CN101154980A - Ascending reference signal resource confirmation method and module - Google Patents
Ascending reference signal resource confirmation method and module Download PDFInfo
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- CN101154980A CN101154980A CNA2006101526912A CN200610152691A CN101154980A CN 101154980 A CN101154980 A CN 101154980A CN A2006101526912 A CNA2006101526912 A CN A2006101526912A CN 200610152691 A CN200610152691 A CN 200610152691A CN 101154980 A CN101154980 A CN 101154980A
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Abstract
The present invention relates to a data transmission technique, especially relates to a method for confirming the upgoing reference signal resource and the module, which is used to settle the problem of reducing precision of the estimated value of the communication channel caused by that the subcarrier wave of the reference signal is not close enough in the existing centralized transmission and the subcarrier wave of the reference signal can not totally corresponds with the subcarrier wave of the corresponding data signal when odd users do distributed transmission. When the technical scheme of the invention is used to confirm the subcarrier wave of the reference signal used by the SB2, offsetting one data signal subcarrier wave distance between the reference signal subcarrier wave used by the SB2 and the reference signal subcarrier wave used by the SB1, namely parallel moving all the subcarrier of the SB2 for a distance of LB subcarrier wave, thereby increasing the density of the reference signal subcarrier wave in the centralized transmission, and causing the reference signal subcarrier wave one-to-one corresponding with the data signal subcarrier wave when odd users do distributed transmission, thereby increasing the precision of the estimated value of the communication channel.
Description
Technical field
The present invention relates to data transmission technology, particularly a kind of ascending reference signal resource is determined method and module.
Background technology
3GPP (Third Generation Partnership Project, third generation partner program) LTE (Long Term Evolution Long Term Evolution) project is the new technology development project of the maximum of 3GPP startup over the past two years, wherein up employing SC-FDMA (Single Carrier Frequency Division MultiplexingAccess, single carrier frequency division is multiplexing) transmission means, signal produces as shown in Figure 1, data symbol is through DFT (Discrete Fourier Transform, discrete Fourier transform (DFT)) carries out the subcarrier mapping after, then through IFFT (Inverse Fast Fourier Transform, quick inverse-Fourier transform), inserting CP (Cyclic Prefix, Cyclic Prefix) back again sends.
Subcarrier mapping has determined which part of frequency spectrum to be used to transmission, by inserting the selection that zero of some realizes frequency spectrum respectively on both sides up and down.Export between each sampled point at DFT and to insert L-1 zero, if L=1 represents localized transmission, when that is to say transmission, the output of DFT is mapped to continuous sub-carriers, if L＞1 o'clock is exactly a distributed transmission, has frequency diversity gain.
Identical subframe structure is all used in centralized and distributed uplink, and each subframe comprises 2 SB (Short Block, short block) and 6 LB (Long Block, long piece), SB is used for the transmission of reference signal, and SB subcarrier minimum interval is 2 times of LB subcarrier spacing, and the TDD system class seemingly.
Reference signal sub-carrier structure such as Fig. 2 in the existing localized transmission, each circle is represented a subcarrier, the data-signal subcarrier that the long piece of each of the first behavior transmission of data signals uses, second row and the third line are two short block SB1 of transmission of reference signals and the reference signal subcarrier that SB2 uses respectively, and subcarrier of each row can be distributed to a plurality of user's travelling carriages uses simultaneously.Wherein, the subcarrier frequency of SB1 and SB2 is identical, and SB1+SB2 is used for representing the data-signal subcarrier of total reference signal correspondence, and the circle of no arrow need carry out interpolation by two adjacent subcarriers and obtain channel estimation value.
Have now at reference signal sub-carrier structure in the distributed transmission shown in Fig. 3 a and Fig. 3 b, if there is the odd number user, for example number of users is 3, the subcarrier that each user distributes uses the arrow logo of different forms, the reference signal of all users on SB2 can not be with the corresponding same subcarrier (subcarrier frequency difference) of corresponding data-signal subcarrier, and number of users is that other odd number situation is similar.
