CN102970706A - Selection method and base station for collaborative feedback set - Google Patents

Abstract

The invention discloses a selection method for a collaborative feedback set and an eNodeB. The eNodeB receives reference signal quality parameters of each cell reported by user equipment (UE); corresponding judgment thresholds of each non-serving cell are determined respectively according to the ratio between reference signal quality parameters of each cell and/or serving cell business volume and the business volume of non-serving cells; the eNodeB respectively calculates the differences between the reference signal quality parameters of the serving cells and the reference signal quality parameters of the non-serving cells, the differences obtained by calculation are respectively compared with the corresponding judgment thresholds of each non-serving cell, and if the differences obtained by calculation are smaller than the judgment thresholds, the corresponding non-serving cells are placed in the collaborative feedback set. The judgment thresholds are dynamically adjusted according to the ratio between the reference signal quality parameters and/or serving cell business volume and the business volume of the non-serving cells, compromise between feedback expense and collaborative transmission gain is achieved, and the large collaborative transmission gain is obtained with the small feedback expense.

Description

The system of selection of collaborative feedback collection and base station

Technical field

The present invention relates to wireless communication technology, the system of selection of collaborative feedback collection and the base station of realizing the system of selection of above-mentioned collaborative feedback collection in the collaborative transmission system of particularly a kind of many base stations.

Background technology

At present, many base stations cooperative transmission (CoMP) technology has become one of study hotspot of recent wireless communication system, by a plurality of base stations united dispatched users, transmitted signal, inevitable interference signal between conventional cell can be converted into useful data, thereby further improve the availability of frequency spectrum.

In the collaborative transmission system of many base stations, base station eNodeB at first is UE allocation radio resource management (RRM) measuring set (measurement set) usually, wherein, the RRM measuring set is the set that is made of the residential quarter that needs UE measuring reference signals received power (RSRP); Then, UE will select needs to the residential quarter of eNodeB report RSRP in the RRM measuring set according to predefined report condition, and report the RSRP of these residential quarters to eNodeB; After eNodeB receives the report of UE, determine collaborative feedback collection (CoMP feedback set) and the collaborative feedback collection of determining disposed to UE that according to the RSRP of each residential quarter of UE feedback above-mentioned collaborative feedback collection is the set that is made of the residential quarter that needs UE to its Serving cell feeding back channel state information (CSI); Again then, UE is to the CSI of eNodeB feedback collaborative feedback residential quarter that collection comprises; At last, eNodeB according to the CSI of UE feedback dispatch, precoding and signaling and transfer of data.Those skilled in the art are appreciated that the size of collaborative feedback collection can directly affect the size of cooperative transmission gain usually, and for example, the cooperative transmission gain that collaborative feedback collection larger (residential quarter that comprises is more) can obtain will be larger; On the contrary, collaborative feedback collection less (residential quarter that comprises is fewer) the cooperative transmission gain that can obtain will be less.In addition, the size of collaborative feedback collection also can directly affect the size of feedback overhead, and for example, the larger feedback overhead of collaborative feedback collection will be larger; The less feedback overhead of collaborative feedback collection will be less.Therefore, how to confirm collaborative feedback collection is one of cooperative transmission technology key issue to be solved with equilibrium feedback expense and cooperative transmission gain.

Summary of the invention

In view of this, the invention provides the system of selection of collaborative feedback collection in the collaborative transmission system of a kind of many base stations and the base station of realizing this collaborative transmission method, can realize trading off between the gain of feedback overhead and cooperative transmission, to obtain larger cooperative transmission gain under the less feedback overhead.

A kind of collaborative feedback collection system of selection that the embodiment of the invention provides comprises:

The reference signal quality parameter of the Serving cell of eNodeB reception UE report and the reference signal quality parameter of non-service cell;

ENodeB determines respectively the decision threshold that each non-service cell is corresponding according to the Serving cell of UE report or reference signal quality parameter and/or the Serving cell traffic carrying capacity of non-service cell with the ratio of the traffic carrying capacity of each non-service cell, wherein, described decision threshold is along with the growth of the reference signal quality parameter of Serving cell or non-service cell and/or described traffic carrying capacity ratio and increase;

The difference of the reference signal quality parameter of eNodeB difference calculation services residential quarter and the reference signal quality parameter of described each non-service cell, and with the difference that calculates respectively the decision threshold corresponding with described each non-service cell compare, if the difference that calculates less than decision threshold, is then put into the collaborative feedback collection with the non-service cell of correspondence.

Said method further comprises: eNodeB concentrates the residential quarter of front m the reference signal quality parameter maximum of selection to concentrate as final collaborative feedback from collaborative feedback residential quarter, wherein, m is the maximum number that the collaborative feedback collection can comprise the residential quarter.

Wherein, described eNodeB determines with the ratio of the traffic carrying capacity of each non-service cell that respectively decision threshold corresponding to described each non-service cell comprises according to the Serving cell of UE report or reference signal quality parameter and/or the Serving cell traffic carrying capacity of non-service cell: eNodeB determines a decision threshold according to the reference signal quality parameter of the Serving cell of UE report, and with described decision threshold as decision threshold corresponding to each non-service cell, wherein, described decision threshold increases along with the growth of Serving cell reference signal quality parameter.

ENodeB determines that according to the reference signal quality parameter of the Serving cell of UE report a decision threshold comprises: the corresponding relation of setting up reference signal quality parameter and decision threshold; And determine described decision threshold according to reference signal quality parameter and the described corresponding relation of the Serving cell of UE report.

Wherein, described corresponding relation is functional relation y=f (x), and wherein, x represents the reference signal quality parameter of Serving cell, and y represents decision threshold, and when x1＞x2, guarantees y1-y2=f (x1)-f (x2)＞0.

Perhaps, described eNodeB determines with the ratio of the traffic carrying capacity of each non-service cell that respectively decision threshold corresponding to described each non-service cell comprises according to the Serving cell of UE report or reference signal quality parameter and/or the Serving cell traffic carrying capacity of each non-service cell: eNodeB determines respectively the decision threshold that described each non-service cell is corresponding according to the reference signal quality parameter of described each non-service cell, wherein, the decision threshold that described each non-service cell is corresponding increases along with the growth of the reference signal quality parameter of each non-service cell.

Wherein, eNodeB determines respectively that according to the reference signal quality parameter of described each non-service cell decision threshold corresponding to described each non-service cell comprises: the corresponding relation of setting up reference signal quality parameter and decision threshold; And determine the decision threshold that described non-service cell is corresponding according to reference signal quality parameter and the described corresponding relation of a certain non-service cell of UE report.

Described corresponding relation is functional relation y=f (x), wherein, x represents the reference signal quality parameter of a certain non-service cell, and y represents decision threshold corresponding to this non-service cell, and when x1＞x2, guarantee y1-y2=f (x1)-f (x2)＞0.

Or, described eNodeB determines with the ratio of the traffic carrying capacity of each non-service cell that respectively decision threshold corresponding to described each non-service cell comprises: the ratio of the traffic carrying capacity of eNodeB difference calculation services cell business volume and described each non-service cell according to the Serving cell of UE report or reference signal quality parameter and/or the Serving cell traffic carrying capacity of each non-service cell, and determine respectively decision threshold corresponding to described each non-service cell according to described traffic carrying capacity ratio, wherein, the decision threshold that described each non-service cell is corresponding increases along with the growth of traffic carrying capacity ratio.

Wherein, determine respectively that according to described traffic carrying capacity ratio decision threshold corresponding to described each non-service cell comprises: the corresponding relation of setting up traffic carrying capacity ratio and decision threshold; And determine the decision threshold that this non-service cell is corresponding according to the Serving cell traffic carrying capacity with ratio and the described corresponding relation of the traffic carrying capacity of a certain non-service cell.

Wherein, described corresponding relation is functional relation y=f (x), wherein, x represents the ratio of traffic carrying capacity and a certain non-service cell traffic carrying capacity of Serving cell, y represents decision threshold corresponding to this non-service cell, and when x1＞x2, guarantees y1-y2=f (x1)-f (x2)＞0.

