CN101155417B - Channel resource allocation method and device for cellular system - Google Patents
Channel resource allocation method and device for cellular system Download PDFInfo
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Abstract
A channel resource distributing method and device of a cellular system are disclosed in the present invention, wherein, the method comprises: step one, to divide the channel resource in each sector of cellular system cell into multiple according the frequency spectrum, and to lead each channel resource to have priority for deciding using order; step two, in the sectors of each cell existing co-frequency interference, by setting the priority, to lead each sector existing co-frequency interference to use firstly the channel resource with different frequency to the interference cell. The present invention fractionizes the channel resources in the vectors, effectively avoiding the co-frequency interference. The priority of the channel resource is pre-established, and solidified in configuration of the cell sector, needless to calculate real time, the method is simple and easy, and the cost is lower.
Description
Technical field
The present invention relates to the mobile communication cell networking technology, particularly relate to a kind of channel resource allocation method and device of cellular system.
Background technology
For mobile communications network, people adopt honeycomb to carry out cell networking always for a long time.For beehive net, multiple scheme is arranged at present, mainly comprise dynamic group net and static networking, dynamic group net is according to the loading condition of each sub-district and disturbed condition, dynamically in each minizone dividing frequency resource, dynamic group net technical sophistication degree is very high, and cost is also very high.It is static that networking is more representational is: soft-frequency reuse networking, center be multiplexed with 1 and the edge be multiplexed with 3 networkings, three sector networkings etc., at present more, and use wider for the research of three sector networking plans.Though adopt the networking plan better performances of three sectors, its co-channel interference is still bigger, still has bigger room for promotion for systematic function.
The existing technology of improving co-channel interference between the sector can be with reference to U.S. Pat 2006148484 (Cellplanning methods and apparatus, and networks configured based on same), this patent is used different poliarizing antennas between different sectors, solve problem of co-channel interference in this way, this method is to changing bigger to the network hardware, implement more complicated, cost is higher.And existing various networking plans are also generally all just considered the resource allocation between sub-district or the sector, and the resource allocation that seldom takes into account inside, step refining sector is to reduce co-channel interference.
Resource refinement for inside, sector, following technology has appearred now: band system band is divided into frame, again frame is divided into sub-band, sub-band is divided into the range of distribution of preferred and standard by time shaft, the feasible preferred allocation zone of distributing to the same sub-band of different districts sector does not overlap each other, to reduce the technical scheme of co-channel interference; In addition, also occurred:, reduce the technical scheme of co-channel interference effectively by being the distribution that standard is adjusted channel in each sector with the interference volume.And these technical schemes no matter to adopt time domains segmentation resources still be that standard is segmented resource with the interference volume, all need bigger amount of calculation, more complicated implements the comparison difficulty.Therefore, need to propose little, the simple and easy to do resource allocation methods of a kind of amount of calculation, come the internal resource of sector is segmented, to reduce the co-channel interference of minizone.
Summary of the invention
The object of the present invention is to provide channel resource allocation method and device in a kind of cellular system, solve prior art and in the process that the resource in the sector is segmented, need bigger amount of calculation, the process complexity, the technical problem of reduction co-channel interference that can not be simple and effective.
To achieve these goals, the invention provides a kind of channel resource allocation method of cellular system, wherein in, comprise the steps: step 1, channel resource in each sector of cellular system sub-district is divided into many parts by frequency spectrum, and makes every part of channel resource have the priority that is used to determine to use sequencing; Step 2 in the sector of each sub-district that has co-channel interference, can farthest avoid using the channel resource of same frequency by setting described priority, make each sector that has co-channel interference, thereby reduces the number and the interference strength in co-channel interference source; The channel resource high with the priority of interference sector is set to the low channel resource of this sector priority with channel resource frequently; The channel resource low with the priority of interference sector is set to the high channel resource of this sector priority with channel resource frequently.
Above-mentioned method, wherein, described priority is divided into three grades.
Above-mentioned method, wherein, described priority is to preestablish and remain unchanged in the use of channel resource.
