CN102761912B - Method and system for selecting coordination district from CoMP - Google Patents
Method and system for selecting coordination district from CoMP Download PDFInfo
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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
Technical Field
The present invention relates to a Coordinated Multi-Point transmission/reception (CoMP) technology, and more particularly, to a method and system for selecting a Coordinated cell in CoMP.
Background
The main reason for poor channel condition of User Equipment (UE) at the edge of a cell is due to strong interference generated by neighboring cells, which causes a series of problems such as reduction of throughput and increase of error rate of the system. In the conventional interference cancellation algorithm, the base station operates independently, and although the techniques such as randomized interference and soft frequency reuse are adopted, the inter-cell interference cannot be effectively cancelled, and the performance of the edge UE is improved. Therefore, a CoMP technology arises, and the technology can minimize mutual interference of UE transmissions at different edges between APs by dynamic information interaction and coordination between APs (Access points).
At present, in an existing CoMP system, when an edge UE cannot meet a communication requirement due to strong interference, a serving cell sends a coordinated scheduling request to an adjacent cell, and after receiving the coordinated scheduling request, the adjacent cell makes the following decisions according to interaction information between itself and the serving cell: receiving the request, and performing joint transmission on the frequency band in combination with the serving cell; or, the request is not accepted, the original scheduling result is kept, and the serving cell performs joint transmission with the adjacent cell after receiving the decision of accepting the request sent by the adjacent cell; here, in practical application, there may be two cooperative transmission modes, including: a Single User (SU) -CoMP coordination mode and a multi-User (Multiple User) -CoMP coordination mode; for the SU-COMP cooperation mode, when coordinating and scheduling, the resource of the adjacent cell needs to be sacrificed to replace the performance improvement of the serving cell; for the MU-CoMP coordination mode, a coordination cell needs to find a suitable UE pair to coordinate to complete a complex process of MU-Joint Transmission (JT). However, no matter which cooperation mode is adopted, the selection of the cooperation cell is crucial, and the result of coordinated scheduling is directly influenced.
However, in the prior art, the serving cell directly uses the neighboring cell that sends the acceptance request as the cooperative cell as long as the serving cell receives the decision of the acceptance request sent by the neighboring cell, which may cause a waste of spectrum resources and thus may not effectively improve the throughput of the CoMP system; in addition, it may also cause an inefficient suppression of interference. In addition, when making a decision, the neighboring cell does not consider the coordinated scheduling request sent by other neighboring cells except the serving cell in the coordination set where the neighboring cell is located, which also results in a waste of spectrum resources and an inability to effectively suppress interference.
Disclosure of Invention
In view of the above, the present invention is directed to a method and a system for selecting a coordinated cell in CoMP, which can effectively improve the throughput of the CoMP system.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a method for selecting a coordinated cell in CoMP, which comprises the following steps:
and after receiving the response of each candidate cooperative cell, the serving cell determines a target cooperative cell from all candidate cooperative cells which send the coordination response according to a maximum throughput strategy or a data rate requirement strategy of the CoMP system.
In the above scheme, the determining a target cooperative cell from all candidate cooperative cells that send a consent coordination response according to the maximum throughput policy of the CoMP system includes:
selecting a candidate cooperative cell with the maximum total rate gain value which can be improved by the CoMP system after cooperative transmission as a target cooperative cell from all received candidate cooperative cells which send the agreement coordination response; wherein,
for each candidate cooperative cell sending the consent coordination response, the total rate gain value that the CoMP system can improve is: Δ C ″)iΔ C + Δ C'; where Δ C represents a rate gain value that can be increased by the UE of the serving cell after the cooperative transmission, and Δ C' represents a throughput that is decreased by the candidate cooperative cell itself after the cooperative transmission.
