CN103379050A - Communication processing method and device - Google Patents
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Abstract
The invention discloses a communication processing method and device. The communication processing method is applied to a mobile communication system carrying out channel information feedback based on a differential feedback method element by element, and comprises the following steps of obtaining a current value of a codebook transformation parameter, determining a second codebook different from a first codebook currently used by the mobile communication system according to the current value of the codebook transformation parameter, and carrying out differential feedback processing element by element by utilizing the second codebook, wherein within a period of time starting from the time when differential feedback processing is carried out element by element by utilizing the second codebook, the average quantization error generated when a true residual error obtained from a receiving end is quantified by utilizing the second codebook is smaller than the average quantization error generated when the true residual error obtained from the receiving end is quantified by utilizing the first codebook. The communication processing method and device can improve the handling capacity of the system.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly a kind of communication processing method and device.
Background technology
Mobile communication technology is in unprecedented fast-developing period.Along with the rapid growth of mobile subscriber in the global range and popularizing of portable computing equipment, the professional shared proportion of data service and broadband internet is increasing, and future mobile communication system need to be realized higher data rate and larger power system capacity.But along with the extensive use of various wireless communication technologys, it is very crowded that wireless channel becomes, and available frequency spectrum resource day hastens towards saturation.In order to solve the contradiction between the surge of frequency spectrum resource shortage and traffic carrying capacity, future mobile communication system need to adopt the advanced communication technology, realizes high spectrum efficiency.
As the most important achievement in research of recent two decades wireless communication field, the MIMO adaptive technique is to improve the effective ways of the spectrum efficiency of wireless communication system.The MIMO technology has obtained the additional space degree of freedom by at transmitter and many antennas of receiver configuration, can significantly improve channel capacity; And technology for self-adaptively transmitting can fully excavate the Radio Resource that MIMO provides, and the validity and reliability of Effective Raise communication is simplified simultaneously sending/receiving and processed complexity.At present, the MIMO adaptive technique has become the physical-layer techniques of current system of broadband wireless communication main flow.
The precondition of implementing the MIMO Adaptive Transmission is the state information that system's transmitting terminal need to obtain the current wireless channel.But in Frequency Division Duplexing (FDD), transmitting terminal can not obtain necessary channel condition information, therefore can't finish the self adaptation adjustment of sending mode.For this reason, need to set up one by the low speed feedback channel of receiving terminal to transmitting terminal, with feedback of channel information to transmitting terminal.Key issue in the feedback of channel information technology is to optimize feedback scheme, obtains higher feedback accuracy with lower feedback overhead, thereby effectively improves the transmission quality of forward link.
As the support technology of MIMO Adaptive Transmission, the feedback of channel information technology has received the common concern of academia and industrial quarters.A lot of significant achievements in research are reported out at present, and wherein the influential feedback method that is based on precoding codebook is described as follows.
As shown in Figure 1, consider that user terminal is to the situation of base station feedback channel information.Before system works, design in advance a precoding codebook, wherein comprise K code word W
1, W
2..., W
K, each code word is an alternative pre-coding matrix.
Base station and user terminal are all preserved this code book.In the practical work process, user terminal is estimated current channel matrix H according to the pilot tone of forward link.According to channel estimation results, user terminal is found out a code word of mating most with current channel according to certain criterion from code book, as pre-coding matrix.
After selecting code word, user terminal feeds back to the base station with the code word sequence number of this code word by feedback channel.This code word just can be found out according to the code word sequence number of feedback in the base station from code book, and it is carried out subsequent treatment as pre-coding matrix.
Feedback method based on precoding codebook is the channel information feedback method of current popular, by the standard of current main-stream such as 3GPP LTE/LTE-A, the employings such as 802.16e.Based on the feedback method of precoding codebook have simple in structure, strong robustness, the advantage such as complexity is low, feedback quantity is little.But its feedback accuracy is lower, the code book design complexities high and feedback information is unfavorable for subsequent treatment, therefore only is fit to point-to-point Single User MIMO transmission mode.Along with the continuous appearance of the new technologies such as multiuser MIMO and CoMP, this limitation is also more and more obvious.Developing more effective feedback of channel information technology has become the key issue of needing solution badly of the current wireless communications field.
In order to improve the shortcoming based on the feedback method of precoding codebook, the researcher conducts in-depth research.For the problem of many aspects, obtained respectively corresponding solution.At first, carry out transmission processing in order to make things convenient for transmitting terminal, directly feedback channel matrixes, rather than the pre-coding matrix of processing.Secondly, in order to reduce the based on feedback link complexity, particularly feed back the design complexities of code book, the vector quantization problem of channel matrix is split into scalar quantization problem to each element of channel matrix.At last, in order to improve feedback accuracy, control simultaneously feedback overhead, introduce the method for differential feedback, the slowly varying behavior that takes full advantage of wireless channel improves feedback accuracy.These solutions are merged, formed the element differential feedback method of pursuing of channel information, its basic principle as shown in Figure 2.
