CN101784056A - Method for coordinating interference - Google Patents
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- CN101784056A CN101784056A CN200910077233A CN200910077233A CN101784056A CN 101784056 A CN101784056 A CN 101784056A CN 200910077233 A CN200910077233 A CN 200910077233A CN 200910077233 A CN200910077233 A CN 200910077233A CN 101784056 A CN101784056 A CN 101784056A
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Abstract
The invention discloses a method for coordinating interference, comprising the following steps: dividing time slot resources of adjacent three cells into three parts in advance, wherein all system available frequency resources on one part of time slot resources serve as special time frequency resources, all system available frequency resources on another part of the time slot resources serve as common time frequency resources, and all system available frequency resources on the rest part of the time slot resources serve as shared time frequency resources for the three cells; determining the special time frequency and the common time frequency resource for each cell according to the divided time slot resources; and distributing resources for cell edge users (CEU) and cell central users which request for dispatching respectively by using the above divided time frequency resources so as to lead the system to carry out flexible resource configuration according to the current position of the dispatched users, thus realizing interference coordination among cells which are suitable for a TDD mode system.
Description
Technical field
The present invention relates to the interference coordination technique in the mobile communication system, particularly relate to the method that can realize interference coordination under a kind of time division duplex (TDD) pattern.
Background technology
In mobile communication system, because the decline speed difference of diverse location user experience, signal to noise ratio C/I difference is very big, cause user who is in cell edge and the user who is in center of housing estate that very big difference is arranged on throughput or data rate, this has not only influenced the capacity of whole system, also makes the user in the service quality that diverse location obtains very big difference be arranged.How improving the performance of Cell Edge User, is one of the subject matter that need consider of next generation mobile communication system.
Insert in (TDM-OFDMA) system in time division multiplexing-OFDM, owing to adopt OFDM to insert (OFDMA) as the core transmission technology, this technology utilizes the orthogonal frequency subchannel to distinguish the user can guarantee that the interference between the user is minimum in the sub-district, so that can ignore, therefore, the interference that the user is subjected in the sub-district is mainly from neighbor cell.Particularly under the identical networking situation, can there be the situation of phase mutual interference between the neighbor cell,,, can not guarantees the communication quality of Cell Edge User well as Proportional Fair algorithm (PF) and poll (RR) if only adopt dispatching algorithm under this scene.Like this, just be necessary to adopt Inter-Cell Interference Coordination (Inter-Cell Interference Coordination, ICIC).
Inter-Cell Interference Coordination is a kind of by reducing the scheduling strategy that presence of intercell interference improves the Cell Edge User data transfer rate, promptly making rational planning for and limiting makes the interference that is used for controlling the minizone to the resource (time/frequency/power etc.) of up link and down link by the scheduler in the sub-district, to promote the user experience of edge customer.
Traditional disturbance coordination method mainly is based on Frequency Division Duplexing (FDD) (FDD) system, because the restriction of FDD system frame structure, traditional interference coordination schemes or based on channeling, or based on power division, though these schemes can improve the performance of Cell Edge User, but greatly waste system resource, reduced the overall performance of system.
In today of frequency resource growing tension, tdd mode has been subjected to special attention; Tdd mode can come self adaptation to adjust the timeslot number of uplink and downlink according to the up-downgoing traffic carrying capacity, this for future based on the mobile communication system of the IP type data service particular importance that seems.In addition, aspect the availability of frequency spectrum, the FDD system will distribute a pair of frequency to support the uplink and downlink business respectively in case set up communication, in asymmetric business, because up-downgoing data volume imbalance, there is very big frequency spectrum resource waste like this, thereby makes that the availability of frequency spectrum of FDD system significantly reduces when supporting asymmetric traffic; And the uplink and downlink link transmission of tdd mode is in the same frequency range, and the propagation characteristic of its uplink and downlink signal is identical, and channel exists so-called " reciprocity ", can adopt easily such as new technologies such as smart antenna, pre-RAKE.
Because frame structure and the frame structure under the tdd mode under the fdd mode have very big difference, the most outstanding a bit is exactly to be divided into 10 time slots in the field, has given prominence to the division of time interval resource.Therefore, have now and can not give full play to tdd mode at the significant advantage aspect the availability of frequency spectrum based on the disturbance coordination method of fdd mode, therefore, research is applicable to that the disturbance coordination method of tdd mode system seems particularly important.
A kind of disturbance coordination method that is applicable to the tdd mode system is not proposed at present as yet.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of interference coordination, and this method can realize the interference coordination of tdd mode system.
