CN101242640A - Inter-cell interference restraint method, base station and system for restraining inter-cell interference - Google Patents
Inter-cell interference restraint method, base station and system for restraining inter-cell interference Download PDFInfo
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- CN101242640A CN101242640A CNA2007100637289A CN200710063728A CN101242640A CN 101242640 A CN101242640 A CN 101242640A CN A2007100637289 A CNA2007100637289 A CN A2007100637289A CN 200710063728 A CN200710063728 A CN 200710063728A CN 101242640 A CN101242640 A CN 101242640A
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Abstract
The invention discloses a method for rejecting interference between cells, which includes: A. determining frequency bandwidth according to service type of user equipment UE when it is determined that allocating downlink resource for UE is needed; B. selecting frequency band which is not occupied by adjacent cells from available downlink resources of the cell where the UE is located based on determined frequency bandwidth, and allocating the same to the UE. The invention also discloses a base station, including interference rejection unit, receiving available downlink resources of the cell where the UE is located from external, determining frequency bandwidth according to service type of user equipment UE when it is determined downlink resource needs to be allocated for UE, and selecting frequency band which is not occupied by adjacent cells from available downlink resource, allocating the same to the UE. Moreover, the invention also provides a system for rejecting interference between cells, which includes wireless network controller and base station. The inventive scheme can realize rejection of interference between cells by simple operation.
Description
Technical field
The present invention relates to wireless communication technology, relate in particular to inter-cell interference restraint method, the base station in a kind of OFDM (OFDM) system and be used to suppress the system of presence of intercell interference.
Background technology
Constantly perfect along with the fast development of wireless communication technology and communications device functions, for the availability of frequency spectrum that improves wireless communication system and higher message transmission rate is provided, and then improving the competitiveness of the third generation (3G) mobile communication technology in mobile communication market, third generation collaborative project partner (3GPP) tissue has proposed to support up to the upstream rate of 100Mbps and Long Term Evolution (LTE) system of 50Mbps downstream rate.
One of candidate's core technology that the LTE system comparatively pays close attention to is the OFDM technology.In the system that adopts the OFDM technology, channel is divided into several orthogonal sub-channels, and high-speed data-flow is converted into parallel low speed sub data flow, and is modulated on each subchannel and transmits.Like this, because the particularity of OFDM technology itself not only can be resisted frequency selective fading effectively in the ofdm system, and can be eliminated intersymbol interference to a great extent, and can obtain the multi-user diversity gain of frequency domain, improve the overall efficiency of system.
In ofdm system, the prerequisite of business realizing is to be subscriber equipment (UE) Resources allocation.In the assigning process of downlink resource, determine at first to determine the frequency range that this UE is required need be for UE allocation of downlink resource the time that when the needs network side then the base station is carried out the selection of frequency range and distributed to this UE at present available downlink resource according to type of service.Fig. 1 shows the resource allocation schematic diagram of each cellular cell in the ofdm system.Referring to Fig. 1,, suppose that the maximum frequency range of each sub-district is respectively 20MHz, 5MHz, 10MHz, 5MHz, 10MHz, 1.6MHz, 2.5MHz and 5MHz at certain time point.When using above-mentioned resource allocation methods, understand between neighbor cell owing to the frequency crossover disturbs, i.e. presence of intercell interference.For example, be in the UE at 3 edges, sub-district and the UE mutual interference mutually at 4 edges, sub-district.Lower like this, the to a great extent quality of service of ofdm system.
In order to guarantee quality of service, adopt modes such as presence of intercell interference randomization, presence of intercell interference cancellation or the Inter-Cell Interference Coordination stipulated in 3GPP 25.814 agreements/avoid at present usually, suppress presence of intercell interference.
Under the presence of intercell interference randomised way, network side is each cell allocation pseudorandom scrambler in advance, sets up model or the definite frequency hopping mode of interweaving, so that distinguish each sub-district.Determine need be for UE allocation of downlink resource the time at network side, the downlink resource and the above-mentioned pseudorandom scrambler that are distributed, interweave model or frequency hopping mode are combined, interference signal is turned to white noise at random, thereby the presence of intercell interference that makes UE receive is inhibited.Under presence of intercell interference cancellation mode, as the network equipment of transmitting terminal by many antennas complementary or branch multiple access (IDMA) means that interweave, handle transmitting, UE as receiving terminal will be subjected to the signal of interfered cell to carry out demodulation, decoding, obtain echo signal and interference signal, and then interference signal is duplicated and eliminated.At Inter-Cell Interference Coordination/avoid under the mode, the means that employing is coordinated are come the downlink resource between restricted cell, promptly the measurement report that reports according to UE is determined the channel quality or the annoyance level of down link, and frequency resource is divided into several multiplexing collection, the user of center of housing estate can adopt lower power emission and reception, therefore can not cause stronger interference even take identical frequency yet, be dispensed on multiplexing coefficient and be 1 multiplexing concentrating; The user of cell edge adopts higher power emission and reception, might cause stronger interference, and therefore being dispensed on frequency reuse is that the multiplexing of N concentrated.
