CN102546113A - LTE channel measurement and feedback method - Google Patents
LTE channel measurement and feedback method Download PDFInfo
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Abstract
The invention discloses an LTE (Long Term Evolution) channel measurement and feedback method suitable for the CoMP (Coordinated Multi-Point) working mode. A base station configures CSI-RS resources for signal transmission points in the CoMP; a terminal performs channel measurement on the signal transmission points according to the CSI-RS resources, and feed the signal transmission points of which the signal-to-noise ratio satisfies the preset condition back to the base station; the base station selects the signal transmission points according to the feedback information of the terminal and the given working information of the base station side, and sets one or more measurement assumptions and corresponding CSI-RS resources; the terminal performs further channel measurement and feeds back the measurement information according to the measurement assumptions and the corresponding CSI-RS resources; and if the measurement information fed back by the terminal can not determine the resource dispatching mode, the terminal repeatedly performs measurement and feedback till the base station can determine the resource dispatching mode for resource dispatching. The method provided by the invention solves the problem in the prior art that the terminal has large calculated amount due to coexistence of various measurement assumptions.
Description
Technical field
The present invention relates to the field, particularly the channel measurement of a kind of LTE and feedback method.
Background technology
Long Term Evolution (LTE, Long Term Evolution) project is the evolution of 3G, and it improves and strengthened the aerial access technology of 3G.Adopt OFDM (OFDM, Orthogonal Frequency Division Multiplexing) and MIMO (multiple-input and multiple-output, Multiple-Input Multiple-Out-put) sole criterion as its wireless network evolution.The peak rate of descending 100Mbit/s and up 50Mbit/s can be provided under the 20MHz spectral bandwidth.Improve the performance of Cell Edge User, improved cell capacity, and reduced system delay.
In Rel 11, multi-point cooperative (CoMP, Cordinated multi-point) is a kind of MIMO technology, through the cooperation of a plurality of signal launch points, with being originally that interference signals becomes the signal that can help to improve performance.There is common part in CoMP as the branch and the other types usage of MIMO technology, but because the difference of working method also has unique consideration point.
The power division problem: in traditional M IMO system, because each antenna is all located placement in the base station, so their transmitting power is limited by total base station power.And for CoMP, the Power Limitation at possible each eNB/RRH place is all different, therefore can cause different optimization conclusions.For example, whether the constant power designed code book is suitable.
The CoMP implementation method is divided into two big types altogether: Combined Treatment JP mode and cooperative scheduling/wave beam forming (CS/CB, Cordinated Scheduling/Beamforming) mode.Wherein, JP mode characteristics are that terminal data each launch point in CoMP cooperating set all maybe the launch terminal data.The characteristics of CS/CB mode are that terminal data only exists at Serving cell, and still, the decision of scheduling/wave beam forming is that unification is made under coordinating in all sub-districts that the CoMP launch point set of channel measurement work is carried out at the terminal.
The terminal mainly is based on the CSI-RS resource to the measurement of channel information, in LTE Rel 10, for the possible position of CSI-RS in the LTE frame structure of different antennae port number; Add that the cycle information that these positions possibly occur constitutes a CSI-RS resource distribution, the base station is notified its that which prepares to select dispose for each terminal with high-level signaling to supply the terminal to carry out channel measurement, if the terminal is when doing real-time measurement; Channel variation is very fast; Just need configuration cycle shorter so accordingly, channel variation is very fast, perhaps does the long-term channel statistical property average the time; Can the cycle of configuration be established length a bit, to save resource.
There is the method for following metrical information and feedback at the terminal
Explicit channel feedback: the content of explicit feedback comprises channel strip, noise and interference sections; Wherein channel strip is the channel status that the feedback receiving terminal is seen; One or more characteristic of channel that in a sub-frame, needs each sub-district in the reporting measurement set; Comprise instantaneous channel matrix, the transmitting channel correlation matrix of statistics and the dominant eigenvalue part of instantaneous channel, the feedback of noise and interference sections can be beyond the terminal to report sub-district or CoMP sends the interference beyond the sub-district; Also can be the gross power that receives, or the correlation matrix of noise and interference etc.
Implicit channel feedback: implicit feedback defines different feedback models to different hypothesis, like single user or multiuser MIMO, and single sub-district or cooperation transmission, single-point (CB/CS) transmission or multiple spot (JP) transmission etc.Declaration form sub-district PMI or many sub-districts PMI on the JP feedback, CB/CS can feed back the PMIs of declaration form sub-district or a plurality of single sub-districts, also can feed back information such as the characteristic value of the other types beyond the PMI etc.
