CN101247382A - Distributed transmission resource mapping method and apparatus based on OFDM system - Google Patents
Distributed transmission resource mapping method and apparatus based on OFDM system Download PDFInfo
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Abstract
The invention provides a mapping method and device for distributed transmission resources based on OFDM system, the method comprises the following steps of: dividing the DVRB of the OFDM system into multi-groups according to the logical number orderly and evenly; group intertwining the logical number of the DVRB of each group according to the no.; groups intertwining the groups which have been group intertwined according to the no. of slot time; the logical number of DVRB after the groups intertwining is acted as the logical number of the corresponding physical resources block. The invention realizes that supporting more flexible resource allocation with lower signaling overhead and getting more frequency diversity, as well as better supporting the service type which is continuously managing.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of distributed transmission resource mapping method and device based on OFDM (Orthogonal Frequency Division Multiplexing, OFDM) system.
Background technology
In ofdm system, because resource occurs with time and frequency bidimensional, so resource allocation and method for expressing thereof become more complicated, especially bandwidth ratio when big, should consider the flexibility of resource allocation, consider requirements such as the simple and expense of method for expressing is little again.Method commonly used at present is defining virtual Resource Block VRB (Virtual ResourceBlock) and Physical Resource Block PRB (Physical Resource Block), and the size of VRB equals the size of PRB.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 centralized Physical Resource Block L-PRB (LocalizedPRB), and VRB is called localized virtual resource block LVRB (Localized VRB).When a VRB is mapped to two or more PRB, be called distributed transmission (distributed transmission), these mapped PRB are called distributed physical resource blocks D-PRB (Distributed PRB), and corresponding VRB is called distributed virtual resource block DVRB (Distributed VRB).Using the purpose of distributed transmission is in order to obtain frequency diversity.Localized transmission and distributed transmission are multiplexing in the mode of FDM (Frequency DivisionMultiplexing, frequency division multiplexing).
Each DVRB can only be to the N of fixed qty
d(N
d〉=2) individual PRB mapping, the some DVRB for being mapped on the identical PRB are mapped to respectively on the different subcarriers according to certain rule.Because there be the mapping mode of multiple DVRB to DPRB in distributed transmission, and the performance of every kind of mapping mode and corresponding resource allocation signal expense are all different.In realizing process of the present invention, the inventor finds that prior art exists signaling consumption big, the problem of underaction.
Summary of the invention
The present invention aims to provide a kind of distributed transmission resource mapping method and device based on ofdm system, and the expense that exists with the distributed transmission resource mapping that solves prior art is big, the problem of underaction.
In an embodiment of the present invention, provide a kind of distributed transmission resource mapping method, may further comprise the steps: the DVRB of ofdm system sequentially has been divided into a plurality of groups equably according to its logic number based on ofdm system; Interweave in according to numbering the logic number of every group DVRB being organized; Interweave between according to the sequence number of time slot a plurality of groups after interweaving in organizing being organized; With the logic number of the DVRB after interweaving between group logic number as its corresponding physical Resource Block.
Preferably, the DVRB of ofdm system sequentially is divided into a plurality of groups equably according to its logic number specifically to be comprised: according to the size of the logic number of DVRB, sequentially equably the logic number of DVRB is divided into the S group, and sequentially number for the logic number of DVRB, wherein, every group of size is L, and L=k * n, k and n are positive integer; Interweave in according to numbering the logic number of every group DVRB being organized and specifically comprise: the matrix of the capable n row of structure k, the logic number of the DVRB that each group is comprised is input in the matrix according to the sequence number of row line by line; The DVRB logic number of reading DVRB according to the sequence number of row by row from this matrix is input in a plurality of groups.