In order to achieve the above object, the technical scheme of the present invention's proposition is:
A kind of method of interference coordination, this method may further comprise the steps:
A, the time interval resource that in advance three adjacent in twos sub-districts is used are divided into three parts, wherein, all available frequency resources of system on the part time interval resource will be as special-purpose running time-frequency resource, all available frequency resources of system on the part time interval resource will be as common running time-frequency resource, and all available frequency resources of the system on a part of time interval resource will be as the shared shared running time-frequency resource in described three sub-districts; According to the described time interval resource after dividing, determine the special-purpose running time-frequency resource and the common running time-frequency resource of each sub-district;
B, base station are according to the needs of each edge customer of request scheduling in current its sub-district, be respectively described each edge customer Resources allocation, described being assigned as: determine whether the idle special-purpose running time-frequency resource of this sub-district satisfies the needs of this edge customer, if, then give described edge customer with described special-purpose time-frequency resource allocating, otherwise, can satisfy the free time of described edge customer needs and share time-frequency resource allocating to described edge customer;
C, base station are according to the needs of each central user of request scheduling in current its sub-district, be respectively described each central user Resources allocation, described being assigned as: determine whether the idle common running time-frequency resource of this sub-district satisfies the needs of this central user, if, then give described central user with described common time-frequency resource allocating, otherwise, can satisfy the idle special-purpose running time-frequency resource or the idle time-frequency resource allocating of sharing of this sub-district of described central user needs and give described central user.
Preferably, described step a further comprises:
Described shared running time-frequency resource is divided into three parts on frequency domain, the preferential right of described three parts being shared running time-frequency resource disposes respectively to described three sub-districts;
The described free time that can satisfy described edge customer needs shares time-frequency resource allocating and is for described edge customer:
Determine that this sub-district enjoys the free time of preferential right and share running time-frequency resource and whether satisfy described edge customer needs, if, then will describedly enjoy the shared running time-frequency resource of free time of preferential right, distribute to described edge customer; Otherwise, determine that this sub-district do not enjoy the free time of preferential right and share running time-frequency resource and whether satisfy described edge customer needs, if, then will describedly not enjoy the shared running time-frequency resource of free time of preferential right, distribute to described edge customer.
Preferably, the described idle special-purpose running time-frequency resource or the idle time-frequency resource allocating of sharing that can satisfy this sub-district of described central user needs is for described central user:
Whether the idle special-purpose running time-frequency resource of determining this sub-district satisfies described central user needs, if, then give described central user with special-purpose time-frequency resource allocating of described free time, otherwise, can satisfy the free time of described central user needs and share time-frequency resource allocating to described central user.
Preferably, the described shared time-frequency resource allocating of free time that can satisfy described central user needs is for described central user:
Determine that this sub-district enjoys the free time of preferential right and share running time-frequency resource and whether satisfy described central user needs, if, then will describedly enjoy the shared running time-frequency resource of free time of preferential right, distribute to described central user; Otherwise, determine that this sub-district do not enjoy the free time of preferential right and share running time-frequency resource and whether satisfy described central user needs, if, then will describedly not enjoy the shared running time-frequency resource of free time of preferential right, distribute to described central user.
In sum, the disturbance coordination method that the present invention proposes is divided by the time interval resource that in advance will three adjacent in twos sub-districts uses, and makes the system can be according to the current location of dispatched users, carry out the flexible configuration of resource, and then realize the interference coordination of the minizone of tdd mode system.
Description of drawings
Fig. 1 is the flow chart of the embodiment of the invention one.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
Main thought of the present invention is: in the system that adopts tdd mode, its frame structure is divided on time interval resource, based on this, the present invention divides the descending time slot resource of each sub-district in advance, the time interval resource scope difference that the user that is in the sub-district diverse location can preferentially be disposed, for the Cell Edge User Resources allocation of current request scheduling, be the Cell Center User Resources allocation of request scheduling afterwards more then.Like this, can make system carry out the flexible configuration of resource, and then realize the interference coordination of minizone according to the current location of dispatched users.
Fig. 1 is the main flow chart of the embodiment of the invention one, and as shown in Figure 1, embodiment one mainly comprises:
Here need to prove, in existing network model, can adjacent in twos sub-district number be three, therefore, consider that in the present invention with three sub-districts be the interference coordination unit, be configured, realize the interference coordination of minizone by resource to this adjacent in twos sub-district.