Yet, no matter adopt randomization, cancellation mode, still coordinate/avoid mode, in suppressing the process of presence of intercell interference, all need to carry out a large amount of codings and calculate to wait operation according to dispatching algorithm, implementation is complexity comparatively; And these codings and calculating operation also make the transmitting terminal or the receiving terminal that participate in the OFDM transmission need carry out bigger workload, bear heavier.
Summary of the invention
The invention provides a kind of inter-cell interference restraint method, can reduce the complicated operation degree.In the method for reduction presence of intercell interference of the present invention, may further comprise the steps:
A. determining to determine frequency range according to the type of service of this UE need be for user equipment (UE) allocation of downlink resource the time;
B. according to determined frequency range, from the available downlink resource of this sub-district, UE place, the frequency range of selecting not to be taken by neighbor cell is distributed to this UE as selected frequency range.
Preferably, be each frequency allocation priority at each sub-district in advance, and the corresponding frequency band of neighbor cell has different priority, then step B is described according to determined frequency range, from the available downlink resource of this sub-district, UE place, the frequency range of selecting not taken by neighbor cell comprises as selected frequency range:
B1. the current frequency range that is not taken fully by other UE in the sub-district, described UE place is determined, as described available downlink resource according to the resource management record of self preserving in the base station;
B2. base station the frequency range that frequency range is corresponding and priority is the highest that need with described UE to select from described available downlink resource is as selected frequency range.
Preferably, further comprise before the described steps A: for each resource units (RU) in each frequency range distributes priority;
Further comprise before the described step B: the RU number of determining these UE needs according to the type of service of described UE;
The frequency range that the described selection of step B is not taken by neighbor cell is as after the selected frequency range, further comprise: the base station is according to the RU number of described UE needs, begin to select from the highest RU of selected frequency range medium priority, determine selected RU, carry out the operation of the described UE of distributing to then.
Preferably, describedly determine further to comprise after the selected RU: the priority of described selected RU is reduced to minimum, and with the priority raising of other RU of described selected frequency range.
Preferably, this method further comprises: when the base station knows that UE discharges employed RU, with the priority raising of d/d RU.
The present invention also provides a kind of base station, can reduce the complicated operation degree of presence of intercell interference process of inhibition.In this base station, comprise: disturb and suppress the unit, this unit receives the available downlink resource that comes from this outside sub-district, place, base station, determining need be for user equipment (UE) allocation of downlink resource the time, type of service according to this UE is determined frequency range, and according to determined frequency range, from described available downlink resource, select the frequency range do not taken, as selected frequency range and distribute to this UE by neighbor cell.
Specifically, described interference suppresses the unit and comprises: communication module, memory module and resource distribution module, wherein,
Described communication module receives the frequency range precedence information that comes from this outside base station respective cell, and the frequency range precedence information that receives is sent to memory module; Reception comes from the selected band information of resource distribution module, and this selected band information is sent to the UE that needs downlink resource;
Described memory module reception comes from the frequency range precedence information of communication module and preserves, and preserves the business information record of each UE and the resource management record of base station, and upgrades the resource management record under the indication of resource distribution module;
Described resource distribution module is determined to be UE allocation of downlink resource, reads the type of service of this UE from memory module, determines the frequency range of these UE needs according to the type of service that reads; From memory module, read the resource management record, determine the current available downlink resource of sub-district, UE place; From memory module, read the frequency range precedence information,, from current available downlink resource, select the highest frequency range of priority, selected band information is sent to communication module, indicate and give UE this selected frequency allocation as selected frequency range according to the frequency range of these UE needs; And the notice memory module is upgraded the resource management record.
