CN101626579B - Method for allocating downlink and uplink proportion - Google Patents
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Abstract
The invention provides a method for allocating downlink and uplink proportion used in a wireless communication system, which comprises the following steps: setting a transition area between two adjacent allocation areas with different downlink and uplink proportions and setting layers of the transition area, wherein the layers of the transition area are two times of a difference of downlink or uplink subframes in different downlink and uplink proportions; and according to different downlink and uplink proportions, setting the downlink and uplink proportion of each layer. The method can eliminate the interference caused by different downlink and uplink proportion settings of base stations, thereby ensuring the coexistence of the base stations with different downlink and uplink proportion allocations.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of method for allocating downlink and uplink proportion that is used for wireless communication system.
Background technology
Mobile WiMAX (Worldwide Interoperability for Microwave Access, micro-wave access to global intercommunication) system mainly is based on the GSM of OFDMA (orthogonal frequency division multiplexing multiple access access).Under given system bandwidth, see that from the angle of frequency domain different users realizes that through the orthogonal sub-carriers resource that takies some multiple access inserts.In the WiMAX system of TDD (time division duplex) pattern, down link and up link are divided through the mode of time-division, down link to up link and up link to all corresponding conversion interval being set between the down link.
Along with the develop rapidly of the communication technology, high transfer rate, the high-throughput of following people to wide-band mobile communication, the demand of fast moving and low time delay can not have been satisfied based on the mobile WiMAX system of IEEE 802.16e air interface standard.At present, the TGm task groups of IEEE802.16 working group is being devoted to formulate improved air interface specification 802.16m, and this standard can be supported higher peak rate, higher spectrum efficiency and sector capacity.802.16m increased in the demand to supporting the requirement of new type of service, such as urgency traffic and interactive game.Because the variation of type of service, following up symmetrical service and the existence of up asymmetric traffic down cause in different overlay areas, and the service in base station model is different, and the TDD system is also just different to the requirement of downlink and uplink proportion configuration.Such as, some base stations are in Administrative Areas such as office building, and some base station mainly is in hot spot coverage, such as the airport, dining room etc., and some base stations are in the home dwelling zone, the service in base station model of these zoness of different is different.
In the design of agreement 16m frame structure, three layers of mentality of designing of superframe (super-frame), unit frame (frame) and subframe (sub-frame) have mainly been considered at present.
Fig. 1 shows the superframe structure of suggestion in the design of 16m frame structure in the prior art and forms sketch map, and the length of superframe 101 is 20ms, is made up of the unit frame 102 of 4 5ms, and superframe control information 103 is positioned on several symbols that superframe begins to locate.Unit frame 102 is made up of 8 sub-frame 104, and subframe 104 is divided into descending sub frame and sub-frame of uplink, can be configured according to system.Subframe 104 is made up of 6 OFDM symbols 105.According to the frame structure of Fig. 1, comprise 8 subframe units in the 5ms unit frame.
By on can know that the 16m unit frame is made up of 8 sub-frame, under tdd mode, exist different descending/sub-frame of uplink ratio 7: 1,6: 2,5: 3,4: 4,3: 5,2: 6,1: 7, be applicable to different downlink/uplink business proportion requirements respectively.
Prior art is according to the professional difference of different base station; Adopt different uplink downlink proportional arrangement; So just can make full use of the frequency spectrum resource of uplink downlink; Make the average throughput of the whole network reach maximization, but also therefore, make the base station of adjacent two different configuring areas when different transmission directions coexist, produce interference.
Summary of the invention
The present invention aims to provide a kind of method for allocating downlink and uplink proportion that is used for wireless communication system, when different transmission directions coexist, produces the problem of disturbing with the base station that solves adjacent two different configuring areas.
According to an aspect of the present invention; A kind of method for allocating downlink and uplink proportion that is used for wireless communication system is provided; Between adjacent two configuring areas with different downlink and uplink proportions, transitional region is set; Wherein, the number of plies of transitional region is set, the number of plies is the twice of the difference of downlink or uplink number of sub frames in the different downlink and uplink proportions; Every layer downlink and uplink proportion is set according to different downlink and uplink proportions.
