CN101064905A - Wireless system frequency resources distribution method, equipment and wireless communication system - Google Patents
Wireless system frequency resources distribution method, equipment and wireless communication system Download PDFInfo
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- CN101064905A CN101064905A CNA2006100789643A CN200610078964A CN101064905A CN 101064905 A CN101064905 A CN 101064905A CN A2006100789643 A CNA2006100789643 A CN A2006100789643A CN 200610078964 A CN200610078964 A CN 200610078964A CN 101064905 A CN101064905 A CN 101064905A
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Abstract
The invention discloses a distribution method for frequency source of wireless system which includes: every section reports the information that indicates the load state or the needed frequency source periodically; it decides the needed frequency source according to the reported information from sections, and judges the needed frequency source is bigger than the fixed frequency source which belongs to the section, if yes, the spare frequency source of adjacent sections is distributed for the section. The invention also provides the corresponding frequency source distribution device and wireless communication system. The invention can adjust the main frequency source that occupied by the boundary users according to the different load requirement of sections, it can avoid the disturbance between the section and improve the throughput of section boundary.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of wireless system frequency resource allocation method and corresponding equipment and wireless communication system.
Background technology
Present stage, in international wireless communication standards The Research of Relevant Technology, OFDM (Orthogonal Frequency Division Multiplexing based on multicarrier, OFDM) technology receives increasing concern, at 3GPP Long Term Evolution (Long Time Evolution, LTE) in the standard process, determined the OFDM technology is added in the 3GPP-EUTRA standard as enhancement techniques.In descending link, adopt OFDM to insert (OFDMA) technology, its basic thought is the narrowband subchannels that the running time-frequency resource of wireless communication system is divided into some quadratures in frequency domain, and high-speed data-flow is by serial/parallel conversion parallel transmission on each subchannel.Because the narrow-band characteristic of subchannel can overcome multi-path influence, keep the orthogonality between the subchannel, thereby guaranteed that the interference between the internal user of sub-district is very little.In up link, adopt single carrier frequency division multiplexing (SC-FDMA) technology, different subcarrier on the different CU frequencies.Therefore, the uplink and downlink link can be by the coordination of inter-cell frequency resources, to avoid the interference between the sub-district.
The orthogonal frequency division multiplexi advantage is to guarantee that between the signal of sub-district internal user be quadrature, avoid the interference between the internal user of sub-district, but the interference between the sub-district still exists, as is in the user of cell boarder, may be subjected to the interference of the signal of neighbor cell transmission.Some methods that solve presence of intercell interference are to carry out interference coordination (Interference Co-ordination), to avoid the appearance of presence of intercell interference.Propose to divide the user who is in cell boarder that different districts is given in the different frequency resource allocation among the 3GPPR1-050507, the interference that has realized being between the user of cell boarder is less.Be called the basic frequency of this sub-district for the frequency that preferentially is used for boundary user of each sub-district specific assigned, remaining frequency is called secondary frequencies.The boundary user of neighbor cell uses different basic frequencies to avoid presence of intercell interference, realizes frequency re-use factor greater than 1, and secondary frequencies can be distributed to Cell Center User and use, and frequency re-use factor is 1.Basic frequency is used different big or small transmitting power thresholdings with secondary frequencies, and the transmitting power thresholding that is generally the basic frequency setting is higher than secondary frequencies, to reduce presence of intercell interference.
At present, the LTE standard process also is in conceptual phase, just the scheme of various Inter-Cell Interference Coordination in the cards is all listed, and assesses to determine the performance of various schemes to carry out emulation.But concrete static or semi-static resource coordination scheme is not also determined.
In the prior art, be divided into interference coordination technique static and semi-static dual mode is assessed.Static mode is given different sub-districts for distributing the fixed frequency resource, the frequency resource of distributing to each sub-district remains unchanged in a long time, the time cycle that keeps is one day or several days, guarantees that the neighbor cell boundary user uses the frequency resource of mutually orthogonal, to avoid presence of intercell interference.Soft-frequency reuse scheme according to 3GPP R1-050507 proposition, when the frequency re-use factor of each cell boarder is 3, concrete resource distribution mode can for, distribute the boundary user of adjacent 3 sub-districts to take each self-orthogonal 1/3 fixing frequency resource is given each sub-district as basic frequency resource priority allocation boundary user.
The method that this static frequency is coordinated is simple, also avoided presence of intercell interference effectively, but under some particular case, for example the neighbor cell boundary user is a lot of or cell boarder when having the peak value rate requirement, owing to distribute to the basic frequency resource-constrained of cell boundary users, can't satisfy the demand of these higher load of carrying; On the other hand, for the less sub-district of those cell boarder loading demands, its basic frequency resource utilization is not high, so that its basic frequency wasting of resources.Therefore, on this basis, propose semi-static frequency coordination and solve this problem.
Semi-static mode considers that more factors adjusts the basic frequency resource that each cell boundary users takies, and as the loading condition according to the sub-district, this sub-district is subjected to the situation of neighbor cell interference level etc.When considering the situation of cell load, to distribute to the frequency resource of each sub-district and in the relatively short time, adjusting according to the different loading condition in each sub-district, the time cycle of adjustment is one second, several seconds, one minute, a few minutes or longer time.As the cell boarder loading demand when big, distribute more basic frequency resource then for this cell boundary users, otherwise, less than the less sub-district of loading demand, then distribute less basic frequency resource, to adapt to the different demands of different districts loading condition, improve the spectrum efficiency of cell boarder, improve the systematic function of cell boarder simultaneously.
