CN101577574B - Control signaling sending method - Google Patents
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Abstract
The invention relates to a control signaling sending method comprising the following steps: an overriding codebook subset and a paired codebook subset are set for each codebook in a codebook set; a codebook back fed by a target user is received by a node B, if it is determined that a codebook needs to be reselected in accordance with the received codebook, an overriding codebook subset of the received codebook is determined, and a weighted codebook is selected from the received codebook; the paired codebook subset of the selected weighted codebook is determined by the node B, a paired user isdetermined for the paired codebook in the determined paired codebook subset, and the codebook of the paired user is searched in the paired codebook subset of the target user; and the target user is informed of the weighted codebook of the target user and the codebook of the paired user by the node B through a control signaling. With the control signaling sending method, the target user can be informed of both an interference source weight and reselected codebook information at the same time under the condition of similar or same overhead, the control signaling of an SU-MIMO and the control signaling of an MU-MIMO are kept consistent, and the detection performance of the target user of the MU-MIMO is improved.
Description
Technical field
The present invention relates to the communications field, and especially, relate to a kind of control signaling method.
Background technology
At Long Term Evolution (Long term Evolution, LTE) in the network, at present to multi-user's multiple-input and multiple-output (multi-user multiple input multiple output, abbreviate MU-MIMO as) the notice problem of control signaling be in talking stage, current most company proposes in the MU-MIMO system, and node (Node B) need be notified to the recipient with interference source user's code book weights.So-called interference source user refers to that a plurality of users take under the situation of identical running time-frequency resource jointly in MU-MIMO, and In the view of some users, other users are the interference source user, and this user is the targeted customer.For the situation that has the interference source user, can be by notice interference source user's weights, the detection to receiving data that obtains gains.
In the control signaling design process of MU-MIMO, owing to the code book of UE feedback is made mistakes or some other reason, Node B may carry out code book gravity treatment (overriding); Therefore in the process of the control signaling of design MU-MIMO, notify the weights information of its interference source except needs, also need to notify the overriding information of weights.And if do not add the above-mentioned two kinds of information of notifying of processing, then can cause controlling the increase of signaling consumption.
The solution that proposes in the present LTE motion is as follows: (1) Node B is its corresponding interference source user's of notification target user interference weights only, whether its corresponding weights of notification target user carry out lastest imformation simultaneously, this advice method does not realize upgrading the notice of back code book, therefore is not easy to follow-up processing; (2) by code book is matched, obtain the code book set of some in advance, in the code book use, only use the code book for preparing in advance after right code book obtains gravity treatment, but adopt this method will limit the quantity that to match code book, be not easy to the application of code book.
So far, do not propose to solve the technical scheme of the problem that exists in the code book update notification process as yet.
Summary of the invention
Consider the problems referred to above and make the present invention, for this reason, main purpose of the present invention is to provide a kind of control signaling delivery plan, to solve the few and unspecific problem of content of announcement of this quantity of available codes that the code book update notification exists in the correlation technique.
According to embodiments of the invention, a kind of control signaling method is provided, be used for carrying out the notice of gravity treatment code book and the notice of interference source user code book at multi-user MIMO system.
This method comprises: for each code book in the code book set, corresponding gravity treatment codebook subset is set and can matches codebook subset, wherein, gravity treatment codebook subset and the codebook subset that can match all belong to the code book set; The code book of Node B receiving target user feedback, determining that according to the code book that receives needs carry out under the situation of code book gravity treatment, determining the gravity treatment codebook subset of the code book of reception, and therefrom select the weighting code book, the code book that adopts when wherein, the weighting code book carries out precoding for the targeted customer; Node B is determined the matched codebook subset of the weighting code book of selection, and determines the pairing user according to the matched code book in the matched codebook subset of determining, searches pairing user's code book in targeted customer's matched codebook subset; Node B is notified to the targeted customer by the control signaling with targeted customer's weighting code book and this pairing user's code book.