In the foregoing solution, the determining, according to the data rate requirement policy, a target cooperative cell from all candidate cooperative cells that send a consent coordination response includes:
selecting a candidate cooperative cell satisfying the formula from all candidate cooperative cells transmitting the agreement coordination response:the candidate cooperative cell of (2) is taken as a target cooperative cell;
wherein R represents a transmission rate requirement; l represents a candidate cooperative cell set returning an agreement coordination response;presentation protocolMaking a cell set; the above-mentionedThe method comprises the following steps: the serving cell and more than one cell in all the candidate cooperative cells returning the agreement coordination response;representing a set of cooperating cellsTotal throughput of (1);indicating a throughput degradation value of the candidate set of cooperating cells L due to cooperation.
In the above scheme, the method further comprises:
after each candidate cooperative cell receives the coordinated scheduling request and the timer is overtime, according to a strategy which can improve the total throughput of the CoMP system after cooperative transmission, determining a service cell for performing cooperative transmission from all service cells corresponding to the received coordinated scheduling request aiming at the same Resource Block (RB);
and the candidate cooperative cells return an agreement coordination response to the determined serving cell for cooperative transmission, and return an disagreement coordination response to other serving cells sending the request.
In the above solution, after each candidate cooperative cell receives the coordinated scheduling request and after the timer is overtime, according to a strategy that can improve the total throughput of the CoMP system after cooperative transmission, determining a serving cell for performing cooperative transmission from all the serving cells corresponding to the received coordinated scheduling request for the same RB, where the strategy is:
determining, by the candidate cooperative cell, a rate gain value of the CoMP system, which can be brought by the serving cell that sends the coordinated scheduling request, according to a load condition of the candidate cooperative cell;
and selecting the serving cell with the maximum brought rate gain value of the CoMP system as the serving cell for performing cooperative transmission.
In the above solution, the determining the brought rate gain value of the CoMP system corresponding to each serving cell that sends the coordinated scheduling request, and selecting the serving cell with the largest brought rate gain value of the CoMP system as the serving cell that performs the cooperative transmission includes:
if the self scheduling result of the candidate cooperative cell is not changed and the request is not accepted, the rate gain value brought by the CoMP system is obtained
If the frequency band is abandoned and the request is received, the rate gain value brought to the CoMP system is carried out for each service cellSelecting Δ C that results in a maximum rate gain valuep，nAs a value of rate gain to the CoMP system
If the frequency band is exchanged and the request is accepted, the idle RB is adoptedkThe value of the rate gain that can be brought to the CoMP system for each serving cellThen selects the Δ C that results in the maximum rate gainp，kAs a value of rate gain to the CoMP system
According to the formula:determining a serving cell for cooperative transmission;
wherein,UE m representing candidate cooperative cells0RB in candidate cooperative cellpThe transmission rate of (c);UEm representing serving cell nnRB Using candidate cooperative cellpAn incremental value of the transmission rate of time;represents UE m0Idle RBs in candidate cooperative cellskThe transmission rate of (c).
In the above scheme, the method further comprises:
after receiving a coordinated scheduling request sent by UE, and when a rate gain value Delta C which can be improved by the UE after cooperative transmission is larger than a preset threshold value, a serving cell sends the coordinated scheduling request to all candidate cooperative cells on an RB used by the UE.
The invention also provides a system for selecting a coordinated cell in CoMP, which at least comprises: and the serving cell is used for determining a target cooperative cell from all the candidate cooperative cells which send the coordination agreement response according to the maximum throughput strategy or the data rate requirement strategy of the CoMP system after receiving the response of each candidate cooperative cell.
In the above solution, the system further includes: and the candidate cooperative cells are used for determining the serving cells for cooperative transmission from all the serving cells corresponding to the received coordinated scheduling requests for the same RB according to a strategy capable of improving the total throughput of the CoMP system after the coordinated scheduling requests sent by the serving cells are received and the timer is overtime, returning the coordination approval response to the determined serving cells for cooperative transmission, and returning the coordination disapproval response to other serving cells sending the requests.
