CN105099611A - Method of determining channel quality indicator in coordinative multiple point transmission, and base station - Google Patents

Abstract

The invention discloses a method of determining channel quality indicators (CQIs) in coordinative multiple point (COMP) transmission, and a base station. The method comprises: receiving a first CQI reported by user equipment (UE), wherein the first CQI is determined based on the downstream common reference signal (CRS) of a UE serving cell; obtaining the reference signal receive power (RSRP) corresponding to reference signals received by the UE; determining a compensation amount according to the RSRP, wherein the compensation amount is used for representing the difference between the quality of the channel transmitting the CRS, and the quality of a UE downstream data channel; and determining the second CQI of the UE downstream data channel according to the compensation amount and the first CQI. The method can compensate for the CQI reported by the UE, rapidly determine the CQI of the downstream data channel in COMP transmission, and thereby improve system performance.

Description

Method and the base station of CQI is determined in cooperative multipoint transmission

Technical field

The embodiment of the present invention relates to the communications field, more specifically, relates in cooperative multipoint transmission the method and base station of determining CQI.

Background technology

In LTE (LongTermEvolution, Long Term Evolution plan) system, in order to capacity, R11 supports coordinate multipoint (CoordinativeMultiplePoint, COMP) transmission.In cooperative multipoint transmission, the cooperative scheduling of multiple cell can improve community entirety and marginal user performance.Cooperative multipoint transmission can be divided into Combined Treatment (JointTransmission, JP), multiple cell Dynamic Selection sends (Dynamicpointselection, and cooperative scheduling/wave beam forming (CoordinatedSchedule/Beamforming, CS/CB) DPS).Compatible R10 and following terminal is needed in COMP.Relative to single cell transmission, after COMP is applied to the terminal of below R10, due to the terminal channel quality designator (ChannelQualityIndicator of below R10, CQI) down public guide frequency based on cell-level is measured, and data channel exists multi-cell cooperating, thus the mismatch of data channel and Common Pilot Channel is more serious.The mismatch of data channel and Common Pilot Channel can cause modulating during descending scheduling the selection with coding strategy (ModulationandCodingScheme, MCS), and then affects the performance of downlink transfer.

In order to make CQI and data channel quality match, can by the statistics adjustment CQI of Packet Error Ratio, when Packet Error Ratio is less than threshold value, the CQI that adding users equipment (UserEquipment, UE) reports, determines MCS according to the CQI after adjustment; When Packet Error Ratio is more than or equal to threshold value, reduce the CQI that UE reports, determine MCS according to the CQI after adjustment.When the CQI that UE reports and data channel quality differ greatly, this CQI Adjusted Option needs the long period to restrain.In CQI adjustment process, the difference of CQI and data channel quality can loss system performance.

Summary of the invention

Embodiments provide the method and base station of determining channel quality indicator CQI in a kind of cooperative multipoint transmission, the CQI of the downstream data channel in COMP can be determined quickly.

First aspect, provide a kind of method determining CQI in cooperative multipoint transmission COMP, the method comprises: the CQI receiving reported by user equipment UE, and a CQI is that UE determines according to the common pilot signal CRS of the Serving cell of UE; The Reference Signal Received Power RSRP that the reference signal that acquisition UE can receive is corresponding; According to RSRP, determine compensation rate, compensation rate is for representing the difference of the transmission quality of channel of CRS and the quality of the downstream data channel of UE; According to compensation rate and a CQI, determine the 2nd CQI of the downstream data channel of UE.

In conjunction with first aspect, in the implementation that the first is possible, compensation rate determines with the SINR of the channel of transmission CRS according to the Signal to Interference plus Noise Ratio SINR of the downstream data channel of UE.

In conjunction with the implementation that the first is possible, in the implementation that the second is possible, compensation rate is SINR compensation rate, according to compensation rate and a CQI, determine the 2nd CQI of the downstream data channel of UE, comprise: according to the mapping relations of CQI and SINR, determine the CQI compensation rate that SINR compensation rate is corresponding; According to a CQI and CQI compensation rate, determine the 2nd CQI.

In conjunction with the implementation that the second is possible, in the implementation that the third is possible, when COMP is single user joint transmission SU-JT, according to RSRP, determines compensation rate, comprising: determine SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{ServCell}}+{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*{\mathrm{RSRP}}_{\mathrm{ServCell}}}\right]$

Wherein, RSRP _allthe RSRP sum that all reference signals that can receive for UE are corresponding, RSRP _servCellfor UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for UE is to the RSRP of cooperation cell, SINR _{cQI-Compensate}unit be dB.

In conjunction with the implementation that the third is possible, in the 4th kind of possible implementation, when COMP is multi-user joint transmission MU-JT, according to RSRP, determines compensation rate, comprising: determine SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{ServCell}}+{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*{\mathrm{RSRP}}_{\mathrm{ServCell}}}\right]$

Wherein, RSRP _allthe RSRP sum that all reference signals that can receive for UE are corresponding, RSRP _servCellfor UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for UE is to the RSRP of cooperation cell, SINR _{cQI-Compensate}unit be dB; According to a CQI and CQI compensation rate, determine the 2nd CQI, comprising: according to the difference of CQI, CQI compensation rate and CQI, determine the 2nd CQI.

In conjunction with the implementation that the third is possible, in the 5th kind of possible implementation, when COMP is Dynamic Selection transmission DPS, and the public guide frequency of cooperation cell aligns in collaboration set, when the cooperation cell of UE does not send data-signal, according to RSRP, determine compensation rate, comprising: determine SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})}\right]$

Wherein, RSRP _allthe RSRP sum that all reference signals that can receive for UE are corresponding, RSRP _servCellfor UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for UE is to the RSRP of cooperation cell, SINR _{cQI-Compensate}unit be dB.

In conjunction with the implementation that the third is possible, in the 6th kind of possible implementation, when COMP is cooperative beam figuration CBF, according to RSRP, determines compensation rate, comprising: determine SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{{\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}}{{\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-(1-\mathrm{\α})*{\mathrm{RSRP}}_{\mathrm{InCoordinated}}}\right],$

Wherein, RSRP _allthe RSRP sum that all reference signals that can receive for UE are corresponding, RSRP _servCellfor UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for UE is to the RSRP of cooperation cell, SINR _{cQI-Compensate}the transmitting power of unit to be dB, α be cooperation cell the makes data flow dodged account for the ratio of total transmitting power of cooperation cell.

In conjunction with first aspect or the first is to any one the possible implementation in the 6th kind of possible implementation, in the 7th kind of possible implementation, the method also comprises: the Packet Error Ratio of statistics downstream data channel; When Packet Error Ratio is less than default threshold value, increase by the 2nd CQI; Or, when Packet Error Ratio is greater than default threshold value, reduce the 2nd CQI.

In conjunction with first aspect or the first is to any one the possible implementation in the 7th kind of possible implementation, in the 8th kind of possible implementation, the RSRP obtaining the UE reference signal that can receive corresponding comprises: receive the descending RSRP that UE that UE reports measures.

Second aspect, provides a kind of base station, and this base station comprises: receiver module, and for receiving a CQI of reported by user equipment UE, a CQI is that UE determines according to the common pilot signal CRS of the Serving cell of UE; Acquisition module, for obtaining Reference Signal Received Power RSRP corresponding to reference signal that UE can receive; Determination module, for the RSRP obtained according to acquisition module, determines compensation rate, and compensation rate is for representing the difference of the transmission quality of channel of CRS and the quality of the downstream data channel of UE; Determination module also for, according to compensation rate and a CQI, determine the 2nd CQI of the downstream data channel of UE.

In conjunction with second aspect, in the first possible implementation of second aspect, compensation rate determines with the SINR of the channel of transmission CRS according to the Signal to Interference plus Noise Ratio SINR of the downstream data channel of UE.

In conjunction with the first possible implementation of second aspect, in the implementation that the second of second aspect is possible, compensation rate is SINR compensation rate, determination module specifically for: according to the mapping relations of CQI and SINR, determine the CQI compensation rate that SINR compensation rate is corresponding; According to a CQI and CQI compensation rate, determine the 2nd CQI.