As shown in Figure 2, when receiving terminal feeds back channel information, not directly channel value to be quantized, but first with the channel h (t) of current time and the value of feedback of previous moment
Subtract each other the difference that obtains
Be called residual signals.That actual feedback is exactly residual signals Δ (t) in the differential feedback.Because channel becomes slowly, the dynamic range of residual error is very little, so feedback error is also little.After transmitting terminal (based on feedback link receiving terminal) is received the residual signals of feedback, revise the value of feedback of previous moment with it
Finally obtain the channel information of current time.
Pursue the slowly varying behavior that element differential feedback method is utilized wireless channel, under the scene that quasistatic to middle low speed moves, can obtain high feedback accuracy.Simultaneously, because channel matrix is pursued processing of element, avoided the code book design problem of higher-dimension in the vector quantization.But the code book that adopts during residual quantization must mate with the statistical property of residual error, not only otherwise can not obtain performance gain, may cause larger feedback error on the contrary.In the mobile communication system of reality, user's translational speed constantly changes, and the speed degree that channel parameter changes also changes thereupon, so become when the statistical property of residual signals also is.Adopt a fixing code book can not adapt to all situations, cause the larger performance loss of performance.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of communication processing method and device, improves the performance of mobile communication system.
To achieve these goals, the embodiment of the invention provides a kind of communication processing method, is used for one based on the mobile communication system of carrying out feedback of channel information by element differential feedback method, and described communication processing method comprises:
Obtain the currency of code book transformation parameter;
Determine one second code book according to the currency of code book transformation parameter, described the second code book is different from the first code book of the current use of described mobile communication system;
Utilizing the second code book to pursue the element differential feedback processes;
Wherein, from utilizing the second code book to pursue in the certain hour section that moment that the element differential feedback processes begins the average quantization error the when average quantization error the when true residue that adopts described the second code book docking receiving end to obtain quantizes quantizes less than the true residue that adopts described the first code book that receiving terminal is obtained.
Above-mentioned communication processing method, wherein, described code book transformation parameter is the translational speed of receiving terminal, described currency according to the code book transformation parameter determines that one second code book specifically comprises:
Obtain current the first translational speed for codebook selecting of receiving terminal;
From a plurality of code books of pre-save, select the interval corresponding code book of translational speed at described the first translational speed place as described the second code book.
Above-mentioned communication processing method, wherein, described the first translational speed is current real-time translational speed, or till the current time the average translational speed in the predetermined amount of time.
Above-mentioned communication processing method wherein, also comprises:
Notify presently used code book to Correspondent Node, so that communicating pair can use identical code book.
Above-mentioned communication processing method, wherein, described currency according to the code book transformation parameter determines that one second code book specifically comprises:
Obtain the currency of code word feedback interval;
From a plurality of code books of described pre-save, the interval corresponding code book of code word feedback interval at the currency place of selection code word feedback interval is as described the second code book.
Above-mentioned communication processing method, wherein, described code book transformation parameter is the statistical information of the reaction true residue amplitude in the predetermined amount of time, described the second code book for according to described statistical information to the code word scaled down in the first code book or the code book that obtains after amplifying.
To achieve these goals, the embodiment of the invention also provides a kind of communication processing apparatus, is used for one based on the mobile communication system of carrying out feedback of channel information by element differential feedback method, and described communication processing apparatus comprises:
Acquisition module is for the currency that obtains the code book transformation parameter;
Codebook determining module is used for determining one second code book according to the currency of code book transformation parameter that described the second code book is different from the first code book of the current use of described mobile communication system;
Feedback processing modules is used for utilizing the second code book to pursue the element differential feedback and processes;
Wherein, from utilizing the second code book to pursue in the certain hour section that moment that the element differential feedback processes begins the average quantization error the when average quantization error the when true residue that adopts described the second code book docking receiving end to obtain quantizes quantizes less than the true residue that adopts described the first code book that receiving terminal is obtained.
Above-mentioned communication processing apparatus, wherein, described code book transformation parameter is the translational speed of receiving terminal, described codebook determining module specifically comprises:
The speed acquiring unit is used for obtaining current the first translational speed for codebook selecting of receiving terminal;
The first selected cell is used for a plurality of code books from pre-save, selects the interval corresponding code book of translational speed at described the first translational speed place as described the second code book.
Above-mentioned communication processing apparatus wherein, also comprises:
Notification module is used for notifying presently used code book to Correspondent Node, so that communicating pair can use identical code book.
Above-mentioned communication processing apparatus, wherein, described codebook determining module specifically comprises:
The interval acquiring unit is for the currency that obtains the code word feedback interval;
The second selected cell is used for a plurality of code books from described pre-save, and the interval corresponding code book of code word feedback interval at the currency place of selection code word feedback interval is as described the second code book.
Above-mentioned communication processing apparatus, wherein, described code book transformation parameter is the statistical information of the reaction true residue amplitude in the predetermined amount of time, described the second code book for according to described statistical information to the code word scaled down in the first code book or the code book that obtains after amplifying.
