CN103391573A - Downlink channel state information measuring method and device, and user equipment - Google Patents
Downlink channel state information measuring method and device, and user equipment Download PDFInfo
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Abstract
The invention is suitable for the technical field of wireless communication, and provides a downlink channel state information measuring method and device, and user equipment. The method comprises the steps that a plurality of TPs are synchronized, and M synchronization positions are obtained; the TPs are synchronized to the first optimum synchronization position; when resource management set information of channel state information reference signals sent by the service TPs is received, reported values of the CSI-RSs sent by all the TPs are measured according to the resource management set information; the TPs are synchronized to other sub-optimal synchronization positions, and according to the resource management set information, the reported values of the CSI-RSs sent by all the TPs are measured; the reported values, obtained at all the synchronization positions, corresponding to the maximum RSRQ corresponding to all the TPs are combined together to form a reported value of all the TPs. By means of the downlink channel state information measuring method and device, and the user equipment, CSI-RSs coming from other cells can be measured accurately.
Description
Technical field
The invention belongs to wireless communication technology field, relate in particular to a kind of method of measurement, device and subscriber equipment of downlink channel condition information.
Background technology
The development of the new generation of wireless communication technology, more and more higher to the requirement of efficiency of transmission.For example, with 3G(3G:3rd-Generation, 3G (Third Generation) Moblie) be the international mobile telecommunication of representative-2000(International Mobile Telecommunications-2000, IMT-2000) communication system, its spectrum efficiency requires to be up to 0.4 bits per second/Hz(bit per second, bps); And the 4th generation (4th-Generation, 4G) or accurate 4G be the international mobile telecommunication-senior (International Mobile Telecommunications-Advanced of representative, IMT-A) mobile communication system, its spectrum efficiency requires up to descending 15bps/Hz, and up is 6.75bps/Hz.In order to reach radio transmission efficiency so efficiently, a large amount of advanced technology are introduced in the IMT-A system, as in the LTE-A system, just introduced multi-user's multiple-input, multiple-output (Multi-μ ser Multiple-Input and Multiple-Output, MU-MIMO) technology, collaborative multiple spot (Coordinated Multiple Points, CoMP) technology.The introducing of these advanced technologies, greatly improved the spectrum efficiency of residential quarter.
Yet, in actual mobile communication system, obtain the technical advantage of above-mentioned ACT, many concrete system difficult points are arranged.One of them is exactly how channel condition information (Channel State Information, CSI) obtains.Especially, in the application of CoMP technology, service transmission point (Transmission Point, the more generally address of TP-residential quarter) need to be known the descending CSI of adjacent a plurality of subscriber equipmenies (User Equipment, UE) side.In the scene of reality, it is more difficult obtaining these CSI, more exists many problems to need to solve in standardized process.
One of them key issue is, as physical area number (the Physical CellIdentity of adjacent TP with service TP, when PCID) identical, service TP can be UE allocated channel state information reference signals (the Channel State Information – Reference Signal of CoMP to needs, CSI-RS), a plurality of TP that have identical PCID can distribute identical or different CSI-RS resource.In other words, a plurality of different service TP can send descending CSI-RS signal on identical or different CSI-RS resource; UE needs to measure descending CSI information from each TP according to these CSI-RS signals, uses as the foundation that realizes descending CoMP.But under this scene; signal from a plurality of TP can be superimposed; when the station spacing of different base station surpasses certain distance; the signal that different base station sends can surpass Cyclic Prefix (Cycle Prefix; CP) protection range and produce certain intersymbol interference; the UE that is synchronized to this moment under service TP can not carry out correct measurement to the descending CSI information from other TP according to the CSI-RS signal from other TP emission; thereby bring mistake or the deviation of measurement, these deviations will reduce the effect that realizes of even offsetting CoMP.
Prior art adopts the method that UE only is synchronized to current Serving cell to realize reducing mistake or the deviation of measurement, yet, it is accurately to the measurement of the CSI-RS signal of the residential quarter from current service that this method only can make UE, and to the measurement of the CSI-RS signal from other residential quarter, is inaccurate.Especially to pre-coding matrix indication (Precoding Matrix Indicator, PMI) and channel quality indication (Channel Quality Indication, CQI) selection there will be mistake or deviation, and is all influential to the implementation strategy of the selection of CoMP collection and CoMP.Finally can cause mobile radio system to spend the complexity of very large expense realization to work in coordination with and dispatch and but can not get corresponding gain, even make the mis-behave of mobile radio system.
Summary of the invention
The embodiment of the present invention provides a kind of method of measurement, device and subscriber equipment of downlink channel condition information, is intended to solve the measurement inaccurate problem of the subscriber equipment of prior art to the CSI-RS signal from other residential quarter.
On the one hand, provide a kind of method of measurement of downlink channel condition information, described method comprises:
A plurality of service launch point TP are carried out synchronously, obtain M sync bit, a described M sync bit be followed successively by the first optimal synchronisation position Pos0 and the good sync bit Pos1 of other time, Pos2 ..., PosM-1, the value of described M is not less than the size of collaborative multimetering collection, and described collaborative multimetering collection is the TP set for measurement and feedback of down channel state information;
Be synchronized to described the first optimal synchronisation position Pos0;
When receiving the channel state information reference signals CSI-RS resource management collection message of service TP transmission, according to described resource management collection message, measure the value of reporting of the CSI-RS of each TP transmission, the described value of reporting comprises Reference Signal Received Quality RSRQ, Reference Signal Received Power RSRP, pre-coding matrix indication PMI and channel quality indicator (CQI), and described resource management collection message is used to indicate TP corresponding to each CSI-RS and measures antenna port;
Be synchronized to successively the good sync bit Pos1 of other time, Pos2 ..., on PosM-1, according to described resource management collection message, the orthogonal frequency division multiplex OFDM symbol at the CSI-RS place that sends for described each TP carries out demodulation, to obtain CSI-RS corresponding to described each TP, then measure on CSI-RS corresponding to described each TP, obtain the value of reporting of the CSI-RS of described each TP transmission;
The value of reporting corresponding to the corresponding maximum RSRQ of each TP that all sync bits are measured combines, and forms the value of reporting of all TP.