Again or, described eNodeB determines with the ratio of the traffic carrying capacity of each non-service cell that respectively decision threshold corresponding to described each non-service cell comprises: the ratio of the traffic carrying capacity of eNodeB difference calculation services cell business volume and described each non-service cell according to the Serving cell of UE report or reference signal quality parameter and/or the Serving cell traffic carrying capacity of each non-service cell, and determine respectively decision threshold corresponding to described each non-service cell according to the Serving cell of UE report or reference signal quality parameter and the described traffic carrying capacity ratio of each non-service cell, wherein, described decision threshold is along with the growth of the reference signal quality parameter of Serving cell or individual non-service cell and traffic carrying capacity ratio and increase.

Wherein, determine respectively that according to the Serving cell of UE report or reference signal quality parameter and the described traffic carrying capacity ratio of each non-service cell decision threshold corresponding to described each non-service cell comprises: the corresponding relation of setting up reference signal quality parameter, traffic carrying capacity ratio and decision threshold; And determine the decision threshold that this non-service cell is corresponding according to reference signal quality parameter, the Serving cell traffic carrying capacity of Serving cell or a certain non-service cell with ratio and the described corresponding relation of the traffic carrying capacity of a certain non-service cell.

Wherein, described corresponding relation is functional relation y=f (xa, xb), and wherein, xa represents the Serving cell of UE report or the reference signal quality parameter of certain non-service cell; Xb represents the traffic carrying capacity ratio of Serving cell and certain non-service cell; Y represents decision threshold corresponding to this non-service cell, and when xa1 〉=xa2 and xb1 〉=xb2, guarantees y1-y2=f (xa1, xb1)-f (xa2, xb2) 〉=0.

Above-mentioned corresponding relation also can be recorded in the form.

Described reference signal quality parameter comprises: Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ).

A kind of eNodeB that the embodiment of the invention provides comprises:

Reference signal quality parameter receiving element be used for to receive user's the reference signal quality parameter of Serving cell of UE report and the reference signal quality parameter of non-service cell;

The decision threshold determining unit, be used for determining respectively the decision threshold that described each non-service cell is corresponding according to the Serving cell of UE report or reference signal quality parameter and/or the service business amount of each non-service cell with the ratio of the traffic carrying capacity of each non-service cell, wherein, described decision threshold is along with the growth of the reference signal quality parameter of Serving cell or each non-service cell and/or traffic carrying capacity ratio and increase;

Collaborative feedback collection determining unit, the difference that is used for the reference signal quality parameter of the reference signal quality parameter of calculation services residential quarter respectively and described each non-service cell, and the decision threshold that the difference that calculates is corresponding with described each non-service cell compares, if the difference that calculates less than decision threshold, is then put into the collaborative feedback collection with corresponding non-service cell.

Above-mentioned eNodeB further comprises:

The big or small limiting unit of collaborative feedback collection is used for from the concentrated concentrated residential quarter of the final collaborative feedback of residential quarter conduct of selecting front m reference signal quality parameter maximum of collaborative feedback, and wherein, m is the maximum number that the collaborative feedback collection can comprise the residential quarter.

Wherein, the decision threshold determining unit comprises: the first module, be used for determining respectively decision threshold corresponding to each non-service cell according to the Serving cell of UE report or the reference signal quality parameter of each non-service cell, wherein, described decision threshold increases along with the growth of the reference signal quality parameter of Serving cell or each non-service cell.

Perhaps, the decision threshold determining unit comprises: traffic carrying capacity ratio calculation module, for the ratio of the traffic carrying capacity of distinguishing calculation services cell business volume and each non-service cell; The second module is used for determining respectively decision threshold corresponding to described each non-service cell according to described traffic carrying capacity ratio that wherein, described decision threshold increases along with the growth of traffic carrying capacity ratio.

Or the decision threshold determining unit comprises: traffic carrying capacity ratio calculation module, for the ratio of the traffic carrying capacity of distinguishing calculation services cell business volume and each non-service cell; The 3rd module, be used for determining respectively decision threshold corresponding to described each non-service cell according to the Serving cell of UE report or reference signal quality parameter and the described traffic carrying capacity ratio of each non-service cell, wherein, described decision threshold is along with the growth of the reference signal quality parameter of Serving cell or each non-service cell and traffic carrying capacity ratio and increase.

The another kind of collaborative feedback collection system of selection that the embodiment of the invention provides comprises:

The reference signal quality parameter of the Serving cell of eNodeB reception UE report and the reference signal quality parameter of non-service cell;

ENodeB calculates respectively the capacity gain that each non-service cell can obtain according to the Serving cell of UE report and the reference signal quality parameter of non-service cell when participating in cooperative transmission; And

ENodeB judges that respectively the capacity gain of each residential quarter whether greater than the capacity gain thresholding that sets in advance, if so, then puts into the collaborative feedback collection with corresponding non-service cell.

Wherein, eNodeB calculates respectively the capacity gain that each residential quarter can obtain according to the reference signal quality parameter of each residential quarter of UE report and comprises when participating in cooperative transmission:

ENodeB calculates respectively user capacity and the user capacity when not participating in cooperative transmission of each non-service cell when participating in cooperative transmission according to the reference signal quality parameter of each residential quarter of UE report;

ENodeB calculates respectively the difference of the user capacity of each non-service cell when participating in cooperative transmission and user capacity when not participating in cooperative transmission, and the difference of the user capacity that described each non-service cell is corresponding and the ratio of the user capacity of this non-service cell when not participating in cooperative transmission are as capacity gain corresponding to this non-service cell respectively.

The user capacity of described each non-service cell when participating in cooperative transmission passes through formula $C_{\mathrm{CoMP}}={\log }_2(1+\frac{{\mathrm{RSRP}}_S+{\mathrm{RSRP}}_C}{\mathrm{ICI}+N})$ Calculate;

The user capacity of described each non-service cell when not participating in cooperative transmission passes through formula $C_{\mathrm{non}-\mathrm{CoMP}}={\log }_2(1+\frac{{\mathrm{RSRP}}_S}{{\mathrm{RSRP}}_C+\mathrm{ICI}+N})$ Calculate;

Wherein, RSRP _SThe Reference Signal Received Power RSRP of Serving cell, RSRP _CThe RSRP of certain non-service cell; ICI is the presence of intercell interference outside Serving cell and this non-service cell; N is noise.

In addition, if the cooperative transmission technology that hypothesis adopts multi-point joint to process, the user capacity of described each non-service cell when participating in cooperative transmission passes through formula

Calculate;

If suppose to adopt the cooperative transmission technology of cooperative scheduling/collaborative wave beam forming, the user capacity of described each non-service cell when participating in cooperative transmission passes through formula Calculate;

The user capacity of described each non-service cell when not participating in cooperative transmission passes through formula $C_{\mathrm{non}-\mathrm{CoMP}}={\log }_2(1+\frac{{\mathrm{RSRP}}_S}{{\mathrm{RSRP}}_C+\mathrm{ICI}+N})$ Calculate;

Wherein, RSRP _SThe RSRP of Serving cell, RSRP _CThe RSRP of certain non-service cell; ICI is the presence of intercell interference outside Serving cell and this non-service cell; N is noise.

The another kind of eNodeB that the embodiment of the invention provides comprises:

Reference signal quality parameter receiving element is for the reference signal quality parameter of the Serving cell that receives user terminal UE report and the reference signal quality parameter of non-service cell;

The capacity gain determining unit is used for calculating respectively the capacity gain that each non-service cell can obtain according to the Serving cell of UE report and the reference signal quality parameter of non-service cell when participating in cooperative transmission; And

The second collaborative feedback collection determining unit, whether the capacity gain that is used for judging each non-service cell if so, then with corresponding non-service cell puts into collaborative feedback collection greater than the capacity gain thresholding that sets in advance.

Another collaborative feedback collection system of selection that the embodiment of the invention provides comprises:

The reference signal quality parameter of the Serving cell of eNodeB reception UE report and the reference signal quality parameter of non-service cell;

The difference of the reference signal quality parameter of eNodeB difference calculation services residential quarter and the reference signal quality parameter of each non-service cell is respectively as reference signal quality parameter difference corresponding to each non-service cell;

ENodeB respectively reference signal quality parameter difference that each non-service cell is corresponding compares with the first thresholding that sets in advance, and respectively reference signal quality parameter and predefined second thresholding of each non-service cell compared, if reference signal quality parameter difference corresponding to certain non-service cell greater than the second thresholding that sets in advance, then put into the collaborative feedback collection with corresponding non-service cell less than the first thresholding or certain non-service cell reference signal quality parameter.