In conjunction with the implementation that the second of second aspect is possible, in the third possible implementation of second aspect, when COMP is single user joint transmission SU-JT, determination module specifically for, determine SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{ServCell}}+{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*{\mathrm{RSRP}}_{\mathrm{ServCell}}}\right]$

Wherein, RSRP _allthe RSRP sum that all reference signals that can receive for UE are corresponding, RSRP _servCellfor UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for UE is to the RSRP of cooperation cell, SINR _{cQI-Compensate}unit be dB.

In conjunction with the third possible implementation of second aspect, in the 4th kind of possible implementation of second aspect, when COMP is multi-user joint transmission MU-JT, determination module specifically for, determine SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{ServCell}}+{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*{\mathrm{RSRP}}_{\mathrm{ServCell}}}\right]$

Wherein, RSRP _allthe RSRP sum that all reference signals that can receive for UE are corresponding, RSRP _servCellfor UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for UE is to the RSRP of cooperation cell, SINR _{cQI-Compensate}unit be dB, determination module specifically for, according to the difference of CQI, CQI compensation rate and CQI corresponding to MU-JT and SU-JT, determine the 2nd CQI.

In conjunction with the third possible implementation of second aspect, in the 5th kind of possible implementation of second aspect, when COMP is Dynamic Selection transmission DPS, and the public guide frequency of cooperation cell aligns in collaboration set, when the cooperation cell of UE does not send data-signal, determination module specifically for, determine SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})}\right]$

Wherein, RSRP _allthe RSRP sum that all reference signals that can receive for UE are corresponding, RSRP _servCellfor UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for UE is to the RSRP of cooperation cell, SINR _{cQI-Compensate}unit be dB.

In conjunction with the third possible implementation of second aspect, in the 6th kind of possible implementation of second aspect, when COMP is cooperative beam figuration CBF, determination module specifically for, determine SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{{\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}}{{\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-(1-\mathrm{\α})*{\mathrm{RSRP}}_{\mathrm{InCoordinated}}}\right],$

Wherein, RSRP _allthe RSRP sum that all reference signals that can receive for UE are corresponding, RSRP _servCellfor UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for UE is to the RSRP of cooperation cell, SINR _{cQI-Compensate}the transmitting power of unit to be dB, α be cooperation cell the makes data flow dodged account for the ratio of total transmitting power of cooperation cell.

In conjunction with the first of second aspect or second aspect to any one the possible implementation in the 6th kind of possible implementation, in the 7th kind of possible implementation of second aspect, this base station also comprises: statistical module, for adding up the Packet Error Ratio of downstream data channel; Adjusting module, for when the Packet Error Ratio of statistical module counts is less than default threshold value, increases by the 2nd CQI; Or, when the Packet Error Ratio of statistical module counts is greater than default threshold value, reduce the 2nd CQI.

In conjunction with the first of second aspect or second aspect to any one the possible implementation in the 7th kind of possible implementation, in the 8th kind of possible implementation of second aspect, acquisition module specifically for, receive the descending RSRP that UE that UE reports measures.

Based on technique scheme, according to the RSRP that UE can receive, determine the compensation rate representing the quality of channel of transmission CRS signal and the difference of the quality of downstream data channel, the CQI that UE reports is compensated, the CQI of the downstream data channel in COMP can be determined quickly, and then can systematic function be improved.

Accompanying drawing explanation

In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, be briefly described to the accompanying drawing used required in the embodiment of the present invention below, apparently, accompanying drawing described is below only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is the indicative flowchart of the method determining CQI in the cooperative multipoint transmission according to the embodiment of the present invention.

Fig. 2 is the schematic block diagram of the application scenarios of the method determining CQI in the cooperative multipoint transmission according to the embodiment of the present invention.

Fig. 3 is the schematic block diagram determining the application scenarios of the method for CQI according to another embodiment of the present invention in cooperative multipoint transmission.

Fig. 4 is the schematic block diagram determining the application scenarios of the method for CQI according to another embodiment of the present invention in cooperative multipoint transmission.

Fig. 5 is the schematic block diagram determining the application scenarios of the method for CQI according to another embodiment of the present invention in cooperative multipoint transmission.

Fig. 6 is the schematic block diagram of the base station according to the embodiment of the present invention.

Fig. 7 is the schematic block diagram of base station according to another embodiment of the present invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiment.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all should belong to the scope of protection of the invention.

Fig. 1 shows the indicative flowchart according to the method 100 determining channel quality indicator CQI in embodiment of the present invention cooperative multipoint transmission COMP.Method 100 can be performed by the base station of the Serving cell of UE, and as shown in Figure 1, method 100 comprises following content.

110, receive a CQI of reported by user equipment UE, a CQI is that this UE determines according to the down public guide frequency signal (CommonReferenceSignal is called for short CRS) of the Serving cell of this UE.

120, the Reference Signal Received Power (ReferenceSignalReceivedPower is called for short RSRP) that reference signal that this UE can receive is corresponding is obtained.

Such as, base station can obtain Reference Signal Received Power corresponding to reference signal that this UE can receive on same running time-frequency resource.RSRP corresponding to the reference signal that UE can receive can comprise: UE to RSRP, UE of Serving cell is to RSRP and UE of cooperation cell to the RSRP of the neighbor cell outside collaboration set.

130, according to this RSRP, determine compensation rate, this compensation rate is for representing the difference of the transmission quality of channel of CRS and the quality of the downstream data channel of UE.

Such as, the channel transmitting CRS is Common Pilot Channel.

140, according to this compensation rate and a CQI, the 2nd CQI of the downstream data channel of UE is determined.

Therefore, according to the method determining CQI in the cooperative multipoint transmission of the embodiment of the present invention, according to the RSRP that UE can receive, determine the compensation rate representing the quality of channel of transmission CRS signal and the difference of the quality of downstream data channel, to compensating of the CQI that UE reports, the CQI of downstream data channel can be determined quickly, and then can systematic function be improved.

Particularly, in 120, the RSRP that the reference signal that acquisition UE can receive is corresponding, can comprise the descending RSRP receiving the UE measurement that UE reports.

That is, the RSRP that the UE reference signal that can receive is corresponding can be measured by UE and report.After the power of the downlink reference signal from Serving cell and neighbor cell that UE measurement receives, can be triggered by A3 event and report base station by UE.The descending RSRP that this UE measures comprises: the descending RSRP of the cooperation cell in the collaboration set of descending RSRP, UE measurement of the Serving cell that the summation of the descending RSRP that UE measures, UE measure.

Alternately, in 120, the RSRP that the reference signal that acquisition UE can receive is corresponding, can also comprise by the up RSRP of base station measurement.Specifically comprise, the up RSRP of the UE of the base station measurement of the Serving cell of UE, and the up RSRP of UE that the neighbor cell base station that the base station of reception of neighboring cell sends measures separately.

Particularly, compensation rate can be that the Signal to Interference plus Noise Ratio (SignaltoInterferenceplusNoiseRatio is called for short SINR) of downstream data channel according to this UE is determined with the SINR of the channel of transmission CRS.

This compensation rate can be SINR compensation rate.Correspondingly, in 140, according to the mapping relations of CQI and SINR, the CQI compensation rate that this SINR compensation rate is corresponding can be determined; According to a CQI and CQI compensation rate, determine the 2nd CQI.

Alternately, in embodiments of the present invention, can also according to the mapping relations of CQI and SINR, determine the SINR of the Common Pilot Channel that a CQI that UE reports is corresponding; Again according to SINR and this SINR compensation rate of this Common Pilot Channel, determine the SINR of downstream data channel; Then according to the mapping relations of CQI and SINR, the 2nd CQI that the SINR of this downstream data channel is corresponding is determined.

In other words, can obtain the 2nd CQI by two kinds of methods: be corresponding CQI compensation rate by the conversion of SINR compensation rate, the CQI then reported according to UE and this CQI compensation rate, determine the 2nd CQI; Or, the CQI conversion reported by UE is the SINR of corresponding Common Pilot Channel, obtain the SINR of downstream data channel again according to SINR and the SINR compensation rate of this Common Pilot Channel, and then the SINR of downstream data channel is converted as the 2nd corresponding CQI.

When described COMP is single user joint transmission (SingleUserJointTransmission is called for short SU-JT), according to RSRP, determines compensation rate, comprising: determine SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{ServCell}}+{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*{\mathrm{RSRP}}_{\mathrm{ServCell}}}\right]---\left(1\right)$

Wherein, RSRP _allthe RSRP sum that all reference signals that can receive for UE are corresponding, RSRP _servCellfor UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for UE is to the RSRP of cooperation cell, SINR _{cQI-Compensate}unit be dB.

