CN102917391B - A kind of information processing method, terminal and network side equipment - Google Patents
A kind of information processing method, terminal and network side equipment Download PDFInfo
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Abstract
Description
Technical field
The present invention relates to digital communicating field, more particularly to a kind of information processing method, terminal and network side equipment.
Background technology
For being wirelessly transferred, can be damaged when electric signal passes through wireless channel by the decay from different paths, whether The multicarrier system that traditional single-carrier system or present B3G and 4G are used, generally use coherent demodulation when receiving terminal demodulates, This just needs to estimate channel, and the method for conventional channel estimation is blind estimate and pilot tone estimation, i.e.,：Use simple nothing Ginseng is estimated and joins estimation using with channel time, having for frequency dependence feature, and spy is not for the slower system of channel variation Different processing, i.e.,.
The measurement of existing system and feedback, only consider this measurement result, therefore, the complexity that existing system calculates is high, Feedback is also higher with the resource consumption such as interacting.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of information processing method, terminal and network side equipment, can drop Low computation complexity, feedback overhead, the information content of the interaction of cooperative base station, reduce the consumption of resource.
In order to solve the above technical problems, a kind of information processing method of the present invention, including：
Terminal carries out channel measurement, preserves the information for the channel that this measurement obtains, the channel that this measurement is obtained The information for the channel that information obtains with last time measurement is pre-processed, and obtains difference value；
By difference value compared with the threshold value being pre-configured with, when difference value is less than threshold value, terminal is not to base station The information for the channel that this measurement obtains is fed back, or feeds back the information for the local channel that this measurement obtains.
Further, in single base station scene, channel measurement is the measurement to serving cell channel；
The serving cell channel that the information for the serving cell channel that terminal obtains this measurement obtains with last time measurement Information is pre-processed；
When obtained difference value is respectively less than threshold value, not to base station feedback, this measures obtained serving cell and believed terminal The information in road.
Further, in the scene of cooperative base station, channel measurement includes the measurement to serving cell channel and disturbed small The measurement of area's channel；
The serving cell channel that the information for the serving cell channel that terminal obtains this measurement obtains with last time measurement Information is pre-processed；The interfered cell channel that the information for the interfered cell channel that this measurement is obtained obtains with last time measurement Information pre-processed；
Terminal is when obtained difference value is respectively less than threshold value, the letter of channel that is not obtained to base station feedback this measurement Breath, or feed back one of any in this measurement obtained information of serving cell channel and the information of interfered cell channel.
Further, the information for the serving cell channel that terminal obtains in this measurement and the service that last time measurement obtains are small The difference value of the information of area's channel is less than threshold value, and the information for the interfered cell channel that this measurement obtains obtains with last time measurement The difference value of information of interfered cell channel when being more than threshold value, the interfered cell channel obtained to base station feedback this measurement Information.
Further, base station is scheduled in the information of the non-feedback channel of terminal using the schedule information of last computation； Or
When terminal feeds back the information for the serving cell channel that this measurement obtains, according to terminal, this measurement obtains for base station Serving cell channel information and this or the last time information of channel that interacts to obtain with interfered cell calculate schedule information Carry out this scheduling；Or
Base station is anti-to interfered cell interactive terminal when terminal feeds back the information for the interfered cell channel that this measurement obtains The information for the interfered cell channel that this measurement of feedback obtains.
Further, in addition to：
Difference value is fed back to base station by terminal when difference value is more than threshold value.
Further, pretreatment includes：Similarity measurement, difference processing and phase angle deviation processing.
Further, a kind of information processing method, including：
Terminal carries out channel measurement, preserves the information for the channel that this measurement obtains, the channel that this measurement is obtained The information for the channel that information obtains with last time measurement is pre-processed, and obtains difference value；
By difference value compared with the threshold value being pre-configured with, when difference value is less than threshold value, not to base station feedback Pre-coding matrix (PMI), or the PMI that feedback last computation obtains.
Further, in the scene of cooperative base station, for the worst cooperation PMI (WCI) and best cooperation PMI (BCI), terminal is when difference value is less than threshold value, not to base station feedback WCI and BCI, or the obtained WCI of feedback last computation and One of in BCI.