Wherein, can carry out the code book gravity treatment according to predetermined code book gravity treatment principle.
On the other hand, after the gravity treatment codebook subset being set and can matching codebook subset, this method can further comprise: according to the code book in the gravity treatment codebook subset that arranges with can match code book and this gravity treatment codebook subset in the codebook subset and the correlation that can match the corresponding code book of codebook subset, and this subclass of counterweight code selection and the code book difference append serial numbers in the codebook subset of can matching.
Like this, when selecting the weighting code book, the preferential good code book of correlation of selecting is as the weighting code book in the gravity treatment codebook subset.
And, when selecting the pairing user, preferentially select in the matched codebook subset of weighting code book with the good user of weighting code book correlation as the pairing user.
In addition, when Node B sends control signaling, pairing code book the index in the matched codebook subset of targeted customer's weighting code book correspondence of the index of weighting code book in the gravity treatment codebook subset with the pairing user is carried in the control signaling of transmission.
In addition, the gravity treatment codebook subset of setting and the size of codebook subset of can matching meet the following conditions:
Under the situation to the index absolute coding of the index of weighting code book and pairing user's code book,
Wherein, the attach most importance to size of this subclass of code selection of L, the size of K for matching codebook subset, x is the predetermined control signaling consumption, symbol
Expression rounds up;
Under the situation to the index combined coding of the index of weighting code book and pairing user's code book, then K and L satisfy
Wherein, the attach most importance to size of this subclass of code selection of L, the size of K for matching codebook subset, x is the predetermined control signaling consumption, symbol
Expression rounds up.
At this moment, when Node B determines that according to the code book of feedback needs do not carry out under the situation of code book gravity treatment, by a certain state representation in L state of gravity treatment code book control signaling.
In addition, determine not carry out under the situation of code book gravity treatment in Node B, directly adopt code book that the recipient feeds back as the weighting code book.
In addition, when each code book being arranged the gravity treatment codebook subset and can match codebook subset, when pre-determining under the situation that the probability that the code book gravity treatment occurs is lower than the predetermined probability threshold value, the size of gravity treatment codebook subset is set to 0, and when sending control signaling, Node B is the pairing user's of notification target user correspondence code book only, and does not carry out the code book gravity treatment.
According to another embodiment of the present invention, provide a kind of control signaling method, for the notice of controlling signaling under the situation that has multiple constraints at multi-user MIMO system.
This method comprises: each code book in the code book set arranges the codebook subset corresponding to various boundary conditions respectively; The code book of Node B receiving target user feedback, and in different subclass, select suitable code book according to the code book that receives respectively according to different constraints; Node B is given targeted customer at the index in the subclass separately by the control signaling with the code book selected in the different subclass by the control signaling.
By technique scheme of the present invention, can be in MU-MIMO expense and SU-MIMO expense quite or under the identical situation, the information of interference source weights and overriding code book is notified in realization to the targeted customer, when making the control signaling of the control signaling design of SU-MIMO and MU-MIMO keep consistency, the detection performance of raising MU-MIMO.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not constitute improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the control signaling method of the inventive method embodiment one;
Fig. 2 is the schematic diagram that arranges according to codebook subset in the control signaling method of the inventive method embodiment one;
Fig. 3 is the flow chart according to the processing example of the control signaling method of the inventive method embodiment one; And
Fig. 4 is the flow chart according to the control signaling method of the inventive method embodiment two.
Embodiment
The problem that exists based on the design of the control signaling of current MU-MIMO and the characteristics of code book set self the present invention proposes the descending control signaling sending method of a kind of MU-MIMO.
At first, following restriction relation based on the code book set: (1) is in the code book set, correlation between different code books there are differences, therefore the part code book during each code book only can be gathered with code book matches, be reflected in system's design, be same all other users that the user can not be random and match, but need selectively match; (2) under the situation of the overriding that carries out code book, different code books carry out the effect difference of overriding in the code book set to current code book, be the corresponding codebook subset of each code book, have only and carry out overriding with the code book in the subclass and can obtain effect preferably.