Utilize the SRS feedback of up-downgoing channel symmetry under the TDD system: utilize the symmetry of channel, terminal transmission SRS can be used as eNB and carry out the channel condition information estimation, and this method is particularly suitable in the TDD system.
Wherein implicit channel feedback is the main feedback system that adopts, but owing to adopt different hypothesis can cause various signals information, supports multiple CoMP mode to cause feedback letter complicated simultaneously.
Fig. 1 is the sketch map that comprises 2 sub-districts under a kind of CoMP mode of operation; As shown in Figure 1, at the base station configuration related resource and after measuring hypothesis, feedback information was shown in table one after channel measurement was carried out at the terminal.
Table one
Can be known that by table one because multiple hypothesis and depositing causes the terminal amount of calculation big, simultaneously up feedback quantity increases, system burden is overweight.And for this mode of operation of CoMP; In order to guarantee to find definite interference launch point, need to arrange launch point as much as possible to measure, like this along with the increase of the number of participating in the base station by the terminal; The terminal number that is associated increases, and its complexity can non-linear growth.
In sum, under the CoMP mode of operation of the prior art, when carrying out channel measurement and feedback, the situation that has multiple measurement hypothesis and deposit causes the terminal amount of calculation big.
Summary of the invention
The invention provides channel measurement and the feedback method of a kind of LTE, this method has solved in the prior art multiple measurement hypothesis and has deposited the problem that the terminal amount of calculation is big.
The invention discloses channel measurement and the feedback method of a kind of LTE, this method is applicable to the CoMP mode of operation, and this method comprises:
Step 1: the base station is each the signal launch point configurating channel state information measurement pilot frequency CSI-RS resource among the CoMP, and the CSI-RS configuration information of resource is sent to the terminal;
Step 2: the terminal is carried out channel measurement operation according to said CSI-RS configuration information of resource to each the signal launch point among the CoMP, sorts according to the signal to noise ratio that gets access to; Signal to noise ratio is satisfied pre-conditioned signal launch point feed back to the base station;
Step 3: the signal launch point is chosen according to the feedback information and the known job information of base station side at terminal in the base station, is that the terminal is provided with one or more measurement hypothesis and corresponding C SI-RS resource according to selected signal launch point; Said measurement hypothesis and corresponding C SI-RS configuration information of resource are sent to the terminal;
Step 4: further channel measurement is carried out according to said measurement hypothesis and corresponding C SI-RS resource in the terminal, and the metrical information of selected signal launch point is fed back to the base station; The resource pre-scheduling is carried out according to the feedback information at terminal in the base station, if the metrical information of terminal feedback is not sure of the scheduling of resource mode, the base station repeats step 3, if the metrical information of terminal feedback can be confirmed the scheduling of resource mode, then execution in step 5;
Step 5: scheduling of resource is carried out according to the scheduling of resource mode of confirming in the base station.
In said method, saidly signal to noise ratio is satisfied pre-conditioned signal launch point feed back to the base station and comprise:
Each signal launch point of being received is sorted by signal to noise ratio from big to small, is benchmark with the maximum signal to noise ratio, is chosen at the whole signal launch points in certain attenuation range;
Perhaps
Each signal launch point of being received is sorted by signal to noise ratio from big to small, is benchmark with the interference of the extra-regional signal launch point of corresponding CoMP, chooses the whole signal launch points that exceed certain power bracket;
Perhaps,
Each signal launch point of being received is sorted by signal to noise ratio from big to small, is benchmark with the maximum signal to noise ratio, with other signal launch point as interference source; From putting interference source under signal source one by one to weak by force, the signal to noise ratio after merging reaches a designated value by signal to noise ratio; Wherein, all the signal launch points in the signal source are the signal launch point of choosing;
Perhaps,
Each signal launch point of being received is sorted by signal to noise ratio from big to small, is benchmark with the maximum signal to noise ratio, with other signal launch point as interference source; By signal to noise ratio from putting interference source under signal source one by one to weak by force, up to the variable quantity that merges the signal to noise ratio operation for adjacent twice less than a designated value; Wherein, all the signal launch points in the signal source are the signal launch point of choosing;
The metrical information of selected signal launch point is fed back to the base station.
In said method, saidly signal to noise ratio is satisfied pre-conditioned signal launch point feed back to the base station and comprise:
The base station disposes a specific signal launch point as the reference point through high-level signaling; With the signal to noise ratio of received signal launch point by ordering from big to small, with all signal to noise ratios greater than the signal launch point of the signal to noise ratio of said reference point as the signal launch point of choosing.
In said method, said metrical information with selected signal launch point feeds back to the base station and comprises:
The ID of pre-conditioned signal launch point will be satisfied in the terminal and the number of signal launch point feeds back to the base station.