Further, a kind of information processing method, including：
Terminal carries out channel measurement, and the feedback of the information for the channel that this measurement is obtained is to base station；
Base station is by the information of the interfered cell channel of information and the last time feedback of the interfered cell channel of terminal this feedback Pre-processed, obtain difference value；
By difference value compared with the threshold value being pre-configured with, when difference value is less than threshold value, base station is not to interference The base station of cell interacts.
Further, when difference value is more than threshold value, the base station of base station and interfered cell interacts, by difference for base station Value feeds back to the base station of interfered cell.
Further, a kind of information processing method, including：
The information for the channel that base station obtained the information of this obtained channel with last time is pre-processed, and obtains difference Value；
Difference value compared with the threshold value being pre-configured with, is scheduled by base station according to comparative result.
Further, the information of the channel obtained is that base station carries out the information of channel that channel measurement obtains or base station from end Terminate the information of the channel received.
Further, in single base station scene, when difference value is less than threshold value, base station is believed using the scheduling of last computation Breath is scheduled；
In the scene of cooperative base station, base station is scheduled using the schedule information of last computation；Or believed according to this cell The information for the channel that the information in road and this or last time interact to obtain with interfered cell calculates schedule information and carries out this scheduling； Or the information of this obtained interfered cell channel is interacted to interfered cell.
Further, base station is when difference value is less than threshold value, the pre-coding matrix obtained using last computation；Cooperating One of in the scene of base station, for WCI and BCI, in WCI and BCI that base station is obtained using last computation.
Further, a kind of terminal, including：Channel measurement unit, pretreatment unit, comparing unit and information send single Member, wherein：
Channel measurement unit, for carrying out channel measurement, preserve the information for the channel that this measurement obtains；
Pretreatment unit, obtained for this information for measuring obtained channel by channel measurement unit with last time measurement The information of channel is pre-processed, and obtains difference value；
Comparing unit, for by difference value compared with the threshold value being pre-configured with；
Information transmitting unit, for when difference value is less than threshold value, this not to measure obtained channel to base station feedback Information, or feed back the information of local channel that this measurement obtains.
Further, information transmitting unit, it is additionally operable to when difference value is less than threshold value, not to base station feedback precoding square Battle array (PMI), or the PMI that feedback last computation obtains.
Further, a kind of network side equipment, including：Handed between information receiving unit, pretreatment unit, comparing unit and station Mutual unit, wherein：
Information receiving unit, the channel information for receiving terminal feedback；
Pretreatment unit, for by the interfered cell of information and the last time feedback of the interfered cell channel of terminal this feedback The information of channel is pre-processed, and obtains difference value；
Comparing unit, for by difference value compared with the threshold value being pre-configured with；
Interactive unit between standing, for when difference value is less than threshold value, not interacted to the base station of interfered cell.
Further, a kind of network side equipment, including：Pretreatment unit, comparing unit and scheduling unit, wherein：
Pretreatment unit, the information for the channel that the information of the channel for this to be obtained obtained with last time are located in advance Reason, obtains difference value；
Comparing unit, for by difference value compared with the threshold value being pre-configured with；
Scheduling unit, in single base station scene, when difference value is less than threshold value, being believed using the scheduling of last computation Breath is scheduled；In the scene of cooperative base station, it is scheduled using the schedule information of last computation；Or according to this cell channel Information and this or the last time information of channel that interacts to obtain with interfered cell calculate schedule information and carry out this scheduling.
Further, in addition to station between interactive unit, wherein：
Interactive unit between standing, in the scene of cooperative base station, when difference value is less than threshold value, being handed over to interfered cell The information of this mutual obtained interfered cell channel.
In summary, the present invention has the advantages that：
For low-speed mobile users, channel information is possible to slower in a period of time change, passes through the pre- place of receiving terminal Reason, can reduce unnecessary processing and feedback overhead；
When base station collaboration, the information content of interaction between cooperative base station can be reduced by pretreatment；
, can be by pre-processing the complexity for reducing code book and calculating when carrying out code book matching.
