physical resource units, row and column replacement is adopted, and the replacement matrix is [0, 1, 2, 3; 4, 5, 6, 7; 8, 9, 10, 11], the order before replacement is [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11] after replacement The order is [0, 4, 8, 1, 5, 9, 2, 6, 10, 3, 7, 11]. This processing corresponds to the above-mentioned step 402, as shown by ① in FIG. 6 .

According to the number of physical resource units contained in the frequency partition, that is, each frequency partition includes 16 physical resource units, the groups numbered 0, 4, 8, and 1 are allocated to frequency partition 1, and the numbers are 5, 9, Groups 2 and 6 are assigned to frequency partition 2, and groups numbered 10, 3, 7, and 11 are assigned to frequency partition 3. This processing corresponds to the above-mentioned step 404, as shown in ② in FIG. 6 .

For all physical resource units in the frequency partition, according to the frequency partition information, that is, as mentioned above, each frequency partition requires 4 consecutive physical resource units, and the group numbered 0 in frequency partition 1 and the group numbered in frequency partition 2 are reserved The group numbered 5 and the group numbered 10 in frequency partition 3 do not perform permutation, and for other physical resource units, permutation operations are performed in each frequency partition in units of one (n2=1) physical resource unit. This processing corresponds to the above-mentioned step 406, as shown in ③ in FIG. 6 .

Frequency partition 1 is taken as an example. Groups numbered 4, 8, and 1 in frequency partition 1 correspond to physical Resource units are replaced by rows and columns, and the replacement matrix is [0, 1, 2, 3; 4, 5, 6, 7; 8, 9, 10, 11], then the order after replacement is [16, 32, 04, 17 , 33, 05, 18, 34, 06, 18, 35, 07]. Similarly, the physical resource units in frequency partition 2 are replaced with the same permutation matrix as frequency partition 1, and the sequence after replacement is [36, 08, 24, 37, 09, 25, 38, 10, 26, 39, 11, 27]; use the same permutation matrix as frequency partition 1 to permute the physical resource units in frequency partition 3, and the sequence after permutation is [12, 28, 44, 13, 29, 45, 14, 30, 46, 15, 31, 47].

According to the configuration information of the centralized resources and the distributed resources of the frequency partition, the permuted physical resource units are divided into a centralized resource group and a distributed resource group. For example, the 16 physical resource units included in frequency partition 1 are divided into a centralized resource group and a distributed resource group, each of which contains 8 physical resource units, as shown in Figure 6, the centralized The physical numbers of the 8 physical resource units included in the distributed resource group are 00, 01, 02, 03, 16, 32, 04, and 17, and the physical numbers of the 8 physical resource units included in the distributed resource group are 33, 05, and 18 , 34, 06, 19, 35, 07; the 16 physical resource units in frequency partition 2 are divided into a centralized resource group and a distributed resource group, each containing 8 physical resource units, as shown in Figure 6, the centralized The physical numbers of the 8 physical resource units included in the resource group are 20, 21, 22, 23, 36, 08, 24, 37, and the physical numbers of the 8 physical resource units included in the distributed resource group are 09, 25, 38, 10, 26, 39, 11, 27; the 16 physical resource units included in frequency partition 3 are divided into a centralized resource group and a distributed resource group, each containing 8 physical resource units, as shown in Figure 6, the centralized The physical numbers of the 8 physical resource units included in the resource group are 40, 41, 42, 43, 12, 28, 44, 13, and the physical numbers of the 8 physical resource units included in the distributed resource group are 29, 45, 14, 30, 46, 15, 31, 47. This processing corresponds to the above-mentioned step 408, as shown in ④ in FIG. 6 .

Afterwards, similar to Example 1, the physical resource units in the centralized resource group are directly mapped to logical centralized resource units, and the data subcarriers in the distributed resource group are replaced by circular permutation mapping to obtain logical distributed resource units .

Through the processing of Example 2, under the multi-carrier system, the physical resource is mapped to the logical resource, and the resource mapping process of the 10MHz wireless communication system is realized.

In the frequency resource mapping process described above, no physical resource unit consisting of guard subcarriers of adjacent carrier frequencies is involved. If there are physical resource units composed of guard frequency bands between adjacent carriers, it is necessary to perform direct mapping on the physical resource units without replacement when performing replacement. The physical resource unit for direct mapping is directly mapped to the centralized resource group of the last frequency partition containing the centralized resource group according to the frequency partition configuration information, that is, it can only be located in the centralized resource group when it is subsequently mapped to the frequency partition , and further directly mapped to logical centralized resource units, the following example 3 gives the implementation process in this scenario. The technical solution of Example 3 is described below in conjunction with FIG. 7 .