Preferably, S=2, the quantity of Physical Resource Block is NPRB, then the DVRB of ofdm system sequentially is divided into a plurality of groups equably according to its logic number and specifically comprises: n=p * p is set, and p is the quantity of resource group set under the current bandwidth,
Perhaps,
Preferably, S=4, the quantity of Physical Resource Block is NPRB, then the DVRB of ofdm system sequentially is divided into a plurality of groups equably according to its logic number and specifically comprises: n=p * p is set, and p is the quantity of resource group set under the current bandwidth,
Preferably, interweaving between according to the sequence number of time slot a plurality of groups after interweaving in organizing being organized specifically comprises: according to the sequence number of time slot, with a plurality of groups of sizes orderings according to group number; A plurality of groups of cyclic shifts, shift amount are the size of time slot sequence number; Perhaps, exchange in pairs between each group; Sequentially read the logic number of the DVRB in a plurality of groups, the logic number of the DVRB that obtains arranging.
Preferably, S=2, interweaving between according to the sequence number of time slot a plurality of groups after interweaving in organizing being organized specifically comprises: in first time slot, the order of group does not change, and in second time slot, exchanges 2 groups order.
Preferably, S=4, interweaving between according to the sequence number of time slot a plurality of groups after interweaving in organizing being organized specifically comprises: in first time slot, the order of group does not change, in second time slot, first group and second group of exchange sequence, the 3rd group and the 4th group of exchange sequence, perhaps, first group and the 3rd group of exchange sequence, second group and the 4th group of exchange sequence, perhaps, first group and the 4th group of exchange sequence, second group and the 3rd group of exchange sequence.
Preferably, the DVRB of ofdm system sequentially being divided into a plurality of groups equably according to its logic number specifically comprises: if can not divide equally, then the DVRB with last remainder divides one group of specific group into, as last group.
Preferably, interweave in according to numbering the logic number of every group DVRB comprising the feature group being organized, or the logic number of every group DVRB except that the feature group interweaves in organizing; And according to the sequence number of time slot a plurality of groups of feature group of comprising after interweaving in organizing are interweaved between organizing, or except that the feature group a plurality of groups interweave between organizing.
In an embodiment of the present invention, also provide a kind of distributed transmission resource mapping device based on ofdm system, having comprised: grouping module is used for the DVRB of ofdm system sequentially is divided into a plurality of groups equably according to its logic number; Interleaving block in the group interweaves in being used for according to numbering the logic number of every group DVRB being organized; Interleaving block between group interweaves between being used for according to the sequence number of time slot a plurality of groups after interweaving in organizing being organized; Mapping block is used for sequentially reading the logic number of a plurality of groups DVRB, and the DVRB logic number after obtaining arranging is as the logic number of its corresponding physical Resource Block.
Preferably, grouping module is according to the size of the logic number of DVRB, sequentially equably the logic number of DVRB is divided into the S group, and sequentially numbers for the logic number of DVRB, and wherein, every group of size is L, and L=k * n, k and n are positive integer; Interleaving block specifically comprises in the group: structural unit, be used to construct the matrix of the capable n row of k, and the logic number of the DVRB that each group is comprised is input in the matrix according to the sequence number of row line by line; Interleave unit is used for pursuing the DVRB logic number that row are read DVRB from this matrix according to the sequence number of row, is input in a plurality of groups.
Preferably, grouping module is according to the size of the logic number of DVRB, sequentially equably the logic number of DVRB is divided into the S group, and sequentially numbers for the logic number of DVRB, and wherein, every group of size is L, and L=k * n, k and n are positive integer; Interleaving block specifically comprises between group: row organizes the unit, is used for the sequence number according to time slot, with a plurality of groups of size orderings according to group number; Shift unit is used for a plurality of groups of cyclic shifts, and shift amount is the size of time slot sequence number; Perhaps, each group pairing exchange in twos; Sequencing unit is used for sequentially reading the logic number of a plurality of groups DVRB, the logic number of the DVRB that obtains arranging.
The mapping method of the foregoing description and device because adopted interweave in the group and organize between the means that interweave, so it is big to have solved the expense that the distributed transmission resource mapping of prior art exists, the problem of underaction, and then realized with lower signaling consumption support resource allocation more flexibly and the bigger frequency diversity of acquisition, simultaneously, support the type of service of continuous dispatching better.