In said method, the ID that pre-conditioned signal launch point will be satisfied in said terminal feeds back to the base station and comprises:
The terminal feeds back to the base station with the ID of the CSI-RS resource that comprises in the pairing CSI-RS resource allocation information of selected signal launch point,
The base station is through the ID of the ID respective signal launch point of said CSI-RS resource.
In said method, said base station is chosen the signal launch point and is comprised according to the feedback information and the known job information of base station side at terminal:
The base station in conjunction with the known job information of base station side, is chosen the uncertain signal launch point of scheduling of resource mode according to the information of the signal launch point of terminal feedback in the signal launch point of terminal feedback.
In said method, said measurement hypothesis comprises:
The information of the signal launch point of choosing, the information of the signal launch point of definite state, and preferential CoMP mode of operation.
In said method, said is that the terminal is provided with one or more measurements hypothesis and comprises according to selected signal launch point:
When a plurality of signal launch point of base station selection,
When selected signal launch point belongs to three sectors of a sub-district, in the time of relatively partially or frequency deviation less than designated value, the base station is that the preferential CoMP mode of operation that the terminal is provided with is: carry out channel measurement according to the JT mode;
When selected signal launch point belongs to different sites, in the time of relatively partially or frequency deviation greater than designated value, the base station is that the preferential CoMP mode of operation that the terminal is provided with is: carry out channel measurement according to the CS/CB mode.
In said method, said is that the terminal is provided with one or more measurements hypothesis and comprises according to selected signal launch point:
When a plurality of launch points of a plurality of terminal feedback all are with macro base station during for the strongest launch point, the base station is that the preferential CoMP mode of operation that the terminal is provided with is: with the cell splitting gain is priority principle, closes the signal launch point of macro base station.
In said method, said is that the terminal is provided with one or more measurements hypothesis and comprises according to selected signal launch point:
The scheduling of resource mode of the part signal launch point of having confirmed when the base station, the information of the signal launch point that the base station will have been confirmed is provided with measurement and supposes as the interference parameter that influence all the other terminals.
In sum, the present invention at first arranges CSI-RS to carry out the channel measurement of long-time quality through the base station to each signal launch point, filters out part earlier to the influential signal launch point in terminal.Through confirming that which launch point may be influential, feed back to the base station, help the base station effectively to get rid of inappropriate working hypothesis according to actual conditions.Can reduce requirement, hold more launch point, help the enforcement of CoMP scheme configuration cycle.Progressively confirm working hypothesis through the base station; Carrying out real corresponding data channel transmitted again measures; Can effectively reduce the amount of calculation at terminal, reduce invalid number of computations, also reduce the burden of up-link wireless transmission simultaneously through the low working hypothesis that excludes the possibility.
Description of drawings
Fig. 1 is the sketch map that comprises 2 sub-districts under a kind of CoMP mode of operation;
Fig. 2 is the channel measurement of a kind of LTE among the present invention and the flow chart of feedback method;
Fig. 3 is the channel measurement of a kind of LTE among the present invention and the detail flowchart of feedback method;
Fig. 4 is the work sketch map of many sub-districts under a kind of CoMP pattern among the present invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.
Fig. 2 is the channel measurement of a kind of LTE among the present invention and the flow chart of feedback method, and is as shown in Figure 2,
Step 201: step 1: the base station is each the signal launch point configurating channel state information measurement pilot frequency CSI-RS resource among the CoMP, and the CSI-RS configuration information of resource is sent to the terminal;
Step 202: the terminal is carried out channel measurement operation according to said CSI-RS configuration information of resource to each the signal launch point among the CoMP, sorts according to the signal to noise ratio that gets access to; Signal to noise ratio is satisfied pre-conditioned signal launch point feed back to the base station;
Step 203: the signal launch point is chosen according to the feedback information and the known job information of base station side at terminal in the base station, is that the terminal is provided with one or more measurement hypothesis and corresponding C SI-RS resource according to selected signal launch point; Said measurement hypothesis and corresponding C SI-RS configuration information of resource are sent to the terminal;
Step 204: further channel measurement is carried out according to said measurement hypothesis and corresponding C SI-RS resource in the terminal, and the metrical information of selected signal launch point is fed back to the base station; The resource pre-scheduling is carried out according to the feedback information at terminal in the base station, if the metrical information of terminal feedback is not sure of the scheduling of resource mode, the base station repeats step 203, if the metrical information of terminal feedback can be confirmed the scheduling of resource mode, then execution in step 205;
Step 205: scheduling of resource is carried out according to the scheduling of resource mode of confirming in the base station.
Fig. 3 is the channel measurement of a kind of LTE among the present invention and the detail flowchart of feedback method; It is as shown in Figure 3,
Step 301, base station are the CSI-RS resource that each the signal launch point in the CoMP collaboration region disposes characteristic when supplying channel measurement long, and the CSI-RS configuration information of resource is sent to each terminal.