On the other hand, provide a kind of measurement mechanism of downlink channel condition information, the measurement mechanism of described downlink channel condition information comprises:
The sync bit acquiring unit, be used for a plurality of service launch point TP are carried out synchronously, obtain M sync bit, a described M sync bit be followed successively by the first optimal synchronisation position Pos0 and the good sync bit Pos1 of other time, Pos2 ..., PosM-1, the value of described M is not less than the size of collaborative multimetering collection, and described collaborative multimetering collection is the TP set for measurement and feedback of down channel state information;
Resource management collection message sink unit, be used for being synchronized to described the first sync bit Pos0, judges whether each TP has sent CSI-RS resource management collection message, and described resource management collection message is used to indicate TP corresponding to each CSI-RS and measures antenna port;
Lock unit, be used for being synchronized to described the first optimal synchronisation position Pos0;
The first value of reporting measuring unit, be used for when receiving the channel state information reference signals CSI-RS resource management collection message of service TP transmission, according to described resource management collection message, measure the value of reporting of the CSI-RS of each TP transmission, the described value of reporting comprises Reference Signal Received Quality RSRQ, Reference Signal Received Power RSRP, pre-coding matrix indication PMI and channel quality indicator (CQI), and described resource management collection message is used to indicate TP corresponding to each CSI-RS and measures antenna port;
The second value of reporting measuring unit, be used for being synchronized to successively the good sync bit Pos1 of other time, Pos2 ..., on PosM-1, according to described resource management collection message, the orthogonal frequency division multiplex OFDM symbol at the CSI-RS place that sends for described each TP carries out demodulation, to obtain CSI-RS corresponding to described each TP, then measure on CSI-RS corresponding to described each TP, obtain the value of reporting of the CSI-RS of described each TP transmission;
The value of reporting creating unit, the value of reporting corresponding to the corresponding maximum RSRQ of each TP that is used for all sync bits are measured combines, and forms the value of reporting of all TP.
On the one hand, provide a kind of subscriber equipment again, described subscriber equipment comprises the measurement mechanism of downlink channel condition information as above.
in embodiments of the present invention, a plurality of service launch point TP are carried out synchronously, obtain M sync bit, first UE is synchronized to the first optimal synchronisation position of signal strength signal intensity maximum, measure one group of downlink channel condition information value of reporting, again UE is synchronized to the signal strength signal intensity time strong good sync bit of other time, measure many group downlink channel condition information values of reporting, then to same TP, select one group of value of reporting of RSRQ maximum to report service TP, can improve the certainty of measurement of the CSI-RS resource that each TP is ordered, can provide the optimum measurement result that each TP is ordered, reduced prior art to the value of reporting (RSRP, RSRQ, CQI, PMI) measurement mistake, and implementation complexity is low, precision is high, accurate measurement to the value of reporting has been arranged, can improve that the CoMP collection selects accuracy, indirectly improved power system capacity and handled up.
Description of drawings
Fig. 1 is the realization flow figure of the method for measurement of the downlink channel condition information that provides of the embodiment of the present invention one;
Fig. 2 is the application scenarios schematic diagram of the method for measurement of the downlink channel condition information that provides of the embodiment of the present invention one;
Fig. 3 is the schematic diagram that signal that the different TP of two of providing of the embodiment of the present invention 1 send arrives UE simultaneously;
Fig. 4 is 3 schematic diagrames that transmit and superpose in the UE side with different delay TP transmission that the embodiment of the present invention one provides;
Fig. 5 is near a plurality of relevant peaks schematic diagrames of not doing the secondary lobe processing of main peak that the embodiment of the present invention one provides;
Fig. 6 is near a plurality of relevant peaks schematic diagrames of having done the secondary lobe processing of main peak that the embodiment of the present invention one provides;
Fig. 7 is the structured flowchart of the measurement mechanism of the downlink channel condition information that provides of the embodiment of the present invention two.
Embodiment
, in order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
In embodiments of the present invention, a plurality of TP are carried out synchronously obtaining M sync bit; Be synchronized to again the first optimal synchronisation position, when each TP has sent CSI-RS resource management collection message, measure the value of reporting of the CSI-RS of each TP transmission; Be synchronized to again on the good sync bit of other time, according to described resource management collection message, the OFDM symbol at the CSI-RS place that sends for each TP carries out demodulation, obtain CSI-RS corresponding to described each TP, then measure on CSI-RS corresponding to described each TP, obtain the value of reporting of the CSI-RS of each TP transmission; The value of reporting corresponding to the corresponding maximum RSRQ of each TP that will measure finally combines, and forms the value of reporting of all TP.
Below in conjunction with specific embodiment, realization of the present invention is described in detail:
Embodiment one
Fig. 1 shows the realization flow of the method for measurement of the downlink channel condition information that the embodiment of the present invention one provides, and details are as follows:
At third generation partner program (3rd Generation Partnership Project, 3GPP) Long Term Evolution strengthens (Long Term Evolution-Advanced, LTE-A) (Release 11 for the 11st version, R11) in work sutdy process, the 4th kind of operative scenario proposed in the scene of CoMP, that is: the TP in the CoMP collection uses same frequency to send data, and the TP in the CoMP collection uses same PCID.Wherein, launch point TP can be far end radio frequency head (Remote Radio Head, RRH) or the Node B of evolution (evolved Node B, eNB), the application scenarios of concrete the method as shown in Figure 2, all RRH use low transmitting power, are connected by optical fiber between eNB and each RRH, and each RRH uses omnidirectional antenna.
