CN101102140B - Distributed resource mapping method - Google Patents
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- CN101102140B CN101102140B CN200710142020A CN200710142020A CN101102140B CN 101102140 B CN101102140 B CN 101102140B CN 200710142020 A CN200710142020 A CN 200710142020A CN 200710142020 A CN200710142020 A CN 200710142020A CN 101102140 B CN101102140 B CN 101102140B
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Abstract
The invention is concerned with the mapping method of the distributing source, includes: Setup the logic number for the sub frame physics source piece of the system band width and each the distributing dummy source piece separately; Distilling all or part of the physics source piece to use as the distributing physics source piece with several data unit and reordering the data unit; the reordered data unit can be used as the distributing dummy source piece opposite the logic number of the distributing dummy source piece.
Description
Technical field
The present invention relates to the communications field, and especially, relate to a kind of based on frequency division multiplex (Orthogonal Frequency Division Multiplexing, the OFDM) distributed resource mapping method of system.
Background technology
At present, the OFDM technology is fast-developing, and by feat of many advantages, this technology has been called one of main candidate scheme of following wireless communication technology.
The OFDM technology is divided into many orthogonal sub-carriers with given channel in frequency domain, difference modulation signal on each subcarrier, and each subcarrier parallel transmission.Like this, although the frequency response curve of wireless channel is a non-flat forms, has frequency selectivity; But the frequency response in each subcarrier; What on each subcarrier, carry out is narrow band transmission, and signal bandwidth is less than channel width, so the interference between the erasure signal waveform greatly.And because each number of sub-carrier is mutually orthogonal in ofdm system, and their frequency spectrum is overlapped, so not only reduced the phase mutual interference between subcarrier, and the while has been improved the availability of frequency spectrum again.OFDM utilizes inverse fast fourier transform/FFT (IFFT/FFT) to replace multi-carrier modulation and demodulation in addition, has reduced the complexity of Base-Band Processing.
In ofdm system; Because resource is with the appearance of time and frequency bidimensional, so resource allocation and method for expressing more complicated, especially bandwidth are when very big; Not only to consider the flexibility of resource allocation, also will consider the requirements such as simple and little expense of method for expressing.
At present; Method commonly used is a definition virtual resource blocks VRB (Virtual ResourceBlock) and a Physical Resource Block PRB (Physical Resource Block); The size of VRB equals the size of PRB, and VRB is mapped on the PRB according to certain rule.When a VRB only is mapped on the PRB; Be called localized transmission (localizedtransmission), this PRB is called as LPRB (Localized PRB), and VRB is called LVRB (Localized VRB); When a VRB is mapped to two or more PRB; Be called distributed transmission (distributed transmission), these PRB that shone upon are called as DPRB (Distributed PRB), and corresponding VRB is called DVRB (Distributed VRB).The purpose of using distributed transmission is in order to obtain frequency diversity, and localized transmission and distributed transmission all can be multiplexing with the mode of FDM.Because there be the mapping mode of multiple DVRB to DPRB in distributed transmission, so the performance of every kind of mapping mode and corresponding resource allocation signal expense are all different.
Present existing scheme method of salary distribution underaction can make resource dispatching strategy limited, and all there are defective in diversity gain and interference aspect, adjacent area.
Yet, the scheme that can also obtain bigger frequency diversity with lower signaling consumption support resource allocation more flexibly, can also reduce neighbor cell interference is simultaneously proposed so far as yet.
Summary of the invention
Consider the problems referred to above and make the present invention that for this reason, main purpose of the present invention is to provide a kind of distributed resource mapping scheme.
According to embodiments of the invention, a kind of distributed resource mapping method is provided.
This method comprises: step S102; Physical Resource Block in each subframe in the system bandwidth is provided with the logic number of Physical Resource Block respectively; And the logic number that each distributed virtual resource block is provided with distributed virtual resource block respectively; Wherein, the logic number of Physical Resource Block is corresponding to the logic number of virtual resource blocks; Step S104 extracts all or part of said Physical Resource Block as distributed physical resource blocks, and each distributed physical resource blocks is divided into a plurality of data cells, and extracts all or part of Physical Resource Block as distributed physical resource blocks; Step S106 resequences to the data cell of distributed physical resource blocks; And step S108, according to distributed virtual resource block, be divided into a plurality of data cell after the rearrangement and logic number corresponding distributed virtual resource blocks distributed virtual resource block.