In step 301, base station side is the CSI-RS resource that each the signal launch point in the CoMP collaboration region disposes characteristic when being used for measured channel length, preserves the corresponding relation of signal launch point and CSI-RS resource in base station side.Be that base station side can be through the ID of the CSI-RS resource in the CSI-RS resource allocation information of terminal feedback, obtain the ID of said CSI-RS resource institute respective signal launch point in this locality.
Step 302, terminal are not with any measurement hypothesis, according to the carry out channel measurement of CSI-RS resource to all signal launch points; Filter out the influential signal launch point in this terminal, said signal launch point is fed back to the base station.
In step 302; The terminal is carried out channel measurement operation according to the CSI-RS resource of base station configuration to each signal launch point; Gather the signal to noise ratio of each signal launch point;, go out the influential signal launch point in said terminal according to sorting from big to small according to the signal to noise ratio that gets access to through certain Rules Filtering.
Wherein, said influential signal launch point is meant that the signal that this signal launch point sends is influential to said terminal, and said signal launch point possibly be macro base station or little base station, the i.e. signal source that service is provided for said terminal; Also possibly be that transfer of data to said terminal causes interference signals launch point, i.e. interference source.
In an embodiment of the present invention, each signal launch point of being received being sorted by signal to noise ratio from big to small, is benchmark with the maximum signal to noise ratio, is chosen at the whole signal launch points in certain attenuation range.Wherein, said certain attenuation range can be according to the configuration of base station, or actual network design situation is set; Can be 3db like said attenuation range.
Perhaps, each signal launch point of being received being sorted by signal to noise ratio from big to small, is benchmark with the interference of the extra-regional signal launch point of corresponding CoMP, chooses the whole signal launch points that exceed certain power bracket; Wherein, Signal launch point measuring assembly comprises the signal launch point that all will be considered; The interference that the signal of the launch point beyond the corresponding RRM measuring assembly of the extra-regional signal launch point of said corresponding CoMP produces; Because the terminal does not have independent reference symbol resource to measure the extra-regional signal launch point of all CoMP, can only measure whole structure.For example, wherein, exceeding the certain power scope is 3dB
In another embodiment of the invention, each signal launch point of being received being sorted by signal to noise ratio from big to small, is benchmark with the maximum signal to noise ratio, and the signal launch point of other that will be except that maximum signal to noise ratio is as interference source; From putting interference source under signal source one by one to weak by force, through merging the signal to noise ratio operation, the signal to noise ratio after merging reaches a designated value by signal to noise ratio, for example, and 3dB.Wherein, merge signal to noise ratio and pass through formula
Calculate; Wherein, P
MergeBe the signal to noise ratio after merging, P
Signal sourceBe the detection received power sum of all useful signals of a plurality of signal sources of merging, P
Interference sourceFor measuring the detection received power sum of the outer a plurality of interference sources of launch point set, P
NoiseBe noise power.
In other embodiments of the invention, each signal launch point of being received being sorted by signal to noise ratio from big to small, is benchmark with the maximum signal to noise ratio, and the signal launch point of other that will be except that maximum signal to noise ratio is as interference source; By signal to noise ratio from putting interference source under signal source one by one to weak by force, through merging the signal to noise ratio operation, up to the variable quantity of adjacent twice merging signal to noise ratio operation less than designated value, for example a 1dB.
Wherein, all signal launch points that put signal source under are the signal launch point of choosing.
In other screenings embodiment of the present invention, each signal launch point of being received is sorted by signal to noise ratio from big to small, the signal launch point that the maximum signal to noise ratio of receiving is corresponding is as signal source; Remaining signal launch point all as interference source, is got rid of interference source, wherein one by one; Suppose that the base station closes emission, noiseless power calculates and merges signal to noise ratio; When the merging signal to noise ratio that obtains during greater than set point, or the variable quantity of twice adjacent calculating is less than designated value; Then with all signal sources in the said merging signal to noise ratio and close power emission point as the signal launch point of choosing.Wherein, the said merging signal to noise ratio that obtains can be specially greater than set point: as satisfy the SNR level of the certain error rate of a certain specific transmission mode; For example with the 64QAM modulation system; Do not have coding, bit error rate is 0.1 o'clock, suppose transmission correspondence under the Gaussian channel-2dB.
In a kind of preferred embodiment of the present invention; The base station disposes a specific signal launch point as the reference point through high-level signaling; The signal to noise ratio of received signal launch point is pressed ordering from big to small; With all signal to noise ratios greater than the signal launch point of the signal to noise ratio of said reference point as the signal launch point of choosing, in the measuring process of reality, the base station can be selected different screening modes according to specific circumstances; And cooperate with other screening mode, be chosen at the qualified signal launch point below the said reference point.