(Orthogonal Frequency Division Multiplexing, the OFDM technology is the overloading technology on basis to the OFDM that is based on that the LTE-A wireless communication system uses.A common feature of this technology is to use Cyclic Prefix (Cycle Prefix, CP), and the basic role of CP technology is to protect under the condition that the multipath expansion is arranged, and the signal energy that multipath expands can not disturbed the data on adjacent OFDM symbol.The length of CP need to be greater than the time delay expansion of long multipath.Yet scene 4 times, as shown in Figure 3, the signal of the TP of 2 different distance emission arrives the UE side simultaneously, and the UE side can receive from the signal after the mutual stack of 2 TP.
When scene 4 times, the PCID of these 2 TP is identical, this means, all parameters relevant with the PCID configuration all can be identical, comprise: identical from the synchronizing signal of this 2 TP (master sync signal (Primary Synchronization Signal, PSS), from synchronizing signal (Second Synchronization Signal, SSS)), (Cell-specific reference signals, CRS) is identical for the specific reference signal in residential quarter.This identical, meaning that the UE side is difficult to will be from the signal distinguishing of this two TP out, when the data that send to UE as these two TP are identical, can obtain Single Frequency Network and merge gain, the data that send to UE as these two TP are not simultaneously, the data (CoMP transmission) that need collaborative these two TP to send to UE, otherwise will produce co-channel interference.
Therefore, how carrying out corresponding operating, with the TP that transmits control message to UE, provide enough information, is a key issue with the selection that realizes the CoMP mode.Because CRS is identical, so the UE side can not be done for different TP on CRS CSI estimates.The estimation that need to do based on CSI-RS comprises: the measurement of signal strength signal intensity, Reference Signal Received Power (Reference Signal Received Power for example, RSRP), Reference Signal Received Quality (Reference Signal Received Quality, RSRQ), the calculating of descending best precoding PMI, the calculating of downlink channel quality indicator (CQI).These measurements and calculations are to the requirement of synchronization accuracy very high (the especially calculating of PMI).
In the research on standard of R11, propose to configure a plurality of CSI-RS by service TP to UE at present, coordinate between TP, so that different TP sends different CSI-RS.And service TP can control (Radio Resource Control by the specific Radio Resource of UE, RRC) signaling is told UE which has configured and is planted CSI-RS to UE, so that the CSI-RS that UE can receive according to oneself measures and estimates downlink channel condition information.
As shown in Figure 3, be the schematic diagram that two different TP signals arrive UE simultaneously, when there was certain station spacing in two TP, two next signals of TP can be superimposed in the UE side in the mode of a fixed response time.Its effect as shown in Figure 4.
Suppose UE synchronously on the strongest position of the multipath signal of TP3,, due to the relative transmission time delay difference (station spacing generation) between TP2 and TP3 and TP1 and TP3, can produce following problem this moment:
1, within UE has been synchronized to the CP scope of TP2, correctly demodulation TP2 is to the data of UE, but is not synchronized on the optimum position of TP2, if when therefore UE is synchronized to the data of demodulation TP2 on the position of TP3, exist synchronism deviation to need to correct.
2, the data that transmit from TP1, sync bit have been got the data of former and later two symbols, for the demodulation of TP1, are not realize synchronously, and have intersymbol interference.
3, the data of asynchronous TP1 also can produce interference to the data that UE receives TP2 and TP3.
4, because the PCID of 3 TP is identical, even UE is synchronized to above TP3, but UE also and do not know this point.In other words, when UE knew the configuration of 3 different CSI-RS, it did not also know which CSI-RS configures the transfer point of corresponding which reality, so also can't correct synchronous deviation by the resource of CSI-RS.
Therefore, scene 4 times, we need to design a kind of method, with guarantee UE can based on a plurality of CSI-RS resources of distributing can be correct calculate the various measurement report information that UE need to feed back.
The situation of different station spacing TP propagation delay times greater than the CP protection is described below for an example.We know that the length of LTE-A system Normal CP is respectively the 1st OFDM symbol in 5.21 each subframe of μ s() and 4.69 each subframe of μ s(in other OFDM symbol); corresponding time delay size is 10 μ s and station spacing is 3km; the time delay size that 2km is corresponding is 6.67 μ s; and these two kinds of configurations all likely occur, this moment, corresponding time delay was all greater than the protection length of CP.
In step S101, a plurality of service launch point TP are carried out synchronously, obtain M sync bit, a described M sync bit be followed successively by the first optimal synchronisation position Pos0 and the good sync bit Pos1 of other time, Pos2 ..., PosM-1, the value of described M is not less than the size of collaborative multimetering collection, described collaborative multimetering collection is that the measurement parameter of described downlink channel condition information comprises pre-coding matrix indication PMI and channel quality indicator (CQI) for the TP set of measuring and feeding back described downlink channel condition information.
In the present embodiment, when user equipment (UE) is synchronized to described the first optimal synchronisation position Pos0, represent that UE has been synchronized on the TP that signal is a strongest point.
Wherein, collaborative multimetering collection is the TP set of carrying out PMI, CQI, RI measurement and feedback, in this set the inside, comprises a plurality of TP.UE need to measure each TP of this set the inside, and feeds back PMI, the CQI of above-mentioned indication and the measurement result of RI.Measurement to each TP is carried out on the CSI-RS resource, which measuring set a plurality of TP in measuring set, distributed, and is that network passes through the RRC signaling to UE.
Wherein, can realize that a plurality of service launch point TP's is synchronous by two kinds of methods.
First method can be carried out synchronously a plurality of TP by the master sync signal PSS in synchronous channel SCH.
Concrete, by the master sync signal PSS in synchronous channel SCH, a plurality of TP are carried out synchronous process and be:
The CSI-RS of step 11, search signal intensity maximum.