In the foregoing solution, the serving cell is further configured to send a coordinated scheduling request to all candidate cooperative cells on an RB used by the UE after receiving the coordinated scheduling request sent by the UE and when a rate gain Δ C that can be increased by the UE after cooperative transmission is greater than a preset threshold.
In the above scheme, the number of the serving cells sending the coordinated scheduling request for the same RB is more than one.
In the above scheme, the number of the candidate cooperative cells is more than one.
According to the method and the system for selecting the coordinated cells in the CoMP, after the serving cell receives the response of each candidate coordinated cell, the target coordinated cell is determined from all candidate coordinated cells which send the agreed coordination response according to the maximum throughput strategy or the data rate requirement strategy of the CoMP system, so that a better coordinated cell can be effectively selected, the throughput of the CoMP system is improved, and the advantages of the CoMP technology are further utilized more efficiently.
In addition, after each candidate cooperative cell receives the coordinated scheduling request and the timer is overtime, according to the strategy that the total throughput of the CoMP system can be improved after cooperative transmission, the serving cell for cooperative transmission is determined from all the serving cells corresponding to the received coordinated scheduling request aiming at the same RB.
Drawings
Fig. 1 is a schematic flow chart illustrating a method for selecting a coordinated cell in CoMP according to the present invention;
fig. 2 is a flowchart illustrating a method for selecting a cooperating cell in CoMP according to an embodiment.
Detailed Description
The basic idea of the invention is: and after receiving the response of each candidate cooperative cell, the serving cell determines a target cooperative cell from all candidate cooperative cells which send the coordination response according to a maximum throughput strategy or a data rate requirement strategy of the CoMP system.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The method for selecting a coordinated cell in CoMP according to the present invention, as shown in fig. 1, includes the following steps:
step 101: after each candidate cooperative cell receives the coordinated scheduling request and the timer is overtime, according to a strategy which can improve the total throughput of the CoMP system after coordination, determining a service cell for cooperative transmission from all service cells corresponding to the received coordinated scheduling request aiming at the same RB;
specifically, the candidate cooperative cells determine, according to their own load conditions, a rate gain value of the CoMP system that can be brought by each serving cell that sends the coordinated scheduling request;
and then selecting the serving cell with the maximum rate gain value of the CoMP system as the serving cell for performing cooperative transmission.
Before this step, the method may further include:
after receiving a coordinated scheduling request sent by UE (user equipment), and when a rate gain value delta C which can be improved by the UE after cooperative transmission is larger than a preset threshold value, a serving cell sends the coordinated scheduling request to all candidate cooperative cells on an RB used by the UE; wherein, the coordinated scheduling request sent to all candidate cooperative cells includes: and when each candidate cooperative cell is adopted to perform cooperative transmission on the UE, the UE can increase the rate gain value delta C.
Step 102: the candidate cooperative cells return an agreement coordination response to the determined serving cell for cooperative transmission, and return an disagreement coordination response to other serving cells sending the request;
here, the consent coordination response includes: after the cooperative transmission, the reduced throughput Δ C' of the candidate cooperative cell itself may be obtained by using the prior art.
Step 103: and after receiving the response of each candidate cooperative cell, the serving cell determines a target cooperative cell from all candidate cooperative cells which send the coordination response according to a maximum throughput strategy or a data rate requirement strategy of the CoMP system.
Here, the determining the target cooperative cell from all candidate cooperative cells that send the consent coordination response according to the maximum throughput policy of the CoMP system specifically includes:
and selecting the candidate cooperative cell with the maximum total rate gain value which can be improved by the CoMP system after cooperative transmission as a target cooperative cell from all the received candidate cooperative cells which send the agreement coordination response.