When COMP is multi-user joint transmission (Multi-UserJointTransmission is called for short MU-JT), according to RSRP, determines compensation rate, comprising: determine SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{ServCell}}+{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*{\mathrm{RSRP}}_{\mathrm{ServCell}}}\right]---\left(2\right)$

Wherein, RSRP _allthe RSRP sum that all reference signals that can receive for UE are corresponding, RSRP _servCellfor UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for UE is to the RSRP of cooperation cell, SINR _{cQI-Compensate}unit be dB.In 140, according to the difference of CQI, CQI compensation rate and CQI corresponding to MU-JT and SU-JT, the 2nd CQI can be determined.

Should understand, in 140, according to the difference of SINR corresponding to the SINR of SINR compensation rate, Common Pilot Channel and MU-JT and SU-JT, the SINR of this downstream data channel can also be determined, then according to the mapping relations of CQI and SINR, the 2nd CQI that the SINR of this downstream data channel is corresponding is obtained.

Can find out, the SINR compensation rate formula (1) corresponding respectively when COMP is SU-JT and MU-JT and (2) are identical.Should be understood that MU-JT is on the basis of SU-JT, same running time-frequency resource sends data to the UE of more than 2 or 2.In MU-JT, the interference that the downlink data signal of UE is subject to comprises: the interference of the interference outside collaboration set and collaboration set interior pairing UE.And in SU-JT, the interference that the downlink data signal of UE is subject to comprises the interference outside collaboration set.When determining SINR compensation rate in 130, do not consider that the pairing UE in collaboration set, same running time-frequency resource receiving data is to the interference of the downlink data signal of this UE.That is, when COMP is MU-JT, the SINR compensation rate determined in 130 is SINR compensation rate corresponding to SU-JT.Then, the optimum configurations that can generate producer according to communication equipment determines the difference that MU-JT and SU-JT is corresponding, the difference of this difference can be the difference of CQI also can be SINR, this difference determines by disturbing between the ratio of the data flow power of MU-JT and the data flow power of SU-JT and MU-JT data flow.The concrete grammar that different communication device fabrication producer calculates the difference of SINR corresponding to MU-JT and SU-JT or the difference of CQI is different.

Particularly, when COMP is that Dynamic Selection sends (Dynamicpointselection, be called for short DPS) time, and the public guide frequency of cooperation cell aligns in collaboration set, when the cooperation cell of this UE does not send data-signal, according to RSRP, determine compensation rate, comprise: determine SINR compensation rate according to following formula

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})}\right]---\left(3\right)$

Wherein, RSRP _allthe RSRP sum that all reference signals that can receive for this UE are corresponding, RSRP _servCellfor UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for UE is to the RSRP of cooperation cell, SINR _{cQI-Compensate}unit be dB.

Particularly, when this COMP is cooperative beam figuration (CoordinationBeamForming is called for short CBF), according to RSRP, determines compensation rate, comprising: determine SINR compensation rate according to following formula,

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{{\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}}{{\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-(1-\mathrm{\α})*{\mathrm{RSRP}}_{\mathrm{InCoordinated}}}\right]---\left(4\right)$

Wherein, RSRP _allthe RSRP sum that all reference signals that can receive for UE are corresponding, RSRP _servCellfor UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for UE is to the RSRP of cooperation cell, SINR _{cQI-Compensate}unit be dB, this α is the ratio that transmitting power that the data flow dodged is made in cooperation cell accounts for total transmitting power of this cooperation cell.

Alternatively, as another embodiment, method 100 also comprises: the Packet Error Ratio adding up this downstream data channel; When this Packet Error Ratio is less than default threshold value, increase by the 2nd CQI; When this Packet Error Ratio is greater than this default threshold value, reduce the 2nd CQI.

On the basis of the CQI of the downstream data channel determined according to method 100, the Packet Error Ratio of statistics downstream data channel, and further CQI is adjusted according to this Packet Error Ratio, the CQI after adjustment can reflect the quality of the downstream data channel of many cooperation cell in COMP more exactly.The embodiment of the present invention compares the direct CQI reported according to Packet Error Ratio adjustment UE in existing scheme, can accelerate the convergence rate of CQI adjustment in COMP, and then improve systematic function.

Therefore, according to the method determining CQI in the cooperative multipoint transmission of the embodiment of the present invention, according to the RSRP that UE can receive, determine the compensation rate representing the quality of channel of transmission CRS signal and the difference of the quality of downstream data channel, to compensating of the CQI that UE reports, the CQI of downstream data channel can be determined quickly, and then can systematic function be improved.

Below in conjunction with Fig. 2 to Fig. 5, describe the method 100 determining CQI in the COMP according to the embodiment of the present invention in detail.Should understand, for ease of describing, in Fig. 2 to Fig. 5, Jun Yiliangge community is that example is described, and one of them be the Serving cell of UE is the cooperation cell of UE with another, but the embodiment of the present invention is not limited to this, the community in the collaboration set of COMP can also be any number of.

Fig. 2 is the schematic block diagram determining the application scenarios 200 of the method for CQI according to another embodiment of the present invention in cooperative multipoint transmission.Application scenarios 200 is single user joint transmission (SU-JT), and Serving cell and cooperation cell send data to UE0 simultaneously, and the CRS that UE0 issues based on Serving cell measures CQI, and reports the base station of Serving cell.The CQI that this base station reception UE0 reports is for descending scheduling.

210, the CQI that reports of base station receives user equipment UE.

220, base station receives the descending RSRP of the UE measurement that UE reports.

230, RSRP is substituted into formula (1), determine SINR compensation rate, this SINR compensation rate is for representing the difference of the transmission quality of channel of CRS and the quality of the downstream data channel of UE.

The derivation of formula (1) is described in detail below in conjunction with step 231 ~ 233.

231, the Signal to Interference plus Noise Ratio SINR of the Common Pilot Channel of UE0 is determined _cRSwith the Signal to Interference plus Noise Ratio SINR of downstream data channel _pDSCHcomputing formula.

The common pilot signal power that UE0 receives is the interference that the public guide frequency of UE0 is subject to is the interference of comparing cooperation cell is made an uproar when can ignore in the end that UE0 is subject to, then the Signal to Interference plus Noise Ratio SINR of Common Pilot Channel _cRSfor:

${\mathrm{SINR}}_{\mathrm{CRS}}=\frac{S_{\mathrm{Total}}^{\mathrm{CRS}}}{I_{\mathrm{Total}}^{\mathrm{CRS}}}=\frac{S_{\mathrm{SrevCell}}^{\mathrm{CRS}}}{I_{\mathrm{InCoordinated}}^{\mathrm{CRS}}+I_{\mathrm{OutCoordinated}}^{\mathrm{CRS}}}$

Wherein, the power of the common pilot signal of the Serving cell received for UE0, for the power of the interference signal of the cooperation cell in the collaboration set that UE0 receives, for the power of the interference signal outside the collaboration set that UE0 receives.

Serving cell and cooperation cell send data for UE0 simultaneously, and the data-signal that UE0 receives is the power of the interference signal that the downstream data channel of UE0 is subject to is the interference of comparing cooperation cell is made an uproar when can ignore in the end, then the Signal to Interference plus Noise Ratio SINR of downstream data channel _pDSCHfor:

${\mathrm{SINR}}_{\mathrm{PDSCH}}=\frac{S_{\mathrm{Total}}^{\mathrm{PDSCH}}}{I_{\mathrm{Total}}^{\mathrm{PDSCH}}}=\frac{S_{\mathrm{SrevCell}}^{\mathrm{PDSCH}}+S_{\mathrm{InCoordinated}}^{\mathrm{PDSCH}}}{I_{\mathrm{InCoordinated}}^{\mathrm{PDSCH}}}$

Wherein, the power of the downlink data signal of the Serving cell received for UE0, for the power of the downlink data signal of the cooperation cell in the collaboration set that UE0 receives, for the power of the interference signal outside the collaboration set that UE0 receives.