Preferably, the number of plies that transitional region is set specifically comprises: when difference is N, and N＜7 o'clock, the number of plies that transitional region is set is 2 * N layer; Wherein, when N=1, the number of plies that transitional region is set is 2 layers.
Preferably, adjacent configuring area comprises: first configuring area and second configuring area have first downlink and uplink proportion and second downlink and uplink proportion respectively; In transitional region; From near the layer of first configuring area to being numbered 1 to 2N near the layer of second configuring area; The downlink and uplink proportion that is provided with every layer according to different downlink and uplink proportions specifically comprises: downlink and uplink proportion from layer 1 to layer 2N is set for progressively to change to second downlink and uplink proportion from first downlink and uplink proportion; Wherein, the downlink and uplink proportion of 2n layer and 2n-1 layer differs a sub-frame; The 2n-1 layer is identical with the downlink and uplink proportion of 2n-2 layer, n≤N.
Preferably, the number of plies of transitional region is 2 layers, and the downlink and uplink proportion that is provided with every layer according to different downlink and uplink proportions specifically comprises: the downlink and uplink proportion that is provided with the 1st layer is first downlink and uplink proportion; The downlink and uplink proportion that is provided with the 2nd layer is second downlink and uplink proportion.
Preferably, between adjacent two configuring areas with different downlink and uplink proportions, transitional region is set and also comprises: the frame number of unit frame in according to every layer, the descending sub frame or the sub-frame of uplink that are provided with near descending/up conversion interval are the subframe of mourning in silence.The subframe of mourning in silence also can be described as the sky frame, promptly on corresponding subframe position, closes the transmission of radio frequency.
Preferably, the descending sub frame or the sub-frame of uplink that are provided with near descending/up conversion interval specifically comprise for the subframe of mourning in silence: be provided with the 2n-1 layer the odd number unit frame near last descending sub frame of descending/up conversion interval for mourning in silence subframe; First sub-frame of uplink near descending/up conversion interval that the even number unit frame of 2n layer is set is the subframe of mourning in silence.
The present invention is owing to be provided with transitional region, thereby the base station downlink and uplink proportion of having eliminated different configuring areas is provided with the different interference problems that cause, and has guaranteed the coexistence of the base station of different downlink and uplink proportions configurations.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 shows the superframe structure of advising in the design of 16m frame structure in the prior art and forms sketch map;
Fig. 2 shows the flow chart according to the method for allocating downlink and uplink proportion that is used for wireless communication system of the embodiment of the invention;
Fig. 3 shows the sketch map according to different configuring areas in the preferred embodiment of the present invention and corresponding transitional region;
Fig. 4 shows according to the preferred embodiment of the invention the sketch map of two different configuring areas and corresponding double layered transition area;
Fig. 5 shows the sketch map of a solution of two different configuring areas coexistences of double layered transition area solution according to the preferred embodiment of the invention;
Fig. 6 shows according to the preferred embodiment of the invention the sketch map of two different configuring areas and corresponding 2N layer transitional region;
Fig. 7 shows the sketch map of a solution of two different configuring areas coexistences of 2N layer transitional region solution according to the preferred embodiment of the invention.
Embodiment
Below with reference to accompanying drawing and combine embodiment, specify the present invention.
Fig. 2 shows the flow chart according to the method for allocating downlink and uplink proportion that is used for wireless communication system of the embodiment of the invention, comprising: between adjacent two configuring areas with different downlink and uplink proportions, transitional region is set, specifically comprises,
Step S10 is provided with the number of plies of transitional region, and the number of plies is the twice of the difference of downlink or uplink number of sub frames in the different downlink and uplink proportions;
Step S20 is provided with every layer downlink and uplink proportion according to different downlink and uplink proportions.
Obviously, this method for allocating downlink and uplink proportion can be used for the for example WiMAX evolution system of TDD mode of wireless communication system.Design for agreement 16m frame structure; Characteristics according to uplink service ratio under the zones of different base station; Do not introducing under the prerequisite of disturbing between downlink and uplink between the base station, can be the different downlink/uplink ratio of base station configuration of the tdd mode of zones of different.
