Background technology
Multipoint cooperative (Cooperation of MultiPoint, CoMP) cooperative groups is made up of a plurality of residential quarters, each residential quarter in each CoMP cooperative groups cooperates mutually provides service for subscriber equipment (UE), UE need feed back the information of all residential quarters that this UE place CoMP cooperative groups comprises to network side to network side feedback cell information the time.
In the mobile communication system that adopts the CoMP feedback mechanism, LTE-A(Long Term Evolution – Advanced for example) in the system, UE is by pilot signal CRS(Cell-specific Reference Signals) or CSIRS(Channel State Information-Reference Signals) Reference Signal Received Power (the Reference Signals Received Power of adjacent residential quarter measured, RSRP) value, the RSRP value that records is fed back to network side, and network side is divided into a CoMP cooperative groups according to the RSRP value of each UE feedback with a plurality of microzonations.
Adopt the LTE-A system of CoMP feedback mechanism also to adopt the DMRS sequence to be used for the demodulation of data.Particularly, the DMRS sequence is carried out precoding with data, and then demodulate the DMRS sequence according to the position of DMRS sequence in coded sequence.
DMRS sequence wherein is:
The initial value of pseudo-random sequence generator c (i) is:
Wherein, n
SCID∈ 0,1}, Downlink Control Information (DownlinkControlInformation, DCI) among the form 2B, n
SCIDBeing the scrambler of dynamic-configuration, namely can be 0 also can be 1, under other situations, and n
SCIDBe 0.n
sBe the time slot sequence number,
Expression rounds downwards divided by 2 gained merchants the time slot sequence number,
Be cell ID,
Be the length of system descending maximum resource piece.
Fig. 1 is the position view of DMRS sequence in coded sequence.
The abscissa of Fig. 1 is the time, and ordinate is frequency, and black box wherein is the DMRS sequence, and the frame of band twill is the CRS signal, and blank box is data.
Adopt the communication system of CoMP cooperative groups when the transmission data, can adopt the JP transmission means, also can adopt the CB/CS transmission means.In the CB/CS transmission means, UE only sends data at main Serving cell, but network side is for the adjacent residential quarter of knowing this main Serving cell in this UE place CoMP cooperative groups disturbed condition to this main Serving cell, in order to carry out user's scheduling and wave beam forming, need UE to feed back the information of all residential quarters in this CoMP cooperative groups.Therefore, the cell information that UE feeds back to network side not only comprises the channel information of main Serving cell, also comprises the channel information of other residential quarters, and the feedack amount is bigger, and the resource that takies is more.
Summary of the invention
In view of this, the purpose of the embodiment of the invention is to provide a kind of method to the network side feedback information and subscriber equipment, to reduce information feedback amount, saves Internet resources.
For achieving the above object, the technical scheme of the embodiment of the invention specifically is achieved in that
A kind of method to the network side feedback information, this method comprises:
User equipment (UE) demodulates the DMRS signal according to the position of DMRS signal in coded sequence from the signal that receives;
Utilize the DMRS scramble sequence of each residential quarter in the current CoMP cooperative groups of living in of this UE that the DMRS signal that this UE demodulates is carried out descrambling, obtain the DMRS signal of each residential quarter in this cooperative groups according to the descrambling result;
The power of the DMRS signal of each residential quarter that calculating UE receives, UE feed back to network side each residential quarter the DMRS signal received power information and select the residential quarter that received power satisfies predetermined condition by network side, or directly select the residential quarter that received power satisfies predetermined condition by UE;
This UE is to the channel information of the residential quarter that the network side feedback is selected.
A kind of subscriber equipment to the network side feedback information, this user equipment (UE) comprise demodulation module, descrambling module, residential quarter selection module and feedback module;
Described demodulation module according to the position of DMRS signal in coded sequence, demodulates the DMRS signal from the signal that receives;
Described descrambling module utilizes the DMRS scramble sequence of each residential quarter in the current CoMP cooperative groups of living in of this UE that the DMRS signal that described demodulation module demodulates is carried out descrambling, obtains the DMRS signal of each residential quarter in this cooperative groups according to the descrambling result;
Module is selected in described residential quarter, the power of the DMRS signal of each residential quarter that calculating UE receives, and the received power that the reception network side is selected satisfies the cell information of predetermined condition, perhaps directly selects the residential quarter that received power satisfies predetermined condition;
Described feedback module feeds back the received power information of DMRS signal of each residential quarter and the channel information of the residential quarter that network side is selected to network side, or only feeds back the channel information of the residential quarter that UE selects.