Brief description of the drawings
Fig. 1 is the flow chart of the information processing method of embodiment of the present invention；
Fig. 2 is the general principle figure of CoMP in the prior art；
Fig. 3 is the schematic diagram based on display feedback measuring method of present embodiment；
Fig. 4 is present embodiment based on the hidden schematic diagram for showing feedback measuring method.
Embodiment
Present embodiment by measuring channel, enter by the information for the channel that the information of this channel is obtained with last time measurement Row pretreatment, pretreatment can select the modes such as similarity measurement, difference processing and phase angular displacement, obtain this channel The difference value of the information of the channel of information and last time, and thresholding is set, when difference value is less than thresholding, next step process is carried out, Such as：By difference value composition feedback, the interaction of the calculating based on code book and cooperative base station based on measurement etc.；When difference value is higher than thresholding When, interaction etc. can be calculated and reduced without feedback, without code book, therefore, can effectively be dropped by present embodiment Low feedback overhead, the complexity of code book is calculated, reduce the capacity of base station interactive information, improve the performance of system.
The information processing method of present embodiment includes following steps：
Step 1：Initial channel measurement is carried out, obtains and preserves the information of channel；
Channel measurement includes：Channel estimation is carried out according to system requirements, channel estimation can be base station up channel measurement, It can also be down channel measurement；Demodulation, the information of feedback channel, and preserve the information of this channel.
Step 2：After second of channel measurement to n times is carried out, the information of channel is preserved, and obtained channel is believed Cease and pre-processed with the information of the channel of last time measurement；
Pretreatment can be similarity measurement, the difference processing processing procedure for obtaining difference similar with phase angular displacement etc.. Pretreatment can be used in continuous cycles measurement, e.g., the channel measurement of mobile terminal and the channel measurement of base station etc..
Step 3：Obtained difference value will be pre-processed compared with thresholding, according to difference value whether beyond the door set The comparative result of limit, differentiate the processing of next step.
, can be to the information of this channel and the letter of the channel of last time after second of channel measurement to n times is completed Breath carries out similarity measurement, the difference value using value of similarity measure as pretreatment, using channel similarity M as consistency discrimination Thresholding, by value of similarity measure compared with channel similarity M.
Similarity measurement can be existing vector similarity method of discrimination, e.g., the Euclidean between two vectors (Euclid) distance, i.e.,：D (H (N), H (N+1)), the cosine function of two vectorial angles and etc. similarity differentiate etc. side Method.
Threshold value can determine according to the statistical information of channel measurement, translational speed that can also be according to such as user, needs The factor such as feedback cycle setting, load of chordal distance and feedback channel between code book be adjusted, can also be according to existing Pre-coding matrix rotation distance assess difference determine and adjustment, for example, when the load of feedback channel is larger, thresholding is adjusted Greatly, feedback granularity is reduced.
When the value of similarity measure of the information of the channel of channel measurement twice is less than thresholding, for feedback and collaborative interactive It can select not interact, be retrieved without PMI (Precoding Matrix Indicator, pre-coding matrix), directly be utilized Last result of calculation；When the value of similarity measure of channel measurement twice is more than thresholding, this calculating is carried out.
For operation of the terminal to base station feedback information, information compressing method can be used, as feedack can be by Pretreated result composition, the difference value that such as feedback pretreatment obtains, letter difference value can be only interacted for cooperative base station, It can be fed back by metrical information and interactive.
Embodiment 1 (channel measurement and feedback of cooperative base station)：
It is the principle schematic of cell cooperative shown in Fig. 3, mobile terminal UE 1 is located in cell 1, and mobile terminal UE 2 is located at In cell 2, UE1 and UE2 take identical running time-frequency resource, and interfering makes respective hydraulic performance decline, and cell 1 and cell 2 are made For collaboration set, UE1 and UE2 is established as pairing user.
The process of the display feedback of cooperative base station is described below.
Step 1：Initial channel measures；
For each UE, UE1 and UE2 as shown in Figure 3, the channel of this cell is measured, obtains the information H of channel11With H22, UE is to be referred to as display feedback using the principal character of channel as the content of feedback, such as feedback channel according to the order of high level Information H11、H22Or the principal character such as characteristic value and channel vector, also can the covariance (Ri) of feedback channel or the main spy of (Ri) Sign.