This WiMAX system that can solve present tdd mode disturbs for preventing up-downgoing; Require the whole network with the identical downlink and uplink proportion of frequency system configuration; It is insufficient to cause the frequency spectrum resource of some base station uplink or down link to utilize, perhaps the overweight problem of up link or downstream link overhead.
Preferably, step S10 specifically comprises: when difference is N, and N＜7 o'clock, the number of plies that transitional region is set is 2 * N layer; Wherein, when N=1, the number of plies that transitional region is set is 2 layers.
Preferably, adjacent configuring area comprises: first configuring area and second configuring area have first downlink and uplink proportion and second downlink and uplink proportion respectively; In transitional region; From near the layer of first configuring area to being numbered 1 to 2N near the layer of second configuring area; Step S20 specifically comprises: the downlink and uplink proportion of setting from layer 1 to layer 2N is for progressively to change to second downlink and uplink proportion from first downlink and uplink proportion; Wherein, promptly 2n layer and odd-level are that the downlink and uplink proportion of 2n-1 layer differs a sub-frame to even level; The 2n-1 layer is identical with the downlink and uplink proportion of 2n-2 layer, n≤N.
Preferably, the number of plies of transitional region is 2 layers, and step S20 specifically comprises: the downlink and uplink proportion that is provided with the 1st layer is first downlink and uplink proportion; The downlink and uplink proportion that is provided with the 2nd layer is second downlink and uplink proportion.
Preferably, between adjacent two configuring areas with different downlink and uplink proportions, transitional region is set and also comprises: the frame number of unit frame in according to every layer, the descending sub frame or the sub-frame of uplink that are provided with near descending/up conversion interval are the subframe of mourning in silence.The subframe of mourning in silence also can be described as the sky frame, promptly on corresponding subframe position, closes the transmission of radio frequency.
Preferably, the descending sub frame or the sub-frame of uplink that are provided with near descending/up conversion interval specifically comprise for the subframe of mourning in silence: be provided with the 2n-1 layer the odd number unit frame near last descending sub frame of descending/up conversion interval for mourning in silence subframe; First sub-frame of uplink near descending/up conversion interval that the even number unit frame of 2n layer is set is the subframe of mourning in silence.
Above-mentioned preferred embodiment is the subframe of mourning in silence owing to the downlink and uplink proportion that transitional region is set disposes and transitional region part subframe is set; Thereby the base station downlink and uplink proportion of having eliminated different configuring areas is provided with the different interference problems that cause, thereby has guaranteed the coexistence of the base station of different downlink and uplink proportion configurations.
In addition; The double transitional region design that preferred embodiment proposes; Through being arranged alternately descending sub frame and the regional mode of sub-frame of uplink in the adjacent transitional region layer for the subframe of mourning in silence; Can guarantee that the transitional region user can in time receive broadcast control message that send the descending sub frame position in the end; Access attempts can be carried out in first sub-frame of uplink position in the terminal that also can guarantee transitional region, has further reduced the influence to base station in the transitional region, the different coexistences of the base station of uplink ratio configuration down.
