CN102761912A - Method and system for selecting coordination district from CoMP - Google Patents

Abstract

The invention discloses a method for selecting a coordination district from coordinated multiple point (CoMP) transmission. The method comprises the steps as follows: after a service district receives the response of each candidate coordination district, a target coordination district is determined from all the candidate coordination districts sending the agreement of coordination responses according to the maximum strategy of the throughput of a CoMP system or the requirement strategy of data rates. The invention further discloses a system for selecting a coordination district from CoMP. The method and the system provided by the invention can effectively select a better coordination district, thereby improving the throughput of the CoMP system and further utilizing the superiority of the CoMP technology more efficiently.

Description

Select the method and system of cooperation cell in a kind of multipoint cooperative transmission

Technical field

The present invention relates to multipoint cooperative transmission (CoMP, Coordinated Multi-Point transmission/reception) technology, be meant the method and system of selecting cooperation cell among a kind of CoMP especially.

Background technology

Cell Edge User equipment (UE, User Equipment) the abominable main cause of channel conditions is because the strong interference that neighbor cell produces, and this interference can cause a series of problems such as the throughput decline, error rate rising of system.In traditional interference cancellation algorithm, independently operate the base station, though adopted technology such as randomize interference, soft-frequency reuse, still can not eliminate presence of intercell interference effectively, improves the performance of edge UE.Therefore, the CoMP technology is arisen at the historic moment, and this technology is mutual and coordination through the multidate information between the access point (AP, Access Point), thereby can reduce the phase mutual interference of different edge UE transmission between the AP to greatest extent.

At present; In existing C oMP system, when edge UE can't satisfy communicating requirement because of receiving than strong jamming, Serving cell will send the coordinated scheduling request to neighbor cell; After neighbor cell is received the coordinated scheduling request; According to the interactive information between self and the Serving cell, make with making policy decision: accept request, the associating Serving cell carries out joint transmission on this frequency band; Perhaps, do not accept request, keep original scheduling result, Serving cell carries out joint transmission with neighbor cell after receiving the decision-making that accepts request of neighbor cell transmission; Here, when practical application, two kinds of cooperation transmission patterns can be arranged, comprise: single user (SU, Single User)-CoMP collaboration mode and multi-user (Multiple User)-CoMP collaboration mode; Wherein,, when coordinated scheduling, need to sacrifice the neighbor cell its other resources, exchange the performance boost of Serving cell for for the SU-COMP collaboration mode; And for the MU-CoMP collaboration mode, then need seek a suitable pairing UE by cooperation cell and cooperate and accomplish the process of complicated MU-joint transmission (JT, Joint Transmission).But, no matter take which kind of collaboration mode, choosing of cooperation cell all is vital, it directly has influence on the result of coordinated scheduling.

Yet, in the prior art, as long as after Serving cell is received the decision-making that accepts request of neighbor cell transmission; The just direct neighbor cell that transmission is accepted request is as cooperation cell; So, the waste of frequency spectrum resource can be caused, thereby the throughput of CoMP system can not be improved effectively; In addition, possibly also can cause and to suppress effectively to disturb.In addition; Neighbor cell is when making decisions; Do not consider the coordinated scheduling request that the residing cooperation of neighbor cell concentrates other neighbor cell except that the service sub-district to send, so, the result that can cause the waste of frequency spectrum resource equally and can not suppress effectively to disturb.

Summary of the invention

In view of this, main purpose of the present invention is to provide the method and system of selecting cooperation cell among a kind of CoMP, can improve the throughput of CoMP system effectively.

For achieving the above object, technical scheme of the present invention is achieved in that

The invention provides the method for selecting cooperation cell among a kind of CoMP, this method comprises:

After Serving cell is received the response of each candidate's cooperation cell, require strategy, send from all and confirm the target cooperation cell candidate's cooperation cell of agreeing coordinate responses according to maximum strategy of CoMP throughput of system or data rate.