Summary of the invention
The invention provides a kind of concrete wireless system frequency resource allocation method, realize avoiding presence of intercell interference and effectively utilizing frequency spectrum resource, improve the systematic function of cell boarder simultaneously, and satisfy the different border loading demand of different districts.
The inventive method comprises:
The information of A, each sub-district periodic report indication self load condition or required frequency resource;
B, the information that reports according to each sub-district are determined the required frequency resource in each sub-district, whether judge the required frequency resource in each sub-district greater than the fixed frequency resource that is allocated to the sub-district, if then give this sub-district with the idle frequence resource allocation of neighbor cell.
Described step B comprises:
Distribute described fixed frequency resource to give each sub-district;
Relatively required frequency resource in sub-district and described fixed frequency resource size when the required frequency resource in sub-district during smaller or equal to described fixed frequency resource, only take required frequency resource; Unappropriated residual frequency resource is designated as the idle frequence resource;
When the required frequency resource in sub-district during, take whole fixed frequency resources of distribution, and the idle frequence resource of neighbor cell is redistributed to this sub-district greater than described fixed frequency resource.
Described step B comprises:
Relatively required frequency resource in sub-district and described fixed frequency resource size when the required frequency resource in sub-district during smaller or equal to described fixed frequency resource, only distribute required frequency resource to give this sub-district; Unappropriated residual frequency resource is designated as the idle frequence resource;
When the required frequency resource in sub-district during, distribute described fixed frequency resource to give this sub-district, and give this sub-district the idle frequence resource allocation of neighbor cell greater than described fixed frequency resource.
The execution entity of described step B is high-rise Centroid or controller.
Described controller is positioned at high-rise Centroid or cell base station.
The frequency resource of described distribution is the basic frequency resource, and the transmitting power thresholding of its setting is higher than other frequency resource.
According to said method of the present invention, whole in the network are distinguished into some groups for a short time, make each sub-district in every group non-conterminous mutually; System frequency resource is divided into mutually on the same group by the frequency size order, with every class frequency resource as unique each sub-district that is allocated in the cell set of described fixed frequency resource.
According to said method of the present invention, further every class frequency resource is divided into several frequency subbands;
In the described steps A, each sub-district calculates required frequency subband number according to self load condition;
Among the described step B, compare the subband number that required frequency subband number in each sub-district and described fixed frequency resource comprise, when subband number that required frequency subband number comprises smaller or equal to described fixed frequency resource, this community user only takies its required frequency subband number; Write down the unappropriated idle subband number in this sub-district;
When subband number that the required subband number of cell boundary users comprises greater than described fixed frequency resource, this cell boundary users takies whole subbands that described fixed frequency resource comprises, identifying this sub-district is the resource requirement sub-district, calculates the subband number that it needs additional allocation; And in the neighbor cell of described resource requirement sub-district, need the subband number of additional allocation to distribute the respective free subband to give this resource requirement sub-district by this resource requirement sub-district.
According to said method of the present invention, before giving the idle subband of described resource requirement cell allocation, also comprise:
Add up described resource requirement sub-district number;
When having two or more described resource requirement sub-districts, need the subband number of additional allocation to sort by it each resource requirement sub-district, the preferential more described resource requirement sub-district of subband number that need to select additional allocation is for it distributes idle subband.
According to said method of the present invention, also comprising behind the idle subband for described resource requirement cell allocation:
Upgrade the occupation condition in described resource requirement sub-district and the neighbor cell;
Travel through whole resource requirements sub-district.
According to said method of the present invention, the subband that the fixed frequency resource that is allocated to each sub-district is comprised sorts by the frequency size;
Community user takies frequency subband by ascending order/descending by the number of its required frequency subband; The idle subband of neighbor cell is pressed descending/ascending order arrange, and its idle subband is distributed to the resource requirement sub-district by the subband number that the resource requirement sub-district needs by putting in order.
According to said method of the present invention, for the concrete grammar of the idle subband of described resource requirement cell allocation is:
Select a neighbor cell group adjacent with described resource requirement sub-district;
Judge whether whole neighbor cells adjacent with described resource requirement sub-district in this cell set have public idle subband to satisfy the subband number of this required additional allocation in resource requirement sub-district; If then in public idle subband, need the subband number of additional allocation to distribute to this resource requirement sub-district this resource requirement sub-district.
According to said method of the present invention, also comprise the priority orders that described neighbor cell group is set; Judge successively by the priority orders that is provided with whether described public idle subband is arranged in each neighbor cell group.
According to said method of the present invention, when whole neighbor cell groups judgements finish, when not having described public idle subband to satisfy the subband number of this required additional allocation in resource requirement sub-district, according to the priority of neighbor cell group from high to low order and every group in the idle sub band number of each neighbor cell order from small to large, judge successively whether the idle subband in each neighbor cell satisfies the subband number of this required additional allocation in resource requirement sub-district;
After matching the neighbor cell that satisfies condition, need the subband number of additional allocation to distribute to this resource requirement sub-district by this resource requirement sub-district its idle subband.
If there is not to match the neighbor cell that satisfies condition, then maximum idle sub band number in the neighbor cell group is distributed to described resource requirement sub-district.