Said method further comprises: the cumulative distribution function CDF of statistics Serving cell reference signal quality parameter; A percentage set point is set; And according to the CDF of Serving cell reference signal quality parameter, the reference signal quality parameter value the when cumulative distribution that the second thresholding is set as the reference signal quality parameter of Serving cell equals described percentage set point.

Another eNodeB that the embodiment of the invention provides comprises:

Reference signal quality parameter receiving element is for the reference signal quality parameter of the Serving cell that receives user terminal UE report and the reference signal quality parameter of non-service cell;

Reference signal quality parameter difference determining unit is used for the difference of the reference signal quality parameter of the reference signal quality parameter of calculation services residential quarter respectively and each non-service cell, respectively as reference signal quality parameter difference corresponding to each non-service cell;

The 3rd collaborative feedback collection determining unit, being used for reference signal quality parameter difference corresponding to each non-service cell compares with the first thresholding that sets in advance, and respectively reference signal quality parameter and predefined second thresholding of each non-service cell compared, if reference signal quality parameter difference corresponding to certain non-service cell greater than the second thresholding that sets in advance, then put into the collaborative feedback collection with corresponding non-service cell less than the first thresholding or certain non-service cell reference signal quality parameter.

Above-mentioned eNodeB further comprises: the second thresholding adjustment unit is used for dynamically adjusting described the second thresholding according to the cumulative distribution of Serving cell reference signal quality parameter.

In the present invention, according to one embodiment of present invention, eNodeB can be according to the size of RSRP and/or the ratio dynamic adjustments decision threshold of own service amount and each cell business volume of self, the larger decision threshold of selection when large and/or self the ratio of traffic carrying capacity and a certain cell business volume is larger at eNodeB self RSRP, make that the residential quarter of eNodeB periphery is easier carries out cooperative transmission with eNode, less and/or self traffic carrying capacity and the ratio of each cell business volume hour is selected less decision threshold and at eNodeB self RSRP, carry out cooperative transmission so that the residential quarter of eNodeB periphery is more difficult with eNode, thereby can realize trading off between the gain of feedback overhead and cooperative transmission, to obtain larger cooperative transmission gain under the less feedback overhead.

According to another embodiment of the invention, eNodeB determines whether this non-service cell is added the collaborative feedback collection by the size of the capacity gain that certain non-service cell can obtain when participating in cooperative transmission, can guarantee to only have capacity gain can add the collaborative feedback collection greater than the residential quarter of the capacity gain thresholding that sets in advance, therefore, can realize trading off preferably between cooperative transmission gain and the feedback overhead.And this method only need arrange a fixing capacity gain thresholding, and need not under the heterogeneous networks scene this capacity gain to be adjusted, and therefore, implements very simple.

In addition, according to still another embodiment of the invention, eNodeB is by arranging two fixing thresholdings, one side guarantees in the less situation of the difference of the reference signal quality parameter of Serving cell and certain non-service cell this non-service cell to be added the collaborative feedback collection, guarantee on the other hand also this non-service cell to be added the collaborative feedback collection when reference signal quality parameter of certain non-service cell self is larger, thereby can effectively increase the gain of cooperative transmission, realize between cooperative transmission gain and the feedback overhead compromise preferably.

Description of drawings

Fig. 1 a is a traditional heterogeneous network schematic diagram;

Fig. 1 b is in the heterogeneous network shown in Fig. 1 a, the relation of the RSRP that the position at UE place and UE measure;

Fig. 2 a is an asymmetric homogeneous network schematic diagram of traffic carrying capacity;

Fig. 2 b is in the homogeneous network shown in Fig. 2 a, the relation of the RSRP that the position at UE place and UE measure;

Fig. 3 is a kind of collaborative feedback collection system of selection flow chart of the present invention;

Fig. 4 is the eNodeB internal structure schematic diagram of a kind of collaborative feedback collection of realization of the present invention system of selection;

Fig. 5 is the embodiment of the invention 1 described collaborative feedback collection system of selection flow chart;

Fig. 6 is the eNodeB internal structure schematic diagram of the embodiment of the invention 1 described realization collaborative feedback collection system of selection;

Fig. 7 is the embodiment of the invention 2 described collaborative feedback collection system of selection flow charts;

Fig. 8 is the eNodeB internal structure schematic diagram of the embodiment of the invention 2 described realization collaborative feedback collection systems of selection;

Fig. 9 is the embodiment of the invention 3 described collaborative feedback collection system of selection flow charts;

Figure 10 is the eNodeB internal structure schematic diagram of the embodiment of the invention 3 described realization collaborative feedback collection systems of selection;

Figure 11 is another kind of collaborative feedback collection system of selection flow chart of the present invention;

Figure 12 is the eNodeB internal structure schematic diagram of the another kind of collaborative feedback collection of realization of the present invention system of selection;

Figure 13 is another collaborative feedback collection system of selection flow chart of the present invention;

Figure 14 is the eNodeB internal structure schematic diagram of another collaborative feedback collection system of selection of realization of the present invention.

Embodiment

In the collaborative transmission system of existing many base stations, receive the RSRP of all residential quarters of UE report as eNodeB after, eNodeB at first distinguishes the difference of the RSRP of the RSRP of calculation services residential quarter and each residential quarter that UE reports, and with the difference that calculates and a fixed threshold that sets in advance (for example, 3dB) compare, if the difference that calculates is less than this fixed threshold, then candidate collection is put in the residential quarter that this difference is corresponding; At last, the residential quarter that concentrate as collaborative feedback the residential quarter of m RSRP maximum before selecting successively from candidate collection again, wherein, m is the maximum number that the collaborative feedback collection can comprise the residential quarter.

Can find by research, above-mentionedly determine that based on fixed threshold symmetrical network that the method for candidate collection and then definite collaborative feedback collection is only applicable to have symmetrical RSRP and symmetrical service amount (for example, homogeneous network with same base through-put power and same paths fissipation factor), but, for the heterogeneous network with asymmetric RSRP or have isomorphism or the heterogeneous network of asymmetric traffic and be not suitable for.For example, in heterogeneous network as shown in Figure 1a, residential quarter A is the Serving cell of UE, and residential quarter B is the Microcell in the A coverage of residential quarter.The residential quarter A that UE measures and the RSRP of residential quarter B are shown in Fig. 1 b.In Fig. 1 b, transverse axis represents the position of UE, and the longitudinal axis represents the received power of UE.Can find out that from Fig. 1 a and Fig. 1 b when UE was between residential quarter A and residential quarter B, the absolute value of the RSRP of residential quarter A and residential quarter B was all relatively high, though this moment residential quarter A Reference Signal Received Power RSRP _AReference Signal Received Power RSRP with residential quarter B _BDifference (for example, 3dB), this moment residential quarter B is added the collaborative feedback collection and still can obtain larger cooperative transmission gain greater than the fixed threshold that sets in advance; And when UE is arranged in position away from residential quarter A and residential quarter B (right side of Fig. 1 a), the absolute value of the RSRP of residential quarter A and residential quarter B is all relatively low, though this moment residential quarter A Reference Signal Received Power RSRP _AReference Signal Received Power RSRP with residential quarter B _BDifference (for example, 3dB), it is also very little that residential quarter B is added the cooperative transmission gain that the collaborative feedback collection can obtain less than the fixed threshold that sets in advance.Again for example, in the homogeneous network shown in Fig. 2 a, the traffic carrying capacity of residential quarter A is higher, and the traffic carrying capacity of residential quarter B is lower, at this moment, residential quarter A is difficult to available free resource and residential quarter B works in coordination with the interior UE the transmission of data for residential quarter B, and residential quarter B will have a lot of idling-resources and residential quarter A to work in coordination with the interior UE the transmission of data for residential quarter A.Therefore, (for example, 3dB) mode determines that Candidate Set neither be most suitable if still adopt fixed threshold this moment.

In order to address the above problem, the base station that the invention provides the system of selection of multiple collaborative feedback collection and realize this collaborative transmission method, can realize better trading off between the gain of feedback overhead and cooperative transmission, namely to obtain larger cooperative transmission gain under the less feedback overhead.