In the such scheme, said according to the maximum strategy of CoMP throughput of system, send definite target cooperation cell candidate's cooperation cell of agreeing coordinate responses from all, for:

Send candidate's cooperation cell of agreeing coordinate responses from all that receive, candidate's cooperation cell of total rate gain value maximum that the CoMP system can promote after the selection cooperation transmission is as the target cooperation cell; Wherein,

Send candidate's cooperation cell of agreeing coordinate responses for each, total rate gain value that the CoMP system can promote is: Δ C " _i=Δ C+ Δ C '; Wherein, after Δ C representes cooperation transmission, the rate gain value that the UE of Serving cell can promote, after the Δ C ' expression cooperation transmission, the throughput that candidate's cooperation cell self reduces.

In the such scheme, said according to data rate requirement strategy, send definite target cooperation cell candidate's cooperation cell of agreeing coordinate responses from all, for:

Send candidate's cooperation cell of agreeing coordinate responses from all, select to satisfy formula: candidate's cooperation cell of

is as the target cooperation cell;

Wherein, R represents transmission rate requirements; L represents the return agreed to coordinate the response of the candidate cooperative cell collection;

indicates cooperative cell collection; said

include: serving cell and all return agreed to coordinate the response of a candidate more than cooperative cell in the cell; indicates cooperative cell collection

The total throughput; said that due to collaboration, the candidate set L coordinated cell throughput decreased values.

In the such scheme, this method further comprises:

After each candidate's cooperation cell is received the coordinated scheduling request; And behind timer expiry; According to the strategy that can improve the total throughput of CoMP system after the cooperation transmission; From the corresponding Serving cell of all coordinated scheduling requests that is directed against same Resource Block (RB, Resource Block) of receiving, confirm to carry out the Serving cell of cooperation transmission;

Candidate's cooperation cell is returned the agreement coordinate responses to the Serving cell of confirming that carries out cooperation transmission, and sends requested service sub-district to other and return and disagree with coordinate responses.

In the such scheme; After said each candidate's cooperation cell is received the coordinated scheduling request; And behind timer expiry; According to the strategy that can improve the total throughput of CoMP system after the cooperation transmission, from the corresponding Serving cell of all coordinated scheduling requests that is directed against same RB of receiving, confirm to carry out the Serving cell of cooperation transmission, for:

Candidate's cooperation cell is confirmed the rate gain value of the CoMP system that can bring that each said transmission coordinated scheduling requested service sub-district is corresponding according to the loading condition of self;

The rate gain value maximum service sub-district of the CoMP system that selection can bring is as the Serving cell that carries out cooperation transmission.

In the such scheme; The said rate gain value of confirming the CoMP system that can bring that each said transmission coordinated scheduling requested service sub-district is corresponding; The Serving cell of cooperation transmission is carried out in the rate gain value maximum service sub-district conduct of the CoMP system that selection can bring, for:

If candidate's cooperation cell self scheduling result is constant; Do not accept request the rate gain value that then can bring

to the CoMP system

If give up the frequency band of self, accept request, then for each Serving cell, the rate gain value that can bring the CoMP system

Selection can bring the Δ C of maximum rate yield value ^{P, n}As the rate gain value that can bring the CoMP system

If the transposing frequency band accepts request, adopt idle RB _kThe time, for each Serving cell, the rate gain value that can bring the CoMP system Select to bring the Δ C of maximum rate gain afterwards ^{P, k}As the rate gain value that can bring the CoMP system

According to formula:

confirms to carry out the Serving cell of cooperation transmission;

Wherein,

The UE m of expression candidate cooperation cell ⁰RB in candidate's cooperation cell _pOn transmission rate;

The UEm of expression Serving cell n ⁿUse the RB of candidate's cooperation cell _pThe time the transmission rate added value; Expression UE m ⁰Idle RB in candidate's cooperation cell _kOn transmission rate.

In the such scheme, this method further comprises:

After receiving the coordinated scheduling request that UE sends, and the rate gain value Δ C that can promote as said UE after the cooperation transmission is during greater than the threshold value preset, Serving cell on the employed RB of said UE to all candidate's cooperation cell transmission coordinated scheduling requests.

The present invention also provides the system of selecting cooperation cell among a kind of CoMP; This system comprises at least: Serving cell; After being used to receive the response of each candidate's cooperation cell; Require strategy according to maximum strategy of CoMP throughput of system or data rate, send from all and confirm the target cooperation cell candidate's cooperation cell of agreeing coordinate responses.