Also need to measure the channel H of interfered cell respectively for cell cooperative UE1 and UE212And H21, and according to high level Order, by the information H of channel12、H21Or content of the principal character of channel as feedback, or the covariance of feedback interference channel (Ri) or (Ri) principal character.
As shown in figure 3, for cell cooperative, UE1 measurements H11、H12Or channel principal character, or the covariance of channel (Ri), or (Ri) principal character, UE2 measurement H22、H21Or channel principal character, or the covariance (Ri) of channel, or (Ri) Principal character.
In the present embodiment 1 can also feedback channel matrixes, the feedback of other channels can be extended as example, such as anti- Channel vector or characteristic value etc. are presented, display feedback overhead amount is bigger, and the present embodiment 1 uses channel matrix feedback, with more multiple Miscellaneous base station collaboration is main body, and other feedback models can be extended exemplified by secondary, and single base station model can only measure H11With H22。
Step 2：Metrical information preprocessing process and feedback and interaction；
As shown in figure 4, the measurement result H retained according to last UE111(N)、H12(N), new H is being obtained11(N+1)、 H12(N+1) after measurement result, H is differentiated respectively11And H (N)11(N+1), H12And H (N)12(N+1) similarity, two are such as calculated Euclidean distances between channel vector, or carry out the processing such as two vectorial included angle cosines.
If UE1 judges H11And H (N)11(N+1), H12And H (N)12(N+1) similarity is respectively less than the door of default Limit, it is believed that channel does not change, i.e. the interference user of this community user and cooperation cell does not move, then this frame of UE1 is not anti- Present H11And H (N+1)12, or only feedback fraction measured value such as H (N+1)11Or H (N+1)12(N+1)。
Base station determines whether this carries out the interaction between base station, if this frame does not feed back, UE1's according to UE1 feedback Serving cell 1, by the information processing of last scheduled；
If this frame feeds back H11(N+1), the neighbour of the measured value of this cell 1 that cell 1 is fed back according to this frame and last time interaction The measured value of cell carries out this scheduling and calculated；
If this frame feeds back H12(N+1), cell 1 interacts H to cell 212(N+1), cell 1 is entered according to last scheduled result Row processing, cell 2 is according to interactive H12(N+1) and cell 2 feedback information determine this scheduling result.Similarly, can also The cell 2 of popularization, and more cooperative base stations.
For uncooperative base station, the measurement H of this base station is only differentiated11(N+1) H measured with the last time11(N) similarity, Similar, this frame does not feed back, or is fed back according to system requirements, and the interaction of channel measurement is not present between base station.
UE1 is if it is determined that H12And H (N)12(N+1) similarity-rough set result is less than the thresholding of default, then it is assumed that interference Community user does not move, then this frame does not feed back H12(N+1), H11And H (N)11(N+1) similarity-rough set result is more than door Limit, then feed back H11(N+1)。
Base station determines it is H according to UE1 feedback11(N+1) result of this scheduling is determined, without the interaction between base station, I.e. cell 1 determines this scheduling according to the interaction scenario of this side amount result and cell 2, i.e., if the interactive channel H of cell 221(N+ 1), cell 1 is according to H11(N+1)、H21(N+1) this scheduling result is determined, otherwise cell 1 is according to H11(N+1)、H21(N) this is determined Secondary scheduling result；Similarly, the cell 2 that can also be promoted, and more cooperative base stations.
If UE1 judges H11And H (N)11(N+1) similarity is less than the thresholding of setting, then it is assumed that this community user does not have Mobile, this frame does not feed back H11(N+1), H12And H (N)12(N+1) similarity is more than the thresholding of setting, then it is assumed that interference user Channel converts, and feeds back H12(N+1)。
Base station determines whether this carries out the interaction between base station, this frame feedback H according to UE1 feedback12(N+1), cell 1 to Cell 2 interacts H12(N+1), cell 1 determines scheduling result according to the interaction scenario of cell 2, if cell 2 interacts H to cell 121 (N+1), then cell 1 according to H11And H (N)21(N+1) this scheduling result is determined；Otherwise, cell 1 is according to H11(N)、H21(N) certainly This fixed scheduling result；The cell 2 that can also be promoted, and more cooperative base stations.