In order to realize purpose of the present invention, the present invention also provides the device of the channel resource allocation in a kind of cellular system, wherein, comprise: the channel resource allocation module, be used for the channel resource in each sector of cellular system sub-district is divided into many parts by frequency spectrum, and make every part of channel resource have the priority that is used to determine to use sequencing; The priority level initializing module is used in the sector of each sub-district that has co-channel interference, by setting the channel resource that described priority makes preferential employing in each sector that has co-channel interference and interference sector different frequency; The channel resource high with the priority of interference sector is set to the low channel resource of this sector priority with channel resource frequently; The channel resource low with the priority of interference sector is set to the high channel resource of this sector priority with channel resource frequently.
Above-mentioned device, wherein, described cellular system is the cellular system of three sector networkings.
Above-mentioned device, wherein, described priority level initializing module preestablishes described priority, and the described priority after setting remains unchanged in the use of channel resource.
Above-mentioned device, wherein, described priority level initializing module is divided into three grades with priority.
The invention has the advantages that:
1) by channel resource is divided into many parts according to frequency, and sets priority, make the preferential channel resource that adopts with the interfered cell different frequency in each sub-district that has co-channel interference, effectively avoided co-channel interference.
2) can set a plurality of priority, thereby according to different needs resource be carried out in various degree segmentation, adaptability is strong.
3) priority of channel resource is for preestablishing, and is solidificated in the configuration of cell sector, need not real-time operation, and method is simple, with low cost.
4) as long as local resource has surplus, the resource frequency that just can as far as possible stagger between the interfered cell to be adopted, and because the resource of common cell configuration all can have surplus, so the inventive method is widely used, effect is remarkable.
Description of drawings
Fig. 1 is the disturbed condition distribution map of traditional three sector networking plans;
Fig. 2 is many parts a schematic diagram with different priorities that the channel resource in the sector is divided into provided by the invention;
Fig. 3 is the interference profile figure of the inventive method networking under load 1/3 situation;
Fig. 4 is the interference profile figure of the inventive method networking under load 2/3 situation;
Fig. 5 is the performance gain of system under the different loads distribution situation.
Embodiment
Explain embodiments of the present invention below in conjunction with three traditional sector scheme.
Fig. 1 is the disturbed condition distribution map of traditional three sector networking plans, with 19 sub-districts is that example is analyzed, as shown in the figure, filling part is represented sector identical with the channel resource frequency of reference sector 100 in three sector strucres among the figure, in this framework, it is a key factor of system for restricting throughput that shared channel disturbs.Interference analysis is carried out in sector 100, as can be seen: because antenna has directivity, with respect to sector 100, there are seven interference sources that are positioned at its left side altogether, wherein disturbing the strongest to it is two sectors 102,103 that nearest grid is filled, secondly is five sectors 101,104 to 107 that oblique line is filled.
After the present invention is applied in three sector networking plans, at first the channel resource in the sector is divided into three parts by frequency: channel resource 1, channel resource 2 and channel resource 3, every part all has the priority of oneself, as shown in Figure 2, for the channel resource in the sector being divided into many parts schematic diagram with different priorities, in Fig. 2, if the priority of channel resource 1 is chosen as the 3rd, the priority of channel resource 2 is chosen as the second, and the priority of channel resource 3 is chosen as the first, so, the sector will be according to channel resource 3, channel resource 2, the order of channel resource 1 has been used channel resource, this use is designated as (3,2,1) in proper order.In like manner, be designated as (1 in proper order for use, 2,3) sector, the preferential channel resource 1 that uses high priority in the time of the scheduling channel resource is along with load increases, when the high priority channel resource uses up, can continue to use the channel resource 2 or the channel resource 3 of low priority, but must use according to predefined priority orders.In this manner, the channel resource in each sector can have multiple different uses order according to different priority.
In the embodiment of Fig. 3 and Fig. 4, it is { (1,2,3) in proper order that the present invention has selected three kinds of uses, (2,3,1), (3,1,2) } channel resource in each sector is set, wherein, sector 100 is chosen as (1,2,3), sector 101,104,106 is chosen as (1,2,3), sector 102,107 is chosen as (2,3,1), sector 103 is chosen as (3,1,2).