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 shows the flow chart based on the distributed transmission resource mapping method of ofdm system according to the embodiment of the invention;
Fig. 2 shows the block diagram based on the distributed transmission resource mapping device of ofdm system according to the embodiment of the invention;
Fig. 3 shows the schematic diagram according to the PRB of the embodiment of the invention;
Fig. 4 shows according to the DVRB of the embodiment of the invention and the schematic diagram of LVRB.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Fig. 1 shows the flow chart based on the distributed transmission resource mapping method of ofdm system according to the embodiment of the invention, may further comprise the steps:
Step S10 sequentially is divided into a plurality of groups with the DVRB of ofdm system equably according to its logic number;
Step S20 interweaves in according to numbering the logic number of every group DVRB being organized;
Step S30 interweaves between according to the sequence number of time slot a plurality of groups after interweaving in organizing being organized;
Step S40 is with the logic number of the DVRB after interweaving between the group logic number as its corresponding physical Resource Block.
Can send resource allocation control signaling then, the DVRB logic number information that obtains more than the expression.
Set up the mapping relations of each distributed virtual resource block logic number and Physical Resource Block logic number, base station and recipient store described mapping relations; When the needs transfer resource, the distributed virtual resource block logic number that the base station will need to shine upon sends to the recipient, and the recipient obtains corresponding physical source distributing information according to described mapping relations.This mapping method because adopted interweave in the group and organize between the means that interweave, so it is big to have solved the expense that the distributed transmission resource mapping of prior art exists, the problem of underaction, and then realized with lower signaling consumption support resource allocation more flexibly and the bigger frequency diversity of acquisition, simultaneously, support the type of service of continuous dispatching better.
Preferably, step can be as follows:
According to the size of DVRB logic number, sequentially equably the DVRB logic number is divided into the S group, and is their serial numbers, every group of equal and opposite in direction among the step S10, be L, if can not divide equally, last remainder divides one group into, is specific group, wherein, L=k * n, (k, n are positive integer);
The matrix of the capable n row of structure k among the step S20, then, the DVRB logic number that each group (except the specific group) is comprised is input in the matrix, and the mode of input is the sequence number according to row, line by line input, all after the input, from this matrix, read the DVRB logic number of input again, the mode of reading is the sequence number according to row, read by row, be input in original group.
Among the step S30 according to the sequence number of time slot, with all groups (except the specific group) according to the ordering of the size of group number after, cyclic shift, shift amount is putting in order of the size of the time slot sequence number group after according to cyclic shift, read the DVRB logic number that each group is comprised, read the DVRB logic number of specific group.Also can exchange in pairs between each group.
DVRB logic number after rearranging among the step S40 is exactly its corresponding physical resource block logic number, like this, has just set up the mapping relations of each distributed virtual resource block logic number and Physical Resource Block logic number.
Preference:
When S=2; Suppose that the quantity of current available PRB is NPRB, then
1. according to the size of DVRB logic number, order uniformly the DVRB logic number is divided into 2 groups, and be their serial numbers, every group of equal and opposite in direction is L, if can not divide equally, last remainder divides one group into, be specific group, wherein, L=k * n, (k, n is a positive integer), n=p * p (p is the quantity of resource group set under the current bandwidth)
Perhaps,
2. construct the matrix of the capable n row of k, then, the DVRB logic number that each group (except the specific group) is comprised is input in the matrix, and the mode of input is the sequence number according to row, line by line input, all after the input, from this matrix, read the DVRB logic number of input again, the mode of reading is the sequence number according to row, read by row, be input in original group.
3. according to the sequence number (#0, #1) of time slot, in first time slot, 2 groups order does not change, and in second time slot, exchanges 2 groups order;
4. according to newly putting in order of organizing, read the DVRB logic number that each group is comprised, at last, read the DVRB logic number of specific group, DVRB logic number after rearranging is exactly its corresponding physical resource block logic number, the mapping relations of each distributed virtual resource block logic number and Physical Resource Block logic number like this, have just been set up.