The determining a target cooperative cell from all candidate cooperative cells according to the data rate strategy specifically includes:
selecting a material satisfying the formula:
the candidate cooperative cell of (2) is taken as a target cooperative cell, wherein R represents a transmission rate requirement; l represents a candidate cooperative cell set returning an agreement coordination response;representing a set of cooperating cells; the above-mentionedThe method comprises the following steps:the serving cell and more than one cell in all the candidate cooperative cells returning the agreement coordination response;representing a set of cooperating cellsTotal throughput of (1);indicating a throughput degradation value of the candidate set of cooperating cells L due to cooperation.
The present invention will be described in further detail with reference to examples.
In a CoMP system with multiple cells, a downlink data Signal sent by a serving cell is an Interference Signal for a UE with the same frequency in an adjacent cell, and especially for an edge UE in the adjacent cell, the Interference Signal may be quite strong, which may result in a very low Signal to Interference plus Noise Ratio (SINR), and therefore, in this case, the edge UE in the adjacent cell can only support a code modulation scheme with a relatively low rate, which may cause a low throughput of a service. Here, the co-frequency UEs refer to UEs using the same RB.
As shown in fig. 2, the method for selecting a coordinated cell in CoMP according to this embodiment includes the following steps:
step 201: after receiving a coordinated scheduling request sent by UE, a serving cell sends the coordinated scheduling request to all candidate cooperative cells on an RB used by the UE;
here, the serving cell sends a coordinated scheduling request to all candidate cooperating cells over the X2 interface.
Before this step, the serving cell divides the UEs into UEs (UE-Co) requiring cooperative transmission and UEs (UE-NCo) not requiring cooperative transmission according to the actual conditions and requirements of the UEs owned by the serving cell, and allocates RBs to each UE.
The service cell divides the UE into UE-CO and UE-NCO according to the channel quality of the UE in one frame time; here, the channel quality may specifically be: UE uplink feedback channel quality or uplink receiving estimation channel quality;
the serving cell divides the UE into UE-CO and UE-NCO according to the channel quality of the UE in one frame time, specifically:
judging whether the average SINR in one frame time of the UE is larger than a threshold value (SINR)gate) If the channel condition of the UE is larger than the threshold value, the channel condition of the UE is considered to be poor, the UE is divided into UE-Co, and if the channel condition of the UE is smaller than the threshold value, the channel condition of the UE is considered to be good, and the UE is divided into UE-NCo;
wherein the SINRgateThe dynamic change of the actual network load condition can be determined so as to obtain the optimal UE group distribution.
When the RB is distributed for the UE, the serving cell distributes the RB for the UE according to a proportional fairness algorithm, and the cooperation factor is not considered.
Here, the serving cell divides the UE into UE-Co and UE-NCo according to the actual situation and requirement of the UE owned by the serving cell, and the specific process of allocating RBs to each UE is exactly the same as the prior art.
The coordinated scheduling request sent by the UE is as follows: a coordinated scheduling request transmitted for the RB used by itself.
The serving cell may determine the candidate cooperative cell according to the RB used by the UE, and a specific processing procedure is the prior art.
The number of candidate cooperative cells may be more than one.
The coordinated scheduling request sent to all candidate cooperative cells includes: when each candidate cooperative cell is adopted to perform cooperative transmission on the UE, the UE can increase the rate gain value delta C; the rate gain value Δ C that the UE can boost is: a difference between a transmission rate after the UE performs the cooperation and a transmission rate before the cooperation.
The serving cell sends the coordinated scheduling request to all candidate cooperative cells on the RB used by the UE at the following timing: after the rate gain value delta C which can be increased by the UE is larger than a preset threshold value; and when the threshold value is set, setting according to the actual system requirement.
Step 202: after each candidate cooperative cell receives the coordinated scheduling request and the timer is overtime, according to a strategy which can improve the total throughput of the CoMP system after cooperative transmission, determining a service cell for performing cooperative transmission from all service cells corresponding to the received coordinated scheduling request aiming at the same RB;
here, the duration of the timer may be set according to the need, such as: one frame.