The terminal is chosen own influential signal launch point according to concrete screening mode, and wherein, the signal launch point of choosing possibly be a signal source, also possibly be interference source.And said signal launch point fed back to the base station, and being specially, the terminal feeds back to the base station with the ID of selected signal launch point and the number of signal launch point.In specific embodiment of the present invention, the terminal can be carried out in the number of the ID of feedback signal launch point and signal launch point simultaneously, also can successively carry out; The number of for example first feedback signal launch point, the ID of the corresponding signal launch point of resource feedback is arranged in the base station then.According to the difference of feedback system, be divided into to the feedback of high-level signaling and to the feedback of physical layer schedule information.
Step 303, the job information that preserve according to base station side the base station is in conjunction with the metrical information of the preliminary feedback in terminal, for selecting suitable measurement hypothesis in the terminal.
In step 303, the base station is according to base station side known work information, and the ID of the signal launch point of combination terminal feedback, and the said number that satisfies pre-conditioned signal launch point, measures hypothesis for the terminal is provided with one or more.Wherein, said job information comprises schedule information that is used for scheduling of resource and the pre-configured scheduling parameter of base station side that base station side is preserved; Said measurement hypothesis comprises: the information of the signal launch point of choosing, the information of the signal launch point of definite state, and preferential CoMP mode of operation.
Under the situation that the scheduling of resource mode of part signal launch point has been confirmed, then this part signal launch point hereto the influence at terminal can confirm; For example it occupiedly is used for being another terminal service, and can not hold new terminal, is to disturb certainly for measuring terminals so just, and disturbs vector to confirm, can be used as and disturbs parameter to send to the terminal.The pre-configured scheduling parameter of base station side comprises the positional information of the signal launch point that base station side is preserved, coverage, and the emission under specific vector covers, information such as the logic connection of macrocell/Microcell.
In the mode of operation of CoMP, measure hypothesis for every kind and be applicable to the different working scene, in an embodiment of the present invention, through judging related unlike signal launch point possibly take place, the different measuring hypothesis is set:
When the number of the signal launch point of terminal feedback was 1, channel measurement was carried out according to single sub-district mode in the base station sets terminal;
When a plurality of signal launch point of base station selection, divide the concrete condition discussion,
When selected signal launch point belongs to three sectors of a sub-district, in the time of relatively partially or frequency deviation less than designated value, then the base station is that the preferential CoMP mode of operation of setting is: carry out channel measurement according to the JT mode in the measurement hypothesis that is provided with of terminal; Wherein, in an embodiment of the present invention, relative frequency deviation can be specified the JT mode less than in 5%.
When selected signal launch point belongs to different sites, in the time of relatively partially or frequency deviation greater than designated value, the base station is that the preferential CoMP mode of operation that the terminal is provided with is: carry out channel measurement according to the CS/CB mode.Wherein, in an embodiment of the present invention, relative frequency deviation can be specified the CS/CB mode greater than 5%.
In other embodiments of the invention, when the number of the signal launch point of base station feedback is greater than 4 the time, the base station is that the terminal is provided with, and carries out channel measurement according to the mode of grand branch collection.Because when the number of terminal feedback is greater than 4; Feedback information volume maybe be very big; To such an extent as to CoMP can not work; Can directly adopt the measurement hypothesis of grand branch collection emission, perhaps on relevant PRB resource, just not dispatch this terminal, temporarily abandon the measurement hypothesis new this terminal configuration.
When a plurality of launch points of a plurality of terminal feedback all are when being the peak signal launch point with the macro base station, the base station is that the preferential CoMP mode of operation that the terminal is provided with is: with the cell splitting gain is priority principle, closes the signal launch point of macro base station.Owing to all comprised the signal launch point of macro base station when a plurality of terminals; And the signal launch point of this macro base station is as main interference source the time; If these terminals distribute in different directions, can suppose preferentially that the transmitting power of macro base station closes, to obtain the cell splitting capacity gain; If these terminals are distributed on the roughly the same direction; Can preferentially suppose the wave beam forming direction is offseted this direction, avoid the service to other-end also being provided simultaneously in these terminal interference.
The base station can be that the terminal is provided with one or more measurement hypothesis according to actual conditions, does not receive the restriction in the foregoing description.
Step 304, base station are the CSI-RS resource that the signal launch point configuration chosen supplies the channel measurement real-time characteristic, and the measurement hypothesis that will dispose and corresponding C SI-RS configuration information of resource send to the terminal.