In the such scheme; This system further comprises: candidate's cooperation cell; After being used to receive the coordinated scheduling request of Serving cell transmission; And behind timer expiry,, from the corresponding Serving cell of all coordinated scheduling requests that is directed against same RB of receiving, confirm to carry out the Serving cell of cooperation transmission according to the strategy that can improve the total throughput of CoMP system after the cooperation transmission; And return the agreement coordinate responses to the Serving cell of confirming that carries out cooperation transmission, send requested service sub-district to other and return and disagree with coordinate responses.

In the such scheme; Said Serving cell; After also being used to receive the coordinated scheduling request that UE sends, and the rate gain value Δ C that can promote as said UE after the cooperation transmission is during greater than the threshold value preset, on the employed RB of said UE to all candidate's cooperation cell transmission coordinated scheduling requests.

In the such scheme, the number of sending the said Serving cell of coordinated scheduling request to same RB is more than one.

In the such scheme, the number of said candidate's cooperation cell is more than one.

Select the method and system of cooperation cell among the CoMP provided by the invention; After Serving cell is received the response of each candidate's cooperation cell, require strategy, send from all and confirm the target cooperation cell candidate's cooperation cell of agreeing coordinate responses according to maximum strategy of CoMP throughput of system or data rate; So; Can select preferable cooperation cell effectively, thereby improve the throughput of CoMP system, further utilize the advantage of CoMP technology more efficiently.

In addition; After each candidate's cooperation cell is received the coordinated scheduling request, and behind timer expiry, according to the strategy that can improve the total throughput of CoMP system after the cooperation transmission; From the corresponding Serving cell of all coordinated scheduling requests that is directed against same RB of receiving, confirm to carry out the Serving cell of cooperation transmission; So, can more effectively select preferable cooperation cell after, thereby further improve the throughput of CoMP system.

Description of drawings

Fig. 1 is for selecting the method flow sketch map of cooperation cell among the CoMP of the present invention;

Fig. 2 realizes selecting among the CoMP method flow sketch map of cooperation cell for embodiment.

Embodiment

Basic thought of the present invention is: after Serving cell is received the response of each candidate's cooperation cell; Require strategy according to maximum strategy of CoMP throughput of system or data rate, send from all and confirm the target cooperation cell candidate's cooperation cell of agreeing coordinate responses.

Below in conjunction with accompanying drawing and specific embodiment the present invention is remake further detailed explanation.

Select the method for cooperation cell among the CoMP of the present invention, as shown in Figure 1, may further comprise the steps:

Step 101: after each candidate's cooperation cell is received the coordinated scheduling request; And behind timer expiry; According to the strategy that can improve the total throughput of CoMP system after coordinating, from the corresponding Serving cell of all coordinated scheduling requests that is directed against same RB of receiving, confirm to carry out the Serving cell of cooperation transmission;

Particularly, candidate's cooperation cell is confirmed the rate gain value of the CoMP system that can bring that each said transmission coordinated scheduling requested service sub-district is corresponding according to the loading condition of self;

The rate gain value maximum service sub-district of the CoMP system that selection afterwards can bring is as the Serving cell that carries out cooperation transmission.

Before this step, this method can further include:

After receiving the coordinated scheduling request that UE sends, and the rate gain value Δ C that can promote as said UE after the cooperation transmission is during greater than the threshold value preset, Serving cell on the employed RB of said UE to all candidate's cooperation cell transmission coordinated scheduling requests; Wherein, said coordinated scheduling request of sending to all candidate's cooperation cell comprises: when adopting each candidate's cooperation cell that said UE is carried out cooperation transmission, and the rate gain value Δ C that said UE can promote.

Step 102: candidate's cooperation cell is returned the agreement coordinate responses to the Serving cell of confirming that carries out cooperation transmission, and sends requested service sub-district to other and return and disagree with coordinate responses;

Here, said agreement coordinate responses comprises: after the cooperation transmission, the throughput Δ C ' that candidate's cooperation cell self reduces wherein, can adopt prior art to obtain the throughput Δ C ' that candidate's cooperation cell self reduces.