Corresponding formulas can be expressed as follows:
Suppose that the DVRB logic number is DVRBIndex, its corresponding PRB logic number is PRBIndex, and the time slot index is SIndex (0,1), then,
if(DVRBIndex＜L)
PIndex＝mod(DVRBIndex，k)；
PStart＝floor(DVRBIndex/k)；
PRBIndex＝PIndex×p×p+PStart+SIndex×L；
else
if(DVRBIndex＜2×L)
PIndex＝mod((DVRBIndex-L)，k)；
PStart＝floor((DVRBIndex-L)/k)；
PRBIndex＝PIndex×p×p+PStart+mod((SIndex+1)，2)×L；
else
PRBIndex＝DVRBIndex；
end
end
Preferably, S=4, the quantity of Physical Resource Block is NPRB, then step S10 specifically comprises: n=p * p is set, and p is the quantity of resource group set under the current bandwidth,
Step S30 specifically comprises: in first time slot, described group order does not change, in second time slot, first group and second group of exchange sequence, the 3rd group and the 4th group of exchange sequence, perhaps, first group and the 3rd group of exchange sequence, second group and the 4th group of exchange sequence, perhaps, first group and the 4th group of exchange sequence, second group and the 3rd group of exchange sequence.
Fig. 2 shows the block diagram based on the distributed transmission resource mapping device of ofdm system according to the embodiment of the invention, comprising:
Interleaving block 20 in the group interweaves in being used for according to numbering the logic number of every group DVRB being organized;
Interleaving block 30 between group, interweave between being used for according to the sequence number of time slot a plurality of groups after interweaving in organizing being organized;
Preferably, grouping module 10 is according to the size of the logic number of DVRB, sequentially equably the logic number of DVRB is divided into the S group, and sequentially numbers for the logic number of DVRB, and wherein, every group of size is L, and L=k * n, k and n are positive integer; Interleaving block 20 specifically comprises in the group:
Structural unit is used to construct the matrix of the capable n row of k, and the logic number of the DVRB that each group is comprised is input in the matrix according to the sequence number of row line by line;
Interleave unit is used for pursuing the DVRB logic number that row are read DVRB from this matrix according to the sequence number of row, is input in a plurality of groups.
Preferably, grouping module 10 is according to the size of the logic number of DVRB, sequentially equably the logic number of DVRB is divided into the S group, and sequentially numbers for the logic number of DVRB, and wherein, every group of size is L, and L=k * n, k and n are positive integer; Interleaving block 30 specifically comprises between group:
Row organizes the unit, is used for the sequence number according to time slot, with a plurality of groups of size orderings according to group number;
Shift unit is used for a plurality of groups of cyclic shifts, and shift amount is the size of time slot sequence number; Perhaps, each group pairing exchange in twos;
Sequencing unit is used for sequentially reading the logic number of a plurality of groups DVRB, the logic number of the DVRB that obtains arranging.
Compare with other existing schemes, this mapping device has that signaling consumption is little, and complexity is low, and frequency diversity gain is obvious, better supports the advantages such as type of service of continuous dispatching (persistent scheduling).
FDD (Frequency DivisionDuplex) system with 3GPP LTE (Long Term Evolution) is an example, supposes that bandwidth is 5MHz, and then number of usable subcarriers is 300, contains 14 continuous OFDM symbols in the subframe.With continuous 12 subcarriers, Resource Block RB of continuous 14 OFDM symbolic representations then contains 25 RB, as shown in Figure 3 in a subframe in the present embodiment.Each DVRB is mapped to 2 PRB in the present embodiment, and each LVRB only shines upon to a PRB, and DVRB and LVRB adopt the mode of FDM as shown in Figure 4 multiplexing.
