CN103427965A - PHICH sending method - Google Patents
PHICH sending method Download PDFInfo
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- CN103427965A CN103427965A CN2012101669131A CN201210166913A CN103427965A CN 103427965 A CN103427965 A CN 103427965A CN 2012101669131 A CN2012101669131 A CN 2012101669131A CN 201210166913 A CN201210166913 A CN 201210166913A CN 103427965 A CN103427965 A CN 103427965A
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Abstract
The invention relates to a PHICH sending method. The method comprises the following steps: mapping PHICH data to a resource to obtain a time-frequency resource corresponding to the PHICH data; during the PHICH data resource mapping, carrying out layer mapping processing on group numbers and deviation in the group of the PHICH data so as to obtain a data caching address corresponding to the PHICH; during the PHICH data resource mapping, carrying out processing on the PHICH data in a bit domain so as to obtain processed data corresponding to the PHICH; and storing the processed data to the data caching address corresponding to the processed data and outputting the data caching address and the time-frequency resource. When the method provided by the embodiment of the invention is applied, resource consumption can be reduced and the whole calculating speed is accelerated.
Description
Technical field
The present invention relates to communication technical field, more specifically, relate to the sending method of a kind of physical hybrid automatic repeat request indicator channel (PHICH).
Background technology
PHICH is one of descending transmitting channel of long evolving system (LTE), the HARQ feedback information of PHICH carrying reverse link traffic channel, transmission reliability is high, processing time is enough short, support that the multi-user sends multiplexing transmission, and inter-user interference and presence of intercell interference are low, so the PHICH process of transmitting is different with other down channels.
Transmission flow schematic diagram referring to PHICH in prior art in accompanying drawing 1.Specifically comprise following six steps: data-interface receives data, modulating data, spread spectrum and scrambled data, layer mapping and precoding, the moulding of group signal and resource mapping.Particularly, in order to support multiuser multiplexing, send, need to carry out spread processing to each PHICH, the PHICH after every eight orthogonal intersection spread spectrums is divided into one group.In order to reduce presence of intercell interference, the PHICH data after adopting the specific signal scrambling technique in community to spread spectrum are carried out scrambling.And the regulation in the employing agreement is carried out layer mapping and precoding.PHICH after every group of eight spectrum-spreading and scrambling is organized to the signal forming processes, form PHICH and send symbol data, wait for being mapped to sending on running time-frequency resource.
In prior art, send PHICH and complete at symbol field, realization is simple and structure is distinct.Because symbol field is the complex data of binary data through generating after modulation treatment, the real part of antenna data and imaginary part all want 16bit to mean, at transmission group signal formative stage, comprise more arithmetic operator.Therefore the resource consumption that symbol field brings is larger.Existing PHICH sends to be needed to process successively by step, and the computational process of this sending method postpones longer so.
Summary of the invention
The embodiment of the present invention proposes the sending method of a kind of PHICH, can reduce resource consumption, accelerates overall calculation speed.
The technical scheme of the embodiment of the present invention is as follows:
A kind of sending method of physical hybrid automatic repeat request indicator channel, the method comprises:
Physical hybrid automatic repeat request indicator channel PHICH data-mapping is obtained to running time-frequency resource corresponding to PHICH data on resource;
In the time of the mapping of PHICH data resource, the group number of PHICH data is carried out to layer with the group bias internal and shine upon processing, obtain the data buffer storage address that PHICH is corresponding;
PHICH data resource mapping time, process the PHICH data and obtain data after the processing corresponding with PHICH in bit field;
After described processing, data are stored in the data buffer storage address corresponding with data after described processing, export described data buffer storage address and described running time-frequency resource.
Described process the PHICH data obtain the processing corresponding with PHICH in bit field after data comprise:
Successively the PHICH data are carried out to scrambling, spread spectrum, precoding and the moulding of group signal in bit field, obtain data after the processing corresponding with PHICH.
Described scrambling comprises:
If scramble sequence c(i)=0, the PHICH data real part of symbol after phase-shift keying BPSK modulation is constant, and the imaginary part of symbol is constant;
If scramble sequence c(i)=1, the PHICH data real part of symbol after the BPSK modulation is negated, and the imaginary part of symbol is negated.
Described spread spectrum comprises: the PHICH data after scrambling are multiplied by frequency expansion sequence.