Wherein, distributed virtual resource block and distributed physical resource blocks is big or small identical.
And, in step S104, extract the part Physical Resource Block as the distributed physical resource blocks situation under, the method for extraction comprises: uniformly-spaced extract, unequal interval extracts, random extraction.
In addition, in step S106, can logic number be set respectively to said a plurality of data cells of said Physical Resource Block, and the data cell of distributed physical resource blocks be resequenced: f based on the logic number of said data cell and according to following formula
i=((k * i) mod n)+1, i=0,1 ..., n-1, wherein, i representes i data unit; N representes the sum of data cell on the OFDM symbol; K is the positive integer relatively prime with n, and 1≤k＜n.
In addition, in step S108,, the data cell after the rearrangement is divided into a plurality of distributed virtual resource block according to the size of distributed virtual resource block.
In addition, in the method, each data cell comprises the OFDM symbol and the subcarrier of equal number.And the subcarrier on the OFDM symbol is in identical or different position.
In addition, this method can further include: different mapping relationships is set up in each sub-district, with the randomization that realizes disturbing between the neighbor cell.The mode of interference randomization comprises: public rearrangement mode is adopted in each sub-district, and the sequence after resetting is adopted different cyclic shifts, to obtain the proprietary mapping relations of each sub-district in each sub-district.
This method can further include: the mapping relations of the distributed virtual resource block of dividing after Physical Resource Block and the rearrangement are stored to the base station; And when user access network, the base station sends to the user with mapping relations; When transfer resource, the base station sends to the user with the logic number of distributed virtual resource block, and the user obtains resource according to the logic number and the mapping relations of distributed virtual resource block.
Through technique scheme of the present invention, can reduce the restriction of scheduling, support resource allocation more flexibly, can reduce the adjacent area well and disturb; And the present invention has lower complexity and good time-frequency diversity gain.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the distributed resource mapping method of the embodiment of the invention;
Fig. 2 is the structural representation according to Physical Resource Block in the distributed resource mapping method of the embodiment of the invention;
Fig. 3 is the structural representation according to data cell in the distributed resource mapping method of the embodiment of the invention; And
Fig. 4 is according to logic number mapping sketch map between distributed virtual resource block and the Physical Resource Block in the distributed resource mapping method of the embodiment of the invention.
Embodiment
In the present embodiment, a kind of distributed resource mapping method is provided.
As shown in Figure 1, comprise according to the distributed resource mapping method of present embodiment: step S102 is provided with the logic number of PRB respectively to the PRB in each subframe in the system bandwidth; Wherein, logic number i representes i PRB, and; 1≤i≤N_PRB, wherein N_PRB representes the sum of PRB; Each DVRB is provided with the logic number of DVRB respectively, and the method for numbering is identical with the method for numbering serial of PRB, and wherein, logic number j representes j VRB, and 1≤i≤N_VRB, N_DVRB represent the sum of DVRB; And the logic number of PRB is corresponding one by one with the logic number of VRB;
Step S104; Extract all or part of PRB as DPRB, and with each DPRB be divided into a plurality of data cells (Data Unit, DU); Wherein, Each data cell comprises the OFDM symbol and the subcarrier of equal number, and the subcarrier that belongs to same Physical Resource Block among the same DU can be continuous physically, also can be discontinuous physically; And belonging in the same data cell subcarrier on the different OFDM symbols can be in identical position, also can be in different positions;
Step S106 to each data cell of DPRB assignment logic number respectively, and resequences to the data cell of DPRB; And
Step S108 according to DVRB, is divided into a plurality of DVRBs corresponding with the logic number of DVRB with the data cell after the rearrangement,, has realized the mapping after the rearrangement that is.
Wherein, above-mentioned DVRB is big or small identical with DPRB's, and, DPRB is mapped as DVRB after, its corresponding physical subcarrier of DVRB of different sub-district identity logic numberings can be identical also can be incomplete same.
And, in step S104, extract part PRB as the DPRB situation under, the method for extraction comprises: uniformly-spaced extract, unequal interval extracts, random extraction.Alternatively; Under situation about uniformly-spaced extracting; Can begin from initial position a; With interval d, choose PRB as DPRB, wherein
In addition; In step S106, can DPRB order from PRB be extracted series connection, the resource after the series connection is divided according to the DU size; For each DU compiles a logic number, based on this logic number and according to following formula the data cell of distributed PRB is resequenced: f
i=((k * i) mod n)+1, i=0,1 ..., n-1, wherein, i representes i data unit; N representes the sum of data cell on the OFDM symbol; K is the positive integer relatively prime with n, and 1≤k＜n.The purpose that should be noted that rearrangement is with the DU randomization, and its concrete mode is not limited to aforesaid way.