The determining, according to the strategy that can improve the total throughput of the CoMP system after cooperative transmission, a serving cell for performing cooperative transmission from serving cells corresponding to received coordinated scheduling requests for the same RB includes:
determining, by the candidate cooperative cell, a rate gain value of the CoMP system, which can be brought by the serving cell that sends the coordinated scheduling request, according to a load condition of the candidate cooperative cell;
selecting the service cell with the maximum brought rate gain value of the CoMP system as a service cell for performing cooperative transmission;
in practical application, the above process specifically includes:
the scheduling result is not changed, and the request is not accepted, at the moment, the rate gain value brought to the CoMP system
Abandoning the frequency band of the CoMP system, and receiving the request, wherein the rate gain value brought to the CoMP system is applied to each service cellThen selects the Δ C that brings the maximum rate gain valuep，nAs a value of rate gain to the CoMP system
Switching the frequency band, receiving the request, and adopting the idle RBkThe value of the rate gain that can be brought to the CoMP system for each serving cellThen selects the Δ C that results in the maximum rate gainp，kAs a value of rate gain to the CoMP system
Wherein,UE m as candidate cooperative cell0RB in candidate cooperative cellpThe transmission rate of (c);for UE m from serving cell nnRB Using candidate cooperative cellpThe transmission rate increase value of time, namely: a rate gain value Δ C that the UE can boost;represents UE m0Idle RBs in candidate cooperative cellskThe transmission rate of (c); here, the candidate cooperative cell may be obtained by the related art
RB when candidate cooperative cellpWhen there is no same frequency UE, then order
The serving cell with the largest rate gain value of the CoMP system, which can be brought by the selection, is used as the serving cell for performing cooperative transmission, and may be expressed by the following formula:
if the frequency band is selected to be changed, a certain serving cell in the decision of receiving the request is taken as a serving cell for performing cooperative transmission, and the specific implementation process can be expressed by the following formula:
(1)
wherein n is*Δ C representing the selected maximum rate gain value that can bring the CoMP systemp，kA corresponding serving cell; k is a radical of*Δ C representing the selected maximum rate gain value that can bring the CoMP systemp，kThe corresponding free RB.
In practical applications, since the transmission capability on each RB is different, it may occurIn this case, UE m is called0In the state of 'loss',means "loss value". In this case, if there is still a spare frequency band in the candidate cooperative cell, let And regarding the residual data rate requirement as an internal request, scheduling the residual data rate requirement together with the coordinated scheduling requests of other serving cells, and if the candidate cooperative cell has no spare frequency band, not performing any treatment.
In special cases, there are times when not fully loadedAt this time if all the remaining RB sets are setIn (1), satisfy
At this time, the load capacity of the candidate cooperative cell is called "false shortage", and in this case, the decision of exchanging the frequency band and receiving the request is made, and the serving cell is selected according to the formula (1).
The purpose of performing step 202 is: selecting a coordinated scheduling request of a serving cell, and arranging RBs (resource blocks) of joint processing as much as possible for the coordinated scheduling request with the maximum throughput of the CoMP system; for the UE which abandons the RB, the idle resource is searched for compensation.
Step 203: the candidate cooperative cells return an agreement coordination response to the determined serving cell for cooperative transmission, and return an disagreement coordination response to other serving cells sending the request;
here, the consent coordination response includes: after the cooperative transmission, the reduced throughput Δ C' of the candidate cooperative cell itself may be obtained by using the prior art.
Step 204: after receiving the response of each candidate cooperative cell, the serving cell determines a target cooperative cell from all candidate cooperative cells which send the coordination agreement response according to a maximum throughput strategy or a data rate requirement strategy of the CoMP system;
here, the determining the target cooperative cell from all candidate cooperative cells that send the consent coordination response according to the maximum throughput policy of the CoMP system specifically includes:
and selecting the candidate cooperative cell with the maximum total rate gain value which can be improved by the CoMP system after cooperative transmission as a target cooperative cell from all the received candidate cooperative cells which send the agreement coordination response.