Step 103: after Serving cell is received the response of each candidate's cooperation cell, require strategy, send from all and confirm the target cooperation cell candidate's cooperation cell of agreeing coordinate responses according to maximum strategy of CoMP throughput of system or data rate.

Here, said according to the maximum strategy of CoMP throughput of system, send definite target cooperation cell candidate's cooperation cell of agreeing coordinate responses from all, be specially:

Send candidate's cooperation cell of agreeing coordinate responses from all that receive, candidate's cooperation cell of total rate gain value maximum that the CoMP system can promote after the selection cooperation transmission is as the target cooperation cell.

Said according to the data rate strategy, from all candidate's cooperation cell, confirm the target cooperation cell, be specially:

Formula is satisfied in selection:

Collaboration candidate target cell cooperative cell, wherein, R represents transmission rate requirement; L represents the return agreed to coordinate the response of the candidate set of the cooperative cell;

indicates cooperative cell collection; said include: serving cell and all agreed to coordinate the response to return a candidate cooperative cell in more than one district;

means cooperative cell collection

The total throughput;

said that due to collaboration, the candidate set L coordinated cell throughput decreased values.

Below in conjunction with embodiment the present invention is described in further detail again.

In the CoMP system of a plurality of sub-districts was arranged, the signal of the downlink data that Serving cell sends was exactly an interference signal for the same frequency UE of neighbor cell; Especially for the edge UE of neighbor cell, this interference signal maybe be quite strong, can cause Signal to Interference plus Noise Ratio (SINR; Signal to Interference plus Noise Ratio) very low, therefore, in this case; The edge UE of neighbor cell can only the less code modulation mode of supporting rate, thereby can cause service throughput low.Here, the said UE that is meant the identical RB of use with frequency UE.

Select the method for cooperation cell among the present embodiment CoMP, as shown in Figure 2, may further comprise the steps:

Step 201: after Serving cell is received the coordinated scheduling request of UE transmission, on the employed RB of said UE, send the coordinated scheduling request to all candidate's cooperation cell;

Here, Serving cell sends to all candidate's cooperation cell through X2 interface with the coordinated scheduling request.

Before this step, Serving cell according to actual state and the demand of the UE that self had, is divided into the UE (UE-Co) that needs cooperation transmission with UE and reaches the UE (UE-NCo) that does not need cooperation transmission, and is that each UE distributes RB.

Wherein, Serving cell can be divided into UE-CO and UE-NCO with UE according to the channel quality of UE in the time of a frame; Here, said channel quality specifically can be: UE uplink feedback channel quality or up reception estimated channel quality;

Said Serving cell can be divided into UE-CO and UE-NCO with UE according to the channel quality of UE in the time of a frame, is specially:

Judge that whether the interior average SINR of UE one frame time is greater than threshold value (SINR _Gate), if greater than, think that then the channel conditions of this UE is relatively worse, this UE is divided into UE-Co, if less than, think that then the channel conditions of this UE is good, this UE is divided into UE-NCo;

Wherein, said SINR _GateCan confirm according to dynamic variation of real network loading condition, distribute so that obtain optimum UE crowd.

When distributing RB for UE, Serving cell proportionally fair algorithm is that UE distributes RB, does not consider the cooperation factor.

Here, Serving cell is divided into UE-Co and UE-NCo according to actual state and the demand of the UE that self had with UE, and distributes concrete processing procedure and the prior art of RB identical for each UE.

The coordinated scheduling request that said UE sends is: to the coordinated scheduling request that self employed RB sent.

Serving cell can be confirmed candidate's cooperation cell according to the employed RB of UE, and concrete processing procedure is a prior art.

The number of candidate's cooperation cell can be for more than one.

Said coordinated scheduling request of sending to all candidate's cooperation cell comprises: when adopting each candidate's cooperation cell that said UE is carried out cooperation transmission, and the rate gain value Δ C that said UE can promote; The rate gain value Δ C that said UE can promote is: the difference of the transmission rate before transmission rate after said UE cooperates and the cooperation.