In this step, main angle from time slot, the running time-frequency resource that use three adjacent in twos sub-districts is divided, so that the different running time-frequency resource of the user priority of diverse location configuration, in the above-mentioned three part running time-frequency resources, the only configurable user who gives its respective cell of described special-purpose running time-frequency resource and common running time-frequency resource, described shared running time-frequency resource is then used jointly by described three sub-districts, concrete, the described special-purpose running time-frequency resource of each sub-district will preferentially dispose the edge customer to this sub-district, edge customer in the sub-district is fewer, its dedicated time slot resource has under the remaining situation, can distribute to the central user in this sub-district; The central user that the described common running time-frequency resource of each sub-district is given this sub-district with special configuration, and when need be for the central user Resources allocation of sub-district, will be preferentially with the common time-frequency resource allocating of this sub-district to central user; And when the special-purpose running time-frequency resource of sub-district or common running time-frequency resource can not satisfy its user's needs, then can from share running time-frequency resource, obtain idle this user of resource allocation.
Division by above-mentioned resource, especially share the running time-frequency resource part, can make each microzonation give the running time-frequency resource dynamic change of Cell Edge User and central user, improved the flexibility of resource distribution, can effectively realize the interference coordination of minizone on the one hand, also improve the utilance of frequency resource on the other hand, improved the throughput of system.
Further, in order to improve interference coordination ability of the present invention, present embodiment is also divided sharing running time-frequency resource on frequency, promptly, described shared running time-frequency resource is divided into three parts on frequency domain, the preferential right of described three parts being shared running time-frequency resource disposes respectively to described three sub-districts.
Like this, enjoy the shared running time-frequency resource of preferential right, improve the flexibility of sharing time-frequency resource allocating, can reduce the adjacent probability of disturbing frequently of appearance between neighbor cell, thereby effectively reduce the interference level of neighbor cell by dividing different districts.
In this step, for each edge customer method of allocating resources can for:
Determine whether the idle special-purpose running time-frequency resource of this sub-district satisfies the needs of this edge customer, if, then give described edge customer with described special-purpose time-frequency resource allocating, otherwise, can satisfy the free time of described edge customer needs and share time-frequency resource allocating to described edge customer.
Here, when in the step 101 described shared running time-frequency resource being divided into three parts on frequency domain, the described free time that can satisfy described edge customer needs shares time-frequency resource allocating and is for the concrete grammar of described edge customer:
Determine that this sub-district enjoys the free time of preferential right and share running time-frequency resource and whether satisfy described edge customer needs, if, then will describedly enjoy the shared running time-frequency resource of free time of preferential right, distribute to described edge customer; Otherwise, determine that this sub-district do not enjoy the free time of preferential right and share running time-frequency resource and whether satisfy described edge customer needs, if, then will describedly not enjoy the shared running time-frequency resource of free time of preferential right, distribute to described edge customer.Like this, can maximally utilise limited shared running time-frequency resource, improve the availability of frequency spectrum.
In this step, for each central user method of allocating resources can for:
Determine whether the idle common running time-frequency resource of this sub-district satisfies the needs of this central user, if, then give described central user with described common time-frequency resource allocating, otherwise, can satisfy the idle special-purpose running time-frequency resource or the idle time-frequency resource allocating of sharing of this sub-district of described central user needs and give described central user.
Here, pay the utmost attention to and give its central user the common time-frequency resource allocating of sub-district, when the common running time-frequency resource of the free time of not satisfying these central user needs, consider again to give this central user with the idle special-purpose running time-frequency resource of this sub-district or idle shared time-frequency resource allocating.
Preferably, when common running time-frequency resource can not satisfy user's needs, present embodiment is paid the utmost attention to and is given this central user with the idle special-purpose time-frequency resource allocating of this sub-district, when this free time, special-purpose running time-frequency resource can not satisfy user's needs, consider again to give central user with the shared time-frequency resource allocating of free time.Like this, can use the running time-frequency resource of this sub-district as far as possible, and reduce the use of the shared running time-frequency resource that each sub-district is shared, to improve the throughput of system.Correspondingly, be to the concrete grammar of described central user the idle special-purpose running time-frequency resource or the idle time-frequency resource allocating of sharing of this sub-district:
Whether the idle special-purpose running time-frequency resource of determining this sub-district satisfies described central user needs, if, then give described central user with special-purpose time-frequency resource allocating of described free time, otherwise, can satisfy the free time of described central user needs and share time-frequency resource allocating to described central user.
The described free time that can satisfy described central user needs shares time-frequency resource allocating and is for described central user:
Determine that this sub-district enjoys the free time of preferential right and share running time-frequency resource and whether satisfy described central user needs, if, then will describedly enjoy the shared running time-frequency resource of free time of preferential right, distribute to described central user; Otherwise, determine that this sub-district do not enjoy the free time of preferential right and share running time-frequency resource and whether satisfy described central user needs, if, then will describedly not enjoy the shared running time-frequency resource of free time of preferential right, distribute to described central user.