232, with the received power RSRP equivalent substitution useful signal S and interference signal I of signal, then:

${\mathrm{SINR}}_{\mathrm{CRS}}=\frac{{\mathrm{RSRP}}_{\mathrm{ServCell}}}{{\mathrm{RSRP}}_{\mathrm{InCoordinated}}+{\mathrm{RSRP}}_{\mathrm{OutCoordinated}}},{\mathrm{SINR}}_{\mathrm{PDSCH}}=\frac{{\mathrm{RSRP}}_{\mathrm{ServCell}}+{\mathrm{RSRP}}_{\mathrm{InCoordinated}}}{{\mathrm{RSRP}}_{\mathrm{OutCoordinated}}}$

Wherein: RSRP _{outCoordinated}=RSRP _all-RSRP _servCell-RSRP _{inCoordinated}

RSRP _{outCoordinated}for UE0 is to the RSRP outside cooperation cell, RSRP _allthe UE0 reported for UE0 to all adjacent areas RSRP sum, RSRP _servCellfor UE0 is to the RSRP of Serving cell, RSRP _{inCoordinated}for UE0 is to the RSRP of cooperation cell.

$\frac{{\mathrm{SINR}}_{\mathrm{PDSCH}}}{{\mathrm{SINR}}_{\mathrm{CRS}}}=\frac{({\mathrm{RSRP}}_{\mathrm{ServCell}}+{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*({\mathrm{RSRP}}_{\mathrm{InCloordinated}}+{\mathrm{RSRP}}_{\mathrm{PuoCoorDinated}})}{{\mathrm{RSRP}}_{\mathrm{OutCoordinated}}*{\mathrm{RSRP}}_{\mathrm{ServCell}}}$

${\mathrm{SINR}}_{\mathrm{PDSCH}}={\mathrm{SINR}}_{\mathrm{CRS}}*\left[\frac{({\mathrm{RSRP}}_{\mathrm{ServCell}}+{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*{\mathrm{RSRP}}_{\mathrm{ServCell}}}\right]$

233,10 times of denary logarithms are got at above formula two ends, namely SINR gets decibel dB is unit, obtains:

${\mathrm{SINR}}_{\mathrm{PDSCH}}={\mathrm{SINR}}_{\mathrm{CRS}}+10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{ServCell}}+{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*{\mathrm{RSRP}}_{\mathrm{ServCell}}}\right]$

Then obtain SINR compensation rate:

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{ServCell}}+{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*{\mathrm{RSRP}}_{\mathrm{ServCell}}}\right]---\left(1\right)$

Then the RSRP received by the UE0 that UE0 reports substitutes into above formula (1), just can obtain the Signal to Interference plus Noise Ratio SINR of the Common Pilot Channel of UE _cRSrelative to the Signal to Interference plus Noise Ratio SINR of the downstream data channel of UE _pDSCHsINR compensation rate.

240, base station is according to the mapping relations of SINR and CQI, determines the SINR that CQI that UE0 reports is corresponding _cRS(dB), compensation rate SINR is added _{cQI-Compensate}(dB) the SINR value SINR on SU-JT data channel can, just be obtained _pDSCH(dB), then according to the mapping relations of SINR and CQI, the CQI of downstream data channel is obtained _pDSCH.

Or, can CQI be obtained by the mapping relations of SINR and CQI _pDSCH=CQI _cRS+ CQI _compensate, determine SINR according to the RSRP that UE reports _{cQI-Compensate}, the mapping relations according to SINR and CQI obtain SINR _{cQI-Compensate}the compensation rate CQI of corresponding CQI _compensate, then by the CQI of reporting of user _cRSadd CQI _compensatethe CQI of downstream data channel can be obtained _pDSCH.

Therefore, according to the method determining CQI in the cooperative multipoint transmission of the embodiment of the present invention, according to the RSRP that UE can receive, determine the compensation rate representing the quality of channel of transmission CRS signal and the difference of the quality of downstream data channel, to compensating of the CQI that UE reports, the CQI of downstream data channel can be determined quickly, and then can systematic function be improved.

Fig. 3 is the schematic block diagram of the application scenarios 300 of the method 300 of the downstream data channel CQI determining COMP according to another embodiment of the present invention.

Application scenarios 300 is multi-user joint transmission (MU-JT) as shown in Figure 3, in MU-JT, UE0 and UE1 takies identical running time-frequency resource, and namely Serving cell and cooperation cell are that UE0 and cooperation cell send data simultaneously, and the public guide frequency that CQI issues based on Serving cell is measured.The method determining the downstream data channel of UE0 is described below in detail for UE0.

310, the CQI that reports of base station receives user equipment UE.

320, base station receives the descending RSRP of the UE measurement that UE reports.

330, RSRP is substituted into formula (2), determine SINR compensation rate, this SINR compensation rate is for representing the difference of the transmission quality of channel of CRS and the quality of the downstream data channel of UE.

The detailed derivation of formula (2) can associated description in reference method 200, does not repeat them here.The interference signal of the UE1 that UE0 receives is put aside when should be understood that derivation formula (2).

340, according to the conversion relation of MU-JT and SU-JT, the Signal to Interference plus Noise Ratio SINR of the data channel of MU-JT can be obtained _pDSCHcomputing formula:

SINR _PDSCH＝SINR _CRS+SINR _{CQI-Compensate}+SINR _{CQI-Compensate2}，

Wherein, SINR _{cQI-Compensate2}the difference of SINR corresponding to the CQI of SU-JT and MU-JT, this difference is by MU-JT data flow power P _mu-jtwith SU-JT data flow power P _su-jtratio and MU-JT data flow between disturb I _mu-jtdetermine, SINR _{cQI-Compensate2}=f (P _mu-jt/ P _su-jt, I _mu-jt).Corresponding to the CQI that different communication equipment manufacturer calculates SU-JT and MU-JT, the method for the difference of SINR is different.

350, the SINR that the CQI that reported by UE0 of base station is corresponding _cQI-Report(dB) compensation rate SINR is added _{cQI-Compensate}and SINR (dB) _{cQI-Compensate2}(dB) the SINR value SINR on MU-JT data channel can, just be obtained _pDSCH(dB), then according to the mapping relations of SINR and CQI, the SINR of downstream data channel is obtained _pDSCHcorresponding CQI _pDSCH.

Or, according to the mapping relations of SINR and CQI, obtain the channel quality indicator CQI of the data channel of MU-JT _pDSCHcomputing formula: CQI _pDSCH=CQI _report+ CQI _compensate+ CQI _compensate2, determine according to the RSRP that UE reports, the mapping relations according to SINR and CQI obtain SINR _{cQI-Compensate}and SINR _{cQI-Compensate2}corresponding CQI _compensateand CQI _compensate2, then by CQI _compensate, CQI _compensate2with the CQI of reporting of user _reportbe added, the CQI of downstream data channel can be obtained _pDSCH.

Therefore, according to the method determining CQI in the cooperative multipoint transmission of the embodiment of the present invention, according to the RSRP that UE can receive, determine the compensation rate representing the quality of channel of transmission CRS signal and the difference of the quality of downstream data channel, to compensating of the CQI that UE reports, the CQI of downstream data channel can be determined quickly, and then can systematic function be improved.

Fig. 4 is the schematic block diagram of the application scenarios 400 of the method 400 of the downstream data channel CQI determining COMP according to another embodiment of the present invention.

Application scenarios 400 is in Dynamic Selection transmission (Dynamicpointselection, DPS) as shown in Figure 4, and cooperation cell, in order to avoid the interference to adjacent area terminal, does not send data.The CRS that UE0 issues based on Serving cell measures CQI, and reports the base station of Serving cell.The CQI that this base station reception UE0 reports is for descending scheduling.

410, the CQI that reports of base station receives user equipment UE.

420, base station receives the descending RSRP of the UE measurement that UE reports.

430, RSRP is substituted into formula (3), determine SINR compensation rate, described SINR compensation rate is for representing the difference of the transmission quality of channel of CRS and the quality of the downstream data channel of UE.

The derivation of formula (3) is described in detail below in conjunction with step 431 ~ 433.

431, the Signal to Interference plus Noise Ratio SINR of the Common Pilot Channel of UE0 is determined _cRSwith the Signal to Interference plus Noise Ratio SINR of downstream data channel _pDSCHcomputing formula.