PHICH data after described scrambling are multiplied by frequency expansion sequence and comprise:
If the element in frequency expansion sequence is+1, the PHICH data real part imaginary part after scrambling is constant;
If the element in frequency expansion sequence is-1, the equal negate of PHICH data real part imaginary part after scrambling;
If the element in frequency expansion sequence is+j, the PHICH data real part imaginary part switch after scrambling, and the real part negate after exchange;
If the element in frequency expansion sequence is-j, the PHICH data real part imaginary part switch after scrambling, and the imaginary part negate after exchange.
Described group of signal moulding comprises: the PHICH data in every group after precoding are added up, obtain data after the processing corresponding with PHICH.
Described the PHICH data-mapping is comprised to obtaining running time-frequency resource corresponding to PHICH data on resource:
Described the PHICH data are obtained to running time-frequency resource corresponding to PHICH data according to precalculated list mapping on resource.
Described calculating in advance comprises: determine resource grains subgroup REG used according to the resource mapping parameter, by REG used, determine that available REG obtains described precalculated list.
Can find out from technique scheme, in embodiments of the present invention, the PHICH data-mapping be obtained to running time-frequency resource corresponding to PHICH data on resource; In the time of the mapping of PHICH data resource, the group number of PHICH data is carried out to layer with the group bias internal and shine upon processing, obtain the data buffer storage address that PHICH is corresponding; PHICH data resource mapping time, process the PHICH data and obtain data after the processing corresponding with PHICH in bit field.Above-mentioned three step parallel processings, must accelerate whole computational speed.Finally, data after described processing are stored in the data buffer storage address corresponding with the data after described processing, export described data buffer storage address and described running time-frequency resource.Because technical scheme of the present invention is to carry out in bit field, than symbol field of the prior art, only relate to 0 and 1 in bit field, therefore in bit field, can reduce the consumption of resource.
The accompanying drawing explanation
Fig. 1 is the schematic flow sheet that in prior art, PHICH sends;
The transmission flow schematic diagram that Fig. 2 is embodiment of the present invention PHICH;
The transmission schematic diagram that Fig. 3 is embodiment of the present invention PHICH.
Embodiment
For making the purpose, technical solutions and advantages of the present invention express clearlyer, below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
In embodiments of the present invention, by the resource mapping of PHICH data, the layer of group number and group bias internal shines upon and processes three step parallel processings of PHICH data, has accelerated so whole computational speed.In addition, process the PHICH data and carry out in bit field, calculating process is simple than symbol field, has therefore reduced the consumption of resource.
Are transmission flow schematic diagrames of PHICH of the present invention referring to accompanying drawing 2, specifically comprise the following steps:
The frequency domain resource that PHICH is corresponding and time-domain resource are for PHICH.Running time-frequency resource corresponding to output PHICH is for using in subsequent process.
In the time of step 202, the mapping of PHICH data resource, the group number of PHICH data is carried out to layer with the group bias internal and shine upon processing, obtain the data buffer storage address that PHICH is corresponding.
Need to determine concrete data buffer storage address for the data in PHICH.Can carry out layer mapping processing to group number and the group bias internal of PHICH data, obtain the data buffer storage address that PHICH is corresponding.
According to the LTE physical layer protocol, every group of PHICH comprises 8 PHICH data.And each PHICH data finally generates 12 data after spectrum-spreading and scrambling.The sequence number 0 ~ 11 of these 12 data is the group bias internal.For the PHICH data of input, sequence number in the corresponding corresponding group number of each data and group, with the position of identification data.When data are carried out to the layering processing, also be accompanied by the layering of sequence number in group number and group.Such as a string data flow 1,2,3,4,5 and 6 is divided into to two-layer data flow 1,3,5 and 2,4,6.
The data of PHICH layer mapping are not actual antenna datas, but the data buffer storage address, the address formed by group signal and group bias internal.
In the time of the mapping of step 203, PHICH data resource, process the PHICH data and obtain data after the processing corresponding with PHICH in bit field.
The PHICH data are carried out to scrambling to be comprised: if scramble sequence c(i)=0, mean to send the symbol real part imaginary part of symbol constant; If scramble sequence c(i)=1, the expression real part imaginary part of symbol is negated.