In one embodiment of the invention, described interference suppresses the unit and further comprises: resource units RU control module, wherein,
Described resource control module is further determined the RU number of these UE needs according to the type of service of UE, RU number and selected band information that UE is needed send to the RU control module, reception comes from the selected RU information of RU control module, selected RU information in the selected frequency range that receives is sent to communication module in the base station, and indicate selected RU is distributed to UE;
Described memory module is further used for preserving the RU precedence information of each frequency range;
Described RU control module is that RU in each frequency range distributes priority according to UE to the occupancy of RU, and the RU precedence information that is distributed is sent to memory module; Reception comes from the RU number of the selected band information and the UE needs of resource distribution module, from memory module, read the RU precedence information of selected frequency range, begin to select from the highest RU of the priority of selected frequency range, determine selected RU, and selected RU information is sent to resource distribution module.
Preferably, described RU control module is further used for the priority of selected RU is reduced to minimum, the priority of other RU of selected frequency range is improved, and the priority of the RU of the selected frequency range after will changing sends to described memory module;
Described memory module is further used for receiving the precedence information of the RU after the change that comes from the RU control module, and the RU precedence information of being preserved is upgraded.
Preferably, described communication module is further used for knowing that UE discharges RU, and d/d RU information is sent to the RU control module by described resource distribution module;
Described RU control module is further used for receiving d/d RU information, and according to the situation that takies of the RU adjacent with this d/d RU, with the priority raising of d/d RU, and the RU precedence information after will improving sends to memory module;
Described memory module is further used for receiving the RU precedence information after the raising that comes from the RU control module, and the RU precedence information of being preserved is upgraded.
The present invention provides a kind of system that is used to suppress presence of intercell interference again, can reduce the complicated operation degree of presence of intercell interference process of inhibition.In this system, comprising: radio network controller (RNC) and base station, wherein,
Described RNC determines the available downlink resource of each sub-district, and is notified to corresponding base station;
Described base station receives the available downlink resource of this sub-district, place, base station that comes from described RNC, determining need be for user equipment (UE) allocation of downlink resource the time, type of service according to this UE is determined frequency range, and according to determined frequency range, from described available downlink resource, select the frequency range do not taken, as selected frequency range and distribute to this UE by neighbor cell.
Specifically, described RNC comprises: frequency range administration module and communication module, wherein,
Described frequency range administration module is each frequency allocation priority at the sub-district of described RNC administration, and the corresponding frequency band of neighbor cell has different priority, and the frequency range precedence information of each sub-district is sent to communication module among the RNC;
Described communication module receives the frequency range precedence information of each sub-district that comes from the frequency range administration module, and sends to the base station in the respective cell.
Use the present invention, can reduce the complicated operation degree that presence of intercell interference suppresses.Particularly, the present invention has following beneficial effect:
1. give the UE that needs downlink resource by the frequency allocation that will be taken by neighbor cell among the present invention, a plurality of UE that avoid being in neighbor cell take the frequency range of coincidence and bring the situation of frequency crossover, thereby realize inter-cell interference suppression; This method need not any extra coding and calculating operation in the process of implementation, and it is compared with existing presence of intercell interference inhibition scheme, and the complicated operation degree reduces greatly, and can reduce the burden of transmitting terminal and receiving terminal in the OFDM transmission effectively.
2. in an embodiment of the present invention, according to the probability that is successfully taken by UE, for the corresponding frequency band of neighbor cell is distributed different priority, and begin to select selected frequency range from the higher frequency range of priority, thereby the frequency range that do not taken by neighbor cell can be determined in the base station, the effect that suppresses presence of intercell interference is better, but and operational degree also better.
3. in another embodiment of the present invention, be that each RU of each frequency range distributes priority according to UE to the occupancy of RU, after having determined selected frequency range, the highest RU of priority that the base station also is subordinated to selected frequency range begins to select, and determines selected RU, distributes to UE; Then the priority of selected RU is reduced to minimum and the priority of other RU of selected frequency range is improved, come RU priority is upgraded.Like this, when other UE need downlink resource, still select from the highest RU of priority, thereby further reduce a plurality of UE of being in identical or the neighbor cell, improve the signal transmission quality in the ofdm system because of using the possibility of the RU phase mutual interference of facing mutually.
Description of drawings
To make clearer above-mentioned and other feature and advantage of the present invention of those of ordinary skill in the art by describe exemplary embodiment of the present invention in detail with reference to accompanying drawing below, in the accompanying drawing:
Fig. 1 is the resource allocation schematic diagram of each cellular cell in the existing ofdm system.