Serving cell on the employed RB of said UE to the opportunity that all candidate's cooperation cell are sent the coordinated scheduling requests is being: the rate gain value Δ C that said UE can promote greater than the threshold value of presetting after; Wherein, when threshold value is set, require to be provided with according to real system.

Step 202: after each candidate's cooperation cell is received the coordinated scheduling request; And behind timer expiry; According to the strategy that can improve the total throughput of CoMP system after the cooperation transmission, from the corresponding Serving cell of all coordinated scheduling requests that is directed against same RB of receiving, confirm to carry out the Serving cell of cooperation transmission;

Here, length of timer can be provided with according to needs, such as: a frame.

Said according to the strategy that can improve the total throughput of CoMP system after the cooperation transmission, from receive to the Serving cell of confirming to carry out cooperation transmission the corresponding Serving cell of the coordinated scheduling request of same RB, be specially:

Candidate's cooperation cell is confirmed the rate gain value of the CoMP system that can bring that each said transmission coordinated scheduling requested service sub-district is corresponding according to the loading condition of self;

The rate gain value maximum service sub-district of the CoMP system that selection can bring is as the Serving cell that carries out cooperation transmission;

When practical application, said process specifically comprises:

Self scheduling result is constant; Do not accept request; At this moment, the rate gain value that can bring the CoMP system

Give up the frequency band of self, accept request, at this moment, for each Serving cell, the rate gain value that can bring the CoMP system

Select to bring the Δ C of maximum rate yield value afterwards ^{P, n}As the rate gain value that can bring the CoMP system

The transposing frequency band accepts request, and at this moment, adopts idle RB _kThe time, for each Serving cell, the rate gain value that can bring the CoMP system Select to bring the Δ C of maximum rate gain afterwards ^{P, k}As the rate gain value that can bring the CoMP system

Wherein,

UE m for candidate's cooperation cell ⁰RB in candidate's cooperation cell _pOn transmission rate; Be UE m from Serving cell n ⁿUse the RB of candidate's cooperation cell _pThe time the transmission rate added value, that is: the said UE rate gain value Δ C that can promote;

Expression UE m ⁰Idle RB in candidate's cooperation cell _kOn transmission rate; Here, candidate's cooperation cell can obtain through prior art

RB when candidate's cooperation cell _pWhen going up not with frequency UE, then order $R_{m^{0}p}=0,$ $R_{m^{0}k}=0.$

The Serving cell of cooperation transmission is carried out in the rate gain value maximum service sub-district conduct of the CoMP system that said selection can bring, available following equation expression:

$j^p=\underset{j=\mathrm{1,2,3}}{\arg \max }\mathrm{\Δ}{C}_j^p$

Wherein, if select the transposing frequency band, certain Serving cell in the decision-making that accepts request is as the Serving cell that carries out cooperation transmission, and its concrete implementation procedure can be used following equation expression:

$\{n^{*},k^{*}\}=\underset{n,k}{\arg \max }\left\{\mathrm{\Δ}{C}_3^{p,k}\right\}$ (1)

$\mathrm{\Δ}{C}_3^p=\underset{n,k}{\max }\mathrm{\Δ}{C}_3^{p,k}$

Wherein, n ^*The Δ C of the maximum rate yield value that can bring the CoMP system that expression is selected ^{P, k}Corresponding Serving cell; k ^*The Δ C of the maximum rate yield value that can bring the CoMP system that expression is selected ^{P, k}Corresponding idle RB.

When practical application,, therefore, can occur because the transmittability on each RB is different

Situation, at this moment, claim UE m ⁰Be in " loss " state,

Expression " defective value ".In this case; If vacant frequency band is still arranged in candidate's cooperation cell; Then make

regard the remaining data rate requirement as an internal request; Coordinated scheduling request with other Serving cell is dispatched; If candidate's cooperation cell does not have vacant frequency band, then do not carry out any processing.

Under special circumstances;

arranged if in all residue RB set

, satisfy this moment when underload

At this moment, claim the load capacity " false not enough " of candidate's cooperation cell, in this case, still make the transposing frequency band, the decision-making that accepts request, and according to formula (1) selection Serving cell.