In step 304, the base station in conjunction with the known job information of base station side, is chosen the uncertain signal launch point of scheduling of resource mode according to the information of the signal launch point of terminal feedback in the signal launch point of terminal feedback.The all or part of channel parameter of the signal launch point of said uncertain scheduling of resource mode is not sure of and need be further measured the ability of obtaining extra metrical information and confirm.Wherein, the base station can confirm the scheduling of resource mode the information of signal launch point as the interference parameter that influences all the other terminals.Interference parameter is arranged in the measurement hypothesis, and informs the terminal.
After hypothesis is measured for each terminal is provided with one or more in the base station, said one or more measurement hypothesis and corresponding C SI-RS configuration information of resource are sent to the terminal.Wherein, In measurement hypothesis of sending and CSI-RS configuration information of resource, comprise: the mode of operation information of CoMP, the metrical information of the signal launch point that base station side is known, the state information of signal launch point on corresponding PRB to the terminal; The emission precoding vector information of signal launch point; The running parameter of the emission vector of signal launch point, the adjustment parameter of transmitting power, and other can be used for the parameter of detailed measurements channel; Like the detailed channel information at part terminal, the change information of signal launch point etc.
Step 305, the terminal remeasures channel status, and the metrical information that obtains is fed back to the base station according to the measurement hypothesis of new configuration on corresponding C SI-RS resource.
In step 305, the terminal obtains the channel condition information of the signal launch point of optimum capacity according to one or more measurement hypothesis of base station configuration in the further signal measurement operation of the enterprising row of CSI-RS resource that is disposed to the signal launch point of choosing.In an embodiment of the present invention; The terminal gets access to order designator (RI in carrying out again the channel measurement operation process; Rank Indicator)/precoding matrix indicators (PMI; Precoding Matrix Indicator)/CQI parameters such as (CQI, Channel Quality Indicator) and feed back to the base station.
The resource pre-scheduling is carried out according to the feedback information at terminal in the base station; If the metrical information of terminal feedback is not sure of the scheduling of resource mode; The base station repeats step 303～step 305, if the metrical information of terminal feedback can be confirmed the scheduling of resource mode, then execution in step 306; Through repeating step 303～305, through repeatedly duplicate measurements, progressively dwindle the scope of measuring hypothesis, can confirm the scheduling of resource mode up to the metrical information of terminal feedback; Promptly being chosen for the terminal provides till the signal launch point of service, and the metrical information of said signal launch point is fed back to the base station.
In other embodiments of the invention, can be through confirming earlier the measurement parameter at part terminal, and with these measurement parameters of confirming as the interference parameter that influences other-end, pass to associated terminal by the base station, progressively dwindle the hypothesis scope.
Step 306, base station are done final scheduling decision according to careful measured channel information, and arrange Physical Downlink Shared Channel PDSCH transmission.
In step 306, the base station is according to the detailed measurements information of terminal feedback, and obtaining one is the signal launch point that said terminal provides service, and the resource of PDSCH transmission is carried out in configuration on said signal launch point.
Fig. 4 is the work sketch map of many sub-districts under a kind of CoMP pattern among the present invention, and is as shown in Figure 4,
Have 5 launch points among the figure, macrocell A, macrocell B, and three Microcell m in macrocell A, Microcell n, Microcell k; Wherein macrocell is the configuration of 4 antenna ports, and Microcell is the configuration of 2 antenna ports, terminal double antenna.The configuration arrangement of R10CSI-RS resource is adopted in the base station, and macrocell A adopts 4 antenna port position configuration 1, and macrocell B adopts 4 antenna ports configuration 2; Three Microcell m, Microcell n, Microcell k adopt 2 antenna port position configuration 0 respectively; 5,10, the cycle is 50ms.
The first step: base station side is each the signal launch point configuration CSI-RS resource in this CoMP zone, carries out channel measurement, and the CSI-RS configuration information of resource is handed down to 1～terminal, terminal 7.
Second step: the CSI-RS resource allocation information that send according to the base station at 1～terminal, terminal 7; Each signal launch point is carried out channel measurement operation; Obtain the signal to noise ratio of each signal emission, sort, choose and satisfy pre-conditioned signal launch point and feed back to the base station according to the signal to noise ratio that gets access to; Wherein, the signal to noise ratio of all corresponding 5 launch points is detected at the terminal, and situation is distinguished as follows,
Terminal 1 feedback 4 antenna configurations port ones and 2 antenna ports configuration 0 belong to the set of the signal launch point that can exert an influence to oneself, and base station side is checked according to the ID of the CSI-RS resource in the CSI-RS resource allocation information of configuration should concern that obtaining is macrocell A and Microcell m;
In like manner, obtain the appreciable impact that terminal 2 receives macrocell A and Microcell n, terminal 3 receives macrocell A, the influence of B and Microcell k, and 4 at terminal receives the influence with macrocell A, 5 influences that receive macrocell B in terminal; Terminal 6, terminal 7 all receives the influence of macrocell A and macrocell B.Each terminal will be passed through the metrical information that preliminary surveying obtains and feed back to the base station.