Step 12, be synchronized to the CSI-RS of described signal strength signal intensity maximum by the Cell searching algorithm, and sync bit is labeled as Pos0.
Concrete, UE presses the Cell searching algorithm and realizes synchronous to one of them the strongest CSI-RS signal, the sign of synchronously completing is that the demodulation of Physical Broadcast Channel (Physical Broadcast Channel, PBCH) is correct, and with the strongest position mark, is Pos0.
Wherein, the Cell searching algorithm is prior art, and the implementation of specific algorithm comprises the following steps:
Step 1: carry out the detection of main synchronizing sequence;
Step 2: carry out the detection from synchronizing sequence;
Step 3: the master and slave synchronizing sequence that detects by step 1,2 calculates cell ID, then carry out the detection of Physical Broadcast Channel by the cell ID that detects, if Physical Broadcast Channel detects successfully, cell search process is completed, otherwise failure, need to carry out in new position the detection again of above-mentioned 3 steps.
After Cell searching is completed, UE can obtain following information: CP type, System Frame Number and the subframe numbers of Physical Cell Identifier, accurate sync bit, mobile radio system, wherein, the starter system message that comprises in Physical Broadcast Channel comprises system bandwidth etc.
After completing the Cell searching algorithm, the access mobile radio system that UE could be correct, also could calculate and really find the Time and Frequency Synchronization point that can work.
Step 13, choose L correlation corresponding to sampled point do repeatedly peak value joint-detection before and after described Pos0, obtain the inferior strong peak of M-1 signal strength signal intensity, the numerical value of L is the number of the corresponding sampled point of maximum traffic delay time that brings of station spacing.
In the present embodiment, first choose L correlation corresponding to sampled point before and after Pos0 and do a minor peaks joint-detection, near the main peak that obtains a plurality of correlation peak (local maximums, than adjacent continuous several values in front and back all large value be called peak value), these peak values are the secondary lobe of peak value not to be done the result that zero setting is processed, as shown in Figure 5, be near a plurality of schematic diagrames of not doing the relevant peaks of secondary lobe processing of main peak; The peak value of the default number in the correlation that L sampled point is corresponding keeps again, the secondary lobe on peak value side (with continuous a plurality of lower than peak value value adjacent before and after peak value) zero setting.Repeat above-mentioned step, do continuously N minor peaks joint-detection (as 4 times), obtain M-1 time strong peak, as shown in Figure 6, near a plurality of relevant peaks schematic diagrames of having done the secondary lobe processing main peak.
As a preferred embodiment of the present invention, the criterion that keeps as inferior strong peak is in N time continuous detection, occurrence number to be surpassed prominent M-1 position of thresholding (as 2 times) number of times as time strong peak.
Concrete, the magnitude value of L depends on the sampling bandwidth on the maximum station spacing under scene 4 of mobile communication system definition and the synchronizing channel when synchronous.Take the distance between sites of 3km as example, corresponding time delay is 10 μ s, if the baseband bandwidth during the PSS channel synchronization is 1.92MHz, corresponding L value is 19.2,, by rounding up, is 20.Corresponding L value corresponding to 2km station spacing is 13.Be in this example, need to get L(3km correspondence 20,2km correspondence 13 before and after the Pos0) correlation peak that individual sampled point is corresponding, the numerical value of L is the number of the corresponding sampled point of maximum traffic delay time that station spacing brings.
Step 14, peak that a described M-1 signal strength signal intensity is time strong be as inferior good sync bit, be labeled as respectively Pos1, Pos2 ..., PosM-1.
The concrete implementation of second method is:
Step 21, by the Cell searching algorithm, obtain the first sync bit Pos0.
Step 22, centered by described the first sync bit Pos0, front and back are the step-length Lx of mobile default number respectively, obtains other sync bit of default number, wherein, the numerical value of step-length Lx is less than cyclic prefix CP length.
In the present embodiment, default specific step-length Lx,, to the forward and backward step-length Lx of mobile default number respectively, can obtain a plurality of better sync bits centered by Pos0.Be Pos1=Pos0-Lx, Pos2=Pos0+Lx, Pos3=Pos0-2Lx, Pos3=Pos0+2Lx.
The number of the position of choosing cyclic prefix CP length simultaneously and getting before and after Pos0 of Lx value, as under the station spacing of 2km, the Lx value can be the CP length of 0.8 times, principle is that Lx is preferably less than the length of CP.
In step S102, be synchronized to described the first optimal synchronisation position Pos0, when receiving the channel state information reference signals CSI-RS resource management collection message of service TP transmission, execution step S103, otherwise, end not carry out follow-up step, wherein, described resource management collection message is used to indicate TP corresponding to each CSI-RS and measures antenna port.
Wherein, subscriber equipment judges whether to receive according to the data that receive from service TP the CSI-RS resource management collection message that service TP sends, and concrete deterministic process is:
first from the extracting data that receives, go out business datum, and described business datum is carried out demodulation, obtain the specific radio resource control RRC signaling of user, again described RRC signaling is carried out demodulation, detect the resource management collection message that whether comprises the relevant CSI-RS that sends to UE in described RRC signaling, if, represent that UE receives the CSI-RS resource management collection message that service TP sends, if not, represent that the service TP in wireless communication system is not a plurality of CSI-RS resources of UE configuration, that is expression UE is operated in and does not need to report under the pattern of multiple spot CSI by CSI-RS, therefore do not need to carry out subsequent step of the present invention, otherwise, execution step S103.
Present above-mentioned state is that conclusion has been reached in LTE-A Rel-11 meeting, and the field of RRC signaling and content do not form corresponding standard.The content of relevant CSI-RS resource management collection message is clear and definite, comprises following content:
Carry out the initial cell identification information (being labeled as X) of the sequence scrambler initialization needs of CSI-RS reference signal generation, the CSI-RS port numbers, the CSI-RS number of resources, the configuration of each CSI-RS resource (comprising the configuration of subframe deviant, CSI-RS occurs in subframe OFDM character position and the configuration of the frequency location in RB).