Characteristics based on the set of the code book of above-mentioned analysis, the thought of the control signaling method of the MU-MIMO that the present invention proposes is: (1) is based on the relation of other code books in each code book and the code book set, corresponding codebook subset is set respectively, and the code book in the codebook subset is numbered according to degree of correlation; (2) according to the code book of targeted customer's feedback, search the overriding code book; And according to the overriding code book of finding, find the codebook subset that matches of this overriding code book correspondence; Match according to code book and other users that can match in the codebook subset, can match in the codebook subset if certain user's code book is present in, the channel condition that this user is described satisfies the matching request with the targeted customer, otherwise does not satisfy; The sequence number of gravity treatment code book in the gravity treatment codebook subset and pairing user are notified to the targeted customer in the sequence number that can match in the code book.Describe embodiments of the invention in detail below in conjunction with accompanying drawing.
Method embodiment one
In the present embodiment, provide a kind of control signaling method, be used for carrying out the notice of gravity treatment code book and the notice of interference source user code book at multi-user MIMO system.
As shown in Figure 1, control signaling method according to present embodiment comprises: step S102, for each code book in the code book set, corresponding gravity treatment (overriding) codebook subset is set and can matches codebook subset, wherein, overriding codebook subset and the codebook subset that can match all belong to the code book set; Step S104, the code book of Node B receiving target user feedback, determining that according to the code book that receives needs carry out under the situation of code book overriding, determine the overriding codebook subset of the code book of reception, and therefrom select the weighting code book, the code book that adopts when wherein, the weighting code book carries out precoding for the targeted customer; Step S106, Node B is determined the matched codebook subset of the weighting code book of selection, and determines the pairing user according to the matched code book in the matched codebook subset of determining, searches pairing user's code book in targeted customer's matched codebook subset; Step S108, Node B is notified to the targeted customer by the control signaling with targeted customer's weighting code book and this pairing user's code book.
When selecting the pairing user, if the code book that has an a certain user is corresponding with certain code book that can match in the codebook subset, illustrate that then this user's channel condition and described targeted customer's channel condition are fit to match, claim this user interference source user for the targeted customer, otherwise there are not suitable other users that match with the targeted customer in explanation.
Fig. 2 schematically shows the situation that in above-mentioned steps S102 each code book in the code book set is arranged the overriding codebook subset and can match codebook subset.Each code book is to having oneself independently overriding codebook subset and the codebook subset that can match.
Wherein, can carry out the code book gravity treatment according to predetermined code book gravity treatment principle, to select to satisfy the weighting code book of this principle.
Perhaps, after the overriding codebook subset being set and can matching codebook subset, this method can further comprise: according to the code book in the overriding codebook subset that arranges with can match code book and this overriding codebook subset in the codebook subset and the correlation that can match the corresponding code book of codebook subset, to overriding codebook subset and the code book difference append serial numbers in the codebook subset of can matching.
At this moment, when selecting the weighting code book, can in the gravity treatment codebook subset, preferentially select the good code book of correlation as the weighting code book.
Similarly, when selecting the pairing user, can preferentially select in the matched codebook subset of weighting code book with the good user of weighting code book correlation as the pairing user.And that the correlated performance of this moment refers to match user's code book and targeted customer's orthogonality well is good.
In addition, when Node B sends control signaling, pairing code book the index in the matched codebook subset of targeted customer's weighting code book correspondence of the index of weighting code book in the gravity treatment codebook subset with the pairing user is carried in the control signaling of transmission.
Preferably, the described gravity treatment codebook subset of setting and described size of matching codebook subset meet the following conditions:
Under the situation to the index absolute coding of the index of described weighting code book and described pairing user's code book,
Wherein, L is the size of described gravity treatment codebook subset, and K is described size of matching codebook subset, and x is the predetermined control signaling consumption, symbol
Expression rounds up;
Under the situation to the index combined coding of the index of described weighting code book and described pairing user's code book, then K and L satisfy
Wherein, L is the size of described gravity treatment codebook subset, and K is described size of matching codebook subset, and x is the predetermined control signaling consumption, symbol
Expression rounds up.
