CN101541088A - Method, device and system for eliminating interference among cells - Google Patents
Method, device and system for eliminating interference among cells Download PDFInfo
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Abstract
The invention discloses a method, a device and a system for eliminating the interference among cellular base stations. The method comprises the following steps that: the cellular base station sends use information of time-frequency resources of a cell to a neighbor cell; and a base station of the neighbor cell preferentially selects the resource which does not conflict with the resource indicated by the use information of the time-frequency resources to allocate to users of the cell according to the use information of the time-frequency resources, wherein the use information of the time-frequency resources comprises HII or/and OI information. By the method, the device and the system, the cellar base station can try best to avoid using the resource which conflicts with the resource indicated by the use information of the time-frequency resources when allocating the time-frequency resources for the users of the cell according to the use information of the time-frequency resources, thereby eliminating the interference among the cells.
Description
Technical field
The present invention relates to the communications field, relate in particular to the removing method, the Apparatus and system that disturb between a kind of cellular cell.
Background technology
In the cellular network based on the wireless technology of OFDM (Orthogonal Frequency Division Multiplex, be called for short OFDM), transfer of data relies on base station assigns Physical Resource Block (PRB) to realize.Resource Block (PRB) is distinguished from each other by specific " frequency range-time " combination.
Each cellular cell has a limited number of Resource Block (PRB).If the different user in the same sub-district uses identical PRB transmission data, will cause to interfere with each other.The coordination of PRB in this case relies on base station oneself to realize.And for the several users that is in different districts respectively, if the sub-district is adjacent, and the PRB that each user is assigned with is identical, and then these users might cause interference each other.
At present, for the several users that is in different districts respectively,, also there is not effective solution owing to the identical problem of inter-cell interference that causes of the PRB that is assigned with.
Summary of the invention
Embodiments of the invention provide removing method, device and the system thereof that disturbs between a kind of cellular cell, to eliminate the interference between cellular cell.
The embodiment of the invention provide cellular cell between the removing method that disturbs, may further comprise the steps:
Cell base station uses information to the running time-frequency resource that its neighbor cell sends this sub-district;
Neighbor cell base station is used information according to described running time-frequency resource, and this community user is given in the preferential resource allocation of selecting to use the indicated resource of information not conflict with described running time-frequency resource.
The device that disturbs between the elimination cellular cell that the embodiment of the invention provides comprises:
Transmitting element, the running time-frequency resource that is used for sending to its neighbor cell this sub-district uses information;
Receiving element is used for the running time-frequency resource use information that reception of neighboring cell sends;
Processing unit is used for the preferential resource allocation of selecting to use the indicated resource of information not conflict with the running time-frequency resource that receives and gives this community user.
The communication system that the embodiment of the invention provides comprises: first base station and one or more second base stations that are adjacent, wherein:
First base station, the running time-frequency resource that is used for sending to second base station this sub-district uses information;
Second base station is used for using information according to described running time-frequency resource, and this community user is given in the preferential resource allocation of selecting to use the indicated resource of information not conflict with described running time-frequency resource.
The above embodiment of the present invention is used information by cell base station to the running time-frequency resource that its neighbor cell sends this sub-district, makes neighbor cell base station distribute running time-frequency resource for this community user according to this information.Owing to can indicate the operating position of local resource in the running time-frequency resource use information, the running time-frequency resource that other cell base station is distributed can avoid using with described running time-frequency resource use information in the indicated afoul resource of resource, thereby eliminated the interference of minizone.
Description of drawings
The schematic flow sheet that Fig. 1 distributes by the PRB that sends HII coordination minizone for the embodiment of the invention;
The schematic flow sheet that Fig. 2 distributes by the PRB that sends OI coordination minizone for the embodiment of the invention;
The apparatus structure schematic diagram of Fig. 3 for disturbing between the elimination cellular cell of the embodiment of the invention.
Embodiment
Coordinate the problem of PRB to avoid interference of distribution separately between the different districts in order to solve, 3GPP standardization body has defined two measured values, is provided by the base station, is respectively:
(1) high interference indication (High Interference Indication is called for short HII)
HII has listed the PRB that is scheduled to the user of cell edge.Because these PRB are used at cell edge, so probably will cause interference to neighbor cell.