In step S103, according to described resource management collection message, measure the value of reporting of the CSI-RS of each TP transmission, the described value of reporting comprises Reference Signal Received Quality RSRQ, Reference Signal Received Power RSRP, pre-coding matrix indication PMI and channel quality indicator (CQI).
In the present embodiment,, first according to described resource management collection message, measure the RSRQ of the CSI-RS of each TP transmission, obtain the one-shot measurement result.As shown in table 1, wherein X1 represents to distribute to the wherein CSI-RS sequence number of 1 TP (parameter in the initial scrambler value of the scrambler sequence that corresponding CSI-RS uses), antennaPortsCount1 distributes to the wherein antenna port number of 1 TP antenna, suppose the CSI-RS that obtains signal quality best for the corresponding TP of X1.
| CSI-RS sequence number (corresponding TPs) | The CSI-RS signal quality |
| (X1，antennaPortsCount1） | RSRQ01 |
| （X2,antennaPortsCount2） | RSRQ02 |
| （X3,antennaPortsCount3） | RSRQ03 |
Table 1
Again Xi(each TP in a CoMP collection corresponding to the RSRQ of maximum had Xi correspondence with it) the corresponding present best launch point TP of CSI-RS conduct, carry out essence synchronously with CSI-RS corresponding to this TP, obtaining the second synchronous optimal synchronisation position of essence is Pos0 '; Wherein, described essence synchronously means higher synchronous of precision, is synchronous in step S101, this is subsynchronous be choose that CSI-RS on the maximum TP of RSRQ value carries out synchronously, so compare with step S101 in the precision of the sync bit that obtains higher, so it is synchronous to be referred to as essence.
Be synchronized to described the second optimal synchronisation position Pos0 ', measure the value of reporting of the CSI-RS of each TP transmission, obtain one group of measurement result, as shown in table 2.
Table 2
In step S104, be synchronized to successively the good sync bit Pos1 of other time, Pos2 ..., on PosM-1, according to described resource management collection message, the orthogonal frequency division multiplex OFDM symbol at the CSI-RS place that sends for described each TP carries out demodulation, to obtain CSI-RS corresponding to described each TP, then measure on CSI-RS corresponding to described each TP, obtain the value of reporting of the CSI-RS of described each TP transmission.
In the present embodiment, first UE is synchronized to the good sync bit Pos1 of other time, Pos2 ..., on PosM-1, according to described resource management collection message, the orthogonal frequency division multiplex OFDM symbol at the CSI-RS place that sends for each TP carries out demodulation, to obtain CSI-RS corresponding to described each TP, then measure on CSI-RS corresponding to described each TP, obtain the RSRQ (similar with table 1, the result of just measuring is different) of each TP; Again to same TP, relatively be synchronized to the RSRQ whether RSRQ that measures on other sync bit measure when being synchronized to the first optimal synchronisation position Pos0 or the second optimal synchronisation position Pos0 ' large; If so, to CSI-RS corresponding to described TP carry out essence synchronous after, then measure the value of reporting of the CSI-RS that described TP sends, if not, perform step S105.
In step S105, the value of reporting corresponding to the corresponding maximum RSRQ of each TP that all sync bits are measured combines, and forms the value of reporting of all TP, and reports service TP.
the present embodiment, a plurality of service launch point TP are carried out synchronously, obtain M sync bit, first UE is synchronized to the first optimal synchronisation position of signal strength signal intensity maximum, measure one group of downlink channel condition information value of reporting, again UE is synchronized to the signal strength signal intensity time strong good sync bit of other time, measure many group downlink channel condition information values of reporting, then to same TP, select one group of value of reporting of RSRQ maximum to report service TP, can improve the certainty of measurement of the CSI-RS resource that each TP is ordered, can provide the optimum measurement result that each TP is ordered, reduced prior art to the value of reporting (RSRP, RSRQ, CQI, PMI) measurement mistake, and implementation complexity is low, precision is high, accurate measurement to the value of reporting has been arranged, can improve that the CoMP collection selects accuracy, indirectly improved power system capacity and handled up.
Embodiment two
Fig. 7 shows the structured flowchart of the measurement mechanism of the downlink channel condition information that the embodiment of the present invention two provides, in the present embodiment, this device can be the unit of software unit, hardware cell or software and hardware combining in subscriber equipment, described subscriber equipment can form wireless communication system with base station and a plurality of launch point TP, and described device comprises: sync bit acquiring unit 71, lock unit 72, the first value of reporting measuring unit 73, the second value of reporting measuring unit 74 and the value of reporting creating unit 75.
Wherein, sync bit acquiring unit 71, be used for a plurality of service launch point TP are carried out synchronously, obtain M sync bit, a described M sync bit be followed successively by the first optimal synchronisation position Pos0 and the good sync bit Pos1 of other time, Pos2 ..., PosM-1, the value of described M is not less than the size of collaborative multimetering collection, described collaborative multimetering collection is that the measurement parameter of described downlink channel condition information comprises pre-coding matrix indication PMI and channel quality indicator (CQI) for the TP set of measuring and feeding back described downlink channel condition information;
The first value of reporting measuring unit 73, be used for when receiving the channel state information reference signals CSI-RS resource management collection message of service TP transmission, according to described resource management collection message, measure the value of reporting of the CSI-RS of each TP transmission, the described value of reporting comprises Reference Signal Received Quality RSRQ, Reference Signal Received Power RSRP, pre-coding matrix indication PMI and channel quality indicator (CQI), and described resource management collection message is used to indicate TP corresponding to each CSI-RS and measures antenna port;
The second value of reporting measuring unit 74, be used for being synchronized to successively the good sync bit Pos1 of other time, Pos2 ..., on PosM-1, according to described resource management collection message, the orthogonal frequency division multiplex OFDM symbol at the CSI-RS place that sends for described each TP carries out demodulation, to obtain CSI-RS corresponding to described each TP, then measure on CSI-RS corresponding to described each TP, obtain the value of reporting of the CSI-RS of described each TP transmission;
The value of reporting creating unit 75, the value of reporting corresponding to the corresponding maximum RSRQ of each TP that is used for all sync bits are measured combines, and forms the value of reporting of all TP.