The purpose of execution in step 202 is: the coordinated scheduling request to Serving cell is selected, and arranges the RB of Combined Treatment as far as possible for improving the maximum coordinated scheduling request of CoMP throughput of system; For self UE that abandons RB, seek idling-resource and compensate.

Step 203: candidate's cooperation cell is returned the agreement coordinate responses to the Serving cell of confirming that carries out cooperation transmission, and sends requested service sub-district to other and return and disagree with coordinate responses;

Here, said agreement coordinate responses comprises: after the cooperation transmission, the throughput Δ C ' that candidate's cooperation cell self reduces wherein, can adopt prior art to obtain the throughput Δ C ' that candidate's cooperation cell self reduces.

Step 204: after Serving cell is received the response of each candidate's cooperation cell, require strategy, send from all and confirm the target cooperation cell candidate's cooperation cell of agreeing coordinate responses according to maximum strategy of CoMP throughput of system or data rate;

Here, said according to the maximum strategy of CoMP throughput of system, send definite target cooperation cell candidate's cooperation cell of agreeing coordinate responses from all, be specially:

Send candidate's cooperation cell of agreeing coordinate responses from all that receive, candidate's cooperation cell of total rate gain value maximum that the CoMP system can promote after the selection cooperation transmission is as the target cooperation cell.

Wherein, use equation expression, be specially:

After the cooperation transmission, total rate gain value Δ C that each candidate's cooperation cell can promote the CoMP system " _i=Δ C+ Δ C '; According to formula: i=arg max{ Δ C " _iThe select target cooperation cell.

When practical application, as long as the CoMP network is not the situation of full-buffer, each UE can have corresponding rate requirement; Wherein, said full-buffer is meant that each UE has unlimited data volume to send, therefore; In the target cooperation cell is selected; Should select to satisfy rate requirement, the wasting of resources is minimum and neighbor cell is influenced minimum sub-district, therefore, said strategy according to data rate; Send definite target cooperation cell candidate's cooperation cell of agreeing coordinate responses from all, be specially:

Wherein, R represents transmission rate requirements; L represents the return agreed to coordinate the response of the candidate cooperative cell collection;

indicates cooperative cell collection; said

include: serving cell and all return agreed to coordinate the response of the candidate in a more coordinated cell cell;

represents collaboration set of cells

The total throughput;

said that due to collaboration, the candidate set L coordinated cell throughput decreased value; wherein the prior art can be used to get

and

to

is calculated, you can return to the serving cell, respectively, agreed to coordinate the response to each candidate the throughput of cooperative cell as

or the serving cell, respectively, agreed to coordinate with all of the returned candidate cooperative cell response in the two cell throughput of as

And so on, until the conditions are met the objectives cooperative cells, give example, suppose return agreed to coordinate the response of candidate cooperative cell comprises: a second candidate cooperative cell AP2, third candidate cooperative cells AP3, and the fifth candidate cooperative cell AP5, in calculating

, the serving cell, respectively, and AP2, AP3, AP5 throughput, respectively, as the sum of three

serving cell and AP2, AP3 throughput of as a

serving cell and AP2, AP5 throughput of as a

serving cell and AP3, AP5 throughput of as a

Service Community and AP2, AP3, and AP5 throughput of as a

until the conditions are met the objectives cooperative cell.The corresponding throughput drop-out value of selected candidate's cooperation cell when accordingly, is for calculating .

Here, β ∈ [0,1], when β=1, the result of formula (3) representes to select to satisfy the minimum neighbor cell of rate requirement, waste as cooperation cell, and does not consider the influence to the neighbor cell throughput.When β=0; Under the condition that the result of formula (3) is illustrated in satisfied

, selecting as far as possible influences little neighbor cell as cooperation cell to neighbor cell.Here, the β value can dynamically change according to the real system needs.

Here, in the selection of target cooperation cell, if satisfy simultaneously rate requirement, the wasting of resources minimum, to minimum three conditions of the influence of neighbor cell, then the select target cooperation cell need satisfy following formula simultaneously:

$\min {\stackrel{\‾}{C}}_L---\left(5\right)$

Obviously, formula (4) and formula (5) can not satisfy simultaneously, therefore, need to introduce factor-beta.