As seen, the present invention at first demodulates the DMRS signal from the signal that UE receives, the DMRS signal that utilizes the DMRS scramble sequence of each residential quarter in the current CoMP cooperative groups of living in of this UE that this UE is demodulated carries out the DMRS signal that descrambling obtains each residential quarter in this cooperative groups, calculate the received power of the DMRS signal of described each residential quarter, select the residential quarter that received power satisfies predetermined condition by UE or network side, the received power value residential quarter that comes the front predetermined number of bits greater than residential quarter or the received power of predetermined value for example is to the channel information of the residential quarter that the network side feedback is selected.
Wherein the received power of DMRS signal is more big, illustrate that the residential quarter that sends this DMRS signal is more big to the signal interference of main Serving cell in the current CoMP cooperative groups of living in of this UE, received power by selecting its DMRS signal is greater than the residential quarter of predetermined value, can select the residential quarter of the signal of main Serving cell being caused larger interference, just to the network side feedback main Serving cell is disturbed the channel information of bigger residential quarter to the channel information of the residential quarter that the network side feedback is selected, thereby can guarantee on the one hand that network side is known disturbs the channel information of bigger residential quarter to take corresponding interference protection measure to UE master's Serving cell, on the other hand owing to needn't feed back the channel information of all residential quarters in the CoMP cooperative groups to network side, therefore can reduce the feedack amount, thereby save Internet resources.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
UE need feed back the channel information of all residential quarters in the CoMP cooperative groups to network side in the prior art, yet, though some residential quarter is owing to its RSRP value is included in the CoMP cooperative groups greatly, but this residential quarter might be in the not data transmission of the employed running time-frequency resource of main Serving cell UE, though perhaps there are data to send, but these data are disturbed less direction through pointing to after the precoding to main Serving cell specific user, in these cases, this residential quarter is also little to the interference of the UE of main Serving cell, and therefore the UE of main Serving cell does not need to feed back the channel information of this residential quarter.
Because each residential quarter is by carrying out precoding with data and the unification of DMRS sequence, therefore the DMRS signal received power of each residential quarter is more big illustrates that then the signal power of this residential quarter is more big, thereby can cause larger interference to main Serving cell, therefore the present invention selects main Serving cell is disturbed bigger residential quarter by the received power of calculating the DMRS signal, selects the channel information of residential quarter to the network side feedback.
Fig. 2 is the method flow diagram to the network side feedback information provided by the invention.
As shown in Figure 2, this method comprises:
Step 201, UE demodulates the DMRS signal according to the position of DMRS signal in coded sequence from the signal that receives.
Step 202 utilizes the DMRS scramble sequence of each residential quarter in the current CoMP cooperative groups of living in of this UE that the DMRS signal that this UE demodulates is carried out descrambling, obtains the DMRS signal of each residential quarter in this cooperative groups according to the descrambling result.
Step 203, the received power of the DMRS signal of described each residential quarter of calculating is selected received power greater than the residential quarter of predetermined value.
In this step, can directly select received power greater than the residential quarter of predetermined value by UE, also can give network side with the received power feedback information of each residential quarter by UE, select received power greater than the residential quarter of predetermined value by network side according to the received power information of each residential quarter of UE feedback, and then the cell information of selecting is issued UE.
Wherein, the received power information of UE feedback can be actual power information, or the power information that quantizes, or the information of power ordering.
This step also can be to select the residential quarter that received power comes the front predetermined number of bits, that is to say, as long as the received power information of the residential quarter of selecting satisfies predetermined condition.
Step 204, this UE is to the channel information of the residential quarter that the network side feedback is selected.
Wherein, when the DMRS of each residential quarter scramble sequence has when multiple, demodulate every kind of DMRS signal of respective cell respectively according to every kind of DMRS scramble sequence of each residential quarter, calculate the received power of every kind of DMRS signal of each residential quarter respectively, select the received power of any DMRS signal greater than the residential quarter of predetermined value, feed back the channel information of the residential quarter of selecting then to network side.
Wherein, UE is by the RSRP value of the adjacent residential quarter of CRS signal or this UE of CSIRS signal measurement, the RSRP value that calculates is fed back to network side, and network side is according to the definite CoMP cooperative groups of the RSRP value of each UE feedback, and the cell information in the CoMP cooperative groups of determining is issued UE in this cooperative groups.
We can say that the present invention utilizes the CSIRS signal to determine the CoMP cooperative groups, recycling DMRS signal judges that each adjacent residential quarter is to the interference of UE, the channel information of the residential quarter that feedback interference is bigger, to disturbing less residential quarter, no longer feed back its channel information, thereby reduced the feedack amount effectively.