The embodiment of the invention has following beneficial effect at least:
Utilize the method for the embodiment of the invention, can be so that more true residue be dwindled with the distance of corresponding immediate code word, then the residual error that reconstructs of transmitting terminal and the average quantization error of true residue also can dwindle, so have improved the throughput of system.
Description of drawings
Fig. 1 is the schematic diagram of the feedback method based on precoding codebook of the prior art;
Fig. 2 is the schematic diagram by element differential feedback method of the prior art;
Fig. 3 is the schematic flow sheet of the communication processing method of the embodiment of the invention;
Fig. 4 A is the distribution schematic diagram that utilizes the front true residue of communication processing method of the embodiment of the invention;
Fig. 4 B is the distribution schematic diagram that utilizes true residue behind the communication processing method of the embodiment of the invention;
Fig. 4 C is the schematic diagram of the position relationship between explanation true residue and the code word on the impact of transmitting terminal reconstruct residual error;
Fig. 5 is the idiographic flow schematic diagram that utilizes the method for the embodiment of the invention.
Fig. 6 is the structural representation of the communication processing apparatus of the embodiment of the invention.
Embodiment
In the communication processing method of the embodiment of the invention and the device, adjust the structure of code book according to the statistics of existing feedback information, make it to adapt with current channel circumstance, in the situation that does not increase feedback overhead, improve the performance of mobile communication system.
The communication processing method of the embodiment of the invention is used for one based on the mobile communication system of carrying out feedback of channel information by element differential feedback method, and as shown in Figure 3, described communication processing method comprises:
Wherein, from utilizing the second code book to pursue in the certain hour section that moment that the element differential feedback processes begins the average quantization error the when average quantization error the when true residue that adopts described the second code book docking receiving end to obtain quantizes quantizes less than the true residue that adopts described the first code book that receiving terminal is obtained.
Take the situation shown in Fig. 4 A as example, suppose and utilize fixed codebook, then true residue (the little empty circles among the figure) more is distributed in outside the coverage of code book, like this, a large amount of code words that all are quantified as the outer ring away from the true residue of outmost turns code word, can cause the average quantization error of residual error that transmitting terminal reconstructs and true residue larger, cause throughput of system to descend, this will be elaborated in the back.
Shown in Fig. 4 A, wherein, average quantization error is (delta1+delta2+...+deltan)/n.
And utilize the method for the embodiment of the invention, shown in Fig. 4 B, then more true residue is dwindled with the distance of corresponding immediate code word, and then the residual error that reconstructs of transmitting terminal and the average quantization error of true residue also can dwindle, so can improve the throughput of system.
Mention before, pursue the slowly varying behavior that element differential feedback method is utilized wireless channel, under the scene that quasistatic to middle low speed moves, can obtain high feedback accuracy.That is to say, in or the scene that speed is sometimes fast and sometimes slow higher when speed, can cause the throughput of system to descend.
Cause above-mentioned reason to be because in the situation that code book is fixed, when the code word in residual signals and the code book is distant, situation shown in Fig. 4 C, the code word of receiving terminal feedback is code word A, then transmitting terminal can utilize code word A to obtain residual error after receiving the code word ID of feedback
This residual error
(t) had very large difference with real residual delta, therefore can cause transmitting terminal to communicate processing by the correct channel information of reconstruct, and then can cause throughput to descend.
And above-mentioned residual error
(t) has very large difference with real residual delta, from forming on the reason, be that code book only is complementary with certain receiving terminal translational speed, when the receiving terminal translational speed exceeds this scope, code book no longer is complementary with the receiving terminal translational speed, then can cause above-mentioned situation.
And on the form of expression, residual error
And when the diversity ratio between the real residual delta (t) is larger, must be that the gap between the amplitude of all code words in the amplitude of real residual error and the code book is all large especially.
And during from another form of expression, the amplitude that can show as the code word of receiving terminal feedback presents extreme phenomenon, and perhaps feedback is the code word of amplitude maximum, and perhaps feedback is the code word of amplitude minimum, if and the feedback be the code word of amplitude median, then can not cause residual error
And the king-sized situation of difference between the real residual delta (t).
According to above understanding, in the specific embodiment of the invention, this code book transformation parameter can be various parameter, and it is also corresponding different to utilize the code book transformation parameter to obtain second code book different from the first code book, is described in detail as follows.
＜implementation one 〉
In implementation one, described code book transformation parameter is the translational speed of receiving terminal.
Under this mode, a plurality of code books of pre-save, and it is interval to record translational speed corresponding to each code book.
Certainly, suitable code book corresponding to each translational speed can obtain by the reality test.
Determine that according to the currency of code book transformation parameter one second code book specifically comprises:
Obtain current the first translational speed for codebook selecting of receiving terminal;
From a plurality of code books of described pre-save, select the interval corresponding code book of translational speed at described the first translational speed place as described the second code book.
In the specific embodiment of the invention, this first translational speed can be current real-time translational speed, also can be the average translational speed in the predetermined amount of time till the current time, and certainly, rear a kind of mode is more feasible in actual applications.