In addition, the measurement mechanism of downlink channel condition information also comprises: message judging unit, this message judging unit are used for judging whether to receive the CSI-RS resource management collection message that service TP sends.
Concrete, described message judging unit comprises: signaling extraction module and signaling detection module.
Wherein, the signaling extraction module, be used for going out business datum from the extracting data that receives, and described business datum carried out demodulation, obtains the specific radio resource control RRC signaling of user;
The signaling detection module, be used for described RRC signaling is carried out demodulation, detects in described RRC signaling and whether comprise the relevant CSI-RS resource management collection message that sends to UE, if so, represents that UE receives the CSI-RS resource management collection message that service TP sends.
Concrete, described the first value of reporting measuring unit 73 comprises: a RSRQ measurement module, smart sync bit acquisition module and the first value of reporting measurement module.
Wherein, a RSRQ measurement module, be used for according to described resource management collection message, measures the RSRQ of the CSI-RS of each TP transmission;
Essence sync bit acquisition module, be used for CSI-RS corresponding to the RSRQ of maximum carried out essence synchronously, obtains the second optimal synchronisation position Pos0 ';
The first value of reporting measurement module, be used for being synchronized to described the second optimal synchronisation position Pos0 ', measures the value of reporting of the CSI-RS of each TP transmission.
Concrete, described the second value of reporting measuring unit 74 comprises: CSI-RS acquisition module, the 2nd RSRQ measurement module and the second value of reporting measurement module.
Wherein, the CSI-RS acquisition module, be used for according to described resource management collection message, and the orthogonal frequency division multiplex OFDM symbol at the CSI-RS place that sends for each TP carries out demodulation, to obtain CSI-RS corresponding to described each TP;
The 2nd RSRQ measurement module, be used for measuring on CSI-RS corresponding to described each TP, obtains the RSRQ of described each TP;
The second value of reporting measurement module, be used for same TP, if it is large to be synchronized to the RSRQ that measures when the RSRQ ratio that measures on other sync bit is synchronized to the first optimal synchronisation position Pos0 or the second optimal synchronisation position Pos0 ', to CSI-RS corresponding to described TP carry out essence synchronous after, then measure the value of reporting of the CSI-RS that described TP sends.
Concrete, described sync bit acquiring unit 71 carries out synchronously a plurality of TP by the master sync signal PSS in synchronous channel SCH, and described sync bit acquiring unit 71 comprises: signal search module, the first optimal synchronisation position acquisition module, peak acquisition module and best placement acquisition module for the first time.
Wherein, the signal search module, for the CSI-RS of search signal intensity maximum;
The first optimal synchronisation position acquisition module, be used for being synchronized to the CSI-RS of described signal strength signal intensity maximum by the Cell searching algorithm, and sync bit be labeled as Pos0;
The peak acquisition module, be used for choosing L correlation corresponding to sampled point before and after described Pos0 and do repeatedly peak value joint-detection, obtain M-1 signal strength signal intensity time strong peak, the numerical value of L is the number of the corresponding sampled point of maximum traffic delay time that brings of station spacing;
Best placement acquisition module for the first time, be used for the peak that a described M-1 signal strength signal intensity is time strong as inferior good sync bit, be labeled as respectively Pos1, Pos2 ..., PosM-1.
Concrete, a described M-1 signal strength signal intensity time strong peak is in continuous repeatedly peak value joint-detection, occurrence number surpasses M-1 the signal strength signal intensity time strong peak of default thresholding number of times.
Concrete, described peak acquisition module is the peak value reservation of the default number in correlation that a described L sampled point is corresponding, the secondary lobe zero setting on peak value side.
Concrete, described sync bit acquiring unit 71 also comprises: the second optimal synchronisation position acquisition module and best placement acquisition module for the second time.
Wherein, the second optimal synchronisation position acquisition module, be used for obtaining the first sync bit Pos0 by the Cell searching algorithm;
The best placement acquisition module, be used for centered by described the first sync bit Pos0 for the second time, and front and back are the step-length Lx of mobile default number respectively, obtains other sync bit of default number, and wherein, the numerical value of step-length Lx is less than cyclic prefix CP length.
The subscriber equipment that the embodiment of the present invention provides can be applied in the embodiment of the method one of aforementioned correspondence, and details are described referring to above-described embodiment one, do not repeat them here.
It should be noted that in said system embodiment, included unit is just divided according to function logic, but is not limited to above-mentioned division, as long as can realize corresponding function; In addition, the concrete title of each functional unit also, just for the ease of mutual differentiation, is not limited to protection scope of the present invention.
In addition, one of ordinary skill in the art will appreciate that all or part of step that realizes in the various embodiments described above method is to come the relevant hardware of instruction to complete by program, corresponding program can be stored in a computer read/write memory medium, described storage medium, as ROM/RAM, disk or CD etc.