Fig. 3 shows the sketch map according to different configuring areas in the preferred embodiment of the present invention and corresponding transitional region; Comprise some configuring areas (configuring area 201, configuring area 202 and configuring area 203 etc.) with frequency 16m system, same configuring area refers to the base station and the base station that are in same region and has similar descending/uplink service proportion requirement.Configuring area 201; Configuring area 202 is different with configuring area 203 regions of living in; Be in Administrative Areas such as office building respectively, be in the bigger hot spot coverage of flow of the people such as airport or dining room, and be in the home dwelling zone; Business model under the zones of different has different features, causes the requirement of downlink traffic and uplink service different.Under tdd mode, descending/sub-frame of uplink ratio that the 16m system can be provided with is 7: 1,6: 2,5: 3,4: 4,3: 5,2: 6 and 1: 7, is applicable to different downlink/uplink business proportion requirements respectively.Identical downlink/uplink proportional arrangement is adopted in the inner base station of same configuring area, and configuring area 201, configuring area 202 and configuring area 203 inside are provided with a kind of descending/uplink proportion that is fit to this configuring area business statistics characteristics respectively.Between the different configuring areas transitional region is set, the descending/uplink proportion setting of transitional region is adopted in the base station of transitional region.Transitional region is confirmed the downlink/uplink ratio setting of this transitional region according to the descending/uplink proportion of adjacent configuring area.Between configuring area 201 and configuring area 202, transitional region 204 is set, between configuring area 201 and configuring area 203, transitional region 205 is set, between configuring area 202 and configuring area 203, transitional region 206 is set.If descending between configuring area 201 and the configuring area 202/uplink proportion configuration differs the sub-frame into N (N＞1 and N＜6), then transitional region 204 is the transitional region of 2N layer.If descending between configuring area 201 and the configuring area 203/uplink proportion configuration differs the sub-frame into N (N＞1 and N＜6), then transitional region 205 is the transitional region of 2N layer.If descending between configuring area 202 and the configuring area 203/uplink proportion configuration differs the sub-frame into N (N＞1 and N＜6), then transitional region 206 is the transitional region of 2N layer.
When the descending sub frame number that differs in the downlink and uplink between adjacent two configuring areas or sub-frame of uplink number are a sub-frame, can know that by above-mentioned preferred embodiment transitional region is double layered transition area, and is as shown in Figure 4.
Fig. 4 shows according to the preferred embodiment of the invention the sketch map of two different configuring areas and corresponding double layered transition area; Configuring area 301 has different down links and uplink service requirement with base station in the configuring area 302; The a little higher than configuring area 302 of the down link demand of configuring area 301; Descending/uplink proportion that base station in the configuring area 301 is set is M: 8-M (M>=2 and M≤7), and the descending/uplink proportion of the base station in the configuring area 302 is M-1: 9-M (M>=2 and M≤7).Double layered transition area is set: ground floor transitional region 303 and second layer transitional region 304 between configuring area 301 and configuring area 302.The base station descending/uplink proportion is set to identically with the descending/uplink proportion of base station in the bigger configuring area 301 of descending/uplink proportion in the transitional region 303, and the base station descending/uplink proportion is set to identical with the descending/uplink proportion of base station in the littler configuring area 302 of descending/uplink proportion in the transitional region 304.
Fig. 5 shows the sketch map of a solution of two different configuring areas coexistences of double layered transition area solution according to the preferred embodiment of the invention; The base station is descending in the transitional region 303/uplink proportion setting and configuring area 301 in the descending/uplink proportion of base station be provided with identically, the base station descending/uplink proportion is set to identical with the descending/uplink proportion of base station in the configuring area 302 in the transitional region 304.When the base station in the transitional region 303 was odd number at the frame number of unit frame, last descending sub frame that is provided with near descending/up conversion interval was the subframe of mourning in silence.When the base station in the transitional region 304 was even number at the frame number of unit frame, first sub-frame of uplink that is provided with near descending/up conversion interval was the subframe of mourning in silence.As shown in the figure; Descending/the uplink proportion of configuring area 301 was configured to 4: 4; And configuring area 302 descending/uplink ratio was configured to 3: 5, and the descending/uplink ratio of transitional region 303 was configured to 4: 4, and the descending/uplink ratio of transitional region 304 was configured to 3: 5.When the base station in the transitional region 303 was odd number at the frame number of unit frame, last descending sub frame 401 (descending sub frame 3) that is provided with near descending/up conversion interval 402 was the subframe of mourning in silence; When the base station in the transitional region 304 was even number at the frame number of unit frame, first sub-frame of uplink 403 that is provided with near descending/up conversion interval 402 was the subframe of mourning in silence.