When in collaboration set, the public guide frequency of community aligns, the common pilot signal power that UE0 receives is $S_{\mathrm{Total}}^{\mathrm{CRS}}=S_{\mathrm{ServCell}}^{\mathrm{CRS}},$ The interference that UE0 public guide frequency is subject to is $I_{\mathrm{Total}}^{\mathrm{CRS}}=I_{\mathrm{InCoordinated}}^{\mathrm{CRS}}+I_{\mathrm{OutCoordinated}}^{\mathrm{CRS}},$ The interference of comparing cooperation cell is made an uproar when can ignore in the end that UE0 is subject to, then the Signal to Interference plus Noise Ratio SINR of Common Pilot Channel _cRSfor:

${\mathrm{SINR}}_{\mathrm{CRS}}=\frac{S_{\mathrm{Total}}^{\mathrm{CRS}}}{I_{\mathrm{Total}}^{\mathrm{CRS}}}=\frac{S_{\mathrm{SrevCell}}^{\mathrm{CRS}}}{I_{\mathrm{InCoordinated}}^{\mathrm{CRS}}+I_{\mathrm{OutCoordinated}}^{\mathrm{CRS}}}$

Wherein, the power of the common pilot signal of the Serving cell received for UE0, for the power of the interference signal of the cooperation cell in the collaboration set that UE0 receives, for the power of the interference signal outside the collaboration set that UE0 receives.

When Serving cell is UE0 transmission data, cooperation cell does not send data, and the data-signal that UE0 receives is the power of the interference signal that the downstream data channel of UE0 is subject to is the interference of comparing cooperation cell is made an uproar when can ignore in the end, then the Signal to Interference plus Noise Ratio SINR of downstream data channel _pDSCHfor:

${\mathrm{SINR}}_{\mathrm{PDSCH}}=\frac{S_{\mathrm{Total}}^{\mathrm{PDSCH}}}{I_{\mathrm{Total}}^{\mathrm{PDSCH}}}=\frac{S_{\mathrm{SrevCell}}^{\mathrm{PDSCH}}+S_{\mathrm{InCoordinated}}^{\mathrm{PDSCH}}}{I_{\mathrm{InCoordinated}}^{\mathrm{PDSCH}}}$

Wherein, the power of the downlink data signal of the Serving cell received for UE0, for the power of the interference signal outside the collaboration set that UE0 receives.

432, with the received power RSRP equivalent substitution useful signal S and interference signal I of signal, then:

${\mathrm{SINR}}_{\mathrm{CRS}}=\frac{{\mathrm{RSRP}}_{\mathrm{ServCell}}}{{\mathrm{RSRP}}_{\mathrm{InCoordinated}}+{\mathrm{RSRP}}_{\mathrm{OutCoordinated}}}$

${\mathrm{SINR}}_{\mathrm{PDSCH}}=\frac{{\mathrm{RSRP}}_{\mathrm{ServCell}}}{{\mathrm{RSRP}}_{\mathrm{OutCoordinated}}}$

Wherein: RSRP _{outCoordinated}=RSRP _all-RSRP _servCell-RSRP _{inCoordinated}

RSRP _{outCoordinated}for UE0 is to the RSRP outside cooperation cell, RSRP _allthe UE0 reported for UE0 to all adjacent areas RSRP sum, RSRP _servCellfor UE0 is to the RSRP of Serving cell, RSRP _{inCoordinated}for UE0 is to the RSRP of cooperation cell.

$\frac{{\mathrm{SINR}}_{\mathrm{PDSCH}}}{{\mathrm{SINR}}_{\mathrm{CRS}}}=\frac{({\mathrm{RSRP}}_{\mathrm{InCoordinated}}+{\mathrm{RSRP}}_{\mathrm{OutCoordinated}})}{{\mathrm{RSRP}}_{\mathrm{OutCoordinated}}}$

${\mathrm{SINR}}_{\mathrm{PDSCH}}={\mathrm{SINR}}_{\mathrm{CRS}}*\frac{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{{(\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})}$

433,10 times of denary logarithms are got at above formula two ends, namely SINR gets decibel dB is unit, obtains:

${\mathrm{SINR}}_{\mathrm{PDSCH}}={\mathrm{SINR}}_{\mathrm{CRS}}+10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{{(\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})}\right]$

Then obtain SINR compensation rate:

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{{(\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})}\right]---\left(3\right)$

Then the RSRP received by the UE0 that UE0 reports substitutes into formula (3), just can obtain the Signal to Interference plus Noise Ratio SINR of the Common Pilot Channel of UE _cRSrelative to the Signal to Interference plus Noise Ratio SINR of the downstream data channel of UE _pDSCHsINR compensation rate.

440, base station is according to SINR compensation rate SINR _{cQI-Compensate}with the CQI that UE0 reports, determine the CQI of the downstream data channel of UE0.Detailed step can step 240 in reference method 200, does not repeat them here.

Therefore, according to the method determining CQI in the cooperative multipoint transmission of the embodiment of the present invention, according to the RSRP that UE can receive, determine the compensation rate representing the quality of channel of transmission CRS signal and the difference of the quality of downstream data channel, to compensating of the CQI that UE reports, the CQI of downstream data channel can be determined quickly, and then can systematic function be improved.

Fig. 5 is the schematic block diagram of the application scenarios 500 of the method 500 of the downstream data channel CQI determining COMP according to another embodiment of the present invention.

Application scenarios 500 is cooperative beam figuration (CoordinationBeamForming as shown in Figure 5, CBF) system, by adjusting user's weights of neighbor cell on same running time-frequency resource in collaboration set, and then presence of intercell interference can be reduced.The CRS that UE0 issues based on Serving cell measures CQI, and reports the base station of Serving cell.The CQI that this base station reception UE0 reports is for descending scheduling.

510, the CQI that reports of base station receives user equipment UE.

520, base station receives the descending RSRP of the UE measurement that UE reports.

530, by RSRP, substitute into formula (4), determine SINR compensation rate, described SINR compensation rate is for representing the difference of the transmission quality of channel of CRS and the quality of the downstream data channel of UE.

The derivation of formula (4) is described in detail below in conjunction with step 531 ~ 533.

531, the Signal to Interference plus Noise Ratio SINR of the Common Pilot Channel of UE0 is determined _cRSwith the Signal to Interference plus Noise Ratio SINR of downstream data channel _pDSCHcomputing formula.

The common pilot signal power that UE0 receives is the interference that UE0 public guide frequency is subject to is the interference of comparing cooperation cell is made an uproar when can ignore in the end that UE0 is subject to, then the Signal to Interference plus Noise Ratio SINR of Common Pilot Channel _cRSfor:

${\mathrm{SINR}}_{\mathrm{CRS}}=\frac{S_{\mathrm{Total}}^{\mathrm{CRS}}}{I_{\mathrm{Total}}^{\mathrm{CRS}}}=\frac{S_{\mathrm{SrevCell}}^{\mathrm{CRS}}}{I_{\mathrm{InCoordinated}}^{\mathrm{CRS}}+I_{\mathrm{OutCoordinated}}^{\mathrm{CRS}}}$

Wherein, the power of the common pilot signal of the Serving cell received for UE0, for the power of the interference signal of the cooperation cell in the collaboration set that UE0 receives, for the power of the interference signal outside the collaboration set that UE0 receives.

When Serving cell is UE0 transmission data, cooperation cell does not send data, and the data-signal that UE0 receives is

In order to reduce the interference to UE0, the wave beam forming done when cooperation cell is UE1 transmission data is dodged UE0.If α _powerfor making the transmitting power P of the data flow dodged _coordinateaccount for the total transmitting power P in cooperation cell _totalratio, the interference of dodging the cooperation cell that rear UE0 is subject to is original α _powerdoubly (0≤α _power<1), when cooperation cell all data streams has all done interference avoidance to UE0, α _power=0, wherein,

${\mathrm{\&alpha;}}_{\mathrm{Power}}=\frac{P_{\mathrm{Coordinate}}}{P_{\mathrm{Total}}}$

The power of interference signal that then UE0 receives is the end is when making an uproar and can ignore compared with the interference be subject to, then the Signal to Interference plus Noise Ratio SINR of downstream data channel _pDSCHfor:

${\mathrm{SINR}}_{\mathrm{PDSCH}}=\frac{S_{\mathrm{Total}}^{\mathrm{PDSCH}}}{I_{\mathrm{Total}}^{\mathrm{PDSCH}}}=\frac{S_{\mathrm{SrevCell}}^{\mathrm{PDSCH}}}{{{\mathrm{\&alpha;}}_{\mathrm{Power}}*I}_{\mathrm{InCoordinated}}^{\mathrm{PDSCH}}+I_{\mathrm{OutCoordinated}}^{\mathrm{PDSCH}}}$