Fig. 2 is the exemplary process diagram of inter-cell interference restraint method of the present invention;
The wide priority assignment schematic diagram of wideband when the whole frequency ranges of Fig. 3 are 0～20MHz;
Fig. 4 is the flow chart of inter-cell interference restraint method in the embodiment of the invention 1;
Fig. 5 is the schematic diagram of RU priority assignment in the embodiment of the invention 2;
Fig. 6 is the method flow diagram that presence of intercell interference suppresses in the embodiment of the invention 2;
Fig. 7 is the structural representation of the system that is used to suppress presence of intercell interference in the embodiment of the invention.
Embodiment
For making purpose of the present invention, technical scheme clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
The invention provides a kind of inter-cell interference suppression method, its basic thought is when the UE allocation of downlink resource, never selects in the frequency range that is taken by the neighbor cell of this sub-district, UE place, and gives this UE with selected frequency allocation.
Fig. 2 shows the exemplary process diagram of inter-cell interference restraint method among the present invention.Referring to Fig. 2, this method may further comprise the steps:
In step 201, determining to determine frequency range according to the type of service of this UE need be for UE allocation of downlink resource the time;
In step 202, according to determined frequency range, from the available downlink resource of this sub-district, UE place, the frequency range of selecting not to be taken by neighbor cell is distributed to this UE as selected frequency range.
By above-mentioned two steps as seen, give the UE that needs downlink resource by the frequency allocation that will do not taken among the present invention by neighbor cell, the a plurality of UE that avoid being in neighbor cell take the frequency range of coincidence and bring the situation of frequency crossover, thereby realize inter-cell interference suppression; This method need not any extra coding and calculating operation in the process of implementation, and it is compared with existing presence of intercell interference inhibition scheme, and the complicated operation degree reduces greatly, and the burden of transmitting terminal and receiving terminal is also less.
The present invention can realize determining of selected frequency range by distribute the mode of different priority for the corresponding frequency band of neighbor cell.And can carry out at each sub-district in the network equipment such as RNC be the operation of each frequency allocation priority, then sub-district Mid Frequency precedence information is kept in the corresponding base station, so that be UE allocation of downlink resource again.Below by two embodiment the area interference inhibition scheme among the present invention is elaborated.
In the present embodiment, network side is each frequency allocation priority at each sub-district in advance, and the foundation of distributing is: the corresponding frequency band of neighbor cell has different priority.
In ofdm system, frequency range is divided into two types usually: the wide and narrow frequency range of wideband.Wherein, 20MHz, 15MHz, 10MHz and 5MHz etc. are that wideband is wide; 2.5MHz, 1.6MHz and 1.25MHz be narrow frequency range.Present embodiment is when distributing priority, be unit at first with every kind of frequency range, whole frequency ranges are divided into one or more frequency range, then be each frequency allocation priority of various frequency range correspondences, and the corresponding frequency band of neighbor cell have different priority.
The wide priority assignment schematic diagram of wideband when Fig. 3 shows whole frequency ranges and is 0～20MHz.Referring to Fig. 3, when the frequency range of UE needs is 20MHz, because whole frequency ranges only has 20MHz, therefore, the priority of frequency range 0～20MHz is 1, if the UE in the neighbor cell has taken this frequency range fully, the base station in this sub-district just can't provide the downlink resource of less presence of intercell interference for UE so; When the frequency range of UE needs was 10MHz, the priority of frequency range 0～10MHz was 1, and the priority of frequency range 10MHz～20MHz is 2; When the frequency range of UE needs was 5MHz, the priority of frequency range 0～5MHz was 2, and the priority of frequency range 5MHz～10MHz is 3, and the priority of frequency range 10～15MHz is 1, and the priority of frequency range 15MHz～20MHz is 2; When the frequency range of UE needs is 2.5MHz, 1.6MHz and 1.25MHz,, be each frequency allocation priority according to mode same as described above.In the present embodiment, the less frequency range of priority numeral has higher priority, and uses the possibility of UE frequency of occurrences crossover of the UE of this frequency range and neighbor cell less.
Fig. 3 only is the schematic diagram of a sub-district Mid Frequency priority assignment, for the neighbor cell of this sub-district, and the priority difference of corresponding frequency band.For example, when the frequency range of UE needs was 5MHz, the priority of frequency range 0～5MHz was 1, and the priority of frequency range 5MHz～10MHz is 2, and the priority of frequency range 10～15MHz is 2, and the priority of frequency range 15MHz～20MHz is 3.And for the another one neighbor cell of this sub-district, when the frequency range that needs as UE was 5MHz, the priority of frequency range 0～5MHz was 3, and the priority of frequency range 5MHz～10MHz is 3, and the priority of frequency range 10～15MHz is 2, and the priority of frequency range 15MHz～20MHz is 1.In other words, the priority assignment pattern difference between per two neighbor cells.