In addition, in step S108, can be according to the size of DVRB, the data cell after the rearrangement is divided into n DVRB, and the DVRB logic number correspondence that still is provided with in the step S102 of this division DVRB.
In addition, this method can further include: different mapping relationships is set up in each sub-district, carries out the randomization that disturb the adjacent area to realize each sub-district.Wherein, randomized mode comprises:, public rearrangement mode is adopted in each sub-district, and the sequence after resetting is adopted different cyclic shifts, to obtain the proprietary mapping relations in each sub-district in each sub-district.When adopting cyclic shift; Can use different above-mentioned k values also can use identical k value to different sub-districts; And each sub-district uses different cyclic shift amounts different, thereby makes in different districts, even the logic number of identical DVRB; Its corresponding physical subcarrier is also incomplete same, thereby has realized the discretization of resource.
Afterwards, in the transmission course of resource, can the mapping relations of the DVRB that divide after PRB and the rearrangement be stored to the base station; And when user's (receiving terminal) access network, the base station sends to the user with mapping relations, and the mode of transmission can comprise modes such as dynamic transmission, semi-static transmission and static transmission; When transfer resource, the quantity of DVRP sends to the user on the logic number of the DVRB that the base station will be shone upon and the whole bandwidth, and the user obtains resource according to logic number and the mapping relations of DVRB.
Below will be with 3GPP (3rd Generation Partnership Project; Third generation partner program) LTE (Long Term Evolution; The Long Term Evolution plan) FDD (Frequency Division Duplex, frequency division multiplexing) system is an example, describes the present invention in detail.
In this example, suppose that bandwidth is 5MHz, then number of usable subcarriers is 300, contains 14 continuous OFDM symbols in the sub-frame.With continuous 12 number of sub-carrier, Resource Block PRB of continuous 14 OFDM symbolic representations, therefore, in a sub-frame, contain 25 PRB in this example, wherein the structure of PRB is as shown in Figure 2.And, originally executing in the example with continuous 2 number of sub-carrier, a data cells D of OFDM symbolic representation U, so contain 84 DU among a PRB, wherein the structure of DU is as shown in Figure 3.
Under LTE 5MHz system bandwidth; Suppose to have 3 DPRB, 22 LPRB make that the initial chosen position a of DPRB is 1; DPRB begins according to interval d DPRB to be mapped on the PRB from first PRB; Wherein,
N_PRB is the quantity of PRB, and N_DPRB is the quantity of DPRB; So DPRB is mapped to respectively on the 1st PRB, the 9th PRB and the 17th PRB.
Then, DPRB is extracted series connection, the resource after the series connection is divided according to the size of DU, then on each OFDM symbol 18 DU are arranged; For the DU on each OFDM symbol numbers in order, according to formula f=((k * i) mod n)+1, i=0,1;, n-1, wherein, k is a constant 7; N is the sum of DU on the OFDM symbol, and this moment, n was 18, and 18 DU on first symbol are arranged again, and the sequence after arranging again is S
1=1,8,15,4,11,18,7,14,3,10,17,6,13,2,9,16,5,12}; Suppose that current area ID is 0, so, do not need cyclic shift, sequence S
iBe the retracing sequence of current area, the retracing sequence S on each symbol
i(i=2,3 ..., 14), can be according to the retracing sequence S on first symbol
1Produce, the generation formula is S
i=(S
1+ i-1) mod 14, i=2,3 ..., 14; At last, the DU sequence after all rearrangements is divided according to the PRB size, and shine upon one by one with the logic number of DVRB, so just set up the mapping relations between DVRB and the PRB, this relation is as shown in Figure 3.
Then, the mapping relations with the mapping ruler of above-mentioned DVRB-PRB are stored in base station and recipient UE (User Equipment, user terminal) side.The base station only need send control signaling and notify UE (the User Equipment that adopts the discrete way transmission with its DVRB logic number that obtains and total DPRB quantity; User terminal); UE just can extract data according to the mapping relations between DVRB logic number and the PRB logic number on the physical resource that distributes.In addition, the different logical mapping ruler can be set up in different sub-districts, to realize randomizing neighborhood cell interference.