532, with the received power RSRP equivalent substitution useful signal S and interference signal I of signal, then:

${\mathrm{SINR}}_{\mathrm{CRS}}=\frac{{\mathrm{RSRP}}_{\mathrm{ServCell}}}{{\mathrm{RSRP}}_{\mathrm{InCoordinated}}+{\mathrm{RSRP}}_{\mathrm{OutCoordinated}}}$

${\mathrm{SINR}}_{\mathrm{PDSCH}}=\frac{{\mathrm{RSRP}}_{\mathrm{ServCell}}}{{\mathrm{RSRP}}_{\mathrm{OutCoordinated}}+\mathrm{\&alpha;}*{\mathrm{RSRP}}_{\mathrm{InCoordinated}}}$

Wherein, RSRP _{outCoordinated}=RSRP _all-RSRP _servCell-RSRP _{inCoordinated}

RSRP _{outCoordinated}for UE0 is to the RSRP outside cooperation cell, RSRP _allthe UE0 reported for UE0 to all adjacent areas RSRP sum, RSRP _servCellfor UE0 is to the RSRP of Serving cell, RSRP _{inCoordinated}for UE0 is to the RSRP of cooperation cell.

$\frac{{\mathrm{SINR}}_{\mathrm{PDSCH}}}{{\mathrm{SINR}}_{\mathrm{CRS}}}=\frac{{\mathrm{RSRP}}_{\mathrm{InCoordinated}}+{\mathrm{RSRP}}_{\mathrm{OutCoordinated}}}{{\mathrm{RSRP}}_{\mathrm{OutCoordinated}}+\mathrm{\&alpha;}*{\mathrm{RSRP}}_{\mathrm{InCoordinated}}}$

${\mathrm{SINR}}_{\mathrm{PDSCH}}={\mathrm{SINR}}_{\mathrm{CRS}}*\frac{{\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}}{[{\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-(1-\mathrm{\&alpha;})*{\mathrm{RSRP}}_{\mathrm{InCoordinated}}]}$

533,10 times of denary logarithms are got at above formula two ends, namely SINR gets decibel dB is unit, obtains:

${\mathrm{SINR}}_{\mathrm{PDSCH}}={\mathrm{SINR}}_{\mathrm{CRS}}+10\log \left[\frac{{\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}}{{\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-(1-\mathrm{\&alpha;})*{\mathrm{RSRP}}_{\mathrm{InCoordinated}}}\right]$

Then obtain SINR compensation rate:

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{{\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}}{{\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-(1-\mathrm{\&alpha;})*{\mathrm{RSRP}}_{\mathrm{InCoordinated}}}\right]---\left(4\right)$

Then the RSRP received by the UE0 that UE0 reports substitutes into formula (4), just can obtain the Signal to Interference plus Noise Ratio SINR of the Common Pilot Channel of UE _cRSrelative to the Signal to Interference plus Noise Ratio SINR of the downstream data channel of UE _pDSCHsINR compensation rate.

540, base station is according to SINR compensation rate SINR _{cQI-Compensate}with the CQI that UE0 reports, determine the CQI of the downstream data channel of UE0.Detailed step can step 240 in reference method 200, does not repeat them here.

Therefore, according to the method determining CQI in the cooperative multipoint transmission of the embodiment of the present invention, according to the RSRP that UE can receive, determine the compensation rate representing the quality of channel of transmission CRS signal and the difference of the quality of downstream data channel, to compensating of the CQI that UE reports, the CQI of downstream data channel can be determined quickly, and then can systematic function be improved.

It should be noted that the example of Fig. 2 to Fig. 5 is to help those skilled in the art to understand the embodiment of the present invention better, and the scope of the embodiment of the present invention have to be limited.Those skilled in the art, according to the example of given Fig. 2 to Fig. 5, obviously can carry out amendment or the change of various equivalence, and such amendment or change also fall in the scope of the embodiment of the present invention.

Should be understood that the size of the sequence number of above-mentioned each process and do not mean that the priority of execution sequence, the execution sequence of each process should be determined with its function and internal logic, and should not form any restriction to the implementation process of the embodiment of the present invention.

Above composition graphs 1 to Fig. 5, describes the method determining CQI in the cooperative multipoint transmission according to the embodiment of the present invention in detail, below in conjunction with Fig. 6 and Fig. 7, describes the base station according to the embodiment of the present invention.

Fig. 6 shows the schematic block diagram of the base station 600 according to the embodiment of the present invention.As shown in Figure 6, base station 600 comprises: receiver module 610, acquisition module 620 and determination module 630.

Receiver module 610, for receiving a CQI of reported by user equipment UE, a CQI is that this UE determines according to the common pilot signal CRS of the Serving cell of this UE.

Acquisition module 620, for obtaining Reference Signal Received Power RSRP corresponding to reference signal that this UE can receive.

Determination module 630, for this RSRP obtained according to acquisition module, determines compensation rate, and this compensation rate is for representing the difference of the transmission quality of channel of this CRS and the quality of the downstream data channel of this UE.

Determination module 630 also for, according to this compensation rate and a CQI, determine the 2nd CQI of the downstream data channel of this UE.

Therefore, the base station of the embodiment of the present invention, by the RSRP that can receive according to UE, determine the compensation rate transmitting the quality of channel of CRS signal and the difference of the quality of downstream data channel, to compensating of the CQI that UE reports, the CQI of downstream data channel can be determined quickly, and then can systematic function be improved.

Particularly, the descending RSRP that this UE that acquisition module 620 can report specifically for receiving UE measures.

Particularly, this compensation rate can be determine with the SINR of the channel of this CRS of transmission according to the Signal to Interference plus Noise Ratio SINR of the downstream data channel of this UE.

Particularly, this compensation rate can be SINR compensation rate.Correspondingly, determination module 630 specifically for: according to the mapping relations of CQI and SINR, determine the CQI compensation rate that this SINR compensation rate is corresponding; According to a CQI and this CQI compensation rate, determine the 2nd CQI.

Particularly, when this COMP is single user joint transmission SU-JT, determination module 630 specifically for, determine this SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{ServCell}}+{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*{\mathrm{RSRP}}_{\mathrm{ServCell}}}\right]$

Wherein, RSRP _allthe RSRP sum that all reference signals that can receive for UE are corresponding, RSRP _servCellfor UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for UE is to the RSRP of cooperation cell, SINR _{cQI-Compensate}unit be dB.

When this COMP is multi-user joint transmission MU-JT, determine cover half block 630 specifically for, determine this SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{ServCell}}+{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*{\mathrm{RSRP}}_{\mathrm{ServCell}}}\right]$

Wherein, RSRP _allthe RSRP sum that all reference signals that can receive for this UE are corresponding, RSRP _servCellfor UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for UE is to the RSRP of cooperation cell, SINR _{cQI-Compensate}unit be dB.Determination module 630 specifically for, according to the difference of CQI, CQI compensation rate and CQI corresponding to MU-JT and SU-JT, determine the 2nd CQI.

When this COMP is Dynamic Selection transmission DPS, and in collaboration set, the public guide frequency of cooperation cell aligns, and when the cooperation cell of this UE does not send data-signal, described determination module is specifically for determining described SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})}\right]$

Wherein, RSRP _allthe RSRP sum that all reference signals that can receive for UE are corresponding, RSRP _servCellfor UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for UE is to the RSRP of cooperation cell, SINR _{cQI-Compensate}unit be dB.

When this COMP is cooperative beam figuration CBF, described determination module is specifically for determining described SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{{\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}}{{\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-(1-\mathrm{\&alpha;})*{\mathrm{RSRP}}_{\mathrm{InCoordinated}}}\right],$

Wherein, RSRP _allthe RSRP sum that all reference signals that can receive for UE are corresponding, RSRP _servCellfor UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for UE is to the RSRP of cooperation cell, SINR _{cQI-Compensate}unit be dB, this α is the ratio that transmitting power that the data flow dodged is made in cooperation cell accounts for total transmitting power of this cooperation cell.

Alternatively, as another embodiment, base station 600 also comprises: statistical module 640 and adjusting module 650.