Need to prove, finish the distribution of priority by RNC by each sub-district being carried out the macroscopic view balance herein, and determine the allocative decision of priority at RNC after, again the frequency range precedence information of each sub-district is handed down to the base station of this sub-district.
Fig. 4 shows in the embodiment of the invention flow chart based on the area interference inhibition method of above-mentioned priority allocation scheme.Referring to Fig. 4, this method comprises:
In step 401～402, the base station is determined and need according to the type of service of UE, be determined the frequency range that this UE needs for UE allocation of downlink resource.
Here, receive the resource allocation request that comes from UE or base station when detecting UE and being linked into situation such as network when the base station occurring, the base station is determined to be UE allocation of downlink resource.Then, the type of service that UE is current is write down to determine according to the UE business information of self preserving in the base station, so that determine to distribute in the subsequent step frequency range width of UE, i.e. frequency range.For example, the customized type of service of UE is speech business, and the frequency range that needs is 2.5MHz.
In step 403, the current available downlink resource of sub-district, UE place is determined in the base station.
In wireless communication system, can there be a plurality of UE that communication requirement is arranged in each sub-district, and each UE can take certain downlink resource, and because the total amount of downlink resource is limited, therefore in this step the base station according to its other resources management accounts, definite downlink resource that is not taken fully by other UE in this sub-district uses for this UE.For example, the current available downlink resource of sub-district, UE place is the frequency range of 5MHz～20MHz.It is pointed out that in ofdm system, all frequencies in the frequency range that is meant this downlink resource correspondence of taking fully of downlink resource all have been assigned with and finish; Correspondingly, when having not the frequency that is taken by UE in certain frequency range, this frequency range still can be considered the available downlink resource of UE.
In step 404～405, the frequency range that frequency range is corresponding and priority is the highest that the base station need with this UE to be selected from current available downlink resource is as selected frequency range, and should selected frequency allocation to UE.
Be example still in the priority assignment mode among Fig. 3, the current available downlink resource of sub-district, UE place is the frequency range of 5MHz～20MHz, the frequency range that UE needs is 2.5MHz, at first search the frequency range corresponding priorities information that UE needs so herein in Fig. 3, promptly the longitudinal axis is the priority of each frequency range of 2.5MHz correspondence; Then, in current available downlink resource, select the highest frequency range of priority, promptly in the frequency range of 5MHz～20MHz, select.Among Fig. 3 in the 2.5MHz corresponding priorities information, the priority of 15MHz～17.5M1z and two frequency ranges of 17.5MHz～20MHz is 1, show that these two frequency ranges all can not bring presence of intercell interference to UE, therefrom optional frequency range in base station so is as selected frequency range.
So far, finish the flow process that presence of intercell interference suppresses in the present embodiment.
From foregoing description as seen and since in the present embodiment network side in advance at each sub-district priority that be each frequency allocation, promptly for neighbor cell, the identical different frequency range of priority correspondence; And when being the UE Resources allocation, each sub-district all is to select frequency range according to identical priority orders, therefore, even during the corresponding same frequency range of the different UEs in the neighbor cell, also therefore situation that can frequency of occurrences crossover can suppress the generation of presence of intercell interference effectively.Simultaneously, the operations such as frequency range that this method only need be carried out the configuration of priority and select limit priority in available downlink resource, design is simple, and it is convenient to carry out, and the complicated operation degree reduces greatly.
It is the operation that RU in the frequency range distributes priority to the occupancy of RU that present embodiment has increased according to UE on the basis of embodiment 1, so that reduce because of a plurality of UE in identical or the neighbor cell select to face the interference that RU produces mutually, thereby further improve the transmission quality of ofdm signal.
In the ofdm system, each frequency range all is divided into a plurality of RU, and each RU includes M subcarrier, and wherein M is more than or equal to 1.For example, every 375KHz is a RU, then has 53 RU in the frequency range of 20MHz.Be each RU distribution priority in each frequency range in advance in the present embodiment.In addition, when RU was assigned to UE, UE access network and UE release RU, the priority of RU was upgraded in the base station.
Fig. 5 shows the schematic diagram of RU priority assignment in the present embodiment.Referring to Fig. 5, each frequency range is divided into several RU in the frequency range of 0～20MHz, for example: RU1, RU2, RU3 to RUN, their priority be respectively priority 2, priority 1, priority 2 ..., priority 3.