In sum, the present invention proposes a kind of effective DVRB to the DPRB mapping scheme, this method can reduce the restriction of scheduling, supports resource allocation more flexibly, can reduce the adjacent area well and disturb; And the present invention has lower complexity and good time-frequency diversity gain.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a distributed resource mapping method is characterized in that, comprising:
Step S102; Physical Resource Block in each subframe in the system bandwidth is provided with the logic number of said Physical Resource Block respectively; And the logic number that each distributed virtual resource block is provided with said distributed virtual resource block respectively; Wherein, the logic number of said Physical Resource Block is corresponding to the logic number of said virtual resource blocks;
Step S104 extracts all or part of said Physical Resource Block as distributed physical resource blocks, and each said distributed physical resource blocks is divided into a plurality of data cells;
Step S106 resequences to the data cell of said distributed physical resource blocks; And
Step S108; According to said distributed virtual resource block, the said data cell after the rearrangement is divided into a plurality of said distributed virtual resource block corresponding with the logic number of said distributed virtual resource block, wherein; Different mapping relationships is set up in each sub-district; With the randomization that realizes disturbing between the neighbor cell, wherein, the mode of said interference randomization comprises: public rearrangement mode is adopted in said each sub-district; And to the different cyclic shift of data unit sequence employing after resetting, to obtain the proprietary mapping relations in each sub-district in said each sub-district.
2. distributed resource mapping method according to claim 1 is characterized in that, said distributed virtual resource block is big or small identical with said distributed physical resource blocks.
3. distributed resource mapping method according to claim 1; It is characterized in that; In said step S104, extract the said Physical Resource Block of part as the distributed physical resource blocks situation under, the method for extraction comprises: uniformly-spaced extract, unequal interval extracts, random extraction.
4. distributed resource mapping method according to claim 1; It is characterized in that; In said step S106; Said a plurality of data cells to said Physical Resource Block are provided with logic number respectively, and based on the logic number of said data cell and according to following formula the data cell of said distributed physical resource blocks are resequenced: f
i=((k * i) mod n)+1, i=0,1 ..., n-1, wherein, i representes i said data cell; N representes the sum of data cell on the OFDM symbol; K is the positive integer relatively prime with n, and 1≤k＜n.
5. distributed resource mapping method according to claim 1 is characterized in that, in said step S108, according to the size of said distributed virtual resource block, the said data cell after the rearrangement is divided into a plurality of said distributed virtual resource block.
6. distributed resource mapping method according to claim 1 is characterized in that, each said data cell comprises the OFDM symbol and the subcarrier of equal number.
7. distributed resource mapping method according to claim 6 is characterized in that, the said subcarrier on the said OFDM symbol is in identical or different position.
8. according to each described distributed resource mapping method in the claim 1 to 7, it is characterized in that, further comprise:
The mapping relations of the said distributed virtual resource block of dividing after said Physical Resource Block and the rearrangement are stored to the base station; And
When user access network, said base station sends to said user with said mapping relations; When transfer resource, said base station sends to said user with the logic number of said distributed virtual resource block, and said user obtains said resource according to the logic number and the said mapping relations of said distributed virtual resource block.
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| US8289935B2 (en) | 2008-02-04 | 2012-10-16 | Nokia Siemens Networks Oy | Method, apparatus and computer program to map a cyclic shift to a channel index |
| CN102487512B (en) * | 2010-12-03 | 2014-11-05 | 中国移动通信集团公司 | Interference control method and device |
| CN103369675B (en) * | 2012-04-06 | 2016-01-27 | 华为技术有限公司 | A kind of resource allocation method and device |
| EP3457650A4 (en) * | 2016-05-13 | 2020-01-01 | Fujitsu Limited | Resource mapping method and device, and communication system |
| CN110034888A (en) | 2018-01-12 | 2019-07-19 | 华为技术有限公司 | A kind of wireless communication device and wireless communications method |
| CN112187422B (en) * | 2019-07-02 | 2023-08-11 | 北京中兴高达通信技术有限公司 | Logic resource transmission method and system |
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| ZTE等.Downlink Data Multiplexing and Mapping Rules.《3GPP TSG-RAN WG1 Adhoc meeting on LTE,Cannes,France,June 27th-30th,2006,R1-061763》.2006,正文第3-6节. * |
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