Fig. 6 shows according to the preferred embodiment of the invention the sketch map of two different configuring areas and corresponding 2N layer transitional region; Descending between two different configuring areas (configuring area 501 and configuring area 502)/uplink proportion configuration differs the situation into N sub-frame (N＞1 and N＜6), the transitional region of 2N layer is set.As shown in the figure; Descending/uplink proportion the configuration of configuring area 501 and the descending/uplink proportion configuration of configuring area 502 differ 3 sub-frame; Descending/the uplink proportion of configuring area 501 is M: 8-M (M>=4 and M≤7), and the descending/uplink proportion of configuring area 502 is M-3: 11-M (M>=4 and M≤7).6 layers of transitional region are set: transitional region 503, transitional region 504, transitional region 505, transitional region 506, transitional region 507 and transitional region 508 between configuring area 501 and configuring area 502.Descending/the uplink proportion of base station progressively is changed to the descending/uplink proportion of a configuring area 502 in 6 layers of transitional region from the descending/uplink proportion of configuring area 501; Thereby, can not have descending/up interference problem that causes of sending simultaneously between the base station in disposed adjacent zone.Wherein, Descending/the uplink proportion of base station equals the descending/uplink proportion of base station in the configuring area 501 in the 1st layer of transitional region 503, and the descending/uplink proportion of base station equals the descending/uplink proportion of base station in the configuring area 502 in the 6th layer of transitional region.Descending/the uplink proportion of base station differs a sub-frame less than the descending/uplink proportion of base station in the 2n-1 layer transitional region in 2n layer (n≤3) transitional region; Identical descending/uplink proportion configuration is adopted in the base station of 2n-1 layer transitional region and 2n-2 layer transitional region.
Fig. 7 shows the sketch map of a solution of two different configuring areas coexistences of 2N layer transitional region solution according to the preferred embodiment of the invention; It is 6: 2 that base station in the configuring area 501 is provided with descending/uplink proportion, and it is 3: 5 that the base station in the configuring area 502 is provided with descending/uplink proportion.The base station descending/uplink proportion is set to 6: 2 in the transitional region 503; Descending/the uplink proportion of base station is set to 5: 3 in transitional region 504, the transitional region 505; Descending/the uplink proportion of base station is set to 4: 4 in transitional region 506, the transitional region 507; The base station descending/uplink proportion is set to 3: 5 in the transitional region 508; The zone 508 from transitional region 503 to transition, descending/uplink proportion is from 6: 2-＞5: 3-＞5: 3-＞4: 4-＞4: 4-＞3: 5, the base station descending/uplink proportion is gradually varied to the descending/uplink proportion of base station in the configuring area 502 from configuring area 501.When the base station in the transitional region 503 is odd number at the frame number of unit frame; Setting is the subframe of mourning in silence near last descending sub frame 601 (descending sub frame 5) of descending/up conversion interval 602; When the base station in the transitional region 505 is odd number at the frame number of unit frame; Setting is the subframe of mourning in silence near last descending sub frame 603 (descending sub frame 4) of descending/up conversion interval 602; When the base station in the transitional region 507 was odd number at the frame number of unit frame, last descending sub frame 604 (descending sub frame 3) that is provided with near descending/up conversion interval 602 was the subframe of mourning in silence; When the base station in the transitional region 504 is even number at the frame number of unit frame; Setting is the subframe of mourning in silence near first sub-frame of uplink 605 of descending/up conversion interval 602; When the base station in the transitional region 506 is even number at the frame number of unit frame; Setting is the subframe of mourning in silence near first sub-frame of uplink 606 of descending/up conversion interval 602; When the base station in the transitional region 504 was even number at the frame number of unit frame, first sub-frame of uplink 607 that is provided with near descending/up conversion interval 602 was the subframe of mourning in silence.