Fig. 6 shows the method flow diagram that presence of intercell interference suppresses in the present embodiment.Before the flow performing in Fig. 6, present embodiment also adopts the mode identical with embodiment 1, is that the corresponding frequency band of neighbor cell is distributed different priority.Then, carry out following each step:
In step 601～602, determine that the base station determines according to the type of service of UE, to determine frequency range and RU number that this UE needs for UE allocation of downlink resource.
Here with embodiment 1 in the difference of step 401～402 be, when determining the frequency range that UE needs, also determine the RU number of these UE needs in the present embodiment according to type of service.
In step 603～604, the current available downlink resource of sub-district, UE place is determined in the base station; And the frequency range of need with this UE selecting from current available downlink resource that frequency range is corresponding and priority is the highest is as selected frequency range.
The operation of step 403～404 among the operation of two steps herein and the embodiment 1 is identical.
In step 605～606, the base station begins to select from the highest RU of selected frequency range medium priority according to the RU number of these UE needs, determines selected RU.
Here, when RU has higher priority, show that this RU is higher by the probability that the UE in the sub-district successfully takies, for example this RU is unoccupied and RU around it is not taken by other UE yet; When the priority of RU was hanged down, showing can be lower with the probability of thinking the UE service, and for example occupied or adjacent with this RU RU of this RU is taken by other UE.
Begin to select from the highest RU of priority in this step, can avoid effectively other UE have been taken or the occupied RU of adjacent R U distributes to the UE that needs downlink resource herein, thereby can reduce in identical or the neighbor cell each UE because of taking the interference that adjacent RU brings.With the situation among Fig. 5 is example, if the RU number that UE needs is 2, then the base station begins to select from the highest RU of priority, and promptly RU2 finds out two available RU in turn, and then with two selected available RU as selected RU, use for UE.Because the RU1 here and the priority of RU3 are 2, then the base station is from these two RU optional one, together with RU2 as selected RU.
In step 606, the selected RU in the selected frequency range is distributed to UE, the priority of selected RU is reduced to minimum, and the priority of other RU of selected frequency range improved.
In this step,, come RU priority is upgraded by the priority of selected RU being reduced to minimum and the priority of other RU of selected frequency range being raise.Here the distance on frequency is determined the progression that raises according to other RU and selected RU, and promptly distance is far away more, and the progression of rising is big more.So, when other UE need downlink resource, still select from the highest RU of priority, thereby avoid being in a plurality of UE in identical or the neighbor cell because of using adjacent RU phase mutual interference, and the interference of using the UE of the RU that is in cell edge to be subjected to also can reduce.And after RU priority was updated, the new priority of the RU that the base station will be taken by UE was notified to corresponding UE.
In addition, after the base station knew that UE has discharged the RU of its use, the base station was according to the situation that takies of the RU adjacent with this RU, with the priority raising of this d/d RU.
So far, the presence of intercell interference that finishes in the present embodiment suppresses flow process.
Not only can be the same in the present embodiment with embodiment 1, suppress presence of intercell interference by shirtsleeve operation, but also can be by being RU configuration preference level and upgrading and further avoid the interference between a plurality of UE in identical or the neighbor cell.
For the above embodiments 1 and embodiment 2, also can take another kind of mode is each frequency allocation priority.Particularly, the frequency range that the priority numeral is bigger has higher priority.So, when selecting the highest frequency range of priority in the step 404 and 604, begin to select from the maximum frequency range of priority numeral as selected frequency range.Similarly, when distributing priority for RU, also can be so that the bigger corresponding higher priority of RU of priority number word.
In order to guarantee carrying out smoothly of said method, the present invention also provides the system that is used to suppress presence of intercell interference.Fig. 7 shows the structural representation of the system that is used to suppress presence of intercell interference in the embodiment of the invention.Referring to Fig. 7, this system comprises: RNC and base station.Wherein, RNC is used for determining the available downlink resource of each sub-district, and is notified to corresponding base station.The base station is used to receive the available downlink resource of this sub-district, place, base station that comes from RNC, determining need be for user equipment (UE) allocation of downlink resource the time, type of service according to this UE is determined frequency range, and according to determined frequency range, from this available downlink resource, select the frequency range do not taken, as selected frequency range and distribute to this UE by neighbor cell.