In addition, preferably, L and K are 2 integral number power, so just can make data efficient utilization maximization, and carry out under the situation of combined coding allowing, and L and K be not for also can being 2 integral number power.Preferably, the form of control signaling is as shown in the table:
| Log2(L)bit | Log2(K)bit |
At this moment, preferably, when above-mentioned Node B determines that according to the code book of feedback needs do not carry out under the situation of code book gravity treatment, can control a certain state representation in L state of signaling by the gravity treatment code book, for example, 0 state.
In addition, preferably, determine not carry out under the situation of gravity treatment in above-mentioned Node B, can directly adopt code book that the recipient feeds back as the weighting code book.
In addition, when above-mentioned each code book being arranged the gravity treatment codebook subset and can match codebook subset, when pre-determining under the situation that the probability that the code book gravity treatment occurs is lower than the predetermined probability threshold value, the size of gravity treatment codebook subset is set to 0, and when sending control signaling, Node B is the pairing user's of notification target user correspondence code book only, and does not carry out the code book gravity treatment.
Alternatively, under the not strong situation of the above-mentioned binding character in the code book set, for with single user's multiple-input and multiple-output (Single user multiple input multiple output, SU-MIMO) control signaling compatibility, consider that simultaneously overriding belongs to small probability event, can adopt the strategy of only notifying the interference source user's who matches with the targeted customer code book this moment.
As shown in Figure 3, when reality is implemented, can comprise following processing according to the method for present embodiment:
(1) is respectively each code book relative codebook subset (reeligible codebook subset and the codebook subset that can match) is set, and codebook subset is sorted;
(2) (not shown) obtain the targeted customer the overriding code book and with the user's of its pairing code book, and in the subclass of the code book correspondence that the targeted customer feeds back, search overriding code book and the pairing user code book sequence number in subclass separately, the sequence number in each comfortable subclass is notified to the targeted customer.
In step (1), arranging specifically of codebook subset can may further comprise the steps:
(1a) (not shown) obtains overriding codebook subset and the codebook subset that can match.
Under the constraint-prioritized situation of control signaling consumption, can according to the descending code book control signaling consumption of MU-MIMO and with the compatible requirement of SU-MIMO, the size that the overriding codebook subset is set and can matches codebook subset, and according to the relation between code book in the code book set, select the easiest and current code book to carry out the code book of overriding and the code book of easy pairing respectively, place in the middle of the subclass respectively; Under the preferential situation of code book correlation, then can obtain the overriding codebook subset earlier and can match codebook subset, and based on the size of subclass, the control signaling consumption is set.
(1b) (not shown) sorts to the code book in each subclass according to the size of code book in each subclass and current code book correlation.
In step (2), obtain the code book of overriding and the code book that can match, and the processing that obtains its sequence number in subclass separately comprises the steps: specifically
(2a) Node B at first the pre-coding matrix index of receiving target user feedback (precoding matrix index, PMI).
(2b) according to the requirement of overriding, search the targeted customer and feed back the corresponding overriding codebook subset of code book and obtain code book sequence number available in the subclass, and carry out precoding with the targeted customer of overriding.When not needing to carry out overriding, then represent with certain particular state in L the state, for example 0 state.
(2c) according to user's matching request, obtain the best pairing user's of overriding code book correspondence code book, and obtain it in the sequence number that can match in the codebook subset.When needs carry out overriding, search pairing user's code book sequence number in the matched codebook subset of the overriding code book correspondence that in (2b) step, obtains, and the interference source user is carried out precoding; Otherwise in the matched codebook subset of the code book correspondence that the targeted customer feeds back, search pairing user's code book sequence number.