In the present embodiment, be preferably the edge customer Resources allocation by step 102 and 103, and then be the central user Resources allocation, like this, can will share the running time-frequency resource Cell Edge User of distributing to as much as possible, and then improve the performance of Cell Edge User to greatest extent.
Pass through technique scheme, the present invention is at first by dividing the descending time slot resource of each sub-district as can be known, the time interval resource scope difference that the user that is in the sub-district diverse location can preferentially be disposed, utilize the time interval resource after dividing then, be respectively the Cell Edge User and the central user Resources allocation of current request scheduling, thereby make system carry out the flexible configuration of resource, and then realize being applicable to the Inter-Cell Interference Coordination of tdd mode system according to the current location of dispatched users.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. the method for an interference coordination is characterized in that, this method may further comprise the steps:
A, the time interval resource that in advance three adjacent in twos sub-districts is used are divided into three parts, wherein, all available frequency resources of system on the part time interval resource will be as special-purpose running time-frequency resource, all available frequency resources of system on the part time interval resource will be as common running time-frequency resource, and all available frequency resources of the system on a part of time interval resource will be as the shared shared running time-frequency resource in described three sub-districts; According to the described time interval resource after dividing, determine the special-purpose running time-frequency resource and the common running time-frequency resource of each sub-district;
B, base station are according to the needs of each edge customer of request scheduling in current its sub-district, be respectively described each edge customer Resources allocation, described being assigned as: determine whether the idle special-purpose running time-frequency resource of this sub-district satisfies the needs of this edge customer, if, then give described edge customer with described special-purpose time-frequency resource allocating, otherwise, can satisfy the free time of described edge customer needs and share time-frequency resource allocating to described edge customer;
C, base station are according to the needs of each central user of request scheduling in current its sub-district, be respectively described each central user Resources allocation, described being assigned as: determine whether the idle common running time-frequency resource of this sub-district satisfies the needs of this central user, if, then give described central user with described common time-frequency resource allocating, otherwise, can satisfy the idle special-purpose running time-frequency resource or the idle time-frequency resource allocating of sharing of this sub-district of described central user needs and give described central user.
2. method according to claim 1 is characterized in that, described step a further comprises:
Described shared running time-frequency resource is divided into three parts on frequency domain, the preferential right of described three parts being shared running time-frequency resource disposes respectively to described three sub-districts;
The described free time that can satisfy described edge customer needs shares time-frequency resource allocating and is for described edge customer:
Determine that this sub-district enjoys the free time of preferential right and share running time-frequency resource and whether satisfy described edge customer needs, if, then will describedly enjoy the shared running time-frequency resource of free time of preferential right, distribute to described edge customer; Otherwise, determine that this sub-district do not enjoy the free time of preferential right and share running time-frequency resource and whether satisfy described edge customer needs, if, then will describedly not enjoy the shared running time-frequency resource of free time of preferential right, distribute to described edge customer.
3. method according to claim 2 is characterized in that, the described idle special-purpose running time-frequency resource or the idle time-frequency resource allocating of sharing that can satisfy this sub-district of described central user needs is for described central user:
Whether the idle special-purpose running time-frequency resource of determining this sub-district satisfies described central user needs, if, then give described central user with special-purpose time-frequency resource allocating of described free time, otherwise, can satisfy the free time of described central user needs and share time-frequency resource allocating to described central user.
4. method according to claim 3 is characterized in that, the described free time that can satisfy described central user needs shares time-frequency resource allocating and is for described central user:
Determine that this sub-district enjoys the free time of preferential right and share running time-frequency resource and whether satisfy described central user needs, if, then will describedly enjoy the shared running time-frequency resource of free time of preferential right, distribute to described central user; Otherwise, determine that this sub-district do not enjoy the free time of preferential right and share running time-frequency resource and whether satisfy described central user needs, if, then will describedly not enjoy the shared running time-frequency resource of free time of preferential right, distribute to described central user.
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| CN101964980A (en) * | 2010-10-25 | 2011-02-02 | 北京北方烽火科技有限公司 | Method and device for coordinating inter-cell interference |
| CN102026390A (en) * | 2010-12-31 | 2011-04-20 | 大唐移动通信设备有限公司 | Base station and resource allocation method for realizing interference coordination among cells |
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| CN105554772A (en) * | 2016-01-20 | 2016-05-04 | 江苏省邮电规划设计院有限责任公司 | LTE (Long Term Evolution) system interference coordination method |
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