More specifically, comprise frequency range administration module and communication module among the RNC.Wherein, the frequency range administration module is each frequency allocation priority at the sub-district of being administered, and the corresponding frequency band of neighbor cell has different priority, and the frequency range precedence information of each sub-district is sent to communication module among the RNC; Communication module among the RNC receives the frequency range precedence information of each sub-district that comes from the frequency range administration module, and sends to the base station in the respective cell.
The base station comprises communication module, memory module and resource distribution module.Wherein, communication module is used to receive the frequency range precedence information of this base station respective cell that comes from RNC, and the frequency range precedence information that receives is sent to memory module; Reception comes from the selected band information of resource distribution module, and this selected band information is sent to the UE that needs downlink resource.Memory module receives and comes from the frequency range precedence information of communication module, and preserves, and preserves the business information record of each UE and the resource management record of base station, and upgrades the resource management record under the indication of resource distribution module.Resource distribution module is determined to be UE allocation of downlink resource, reads the type of service of this UE from memory module, determines the frequency range of these UE needs according to the type of service that reads; From memory module, read the resource management record, determine the current available downlink resource of sub-district, UE place; From memory module, read the frequency range precedence information,, from current available downlink resource, select the highest frequency range of priority, selected band information is sent to communication module, indicate and give UE this selected frequency allocation as selected frequency range according to the frequency range of these UE needs; And the notice memory module is upgraded the resource management record.
Further, when adopting the scheme of embodiment 2, also comprise the RU control module in the base station.At this moment, the resource control module is also determined the RU number of these UE needs according to the type of service of UE, RU number and selected band information that UE is needed send to the RU control module, reception comes from the selected RU information of RU control module, selected RU information in the selected frequency range that receives is sent to communication module in the base station, and indicate selected RU is distributed to UE.Memory module is further used for preserving the RU precedence information of each frequency range, receives the precedence information of the RU after the change come from the RU control module, and the RU precedence information of being preserved is upgraded.The RU control module is that RU in each frequency range distributes priority according to UE to the occupancy of RU, and the RU precedence information that is distributed is sent to memory module; Reception comes from the RU number of the selected band information and the UE needs of resource distribution module, from memory module, read the RU precedence information of selected frequency range, begin to select from the highest RU of the priority of selected frequency range, determine selected RU, and selected RU information is sent to resource distribution module; The priority of selected RU is reduced to minimum, and the priority of other RU of selected frequency range improved, and the precedence information of the RU of the selected frequency range after will changing sends to memory module.
In addition, the communication module in the base station can also know that UE discharges RU, will be sent to the RU control module by resource distribution module by the RU information that UE discharges; The RU control module is according to the situation that takies of the RU adjacent with d/d RU, and with the priority raising of d/d RU, and the RU precedence information after will improving sends to memory module; Correspondingly, memory module receives the RU precedence information after improving, and the RU precedence information of being preserved is upgraded.
Certainly, in the application of reality, the communication module in the above-mentioned base station, memory module, resource distribution module and RU control module can be integrated in by name an interference in the entity that suppresses the unit.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. an inter-cell interference restraint method is characterized in that, this method comprises:
A. determining to determine frequency range according to the type of service of this UE need be for user equipment (UE) allocation of downlink resource the time;
B. according to determined frequency range, from the available downlink resource of this sub-district, UE place, the frequency range of selecting not to be taken by neighbor cell is distributed to this UE as selected frequency range.
2. the method for claim 1, it is characterized in that, be each frequency allocation priority at each sub-district in advance, and the corresponding frequency band of neighbor cell has different priority, then step B is described according to determined frequency range, from the available downlink resource of this sub-district, UE place, the frequency range of selecting not taken by neighbor cell comprises as selected frequency range:
B1. the current frequency range that is not taken fully by other UE in the sub-district, described UE place is determined, as described available downlink resource according to the resource management record of self preserving in the base station;
B2. base station the frequency range that frequency range is corresponding and priority is the highest that need with described UE to select from described available downlink resource is as selected frequency range.
3. method as claimed in claim 1 or 2 is characterized in that, further comprises before the described steps A: for each the resource units RU in each frequency range distributes priority;
Further comprise before the described step B: the RU number of determining these UE needs according to the type of service of described UE;
The frequency range that the described selection of step B is not taken by neighbor cell is as after the selected frequency range, further comprise: the base station is according to the RU number of described UE needs, begin to select from the highest RU of selected frequency range medium priority, determine selected RU, carry out the operation of the described UE of distributing to then.