The method is expressed by a formula, and specifically comprises the following steps:
after cooperative transmission, the total rate gain value delta C ″, which can be improved by each candidate cooperative cell to the CoMP systemiΔ C + Δ C'; according to the formula: i ═ arg max { Δ C ″)iAnd selecting a target cooperative cell.
In practical application, each UE has a corresponding rate requirement as long as the CoMP network is not full-buffer; the full-buffer means that each UE has an unlimited amount of data to send, and therefore, in the target cooperative cell selection, a cell that can meet a rate requirement, has the least resource waste, and has the least influence on an adjacent cell should be selected, and therefore, according to the data rate policy, a target cooperative cell is determined from all candidate cooperative cells that send a consent coordination response, specifically:
wherein R represents a transmission rate requirement; l represents a candidate cooperative cell set returning an agreement coordination response;representing a set of cooperating cells; the above-mentionedThe method comprises the following steps: serving cell and more than one cell of all candidate cooperative cells returning responses agreeing to coordination;representing a set of cooperating cellsTotal throughput of (1);representing a throughput degradation value of the candidate set of cooperating cells L due to cooperation; wherein, can be obtained by adopting the prior artAndfor theThe sum of the throughputs of the serving cell and each candidate cooperative cell returning the agreement coordination response can be used as the calculation of (2)Or, the sum of the throughputs of the serving cell and two cells in all candidate cooperative cells returning responses agreeing to coordination is used as the sumAnd so on until a target cooperative cell satisfying the condition is obtained, for example, it is assumed that the candidate cooperative cells returning the response agreeing to the coordination include: second candidate cooperative cell AP2, third candidate cooperative cell AP3. And a fifth candidate cooperative cell AP5, under calculationWhen the sum of the throughputs of the service cell and the AP2, the AP3 and the AP5 is threeSum of throughputs of serving cell and AP2, AP3 as oneSum of throughputs of serving cell and AP2, AP5 as oneSum of throughputs of serving cell and AP3, AP5 as oneSum of throughputs of serving cell and AP2, AP3, and AP5 as oneUntil a target cooperative cell meeting the condition is obtained. Accordingly, the method can be used for solving the problems that,to calculateAnd the throughput corresponding to the selected candidate cooperative cell is reduced.
Here, β∈ [0,1 ]]When β is 1, the result of equation (3) indicates that the neighbor cell that satisfies the rate requirement with the least waste is selected as the cooperating cell, without considering the impact on the neighbor cell throughput when β is 0, the result of equation (3) indicates that the rate requirement is satisfiedUnder the condition (2), the neighboring cell having a small influence on the neighboring cell is selected as a cooperative cell as much as possible. This is achieved byThe β value may be dynamically changed according to actual system requirements.
Here, in the selection of the target cooperative cell, if three conditions of rate requirement, minimum waste of resources, and minimum influence on the neighboring cell are to be simultaneously satisfied, the selection of the target cooperative cell needs to simultaneously satisfy the following formula:
obviously, the formula (4) and the formula (5) cannot be satisfied simultaneously, and therefore, a factor β needs to be introduced.
Step 204 is performed for the purpose of: and selecting candidate cooperative cells which are willing to assist the candidate cooperative cells to perform cooperative transmission, and selecting the optimal target cooperative cell according to the requirement of maximizing system throughput or the consideration of fairness, thereby efficiently utilizing the technical advantages of cooperative transmission.
In practical application, the serving cell may not determine any target cooperative cell according to the policy, and may determine the number of target cooperative cells according to the policy to be more than one.
Step 205: and the serving cell and the target cooperative cell transmit data together according to a physical transmission mode agreed in advance.
Here, the specific processing procedure for the serving cell and the target cooperative cell to send data together according to the pre-agreed physical transmission mode is the same as that in the prior art, and is not described here again.