In specific embodiments of the invention, can carry out at set intervals the code book conversion and judge that this time interval can arrange as required, but unsuitable too short.
Illustrate as follows to aforesaid way with real-time translational speed.
Suppose pre-save code book X1, X2, X3, X4 ..., correspond respectively to following speed interval:
0≤V＜3Km/h；
3Km/h≤V＜8Km/h；
8Km/h≤V＜15Km/h；
15Km/h≤V＜30Km/h；
……
Suppose that the current speed of receiving terminal is 6Km/h, then can select code book X2 to pursue the element differential feedback and process, when the current speed of receiving terminal is 22Km/h, then can select code book X4 to pursue the element differential feedback and process ...
Should be understood that, above-mentionedly only illustrate that the quantity of code book, corresponding speed interval etc. can arrange as required, do not do concrete restriction at this.
In implementation one, since code book corresponding to each speed interval be in advance by experiment or actual drive test obtain corresponding with this speed interval, be adapted at the code book that uses under this speed, and seek this code book by the speed that the reality test obtains, so that the actual code book that uses can be complementary with the channel circumstance of reality, can reduce residual error with respect to the technical scheme of using fixed codebook
And the mean difference between the real residual delta (t) also just communicates processing so that transmitting terminal can reconstruct the channel information that more approaches with actual channel information, has improved throughput of system.
In the above-mentioned example, this the second code book is the code book of pre-save, but in follow-up embodiment, this second code book is not pre-save, but the code book to obtaining after the ongoing code word scaled down of the code book of pre-save or the amplification, and this code book transformation parameter is the statistical information of the reaction true residue amplitude in the predetermined amount of time, described the second code book for according to described statistical information to the code word scaled down in the first code book or the code book that obtains after amplifying.
The below is as follows to its illustrated in greater detail.
＜implementation two 〉
In implementation two, described code book transformation parameter is the average amplitude of the true residue in the predetermined amount of time till the current time.
Under this mode, obtain second code book different from the first code book according to a code book transformation parameter and specifically comprise:
Get access to the average amplitude of the true residue in the predetermined amount of time till the current time;
Judge the code word in described average amplitude and described the first code book amplitude peak difference whether greater than the first default thresholding (such as 40% of amplitude peak, it can arrange as required, as, think that some then can arrange larger slowly in switching, otherwise can arrange smaller), perhaps the difference of the minimum radius of the code word in described the first code book and described average amplitude whether greater than the second default thresholding (such as 40% of minimum radius, it can arrange as required, as, think that some then can arrange larger slowly in switching, otherwise can arrange smaller), obtain one first judged result;
The difference of amplitude peak of indicating the code word in described average amplitude and described the first code book in described the first judged result is during greater than default the first thresholding, equal proportion is amplified the amplitude of all code words in described the first code book, obtain the second code book, the difference of indicating the minimum radius of the code word in described the first code book and described average amplitude in described the first judged result is during greater than default the second thresholding, the amplitude of all code words in described the first code book of scaled down, obtain described the second code book, otherwise it is constant to keep the first code book.
In implementation two, when the difference of the amplitude peak of the average amplitude of the true residue in the predetermined amount of time till current time and the code word in described the first code book during greater than default the first thresholding, show that the true residue that larger proportion is arranged drops on outside the coverage of code book, shown in Fig. 4 A, namely there is the true residue of larger proportion to drop on outside the shadow region.The coverage that can only enlarge code book this moment could reduce this residual error
And the difference between the real residual delta (t) therefore needs equal proportion to amplify the amplitude of all code words in the code book.
Certainly, in specific embodiments of the invention, when the difference of the amplitude peak of the average amplitude of the true residue in the predetermined amount of time till current time and the code word in described the first code book during greater than default the first thresholding, then should be poor larger, the ratio of then amplifying is larger.
Opposite, when the difference of the minimum radius of the code word in the first code book and described average amplitude during greater than the second thresholding of presetting, show that the code book coverage is excessive, namely there is the true residue of larger proportion to drop within the most inboard circle.The coverage that can only dwindle code book this moment could reduce this residual error
Therefore and the difference between the real residual delta (t) needs the amplitude of all code words in the scaled down code book.
Certainly, in specific embodiments of the invention, when the difference of the minimum radius of the code word in the first code book and described average amplitude during greater than default the second thresholding, then should be poor larger, the ratio of then dwindling is larger.
When either way no, show that then the first current code book is proper.
In the above-mentioned implementation, the first default thresholding is 40% of code word amplitude peak, the second default thresholding is that 40% of code word minimum radius only illustrates, and should default the first thresholding and second thresholding can also represent by the code word average amplitude, such as unified 45%, 50% or 55% etc. of the code word average amplitude that is set to.