Fig. 3 has shown the flow process of a kind of collaborative feedback collection provided by the present invention system of selection.As shown in Figure 3, mainly comprise:

The reference signal quality parameter of the Serving cell of step 301:eNodeB reception UE report and the reference signal quality parameter of non-service cell;

Step 302:eNodeB determines respectively the decision threshold that described each non-service cell is corresponding according to the Serving cell of UE report or reference signal quality parameter and/or the Serving cell traffic carrying capacity of each non-service cell with the ratio of the traffic carrying capacity of each non-service cell, wherein, the decision threshold that described each non-service cell is corresponding increases along with the growth of Serving cell or each non-service cell reference signal quality parameter and/or above-mentioned traffic carrying capacity ratio;

The difference of the reference signal quality parameter of step 303:eNodeB difference calculation services residential quarter and the reference signal quality parameter of described each non-service cell, and with the difference that calculates respectively the decision threshold corresponding with described each non-service cell compare, if the difference that calculates less than decision threshold, is then put into the collaborative feedback collection with the non-service cell of correspondence.

The method can further include:

Step 304:eNodeB concentrates the residential quarter of front m the reference signal quality parameter maximum of selection to concentrate as final collaborative feedback from collaborative feedback residential quarter, wherein, m is the maximum number that the collaborative feedback collection can comprise the residential quarter.

In this step 304, eNodeB can sort the size of the residential quarter in the candidate collection according to the reference signal quality parameter first, and then the residential quarter that concentrate as collaborative feedback the residential quarter of m reference signal quality parameter maximum before selecting.

After having determined the collaborative feedback collection, eNodeB disposes the collaborative feedback collection of determining to UE, and behind the CSI of the collaborative feedback residential quarter that collection comprises that receives the UE feedback, the CSI that feeds back according to UE dispatches, precoding and signaling and transfer of data.

Corresponding said method, the present invention also provides the eNodeB that realizes said method, and as shown in Figure 4, the internal main of this base station will comprise:

Reference signal quality parameter receiving element 401 is for the reference signal quality parameter of the Serving cell that receives the UE report and the reference signal quality parameter of non-service cell;

Decision threshold determining unit 402, be used for determining respectively the decision threshold that described each non-service cell is corresponding according to the Serving cell of UE report or reference signal quality parameter and/or the service business amount of each non-service cell with the ratio of the traffic carrying capacity of each non-service cell, wherein, the decision threshold that described each non-service cell is corresponding increases along with the growth of the reference signal quality parameter of the Serving cell of UE report or each non-service cell and/or above-mentioned traffic carrying capacity ratio;

Collaborative feedback collection determining unit 403, the difference that is used for the reference signal quality parameter of the reference signal quality parameter of calculation services residential quarter respectively and described each non-service cell, and the decision threshold that the difference that calculates is corresponding with described each non-service cell compares, if the difference that calculates less than decision threshold, is then put into the collaborative feedback collection with corresponding non-service cell.

Above-mentioned eNodeB can further include:

The big or small limiting unit of collaborative feedback collection is used for from the concentrated concentrated residential quarter of the final collaborative feedback of residential quarter conduct of selecting front m reference signal quality parameter maximum of collaborative feedback, and wherein, m is the maximum number that the collaborative feedback collection can comprise the residential quarter.

In the present invention, eNodeB can be according to the size of each cell reference signals mass parameter and/or the Serving cell traffic carrying capacity decision threshold corresponding with each non-service cell of ratio dynamic adjustments of each non-service cell traffic carrying capacity, in the reference signal quality of Serving cell better and/or the ratio of the traffic carrying capacity of Serving cell and a certain non-service cell traffic carrying capacity larger decision threshold of selection when larger, carry out cooperative transmission so that non-service cell is easier with eNode, thereby can obtain the gain of higher cooperative transmission, and the ratio of the traffic carrying capacity of and/or Serving cell relatively poor in the reference signal quality of Serving cell and a certain non-service cell traffic carrying capacity is than hour less decision threshold of selection, carry out cooperative transmission so that non-service cell is more difficult with eNode, thereby reduce feedback overhead.

In the present invention, the reference signal quality parameter comprises: Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ).

Describe below in conjunction with specific embodiments said method in detail.In the example below, being RSRP take the reference signal quality parameter all describes as example.Need to prove, in the application of reality, use RSRQ to replace RSRP also can realize technical scheme of the present invention as the reference signal quality parameter, just do not repeat for example to understand at this.

Embodiment 1:

The system of selection of the collaborative feedback collection that present embodiment provides is determined above-mentioned decision threshold according to the Serving cell of UE report or the RSRP of non-service cell, and its realization flow mainly comprises as shown in Figure 5:

The RSRP of the Serving cell of step 3011:eNodeB reception UE report and the RSRP of each non-service cell;

Step 3021:eNodeB determines respectively decision threshold corresponding to each non-service cell according to the Serving cell of UE report or the RSRP of each non-service cell, and wherein, above-mentioned decision threshold increases along with the growth of the RSRP of each residential quarter;

Particularly, in this step, eNodeB can determine a decision threshold according to the RSRP of the Serving cell of UE report, and with this decision threshold as decision threshold corresponding to each non-service cell, wherein, above-mentioned decision threshold increases along with the growth of the RSRP of Serving cell.

Perhaps, in this step, eNodeB can be respectively determines respectively the corresponding decision threshold of each non-service cell according to the RSRP of each non-service cell of UE report, and wherein, decision threshold corresponding to each non-service cell increases along with the growth of the RSRP of each non-service cell respectively;

The difference of the RSRP of step 3031:eNodeB difference calculation services residential quarter and the RSRP of each non-service cell, and the decision threshold that the difference that calculates is corresponding with each non-service compares, if the difference that calculates is then put into the cooperative transmission collection with the non-service cell of correspondence less than decision threshold corresponding to this non-service cell.

As previously mentioned, said method can further include above-mentioned steps 304.

After having determined the collaborative feedback collection, eNodeB disposes the collaborative feedback collection of determining to UE, and behind the CSI of the collaborative feedback residential quarter that collection comprises that receives the UE feedback, the CSI that feeds back according to UE dispatches, precoding and signaling and transfer of data.

The below describes above-mentioned steps 3021 described eNodeB in detail again and determines the method for decision threshold according to self RSRP of UE report, and the method comprises:

At first, set up the RSRP of Serving cell or each non-service cell and the corresponding relation of decision threshold;

Then, determine above-mentioned decision threshold according to RSRP and the described corresponding relation of the Serving cell of UE report.

Wherein, above-mentioned corresponding relation can be a kind of functional relation, for example y=f (x), wherein, x represents the RSRP of Serving cell or each non-service cell, and y represents decision threshold corresponding to each non-service cell, and when x1＞x2, guarantee y1-y2=f (x1)-f (x2)＞0.Particularly, above-mentioned functional relation can be

Wherein, k is constant.Or above-mentioned corresponding relation can be form as shown in table 1 below.

The RSRP of Serving cell or certain non-service cell	Decision threshold
		-50dBm	15dB
-75dBm	10dB
		.. .	...

Table 1

Those skilled in the art will appreciate that if select the mode of above table will be more simple in realization.

Corresponding said method, the present invention also provides the eNodeB that realizes said method, and as shown in Figure 6, the internal main of this base station will comprise reference signal quality parameter receiving element 401, decision threshold determining unit 402 and collaborative feedback collection determining unit 403.Wherein, decision threshold determining unit 402 inside comprise: the first module 4021, according to the reference signal quality parameter of the Serving cell of UE report or each non-service cell (for example be used for, RSRP) determine respectively decision threshold corresponding to each non-service cell, wherein, the decision threshold that described each non-service cell is corresponding increases along with the growth of the reference signal quality parameter of the Serving cell of UE report or each non-service cell.Other unit, the unit that for example has same numeral among reference signal quality parameter receiving element 401 and collaborative feedback collection determining unit 403 and Fig. 4 has identical function, is not giving unnecessary details at this.

Can find out from the system of selection of above-mentioned collaborative feedback collection and the internal structure of eNodeB, eNodeB is according to the size of the RSRP dynamic adjustments decision threshold of the Serving cell of UE report or each non-service cell, concrete is, when Serving cell or certain non-service cell RSRP are larger, select larger decision threshold, carry out cooperative transmission so that non-service cell is easier with eNode, thereby improve the gain of cooperative transmission, and hour select a less decision threshold at the RSRP of Serving cell or each non-service cell, carry out cooperative transmission so that non-service cell is more difficult with eNode, thereby reduce feedback overhead.