In order to implement the method, the present invention further provides a system for selecting a coordinated cell in CoMP, where the system at least includes: and the serving cell is used for determining a target cooperative cell from all the candidate cooperative cells which send the coordination agreement response according to the maximum throughput strategy or the data rate requirement strategy of the CoMP system after receiving the response of each candidate cooperative cell.
The system can also further comprise a candidate cooperative cell, which is used for determining the serving cell for cooperative transmission from all the serving cells corresponding to the received cooperative scheduling requests aiming at the same RB according to a strategy capable of improving the total throughput of the CoMP system after the timer is overtime after the cooperative scheduling requests sent by the serving cells are received, returning the coordination agreement response to the determined serving cell for cooperative transmission and returning the coordination disagreement response to other serving cells sending the requests;
the serving cell is further configured to send a coordinated scheduling request to all candidate cooperative cells on an RB used by the UE after receiving the coordinated scheduling request sent by the UE and when a rate gain Δ C that can be increased by the UE after cooperative transmission is greater than a preset threshold.
Here, it should be noted that: the number of the serving cells sending the coordinated scheduling request aiming at the same RB is more than one, and the number of the candidate cooperative cells is more than one.
Here, the specific processing procedures of the serving cell and the candidate cooperative cell in the system of the present invention have been described in detail above, and are not described again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A method for selecting a cooperating cell in coordinated multi-point transmission (CoMP), the method comprising:
after each candidate cooperative cell receives the coordinated scheduling request and the timer is overtime, according to a strategy which can improve the total throughput of the CoMP system after cooperative transmission, determining a service cell for performing cooperative transmission from all service cells corresponding to the received coordinated scheduling request aiming at the same Resource Block (RB);
the candidate cooperative cells return an agreement coordination response to the determined serving cell for cooperative transmission, and return an disagreement coordination response to other serving cells sending the request;
and after receiving the response of each candidate cooperative cell, the serving cell determines a target cooperative cell from all candidate cooperative cells which send the coordination response according to a maximum throughput strategy or a data rate requirement strategy of the CoMP system.
2. The method of claim 1, wherein the determining the target cooperative cell from all candidate cooperative cells sending the consent coordination response according to the CoMP system throughput maximization strategy comprises:
selecting a candidate cooperative cell with the maximum total rate gain value which can be improved by the CoMP system after cooperative transmission as a target cooperative cell from all received candidate cooperative cells which send the agreement coordination response; wherein,
for each candidate cooperative cell sending the consent coordination response, the total rate gain value that the CoMP system can improve is: delta C'iΔ C + Δ C'; where Δ C represents a rate gain value that a User Equipment (UE) of the serving cell can increase after the cooperative transmission, and Δ C' represents a throughput that the candidate cooperative cell itself decreases after the cooperative transmission.
3. The method of claim 1, wherein the determining the target cooperative cell from all candidate cooperative cells sending the consent coordination response according to the data rate requirement policy comprises:
selecting a candidate cooperative cell satisfying the formula from all candidate cooperative cells transmitting the agreement coordination response:the candidate cooperative cell of (2) is taken as a target cooperative cell;
wherein, β∈ [0,1](ii) a R represents the transmission rate requirement; l represents a candidate cooperative cell set returning an agreement coordination response;representing a set of cooperating cells; the above-mentionedThe method comprises the following steps: the serving cell and more than one cell in all the candidate cooperative cells returning the agreement coordination response;representing a set of cooperating cellsTotal throughput of (1);indicating a throughput degradation value of the candidate set of cooperating cells L due to cooperation.
4. The method of claim 1, wherein after each candidate cooperative cell receives the coordinated scheduling request and after the timer expires, according to a strategy for increasing the total throughput of the CoMP system after cooperative transmission, determining the serving cell performing cooperative transmission from all the serving cells corresponding to the received coordinated scheduling requests for the same RB, where the strategy is as follows:
determining, by the candidate cooperative cell, a rate gain value of the CoMP system, which can be brought by the serving cell that sends the coordinated scheduling request, according to a load condition of the candidate cooperative cell;
and selecting the serving cell with the maximum brought rate gain value of the CoMP system as the serving cell for performing cooperative transmission.