(2) overload indication (Overload Indicator is called for short OI)
OI has listed the PRB that has been interfered in the sub-district.
The embodiment of the invention will utilize above-mentioned HII or/and OI makes mutual coordinated allocation PRB between the base station, to eliminate the interference of minizone.
Below in conjunction with accompanying drawing the embodiment of the invention is described in detail.
Because HII has indicated the following PRB that may cause interference to neighbor cell, so the interchange of HII information should be carried out when interference potential is bigger.A more rational sight is when the user of cell edge is many, and the edge customer of this sub-district ratio may cause interference to neighbor cell in this case.That is to say that the transmission of HII information is triggered by the load of Cell Edge User.When customer charge surpasses certain threshold value, this sub-district will send to HII information adjacent sub-district, so as neighbor cell when distributing PRB for the user as a reference.This process can be as shown in Figure 1.
Referring to Fig. 1, the schematic flow sheet that the PRB that passes through transmission HII coordination minizone that proposes for the embodiment of the invention distributes.The base station that comprises cell base station and neighbor cell thereof in the communication system architecture that this flow process relates to, for any one cellular cell,, carry out following operation as sub-district A:
This Cell Edge User load is monitored in the base station of step 101, sub-district A (hereinafter referred to as base station A).
Step 102, base station A judge whether the edge customer load surpasses setting threshold, if then execution in step 103; Otherwise, continue this Cell Edge User of monitoring load.
Step 103, base station A send HII information to neighbor cell, indicate the PRB that may cause interference to neighbor cell in the HII information.
The base station of step 104, neighbor cell (more than one of possibility is as base station B wherein) according to the HII information that receives, is avoided PRB indicated in the HII information, thereby potential area interference is avoided when distributing PRB for this community user.
In this step, neighbor cell is after receiving HII information, and the HII that also can feed back oneself is or/and OI information.Can make the Physical Resource Block of minizone coordinate more efficient because exchange HII and OI information between cell base station each other.Because the neighbor cell of base station A may more than one, as a plurality of neighbor cells feedback HII of base station A or/and during OI, may increase the weight of the live load that base station A carries out resource allocation.In order to alleviate the live load of base station A, can be in the following ways:
If base station B has enough resources to make it can avoid the collision of the PRB that distributes with base station A, then this base station B automatically performs the operation of dodging; If base station B is because inadequate resource (or other reasons) can't be avoided the collision of the PRB that distributes with base station A, then by the HII of self or/and OI feeds back, can make base station A attempt adjusting own PRB distribution.
In the flow process shown in Figure 1, the customer charge that cell base station is weighed cell edge has a lot of methods.For instance, can adopt the quantity of total PRB of the CU of cell edge recently to represent divided by the percentage that the PRB total resources number of whole sub-district obtains.When the threshold value (as 40%) that this percentage surpass to be set, cell base station can send to HII information adjacent sub-district, wherein, has listed the PRB that is scheduled to the user of cell edge in the HII information.
Because OI has indicated the PRB that the sub-district has been interfered, so the interchange of OI information is preferably carried out after disturbing generation.A more rational sight is that the annoyance level that is subjected to when the sub-district surpasses when setting threshold value, and cell base station sends the OI information of own detection.This process can be as shown in Figure 2.
Referring to Fig. 2, the schematic flow sheet that the PRB that passes through transmission OI coordination minizone that proposes for the embodiment of the invention distributes.The base station that comprises cell base station and neighbor cell thereof in the communication system architecture that this flow process relates to, for any one cellular cell,, carry out following operation as sub-district A:
(hereinafter referred to as base station A) monitors the interference that this sub-district is subjected in the base station of step 201, sub-district A.
In the flow process shown in Figure 2, base station A also can send HII information simultaneously when sending OI information, and neighbor cell is known the PRB that sub-district A has been interfered and the PRB of prospective project use like this.Thereby make neighbor cell when distributing PRB, avoid using OI and the indicated PRB of HII, and then more effectively avoid the collision of Resource Block for this community user.