The 3rd step: the signal launch point is chosen according to the feedback information and the known job information of base station side at terminal in the base station, and said measurement hypothesis and corresponding C SI-RS configuration information of resource are sent to the terminal.
Because Microcell m, Microcell n, the physical location information of Microcell k in advance can be at the base station side records; Microcell m is known in the base station; Microcell n, the roughly coverage of Microcell k can adopt and close emission or wave beam forming is avoided the regional interference to this place on the same direction of base station; Microcell k is because cost problem; Frequency characteristic is bad, and bigger with the distance time difference of macrocell, should not do the JT operation with macrocell B; And present situation is that the user density of sub-district A is bigger, and preferential selection can obtain the mode of cell capacity division gain.
The base station is that the terminal is provided with one or more measurement hypothesis according to selected signal launch point.Wherein,
Terminal 4, a signal launch point has been fed back at 5 at terminal, and then the measurement of configuration is assumed to be on the signal launch point that is fed back and carries out single cell measurement.
Macrocell A and macrocell B have all been fed back in terminal 6, terminal 7, and then the measurement of configuration is assumed to be the single cell measurement that carries out two sub-districts respectively, seeks their best precoding vectors separately.
When terminal 6 then, after the best precoding vector at terminal 7 is confirmed, with the information of the signal launch point of macro base station corresponding on terminal 6, the terminal 7 as influencing Microcell m; Microcell n, the interference parameter of the signal of Microcell k is then in the measurement hypothesis of new configuration; Terminal 4; The best at terminal 5 in advance coding vector to terminal 1, terminal 2, the transmission at terminal 3 then corresponding zero falls into direction.And determine terminal 6, the scheduling at terminal 7 and terminal 1, terminal 2 is not in the scheduling at terminal 3 is arranged at the same time.
With terminal 4, the best at terminal 5 coding vector in advance sends to other terminal as a part of measuring hypothesis, wherein; Be terminal 1; The measurement that terminal 2, terminal 3 dispose respectively is assumed to be respectively at Microcell m, Microcell n; Microcell k does single cell measurement, seek the terminal separately best precoding vector and obtain corresponding channel quality information.
In addition, be terminal 6, terminal 7 disposes other measurement hypothesis again and carries out multi-user JT pairing parameter measurement, and adopts the measurement hypothesis of optimum transmit vector to carry out Capacity Ratio separately with them, selects JT or CB mode to carry out work according to the capacity optimization criteria.
Up to the Channel Transmission mode of the best of confirming each signal launch point, confirm best resources employment methods.
In sum, the present invention at first arranges CSI-RS to carry out the channel measurement of long-time quality through the base station to each signal launch point, filters out part earlier to the influential signal launch point in terminal.Through confirming that which launch point may be influential, feed back to the base station, help the base station effectively to get rid of inappropriate working hypothesis according to actual conditions.Can reduce requirement, hold more launch point, help the enforcement of CoMP scheme configuration cycle.Progressively confirm working hypothesis through the base station; Carrying out real corresponding data channel transmitted again measures; Can effectively reduce the amount of calculation at terminal, reduce invalid number of computations, also reduce the burden of up-link wireless transmission simultaneously through the low working hypothesis that excludes the possibility.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.All any modifications of within spirit of the present invention and principle, being done, be equal to replacement, improvement etc., all be included in protection scope of the present invention.
Claims (10)
1. the channel measurement of a LTE and feedback method is characterized in that, this method is applicable to multi-point cooperative CoMP mode of operation, and this method comprises:
Step 1: the base station is each the signal launch point configurating channel state information measurement pilot frequency CSI-RS resource among the CoMP, and the CSI-RS configuration information of resource is sent to the terminal;
Step 2: the terminal is carried out channel measurement operation according to said CSI-RS configuration information of resource to each the signal launch point among the CoMP, sorts according to the signal to noise ratio that gets access to; Signal to noise ratio is satisfied pre-conditioned signal launch point feed back to the base station;
Step 3: the signal launch point is chosen according to the feedback information and the known job information of base station side at terminal in the base station, is that the terminal is provided with one or more measurement hypothesis and corresponding C SI-RS resource according to selected signal launch point; Said measurement hypothesis and corresponding C SI-RS configuration information of resource are sent to the terminal;
Step 4: further channel measurement is carried out according to said measurement hypothesis and corresponding C SI-RS resource in the terminal, and the metrical information of selected signal launch point is fed back to the base station; The resource pre-scheduling is carried out according to the feedback information at terminal in the base station, if the metrical information of terminal feedback is not sure of the scheduling of resource mode, the base station repeats step 3, if the metrical information of terminal feedback can be confirmed the scheduling of resource mode, then execution in step 5;
Step 5: scheduling of resource is carried out according to the scheduling of resource mode of confirming in the base station.