According to said method of the present invention, comprise that also inside, sub-district carries out the step of frequency resource scheduling.
Inside, described sub-district is carried out the frequency resource scheduling and is included but not limited to:
Equitable proportion PF scheduling mode, polling dispatching mode, maximum throughput rate scheduling mode or maximum-least resource scheduling mode.
Described PF scheduling comprises:
Basic frequency and secondary frequencies are carried out the PF scheduling respectively; Specifically comprise:
Earlier by PF value size order ordering the carry out resource allocation of each boundary user on basic frequency; When the frequency resource of this cell boundary users demand during, sort by the PF value size order of each central user on remaining basic frequency and to carry out resource allocation less than the basic frequency of distributing; Again by PF value size order ordering the carry out resource allocation of each central user on secondary frequencies;
When the frequency resource of this cell boundary users demand during, sort by the PF value size order of each boundary user on basic frequency and to carry out resource allocation more than or equal to the basic frequency of distributing; The residue boundary user and the central user that are not assigned to the basic frequency resource are carried out the PF scheduling on secondary frequencies.
Described residue boundary user and central user are carried out the PF scheduling on secondary frequencies, comprising:
With the PF of the shared basic frequency of described residue boundary user on duty with one greater than 1 weight coefficient;
Press PF value size described residue boundary user of ordering and central user, carry out the secondary frequencies resource allocation successively.
Described PF scheduling also comprises:
The sub-district secondary frequencies that sub-district basic frequency that boundary user is taken and central user take adopts unified PF scheduling;
The basic frequency that boundary user is taken and the PF value of secondary frequencies all multiply by one greater than 1 weight coefficient;
Press PF value size each boundary user of ordering and central user, carry out basic frequency resource and secondary frequencies resource allocation successively.
The present invention provides a kind of frequency resource allocation equipment in addition, comprising:
First functional unit receives the indication self load condition of each sub-district periodic report or the information of required frequency resource;
Second functional unit is determined the required frequency resource in each sub-district according to the information that each sub-district reports, and relatively each sub-district required frequency resource that reports and fixed frequency resource size that is allocated to the sub-district, and output comparative result is given the 3rd functional unit;
The 3rd functional unit when comparative result when being the required frequency resource in sub-district smaller or equal to described fixed frequency resource, only distributes required frequency resource to give this sub-district; Unappropriated residual frequency resource is designated as the idle frequence resource;
When comparative result when being the required frequency resource in sub-district, distribute described fixed frequency resource to give this sub-district, and give this sub-district the idle frequence resource allocation of neighbor cell greater than described fixed frequency resource.
The present invention also provides a kind of wireless communication system, comprises several sub-districts and receives user terminal, also includes said frequencies resource allocation apparatus provided by the invention.
Described frequency resource allocation equipment is the independent physical entity that is provided with, and is connected with each cell base station by external interface; Perhaps, described frequency resource allocation equipment is logic entity, is integrated in the top management node in the system.
Described wireless communication system is an ofdm system.
Described wireless communication system is uplink communication chain-circuit system or downlink communication chain-circuit system.
Beneficial effect of the present invention is as follows:
(1) the invention provides a kind of concrete enforceable wireless system frequency resource allocation method, in conjunction with static resource allocation and semi-static resource coordination, avoided the interference of minizone, effectively utilized frequency spectrum resource, improve the systematic function of cell boarder simultaneously, and satisfied the different border loading demand of different districts.
(2) the present invention adopts and divides the fixed frequency resource earlier to each sub-district; Relatively required frequency resource in sub-district and fixed frequency resource size when the required frequency resource in sub-district during smaller or equal to described fixed frequency resource, only take required frequency resource; Unappropriated residual frequency resource is designated as the idle frequence resource; When the required frequency resource in sub-district during, take whole fixed frequency resources of distribution, and the idle frequence resource of neighbor cell is redistributed to this sub-district greater than the fixed frequency resource;
Perhaps, only distribute required frequency resource to give this sub-district when the required frequency resource in sub-district during smaller or equal to described fixed frequency resource; Unappropriated residual frequency resource is designated as the idle frequence resource; When the required frequency resource in sub-district during, distribute the fixed frequency resource to give this sub-district, and give this sub-district the idle frequence resource allocation of neighbor cell greater than described fixed frequency resource;
Wherein, the frequency resource of distribution can specially refer to the basic frequency resource, uses the high transmit power thresholding.
Therefore, the present invention has realized the loading demand different according to different districts, adjusts the frequency resource that community user (particularly boundary user) takies, to realize bigger cell boarder throughput.
(3) in the methods of the invention, whole in the network are distinguished into some groups for a short time, make each sub-district in every group non-conterminous mutually; System frequency resource is divided into mutually on the same group according to the order of sequence, make the unique corresponding cell set of every class frequency resource, to each sub-district in the respective cell group, each frequency subband comprises one or more frequency sub-carrier to several subbands that every class frequency resource is comprised as the fixed frequency resource allocation; Like this, just realized the basic frequency resource non-overlapping copies that the neighbor cell boundary user is shared, to reduce presence of intercell interference.
(4) in the methods of the invention, also distribute to the resource requirement sub-district, avoid neighbor cell to take identical basic frequency as far as possible, to reduce the co-channel interference of minizone by the public idling-resource of selecting neighbor cell.