Statistical module 640 is for adding up the Packet Error Ratio of downstream data channel, and adjusting module 650, for when this Packet Error Ratio of this statistical module counts is less than default threshold value, increases by the 2nd CQI; When this Packet Error Ratio of this statistical module counts is greater than this default threshold value, reduce the 2nd CQI.

Should understand, base station 600 according to the embodiment of the present invention may correspond to the base station determined in the COMP of the embodiment of the present invention in the method 100 of CQI, and above-mentioned and other operation of the modules in base station 600 and/or function are respectively in order to realize the corresponding flow process of each method 100 in Fig. 1, for simplicity, do not repeat them here.

Therefore, the base station of the embodiment of the present invention, by the RSRP that can receive according to UE, determine the compensation rate transmitting the quality of channel of CRS signal and the difference of the quality of downstream data channel, to compensating of the CQI that UE reports, the CQI of downstream data channel can be determined quickly, and then can systematic function be improved.

Fig. 7 shows the schematic block diagram of base station 700 according to another embodiment of the present invention.As shown in Figure 7, base station 700 comprises: transceiver 710 and processor 720.

Transceiver 710 is for receiving a CQI of reported by user equipment UE, and a CQI is that this UE determines according to the common pilot signal CRS of the Serving cell of this UE, and obtains Reference Signal Received Power RSRP corresponding to reference signal that this UE can receive;

Processor 720 this RSRP for obtaining according to transceiver 710, determine compensation rate, this compensation rate for representing the difference of the transmission quality of channel of this CRS and the quality of the downstream data channel of this UE, and according to this compensation rate and a CQI, determines the 2nd CQI of the downstream data channel of this UE.

Therefore, the base station of the embodiment of the present invention, by the RSRP that can receive according to UE, determine the compensation rate transmitting the quality of channel of CRS signal and the difference of the quality of downstream data channel, to compensating of the CQI that UE reports, the CQI of downstream data channel can be determined quickly, and then can systematic function be improved.

Particularly, processor 720 may be used for, and receives the descending RSRP of this UE measurement that this UE reports.

Particularly, this compensation rate can be determine with the SINR of the channel of transmission CRS according to the Signal to Interference plus Noise Ratio SINR of the downstream data channel of UE.

In embodiments of the present invention, this compensation rate can be SINR compensation rate, correspondingly, processor 720 specifically for: according to the mapping relations of CQI and SINR, determine the CQI compensation rate that this SINR compensation rate is corresponding; According to a CQI and this CQI compensation rate, determine the 2nd CQI.

Particularly, when this COMP is single user joint transmission SU-JT, processor 720 specifically for, determine this SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{ServCell}}+{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*{\mathrm{RSRP}}_{\mathrm{ServCell}}}\right]$

Wherein, RSRP _allthe RSRP sum that all reference signals that can receive for UE are corresponding, RSRP _servCellfor UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for UE is to the RSRP of cooperation cell, SINR _{cQI-Compensate}unit be dB.

When COMP is multi-user joint transmission MU-JT, processor 720 specifically for, determine this SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{ServCell}}+{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*{\mathrm{RSRP}}_{\mathrm{ServCell}}}\right]---\left(2\right)$

Wherein, RSRP _allthe RSRP sum that all reference signals that can receive for described UE are corresponding, RSRP _servCellfor UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for described UE is to the RSRP of cooperation cell, described SINR _{cQI-Compensate}unit be dB.Processor 720 specifically for, according to the difference of CQI corresponding to this CQI, this CQI compensation rate and MU-JT and SU-JT, determine the 2nd CQI.

When this COMP be Dynamic Selection send DPS time, and in collaboration set cooperation cell public guide frequency alignment, when the cooperation cell of this UE does not send data-signal, processor 720 specifically for, determine this SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})}\right],$

Wherein, this RSRP _allthe RSRP sum that all reference signals that can receive for this UE are corresponding, RSRP _servCellfor this UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for this UE is to the RSRP of cooperation cell, this SINR _{cQI-Compensate}unit be dB.

When this COMP is cooperative beam figuration CBF, processor 720 specifically for, determine this SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{{\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}}{{\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-(1-\mathrm{\&alpha;})*{\mathrm{RSRP}}_{\mathrm{InCoordinated}}}\right],$

Wherein, this RSRP _allthe RSRP sum that all reference signals that can receive for this UE are corresponding, RSRP _servCellfor this UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for this UE is to the RSRP of cooperation cell, this SINR _{cQI-Compensate}unit be dB, this α is the ratio that transmitting power that the data flow dodged is made in cooperation cell accounts for total transmitting power of this cooperation cell.

Alternatively, as another embodiment, processor 720 is also for the Packet Error Ratio adding up this downstream data channel; When this Packet Error Ratio of this statistical module counts is less than default threshold value, increase by the 2nd CQI; When this Packet Error Ratio of this statistical module counts is greater than this default threshold value, reduce the 2nd CQI.

Should understand, base station 700 according to the embodiment of the present invention may correspond to the base station determined in the COMP of the embodiment of the present invention in the method 100 of CQI, and above-mentioned and other operation of the modules in base station 700 and/or function are respectively in order to realize the corresponding flow process of each method 100 in Fig. 1, for simplicity, do not repeat them here.

Therefore, the base station of the embodiment of the present invention, by the RSRP that can receive according to UE, determine the compensation rate transmitting the quality of channel of CRS signal and the difference of the quality of downstream data channel, to compensating of the CQI that UE reports, the CQI of downstream data channel can be determined quickly, and then can systematic function be improved.

Those of ordinary skill in the art can recognize, in conjunction with unit and the algorithm steps of each example of embodiment disclosed herein description, can realize with electronic hardware, computer software or the combination of the two, in order to the interchangeability of hardware and software is clearly described, generally describe composition and the step of each example in the above description according to function.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can use distinct methods to realize described function to each specifically should being used for, but this realization should not thought and exceeds scope of the present invention.

Those skilled in the art can be well understood to, and for convenience of description and succinctly, the specific works process of the system of foregoing description, device and unit, with reference to the corresponding process in preceding method embodiment, can not repeat them here.

In several embodiments that the application provides, should be understood that disclosed system, apparatus and method can realize by another way.Such as, device embodiment described above is only schematic, such as, the division of described unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.In addition, shown or discussed coupling each other or direct-coupling or communication connection can be indirect coupling by some interfaces, device or unit or communication connection, also can be electric, machinery or other form connect.

The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of unit wherein can be selected according to the actual needs to realize the object of embodiment of the present invention scheme.

In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, and also can be that the independent physics of unit exists, also can be that two or more unit are in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.

Through the above description of the embodiments, those skilled in the art can be well understood to the present invention can use hardware implementing, or firmware realizes, or their compound mode realizes.When implemented in software, above-mentioned functions can be stored in computer-readable medium or as the one or more instruction on computer-readable medium or code and transmit.Computer-readable medium comprises computer-readable storage medium and communication media, and wherein communication media comprises any medium being convenient to transmit computer program from a place to another place.Storage medium can be any usable medium that computer can access.Be not limited to as example: computer-readable medium can comprise RAM, ROM, EEPROM, CD-ROM or other optical disc storage, magnetic disk storage medium or other magnetic storage apparatus or can be used in carrying or storing the expectation with instruction or data structure form program code and can by any other medium of computer access.In addition.Any connection can be suitable become computer-readable medium.Such as, if software be use coaxial cable, optical fiber cable, twisted-pair feeder, Digital Subscriber Line (DSL) or such as infrared ray, radio and microwave and so on wireless technology from website, server or other remote source, so the wireless technology of coaxial cable, optical fiber cable, twisted-pair feeder, DSL or such as infrared ray, wireless and microwave and so on be included in affiliated medium fixing in.As used in the present invention, dish (Disk) and dish (disc) comprise compression laser disc (CD), laser dish, laser disc, Digital Versatile Disc (DVD), floppy disk and Blu-ray Disc, the copy data of the usual magnetic of its mid-game, dish then carrys out the copy data of optics with laser.Combination above also should be included within the protection range of computer-readable medium.

In a word, the foregoing is only the preferred embodiment of technical solution of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (18)

1. determine a method for channel quality indicator CQI in cooperative multipoint transmission COMP, it is characterized in that, comprising:

Receive a CQI of reported by user equipment UE, a described CQI is that described UE determines according to the common pilot signal CRS of the Serving cell of described UE;

Obtain the Reference Signal Received Power RSRP that reference signal that described UE can receive is corresponding;

According to described RSRP, determine compensation rate, described compensation rate is for the difference of the quality of the downstream data channel of the quality and described UE that represent the channel transmitting described CRS;

According to described compensation rate and a described CQI, determine the 2nd CQI of the downstream data channel of described UE.