The present invention disposes and is arranged alternately transitional region part subframe through the following uplink ratio that transitional region is set and is the subframe of mourning in silence; Uplink ratio is provided with the interference problem that difference possibly cause under the base station of the different configuring areas of ability elimination, thereby has guaranteed the coexistence problems of the base station of different uplink ratio down configuration.Differ bigger situation for uplink ratio configuration under the disposed adjacent zone,, only have a sub-frame to be set to the subframe of mourning in silence in the base station of each layer transitional region, reduce influence base station performance in the transition sub-district through the transitional region of multilayer is set.In addition; The double transitional region design that the present invention proposes; Through being arranged alternately descending sub frame and the regional mode of sub-frame of uplink in the adjacent transitional region layer for the subframe of mourning in silence; Can guarantee that the transitional region user can in time receive broadcast control message that send the descending sub frame position in the end; Access attempts can be carried out in first sub-frame of uplink position in the terminal that also can guarantee transitional region, has further reduced the influence to base station in the transitional region, thereby has guaranteed the coexistence of the base station of different uplink ratio down configuration.
Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the storage device and carry out, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize by calculation element.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a method for allocating downlink and uplink proportion that is used for wireless communication system is characterized in that, between adjacent two configuring areas with different downlink and uplink proportions, transitional region is set, wherein,
The number of plies of said transitional region is set, and the number of plies is the twice of the difference of downlink or uplink number of sub frames in the said different downlink and uplink proportion;
According to said different downlink and uplink proportions every layer downlink and uplink proportion is set;
Wherein, said adjacent configuring area comprises: first configuring area and second configuring area have first downlink and uplink proportion and second downlink and uplink proportion respectively; In said transitional region; From near the layer of said first configuring area to being numbered 1 to 2N near the layer of said second configuring area; The downlink and uplink proportion that is provided with said every layer according to said different downlink and uplink proportions specifically comprises: downlink and uplink proportion from layer 1 to layer 2N is set for progressively changing to said second downlink and uplink proportion from said first downlink and uplink proportion; Wherein, the downlink and uplink proportion of 2n layer and 2n-1 layer differs a sub-frame; The 2n-1 layer is identical with the downlink and uplink proportion of 2n-2 layer, n≤N, and wherein, N is said difference;
Between adjacent two configuring areas with different downlink and uplink proportions, transitional region being set also comprises: the frame number of unit frame in according to every layer, the descending sub frame or the sub-frame of uplink that are provided with near descending/up conversion interval are the subframe of mourning in silence.
2. method for allocating downlink and uplink proportion according to claim 1 is characterized in that, the number of plies that said transitional region is set specifically comprises:
When said difference N＜7, the number of plies that said transitional region is set is 2 * N layer;
Wherein, when N=1, the number of plies that said transitional region is set is 2 layers.
3. method for allocating downlink and uplink proportion according to claim 1 is characterized in that, the number of plies of said transitional region is 2 layers, and the downlink and uplink proportion that is provided with said every layer according to said different downlink and uplink proportions specifically comprises:
The downlink and uplink proportion that is provided with the 1st layer is said first downlink and uplink proportion;
The downlink and uplink proportion that is provided with the 2nd layer is said second downlink and uplink proportion.
4. method for allocating downlink and uplink proportion according to claim 1 is characterized in that, the descending sub frame or the sub-frame of uplink that are provided with near descending/up conversion interval specifically comprise for the subframe of mourning in silence:
Be provided with the 2n-1 layer the odd number unit frame near last descending sub frame of descending/up conversion interval for mourning in silence subframe;
First sub-frame of uplink near descending/up conversion interval that the even number unit frame of 2n layer is set is the subframe of mourning in silence.
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| CN1784068A (en) * | 2004-11-30 | 2006-06-07 | 西门子（中国）有限公司 | Method for reducing interference between small zones in time-division synchronous CDMA cut-in system |
| CN1925361A (en) * | 2005-09-01 | 2007-03-07 | 大唐移动通信设备有限公司 | Method for crossing time slot distribution of resources in CDMA/time-division duplex system |
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| CN1784068A (en) * | 2004-11-30 | 2006-06-07 | 西门子（中国）有限公司 | Method for reducing interference between small zones in time-division synchronous CDMA cut-in system |
| CN1925361A (en) * | 2005-09-01 | 2007-03-07 | 大唐移动通信设备有限公司 | Method for crossing time slot distribution of resources in CDMA/time-division duplex system |
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