In the flow process shown in Figure 2, neighbor cell is after receiving OI (or OI and HII) information, and the OI that also can feed back oneself is or/and HII information.Can make the Physical Resource Block of minizone coordinate more efficient because exchange OI and HII information each other.Because the neighbor cell of base station A may more than one, as a plurality of neighbor cells feedback OI of base station A or/and during HII, may increase the weight of the live load that base station A carries out resource allocation.In order to alleviate the live load of base station A, can be in the following ways:
If base station B has enough resources to make it can avoid the collision of the PRB that distributes with base station A, then this base station B automatically performs the operation of dodging; If base station B is because inadequate resource (or other reasons) can't be avoided the collision of the PRB that distributes with base station A, then by the OI of self or/and HII feeds back, can make base station A attempt adjusting own PRB distribution.
The annoyance level that above-mentioned cell base station measurement sub-district is subjected to has a lot of methods.For instance, the quantity that can adopt the PRB that is interfered is recently represented divided by the percentage that the PRB total resources number of whole sub-district obtains.When the threshold value (as 40%) of this percentage above setting, cell base station can send to OI information adjacent sub-district, wherein, has listed the PRB that has been interfered in this sub-district in the OI information.
Method illustrated in figures 1 and 2 can combine use.Cell base station is monitored the interference that this Cell Edge User is loaded and this sub-district is subjected to simultaneously, sends HII to neighbor cell when the Cell Edge User load surpasses setting threshold, when the interference that is subjected to when the sub-district surpasses setting threshold, sends OI to neighbor cell.Neighbor cell can be with reference to the HII that receives or/and OI be this community user distribution PRB.
The embodiment of the invention also provides a kind of device that disturbs between cellular cell of eliminating.
Referring to Fig. 3, the device that disturbs between the elimination cellular cell that provides for the embodiment of the invention, this device can be integrated and cell base station equipment.This device comprises transmitting element 1, receiving element 2, processing unit 3, also can further comprise monitoring unit 4 and monitoring unit 5.Wherein, monitoring unit 4 and monitoring unit 5 can include only one, also can all comprise two unit.
Transmitting element 1 is used for sending the HII of this sub-district or/and OI to its neighbor cell;
Receiving element 2 is used for the HII of reception of neighboring cell transmission or/and OI;
Monitoring unit 5 is used to monitor the interference that this sub-district is subjected to, and when monitoring interference that this sub-district is subjected to when reaching preset threshold, indication transmitting element 1 its neighbor cell sends OI, or sends OI and HII.
The embodiment of the invention also provides a kind of communication system architecture, one or more cell base stations (hereinafter referred to as base station B) that this framework comprises cell base station (hereinafter referred to as base station A) and is adjacent, wherein:
Base station A is used for sending running time-frequency resource to base station B and uses information, base station B is used for using information according to the running time-frequency resource that receives, be that this community user distributes running time-frequency resource, avoid using as far as possible with running time-frequency resource use information in the indicated afoul running time-frequency resource of running time-frequency resource.As if the generation that base station B can't avoid conflict, then send the running time-frequency resource use information of this sub-district to base station A, base station A uses information according to the running time-frequency resource that base station B sends, and is that this community user distributes running time-frequency resource.
Above-mentioned running time-frequency resource uses information can comprise HII or/and OI, when monitoring, base station A sends HII when this Cell Edge User load reaches preset threshold, send OI when base station A monitors when interference that this sub-district is subjected to reaches preset threshold, or send OI and HII.
In sum, the above embodiment of the present invention is utilized the HII that sends between the base station, has realized avoiding in advance area interference; Utilize the OI that sends between the base station, realized eliminating area interference afterwards.Simultaneously, the load that HII between the base station exchanges according to Cell Edge User triggers, and the OI between the base station exchanges the annoyance level that is subjected to according to the sub-district and triggers, thereby when eliminating area interference, can not cause too big added burden, guarantee the operational efficiency of system system.
In the above embodiment of the present invention; cell base station all based on HII or/and OI information is carried out mutual PRB coordinates to eliminate the interference of minizone; can indicate the information of running time-frequency resource operating position to coordinate PRB by other divides the technical scheme that is equipped with the interference of eliminating the minizone, also should be included within protection scope of the present invention.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (11)
1, the removing method that disturbs between a kind of cellular cell is characterized in that, may further comprise the steps:
Cell base station uses information to the running time-frequency resource that its neighbor cell sends this sub-district;
Neighbor cell base station is used information according to described running time-frequency resource, and this community user is given in the preferential resource allocation of selecting to use the indicated resource of information not conflict with described running time-frequency resource.