Embodiment 2 (channel measurement of cooperative base station is retrieved with code book)：
The compressed feedback of single base station.
What embodiment 1 was fed back is channel characteristics, can also feed back the result after pretreatment, and can expand to cooperation base Stand.
Step 1：Channel measurement；
UE1 and UE2, UE1 as shown in Figure 3 measures the channel H of this cell11, UE2 measures the channel H of this cell22。
Step 2：Metrical information pre-processes and feedback；
UE1 retains measurement result H according to the last time11(N), H is being obtained11(N+1) after, H is first differentiated11And H (N)11(N+1) Similarity, that is, carry out the Euclidean distances between two channel vectors, or the processing such as two vectorial included angle cosines.
Work as H11And H (N)11(N+1) when similarity is less than the thresholding of setting, it is believed that this community user does not move, then this frame Do not feed back H11(N+1)。
Work as H11And H (N)11(N+1) when similarity is more than the thresholding of setting, it is believed that this community user channel changes, this When, according to the algorithm of similarity, vectorial angle cosine such as is used, then feeds back included angle cosine value, as using between two vectors Euclidean distances, i.e.,：D (H (N), H (N+1)), then feed back Euclidean distances D.
Step 3：Information recovering calculates with scheduling；
Base station recovers H (N+1) according to the Euclidean distances D of feedback and the H (N) of reservation, according to w 'iH′wiTravel through code This collection, obtain and optimal issue weights.
Embodiment 3 (channel measurement and implicit feedback)：
It is to concentrate to choose code word w in code book that common code book, which calculates, traversal formula w 'iH′Hwi, seeking mark, (approximation regards interference as The size of intensity), if adjacent area interference channel is chosen, using w corresponding to maximum as interference characteristic vector feedback WCI (worst Companion PMIs, the worst cooperation PMI), mark minimum is considered BCI (cooperations best best-companion PMI PMI)；If choosing this cell channel, w corresponding to maximum is as optimal PMI.Certainly it is also not limited to the code book of above formula Selection, can be applied before all code book traversal methods.
The present embodiment is applied to the codebook selecting of single base station, is also suitable the optimal codebook selecting of cooperative base station, and best Or the worst codebook selecting.The present embodiment illustrates that the interference code book of cooperative base station can be according to implementation by taking the PMI of single base station as an example The interference channel H of example 112(N+1) calculate.
Existing computational methods, UE need to travel through code book collection, and complexity is higher, and therefore, the present embodiment first carries out channel phase Like the differentiation of degree, if channel is similar, the last code book preserved is fed back, otherwise, new code book is calculated according to above formula.
Step 1, channel measurement；
As shown in figure 3, UE1 measures the channel H of this cell11, UE2 measures the channel H of this cell22。
Step 2, receive information pretreatment；
The measurement result H that UE1 retains according to the last time11(N), H is being obtained11(N+1) after, H is differentiated11And H (N)11(N+1) Similarity, that is, carry out the Euclidean distances between two channel vectors, or the processing such as two vectorial included angle cosines.
Work as H11And H (N)11(N+1) when similarity is less than the thresholding of setting, it is believed that this community user does not move, then this frame PMI is not calculated, is fed back with the PMI of previous frame, or do not feed back.
Work as H11And H (N)11(N+1) when similarity is more than the thresholding of setting, it is believed that this community user channel changes, Now, travel through code book and find optimal code book, fed back, or according to Euclidean distances, chordal distance ＜ is concentrated in code book Traveled through in the code book of Euclidean distances, choose optimal code book.
Step 3：Differential feedback；
As shown in figure 4, when needing feedback, PMI index can be fed back, differential feedback can also be selected, i.e.,：Feedback is originally The difference of the PMI of secondary feedback index and the PMI of last time feedback index.
Embodiment 4 (cooperative base station interaction)：
When UE on request without the feedback of pretreatment when, pretreatment is interacted by base station, decides whether to interact.