The purpose that step 204 is carried out is: to being ready that candidate's cooperation cell of assisting self to carry out cooperation transmission selects; According to the requirement of maximize system throughput or the consideration of fairness; Select best target cooperation cell, thereby utilize the technical advantage of cooperation transmission efficiently.

When practical application, Serving cell can not determined any target cooperation cell according to above-mentioned strategy, can also be more than one according to the number of the determined target cooperation cell of above-mentioned strategy.

Step 205: Serving cell and target cooperation cell are sent data jointly according to the physical transfer mode of arranging in advance.

Here, Serving cell is identical with concrete processing procedure and prior art that the target cooperation cell is sent data jointly according to the physical transfer mode of arranging in advance, repeats no more here.

For realizing said method; The present invention also provides the system of selecting cooperation cell among a kind of CoMP; This system comprises at least: Serving cell; After being used to receive the response of each candidate's cooperation cell, require strategy, send from all and confirm the target cooperation cell candidate's cooperation cell of agreeing coordinate responses according to maximum strategy of CoMP throughput of system or data rate.

This system can further include candidate's cooperation cell; After being used to receive the coordinated scheduling request of Serving cell transmission; And behind timer expiry; According to the strategy that can improve the total throughput of CoMP system after the cooperation transmission; All from what receive, and return the agreement coordinate responses to the Serving cell of confirming that carries out cooperation transmission to the Serving cell of confirming to carry out cooperation transmission the corresponding Serving cell of the coordinated scheduling request of same RB, and send requested service sub-district to other and return and disagree with coordinate responses;

Said Serving cell; After also being used to receive the coordinated scheduling request of UE transmission; And the rate gain value Δ C that can promote as said UE after the cooperation transmission sends the coordinated scheduling request to all candidate's cooperation cell during greater than preset threshold value on the employed RB of said UE.

Here, need to prove: the number of sending the said Serving cell of coordinated scheduling request to same RB is more than one, and the number of said candidate's cooperation cell is more than one.

Here, the concrete processing procedure of the Serving cell in the system according to the invention and candidate's cooperation cell details hereinbefore, repeats no more.

The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.

Claims (12)

1. select the method for cooperation cell in the multipoint cooperative transmission (CoMP), it is characterized in that this method comprises:

After Serving cell is received the response of each candidate's cooperation cell, require strategy, send from all and confirm the target cooperation cell candidate's cooperation cell of agreeing coordinate responses according to maximum strategy of CoMP throughput of system or data rate.

2. method according to claim 1 is characterized in that, and is said according to the maximum strategy of CoMP throughput of system, send from all and confirm the target cooperation cell candidate's cooperation cell of agreeing coordinate responses, for:

Send candidate's cooperation cell of agreeing coordinate responses from all that receive, candidate's cooperation cell of total rate gain value maximum that the CoMP system can promote after the selection cooperation transmission is as the target cooperation cell; Wherein,

Send candidate's cooperation cell of agreeing coordinate responses for each, total rate gain value that the CoMP system can promote is: Δ C " _i=Δ C+ Δ C '; Wherein, after Δ C representes cooperation transmission, the rate gain value that the subscriber equipment of Serving cell (UE) can promote, after the Δ C ' expression cooperation transmission, the throughput that candidate's cooperation cell self reduces.

3. method according to claim 1 is characterized in that, and is said according to data rate requirement strategy, send from all and confirm the target cooperation cell candidate's cooperation cell of agreeing coordinate responses, for:

Send candidate's cooperation cell of agreeing coordinate responses from all, select to satisfy formula: candidate's cooperation cell of is as the target cooperation cell;

Wherein, R represents transmission rate requirements; L represents the return agreed to coordinate the response of the candidate cooperative cell collection;

indicates cooperative cell collection; said

include: serving cell and all agreed to coordinate the response to return a candidate Collaboration more than one cell, the cell; indicates cooperative cell collection

The total throughput;

said that due to collaboration, the candidate set L coordinated cell throughput decreased values.