The foregoing is only preferred embodiment of the present invention,, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (21)
1. the method for measurement of a downlink channel condition information, is characterized in that, described method comprises:
A plurality of service launch point TP are carried out synchronously, obtain M sync bit, a described M sync bit be followed successively by the first optimal synchronisation position Pos0 and the good sync bit Pos1 of other time, Pos2 ..., PosM-1, the value of described M is not less than the size of collaborative multimetering collection, and described collaborative multimetering collection is for the TP set of measuring and feeding back described downlink channel condition information;
Be synchronized to described the first optimal synchronisation position Pos0;
When receiving the channel state information reference signals CSI-RS resource management collection message of service TP transmission, according to described resource management collection message, measure the value of reporting of the CSI-RS of each TP transmission, the described value of reporting comprises Reference Signal Received Quality RSRQ, Reference Signal Received Power RSRP, pre-coding matrix indication PMI and channel quality indicator (CQI), and described resource management collection message is used to indicate TP corresponding to each CSI-RS and measures antenna port;
Be synchronized to successively the good sync bit Pos1 of other time, Pos2 ..., on PosM-1, according to described resource management collection message, the orthogonal frequency division multiplex OFDM symbol at the CSI-RS place that sends for described each TP carries out demodulation, to obtain CSI-RS corresponding to described each TP, then measure on CSI-RS corresponding to described each TP, obtain the value of reporting of the CSI-RS of described each TP transmission;
The value of reporting corresponding to the corresponding maximum RSRQ of each TP that all sync bits are measured combines, and forms the value of reporting of all TP.
2. the method for claim 1, is characterized in that, according to described resource management collection message, before measuring the value of reporting of the CSI-RS that each TP sends, described method also comprises:
Judge whether to receive the CSI-RS resource management collection message that service TP sends.
3. method as claimed in claim 2, is characterized in that, describedly judges whether to receive the CSI-RS resource management collection message that service TP sends and specifically comprise:
Go out business datum from the extracting data that receives, and described business datum is carried out demodulation, obtain the specific radio resource control RRC signaling of user;
Described RRC signaling is carried out demodulation, detect in described RRC signaling and whether comprise CSI-RS resource management collection message, if so, expression receives the CSI-RS resource management collection message that service TP sends.
4. the method for claim 1, is characterized in that, and is described according to described resource management collection message, and the value of reporting that measures the CSI-RS of each TP transmission comprises:
, according to described resource management collection message, measure the RSRQ of the CSI-RS of each TP transmission;
CSI-RS corresponding to the RSRQ of maximum carried out essence synchronously, obtain the second optimal synchronisation position Pos0 ';
Be synchronized to described the second optimal synchronisation position Pos0 ', measure the value of reporting of the CSI-RS of each TP transmission.
5. the method for claim 1, it is characterized in that, described according to described resource management collection message, the orthogonal frequency division multiplex OFDM symbol at the CSI-RS place that sends for described each TP carries out demodulation, to obtain CSI-RS corresponding to described each TP, then measure on CSI-RS corresponding to described each TP, the value of reporting that obtains the CSI-RS of described each TP transmission comprises:
According to described resource management collection message, the orthogonal frequency division multiplex OFDM symbol at the CSI-RS place that sends for each TP carries out demodulation, to obtain CSI-RS corresponding to described each TP;
Measure on CSI-RS corresponding to described each TP, obtain the RSRQ of described each TP;
To same TP, if it is large to be synchronized to the RSRQ that measures when the RSRQ ratio that measures on other sync bit is synchronized to the first optimal synchronisation position Pos0 or the second optimal synchronisation position Pos0 ', to CSI-RS corresponding to described TP carry out essence synchronous after, then measure the value of reporting of the CSI-RS that described TP sends.
6. the method for claim 1, is characterized in that, described a plurality of service launch point TP carried out synchronously obtaining M sync bit, be followed successively by the first optimal synchronisation position Pos0 and the good sync bit Pos1 of other time, Pos2 ..., PosM-1 specifically comprises:
By the master sync signal PSS in synchronous channel SCH, a plurality of TP are carried out synchronously.
7. method as claimed in claim 6, is characterized in that, describedly by the master sync signal PSS in synchronous channel SCH, a plurality of TP synchronously specifically comprised:
The CSI-RS of search signal intensity maximum;
Be synchronized to the CSI-RS of described signal strength signal intensity maximum by the Cell searching algorithm, and sync bit is labeled as Pos0;
Choose L correlation corresponding to sampled point and do repeatedly peak value joint-detection before and after described Pos0, obtain the inferior strong peak of M-1 signal strength signal intensity, the numerical value of L is the number of the corresponding sampled point of maximum traffic delay time that brings of station spacing;
The peak that a described M-1 signal strength signal intensity is time strong is as inferior good sync bit, be labeled as respectively Pos1, Pos2 ..., PosM-1.
8. method as claimed in claim 7, is characterized in that, a described M-1 signal strength signal intensity time strong peak is in continuous repeatedly peak value joint-detection, and occurrence number surpasses M-1 the signal strength signal intensity time strong peak of default thresholding number of times.
9. method as claimed in claim 7, is characterized in that, describedly chooses L correlation corresponding to sampled point do repeatedly peak value joint-detection and be specially before and after described Pos0:
The peak value of the default number in the correlation that a described L sampled point is corresponding keeps, the secondary lobe zero setting on peak value side.
10. the method for claim 1, is characterized in that, described a plurality of service launch point TP carried out synchronously obtaining M sync bit, be followed successively by the first sync bit Pos0 and other sync bit Pos1, Pos2 ..., PosM-1 is specially:
, by the Cell searching algorithm, obtain the first sync bit Pos0;
Centered by described the first sync bit Pos0, front and back are the step-length Lx of mobile default number respectively, obtains other sync bit of default number, and wherein, the numerical value of step-length Lx is less than cyclic prefix CP length.