(2d) according to the sequence number of overriding code book and the sequence number that can match user's code book, design control signaling.The control signaling consumption is log2 (K)+log2 (L) bit; Under situation about considering with the control signaling compatibility of SU-MIMO, it is identical with the signaling consumption of SU-MIMO that signaling consumption should satisfy log2 (K)+log2 (L).
Wherein, receive when wrong at Node B side joint as the PMI of targeted customer feedback for step (2b), this moment, the targeted customer's that Node B side obtains PMI value was the PMI value of a mistake, if the code book in code book set this moment sorts, should pass probability and the code book correlation is taken all factors into consideration based on mistake during code book ordering in code book set this moment.Can reduce PMI feedback so greatly makes a mistake under the situation to the influence of such scheme.
Method embodiment two
In the present embodiment, provide a kind of control signaling method, for the notice of MU-MOMO control signaling under the situation that has multiple constraints at multi-user MIMO system.
As shown in Figure 4, comprise according to the control signaling method of present embodiment: step S402, each code book in the code book set arranges the codebook subset corresponding to various boundary conditions respectively; Step S404, the code book of Node B receiving target user feedback, and in different subclass, selecting suitable code book according to the code book that receives respectively according to different constraints; Step S406, Node B gives targeted customer at the index in the subclass separately by the control signaling with the code book selected in the different subclass by the control signaling.
That is to say, under having many group restriction relation situations in the code book set, also can make each code book corresponding to a plurality of codebook subsets, concrete subclass number should be reference according to control signaling needs information transmitted content.For example, can make gravity treatment constraints corresponding to the gravity treatment codebook subset, pairing constraints namely, makes the codebook subset of constraints corresponding to this constraints corresponding to the pairing codebook subset.
In sum, the present invention is based on the intrinsic characteristic of precoding codebook, the delivery plan of the control signaling of a kind of MU-MIMO has been proposed, this scheme is by taking full advantage of the correlation properties between code book, quite or under the identical situation, can notify the information of interference source weights and overriding code book at expense and SU-MIMO simultaneously.
By the code book sequence number in each codebook subset, both can know overriding code book and with the code book of its pairing, thereby in MU-MIMO, carry out under the situation of descending control signaling notice, only need interferer codebook weights and the overriding weights of log2 (K)+log2 (L) bit notice UE correspondence.Can be under the MU-MIMO situation, can carry out the subclass quantity of overriding and the flexible configuration of carrying out of the code book quantity that can match to each code book, the control signaling design of SU-MIMO and the control signaling design of MU-MIMO are kept consistency, thereby simplify the complexity of control signaling design.
By means of technical scheme of the present invention, can be in MU-MIMO expense and SU-MIMO expense quite or under the identical situation, the information of interference source weights and overriding code book is notified in realization to the targeted customer, make the control signaling design of SU-MIMO and the control signaling of MU-MIMO keep consistency, thereby simplified the complexity of control signaling design.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a control signaling method is used for carrying out the notice of gravity treatment code book and the notice of interference source user code book at multi-user MIMO system, it is characterized in that described method comprises:
For each code book in the code book set, corresponding gravity treatment codebook subset is set and can matches codebook subset, wherein, gravity treatment codebook subset and the codebook subset that can match all belong to described code book set;
The code book of Node B receiving target user feedback, determining that according to the described code book that receives needs carry out under the situation of code book gravity treatment, determine the gravity treatment codebook subset of the described code book of reception, and therefrom select the weighting code book, wherein, described weighting code book is the code book that described targeted customer adopts when carrying out precoding;
Described Node B is determined the matched codebook subset of the described weighting code book of selection, and determine the pairing user according to described the matched code book of determining that matches in the codebook subset, in described targeted customer's matched codebook subset, search described pairing user's code book;
Described Node B is notified to described targeted customer by the control signaling with described targeted customer's described weighting code book and described pairing user's code book.
2. method according to claim 1 is characterized in that, carries out the code book gravity treatment according to predetermined code book gravity treatment principle.