Description of drawings
Fig. 1 is the inventive method flow chart;
Fig. 2 is the basic frequency schematic diagram of 3 o'clock neighbor cell use quadratures for the embodiment of the invention frequency reuse factor;
Fig. 3 adopts concentration of transmissions to distribute continuous subband schematic diagram for adjacent 3 sub-districts in the embodiment of the invention;
Fig. 4 is that the transmission assignment interval subband schematic diagram that distributes is adopted in adjacent 3 sub-districts in the embodiment of the invention;
Fig. 5 is a cell frequency resources distributing equipment functional module structure schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, be example to distribute the basic frequency resource to cell boundary users, the inventive method is described in detail.
Referring to Fig. 1, the inventive method comprises the steps:
The information of step S11, each sub-district periodic report indication oneself boundary user load situation or required frequency resource.
Each sub-district is according to channel quality indication (the Channel QualityIndicator of these all user feedbacks of sub-district, CQI) calculate each user's geometrical factor, the method of this computational geometry factor can be with reference to the method that provides among the R1-050599, and set criterion and judge which user is a central user, which is a boundary user; Next, calculate the loading demand of this cell boarder, and then the required frequency resource of each cell boundary users what calculate, represent with the number of frequency subband according to the number of boundary user and each user's loading condition.Wherein, come the calculated rate subband number can be according to determining that under fully loaded situation the load size that can transmit calculates the load size that can transmit on each frequency subband as unit coefficient by loading demand, this unit coefficient can be adjusted according to actual engineering specifications.
Step S12, the information that reports according to each sub-district are determined the required basic frequency resource in each sub-district, or the required frequency resource that reports according to each sub-district, compare with the fixedly basic frequency resource that is allocated to this sub-district, determine the resource requirement sub-district that needs additional allocation basic frequency resource.
The entity of execution in step S12 is high-rise Centroid or controller, and this controller is positioned at high-rise Centroid or cell base station.
The frequency re-use factor of supposing each cell boarder is 3 o'clock, and the boundary user of per 3 neighbor cells uses 1/3 mutually orthogonal frequency resource to carry out transfer of data as the basic frequency resource.As shown in Figure 2, be example with the situation of 19 sub-districts, all microzonations are divided into 3 groups, represent that each sub-district in every group is non-conterminous mutually for every group with different patterns, the frequency resource of mutually orthogonals is used in adjacent not on the same group 3 sub-districts.With the 10MHz bandwidth mode is example, and effective 600 subcarriers are divided into 24 subbands; Then all frequency subbands also are divided into 3 groups, every group comprises 8 subbands.In order better to carry out semi-static resource coordination, when the fixing basic frequency resource of original allocation is given each cell set and readjusted resource, can take the method that is numbered according to every class frequency resource, frequency subband is distributed to each sub-district.The method of salary distribution of this numbering goes for different resource multiplex modes, as centralized (Localized) and distributed (Distributed), as shown in Figure 3, Figure 4.
When the method for salary distribution of resource multiplex adopts when centralized, adjacent 3 subbands that cell allocation is continuous, its schematic diagram is as shown in Figure 3.The frequency resource of distributing to first group of sub-district A is 8 the most preceding continuous frequency subband A0～A7, the frequency resource of distributing to second group of sub-district B is 8 middle continuous frequency subband B0～B7, and the frequency resource of distributing to the 3rd group of sub-district C is 8 last continuous frequency subband C0～C7.
When the method for salary distribution of resource multiplex adopts when distributed, adjacent 3 cell allocation subband at interval, its schematic diagram is as shown in Figure 4.The frequency subband of distributing to first group of sub-district A is A0～A7, and the frequency subband of distributing to second group of sub-district B is B0～B7, and the frequency subband of distributing to the 3rd group of sub-district C is C0～C7.This three class frequencys subband space.
In conjunction with Fig. 2, that is:
The basic frequency subband that is numbered seven cell allocation of 1,9,11,13,15,17 and 19 is A0～A7;
The basic frequency subband that is numbered six cell allocation of 2,4,6,10,14 and 18 is B0～B7;
The basic frequency subband that is numbered six cell allocation of 3,5,7,8,12 and 16 is C0～C7.
The frequency subband number that cell boundary users is required and the basic frequency subband number of this cell allocation compare, when required frequency subband number during smaller or equal to the basic frequency subband number of this cell allocation, this cell boundary users only takies its required frequency subband number; And write down the unappropriated idle subband number in this sub-district; When the boundary user of each sub-district takies the basic frequency resource of distribution, can numbering from small to large according to the subband among Fig. 3, Fig. 4, the ascending order arrangement takies, for example, when certain sub-district belongs to cell set A, the frequency subband number that demand takies is 5, and then its frequency subband that takies can be A0, A1, A2, A3 and A4.
When the required subband number of cell boundary users during greater than the basic frequency subband number of this cell allocation, the boundary user of this sub-district takies whole basic frequency resources of distribution, and identifying this sub-district is the resource requirement sub-district, and calculates the subband number that it needs additional allocation.
Step S13, record, sort and select a resource requirement sub-district.