Example 3

FIG. 7 is a resource mapping process of a wireless communication system in a multi-carrier mode according to an embodiment of the present invention. In this scenario, there are two adjacent 5MHz systems, and the partially overlapping guard subcarriers in the middle are resource mapped for data transmission. For the first 5MHz system, in addition to 24 physical resource units, 2 physical resource units are formed by guard subcarriers, namely, 24 and 25 as shown in Figure 7, which are composed of guard subcarriers according to the multi-carrier configuration The size of the last of the resource units may not be the standard physical resource unit size. These two physical resource units are used for centralized resource units after direct mapping.

By referring to Fig. 5, the technical solution in this scenario can be better understood. The difference from FIG. 5 is that when the replacement process shown in ① in FIG. 7 is performed, the physical resource units with physical numbers 24 and 25 are directly mapped without replacement. When performing the processing of mapping to the frequency partition as shown in ② in Figure 7, the physical resource units 24 and 25 are mapped to frequency partition 3, and performing the replacement operation in the frequency partition as shown in ③ in Figure 7 When , the replacement operation is not performed, and then as shown in ④ in Figure 7, the direct mapping is mapped to the centralized area, and the subsequent direct mapping is a logical centralized resource unit.

Through this example, frequency resource mapping is realized when there are physical resource units composed of guard subcarriers.

It can be seen from the above description that in the technical solution of Embodiment 1, the physical resource units are replaced first, then mapped to the frequency partition, and then replaced in the frequency partition, and divided into centralized resources and distributed resources , and finally obtain logical distributed resource units and logical centralized resource units through permutation and mapping. The present invention is not limited thereto. Embodiment 2 below provides another implementation. In the technical solution provided by Embodiment 2, before mapping physical resource units to frequency partitions, they are divided into centralized resources and distributed resources. resource, and no replacement is performed in the frequency partition. The technical method of the second embodiment is described in detail below.

Embodiment two

FIG. 8 shows a flowchart of a resource mapping method according to Embodiment 2 of the present invention. As shown in Figure 8, it generally includes the following processing:

Step 802, divide the available subcarriers into n physical resource units, and perform a first permutation operation in units of n1 physical resource units for the n physical resource units;

Step 804, divide the n physical resource units after the first permutation operation into a centralized resource group and a distributed resource group according to the frequency partition configuration information;

Step 806: Perform a second replacement operation in units of n2 physical resource units on the physical resource units in the distributed resource group. In this process, part or all of the physical resources in the centralized resource group may also be the unit performs the second permutation operation;

Step 808: Map the n physical resource units after the second permutation operation to multiple frequency partitions. Specifically, it is necessary to map the physical resource units in the centralized resource group after the second permutation operation as The centralized resource group (centralized area) in the frequency partition, and the physical resource unit mapping in the distributed resource group after the second permutation operation is used as the distributed resource group (distributed area) in the frequency partition, next, The physical resource units in each frequency partition can be mapped to logical resource units. Similar to the first embodiment, the process of obtaining logical resource units here is to directly map the centralized resource units in the frequency partition to logical centralized resource units. It is implemented by performing circular permutation mapping on the data subcarriers in the distributed resource units in the frequency partition to obtain logical distributed resource units.

Example 4

In this example 4, the frequency partition configuration information is as follows: (1) divided into 3 frequency partitions; (2) frequency partition 1 includes a centralized resource group and a distributed resource group, centralized resource group and distributed resource group Each includes 4 physical resource units; frequency partition 2 includes a centralized resource group and a distributed resource group, the centralized resource group includes 6 physical resource units, and the distributed resource group includes 4 physical resource units; frequency partition 3 includes A centralized resource group and a distributed resource group, wherein the centralized resource group includes 2 physical resource units, and the distributed resource group includes 4 physical resource units.

FIG. 9 describes another resource mapping process different from Example 1 of the 5MHz wireless communication system in the present invention. Based on the above frequency partition configuration information, the implementation process of the resource mapping method in Example 3 is described below with reference to FIG. 9 .