Because the subcarrier spacing of reference signal is 2 times of the data-signal subcarrier spacing, and the subcarrier frequency of SB1 and SB2 is identical, and is therefore always intensive inadequately with reference to channel distortion experienced when localized transmission, causes the channel estimation value precise decreasing; During distributed transmission, under the odd number user situation, reference signal subcarrier and data-signal subcarrier can not be all corresponding, not only cause the channel estimation value precise decreasing, the situation that the reference signal subcarrier has multiple distribution can occur simultaneously, if wherein a kind of distribution situation of the unified use of regulation, will lose the flexibility of scheduling, if do not stipulate, then to tell by signaling which kind of situation receiving terminal has used at transmitting terminal, will increase the expense of signaling like this.
Summary of the invention
The invention provides a kind of ascending reference signal resource and determine method and module, intensive inadequately or can't corresponding corresponding data-signal subcarrier in order to solve existing uplink reference signals subcarrier, cause channel estimation value precise decreasing problem.
For solving the problems of the technologies described above, the invention provides following technical scheme:
A kind of ascending reference signal resource is determined method, comprises the steps:
Determine first's uplink reference signals subcarrier according to the upstream data. signals subcarrier, wherein, the minimum interval of described first uplink reference signals subcarrier is at least two numbers and it is believed that the work song carrier spacing;
Determine second portion uplink reference signals subcarrier according to first's uplink reference signals subcarrier, wherein, skew one number it is believed that the work song carrier spacing between described second portion uplink reference signals subcarrier and the described first uplink reference signals subcarrier.
Wherein: described upstream data. signals subcarrier is continuous.
Wherein, described upstream data. signals subcarrier is discontinuous, and the total number of the travelling carriage of multiplexing described upstream data. signals subcarrier is an odd number.
Wherein, when described upstream data. signals subcarrier discontinuous, and when the total number of the travelling carriage of multiplexing described upstream data. signals subcarrier is even number, all or part of corresponding respectively data-signal subcarrier accordingly of second portion uplink reference signals subcarrier of Que Dinging and first uplink reference signals subcarrier then.
In the described method:
Base station side is distributed the upstream data. signals subcarrier of each travelling carriage according to the total number that inserts travelling carriage, generates the resource allocation indication and the resource allocation indication is broadcast to travelling carriage according to allocation result;
When base station side receives the upward signal of travelling carriage transmission, judge according to issuing the parity that inserts total number of travelling carriage when described resource allocation is indicated whether the total number of travelling carriage of multiplexing described upstream data. signals subcarrier is odd number.
In the described method:
The resource allocation indication that travelling carriage issues according to base station side determines to distribute to the upstream data. signals subcarrier of oneself, and judge the total number of travelling carriage of multiplexing described upstream data. signals subcarrier for the interval of adjacent two the upstream data. signals subcarriers of oneself according to base station assigns, if the described odd number data-signal subcarrier spacing that is spaced apart, then described total number is an odd number, if described is even number data-signal subcarrier spacing, then described total number is an even number.
The present invention also provides a kind of ascending resource determination module, comprising:
Second determining unit is determined first's uplink reference signals subcarrier according to the upstream data. signals subcarrier, and wherein, the minimum interval of described first uplink reference signals subcarrier is at least two numbers and it is believed that the work song carrier spacing;
The 3rd determining unit, determine second portion uplink reference signals subcarrier according to described first uplink reference signals subcarrier, wherein, skew one number it is believed that the work song carrier spacing between described second portion uplink reference signals subcarrier and the described first uplink reference signals subcarrier.
First determining unit is used for determining the upstream data. signals subcarrier.