When having two or more sub-districts in the network system when needing the additional allocation resource, can take to satisfy earlier the bigger sub-district of resources requirement, be about to each sub-district that needs extra resource and sort from big to small, all select the sub-district of resources requirement maximum to carry out resource coordination at every turn by the subband number of its needs.Can certainly take other sortord, carry out the demand resource coordination such as sub-district of picked at random in a plurality of resource requirements sub-district.
Step S14, judge whether the neighbor cell of resource requirement sub-district has public idling-resource.Specifically comprise:
Select a neighbor cell group adjacent with the resource requirement sub-district; Judge at first whether whole neighbor cells adjacent with the resource requirement sub-district in this cell set have public idle subband, judge promptly whether the minimum value of idle subband in whole neighbor cells adjacent with the resource requirement sub-district satisfies the subband number of this required additional allocation in resource requirement sub-district; If then in its public idle subband, need the subband number of additional allocation to distribute to this resource requirement sub-district this resource requirement sub-district.
If there are a plurality of neighbor cell groups the resource requirement sub-district, the priority orders of each neighbor cell group can be set; At first select the highest neighbor cell group of priority level; If judging does not have public idle subband, then select next neighbor cell group to judge by the priority orders that is provided with.
For example, suppose that the sub-district 1 among Fig. 2 is the resource requirement sub-district, after its cell boundary users takies the whole basic frequency resource A0～A7 that distribute to sub-district 1, also need 2 extra frequency subbands could satisfy the resource requirement of boundary user.At this moment, select neighbor cell group B according to the priority orders that sets in advance.Sub-district adjacent with sub-district 1 among this neighbor cell group B is respectively sub-district 2, sub-district 4 and sub-district 6; Now suppose:
Idle subband B5, B6 and B7 are arranged in the sub-district 2;
Idle subband B6 and B7 are arranged in the sub-district 4;
Idle subband B7 is only arranged in the sub-district 6;
Then the public idle subband of this three sub-districts adjacent with sub-district 1 is subband B7 among the cell set B; And sub-district 1 needs 2 extra frequency subbands, and therefore, the public idle subband among the cell set B can not satisfy the requirement of sub-district 1.In this case, select another neighbor cell group C of sub-district 1 once more, and judge among the neighbor cell group C in sub-district 3, sub-district 5 and the sub-district 7 adjacent whether 2 public idle subbands are arranged with sub-district 1.
If neighbor cell has public idling-resource in the neighbor cell group of resource requirement sub-district, then execution in step S15; Otherwise, execution in step S16;
Step S15, in public idle subband, need the subband number of additional allocation to distribute to this resource requirement sub-district this resource requirement sub-district.
Still adopt to go up example, suppose among the cell set C that the idle subband in sub-district 3, sub-district 5 and the sub-district 7 adjacent with sub-district 1 is respectively (boundary user of each sub-district by the subband ascending order take its need sub band number):
Idle subband C3, C4, C5, C6 and C7 are arranged in the sub-district 3;
Idle subband C4, C5, C6 and C7 are arranged in the sub-district 5;
Idle subband C5, C6 and C7 are arranged in the sub-district 7;
Like this, these 3 neighbor cells have public idle subband C5, C6 and C7, and sub-district 1 only needs 2 extra frequency subbands, therefore, can select 2 subbands to distribute to sub-district 1 in public idle subband C5, the C6 of this neighbor cell group C and C7.
When selecting the idle subband of neighbor cell, can adopt the order opposite to select with home cell boundary user acquisition frequency subband.If that is: () order takies subband to cell boundary users or from big to small from small to large by sub-bands of frequencies, when then carrying out the frequency resource reallocation in the minizone, () reverse order is redistributed to the resource requirement sub-district or from small to large from big to small by its idle sub-bands of frequencies.
In the last example, need in C5, C6 and C7, select 2 subbands to distribute to sub-district 1; Because cell boundary users is to take subband by sub-bands of frequencies order from small to large, therefore, C6 and C7 is distributed to sub-district 1.
The resource requirement sub-district is given in the idle frequence resource allocation of step S16, a neighbor cell of selection.
Judge when whole neighbor cell groups and to finish when not having public idle subband to satisfy the subband number of this required additional allocation in resource requirement sub-district, according to the priority of neighbor cell group from high to low order and every group in the idle sub band number of each neighbor cell order from small to large, judge successively whether the idle subband in each neighbor cell satisfies the subband number of this required additional allocation in resource requirement sub-district; After matching the neighbor cell that satisfies condition, need the subband number of additional allocation to distribute to this resource requirement sub-district by this resource requirement sub-district its idle subband.
Finish if all neighbor cells are all judged, do not match the neighbor cell that satisfies condition, then select the maximum neighbor cell of idle subband, give this resource requirement sub-district its whole idle allocation of subbands.
Still adopt to go up example, select cell set B earlier, because the sub-district adjacent with sub-district 1 is respectively sub-district 2, sub-district 4 and sub-district 6 among the cell set B; And:
Idle subband B5, B6 and B7 are arranged in the sub-district 2;
Idle subband B6 and B7 are arranged in the sub-district 4;
Idle subband B7 is only arranged in the sub-district 6;
Its idle subband number sequence arrangement is from small to large pressed in sub-district 2, sub-district 4 and sub-district 6, then:
Formation each be: sub-district 6;
Per two of formation is: sub-district 4;
Per three of formation is: sub-district 2;
Earlier judge whether the idle subband number of first sub-district 6 of formation meets the demands, because sub-district 1 needs 2 subbands of additional allocation, and only there is an idle subband sub-district 6, and therefore, sub-district 6 is undesirable;
Whether the idle subband number of judging second sub-district 4 of formation again meets the demands, because sub-district 1 needs 2 subbands of additional allocation, and just in time there are 2 idle subbands sub-district 4, and therefore, sub-district 4 meets the requirements; Like this, just 2 in the sub-district 4 idle subband B6 and B7 are distributed to sub-district 1.In this case, because subband B6 takies by the boundary user of sub-district 6, therefore, the basic frequency resource that use adjacent sub-district 1 and sub-district 6 overlap (all having used subband B6).