Preferably, for ease of understanding, the 24 physical resource units can be divided into 6 groups of 0 to 5 as shown in Figure 9, and then the 24 physical resource units are replaced by 4 (n1=4) units, that is, The replacement operation is performed in units of 4 consecutive physical resource units, using row and column replacement, the replacement matrix is [0, 1, 2; 3, 4, 5], and the order before replacement is [0, 1, 2, 3, 4, 5], the sequence after replacement is [0, 3, 1, 4, 2, 5]. This processing corresponds to step 802 described above.

It can be seen from the frequency partition configuration information that the frequency partition includes a centralized resource group and a distributed resource group. Therefore, the replaced physical resource units are divided into two groups, which are used as centralized resources and distributed resources respectively. For example, physical resource unit groups numbered 0, 3, and 1 are used as centralized resources, and physical resource unit groups numbered 4, 2, and 5 are used as distributed resources. This processing corresponds to the above-mentioned step 804, as shown by ① in FIG. 9 .

Perform a replacement operation on the physical resource units in the distributed resource group in units of one (n2=1) physical resource unit, for example, replace the physical resource units in the physical resource groups numbered 4, 2 and 5, and Perform direct mapping on centralized resources, as shown in ② in Figure 9, the centralized resources after direct mapping are 0, 1, 2, 3, 12, 13, 14, 15, 4, 5, 6, 7; The distributed resources after operation are 16, 8, 20, 17, 9, 21, 18, 10, 22, 19, 11, 23. This processing corresponds to step 806 described above.

Afterwards, according to the frequency partition configuration information, specifically, according to the data of the centralized physical resource units and distributed physical resource units in each frequency partition, the n physical resource units after the above permutation and mapping operations are mapped to 3 frequency partition, as shown in ③ of Figure 9, the physical resource units numbered 0, 1, 2, and 3 are mapped to the centralized resource group (centralized area) in frequency partition 1 as a centralized resource, and the numbers are 16, 2, and 3. The physical resource units of 8, 20, and 7 are mapped to the distributed resource group (distributed area) of frequency partition 1 as distributed resources; the physical resource units numbered 12, 13, 14, 15, 4, and 5 are mapped to frequency partitions The centralized area of 2 is used as a centralized resource, and the physical resource units numbered 9, 21, 18, and 10 are mapped to the distributed area of frequency partition 2 as distributed resources; the physical resource units numbered 6 and 7 are mapped to frequency partitions The centralized area of 3 is used as a centralized resource, and the physical resource units numbered 22, 19, 11, and 23 are mapped to distributed areas in frequency partition 3 as distributed resources.

Afterwards, as shown in ④ in Figure 9, the physical resource units in the centralized resource group are directly mapped to logical centralized resource units, and the data subcarriers in the distributed resource group are replaced by circular permutation mapping to obtain logical Distributed resource unit. The above processing corresponds to the above step 808 . So far, frequency resource unit mapping has been realized.

What is described above is the method of only replacing the distributed resources and directly mapping the centralized resources when performing the second replacement. This method is more suitable for scenarios where the loads of each In the scenario where the load of the frequency partition is relatively average, some or all of the centralized resources can also be replaced at the same time. The following example 5 shows the implementation.

Example 5

The frequency partition configuration information in Example 5 is as follows: (1) divide the subframe into 3 frequency partitions, that is, the number of frequency partitions is 3; (2) frequency partitions 1, 2, and 3 respectively include a centralized resource group and a distributed resource group, the centralized resource group and the distributed resource group respectively include 8 physical resource units; (3) each frequency partition includes 4 continuous physical resource units.

FIG. 10 describes another resource mapping process different from example 2 of the 10MHz wireless communication system in the embodiment of the present invention. The process shown in FIG. 10 will be described below in conjunction with the above frequency partition configuration information.

Before the replacement, 48 physical resource units may be grouped in advance, and divided into 12 groups numbered from 0 to 11 as shown in FIG. 10 . For the 48 physical resource units, 4 (n1=4) is used as the replacement unit, that is, the replacement operation is performed in units of 4 consecutive physical resource units, and the row and column replacement is adopted, and the replacement matrix is [0, 1, 2, 3; 4, 5, 6, 7; 8, 9, 10, 11], the order before the replacement is [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11], after the replacement The order is [0, 4, 8, 1, 5, 9, 2, 6, 10, 3, 7, 11]. This processing corresponds to the above-mentioned step 802, as shown by ① in FIG. 10 .