First judging unit is judged whether the upstream data. signals subcarrier is continuous, and first judged result is sent to the 3rd determining unit;
Second judging unit, be connected between described first judging unit and the 3rd determining unit, if the judged result of first judging unit is that the upstream data. signals subcarrier is discontinuous, judge again then whether the adjacent two data channel distortion experienced that same travelling carriage distributes is the odd-multiple of a data subcarrier spacing at interval, and corresponding second judged result is sent to the 3rd determining unit;
Described the 3rd determining unit receives that first judged result of first judging unit output is that the upstream data. signals subcarrier is continuous, first judged result of perhaps receiving described first judging unit output is that the upstream data. signals subcarrier is discontinuous, when second judged result of receiving second judging unit output simultaneously is odd-multiple, then is offset a number between the second portion uplink reference signals subcarrier of Que Dinging and the first's uplink reference signals subcarrier and it is believed that the work song carrier spacing;
Described the 3rd determining unit receives that first judged result of described first judging unit output is that the upstream data. signals subcarrier is discontinuous, when second judged result of receiving second judging unit output simultaneously is even-multiple, the second portion uplink reference signals subcarrier of determining according to first's uplink reference signals subcarrier and all or part of corresponding respectively data-signal subcarrier accordingly of first's uplink reference signals subcarrier then.
Described first determining unit, second determining unit and the 3rd determining unit independently be provided with respectively, wherein any two merge and be provided with or the three merges setting.
Beneficial effect of the present invention is as follows:
The present invention is when localized transmission and the transmission of odd number user distribution formula, make that skew one number it is believed that the work song carrier spacing between the reference signal subcarrier that reference signal subcarrier that SB2 uses and SB1 use, be about to LB subcarrier spacing of all subcarrier integral translations of SB2, thereby the density of reference signal subcarrier when having improved localized transmission, and reference signal subcarrier and data-signal subcarrier are corresponding fully one by one when making the transmission of odd number user distribution formula, thereby have improved the precision of channel estimation value.
Description of drawings
Fig. 1 is the SC-FDMA transmission structure;
Fig. 2 is a localized transmission reference signal sub-carrier structure schematic diagram;
Fig. 3 a, Fig. 3 b are respectively localized transmission and total number of users reference signal sub-carrier structure schematic diagram when being odd number, wherein, distribute to the subcarrier of different user with the arrow logo of different forms;
Fig. 4 determines the main schematic flow sheet of method for ascending reference signal resource of the present invention;
Fig. 5 is for realizing the primary structure schematic diagram of a kind of ascending resource determination module of the present invention;
Fig. 6 is after using ascending reference signal resource of the present invention to determine method under the data set Chinese style transmission means, the reference signal structure schematic diagram;
Fig. 7 is after using ascending reference signal resource of the present invention to determine method under the odd number user data distributed transmission mode, the reference signal structure schematic diagram;
Fig. 8～Figure 11 is the simulation performance contrast schematic diagram between technical solution of the present invention and the prior art scheme.
Embodiment
The present invention is directed in the existing LTE uplink reference signals structure, reference signal density is lower during localized transmission, odd number user distribution formula when transmission reference signal subcarrier and data-signal subcarrier can not be fully and the problem of corresponding data channel distortion experienced correspondence, when localized transmission and the transmission of odd number user distribution formula, skew one number it is believed that the work song carrier spacing between the reference signal subcarrier that reference signal subcarrier that SB2 is used and SB1 use, be about to LB subcarrier spacing of all subcarrier integral translations of SB2, thereby the density of reference signal subcarrier when having improved localized transmission, reference signal subcarrier and data-signal subcarrier are corresponding one by one when making the transmission of odd number user distribution formula.