＜implementation three 〉
In implementation three, described code book transformation parameter is the first numerical value and the second value in the predetermined amount of time till the current time, wherein:
The first numerical value is the ratio of the quantity of all true residue in the quantity of the first true residue and the predetermined amount of time;
Second value is the ratio of the quantity of all true residue in the quantity of the second true residue and the predetermined amount of time;
The difference of the amplitude peak of the code word in the amplitude of the first true residue and described the first code book greater than the 3rd default thresholding (as the amplitude peak of the code word in the first code book 30%);
The difference of the minimum radius of the code word in described the first code book and the amplitude of described the second true residue greater than the 4th default thresholding (as the minimum radius of the code word in the first code book 30%);
Under this mode, obtain second code book different from the first code book according to a code book transformation parameter and specifically comprise:
Obtain described the first numerical value and second value;
Whether judge described the first numerical value greater than the 5th default thresholding, perhaps whether described second value obtains one second judged result greater than the 6th default thresholding;
When described the second judged result is indicated described the first numerical value greater than default the 5th thresholding, equal proportion is amplified the amplitude of all code words in described the first code book, obtain the second code book, when described the second judged result is indicated described second value greater than default the 6th thresholding, the amplitude of all code words in described the first code book of scaled down, obtain described the second code book, otherwise it is constant to keep the first code book.
In implementation three, when the first numerical value greater than the 5th default thresholding (such as 80%, certainly can also be other numerical value, such as 60%, 70% or 90% etc.) time, show that the code book coverage is too small, there is the true residue of larger proportion to drop on outside the coverage of code book, shown in Fig. 4 A, namely has the true residue of larger proportion to drop on outside the shadow region.The coverage that can only enlarge code book this moment could reduce this residual error
And the difference between the real residual delta (t) therefore needs equal proportion to amplify the amplitude of all code words in the code book.
Certainly, in specific embodiments of the invention, when the first numerical value during greater than default the 5th thresholding, then this first numerical value is larger, and the ratio of then amplifying is larger.
Opposite, when second value during greater than the 6th default thresholding (such as 80%, can also be other numerical value certainly, as 60%, 70% or 90% etc.), show that the code book coverage is excessive, namely have the true residue of larger proportion to drop within the most inboard circle.The coverage that can only dwindle code book this moment could reduce this residual error
Therefore and the difference between the real residual delta (t) needs the amplitude of all code words in the scaled down code book.
Certainly, in specific embodiments of the invention, when second value during greater than default the 6th thresholding, then this second value is larger, and the ratio of then dwindling is larger.
In the above-mentioned implementation, the 3rd default thresholding is 30% of code word amplitude peak, the 4th default thresholding is that 30% of code word minimum radius only illustrates, and should default the 3rd thresholding and the 4th thresholding also can be other set-up mode, such as unified 50% etc. of the code word average amplitude that is set to.
＜implementation four 〉
In implementation four, described code book transformation parameter is third value and the 4th numerical value in the predetermined amount of time till the current time, wherein:
Third value is the ratio of the quantity of all true residue in the quantity of the 3rd true residue and the predetermined amount of time;
The 4th numerical value is the ratio of the quantity of all true residue in the quantity of the 4th true residue and the predetermined amount of time;
The 3rd true residue is in the predetermined amount of time, after quantizing corresponding to the true residue of the code word of the amplitude maximum in described the first code book;
The 4th true residue is in the predetermined amount of time, after quantizing corresponding to the true residue of the code word of the amplitude minimum in described the first code book;
Under this mode, obtain second code book different from the first code book according to a code book transformation parameter and specifically comprise:
Obtain described third value and the 4th numerical value;
Whether judge described third value greater than the 7th default thresholding, perhaps whether described the 4th numerical value obtains one three judged result less than the 8th default thresholding;
When described the 3rd judged result is indicated described third value greater than default the 7th thresholding, equal proportion is amplified the amplitude of all code words in described the first code book, obtain the second code book, when described the 3rd judged result is indicated described the 4th numerical value greater than default the 8th thresholding, the amplitude of all code words in described the first code book of scaled down, obtain described the second code book, otherwise it is constant to keep the first code book.
In implementation four, when third value greater than the 7th default thresholding (such as 80%, certainly can also be other numerical value, such as 60%, 70% or 90% etc.) time, show that the code book coverage is too small, there is the true residue of larger proportion to drop on outside the coverage of code book, as shown in Figure 4, namely has the true residue of larger proportion to drop on outside the shadow region.The coverage that can only enlarge code book this moment could reduce this residual error
And the difference between the real residual delta (t) therefore needs equal proportion to amplify the amplitude of all code words in the code book.
Certainly, in specific embodiments of the invention, when third value during greater than default the 7th thresholding, then this third value is larger, and the ratio of then amplifying is larger.
Opposite, when described the 4th numerical value during greater than the 8th default thresholding (such as 80%, can also be other numerical value certainly, as 60%, 70% or 90% etc.), show that the code book coverage is excessive, namely have the true residue of larger proportion to drop within the most inboard circle.The coverage that can only dwindle code book this moment could reduce this residual error
Therefore and the difference between the real residual delta (t) needs the amplitude of all code words in the scaled down code book.
Certainly, in specific embodiments of the invention, when described the 4th numerical value during greater than default the 8th thresholding, then the 4th numerical value is larger, and the ratio of then amplifying is larger.