Due to the PHICH data, through the BPSK modulation, the binary data of input is the result after modulation, and the mould value of its real part and imaginary data only has a kind of (radical sign 1/2nd), and its sign is also identical.So can only need 0/1 two states to show the sign of data, put aside the mould value.The result after using " 00 " and " 11 " to mean modulation, for example 00: first ' 0 ', mean the real part data, and symbol is for just; Second ' 0 ', mean imaginary data, and symbol is for just.The computing that relates to the mould value is put in follow-up step and processes, and its treatment step is prior art.
The PHICH data of scrambling are carried out to spread spectrum to be comprised: the PHICH data after scrambling are multiplied by frequency expansion sequence.Being about to the real part imaginary part sign that the spread spectrum process is equivalent to the PHICH data negates or exchanges real imaginary part position.Frequency expansion sequence w (i)=1 means that the real imaginary part of symbol of the PHICH data after scrambling is constant; W (i)=-1, mean that the real imaginary part sign of PHICH data after scrambling is negated; W (i)=+ j, mean PHICH data imaginary part sign after the scrambling real imaginary part of the rear exchange position of negating; W (i)=-j, mean PHICH data real part sign after the scrambling real imaginary part of the rear exchange position of negating.
Numerical value in frequency expansion sequence is+1 ,-1 ,+j, and-j, a plural number multiplies each other with it, is only change sign or exchange real imaginary part.So while realizing without concrete calculating.
Bit field data after spread processing are carried out to precoding processing according to agreement, obtain the precoding result of bit field.According to the bit field PHICH data after precoding processing, the up-down counter of every group of PHICH is set respectively, organized the signal forming processes.Data after precoding processing are binary, and 0 means positive number, and 1 means negative.The cumulative process of plural number, be equivalent to bit-level and add one and subtract an operation.The moulding of group signal is exactly 8 PHICH data accumulations, and 8 groups every group 12 data are carried out the cumulative of the unit of classifying as, finally export 12 complex datas.
After step 204, described processing, data buffer storage, to the data buffer storage address corresponding with data after described processing, is exported described data buffer storage address and described running time-frequency resource.
Obtain running time-frequency resource in step 201, obtain the data buffer storage address in step 202, the data buffer storage after being processed in step 203, so just can be by data buffer storage after processing to the data buffer storage address corresponding with processing rear data.
By the PHICH data-mapping, to obtaining running time-frequency resource corresponding to PHICH data on resource, can be that the parameter in resource mapping is determined resource grains subgroup used according to prior art in the present invention, and then according to the resource grains subgroup (REG) that can be used for PHICH in running time-frequency resource, finally that the PHICH data-mapping is upper to actual REG, thus determine running time-frequency resource corresponding to PHICH data.Certainly, said process can also be calculated to corresponding list in advance according to the parameter of resource mapping.Carry out resource mapping according to precalculated list like this, just can save a large amount of computing times, accelerate whole computational speed.
Particularly, according to following step calculations list in advance.
(1) calculate REG used
Some parameters relate to complex calculations (division is asked mould etc.), can consume a large amount of calculation resources.Precompute REG used corresponding to parameter according to fixing parameter, saved real-time calculation resources.Concrete computing is prior art.
(2) available REG
The REG used determined by parameter, be not actual frequency domain position, can not directly use, and need to consider that the REG of Physical Control Format Indicator Channel (PCFICH) takies situation, skips occupied REG.PCFICH is the another kind of down control channel of resource mapping priority higher than PHICH.
Need to be judged available REG position before mapping.Consuming the more time can affect continuous water operation.Therefore well in advance judgement, calculate REG available in PHICH directly to store in order in RAM, follow-up, while carrying out the PHICH mapping, can read continuously available REG from RAM.
Referring to accompanying drawing 3, are transmission schematic diagrames of PHICH, the data of exporting from data-interface are when being processed, and the PHICH data are carried out the running time-frequency resource mapping; Group number and group bias internal carry out layer mapping.And the data buffer storage after processing is in corresponding data buffer storage address, and export described data buffer storage address and described running time-frequency resource.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. the sending method of a physical hybrid automatic repeat request indicator channel, is characterized in that, the method comprises:
Physical hybrid automatic repeat request indicator channel PHICH data-mapping is obtained to running time-frequency resource corresponding to PHICH data on resource;
In the time of the mapping of PHICH data resource, the group number of PHICH data is carried out to layer with the group bias internal and shine upon processing, obtain the data buffer storage address that PHICH is corresponding;
PHICH data resource mapping time, process the PHICH data and obtain data after the processing corresponding with PHICH in bit field;
After described processing, data are stored in the data buffer storage address corresponding with data after described processing, export described data buffer storage address and described running time-frequency resource.