Under LTE 5MHz system bandwidth, suppose that each DVRB can only be to N
d=2 PRB mapping, have 25 DVRB (#0, #1 ..., #24), the quantity of resource group set is 2 under the current bandwidth, i.e. p=2;
n＝p×p＝2×2＝4；
L＝k×n＝3×4＝12；
1. according to the size of DVRB logic number, uniformly the DVRB logic number being divided into of order
2 groups, and be their serial numbers, every group of size is 12, last remainder divides one group into, is specific group;
First group of DVRB logic number that comprises is
{#0，#1，#2，#3，#4，#5，#6，#7，#8，#9，#10，#11}；
Second group of DVRB logic number that comprises is
{#12，#13，#14，#15，#16，#17，#18，#19，#20，#21，#22，#23}；
The DVRB logic number that specific group comprises is { #24};
2. construct the matrix of 3 row, 4 row, then, the DVRB logic number that each group (except the specific group) is comprised is input in the matrix, and the mode of input is the sequence number according to row, line by line input, all after the input, from this matrix, read the DVRB logic number of input again, the mode of reading is the sequence number according to row, read by row, be input in original group.
After interweaving, each is organized clooating sequence and is,
First group of DVRB logic number that comprises is
{#0，#4，#8，#1，#5，#9，#2，#6，#10，#3，#7，#11}；
Second group of DVRB logic number that comprises is
{#12，#16，#20，#13，#17，#21，#14，#18，#22，#15，#19，#23}；
3. according to the sequence number (#0, #1) of time slot, in first time slot, 2 groups order does not change, and in second time slot, exchanges 2 groups order;
4. according to newly putting in order of organizing, read the DVRB logic number that each group is comprised, at last, read the DVRB logic number of specific group.
In first time slot, sorting is:
{#0，#4，#8，#1，#5，#9，#2，#6，#10，#3，#7，#11，#12，#16，#20，#13，#17，#21，
#14，#18，#22，#15，#19，#23，#24}；
In second time slot, sorting is:
{#12，#16，#20，#13，#17，#21，#14，#18，#22，#15，#19,#23，#0，#4，#8，#1，
#5，#9，#2，#6，#10，#3，#7，#11，#24}；
So just set up the mapping relations of each distributed virtual resource block logic number and Physical Resource Block logic number, as follows:
In first time slot,
| DVRB | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 |
| PRB | 0 | 4 | 8 | 1 | 5 | 9 | 2 | 6 | 10 | 3 | 7 | 11 | 12 | 16 | 20 | 13 | 17 | 21 | 14 | 18 | 22 | 15 | 19 | 23 | 24 |
In second time slot,
| DVKB | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 |
| PRB | 12 | 16 | 20 | 13 | 17 | 21 | 14 | 18 | 22 | 15 | 19 | 23 | 0 | 4 | 8 | 1 | 5 | 9 | 2 | 6 | 10 | 3 | 7 | 11 | 24 |
As can be seen from the above description, the present invention is with the modern expense support resource allocation more flexibly of lower letter and obtain bigger frequency diversity, simultaneously, supports the type of service of continuous dispatching better.Mapping method of the foregoing description and device are set up the mapping ruler of each DVRB logic number and PRB logic number in a fixed manner, the recipient just can obtain corresponding physical source distributing information by good by appointment mapping ruler in case definite transmission means is the DVRB logic number that distributed transmission and acquisition are assigned to.Different sub-districts uses different logic number mapping rulers to realize randomizing neighborhood cell interference.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the distributed transmission resource mapping method based on ofdm system is characterized in that, may further comprise the steps:
The DVRB of ofdm system sequentially is divided into a plurality of groups equably according to its logic number;
Interweave in according to described numbering the logic number of every group described DVRB being organized;
According to the sequence number of time slot described a plurality of groups after interweaving in organizing are interweaved between organizing;
With the logic number of the DVRB after interweaving between group logic number as its corresponding physical Resource Block.