Embodiment 2:

The system of selection of the collaborative feedback collection that present embodiment provides is determined the decision threshold that each non-service cell is corresponding according to the Serving cell traffic carrying capacity with the ratio of non-service cell traffic carrying capacity, and its realization flow mainly comprises as shown in Figure 7:

The RSRP of the Serving cell of step 3011:eNodeB reception UE report and the RSRP of each non-service cell;

The ratio of the traffic carrying capacity of step 3022:eNodeB difference calculation services cell business volume and each non-service cell, and determine respectively decision threshold corresponding to each non-service cell according to above-mentioned traffic carrying capacity ratio, wherein, above-mentioned decision threshold increases along with the growth of traffic carrying capacity ratio;

The difference of the RSRP of step 3031:eNodeB difference calculation services residential quarter and the RSRP of each non-service cell, and the decision threshold that the difference that calculates is corresponding with each non-service cell compares, if the difference that calculates less than decision threshold, is then put into the collaborative feedback collection with corresponding non-service cell.

Said method can further include above-mentioned steps 304.

After having determined the collaborative feedback collection, eNodeB disposes the collaborative feedback collection of determining to UE, and behind the CSI of the collaborative feedback residential quarter that collection comprises that receives the UE feedback, the CSI that feeds back according to UE dispatches, precoding and signaling and transfer of data.

The below determines the method for the decision threshold that each non-service cell is corresponding according to above-mentioned traffic carrying capacity ratio describing above-mentioned steps 3022 described eNodeB in detail, and the method mainly comprises:

At first, set up corresponding relation between traffic carrying capacity ratio and the decision threshold;

Then, eNodeB respectively determines decision threshold that each non-service cell corresponding with ratio and the traffic carrying capacity ratio of each non-service cell traffic carrying capacity with the corresponding relation between the decision threshold according to the Serving cell traffic carrying capacity of calculating.

Wherein, above-mentioned corresponding relation can be a kind of functional relation, y=f (x) for example, wherein, x represents the ratio of Serving cell and certain non-service cell traffic carrying capacity, y represents decision threshold corresponding to this non-service cell, and when x1＞x2, guarantees y1-y2=f (x1)-f (x2)＞0.Particularly, above-mentioned functional relation can be Wherein, k is constant.Or above-mentioned corresponding relation can be form as shown in table 2 below.

Traffic carrying capacity ratio	Decision threshold
		5	15dB
2	10dB
		...	...

Table 2

Those skilled in the art will appreciate that if select the above table mode will be more simple in realization.

Corresponding said method, the present invention also provides the eNodeB that realizes said method, and as shown in Figure 8, the internal main of this base station will comprise: reference signal quality parameter receiving element 401, decision threshold determining unit 402 and collaborative feedback collection determining unit 403.Wherein, decision threshold determining unit 402 comprises: traffic carrying capacity ratio calculation module 4022, for the ratio of the traffic carrying capacity of distinguishing calculation services cell business volume and each non-service cell; The second module 4023 is used for determining respectively decision threshold corresponding to described each non-service cell according to described traffic carrying capacity ratio that wherein, described decision threshold increases along with the growth of traffic carrying capacity ratio.Other unit, the unit that for example has same numeral among reference signal quality parameter receiving element 401 and collaborative feedback collection determining unit 403 and Fig. 4 has identical function, is not giving unnecessary details at this.

Can find out from the system of selection of above-mentioned collaborative feedback collection and the internal structure of eNodeB, eNodeB is according to the size of the ratio dynamic adjustments decision threshold of Serving cell traffic carrying capacity and non-service cell traffic carrying capacity, concrete is, when the ratio of Serving cell traffic carrying capacity and non-service cell traffic carrying capacity is larger, select larger decision threshold, carry out cooperative transmission so that non-service cell is easier with eNode, thereby obtain the gain of higher cooperative transmission, and hour select a less decision threshold at the ratio of Serving cell traffic carrying capacity and non-service cell cell business volume, carry out cooperative transmission so that non-service cell is more difficult with eNode, thereby reduce feedback overhead.

Embodiment 3:

Present embodiment provides a kind of system of selection of collaborative feedback collection, determine the decision threshold that each non-service cell is corresponding according to the RSRP of the Serving cell of UE report or RSRP and the Serving cell traffic carrying capacity of non-service cell with the traffic carrying capacity ratio of each non-service cell traffic carrying capacity, its realization flow mainly comprises as shown in Figure 9:

The RSRP of the Serving cell of step 3011:eNodeB reception UE report and the RSRP of each non-service cell;

The ratio of the traffic carrying capacity of step 3023:eNodeB difference calculation services cell business volume and each non-service cell, and determine respectively decision threshold corresponding to each non-service cell according to the RSRP of Serving cell or non-service cell and above-mentioned traffic carrying capacity ratio, wherein, above-mentioned decision threshold is along with the growth of the RSRP of Serving cell and traffic carrying capacity ratio and increase;

The difference of the RSRP of step 3031:eNodeB difference calculation services residential quarter and the RSRP of each non-service cell, and with the difference that calculates respectively the decision threshold corresponding with each non-service cell compare, if the difference that calculates less than decision threshold, is then put into the collaborative feedback collection with corresponding non-service cell.

As previously mentioned, said method can further include above-mentioned steps 304.

After having determined the collaborative feedback collection, eNodeB disposes the collaborative feedback collection of determining to UE, and behind the CSI of the collaborative feedback residential quarter that collection comprises that receives the UE feedback, the CSI that feeds back according to UE dispatches, precoding and signaling and transfer of data.

The method that the below determines the decision threshold that each non-service cell is corresponding at detailed description above-mentioned steps 3023 described eNodeB according to RSRP and the traffic carrying capacity ratio of Serving cell, the method mainly comprises:

At first, set up corresponding relation between RSRP, traffic carrying capacity ratio and the decision threshold;

Then, eNodeB determines above-mentioned decision threshold according to the RSRP of Serving cell or non-service cell with ratio and the above-mentioned corresponding relation of the traffic carrying capacity of service cell business volume and each non-service cell.

Wherein, above-mentioned corresponding relation can be a kind of functional relation, y=f (xa, xb) for example, and wherein, xa represents the RSRP of Serving cell or certain non-service cell; Xb represents the ratio of Serving cell and certain non-service cell traffic carrying capacity; Y represents decision threshold corresponding to this non-service cell, and when xa1 〉=xa2 and xb1 〉=xb2, guarantees y1-y2=f (xa1, xb1)-f (xa2, xb2) 〉=0.Or above-mentioned corresponding relation can be form as shown in table 3 below.

Table 3

Those skilled in the art will appreciate that if select the above table mode will be more simple in realization.

Corresponding said method, the present invention also provides the eNodeB that realizes said method, and as shown in figure 10, the internal main of this base station will comprise: reference signal quality parameter receiving element 401, decision threshold determining unit 402 and collaborative feedback collection determining unit 403.Wherein, decision threshold determining unit 402 comprises: traffic carrying capacity ratio calculation module 4022, for the ratio of the traffic carrying capacity of distinguishing calculation services cell business volume and each non-service cell; The 3rd module 4024, be used for determining respectively decision threshold corresponding to described each non-service cell according to the Serving cell of UE report or reference signal quality parameter and the described traffic carrying capacity ratio of each non-service cell, wherein, described decision threshold increases along with the growth of the reference signal quality parameter of the Serving cell of UE report or each non-service cell and traffic carrying capacity ratio.Other unit, the unit that for example has same numeral among reference signal quality parameter receiving element 401 and collaborative feedback collection determining unit 403 and Fig. 4 has identical function, is not giving unnecessary details at this.