This should be noted that above-mentioned to illustrating of thresholding only be for convenient understand carry out for example, but can adjust as required in the reality, do not elaborate at this.
In the above-mentioned implementation two, three and four, described the second code book is the code book to obtaining after the code word scaled down in the first code book or the amplification.
In a word, above all implementations all are for so that in the average coverage that is distributed in code book of true residue, so that the residual error that transmitting terminal recovers is more close to true residue (namely so that average quantization error is less), also with regard to carrying out transmission processing so that transmitting terminal can access more accurate channel information, improve the throughput of system.
And the code book adjustment mode of the embodiment of the invention is not limited to above code book transformation parameter and concrete code book is adjusted mode, can also be the feedback interval of code word such as the code book transformation parameter, and brief description is as follows.
Such as a plurality of code books of pre-save, and it is interval to record code word feedback interval corresponding to each code book.
Certainly, the interval corresponding suitable code book of each code word feedback interval can obtain by the reality test.
Obtaining second code book different from the first code book according to a code book transformation parameter specifically comprises:
Obtain the currency of code word feedback interval;
From a plurality of code books of described pre-save, the interval corresponding code book of code word feedback interval at the currency place of selection code word feedback interval is as described the second code book.
Certainly, current code word feedback interval can be last code word feedback and the time interval of code word between feeding back last time, also can be the code word feedback interval mean value in the predetermined amount of time till current time.
The method of the embodiment of the invention both had been applicable to portable terminal to the base station feedback channel information, also was applicable to the base station to the portable terminal feedback channel information.
Should be understood that, when code book is invariable, work can be carried out based on same code book in portable terminal and base station, and in the method for the embodiment of the invention, this code book no longer is unalterable, but the at any time variation of channel, network condition etc. and changing, therefore, in order to guarantee that communicating pair (portable terminal and base station) can use identical code book, the method for the embodiment of the invention also comprises:
Notify presently used code book to Correspondent Node, so that communicating pair can use identical code book.
In specific embodiments of the invention, notify presently used code book to carry out in the following way to Correspondent Node:
1, periodically carries out; Or
2, when changing, carries out code book.
And the content of notice can be the radius of current code book, the various parameters that can determine code book such as ID of current code book.
And specifically how to notify, can adopt any mode between existing portable terminal and the base station, no further details to be given herein.
Method to the embodiment of the invention is elaborated the below to the base station feedback channel information as example take portable terminal.
Suppose that sending ending equipment has N
aIndividual antenna, receiving device has N
bIndividual antenna, then the receiving device channel information that need to feed back is a N
bRow N
aThe channel matrix of row.
Adopt the tupe by element in the embodiment of the invention, with the N of channel matrix
b* N
aThe processing that individual element walks abreast respectively., in the UE side to the method for h (t) feedback as shown in Figure 5, comprise the steps: in t value constantly with certain element of h (t) expression channel matrix
Calculate the true residue signal
Carry out residual quantization, at code book CB={c
1..., c
KIn find out and the immediate code word of true residue, that is:
After the quantification, corresponding code word sequence number is delivered to feedback channel.
After finishing aforesaid operations, carry out to upgrade caching, i.e. the operation adopted of UE anolog base station obtains that code word that the base station utilizes feedback obtains
Then the value that records in the current cache is added
Rear renewal buffer memory;
Then carry out code book and upgrade operation, the various execution modes of mentioning before utilizing this moment carry out code book to be upgraded, and namely equal proportion zooms in or out the amplitude of all code words, carries out as follows:
CB
new＝z
CB×CB＝{z
CBc
1，...，z
CBc
K}
And code book update coefficients z
CBComputational methods illustrate as follows.
Set in advance smoothingtime T, and design one group of scaling factor z
1..., z
k, the scaling factor is corresponding one by one with the code word in the code book.Each feedback all will be selected a code word and feed back, and just can determine a scaling factor accordingly, be designated as z (t).According to current time t and front T scaling factor z (t) constantly ..., z (t-T) calculates the code book update coefficients, and computational methods can be selected wherein a kind of in following three kinds:
Arithmetic average: z
CB=z (t)+...+z (t-T) }/(T+1)
Geometric average:
And the operation of base station side is as follows:
The residual quantization value is determined after receiving the code word sequence number of feedback in the base station.According to the code word sequence number search key that feeds back originally, obtain the residual quantization value
Upgrade buffer memory, according to
With the previous moment channel feedback value of buffer memory, calculate the channel feedback value of current time
And utilize currency
Upgrade buffer memory, and offer other modules of base station as channel information.
Carry out code book and upgrade operation, this operation is identical with UE, does not describe at this.
The base station can reconfigure a code book radius for the user by high-level signaling, carries out above-mentioned renewal operation again.