If the load in all sectors is all smaller or equal to 1/3, then the channel resource that preferentially uses in each sector as shown in Figure 3, sector 100 selective channel resources 1, apart from nearest two sub-districts 102,103, sector 100 selective channel resource 1 at first not, but selected channel resource 2 and channel resource 3 respectively, avoided co-channel interference with sector 100.
Fig. 3 is analyzed, as can be seen, to sector 100 generation interference are sectors 101,106,104, with Fig. 1 contrast as can be seen, this is to disturb the most weak several sectors among Fig. 1, and the strongest sector 102 of interference among Fig. 1,103 owing to carried out the planning of frequency spectrum priority, it no longer is the co-channel interference source, this shows that the present invention uses the number that can significantly reduce interference source based on the method for channel allocation of priority, reduced to three among Fig. 3 by seven among Fig. 1 and (reduced by two strong interferers sectors 102, sector, 103 and two weak jamming sources 105,107), so the inventive method can reduce co-channel interference greatly under the lighter situation of load.
When load further increased, the channel resource of low priority was continued to use in each sector after using up the high priority channel resource.As shown in Figure 4, be under 2/3 the situation for all sector load, interference source analysis to sector 100, here only analyzing in load is the co-channel interference situation of relative channel resource 1 under 2/3 situation, as seen from Figure 4, channel resource 1 has been reduced among Fig. 4 (sector 103) apart near strong interferers by two among Fig. 1 (sectors 102,103) relatively, and four among Fig. 4 (sector 101,105,106,104) have been reduced to by five among Fig. 1 in the weak jamming source.Load is Fig. 3 of 1/3 relatively, increased a strong interferers and a weak jamming source, but co-channel interference also is significantly less than tradition three sector strucres of Fig. 1.Therefore, the angle from statistics can know that so long as not fully loaded, channel resource allocation method of the present invention just can reduce interference greatly.
Therefore, by Fig. 3 Fig. 4 as can be known, the inventive method can be reached following effect:
When cell load smaller or equal to 1/3 the time, can reduce co-channel interference greatly;
Even load surpasses 1/3 less than under 1 the situation, traditional relatively three sector scheme of the inventive method still can reduce whole co-channel interference;
Unbalanced when load, the sub-district that promptly has is fully loaded, under the situation of the sub-district underloading that has, is used in combination power control and the inventive method and still can reduces co-channel interference, improves power system capacity.
In addition, priority among the present invention is not limited to three grades, channel resource among the present invention can be divided into more parts as required, priority is also corresponding with the umber of channel resource, those skilled in the art can be divided into three parts situation with channel resource and priority and analogize and implement to be divided into many parts situation fully according to above, and its effect can be more obvious.
Below, be the process of the inventive method being carried out numerical simulation.
Simulated conditions: 19 sub-districts are arranged in the system, and system bandwidth is 10M, and simulation result is the average throughput of a sub-district.
Because system always need reserve certain bandwidth in practice, thus here simulation analysis the time taking into account system at the performance gain of undercapacity (2/3 load and 1/3 load different distributions in the system) situation the inventive method.Fig. 5 is the performance gain of each sub-district under different load Distribution situations in the system.
Wherein, the 2/3 load Distribution factor is respectively [1/7 1/6 1/5 1/4 1/3 1/21], coefficient in the bracket is represented the distribution situation of 2/3 load in the system, it is 2/3 that 1/7 cell load is for example arranged in the middle of the coefficient 1/7 expression system (whole 19 sub-districts), all the other cell loads of 6/7 are 1/3, it is 2/3 that 1/6 cell load is in like manner arranged in the middle of the 1/6 expression system (19 sub-districts), and all the other cell loads of 5/6 are 1/3, and all the other coefficient implications can be analogized.