3. method according to claim 1 is characterized in that, described gravity treatment codebook subset and described the pairing behind the codebook subset are being set, and further comprises:
According to the code book in the described gravity treatment codebook subset that arranges with can match code book and this gravity treatment codebook subset in the codebook subset and the correlation that can match the corresponding code book of codebook subset, to described gravity treatment codebook subset and the code book difference append serial numbers in the codebook subset of can matching.
4. method according to claim 3 is characterized in that, when selecting described weighting code book, the preferential good code book of correlation of selecting is as described weighting code book in described gravity treatment codebook subset.
5. method according to claim 3 is characterized in that, when selecting described pairing user, preferentially selects in the matched codebook subset of described weighting code book with the good user of described weighting code book correlation as described pairing user.
6. method according to claim 3, it is characterized in that, when described Node B sends described control signaling, with described weighting code book in the gravity treatment codebook subset index and described pairing user's the index of pairing code book in the matched codebook subset of described targeted customer's described weighting code book correspondence be carried in the described control signaling of transmission.
7. according to each described method in the claim 1 to 6, it is characterized in that described gravity treatment codebook subset and the described size of matching codebook subset of setting meet the following conditions:
Under the situation to the index absolute coding of the index of described weighting code book and described pairing user's code book,
Wherein, L is the size of described gravity treatment codebook subset, and K is described size of matching codebook subset, and x is the predetermined control signaling consumption, symbol
Expression rounds up;
Under the situation to the index combined coding of the index of described weighting code book and described pairing user's code book, then K and L satisfy
Wherein, L is the size of described gravity treatment codebook subset, and K is described size of matching codebook subset, and x is the predetermined control signaling consumption, symbol
Expression rounds up.
8. method according to claim 7 is when described Node B determines that according to the described code book of feedback needs do not carry out under the situation of code book gravity treatment, by a certain state representation in L state of gravity treatment code book control signaling.
9. method according to claim 1 is characterized in that, determines not carry out under the situation of code book gravity treatment in described Node B, directly adopts code book that the recipient feeds back as the weighting code book.
10. according to each described method in the claim 1 to 6, described each code book is being arranged described gravity treatment codebook subset and described the pairing during codebook subset, when pre-determining under the situation that the probability that the code book gravity treatment occurs is lower than the predetermined probability threshold value, the size of described gravity treatment codebook subset is set to 0, and when sending described control signaling, described Node B is only notified the described pairing user's of described targeted customer's correspondence code book, and does not carry out the code book gravity treatment.
11. a control signaling method, the notice for controlling signaling under the situation that has multiple constraints at multi-user MIMO system is characterized in that described method comprises:
Each code book in the code book set arranges the codebook subset corresponding to various boundary conditions respectively;
The code book of Node B receiving target user feedback, and in different subclass, select suitable code book according to the described code book that receives respectively according to different constraints;
Described Node B is given described targeted customer with the index of code book in described subclass separately of selecting in the different subclass by the control signaling by the control signaling.
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| WO2006117665A1 (en) * | 2005-05-04 | 2006-11-09 | Nortel Networks Limited | Wireless feedback system and method |
| CN101110623A (en) * | 2007-08-30 | 2008-01-23 | 中国科学技术大学 | Part user feedback method for limited feedback of multiple-input multiple-output multi-user system |
| CN101132372A (en) * | 2007-08-14 | 2008-02-27 | 中兴通讯股份有限公司 | Representing method for broadband single-carrier system resource allocation |
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| WO2006117665A1 (en) * | 2005-05-04 | 2006-11-09 | Nortel Networks Limited | Wireless feedback system and method |
| CN101132372A (en) * | 2007-08-14 | 2008-02-27 | 中兴通讯股份有限公司 | Representing method for broadband single-carrier system resource allocation |
| CN101110623A (en) * | 2007-08-30 | 2008-01-23 | 中国科学技术大学 | Part user feedback method for limited feedback of multiple-input multiple-output multi-user system |
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