The embodiment of the invention also provides a kind of communication processing apparatus, is used for one based on the mobile communication system of carrying out feedback of channel information by element differential feedback method, and as shown in Figure 6, described communication processing apparatus comprises:
Acquisition module is for the currency that obtains the code book transformation parameter;
Codebook determining module is used for determining one second code book according to the currency of code book transformation parameter that described the second code book is different from the first code book of the current use of described mobile communication system;
Feedback processing modules is used for utilizing the second code book to pursue the element differential feedback and processes;
Wherein, from utilizing the second code book to pursue in the certain hour section that moment that the element differential feedback processes begins the average quantization error the when average quantization error the when true residue that adopts described the second code book docking receiving end to obtain quantizes quantizes less than the true residue that adopts described the first code book that receiving terminal is obtained.
Described code book transformation parameter can be the translational speed for receiving terminal, and described codebook determining module specifically comprises in this case:
The speed acquiring unit is used for obtaining current the first translational speed for codebook selecting of receiving terminal in second moment;
The first selected cell is used for a plurality of code books from pre-save, selects the interval corresponding code book of translational speed at described the first translational speed place as described the second code book.
Described the first translational speed is current real-time translational speed, or till the current time the average translational speed in the predetermined amount of time.
In the above-mentioned example, this the second code book is the code book of pre-save, but in follow-up implementation, this second code book is not pre-save, but the code book to obtaining after the ongoing code word scaled down of the code book of pre-save or the amplification, and this code book transformation parameter is the statistical information of the reaction true residue amplitude in the predetermined amount of time, described the second code book for according to described statistical information to the code word scaled down in the first code book or the code book that obtains after amplifying.
Described code book transformation parameter can be the average amplitude of the true residue in the predetermined amount of time till the current time; Described codebook determining module specifically comprises in this case:
The average amplitude acquiring unit is used for obtaining described average amplitude in second moment;
The first judging unit, be used for judging that whether the difference of amplitude peak of code word of described average amplitude and described the first code book is greater than the first thresholding of presetting, perhaps whether the difference of the minimum radius of the code word in described the first code book and described average amplitude obtains one first judged result greater than the second default thresholding;
The first code book generation unit, the difference of amplitude peak of code word that is used for indicating described average amplitude and described the first code book in described the first judged result is during greater than the first thresholding of presetting, equal proportion is amplified the amplitude of all code words in described the first code book, obtain the second code book, the difference of indicating the minimum radius of the code word in described the first code book and described average amplitude in described the first judged result is during greater than default the second thresholding, the amplitude of all code words in described the first code book of scaled down obtains the second code book.
Described code book transformation parameter can be the first numerical value and the second value in the predetermined amount of time till the current time, wherein:
The first numerical value is the ratio of the quantity of all true residue in the quantity of the first true residue and the predetermined amount of time; The difference of the amplitude peak of the code word in the amplitude of described the first true residue and described the first code book is greater than the 3rd default thresholding;
Second value is the ratio of the quantity of all true residue in the quantity of the second true residue and the predetermined amount of time; The difference of the minimum radius of the code word in described the first code book and the amplitude of described the second true residue is greater than the 4th default thresholding;
Described codebook determining module specifically comprises:
The first numerical value acquiring unit is used for obtaining described the first numerical value and second value in second moment;
Whether the second judging unit is used for judging described the first numerical value greater than the 5th default thresholding, and perhaps whether described second value obtains one second judged result greater than the 6th default thresholding;
The second code book generation unit, be used for when described the second judged result is indicated described the first numerical value greater than default the 5th thresholding, equal proportion is amplified the amplitude of all code words in described the first code book, obtain the second code book, when described the second judged result is indicated described second value greater than default the 6th thresholding, the amplitude of all code words in described the first code book of scaled down obtains the second code book.
Described code book transformation parameter can be third value and the 4th numerical value in the predetermined amount of time till the current time, wherein:
Third value is the ratio of the quantity of all true residue in the quantity of the 3rd true residue and the predetermined amount of time; The 3rd true residue is in the predetermined amount of time, after quantizing corresponding to the true residue of the code word of the amplitude maximum in described the first code book;
The 4th numerical value is the ratio of the quantity of all true residue in the quantity of the 4th true residue and the predetermined amount of time; The 4th true residue is in the predetermined amount of time, after quantizing corresponding to the true residue of the code word of the amplitude minimum in described the first code book;
Described codebook determining module specifically comprises:
The second value acquiring unit is used for obtaining described third value and the 4th numerical value in second moment;
Whether the 3rd judging unit is used for judging described third value greater than the 7th default thresholding, and perhaps whether described the 4th numerical value obtains one three judged result less than the 8th default thresholding;
This generation unit of third yard, be used for when described the 3rd judged result is indicated described third value greater than default the 7th thresholding, equal proportion is amplified the amplitude of all code words in described the first code book, obtain the second code book, when described the second judged result is indicated described the 4th numerical value greater than default the 8th thresholding, the amplitude of all code words in described the first code book of scaled down obtains the second code book.
Above-mentioned communication processing apparatus wherein, also comprises: notification module is used for notifying presently used code book to Correspondent Node, so that communicating pair can use identical code book.
Many functional parts described in the specification of the embodiment of the invention all are called as module/unit, in order to emphasize more especially the independence of its implementation.