Certainly, if sub-district 1 needs the sub band number of additional allocation too much, the idle subband of its each neighbor cell all can't satisfy its requirement.
For example, suppose that sub-district 1 needs the subband of 6 additional allocation, and the idle subband situation of its neighbor cell 2-7 as mentioned above, then the idle subband of neither one neighbor cell satisfies its requirement.In this case, select the maximum neighbor cell of idle subband 3, with its whole idle subband C3, C4, C5, C6 and C7; , all distribute to resource requirement sub-district 1.At this moment, (sub-district 1 comprises basic frequency subband C3, C4 after the overfrequency reallocation some overlapping situation of basic frequency resource that a plurality of neighbor cells use may to occur, and the basic frequency that its neighbor cell 7 uses also comprises subband C3, C4, therefore, in neighbor cell 1 and sub-district 7, identical basic frequency subband C3, C4 have been used), lap can take to disturb average or interference eliminated mode, for example can play the average effect of disturbing by increasing scrambler; Carry out Interference Detection and solve interference signal and interference separation is gone out, can reduce the influence of interference more.
The occupation condition of step S17, renewal resource requirement sub-district and neighbor cell.
System should upgrade its actual resource that takies in order to grasp the resource occupation situation of each sub-district in real time for the sub-district of having carried out the frequency resource reallocation.
Step S18, judge whether in the system all the resource requirement sub-districts all carried out redistribute resources, promptly whether travel through whole resource requirements sub-district, if also have the resource requirement sub-district not processed, then go to step S13; Otherwise, finish inter-cell frequency resources reallocation in this cycle.
According to said method dividing frequency resource of the present invention, the frequency resource that may occur having distributed this sub-district can't satisfy the demands, and neighbor cell does not have the free time or through coordinating but still have the part demand to satisfy, need carry out demand and the fairness that scheduling of resource satisfies each user this moment in this inside, sub-district.Sub-district internal resource scheduling, the mode that can adopt comprises:
Boundary user preemption dominant frequency when not satisfying demand, then accounts for the demand that time frequency satisfies throughput; Central user preemption time frequency also can account for dominant frequency when dominant frequency has the free time, or the like.
In addition, the distribution of sub-district internal resource can take equitable proportion (Proportional Fairness, PF), poll (Round Robin), maximum throughput rate (Max Throughput), minimax resource scheduling algorithms such as (Max-min).Specifically comprise: carry out equitable proportion (PF) scheduling respectively and give boundary user and central user with resource allocation on basic frequency and secondary frequencies, at first select boundary user to distribute dominant frequency, the sequencing of arranging according to PF comes Resources allocation.When this cell boarder demand during less than the basic frequency of distributing, then in remaining basic frequency, select central user, also the sequencing of arranging according to PF guarantees the throughput maximum; On secondary frequencies, also carry out PF and arrange central user.When the frequency needs of this cell boundary users during greater than the basic frequency of distributing, all basic frequencies are arranged boundary user according to PF, remaining boundary user and central user are carried out the PF scheduling on side frequency, but in order to guarantee the performance of these residue boundary users, the PF tolerance of this part boundary user be multiply by a weight coefficient, be equivalent to the CQI value that obtains according to high power transmission, boundary user after the weighting and central user are together used a PF scheduling competition secondary frequencies.
Perhaps, also can on basic frequency and secondary frequencies, adopt unified equitable proportion (PF) scheduling tolerance, just distribute the higher basic frequency of power for boundary user in order to guarantee as far as possible, the PF scheduling tolerance of boundary user on basic frequency and secondary frequencies all be multiply by one greater than 1 coefficient, the requirement when coefficient selection can be with reference to concrete Project Realization.At this moment, can guarantee under the condition that always cell/section throughput performance and fairness are traded off, to improve the performance of cell boundary users as far as possible.
According to said method of the present invention, the invention provides a kind of frequency resource allocation equipment, its functional module structure schematic diagram comprises as shown in Figure 5:
First functional unit receives the self load condition or the required frequency resource of each sub-district periodic report;
Second functional unit, the required frequency resource that reports according to each sub-district or determine the required frequency resource in each sub-district by the load state that reports after, relatively each sub-district required frequency resource that reports and fixed frequency resource size that is allocated to the sub-district, and output comparative result is given the 3rd functional unit;
The 3rd functional unit when comparative result when being the required frequency resource in sub-district smaller or equal to described fixed frequency resource, only distributes required frequency resource to give this sub-district; Unappropriated residual frequency resource is designated as the idle frequence resource;
When comparative result when being the required frequency resource in sub-district, distribute described fixed frequency resource to give this sub-district, and give this sub-district the idle frequence resource allocation of neighbor cell greater than described fixed frequency resource.