The method of the reduction feedback information volume that the present invention proposes is applicable in the system that adopts CoMP feedback mechanism and employing CB/CS transmission mechanism.
For concrete example the method that the present invention proposes is elaborated below, specifically sees also Fig. 3.
Fig. 3 is the detail flowchart of information feedback method provided by the invention.
As shown in Figure 3, this method comprises:
Step 301, UE measures the RSRP value of adjacent residential quarter according to CRS or CSI-RS, and network side determines the member of CoMP cooperative groups namely all to comprise which residential quarter in the CoMP cooperative groups according to the measurement result of UE.
Step 302, in signals transmission, UE obtains the DMRS scramble sequence on the identical running time-frequency resource in each residential quarter in the CoMP cooperative groups according to formula (1) and formula (2).
Wherein, the n of residential quarter
sIdentical with main Serving cell, n
SCIDDifference value 0 or 1, thus two kinds of DMRS scramble sequence obtained.
Step 303, UE demodulates the DMRS signal according to the position of DMRS signal in coded sequence among Fig. 1 from the signal that receives, utilize the DMRS scramble sequence that obtains in the step 302 that the DMRS signal that demodulates is carried out descrambling, obtains the DMRS signal of each residential quarter.
Wherein, as seen from Figure 1, each residential quarter sends the DMRS signal at identical running time-frequency resource, therefore the DMRS signal that demodulates from the signal that receives of UE is the mixed signal of the DMRS signal of each residential quarter, utilizes the DMRS scramble sequence of each residential quarter that the DMRS signal that demodulates is carried out the DMRS signal that descrambling can obtain each residential quarter.Utilize n
SCIDTwo kinds of DMRS scramble sequence obtaining of value 0 or 1 are carried out the DMRS signal that descrambling can obtain respective cell respectively to the DMRS signal that demodulates respectively respectively.
Step 304, UE calculates the received power of two kinds of DMRS signals behind each residential quarter descrambling.
Step 305, the received power of two kinds of DMRS signals of each residential quarter that UE will calculate compare with threshold value respectively, judge whether two received powers all less than threshold value, if, execution in step 307, otherwise execution in step 306.
In this step, also can give network side with the received power feedback information of two kinds of DMRS signals of each residential quarter by UE, compared with threshold value respectively by the received power of network side with two kinds of DMRS signals of each residential quarter, judge whether that two received powers are all less than threshold value, if, then the information of this residential quarter is not issued UE and execution in step 307, otherwise the information of this residential quarter is issued UE and execution in step 306.
Wherein with received power and threshold value relatively, whether judge two received powers all less than the action of threshold value, also can replace with and judge whether two received powers all come front predetermined number of bits in the received power of each residential quarter.
Step 306, UE reports the channel information of this residential quarter, process ends to network side.
Step 307, UE does not report the channel information of this residential quarter, process ends to network side.
Fig. 4 is user device architecture figure provided by the invention.
As shown in Figure 4, this subscriber equipment comprises demodulation module 401, descrambling module 402, residential quarter selection module 403 and feedback module 404.
Demodulation module 401 according to the position of DMRS signal in coded sequence, demodulates the DMRS signal from the signal that receives.
Descrambling module 402 utilizes the DMRS scramble sequence of each residential quarter in the current CoMP cooperative groups of living in of this UE that the DMRS signal that demodulation module 401 demodulates is carried out descrambling, obtains the DMRS signal of each residential quarter in this cooperative groups according to the descrambling result.
Module 403 is selected in the residential quarter, calculates the received power of the DMRS signal of described each residential quarter, selects received power greater than the residential quarter of predetermined value.
Feedback module 404 is to the channel information of the residential quarter that the network side feedback is selected.
Descrambling module 402 wherein demodulates every kind of DMRS signal of respective cell respectively according to every kind of DMRS scramble sequence of each residential quarter.
Module 403 is selected in the residential quarter, calculates the received power of every kind of DMRS signal of each residential quarter respectively, selects the received power of any DMRS signal greater than the residential quarter of predetermined value.
The present invention selects main Serving cell is disturbed bigger residential quarter by the received power of calculating the DMRS signal, select the channel information of residential quarter to the network side feedback, thereby avoid feeding back to network side the channel information of all residential quarters in the CoMP cooperative groups, reduced the feedack amount.
The above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention, all any modifications of making within the spirit and principles in the present invention, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.