As seen from Figure 5, when cell load in the system is that 2/3 sub-district number is 1/7 in (among the figure 0.14 of transverse axis), promptly 1/3 loaded cell number is 6/7 o'clock, the system of employing the inventive method (being arranged in the broken line of top among the figure) is very big with the gain that traditional scheme (figure is positioned at the broken line of below) is compared throughput, the approximately gain of 1.2M; When system load increases is that load is that 2/3 sub-district number is when increasing, performance gain based on the channel resource precedence scheme reduces, but, as long as still there is remaining bandwidth in system, promptly there is the channel resource of low priority not use, the inventive method just has certain performance gain, and promptly under same bandwidth situation, the number of users that the inventive method can be supported is more or service rate is higher.
As from the foregoing, the present invention has following advantage:
1) by channel resource is divided into many parts according to frequency, and sets priority, make the preferential channel resource that adopts with the interfered cell different frequency in each sub-district that has co-channel interference, effectively avoided co-channel interference.
2) can set a plurality of priority, thereby according to different needs resource be carried out in various degree segmentation, adaptability is strong.
3) priority of channel resource is for preestablishing, and is solidificated in the configuration of cell sector, need not real-time operation, and method is simple, with low cost.
4) as long as local resource has surplus, the resource frequency that just can as far as possible stagger between the interfered cell to be adopted, and because the resource of common cell configuration all can have surplus, so the inventive method is widely used, effect is remarkable.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. the channel resource allocation method of a cellular system is characterized in that, comprises the steps:
Step 1 is divided into many parts with the channel resource in each sector of cellular system sub-district by frequency spectrum, and makes every part of channel resource have the priority that is used to determine to use sequencing;
Step 2 in the sector of each sub-district that has co-channel interference, can farthest avoid using the channel resource of same frequency by setting described priority, make each sector that has co-channel interference, thereby reduces the number and the interference strength in co-channel interference source; The channel resource high with the priority of interference sector is set to the low channel resource of this sector priority with channel resource frequently; The channel resource low with the priority of interference sector is set to the high channel resource of this sector priority with channel resource frequently.
2. method according to claim 1 is characterized in that, described priority is divided into three grades.
3. method according to claim 1 is characterized in that, described priority is to preestablish and remain unchanged in the use of channel resource.
4. the channel resource allocation device in the cellular system is characterized in that, comprising:
The channel resource allocation module is used for the channel resource in each sector of cellular system sub-district is divided into many parts by frequency spectrum, and makes every part of channel resource have the priority that is used to determine to use sequencing;
The priority level initializing module is used in the sector of each sub-district that has co-channel interference, by setting the channel resource that described priority makes preferential employing in each sector that has co-channel interference and interference sector different frequency; The channel resource high with the priority of interference sector is set to the low channel resource of this sector priority with channel resource frequently; The channel resource low with the priority of interference sector is set to the high channel resource of this sector priority with channel resource frequently.
5. device according to claim 4 is characterized in that, described cellular system is the cellular system of three sector networkings.
6. device according to claim 4 is characterized in that, described priority level initializing module preestablishes described priority, and the described priority after setting remains unchanged in the use of channel resource.
7. device according to claim 6 is characterized in that, described priority level initializing module is divided into three grades with priority.
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| CN102386989A (en) * | 2010-08-31 | 2012-03-21 | 中国移动通信集团公司 | Frequency multiplexing networking method and system |
| CN104094651B (en) * | 2011-12-02 | 2018-07-24 | 诺基亚通信公司 | The coordination frequency spectrum allocation and deallocation of frequency spectrum fragmentation is minimized in cognitive radio networks |
| CN103220719B (en) * | 2012-01-20 | 2015-11-11 | 普天信息技术研究院有限公司 | A kind of carrier wave MRP method under carrier aggregation scene |
| CN106332288A (en) * | 2015-07-01 | 2017-01-11 | 中兴通讯股份有限公司 | Multi-carrier aggregation network configuration method, device and corresponding network |
| CN107666711B (en) * | 2016-07-27 | 2020-10-02 | 成都鼎桥通信技术有限公司 | Downlink resource configuration method and device |
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