The present invention provides a kind of wireless communication system in addition, comprises several sub-districts and receives user terminal, also includes said frequencies resource allocation apparatus provided by the invention.The functional module structure schematic diagram no longer repeats as shown in Figure 5.
This frequency resource allocation equipment can be the independent physical entity that is provided with, and is connected with each cell base station by external interface; Be logic entity perhaps, be integrated in the top management node in the system.
Above-mentioned wireless communication system provided by the invention can be an ofdm system.
Above-mentioned wireless communication system provided by the invention can be uplink communication chain-circuit system or downlink communication chain-circuit system.
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 (25)
1, a kind of wireless system frequency resource allocation method is characterized in that, comprising:
The information of A, each sub-district periodic report indication self load condition or required frequency resource;
B, the information that reports according to each sub-district are determined the required frequency resource in each sub-district, whether judge the required frequency resource in each sub-district greater than the fixed frequency resource that is allocated to the sub-district, if then give this sub-district with the idle frequence resource allocation of neighbor cell.
2, the method for claim 1 is characterized in that, described step B comprises:
Distribute described fixed frequency resource to give each sub-district;
Relatively required frequency resource in sub-district and described fixed frequency resource size when the required frequency resource in sub-district during smaller or equal to described fixed frequency resource, only take required frequency resource; Unappropriated residual frequency resource is designated as the idle frequence resource;
When the required frequency resource in sub-district during, take whole fixed frequency resources of distribution, and the idle frequence resource of neighbor cell is redistributed to this sub-district greater than described fixed frequency resource.
3, the method for claim 1 is characterized in that, described step B comprises:
Relatively required frequency resource in sub-district and described fixed frequency resource size when the required frequency resource in sub-district during smaller or equal to described fixed frequency resource, only distribute required frequency resource to give this sub-district; Unappropriated residual frequency resource is designated as the idle frequence resource;
When the required frequency resource in sub-district during, distribute described fixed frequency resource to give this sub-district, and give this sub-district the idle frequence resource allocation of neighbor cell greater than described fixed frequency resource.
4, the method for claim 1 is characterized in that, the execution entity of described step B is high-rise Centroid or controller.
5, method as claimed in claim 4 is characterized in that, described controller is positioned at high-rise Centroid or cell base station.
As the described method of any claim of claim 1-5, it is characterized in that 6, the frequency resource of described distribution is the basic frequency resource, the transmitting power thresholding of its setting is higher than other frequency resource.
7, method as claimed in claim 6 is characterized in that, whole in the network are distinguished into some groups for a short time, makes each sub-district in every group non-conterminous mutually; System frequency resource is divided into mutually on the same group by the frequency size order, with every class frequency resource as unique each sub-district that is allocated in the cell set of described fixed frequency resource.
8, method as claimed in claim 7 is characterized in that, further every class frequency resource is divided into several frequency subbands;
In the described steps A, each sub-district calculates required frequency subband number according to self load condition;
Among the described step B, compare the subband number that required frequency subband number in each sub-district and described fixed frequency resource comprise, when subband number that required frequency subband number comprises smaller or equal to described fixed frequency resource, this community user only takies its required frequency subband number; Write down the unappropriated idle subband number in this sub-district;
When subband number that the required subband number of cell boundary users comprises greater than described fixed frequency resource, this cell boundary users takies whole subbands that described fixed frequency resource comprises, identifying this sub-district is the resource requirement sub-district, calculates the subband number that it needs additional allocation; And in the neighbor cell of described resource requirement sub-district, need the subband number of additional allocation to distribute the respective free subband to give this resource requirement sub-district by this resource requirement sub-district.
9, method as claimed in claim 8 is characterized in that, also comprises before giving the idle subband of described resource requirement cell allocation:
Add up described resource requirement sub-district number;
When having two or more described resource requirement sub-districts, need the subband number of additional allocation to sort by it each resource requirement sub-district, the preferential more described resource requirement sub-district of subband number that need to select additional allocation is for it distributes idle subband.
10, method as claimed in claim 9 is characterized in that, is also comprising behind the idle subband for described resource requirement cell allocation:
Upgrade the occupation condition in described resource requirement sub-district and the neighbor cell;
Travel through whole resource requirements sub-district.
11, method as claimed in claim 10 is characterized in that, the subband that the fixed frequency resource that is allocated to each sub-district is comprised sorts by the frequency size;
Community user takies frequency subband by ascending order/descending by the number of its required frequency subband;
The idle subband of neighbor cell is pressed descending/ascending order arrange, and its idle subband is distributed to the resource requirement sub-district by the subband number that the resource requirement sub-district needs by putting in order.
12, method as claimed in claim 10 is characterized in that, for the concrete grammar of the idle subband of described resource requirement cell allocation is:
Select a neighbor cell group adjacent with described resource requirement sub-district;
Judge whether whole neighbor cells adjacent with described resource requirement sub-district in this cell set have public idle subband to satisfy the subband number of this required additional allocation in resource requirement sub-district; If then in public idle subband, need the subband number of additional allocation to distribute to this resource requirement sub-district this resource requirement sub-district.
13, method as claimed in claim 12 is characterized in that, also comprises the priority orders that described neighbor cell group is set; Judge successively by the priority orders that is provided with whether described public idle subband is arranged in each neighbor cell group.