It can be seen from the configuration information of the frequency partition that the frequency partition includes a centralized resource group and a distributed resource group, so the replaced physical resource units are divided into two groups, which are used as centralized resources and distributed resources respectively. For example, 0, 4, 8, 1, 5, and 9 are used for centralized resources, and 2, 6, 10, 3, 7, and 11 are used for distributed resources. This processing corresponds to the above-mentioned step 804, and the above-mentioned process is shown as ② in FIG. 10 .

According to the frequency partition configuration information, each frequency partition needs a centralized resource composed of four consecutive physical resource units, so as shown in ③ in Figure 10, the physical resource unit groups numbered 0, 4, and 8 are reserved, while The physical resource unit groups numbered 1, 5, and 9 are replaced in units of n2 physical resource units. At the same time, the physical resource units in the distributed resource group are replaced in units of n2 physical resource units. For 2, The physical resource units in 6, 10, 3, 7 and 11 are replaced. This processing corresponds to step 806 described above.

According to the frequency partition configuration, the centralized resource units and distributed resource units after the permutation operation are mapped to each frequency partition. As shown in ④ in Figure 10, the physical resource units numbered 00, 01, 02, 03, 04, 20, 36, and 05 are mapped to the centralized resource groups in frequency partition 1, and the physical resource units numbered 08, 24, The physical resource units of 40, 12, 28, 44, 09, and 25 are mapped to the distributed resource groups in frequency partition 1, and the physical resource units numbered 16, 17, 18, 19, 21, 37, 06, and 22 are mapped To the centralized resource group in frequency partition 2, map the physical resource units numbered 41, 13, 29, 45, 10, 26, 42, and 14 to the distributed resource group in frequency partition 2, and map the physical resource units numbered 32, The physical resource units of 33, 34, 35, 36, 07, 23, and 39 are mapped to the centralized resource group in frequency partition 3, and the physical resources numbered 30, 46, 11, 27, 43, 15, 31, and 47 The cells are mapped to distributed resource groups in frequency partition 3.

Afterwards, as shown in ⑤ in Figure 10, the physical resource units in the centralized resource group are directly mapped to logical centralized resource units, and the data subcarriers in the distributed resource group are replaced by circular permutation mapping to obtain logical Distributed resource unit. The above processing corresponds to the above step 808 . So far, frequency resource unit mapping has been realized.

In addition, in the technical solution provided by Embodiment 2, similar to Embodiment 1, for the physical resource units composed of guard subcarriers of adjacent carrier frequencies included in the available subcarriers, no permutation operation is performed on them, but according to the frequency partition The configuration information is mapped to a logical localized resource unit in the last frequency partition containing the localized resource group.

Example 6

In the above-described embodiments, for the sake of easy understanding, the embodiment of the present invention is described by taking the case of n2=1 as an example, but the present invention is not limited thereto, and n2 can be flexibly selected according to different application scenarios, as shown in Figure 11 The resource mapping process of the 20MHz wireless communication system in the embodiment of the present invention is given. As shown in FIG. 11 , the main difference between this processing process and the processing of the above-mentioned examples is that n2=2, that is, two physical resource units are used as replacement units to perform the above-mentioned second replacement operation. Other same or similar details of this process can be understood and implemented with reference to other examples, and will not be repeated here.

In summary, with the help of the present invention, the frequency resource mapping process based on multi-carrier technology is regulated, so that the base station can select an appropriate resource scheduling granularity according to scheduling needs, obtain frequency selection gain and frequency diversity gain, and can adapt to multi-carrier systems such as OFDMA Requirements, the flexibility of wireless resource scheduling is guaranteed, and the frequency efficiency of the multi-carrier system is ensured.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (16)