5. The method according to claim 4, wherein the determining the brought rate gain value of the CoMP system corresponding to each serving cell that sends the coordinated scheduling request, and selecting the serving cell with the largest brought rate gain value of the CoMP system as the serving cell for performing the cooperative transmission comprises:
if the self scheduling result of the candidate cooperative cell is not changed and the request is not accepted, the rate gain value brought by the CoMP system is obtained
If the frequency band is abandoned and the request is received, the rate gain value brought to the CoMP system is carried out for each service cellSelecting Δ C that results in a maximum rate gain valuep,nAs a value of rate gain to the CoMP system
If the frequency band is exchanged and the request is accepted, the idle RB is adoptedkThe value of the rate gain that can be brought to the CoMP system for each serving cellThen selects the Δ C that results in the maximum rate gainp,kAs a value of rate gain to the CoMP system
According to the formula:determining a serving cell for cooperative transmission;
wherein,UE m representing candidate cooperative cells0RB in candidate cooperative cellpThe transmission rate of (c);UE m representing a serving cell nnRB Using candidate cooperative cellpAn incremental value of the transmission rate of time;represents UE m0Idle RBs in candidate cooperative cellskThe transmission rate of (c).
6. The method of claim 1, further comprising:
after receiving a coordinated scheduling request sent by UE, and when a rate gain value Delta C which can be improved by the UE after cooperative transmission is larger than a preset threshold value, a serving cell sends the coordinated scheduling request to all candidate cooperative cells on an RB used by the UE.
7. A system for selecting a cooperating cell in CoMP, the system comprising at least: the serving cell is used for determining a target cooperative cell from all candidate cooperative cells which send the coordination agreement response according to a maximum throughput strategy or a data rate requirement strategy of the CoMP system after receiving the response of each candidate cooperative cell;
and the candidate cooperative cells are used for determining the serving cells for cooperative transmission from all the serving cells corresponding to the received coordinated scheduling requests for the same RB according to a strategy capable of improving the total throughput of the CoMP system after the coordinated scheduling requests sent by the serving cells are received and the timer is overtime, returning the coordination approval response to the determined serving cells for cooperative transmission, and returning the coordination disapproval response to other serving cells sending the requests.
8. The system of claim 7, wherein the serving cell is further configured to send a coordinated scheduling request to all candidate cooperative cells on an RB used by the UE after receiving the coordinated scheduling request sent by the UE and when a rate gain Δ C that can be increased by the UE after cooperative transmission is greater than a preset threshold.
9. The system of claim 7,
the number of the serving cells sending the coordinated scheduling request aiming at the same RB is more than one.
10. The system of claim 7,
the number of the candidate cooperative cells is more than one.
Priority Applications (1)
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| CN101895940A (en) * | 2010-07-26 | 2010-11-24 | 北京邮电大学 | Method for distributing resources between main service cell and coordinate cells |
| CN101909321A (en) * | 2009-06-02 | 2010-12-08 | ***通信集团公司 | Method, cooperation functional entity and system for cell resource scheduling |
| CN101951307A (en) * | 2010-09-24 | 2011-01-19 | 西安电子科技大学 | Method for selecting cell cooperation set under CoMP |
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| CN101909321A (en) * | 2009-06-02 | 2010-12-08 | ***通信集团公司 | Method, cooperation functional entity and system for cell resource scheduling |
| CN101895940A (en) * | 2010-07-26 | 2010-11-24 | 北京邮电大学 | Method for distributing resources between main service cell and coordinate cells |
| CN101951307A (en) * | 2010-09-24 | 2011-01-19 | 西安电子科技大学 | Method for selecting cell cooperation set under CoMP |
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| Enhanced Dynamic Cell Selection with Muting;Minghai Feng*, Xiaoming She*等;《IEEE》;20100131;全文 * |
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