For realizing above-mentioned technical conceive, the invention provides a kind of ascending reference signal resource and determine method, wherein first's uplink reference signals subcarrier is meant the subcarrier that SB1 uses, second portion uplink reference signals subcarrier is meant the subcarrier that SB2 uses, consult shown in Figure 4ly, specifically comprise the steps:
Step S401, determine the upstream data. signals subcarrier;
Step S402, judge whether the upstream data. signals subcarrier is continuous, if then change step S405 over to; Otherwise continue step S403;
Whether step S403, the interval that is judged as adjacent two upstream data. signals subcarriers that same travelling carriage distributes are the odd-multiple that a number it is believed that the work song carrier spacing, if then change step S405 over to; Otherwise continue step S404;
For base station side, at first, base station side is distributed the upstream data. signals subcarrier of each travelling carriage according to the total number that inserts travelling carriage, generates the resource allocation indication and the resource allocation indication is broadcast to travelling carriage according to allocation result; Then, when base station side receives the upward signal of travelling carriage transmission, judge according to issuing the parity that inserts total number of travelling carriage when described resource allocation is indicated whether the total number of travelling carriage of multiplexing described upstream data. signals subcarrier is odd number.
For mobile station side, the resource allocation indication that each travelling carriage issues according to base station side determines to distribute to the upstream data. signals subcarrier of oneself, and judge the total number of travelling carriage of multiplexing described upstream data. signals subcarrier for the interval of adjacent two the upstream data. signals subcarriers of oneself according to base station assigns, if the described odd number data-signal subcarrier spacing that is spaced apart, then described total number is an odd number, if described is even number data-signal subcarrier spacing, then described total number is an even number.
Step S404, determine first's uplink reference signals subcarrier and second portion reference signal subcarrier, second portion uplink reference signals subcarrier and all or part of corresponding respectively data-signal subcarrier accordingly of first's uplink reference signals subcarrier respectively;
When even number user distribution formula is transmitted, can be identical with prior art, second portion uplink reference signals subcarrier and all or part of corresponding respectively corresponding data-signal subcarrier of first's uplink reference signals subcarrier.
Here, first's uplink reference signals subcarrier is corresponding with the data-signal subcarrier of each travelling carriage, and the minimum interval of first's uplink reference signals subcarrier and second portion reference signal subcarrier all is at least two numbers and it is believed that the work song carrier spacing.
Step S405, determine wherein to be offset first's uplink reference signals subcarrier and second portion reference signal subcarrier a number between second portion uplink reference signals subcarrier and the described first uplink reference signals subcarrier and to it is believed that the work song carrier spacing respectively.
When localized transmission and the transmission of odd number user distribution formula, unlike the prior art, data subcarrier spacing of skew between first's uplink reference signals subcarrier and the second portion reference signal subcarrier, the data subcarrier that has been about to the integral translation of second portion reference signal subcarrier.
Equally, first's uplink reference signals subcarrier is corresponding with the data-signal subcarrier of each travelling carriage, and the minimum interval of first's uplink reference signals subcarrier and second portion reference signal subcarrier all is at least two numbers and it is believed that the work song carrier spacing.
Certainly step S403 and step S402 merging is carried out, and determines second portion reference signal subcarrier according to final judged result then.
So far, for mobile station side, travelling carriage has been finished ascending reference signal resource of the present invention and has been determined, travelling carriage generates upward signal and sends to the base station then, wherein: user data is mapped on the corresponding data-signal subcarrier that distributes, and reference signal is mapped on the corresponding first's reference signal subcarrier and/or second portion reference signal subcarrier that distributes.
For base station side, when receiving the upward signal of each travelling carriage, can determine this travelling carriage corresponding second portion reference signal subcarrier according to said method.
As shown in Figure 5, corresponding, the invention provides a kind of ascending resource determination module 500, comprising:
First judging unit 501 is judged whether the upstream data. signals subcarrier is continuous, and first judged result is sent to the 3rd determining unit 505;
First determining unit 503 is used for determining the data-signal subcarrier of base station assigns to oneself;
Second determining unit 504 is used for determining first's uplink reference signals subcarrier that wherein, the minimum interval of described first uplink reference signals subcarrier is at least two numbers and it is believed that the work song carrier spacing;
The 3rd determining unit 505 is used for determining second portion uplink reference signals subcarrier according to first's uplink reference signals subcarrier that the minimum interval of second portion uplink reference signals subcarrier is at least two numbers equally and it is believed that the work song carrier spacing, wherein:
First judged result of receiving 501 outputs of first judging unit is a consecutive hours, and skew one number it is believed that the work song carrier spacing between definite second portion uplink reference signals subcarrier and the first's uplink reference signals subcarrier.