In the embodiment of the invention, module/unit can be realized with software, in order to carried out by various types of processors.For instance, the executable code module of a sign can comprise one or more physics or the logical block of computer instruction, and for instance, it can be built as object, process or function.However, the executable code of institute's identification module need not to be physically located in together, but can comprise the different instruction on being stored in the coordination not, when combining on these command logics, and its composition module and realize the regulation purpose of this module.
In fact, executable code module can be individual instructions or many instructions, and even can be distributed on a plurality of different code segments, be distributed in the middle of the distinct program, and cross over a plurality of memory devices and distribute.Similarly, operating data can be identified in module, and can realize and be organized in the data structure of any suitable type according to any suitable form.Described operating data can be used as the individual data collection and is collected, and perhaps can be distributed on the diverse location (to be included on the different storage device), and can only be present on system or the network as electronic signal at least in part.
When module can utilize software to realize, consider the level of existing hardware technique, so can be with the module of software realization, in the situation of not considering cost, those skilled in the art can build corresponding hardware circuit and realize corresponding function, and described hardware circuit comprises conventional ultra-large integrated (VLSI) circuit or gate array and the existing semiconductor such as logic chip, transistor or other discrete element.Module can also be used programmable hardware device, realizations such as field programmable gate array, programmable logic array, programmable logic device.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a communication processing method is used for one based on the mobile communication system of carrying out feedback of channel information by element differential feedback method, and described communication processing method comprises:
Obtain the currency of code book transformation parameter;
Determine one second code book according to the currency of code book transformation parameter, described the second code book is different from the first code book of the current use of described mobile communication system;
Utilizing the second code book to pursue the element differential feedback processes;
Wherein, from utilizing the second code book to pursue in the certain hour section that moment that the element differential feedback processes begins the average quantization error the when average quantization error the when true residue that adopts described the second code book docking receiving end to obtain quantizes quantizes less than the true residue that adopts described the first code book that receiving terminal is obtained.
2. communication processing method according to claim 1 is characterized in that, described code book transformation parameter is the translational speed of receiving terminal, and described currency according to the code book transformation parameter determines that one second code book specifically comprises:
Obtain current the first translational speed for codebook selecting of receiving terminal;
From a plurality of code books of pre-save, select the interval corresponding code book of translational speed at described the first translational speed place as described the second code book.
3. communication processing method according to claim 2 is characterized in that, described the first translational speed is current real-time translational speed, or till the current time the average translational speed in the predetermined amount of time.
4. communication processing method according to claim 1 is characterized in that, also comprises:
Notify presently used code book to Correspondent Node, so that communicating pair can use identical code book.
5. communication processing method according to claim 1 is characterized in that, described currency according to the code book transformation parameter determines that one second code book specifically comprises:
Obtain the currency of code word feedback interval;
From a plurality of code books of described pre-save, the interval corresponding code book of code word feedback interval at the currency place of selection code word feedback interval is as described the second code book.
6. communication processing method according to claim 1, it is characterized in that, described code book transformation parameter is the statistical information of the reaction true residue amplitude in the predetermined amount of time, described the second code book for according to described statistical information to the code word scaled down in the first code book or the code book that obtains after amplifying.
7. a communication processing apparatus is used for one based on the mobile communication system of carrying out feedback of channel information by element differential feedback method, and described communication processing apparatus comprises:
Acquisition module is for the currency that obtains the code book transformation parameter;
Codebook determining module is used for determining one second code book according to the currency of code book transformation parameter that described the second code book is different from the first code book of the current use of described mobile communication system;
Feedback processing modules is used for utilizing the second code book to pursue the element differential feedback and processes;
Wherein, from utilizing the second code book to pursue in the certain hour section that moment that the element differential feedback processes begins the average quantization error the when average quantization error the when true residue that adopts described the second code book docking receiving end to obtain quantizes quantizes less than the true residue that adopts described the first code book that receiving terminal is obtained.
8. communication processing apparatus according to claim 7 is characterized in that, described code book transformation parameter is the translational speed of receiving terminal, and described codebook determining module specifically comprises:
The speed acquiring unit is used for obtaining current the first translational speed for codebook selecting of receiving terminal;
The first selected cell is used for a plurality of code books from pre-save, selects the interval corresponding code book of translational speed at described the first translational speed place as described the second code book.
9. communication processing apparatus according to claim 7 is characterized in that, also comprises:
Notification module is used for notifying presently used code book to Correspondent Node, so that communicating pair can use identical code book.
10. communication processing apparatus according to claim 7 is characterized in that, described codebook determining module specifically comprises:
The interval acquiring unit is for the currency that obtains the code word feedback interval;
The second selected cell is used for a plurality of code books from described pre-save, and the interval corresponding code book of code word feedback interval at the currency place of selection code word feedback interval is as described the second code book.
11. communication processing apparatus according to claim 7, it is characterized in that, described code book transformation parameter is the statistical information of the reaction true residue amplitude in the predetermined amount of time, described the second code book for according to described statistical information to the code word scaled down in the first code book or the code book that obtains after amplifying.
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