4. according to claim 1,2 or 3 described methods, it is characterized in that this method further comprises:

After each candidate's cooperation cell is received the coordinated scheduling request; And behind timer expiry; According to the strategy that can improve the total throughput of CoMP system after the cooperation transmission, from the corresponding Serving cell of all coordinated scheduling requests that is directed against same Resource Block (RB) of receiving, confirm to carry out the Serving cell of cooperation transmission;

Candidate's cooperation cell is returned the agreement coordinate responses to the Serving cell of confirming that carries out cooperation transmission, and sends requested service sub-district to other and return and disagree with coordinate responses.

5. method according to claim 4; It is characterized in that; After said each candidate's cooperation cell is received the coordinated scheduling request, and behind timer expiry, according to the strategy that can improve the total throughput of CoMP system after the cooperation transmission; From the corresponding Serving cell of all coordinated scheduling requests that is directed against same RB of receiving, confirm to carry out the Serving cell of cooperation transmission, for:

Candidate's cooperation cell is confirmed the rate gain value of the CoMP system that can bring that each said transmission coordinated scheduling requested service sub-district is corresponding according to the loading condition of self;

The rate gain value maximum service sub-district of the CoMP system that selection can bring is as the Serving cell that carries out cooperation transmission.

6. method according to claim 5; It is characterized in that; The said rate gain value of confirming the CoMP system that can bring that each said transmission coordinated scheduling requested service sub-district is corresponding; The Serving cell of cooperation transmission is carried out in the rate gain value maximum service sub-district conduct of the CoMP system that selection can bring, for:

If candidate's cooperation cell self scheduling result is constant; Do not accept request the rate gain value that then can bring

to the CoMP system

If give up the frequency band of self, accept request, then for each Serving cell, the rate gain value that can bring the CoMP system Selection can bring the Δ C of maximum rate yield value ^{P, n}As the rate gain value that can bring the CoMP system

If the transposing frequency band accepts request, adopt idle RB _kThe time, for each Serving cell, the rate gain value that can bring the CoMP system

Select to bring the Δ C of maximum rate gain afterwards ^{P, k}As the rate gain value that can bring the CoMP system

According to formula:

confirms to carry out the Serving cell of cooperation transmission;

Wherein,

The UE m of expression candidate cooperation cell ⁰RB in candidate's cooperation cell _pOn transmission rate;

The UE m of expression Serving cell n ⁿUse the RB of candidate's cooperation cell _pThe time the transmission rate added value; Expression UE m ⁰Idle RB in candidate's cooperation cell _kOn transmission rate.

7. method according to claim 4 is characterized in that, this method further comprises:

After receiving the coordinated scheduling request that UE sends, and the rate gain value Δ C that can promote as said UE after the cooperation transmission is during greater than the threshold value preset, Serving cell on the employed RB of said UE to all candidate's cooperation cell transmission coordinated scheduling requests.

8. select the system of cooperation cell among the CoMP; It is characterized in that; This system comprises at least: Serving cell; After being used to receive the response of each candidate's cooperation cell, require strategy, send from all and confirm the target cooperation cell candidate's cooperation cell of agreeing coordinate responses according to maximum strategy of CoMP throughput of system or data rate.

9. system according to claim 8; It is characterized in that; This system further comprises: candidate's cooperation cell, and after being used to receive the coordinated scheduling request of Serving cell transmission, and behind timer expiry; According to the strategy that can improve the total throughput of CoMP system after the cooperation transmission; From the corresponding Serving cell of all coordinated scheduling requests that is directed against same RB of receiving, confirm to carry out the Serving cell of cooperation transmission, and return the agreement coordinate responses, return to other transmission requested service sub-district and disagree with coordinate responses to the Serving cell of confirming that carries out cooperation transmission.

10. according to Claim 8 or 9 described systems; It is characterized in that; Said Serving cell; After also being used to receive the coordinated scheduling request that UE sends, and the rate gain value Δ C that can promote as said UE after the cooperation transmission is during greater than the threshold value preset, on the employed RB of said UE to all candidate's cooperation cell transmission coordinated scheduling requests.

11. according to Claim 8 or 9 described systems, it is characterized in that,

The number of sending the said Serving cell of coordinated scheduling request to same RB is more than one.

12. system according to claim 9 is characterized in that,

The number of said candidate's cooperation cell is more than one.

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