Can find out from the system of selection of above-mentioned collaborative feedback collection and the internal structure of eNodeB, eNodeB is according to the size of the ratio dynamic adjustments decision threshold of Serving cell or each non-service cell RSRP and Serving cell traffic carrying capacity and each non-service cell traffic carrying capacity, concrete is, the larger decision threshold of selection when the traffic carrying capacity of and Serving cell large at the RSRP of Serving cell or certain non-service cell is larger with the ratio of certain non-service cell traffic carrying capacity, carry out cooperative transmission so that non-service cell is easier with eNode, thereby obtain the gain of higher cooperative transmission, and at Serving cell or certain non-service cell RSRP is less and the ratio of the traffic carrying capacity of Serving cell and certain non-service cell traffic carrying capacity hour is selected a less decision threshold, carry out cooperative transmission so that non-service cell is more difficult with eNode, thereby reduce feedback overhead.

Except such scheme, the present invention also provides the system of selection of another kind of collaborative feedback collection, and its flow process mainly comprises as shown in figure 11:

The reference signal quality parameter of the Serving cell of step 301:eNodeB reception UE report and the reference signal quality parameter of non-service cell;

Step 1101:eNodeB calculates respectively the capacity gain that each non-service cell can obtain according to the reference signal quality parameter of each residential quarter of UE report when participating in cooperative transmission;

This step can specifically comprise:

At first, eNodeB calculates respectively user capacity and the user capacity when not participating in cooperative transmission of each non-service cell when participating in cooperative transmission according to the reference signal quality parameter (for example, RSRP or RSRQ) of each residential quarter of UE report;

Then, eNodeB calculates respectively the difference of the user capacity of each non-service cell when participating in cooperative transmission and user capacity when not participating in cooperative transmission, and the ratio of the user capacity the when difference of described user capacity is not participated in cooperative transmission with this non-service cell is respectively as capacity gain corresponding to this non-service cell.

Particularly, the user capacity of certain non-service cell when participating in cooperative transmission can calculate by following formula (1):

$C_{\mathrm{CoMP}}={\log }_2(1+\frac{{\mathrm{RSRP}}_S+{\mathrm{RSRP}}_C}{\mathrm{ICI}+N})---\left(1\right)$

Wherein, RSRP _SThe RSRP of Serving cell; RSRP _CThe RSRP of certain non-service cell; ICI is the presence of intercell interference outside Serving cell and this non-service cell; N is noise.

Further, if hypothesis adopts multi-point joint to process the cooperative transmission technology of (JP), then can calculate the user capacity of each non-service cell when participating in cooperative transmission by following formula (2):

$C_{\mathrm{JP}-\mathrm{CoMP}}={\log }_2(1+\frac{{\mathrm{RSRP}}_S+{\mathrm{RSRP}}_C}{\mathrm{ICI}+N})---\left(2\right)$

Wherein, RSRP _SThe RSRP of Serving cell; RSRP _CThe RSRP of certain non-service cell; ICI is the presence of intercell interference outside Serving cell and this non-service cell; N is noise.

If suppose to adopt the cooperative transmission technology of cooperative scheduling/collaborative wave beam forming (CS/CB), then can calculate the user capacity of each non-service cell when participating in cooperative transmission by following formula (3):

$C_{\mathrm{CS}/\mathrm{CB}-\mathrm{CoMP}}={\log }_2(1+\frac{{\mathrm{RSRP}}_S}{\mathrm{ICI}+N})---\left(3\right)$

Wherein, RSRP _SThe RSRP of Serving cell; ICI is the presence of intercell interference outside Serving cell and this non-service cell; N is noise.

The user capacity of certain non-service cell when not participating in cooperative transmission can calculate by following formula (4):

$C_{\mathrm{non}-\mathrm{CoMP}}={\log }_2(1+\frac{{\mathrm{RSRP}}_S}{{\mathrm{RSRP}}_C+\mathrm{ICI}+N})---\left(4\right)$

Wherein, RSRP _SThe RSRP of Serving cell, RSRP _CThe RSRP of certain non-service cell; ICI is the presence of intercell interference outside Serving cell and this non-service cell; N is noise.

Step 1102:eNodeB judges that respectively the capacity gain of each non-service cell whether greater than the capacity gain thresholding that sets in advance (for example, 30%), if so, then puts into the collaborative feedback collection with corresponding non-service cell.

After executing above-mentioned flow process, can also further carry out above-mentioned steps 304, determine final collaborative feedback collection.

After having determined the collaborative feedback collection, eNodeB disposes the collaborative feedback collection of determining to UE, and behind the CSI of the collaborative feedback residential quarter that collection comprises that receives the UE feedback, the CSI that feeds back according to UE dispatches, precoding and signaling and transfer of data.

Corresponding said method, the present invention also provides the eNodeB that realizes said method, and as shown in figure 12, the internal main of this base station will comprise:

Reference signal quality parameter receiving element 401 is used for receiving the Serving cell of user terminal UE report and the reference signal quality parameter of each non-service cell;

Capacity gain determining unit 501 is used for calculating respectively the capacity gain that each non-service cell can obtain according to the Serving cell of UE report and the reference signal quality parameter of each non-service cell when participating in cooperative transmission; And

The second collaborative feedback collection determining unit 502, whether the capacity gain that is used for judging each non-service cell if so, then with corresponding non-service cell puts into collaborative feedback collection greater than the capacity gain thresholding that sets in advance.

As previously mentioned, above-mentioned reference signal quality parameter comprises RSRP or RSRQ.

Can find out from the system of selection of above-mentioned collaborative feedback collection and the internal structure of eNodeB, eNodeB pre-estimates the capacity gain that certain non-service cell can obtain when participating in cooperative transmission, and determine whether this non-service cell is added the collaborative feedback collection according to the size of capacity gain, can guarantee to only have capacity gain can add the collaborative feedback collection greater than the residential quarter of the capacity gain thresholding that sets in advance, therefore, can realize trading off preferably between cooperative transmission gain and the feedback overhead.And said method only need arrange a fixing capacity gain thresholding, and need not under the heterogeneous networks scene this capacity gain to be adjusted, and therefore, implements very simple.

Except such scheme, the present invention also provides another collaborative feedback collection system of selection, and its flow process mainly comprises as shown in figure 13:

The reference signal quality parameter of the Serving cell of step 301:eNodeB reception UE report and the reference signal quality parameter of non-service cell;

The difference of the reference signal quality parameter of step 1301:eNodeB difference calculation services residential quarter and the reference signal quality parameter of each non-service cell is respectively as reference signal quality parameter difference corresponding to each non-service cell;

Step 1302:eNodeB respectively reference signal quality parameter difference that each non-service cell is corresponding compares with the first thresholding (for example 3dB) that sets in advance, and respectively reference signal quality parameter and predefined second thresholding of each non-service cell compared, if reference signal quality parameter difference corresponding to certain non-service cell greater than the second thresholding that sets in advance, then put into the collaborative feedback collection with corresponding non-service cell less than the first thresholding or certain non-service cell reference signal quality parameter.

After executing above-mentioned flow process, can also further carry out above-mentioned steps 304, determine final collaborative feedback collection.

After having determined the collaborative feedback collection, eNodeB disposes the collaborative feedback collection of determining to UE, and behind the CSI of the collaborative feedback residential quarter that collection comprises that receives the UE feedback, the CSI that feeds back according to UE dispatches, precoding and signaling and transfer of data.

Further, in said method, can also adopt following method dynamically to adjust above-mentioned the second thresholding according to the cumulative distribution of the reference signal quality parameter of Serving cell, specifically comprise:

At first, under certain transmitted power and radius of society, statistics is the cumulative distribution function (CDF) of the reference signal quality parameter of Serving cell;

Then, a percentage set point is set, for example, 5%;

At last, according to the CDF of Serving cell reference signal quality parameter, the reference signal quality parameter value the when cumulative distribution that the second thresholding is set as Serving cell reference signal quality parameter equals this percentage set point.

Corresponding said method, the present invention also provides the eNodeB that realizes said method, and as shown in figure 14, the internal main of this base station will comprise:

Reference signal quality parameter receiving element 401 is for the reference signal quality parameter of the Serving cell that receives user terminal UE report and the reference signal quality parameter of non-service cell;

Reference signal quality parameter difference determining unit 601 is used for the difference of the reference signal quality parameter of the reference signal quality parameter of calculation services residential quarter respectively and each non-service cell, respectively as reference signal quality parameter difference corresponding to each non-service cell;

The 3rd collaborative feedback collection determining unit 602, being used for reference signal quality parameter difference corresponding to each non-service cell compares with the first thresholding that sets in advance, and respectively reference signal quality parameter and predefined second thresholding of each non-service cell compared, if reference signal quality parameter difference corresponding to certain non-service cell greater than the second thresholding that sets in advance, then put into the collaborative feedback collection with corresponding non-service cell less than the first thresholding or certain non-service cell reference signal quality parameter.