2. the sending method of physical hybrid automatic repeat request indicator channel according to claim 1, is characterized in that, described process the PHICH data obtain the processing corresponding with PHICH in bit field after data comprise:
Successively the PHICH data are carried out to scrambling, spread spectrum, precoding and the moulding of group signal in bit field, obtain data after the processing corresponding with PHICH.
3. the sending method of physical hybrid automatic repeat request indicator channel according to claim 2, is characterized in that, described scrambling comprises:
If scramble sequence c(i)=0, the PHICH data real part of symbol after phase-shift keying BPSK modulation is constant, and the imaginary part of symbol is constant;
If scramble sequence c(i)=1, the PHICH data real part of symbol after the BPSK modulation is negated, and the imaginary part of symbol is negated.
4. the sending method of physical hybrid automatic repeat request indicator channel according to claim 2, is characterized in that, described spread spectrum comprises: the PHICH data after scrambling are multiplied by frequency expansion sequence.
5. the sending method of physical hybrid automatic repeat request indicator channel according to claim 4, is characterized in that, the PHICH data after described scrambling are multiplied by frequency expansion sequence and comprise:
If the element in frequency expansion sequence is+1, the PHICH data real part imaginary part after scrambling is constant;
If the element in frequency expansion sequence is-1, the equal negate of PHICH data real part imaginary part after scrambling;
If the element in frequency expansion sequence is+j, the PHICH data real part imaginary part switch after scrambling, and the real part negate after exchange;
If the element in frequency expansion sequence is-j, the PHICH data real part imaginary part switch after scrambling, and the imaginary part negate after exchange.
6. the sending method of physical hybrid automatic repeat request indicator channel according to claim 2, is characterized in that, described group of signal moulding comprises: the PHICH data in every group after precoding are added up, obtain data after the processing corresponding with PHICH.
7. the sending method of physical hybrid automatic repeat request indicator channel according to claim 1, is characterized in that, described the PHICH data-mapping comprised to obtaining running time-frequency resource corresponding to PHICH data on resource:
Described the PHICH data are obtained to running time-frequency resource corresponding to PHICH data according to precalculated list mapping on resource.
8. the sending method of physical hybrid automatic repeat request indicator channel according to claim 7, it is characterized in that, described calculating in advance comprises: determine resource grains subgroup REG used according to the resource mapping parameter, by REG used, determine that available REG obtains described precalculated list.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104506474A (en) * | 2014-12-10 | 2015-04-08 | 北京星河亮点技术股份有限公司 | PHICH (Physical HARQ (Hybrid Automatic Repeat Request) Indicator Channel) processing method and device |
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| CN101895993A (en) * | 2009-05-21 | 2010-11-24 | 中兴通讯股份有限公司 | Channel multiplexing and mapping method and device |
| CN101938336A (en) * | 2010-08-13 | 2011-01-05 | 中兴通讯股份有限公司 | Method and system for indicating and determining uplink transmission mode |
| CN102215571A (en) * | 2010-04-01 | 2011-10-12 | 上海贝尔股份有限公司 | Method and device for allocating resources for physical hybrid automatic repeat request indicator channel |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895993A (en) * | 2009-05-21 | 2010-11-24 | 中兴通讯股份有限公司 | Channel multiplexing and mapping method and device |
| CN102215571A (en) * | 2010-04-01 | 2011-10-12 | 上海贝尔股份有限公司 | Method and device for allocating resources for physical hybrid automatic repeat request indicator channel |
| CN101938336A (en) * | 2010-08-13 | 2011-01-05 | 中兴通讯股份有限公司 | Method and system for indicating and determining uplink transmission mode |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104506474A (en) * | 2014-12-10 | 2015-04-08 | 北京星河亮点技术股份有限公司 | PHICH (Physical HARQ (Hybrid Automatic Repeat Request) Indicator Channel) processing method and device |
| CN104506474B (en) * | 2014-12-10 | 2018-03-13 | 北京星河亮点技术股份有限公司 | PHICH channel processing methods and device |
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