2. distributed transmission resource mapping method according to claim 1, it is characterized in that, the DVRB of ofdm system sequentially is divided into a plurality of groups equably according to its logic number specifically to be comprised: according to the size of the logic number of described DVRB, sequentially equably the logic number of described DVRB is divided into the S group, and sequentially number for the logic number of described DVRB, wherein, every group of size is L, L=k * n, k and n are positive integer;
Interweave in according to described numbering the logic number of every group described DVRB being organized and specifically comprise:
The matrix of the capable n of structure k row, the logic number of the described DVRB that each group is comprised is input in the described matrix line by line according to the sequence number of row;
The DVRB logic number of reading described DVRB according to the sequence number of row by row from this matrix is input in described a plurality of groups.
3. distributed transmission resource mapping method according to claim 2, it is characterized in that, S=2, the quantity of described Physical Resource Block is NPRB, then the DVRB of ofdm system sequentially being divided into a plurality of groups equably according to its logic number specifically comprises: n=p * p is set, p is the quantity of resource group set under the current bandwidth
Perhaps,
Perhaps, k=round (NPRB/ (2 * p
2)), perhaps,
4. distributed transmission resource mapping method according to claim 2, it is characterized in that, S=4, the quantity of described Physical Resource Block is NPRB, then the DVRB of ofdm system sequentially being divided into a plurality of groups equably according to its logic number specifically comprises: n=p * p is set, p is the quantity of resource group set under the current bandwidth
Perhaps, k=round (NPRB/ (4 * p
2)), perhaps,
5. distributed transmission resource mapping method according to claim 1 is characterized in that, according to the sequence number of time slot described a plurality of groups after interweaving in organizing is interweaved between organizing and specifically comprises:
According to the sequence number of time slot, with described a plurality of groups of size orderings according to group number;
Described a plurality of groups of cyclic shift, shift amount are the size of time slot sequence number; Perhaps, exchange in pairs between each group;
Sequentially read the logic number of the DVRB in described a plurality of groups, the logic number of the DVRB that obtains arranging.
6. distributed transmission resource mapping method according to claim 5, it is characterized in that, S=2, according to the sequence number of time slot described a plurality of groups after interweaving in organizing are interweaved between organizing and specifically comprise: in first time slot, described group order does not change, in second time slot, exchange described 2 groups order.
7. distributed transmission resource mapping method according to claim 5, it is characterized in that, S=4, according to the sequence number of time slot described a plurality of groups after interweaving in organizing are interweaved between organizing and specifically comprise: in first time slot, described group order does not change, in second time slot, first group and second group of exchange sequence, the 3rd group and the 4th group of exchange sequence, perhaps, first group and the 3rd group of exchange sequence, second group and the 4th group of exchange sequence, perhaps, first group and the 4th group of exchange sequence, second group and the 3rd group of exchange sequence.
8. according to each described distributed transmission resource mapping method of claim 1 to 7, it is characterized in that, the DVRB of ofdm system sequentially be divided into a plurality of groups equably according to its logic number specifically comprise:
If can not divide equally, then the DVRB with last remainder divides one group of specific group into, as last group.
9. distributed transmission resource mapping method according to claim 8 is characterized in that,
Interweave in according to described numbering the logic number of every group described DVRB comprising described feature group being organized, or the logic number of every group described DVRB except that described feature group interweaves in organizing; And
According to the sequence number of time slot described a plurality of groups of described feature group of comprising after interweaving in organizing are interweaved between organizing, or except that described feature group described a plurality of groups interweave between organizing.
10. the distributed transmission resource mapping device based on ofdm system is characterized in that, comprising:
Grouping module is used for the DVRB of ofdm system sequentially is divided into a plurality of groups equably according to its logic number;
Interleaving block in the group interweaves in being used for according to described numbering the logic number of every group described DVRB being organized;
Interleaving block between group is used for according to the sequence number of time slot described a plurality of groups after interweaving in organizing being interweaved between organizing;
Mapping block is used for sequentially reading the logic number of described a plurality of groups DVRB, and the DVRB logic number after obtaining arranging is as the logic number of its corresponding physical Resource Block.
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