2. method according to claim 1, is characterized in that,

Described compensation rate determines with the SINR of the channel of the described CRS of transmission according to the Signal to Interference plus Noise Ratio SINR of the downstream data channel of described UE.

3. method according to claim 2, is characterized in that, described compensation rate is SINR compensation rate,

Described according to described compensation rate and a described CQI, determine the 2nd CQI of the downstream data channel of described UE, comprising:

According to the mapping relations of CQI and SINR, determine the CQI compensation rate that described SINR compensation rate is corresponding;

According to a described CQI and described CQI compensation rate, determine described 2nd CQI.

4. method according to claim 3, is characterized in that, when described COMP is single user joint transmission SU-JT, describedly determines compensation rate according to described RSRP, comprising:

Described SINR compensation rate SINR is determined according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{ServCell}}+{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*{\mathrm{RSRP}}_{\mathrm{ServCell}}}\right]$

Wherein, described RSRP _allthe RSRP sum that all reference signals that can receive for described UE are corresponding, RSRP _servCellfor described UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for described UE is to the RSRP of cooperation cell, described SINR _{cQI-Compensate}unit be dB.

5. method according to claim 3, is characterized in that, when described COMP is multi-user joint transmission MU-JT, describedly determines compensation rate according to described RSRP, comprising:

Described SINR compensation rate SINR is determined according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{ServCell}}+{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*{\mathrm{RSRP}}_{\mathrm{ServCell}}}\right]$

Wherein, described RSRP _allthe RSRP sum that all reference signals that can receive for described UE are corresponding, RSRP _servCellfor described UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for described UE is to the RSRP of cooperation cell, described SINR _{cQI-Compensate}unit be dB;

Described according to a described CQI and described CQI compensation rate, determine described 2nd CQI, comprising:

According to the difference of CQI corresponding to described CQI, described CQI compensation rate and MU-JT and SU-JT, determine described 2nd CQI.

6. method according to claim 3, is characterized in that, when described COMP is Dynamic Selection transmission DPS, and the public guide frequency of cooperation cell aligns in collaboration set, when the cooperation cell of described UE does not send data-signal, described according to described RSRP, determine compensation rate, comprising:

Described SINR compensation rate is determined according to following formula,

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})}\right]$

Wherein, described RSRP _allthe RSRP sum that all reference signals that can receive for described UE are corresponding, RSRP _servCellfor described UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for described UE is to the RSRP of cooperation cell, described SINR _{cQI-Compensate}unit be dB.

7. method according to claim 3, is characterized in that, when described COMP is cooperative beam figuration CBF, describedly determines compensation rate according to described RSRP, comprising:

Described SINR compensation rate is determined according to following formula,

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{{\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}}{{\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-(1-\mathrm{\&alpha;})*{\mathrm{RSRP}}_{\mathrm{InCoordinated}}}\right],$

Wherein, described RSRP _allthe RSRP sum that all reference signals that can receive for described UE are corresponding, RSRP _servCellfor described UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for described UE is to the RSRP of cooperation cell, described SINR _{cQI-Compensate}unit be dB, described α is the ratio that transmitting power that the data flow dodged is made in cooperation cell accounts for total transmitting power of described cooperation cell.

8. method according to any one of claim 1 to 7, is characterized in that, also comprises:

Add up the Packet Error Ratio of described downstream data channel;

When described Packet Error Ratio is less than default threshold value, increase described 2nd CQI; Or

When described Packet Error Ratio is greater than described default threshold value, reduce described 2nd CQI.

9. method according to any one of claim 1 to 8, is characterized in that, RSRP corresponding to the reference signal that the described UE of described acquisition can receive comprises:

Receive the descending RSRP of the described UE measurement that described UE reports.

10. a base station, is characterized in that, comprising:

Receiver module, for receiving a CQI of reported by user equipment UE, a described CQI is that described UE determines according to the common pilot signal CRS of the Serving cell of described UE;

Acquisition module, for obtaining Reference Signal Received Power RSRP corresponding to reference signal that described UE can receive;

Determination module, for the described RSRP obtained according to acquisition module, determines compensation rate, and described compensation rate is for the difference of the quality of the downstream data channel of the quality and described UE that represent the channel transmitting described CRS;

Described determination module also for, according to described compensation rate and a described CQI, determine the 2nd CQI of the downstream data channel of described UE.

11. base stations according to claim 10, is characterized in that,

Described compensation rate determines with the SINR of the channel of the described CRS of transmission according to the Signal to Interference plus Noise Ratio SINR of the downstream data channel of described UE.

12. base stations according to claim 11, is characterized in that, described compensation rate is SINR compensation rate,

Described determination module specifically for: according to the mapping relations of CQI and SINR, determine the CQI compensation rate that described SINR compensation rate is corresponding; According to a described CQI and described CQI compensation rate, determine described 2nd CQI.

13. base stations according to claim 12, is characterized in that, when described COMP is single user joint transmission SU-JT, described determination module is specifically for determining described SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{ServCell}}+{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*{\mathrm{RSRP}}_{\mathrm{ServCell}}}\right]$

Wherein, described RSRP _allthe RSRP sum that all reference signals that can receive for described UE are corresponding, RSRP _servCellfor described UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for described UE is to the RSRP of cooperation cell, described SINR _{cQI-Compensate}unit be dB.

14. base stations according to claim 12, is characterized in that, when described COMP is multi-user joint transmission MU-JT, described determination module is specifically for determining described SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{ServCell}}+{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})*{\mathrm{RSRP}}_{\mathrm{ServCell}}}\right]$

Wherein, described RSRP _allthe RSRP sum that all reference signals that can receive for described UE are corresponding, RSRP _servCellfor described UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for described UE is to the RSRP of cooperation cell, described SINR _{cQI-Compensate}unit be dB,

Described determination module specifically for, according to the difference of CQI corresponding to described CQI, described CQI compensation rate and MU-JT and SU-JT, determine described 2nd CQI.

15. base stations according to claim 12, it is characterized in that, when described COMP is Dynamic Selection transmission DPS, and the public guide frequency of cooperation cell aligns in collaboration set, when the cooperation cell of described UE does not send data-signal, described determination module is specifically for determining described SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}})}{({\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-{\mathrm{RSRP}}_{\mathrm{InCoordinated}})}\right]$

Wherein, described RSRP _allthe RSRP sum that all reference signals that can receive for described UE are corresponding, RSRP _servCellfor described UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for described UE is to the RSRP of cooperation cell, described SINR _{cQI-Compensate}unit be dB.

16. base stations according to claim 13, is characterized in that, when described COMP is cooperative beam figuration CBF, described determination module is specifically for determining described SINR compensation rate SINR according to following formula _{cQI-Compensate},

${\mathrm{SINR}}_{\mathrm{CQI}-\mathrm{Compensate}}=10\log \left[\frac{{\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}}{{\mathrm{RSRP}}_{\mathrm{All}}-{\mathrm{RSRP}}_{\mathrm{ServCell}}-(1-\mathrm{\&alpha;})*{\mathrm{RSRP}}_{\mathrm{InCoordinated}}}\right],$

Wherein, described RSRP _allthe RSRP sum that all reference signals that can receive for described UE are corresponding, RSRP _servCellfor described UE is to the RSRP of Serving cell, RSRP _{inCoordinated}for described UE is to the RSRP of cooperation cell, described SINR _{cQI-Compensate}unit be dB, described α is the ratio that transmitting power that the data flow dodged is made in cooperation cell accounts for total transmitting power of described cooperation cell.

17., according to claim 10 to the base station according to any one of 16, is characterized in that, also comprise:

Statistical module, for adding up the Packet Error Ratio of described downstream data channel;

Adjusting module, for when the described Packet Error Ratio of described statistical module counts is less than default threshold value, increases described 2nd CQI; Or, when the described Packet Error Ratio of described statistical module counts is greater than described default threshold value, reduce described 2nd CQI.

18., according to claim 10 to the base station according to any one of 17, is characterized in that, described acquisition module specifically for, receive the descending RSRP that described UE that described UE reports measures.