1) terminal display feedback：
The measurement result H that base station is fed back according to last UE111And H (N)12(N), new H is being obtained11And H (N+1)12(N+1) Afterwards, H is differentiated11And H (N)11(N+1), H12And H (N)12(N+1) between similarity, i.e. two channel vectors of progress Euclidean distances, or the processing such as two vectorial included angle cosines.
If H12And H (N)12(N+1) similarity is less than the thresholding of setting, then cell 1 is not between the progress of cell 2 base station Interaction.The cell 2 and more cooperative base stations that can also be promoted.
Cell 1 such as can use vectorial angle cosine, then feed back included angle cosine when interacting according to the algorithm of similarity Value, as using the Euclidean distances between two vectors, D (H (N), H (N+1)), then fed back Euclidean distances D.
Cell 2 recovers H (N+1) according to the Euclidean distances D and cell 2 of the feedback H (N) retained.
The information for the channel that can also be obtained the information of this obtained channel and last time by base station in present embodiment Pre-processed, obtain difference value；By difference value compared with the threshold value being pre-configured with, adjusted according to comparative result Degree.
The information for the channel that base station obtains is that base station carries out the information for the channel that channel measurement obtains or base station connects from terminal The information of the channel received.
In single base station scene, when difference value is less than threshold value, base station is adjusted using the schedule information of last computation Degree；In the scene of cooperative base station, base station is scheduled using the schedule information of last computation；Or the letter according to this cell channel The information calculating schedule information for the channel that breath and this or last time interact to obtain with interfered cell carries out this scheduling；Or to dry Disturb the information that cell interacts this obtained interfered cell channel.
Base station is when difference value is less than threshold value, the pre-coding matrix that is obtained using last computation；In the field of cooperative base station One of Jing Zhong, for WCI and BCI, in WCI and BCI that base station is obtained using last computation.
Present embodiment additionally provides a kind of terminal, including：Channel measurement unit, pretreatment unit, comparing unit and letter Transmitting element is ceased, wherein：
Channel measurement unit, for carrying out channel measurement, preserve the information for the channel that this measurement obtains；
Pretreatment unit, obtained for this information for measuring obtained channel by channel measurement unit with last time measurement The information of channel is pre-processed, and obtains difference value；
Comparing unit, for by difference value compared with the threshold value being pre-configured with；
Information transmitting unit, for when difference value is less than threshold value, this not to measure obtained channel to base station feedback Information, or feed back the information of local channel that this measurement obtains.
Information transmitting unit, it is additionally operable to when difference value is less than threshold value, not to base station feedback pre-coding matrix (PMI), Or the PMI that feedback last computation obtains.
Present embodiment additionally provides a kind of network side equipment, including：Information receiving unit, pretreatment unit, comparison list Interactive unit between member and station, wherein：
Information receiving unit, the channel information for receiving terminal feedback；
Pretreatment unit, for by the interfered cell of information and the last time feedback of the interfered cell channel of terminal this feedback The information of channel is pre-processed, and obtains difference value；
Comparing unit, for by difference value compared with the threshold value being pre-configured with；
Interactive unit between standing, for when difference value is less than threshold value, not interacted to the base station of interfered cell.
Another network side equipment that present embodiment provides, including：Pretreatment unit, comparing unit and scheduling unit, Wherein：
Pretreatment unit, the information for the channel that the information of the channel for this to be obtained obtained with last time are located in advance Reason, obtains difference value；
Comparing unit, for by difference value compared with the threshold value being pre-configured with；
Scheduling unit, in single base station scene, when difference value is less than threshold value, being believed using the scheduling of last computation Breath is scheduled；In the scene of cooperative base station, it is scheduled using the schedule information of last computation；Or according to this cell channel Information and this or the last time information of channel that interacts to obtain with interfered cell calculate schedule information and carry out this scheduling.
Network side equipment also includes interactive unit between station, interactive unit between standing, in the scene of cooperative base station, in difference When different value is less than threshold value, the information of this obtained interfered cell channel is interacted to interfered cell.
Certainly, the present invention can also have other various embodiments, ripe in the case of without departing substantially from spirit of the invention and its essence Know those skilled in the art when can be made according to the present invention it is various it is corresponding change and deformation, but these corresponding change and become Shape should all belong to the protection domain of appended claims of the invention.
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