First judged result of receiving 501 outputs of first judging unit is discontinuous, when second judged result of receiving the output of second judging unit 502 simultaneously is odd-multiple, determine that still being offset a number between this second portion uplink reference signals subcarrier and the first's uplink reference signals subcarrier it is believed that the work song carrier spacing;
First judged result of receiving 501 outputs of first judging unit is discontinuous, when second judged result of receiving the output of second judging unit 502 simultaneously is even-multiple, this definite second portion uplink reference signals subcarrier and all or part of corresponding respectively data-signal subcarrier accordingly of first's uplink reference signals subcarrier.
Wherein, first determining unit 503, second determining unit 504 and the 3rd determining unit 505 can be distinguished independent setting, can any two merging be provided with, also can the three merge setting.
As shown in Figure 6, during for localized transmission, use the reference signal structure schematic diagram of said method of the present invention, wherein be offset a number between the reference signal subcarrier that the reference signal subcarrier of SB2 use and SB1 use and it is believed that the work song carrier spacing, comparison diagram 2 as seen, the density of reference signal is improved, thereby has improved the channel estimation value precision.
As shown in Figure 7, when being 3 users' distributed transmission, use the reference signal structure schematic diagram of said method of the present invention, the subcarrier that each user distributes uses the arrow logo of different forms, wherein be offset a number between the reference signal subcarrier that the reference signal subcarrier of SB2 use and SB1 use and it is believed that the work song carrier spacing, comparison diagram 3a or Fig. 3 b are as seen, the subcarrier of same user's reference signal can be corresponding fully one by one with the data-signal subcarrier, thereby improved the channel estimation value precision, all fours when number of users is other odd number.
The beneficial effect of technical solution of the present invention can utilize Fig. 8, Fig. 9, Figure 10 and simulation performance curve shown in Figure 11 to prove, the translational speed of 3 and 30 expression user travelling carriages among the figure, 3 be 3 kilometers/per hour, 30 be 30 kilometers/per hour, old represents to use the reference signal structure of prior art, and new is for using the reference signal structure of technical solution of the present invention.Abscissa is represented signal to noise ratio (snr), and ordinate is represented the root mean square error (RMSE) of channel estimation value.Used channel is two kinds of channel models that define among the 3GPP TS45.005, and TU represents 6 footpath models of typical urban environment, and HT represents 6 footpath models of many mountain regions shape environment.Channel estimating adopts the linear interpolation method on frequency domain and the time domain.
Wherein, Fig. 8 is the performance comparison of localized transmission under the TU channel; Fig. 9 is the performance comparison of localized transmission under the HT channel; Figure 10 is that odd number user distribution formula is transmitted in the performance comparison under the TU channel; Figure 11 is that odd number user distribution formula is transmitted in the performance comparison under the HT channel.As seen after using technical solution of the present invention, the accuracy of channel estimating all is improved.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. an ascending reference signal resource is determined method, it is characterized in that, comprises the steps:
Determine first's uplink reference signals subcarrier according to the upstream data. signals subcarrier, wherein, the minimum interval of described first uplink reference signals subcarrier is at least two numbers and it is believed that the work song carrier spacing;
Determine second portion uplink reference signals subcarrier according to first's uplink reference signals subcarrier, wherein, skew one number it is believed that the work song carrier spacing between described second portion uplink reference signals subcarrier and the described first uplink reference signals subcarrier.
2. the method for claim 1 is characterized in that, described upstream data. signals subcarrier is continuous.
3. method as claimed in claim 2 is characterized in that, described upstream data. signals subcarrier is discontinuous, and the total number of the travelling carriage of multiplexing described upstream data. signals subcarrier is an odd number.