4. method as claimed in claim 3 is characterized in that, describedly determines further to comprise after the selected RU: the priority of described selected RU is reduced to minimum, and with the priority raising of other RU of described selected frequency range.
5. method as claimed in claim 3 is characterized in that, this method further comprises: when the base station knows that UE discharges employed RU, with the priority raising of d/d RU.
6. base station, it is characterized in that, this base station comprises disturbs the inhibition unit, this unit receives the available downlink resource that comes from this outside sub-district, place, base station, is determining to determine frequency range according to the type of service of this UE need be for user equipment (UE) allocation of downlink resource the time, and according to determined frequency range, from described available downlink resource, the frequency range of selecting not to be taken by neighbor cell is as selected frequency range, and distributes to this UE.
7. base station as claimed in claim 6 is characterized in that, described interference suppresses the unit and comprises: communication module, memory module and resource distribution module, wherein,
Described communication module receives the frequency range precedence information that comes from this outside base station respective cell, and the frequency range precedence information that receives is sent to memory module; Reception comes from the selected band information of resource distribution module, and this selected band information is sent to the UE that needs downlink resource;
Described memory module reception comes from the frequency range precedence information of communication module and preserves, and preserves the business information record of each UE and the resource management record of base station, and upgrades the resource management record under the indication of resource distribution module;
Described resource distribution module is determined to be UE allocation of downlink resource, reads the type of service of this UE from memory module, determines the frequency range of these UE needs according to the type of service that reads; From memory module, read the resource management record, determine the current available downlink resource of sub-district, UE place; From memory module, read the frequency range precedence information,, from current available downlink resource, select the highest frequency range of priority, selected band information is sent to communication module, indicate and give UE this selected frequency allocation as selected frequency range according to the frequency range of these UE needs; And the notice memory module is upgraded the resource management record.
8. base station as claimed in claim 7 is characterized in that, described interference suppresses the unit and further comprises: resource units RU control module, wherein,
Described resource control module is further determined the RU number of these UE needs according to the type of service of UE, RU number and selected band information that UE is needed send to the RU control module, reception comes from the selected RU information of RU control module, selected RU information in the selected frequency range that receives is sent to communication module in the base station, and indicate selected RU is distributed to UE;
Described memory module is further used for preserving the RU precedence information of each frequency range;
Described RU control module is that RU in each frequency range distributes priority according to UE to the occupancy of RU, and the RU precedence information that is distributed is sent to memory module; Reception comes from the RU number of the selected band information and the UE needs of resource distribution module, from memory module, read the RU precedence information of selected frequency range, begin to select from the highest RU of the priority of selected frequency range, determine selected RU, and selected RU information is sent to resource distribution module.
9. base station as claimed in claim 8, it is characterized in that, described RU control module is further used for the priority of selected RU is reduced to minimum, the priority of other RU of selected frequency range is improved, and the priority of the RU of the selected frequency range after will changing sends to described memory module;
Described memory module is further used for receiving the precedence information of the RU after the change that comes from the RU control module, and the RU precedence information of being preserved is upgraded.
10. base station as claimed in claim 8 or 9 is characterized in that, described communication module is further used for knowing that UE discharges RU, and d/d RU information is sent to the RU control module by described resource distribution module;
Described RU control module is further used for receiving d/d RU information, and according to the situation that takies of the RU adjacent with this d/d RU, with the priority raising of d/d RU, and the RU precedence information after will improving sends to memory module;
Described memory module is further used for receiving the RU precedence information after the raising that comes from the RU control module, and the RU precedence information of being preserved is upgraded.
11. a system that is used to suppress presence of intercell interference is characterized in that, this system comprises: radio network controller (RNC) and base station, wherein,
Described RNC determines the available downlink resource of each sub-district, and is notified to corresponding base station;
Described base station receives the available downlink resource of this sub-district, place, base station that comes from described RNC, determining need be for user equipment (UE) allocation of downlink resource the time, type of service according to this UE is determined frequency range, and according to determined frequency range, from described available downlink resource, select the frequency range do not taken, as selected frequency range and distribute to this UE by neighbor cell.
12. system as claimed in claim 11 is characterized in that, described RNC comprises: frequency range administration module and communication module, wherein,
Described frequency range administration module is each frequency allocation priority at the sub-district of described RNC administration, and the corresponding frequency band of neighbor cell has different priority, and the frequency range precedence information of each sub-district is sent to communication module among the RNC;
Described communication module receives the frequency range precedence information of each sub-district that comes from the frequency range administration module, and sends to the base station in the respective cell.
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