1. A resource mapping method based on multiple carriers, comprising: Divide the available subcarriers into n physical resource units, and perform a first permutation operation on the n physical resource units, where the first permutation operation takes n1 physical resource units as a unit; mapping the n physical resource units after the first permutation operation to multiple frequency partitions according to frequency partition configuration information; In each frequency partition, perform a second permutation operation on some or all of the physical resource units, where the second permutation operation takes n2 physical resource units as a unit; mapping the physical resource units after the second permutation operation into logical resource units; Wherein, n, n1, and n2 are all integers greater than or equal to 1, and n is greater than or equal to n1, n2. 2. The method according to claim 1, wherein, in each frequency partition, performing the second permutation operation on part or all of the physical resource units comprises: For a frequency partition that needs to reserve continuous physical resource units for the centralized resource group, perform the second permutation operation on the physical resource units in the frequency partition except for the reserved continuous physical resource units; For a frequency partition that does not need to reserve continuous physical resource units for the localized resource group, perform the second permutation operation on all physical resource units in the frequency partition. the 3. The method according to claim 1, wherein mapping the physical resource units after the second permutation operation into logical resource units comprises: In each frequency partition, divide the physical resource units after the second permutation operation into a centralized resource group and/or a distributed resource group according to the frequency partition configuration information; Directly map the physical resource units in the centralized resource group to logical centralized resource units, and/or perform a third permutation operation on the data subcarriers in the distributed resource group to obtain logical distributed resource units. 4. The method according to claim 3, wherein the subcarriers in the logical centralized resource unit are continuous, and the subcarriers in the logical distributed resource unit are discontinuous or continuous in pairs or every 4 subcarriers The carrier is continuous. 5. The method according to claim 3, characterized in that, the first permutation operation, the second permutation operation, and the third permutation operation all adopt one of the following or a combination thereof according to the permutation length: row and column permutation, Circular permutation maps, uniformly drawn permutations, sequence-specific permutations, and random permutations. 6. The method according to claim 5, wherein when the first permutation operation is the uniform extraction permutation, physical resource units are extracted at equal intervals from the n physical resource units in units of n1 physical resource units. Resource units are replaced. 7. The method according to claim 1, further comprising: The physical resource units composed of guard subcarriers of adjacent carrier frequencies included in the available subcarriers are directly mapped to the last localized resource group of the frequency partition containing the localized resource group according to the frequency partition configuration information. the 8. The method according to any one of claims 1 to 7, characterized in that n1 is greater than n2. 9. The method according to any one of claims 1 to 7, wherein the frequency partition configuration information includes at least one of the following: the number of frequency partitions, the size of the frequency partitions and/or the distribution in the frequency partitions The size of the localized resource group and/or the size of the localized resource group, the number of contiguous physical resource units in the frequency partitioned localized resource group, wherein the contiguous physical resource units belong to the same The physical resource unit of the replacement unit. 10. A resource mapping method based on multi-carriers, comprising: Divide the available subcarriers into n physical resource units, and perform a first permutation operation on the n physical resource units, where the first permutation operation takes n1 physical resource units as a unit; dividing the n physical resource units after the first permutation operation into a centralized resource group and a distributed resource group according to frequency partition configuration information; performing a second replacement operation on the physical resource units in the distributed resource group and/or some or all of the physical resources in the centralized resource group, where the second replacement operation takes n2 physical resource units as a unit ; mapping the n physical resource units after the second permutation operation to multiple frequency partitions, and mapping the physical resource units in each frequency partition to logical resource units; Wherein, n, n1, and n2 are all integers greater than or equal to 1, and n is greater than or equal to n1, n2. the 11. The method according to claim 10, wherein mapping the physical resource units after the second permutation operation to multiple frequency partitions comprises: According to the frequency partition configuration information, map the physical resource units in the centralized resource group after the second permutation operation as the centralized resource units in the frequency partition, and map the distributed resource group after the second permutation operation The physical resource units in are mapped as distributed resource units in the frequency partition. 12. The method according to claim 11, wherein the mapping of physical resource units in the frequency partition into logical resource units comprises: directly mapping the centralized resource units in the frequency partition to logical centralized resource units, and/or performing a third permutation operation on the data subcarriers in the distributed resource units in the frequency partition to obtain logical distributed resources unit. 13. The method according to claim 12, wherein the subcarriers in the logical centralized resource unit are continuous, and the subcarriers in the logical distributed resource unit are discontinuous or continuous in pairs or every 4 subcarriers The carrier is continuous. 14. A method according to any one of claims 10 to 13, characterized in that n1 is greater than n2. 15. The method according to any one of claims 10 to 13, wherein the frequency partition configuration information includes at least one of the following: the number of frequency partitions, the size of the frequency partitions and/or the distribution in the frequency partitions The size of the localized resource group and/or the size of the localized resource group, the number of contiguous physical resource units in the frequency partitioned localized resource group, wherein the contiguous physical resource units belong to the same The physical resource unit of the replacement unit. the 16. The method of claim 10, further comprising: For the physical resource units composed of guard subcarriers of adjacent carrier frequencies included in the available subcarriers, map to logical centralized resource units in the last frequency partition containing the localized resource group according to the frequency partition configuration information. the

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