4. method as claimed in claim 3, it is characterized in that, when described upstream data. signals subcarrier discontinuous, and when the total number of the travelling carriage of multiplexing described upstream data. signals subcarrier is even number, all or part of corresponding respectively data-signal subcarrier accordingly of second portion uplink reference signals subcarrier of Que Dinging and first uplink reference signals subcarrier then.
5. as claim 3 or 4 described methods, it is characterized in that, in the described method:
Base station side is distributed the upstream data. signals subcarrier of each travelling carriage according to the total number that inserts travelling carriage, generates the resource allocation indication and the resource allocation indication is broadcast to each travelling carriage according to allocation result;
When base station side receives the upward signal of travelling carriage transmission, judge according to issuing the parity that inserts total number of travelling carriage when described resource allocation is indicated whether the total number of travelling carriage of multiplexing described upstream data. signals subcarrier is odd number.
6. method as claimed in claim 5 is characterized in that, in the described method:
The resource allocation indication that travelling carriage issues according to base station side determines to distribute to the upstream data. signals subcarrier of oneself, and judge the total number of travelling carriage of multiplexing described upstream data. signals subcarrier for the interval of adjacent two the upstream data. signals subcarriers of oneself according to base station assigns, if the described odd number data-signal subcarrier spacing that is spaced apart, then described total number is an odd number, if described is even number data-signal subcarrier spacing, then described total number is an even number.
7. ascending resource determination module comprises:
Second determining unit is determined first's uplink reference signals subcarrier according to the upstream data. signals subcarrier, and wherein, the minimum interval of described first uplink reference signals subcarrier is at least two numbers and it is believed that the work song carrier spacing;
It is characterized in that described module also comprises:
The 3rd determining unit, determine second portion uplink reference signals subcarrier according to described first uplink reference signals subcarrier, wherein, skew one number it is believed that the work song carrier spacing between described second portion uplink reference signals subcarrier and the described first uplink reference signals subcarrier.
8. module as claimed in claim 7 is characterized in that, described module also comprises: first determining unit is used for determining the upstream data. signals subcarrier.
9. module as claimed in claim 8 is characterized in that, described module also comprises:
First judging unit is judged whether the upstream data. signals subcarrier is continuous, and first judged result is sent to the 3rd determining unit;
Second judging unit, be connected between described first judging unit and the 3rd determining unit, if the judged result of first judging unit is that the upstream data. signals subcarrier is discontinuous, judge again then whether the adjacent two data channel distortion experienced that same travelling carriage distributes is the odd-multiple of a data subcarrier spacing at interval, and corresponding second judged result is sent to the 3rd determining unit;
Described the 3rd determining unit receives that first judged result of first judging unit output is that the upstream data. signals subcarrier is continuous, first judged result of perhaps receiving described first judging unit output is that the upstream data. signals subcarrier is discontinuous, when second judged result of receiving second judging unit output simultaneously is odd-multiple, then is offset a number between the second portion uplink reference signals subcarrier of Que Dinging and the first's uplink reference signals subcarrier and it is believed that the work song carrier spacing;
Described the 3rd determining unit receives that first judged result of described first judging unit output is that the upstream data. signals subcarrier is discontinuous, when second judged result of receiving second judging unit output simultaneously is even-multiple, the second portion uplink reference signals subcarrier of determining according to first's uplink reference signals subcarrier and all or part of corresponding respectively data-signal subcarrier accordingly of first's uplink reference signals subcarrier then.
10. module as claimed in claim 9 is characterized in that, described first determining unit, second determining unit and the 3rd determining unit independently be provided with respectively, wherein any two merge and be provided with or the three merges setting.
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| CN102598819A (en) * | 2009-10-28 | 2012-07-18 | 夏普株式会社 | Wireless communication system, base station device, mobile station device, method for controlling wireless communication system, control program for base station device, and control program for mobile station device |
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| CN102469050A (en) * | 2011-06-30 | 2012-05-23 | 重庆重邮信科通信技术有限公司 | Chanel estimating method in long-term evolution system based on specific reference signal of terminal |
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