11. the measurement mechanism of a downlink channel condition information, is characterized in that, described device comprises:
The sync bit acquiring unit, be used for a plurality of service launch point TP are carried out synchronously, obtain M sync bit, a described M sync bit be followed successively by the first optimal synchronisation position Pos0 and the good sync bit Pos1 of other time, Pos2 ..., PosM-1, the value of described M is not less than the size of collaborative multimetering collection, and described collaborative multimetering collection is for the TP set of measuring and feeding back described downlink channel condition information;
Lock unit, be used for being synchronized to described the first optimal synchronisation position Pos0;
The first value of reporting measuring unit, be used for when receiving the channel state information reference signals CSI-RS resource management collection message of service TP transmission, according to described resource management collection message, measure the value of reporting of the CSI-RS of each TP transmission, the described value of reporting comprises Reference Signal Received Quality RSRQ, Reference Signal Received Power RSRP, pre-coding matrix indication PMI and channel quality indicator (CQI), and described resource management collection message is used to indicate TP corresponding to each CSI-RS and measures antenna port;
The second value of reporting measuring unit, be used for being synchronized to successively the good sync bit Pos1 of other time, Pos2 ..., on PosM-1, according to described resource management collection message, the orthogonal frequency division multiplex OFDM symbol at the CSI-RS place that sends for described each TP carries out demodulation, to obtain CSI-RS corresponding to described each TP, then measure on CSI-RS corresponding to described each TP, obtain the value of reporting of the CSI-RS of described each TP transmission;
The value of reporting creating unit, the value of reporting corresponding to the corresponding maximum RSRQ of each TP that is used for all sync bits are measured combines, and forms the value of reporting of all TP.
12. the measurement mechanism of downlink channel condition information as claimed in claim 11, is characterized in that, described device also comprises:
The message judging unit, be used for judging whether to receive the CSI-RS resource management collection message that service TP sends.
13. the measurement mechanism of downlink channel condition information as claimed in claim 12, is characterized in that, described message judging unit comprises:
The signaling extraction module, be used for going out business datum from the extracting data that receives, and described business datum carried out demodulation, obtains the specific radio resource control RRC signaling of user;
The signaling detection module, be used for described RRC signaling is carried out demodulation, detects in described RRC signaling and whether comprise CSI-RS resource management collection message, and if so, expression receives the CSI-RS resource management collection message that service TP sends.
14. the measurement mechanism of downlink channel condition information as claimed in claim 11, is characterized in that, described the first value of reporting measuring unit comprises:
The one RSRQ measurement module, be used for according to described resource management collection message, measures the RSRQ of the CSI-RS of each TP transmission;
Essence sync bit acquisition module, be used for CSI-RS corresponding to the RSRQ of maximum carried out essence synchronously, obtains the second optimal synchronisation position Pos0 ';
The first value of reporting measurement module, be used for being synchronized to described the second optimal synchronisation position Pos0 ', measures the value of reporting of the CSI-RS of each TP transmission.
15. the measurement mechanism of downlink channel condition information as claimed in claim 11, is characterized in that, described the second value of reporting measuring unit comprises:
The CSI-RS acquisition module, be used for according to described resource management collection message, and the orthogonal frequency division multiplex OFDM symbol at the CSI-RS place that sends for each TP carries out demodulation, to obtain CSI-RS corresponding to described each TP;
The 2nd RSRQ measurement module, be used for measuring on CSI-RS corresponding to described each TP, obtains the RSRQ of described each TP;
The second value of reporting measurement module, be used for same TP, if it is large to be synchronized to the RSRQ that measures when the RSRQ ratio that measures on other sync bit is synchronized to the first optimal synchronisation position Pos0 or the second optimal synchronisation position Pos0 ', to CSI-RS corresponding to described TP carry out essence synchronous after, then measure the value of reporting of the CSI-RS that described TP sends.
16. the measurement mechanism of downlink channel condition information as claimed in claim 11, is characterized in that, described sync bit acquiring unit carries out synchronously a plurality of TP by the master sync signal PSS in synchronous channel SCH.
17. the measurement mechanism of downlink channel condition information as claimed in claim 16, is characterized in that, described sync bit acquiring unit comprises:
The signal search module, for the CSI-RS of search signal intensity maximum;
The first optimal synchronisation position acquisition module, be used for being synchronized to the CSI-RS of described signal strength signal intensity maximum by the Cell searching algorithm, and sync bit be labeled as Pos0;
The peak acquisition module, be used for choosing L correlation corresponding to sampled point before and after described Pos0 and do repeatedly peak value joint-detection, obtain M-1 signal strength signal intensity time strong peak, the numerical value of L is the number of the corresponding sampled point of maximum traffic delay time that brings of station spacing;
Best placement acquisition module for the first time, be used for the peak that a described M-1 signal strength signal intensity is time strong as inferior good sync bit, be labeled as respectively Pos1, Pos2 ..., PosM-1.
18. the measurement mechanism of downlink channel condition information as claimed in claim 17, it is characterized in that, a described M-1 signal strength signal intensity time strong peak is in continuous repeatedly peak value joint-detection, and occurrence number surpasses M-1 the signal strength signal intensity time strong peak of default thresholding number of times.
19. the measurement mechanism of downlink channel condition information as claimed in claim 17, is characterized in that, described peak acquisition module is that the peak value of the default number in correlation that a described L sampled point is corresponding keeps, the secondary lobe zero setting on peak value side.
20. the measurement mechanism of downlink channel condition information as claimed in claim 11, is characterized in that, described sync bit acquiring unit also comprises:
The second optimal synchronisation position acquisition module, be used for obtaining the first sync bit Pos0 by the Cell searching algorithm;
The best placement acquisition module, be used for centered by described the first sync bit Pos0 for the second time, and front and back are the step-length Lx of mobile default number respectively, obtains other sync bit of default number, and wherein, the numerical value of step-length Lx is less than cyclic prefix CP length.
21. a subscriber equipment is characterized in that described subscriber equipment comprises the measurement mechanism as the described downlink channel condition information of claim 11 to 20 any one.
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