2. method according to claim 1 is characterized in that, saidly signal to noise ratio is satisfied pre-conditioned signal launch point feeds back to the base station and comprises:
Each signal launch point of being received is sorted by signal to noise ratio from big to small, is benchmark with the maximum signal to noise ratio, is chosen at the whole signal launch points in certain attenuation range;
Perhaps
Each signal launch point of being received is sorted by signal to noise ratio from big to small, is benchmark with the interference of the extra-regional signal launch point of corresponding CoMP, chooses the whole signal launch points that exceed certain power bracket;
Perhaps,
Each signal launch point of being received is sorted by signal to noise ratio from big to small, is benchmark with the maximum signal to noise ratio, with other signal launch point as interference source; From putting interference source under signal source one by one to weak by force, the signal to noise ratio after merging reaches a designated value by signal to noise ratio; Wherein, all the signal launch points in the signal source are the signal launch point of choosing;
Perhaps,
Each signal launch point of being received is sorted by signal to noise ratio from big to small, is benchmark with the maximum signal to noise ratio, with other signal launch point as interference source; By signal to noise ratio from putting interference source under signal source one by one to weak by force, up to the variable quantity that merges the signal to noise ratio operation for adjacent twice less than a designated value; Wherein, all the signal launch points in the signal source are the signal launch point of choosing;
The metrical information of selected signal launch point is fed back to the base station.
3. method according to claim 1 is characterized in that, saidly signal to noise ratio is satisfied pre-conditioned signal launch point feeds back to the base station and comprises:
The base station disposes a specific signal launch point as the reference point through high-level signaling; With the signal to noise ratio of received signal launch point by ordering from big to small, with all signal to noise ratios greater than the signal launch point of the signal to noise ratio of said reference point as the signal launch point of choosing.
4. method according to claim 3 is characterized in that, said metrical information with selected signal launch point feeds back to the base station and comprises:
The ID of pre-conditioned signal launch point will be satisfied in the terminal and the number of signal launch point feeds back to the base station.
5. method according to claim 4 is characterized in that, the ID that pre-conditioned signal launch point will be satisfied in said terminal feeds back to the base station and comprises:
The terminal feeds back to the base station with the ID of the CSI-RS resource that comprises in the pairing CSI-RS resource allocation information of selected signal launch point,
The base station is through the ID of the ID respective signal launch point of said CSI-RS resource.
6. method according to claim 1 is characterized in that, said base station is chosen the signal launch point and comprised according to the feedback information and the known job information of base station side at terminal:
The base station in conjunction with the known job information of base station side, is chosen the uncertain signal launch point of scheduling of resource mode according to the information of the signal launch point of terminal feedback in the signal launch point of terminal feedback.
7. method according to claim 1 is characterized in that, said measurement hypothesis comprises:
The information of the signal launch point of choosing, the information of the signal launch point of definite state, and preferential CoMP mode of operation.
8. method according to claim 7 is characterized in that, said is that the terminal is provided with one or more measurements hypothesis and comprises according to selected signal launch point:
When a plurality of signal launch point of base station selection,
When selected signal launch point belongs to three sectors of a sub-district, in the time of relatively partially or frequency deviation less than designated value, the base station is that the preferential CoMP mode of operation that the terminal is provided with is: carry out channel measurement according to the JT mode;
When selected signal launch point belongs to different sites, in the time of relatively partially or frequency deviation greater than designated value, the base station is that the preferential CoMP mode of operation that the terminal is provided with is: carry out channel measurement according to the CS/CB mode.
9. method according to claim 8 is characterized in that, said is that the terminal is provided with one or more measurements hypothesis and comprises according to selected signal launch point:
When a plurality of launch points of a plurality of terminal feedback all are with macro base station during for the strongest launch point, the base station is that the preferential CoMP mode of operation that the terminal is provided with is: with the cell splitting gain is priority principle, closes the signal launch point of macro base station.
10. method according to claim 9 is characterized in that, said is that the terminal is provided with one or more measurements hypothesis and comprises according to selected signal launch point:
The scheduling of resource mode of the part signal launch point of having confirmed when the base station, the information of the signal launch point that the base station will have been confirmed is provided with measurement and supposes as the interference parameter that influence all the other terminals.
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