14, method as claimed in claim 13, it is characterized in that, when whole neighbor cell groups judgements finish, when not having described public idle subband to satisfy the subband number of this required additional allocation in resource requirement sub-district, according to the priority of neighbor cell group from high to low order and every group in the idle sub band number of each neighbor cell order from small to large, judge successively whether the idle subband in each neighbor cell satisfies the subband number of this required additional allocation in resource requirement sub-district;
After matching the neighbor cell that satisfies condition, need the subband number of additional allocation to distribute to this resource requirement sub-district by this resource requirement sub-district its idle subband.
15, method as claimed in claim 14 is characterized in that, if there is not to match the neighbor cell that satisfies condition, then maximum idle sub band number in the neighbor cell group is distributed to described resource requirement sub-district.
16, method as claimed in claim 15 is characterized in that, comprises that also inside, sub-district carries out the step of frequency resource scheduling.
17, method as claimed in claim 16 is characterized in that, inside, described sub-district is carried out the frequency resource scheduling and included but not limited to:
Equitable proportion PF scheduling mode, polling dispatching mode, maximum throughput rate scheduling mode or maximum-least resource scheduling mode.
18, method as claimed in claim 17 is characterized in that, described PF scheduling comprises:
Basic frequency and secondary frequencies are carried out the PF scheduling respectively; Specifically comprise:
Earlier by PF value size order ordering the carry out resource allocation of each boundary user on basic frequency; When the frequency resource of this cell boundary users demand during, sort by the PF value size order of each central user on remaining basic frequency and to carry out resource allocation less than the basic frequency of distributing; Again by PF value size order ordering the carry out resource allocation of each central user on secondary frequencies;
When the frequency resource of this cell boundary users demand during, sort by the PF value size order of each boundary user on basic frequency and to carry out resource allocation more than or equal to the basic frequency of distributing; The residue boundary user and the central user that are not assigned to the basic frequency resource are carried out the PF scheduling on secondary frequencies.
19, method as claimed in claim 18 is characterized in that, described residue boundary user and central user are carried out the PF scheduling on secondary frequencies, comprising:
With the PF of the shared basic frequency of described residue boundary user on duty with one greater than 1 weight coefficient;
Press PF value size described residue boundary user of ordering and central user, carry out the secondary frequencies resource allocation successively.
20, method as claimed in claim 17 is characterized in that, described PF scheduling comprises:
The sub-district secondary frequencies that sub-district basic frequency that boundary user is taken and central user take adopts unified PF scheduling;
The basic frequency that boundary user is taken and the PF value of secondary frequencies all multiply by one greater than 1 weight coefficient;
Press PF value size each boundary user of ordering and central user, carry out basic frequency resource and secondary frequencies resource allocation successively.
21, a kind of frequency resource allocation equipment is characterized in that, comprising:
First functional unit receives the indication self load condition of each sub-district periodic report or the information of required frequency resource;
Second functional unit is determined the required frequency resource in each sub-district according to the information that each sub-district reports, and relatively each sub-district required frequency resource that reports and fixed frequency resource size that is allocated to the sub-district, and output comparative result is given the 3rd functional unit;
The 3rd functional unit when comparative result when being the required frequency resource in sub-district smaller or equal to described fixed frequency resource, only distributes required frequency resource to give this sub-district; Unappropriated residual frequency resource is designated as the idle frequence resource;
When comparative result when being the required frequency resource in sub-district, distribute described fixed frequency resource to give this sub-district, and give this sub-district the idle frequence resource allocation of neighbor cell greater than described fixed frequency resource.
22, a kind of wireless communication system comprises several sub-districts and receives user terminal, it is characterized in that, also includes frequency resource allocation equipment; Described frequency resource allocation equipment comprises:
First functional unit receives the indication self load condition of each sub-district periodic report or the information of required frequency resource;
Second functional unit is determined the required frequency resource in each sub-district according to the information that each sub-district reports, and relatively each sub-district required frequency resource that reports and fixed frequency resource size that is allocated to the sub-district, and output comparative result is given the 3rd functional unit;
The 3rd functional unit when comparative result when being the required frequency resource in sub-district smaller or equal to described fixed frequency resource, only distributes required frequency resource to give this sub-district; Unappropriated residual frequency resource is designated as the idle frequence resource;
When comparative result when being the required frequency resource in sub-district, distribute described fixed frequency resource to give this sub-district, and give this sub-district the idle frequence resource allocation of neighbor cell greater than described fixed frequency resource.
23, wireless communication system as claimed in claim 22 is characterized in that, described frequency resource allocation equipment is the independent physical entity that is provided with, and is connected with each cell base station by external interface; Perhaps
Described frequency resource allocation equipment is logic entity, is integrated in the top management node in the system.
As claim 22 or 23 described wireless communication systems, it is characterized in that 24, described wireless communication system is an ofdm system.
As claim 22 or 23 described wireless communication systems, it is characterized in that 25, described wireless communication system is uplink communication chain-circuit system or downlink communication chain-circuit system.
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| CNA2006100789643A CN101064905A (en) | 2006-04-28 | 2006-04-28 | Wireless system frequency resources distribution method, equipment and wireless communication system |
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| CNA2006100789643A CN101064905A (en) | 2006-04-28 | 2006-04-28 | Wireless system frequency resources distribution method, equipment and wireless communication system |
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