Above-mentioned eNodeB can further include: the second thresholding adjustment unit 603 is used for dynamically adjusting the second thresholding according to the cumulative distribution of Serving cell reference signal quality parameter.

As previously mentioned, above-mentioned reference signal quality parameter comprises RSRP or RSRQ.

Can find out from the system of selection of above-mentioned collaborative feedback collection and the internal structure of eNodeB, eNodeB is by arranging two fixing thresholdings, one side guarantees in the less situation of the difference of the reference signal quality parameter of Serving cell and certain non-service cell this non-service cell to be added the collaborative feedback collection, guarantee on the other hand also this non-service cell to be added the collaborative feedback collection when reference signal quality parameter of certain non-service cell self is larger, thereby can effectively increase the gain of cooperative transmission, realize between cooperative transmission gain and the feedback overhead compromise preferably.

The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (30)

1. collaborative feedback collection system of selection is characterized in that, comprising:

The reference signal quality parameter of the Serving cell of base station eNodeB reception user terminal UE report and the reference signal quality parameter of non-service cell;

ENodeB determines respectively the decision threshold that each non-service cell is corresponding according to the Serving cell of UE report or reference signal quality parameter and/or the Serving cell traffic carrying capacity of non-service cell with the ratio of the traffic carrying capacity of each non-service cell, wherein, described decision threshold is along with the growth of the reference signal quality parameter of Serving cell or non-service cell and/or described traffic carrying capacity ratio and increase;

The difference of the reference signal quality parameter of eNodeB difference calculation services residential quarter and the reference signal quality parameter of described each non-service cell, and with the difference that calculates respectively the decision threshold corresponding with described each non-service cell compare, if the difference that calculates less than decision threshold, is then put into the collaborative feedback collection with the non-service cell of correspondence.

2. method according to claim 1 further comprises:

ENodeB concentrates the residential quarter of front m the reference signal quality parameter maximum of selection to concentrate as final collaborative feedback from collaborative feedback residential quarter, wherein, m is the maximum number that the collaborative feedback collection can comprise the residential quarter.

3. method according to claim 1, wherein, described eNodeB determines with the ratio of the traffic carrying capacity of each non-service cell that respectively decision threshold corresponding to described each non-service cell comprises according to the Serving cell of UE report or reference signal quality parameter and/or the Serving cell traffic carrying capacity of non-service cell: eNodeB determines a decision threshold according to the reference signal quality parameter of the Serving cell of UE report, and with described decision threshold as decision threshold corresponding to each non-service cell, wherein, described decision threshold increases along with the growth of Serving cell reference signal quality parameter.

4. method according to claim 3, wherein, eNodeB determines that according to the reference signal quality parameter of the Serving cell of UE report a decision threshold comprises:

Set up the corresponding relation of reference signal quality parameter and decision threshold; And

Reference signal quality parameter and described corresponding relation according to the Serving cell of UE report are determined described decision threshold.

5. method according to claim 4, wherein, described corresponding relation is functional relation y=f (x), wherein, x represents the reference signal quality parameter of Serving cell, and y represents decision threshold, and when x1＞x2, guarantee y1-y2=f (x1)-f (x2)＞0.

6. method according to claim 1, wherein, described eNodeB determines with the ratio of the traffic carrying capacity of each non-service cell that respectively decision threshold corresponding to described each non-service cell comprises according to the Serving cell of UE report or reference signal quality parameter and/or the Serving cell traffic carrying capacity of each non-service cell: eNodeB determines respectively the decision threshold that described each non-service cell is corresponding according to the reference signal quality parameter of described each non-service cell, wherein, the decision threshold that described each non-service cell is corresponding increases along with the growth of the reference signal quality parameter of each non-service cell.

7. method according to claim 6, wherein, eNodeB determines respectively that according to the reference signal quality parameter of described each non-service cell decision threshold corresponding to described each non-service cell comprises:

Set up the corresponding relation of reference signal quality parameter and decision threshold; And

Reference signal quality parameter and described corresponding relation according to a certain non-service cell of UE report are determined the decision threshold that described non-service cell is corresponding.

8. method according to claim 7, wherein, described corresponding relation is functional relation y=f (x), wherein, x represents the reference signal quality parameter of a certain non-service cell, y represents decision threshold corresponding to this non-service cell, and when x1＞x2, guarantees y1-y2=f (x1)-f (x2)＞0.

9. method according to claim 1, wherein, described eNodeB determines with the ratio of the traffic carrying capacity of each non-service cell that respectively decision threshold corresponding to described each non-service cell comprises: the ratio of the traffic carrying capacity of eNodeB difference calculation services cell business volume and described each non-service cell according to the Serving cell of UE report or reference signal quality parameter and/or the Serving cell traffic carrying capacity of each non-service cell, and determine respectively decision threshold corresponding to described each non-service cell according to described traffic carrying capacity ratio, wherein, the decision threshold that described each non-service cell is corresponding increases along with the growth of traffic carrying capacity ratio.

10. method according to claim 9, wherein, determine respectively that according to described traffic carrying capacity ratio decision threshold corresponding to described each non-service cell comprises:

Set up the corresponding relation of traffic carrying capacity ratio and decision threshold; And

Determine the decision threshold that this non-service cell is corresponding according to the Serving cell traffic carrying capacity with ratio and the described corresponding relation of the traffic carrying capacity of a certain non-service cell.

11. method according to claim 10, wherein, described corresponding relation is functional relation y=f (x), wherein, x represents the ratio of traffic carrying capacity and a certain non-service cell traffic carrying capacity of Serving cell, y represents decision threshold corresponding to this non-service cell, and when x1＞x2, guarantees y1-y2=f (x1)-f (x2)＞0.

12. method according to claim 1, wherein, described eNodeB determines with the ratio of the traffic carrying capacity of each non-service cell that respectively decision threshold corresponding to described each non-service cell comprises: the ratio of the traffic carrying capacity of eNodeB difference calculation services cell business volume and described each non-service cell according to the Serving cell of UE report or reference signal quality parameter and/or the Serving cell traffic carrying capacity of each non-service cell, and determine respectively decision threshold corresponding to described each non-service cell according to the Serving cell of UE report or reference signal quality parameter and the described traffic carrying capacity ratio of each non-service cell, wherein, described decision threshold is along with the growth of the reference signal quality parameter of Serving cell or individual non-service cell and traffic carrying capacity ratio and increase.

13. method according to claim 12 wherein, determines respectively that according to the Serving cell of UE report or reference signal quality parameter and the described traffic carrying capacity ratio of each non-service cell decision threshold corresponding to described each non-service cell comprises:

Set up the corresponding relation of reference signal quality parameter, traffic carrying capacity ratio and decision threshold; And

Reference signal quality parameter, Serving cell traffic carrying capacity according to Serving cell or a certain non-service cell are determined the decision threshold that this non-service cell is corresponding with ratio and the described corresponding relation of the traffic carrying capacity of a certain non-service cell.

14. method according to claim 13, wherein, described corresponding relation is functional relation y=f (xa, xb), and wherein, xa represents the Serving cell of UE report or the reference signal quality parameter of certain non-service cell; Xb represents the traffic carrying capacity ratio of Serving cell and certain non-service cell; Y represents decision threshold corresponding to this non-service cell, and when xa1 〉=xa2 and xb1 〉=xb2, guarantees y1-y2=f (xa1, xb1)-f (xa2, xb2) 〉=0.

15. according to claim 4,7,10 or 13 described methods, wherein, described corresponding relation is recorded in the form.

16. according to claim 1 each or described method in 8 or 12 to 14, wherein, described reference signal quality parameter comprises: Reference Signal Received Power RSRP or Reference Signal Received Quality RSRQ.