2, the method for claim 1 is characterized in that, neighbor cell base station also comprises step after receiving described running time-frequency resource use information:
The running time-frequency resource that feeds back this neighbor cell to described cell base station uses information;
This community user is given in the preferential resource allocation of selecting to use the indicated resource of information not conflict with its running time-frequency resource that receives of described cell base station.
3, method as claimed in claim 2 is characterized in that, neighbor cell base station is used information to described cell base station feedback running time-frequency resource, is specially:
Select when using the resource that the indicated resource of information do not conflict with its running time-frequency resource that receives when described neighbor cell base station, the running time-frequency resource that feeds back this neighbor cell to described cell base station uses information.
As the described method of the arbitrary claim of claim 1 to 3, it is characterized in that 4, described running time-frequency resource use information comprises high interference indication HII or/and overload indication OI.
5, method as claimed in claim 4 is characterized in that, cell base station uses information to the running time-frequency resource that its neighbor cell sends this sub-district, is specially:
When described cell base station monitors this Cell Edge User load when reaching preset threshold, send the running time-frequency resource that comprises HII to its neighbor cell and use information;
Perhaps, when described cell base station monitors interference that this sub-district is subjected to when reaching preset threshold, send the running time-frequency resource that comprises OI to its neighbor cell and use information;
Perhaps, when described cell base station monitors interference that this sub-district is subjected to when reaching preset threshold, send the running time-frequency resource that comprises OI and HII to its neighbor cell and use information.
6, a kind of device that disturbs between cellular cell of eliminating is characterized in that, comprising:
Transmitting element, the running time-frequency resource that is used for sending to its neighbor cell this sub-district uses information;
Receiving element is used for the running time-frequency resource use information that reception of neighboring cell sends;
Processing unit is used for the preferential resource allocation of selecting to use the indicated resource of information not conflict with the running time-frequency resource that receives and gives this community user.
7, device as claimed in claim 6 is characterized in that, described running time-frequency resource use information comprises HII or/and OI; Described device further comprises first monitoring unit or/and second monitoring unit;
Described first monitoring unit is used to monitor this Cell Edge User load, and when monitoring this Cell Edge User load when reaching preset threshold, indicates described transmitting element to send the running time-frequency resource use information that comprises HII to its neighbor cell;
Described second monitoring unit is used to monitor the interference that this sub-district is subjected to, and when monitoring interference that this sub-district is subjected to when reaching preset threshold, indicates its neighbor cell of described transmitting element to send and comprise OI, or the running time-frequency resource that comprises OI and HII uses information.
8, as claim 6 or 7 described devices, it is characterized in that, described processing unit is further used for, when selecting to indicate described transmitting element to use information when using the resource that the indicated resource of information do not conflict to the running time-frequency resource that its neighbor cell sends this sub-district with running time-frequency resource that described receiving element receives.
9, a kind of communication system is characterized in that, comprises first base station and one or more second base stations that are adjacent, wherein:
First base station, the running time-frequency resource that is used for sending to second base station this sub-district uses information;
Second base station is used for using information according to described running time-frequency resource, and this community user is given in the preferential resource allocation of selecting to use the indicated resource of information not conflict with described running time-frequency resource.
10, system as claimed in claim 9 is characterized in that, described second base station is further used for, and when selecting when using the resource that the indicated resource of information do not conflict with described running time-frequency resource, the running time-frequency resource that sends this sub-district to first base station uses information;
Described first base station is further used for, and this community user is given in the preferential resource allocation of selecting to use the indicated resource of information not conflict with its running time-frequency resource that receives.
11, system as claimed in claim 9 is characterized in that, described first base station is further used for, and when described cell base station monitors this Cell Edge User load when reaching preset threshold, sends the running time-frequency resource that comprises HII to its neighbor cell and uses information;
Perhaps, when described cell base station monitors interference that this sub-district is subjected to when reaching preset threshold, send the running time-frequency resource that comprises OI to its neighbor cell and use information;
Perhaps, when described cell base station monitors interference that this sub-district is subjected to when reaching preset threshold, send the running time-frequency resource that comprises OI and HII to its neighbor cell and use information.
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