17. a base station eNodeB is characterized in that, comprising:

Reference signal quality parameter receiving element (401) be used for to receive user's the reference signal quality parameter of Serving cell of UE report and the reference signal quality parameter of non-service cell;

Decision threshold determining unit (402), be used for determining respectively the decision threshold that described each non-service cell is corresponding according to the Serving cell of UE report or reference signal quality parameter and/or the service business amount of each non-service cell with the ratio of the traffic carrying capacity of each non-service cell, wherein, described decision threshold is along with the growth of the reference signal quality parameter of Serving cell or each non-service cell and/or traffic carrying capacity ratio and increase;

Collaborative feedback collection determining unit (403), the difference that is used for the reference signal quality parameter of the reference signal quality parameter of calculation services residential quarter respectively and described each non-service cell, and the decision threshold that the difference that calculates is corresponding with described each non-service cell compares, if the difference that calculates less than decision threshold, is then put into the collaborative feedback collection with corresponding non-service cell.

18. eNodeB according to claim 17 further comprises:

The big or small limiting unit (404) of collaborative feedback collection is used for from the concentrated concentrated residential quarter of the final collaborative feedback of residential quarter conduct of selecting front m reference signal quality parameter maximum of collaborative feedback, and wherein, m is the maximum number that the collaborative feedback collection can comprise the residential quarter.

19. eNodeB according to claim 17, wherein, decision threshold determining unit (402) comprising:

The first module (4021), be used for determining respectively decision threshold corresponding to each non-service cell according to the Serving cell of UE report or the reference signal quality parameter of each non-service cell, wherein, described decision threshold increases along with the growth of the reference signal quality parameter of Serving cell or each non-service cell.

20. eNodeB according to claim 17, wherein, decision threshold determining unit (402) comprising:

Traffic carrying capacity ratio calculation module (4022) is for the ratio of the traffic carrying capacity of distinguishing calculation services cell business volume and each non-service cell;

The second module (4023) is used for determining respectively decision threshold corresponding to described each non-service cell according to described traffic carrying capacity ratio that wherein, described decision threshold increases along with the growth of traffic carrying capacity ratio.

21. eNodeB according to claim 17, wherein, decision threshold determining unit (402) comprising:

Traffic carrying capacity ratio calculation module (4022) is for the ratio of the traffic carrying capacity of distinguishing calculation services cell business volume and each non-service cell;

The 3rd module (4024), be used for determining respectively decision threshold corresponding to described each non-service cell according to the Serving cell of UE report or reference signal quality parameter and the described traffic carrying capacity ratio of each non-service cell, wherein, described decision threshold is along with the growth of the reference signal quality parameter of Serving cell or each non-service cell and traffic carrying capacity ratio and increase.

22. collaborative feedback collection system of selection is characterized in that, comprising:

The reference signal quality parameter of the Serving cell of base station eNodeB reception user terminal UE report and the reference signal quality parameter of non-service cell;

ENodeB calculates respectively the capacity gain that each non-service cell can obtain according to the Serving cell of UE report and the reference signal quality parameter of non-service cell when participating in cooperative transmission; And

ENodeB judges that respectively the capacity gain of each residential quarter whether greater than the capacity gain thresholding that sets in advance, if so, then puts into the collaborative feedback collection with corresponding non-service cell.

23. method according to claim 22, wherein, eNodeB calculates respectively the capacity gain that each residential quarter can obtain according to the reference signal quality parameter of each residential quarter of UE report and comprises when participating in cooperative transmission:

ENodeB calculates respectively user capacity and the user capacity when not participating in cooperative transmission of each non-service cell when participating in cooperative transmission according to the reference signal quality parameter of each residential quarter of UE report;

ENodeB calculates respectively the difference of the user capacity of each non-service cell when participating in cooperative transmission and user capacity when not participating in cooperative transmission, and the difference of the user capacity that described each non-service cell is corresponding and the ratio of the user capacity of this non-service cell when not participating in cooperative transmission are as capacity gain corresponding to this non-service cell respectively.

24. method according to claim 23, wherein, the user capacity of described each non-service cell when participating in cooperative transmission passes through formula

Calculate;

The user capacity of described each non-service cell when not participating in cooperative transmission passes through formula $C_{\mathrm{non}-\mathrm{CoMP}}={\log }_2(1+\frac{{\mathrm{RSRP}}_S}{{\mathrm{RSRP}}_C+\mathrm{ICI}+N})$ Calculate;

Wherein, RSRP _SThe Reference Signal Received Power RSRP of Serving cell, RSRP _CThe RSRP of certain non-service cell; ICI is the presence of intercell interference outside Serving cell and this non-service cell; N is noise.

25. method according to claim 23, wherein, if the cooperative transmission technology that hypothesis adopts multi-point joint to process, the user capacity of described each non-service cell when participating in cooperative transmission passes through formula $C_{\mathrm{JP}-\mathrm{CoMP}}={\log }_2(1+\frac{{\mathrm{RSRP}}_S+{\mathrm{RSRP}}_C}{\mathrm{ICI}+N})$ Calculate;

If suppose to adopt the cooperative transmission technology of cooperative scheduling/collaborative wave beam forming, the user capacity of described each non-service cell when participating in cooperative transmission passes through formula

Calculate;

The user capacity of described each non-service cell when not participating in cooperative transmission passes through formula $C_{\mathrm{non}-\mathrm{CoMP}}={\log }_2(1+\frac{{\mathrm{RSRP}}_S}{{\mathrm{RSRP}}_C+\mathrm{ICI}+N})$ Calculate;

Wherein, RSRP _SThe RSRP of Serving cell, RSRP _CThe RSRP of certain non-service cell; ICI is the presence of intercell interference outside Serving cell and this non-service cell; N is noise.

26. a base station eNodeB is characterized in that, comprising:

Reference signal quality parameter receiving element (401) is for the reference signal quality parameter of the Serving cell that receives user terminal UE report and the reference signal quality parameter of non-service cell;

Capacity gain determining unit (501) is used for calculating respectively the capacity gain that each non-service cell can obtain according to the Serving cell of UE report and the reference signal quality parameter of non-service cell when participating in cooperative transmission; And

The second collaborative feedback collection determining unit (502), whether the capacity gain that is used for judging each non-service cell if so, then with corresponding non-service cell puts into collaborative feedback collection greater than the capacity gain thresholding that sets in advance.

27. collaborative feedback collection system of selection is characterized in that, comprising:

The reference signal quality parameter of the Serving cell of base station eNodeB reception user terminal UE report and the reference signal quality parameter of non-service cell;

The difference of the reference signal quality parameter of eNodeB difference calculation services residential quarter and the reference signal quality parameter of each non-service cell is respectively as reference signal quality parameter difference corresponding to each non-service cell; And

ENodeB respectively reference signal quality parameter difference that each non-service cell is corresponding compares with the first thresholding that sets in advance, and respectively reference signal quality parameter and predefined second thresholding of each non-service cell compared, if reference signal quality parameter difference corresponding to certain non-service cell greater than the second thresholding that sets in advance, then put into the collaborative feedback collection with corresponding non-service cell less than the first thresholding or certain non-service cell reference signal quality parameter.

28. method according to claim 27 wherein, further comprises:

The cumulative distribution function CDF of statistics Serving cell reference signal quality parameter;

A percentage set point is set; And

According to the CDF of Serving cell reference signal quality parameter, the reference signal quality parameter value the when cumulative distribution that the second thresholding is set as the reference signal quality parameter of Serving cell equals described percentage set point.

29. a base station eNodeB is characterized in that, comprising:

Reference signal quality parameter receiving element (401) is for the reference signal quality parameter of the Serving cell that receives user terminal UE report and the reference signal quality parameter of non-service cell;

Reference signal quality parameter difference determining unit (601), the difference that is used for the reference signal quality parameter of the reference signal quality parameter of calculation services residential quarter respectively and each non-service cell is respectively as reference signal quality parameter difference corresponding to each non-service cell;

The 3rd collaborative feedback collection determining unit (602), being used for reference signal quality parameter difference corresponding to each non-service cell compares with the first thresholding that sets in advance, and respectively reference signal quality parameter and predefined second thresholding of each non-service cell compared, if reference signal quality parameter difference corresponding to certain non-service cell greater than the second thresholding that sets in advance, then put into the collaborative feedback collection with corresponding non-service cell less than the first thresholding or certain non-service cell reference signal quality parameter.

30. base station according to claim 29 further comprises:

The second thresholding adjustment unit (603) is used for dynamically adjusting described the second thresholding according to the cumulative distribution of Serving cell reference signal quality parameter.

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