CN101772094B - Switching method in wireless communication system - Google Patents
Switching method in wireless communication system Download PDFInfo
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- CN101772094B CN101772094B CN200810246794A CN200810246794A CN101772094B CN 101772094 B CN101772094 B CN 101772094B CN 200810246794 A CN200810246794 A CN 200810246794A CN 200810246794 A CN200810246794 A CN 200810246794A CN 101772094 B CN101772094 B CN 101772094B
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Abstract
The invention provides a switching method in wireless communication system, comprising the following steps: a, a base station obtains the load information of an adjacent station; b, the base station periodically broadcasts the load information of the station and all other adjacent stations; c, a terminal judges the start of switching and selects the best switching base station according to the received load information of the base stations, the signal strength of the base stations obtained through periodically scanning, and the resource occupancy of the terminal. The invention adopts load balancing strategy; the terminal integrates the signal strength of the base stations and the load information to judge the start of the switching and select the best switching station, which leads the even distribution of the load between the base stations.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of switching method in wireless communication system.
Background technology
In wireless communication system, each base station realizes that the signal of a certain specific region covers, and the terminal in this zone and this base station communicate.Then under actual conditions, the terminal can be in a plurality of base stations overlapping covered, receives a plurality of signal of base station, and usually, the base station communication the strongest with signal strength signal intensity can be selected in the terminal.Consider that from macroscopic view this single strategy may cause the laod unbalance between each base station.
Summary of the invention
In order to address the above problem, the present invention proposes a kind of switching method in wireless communication system, comprise following steps:
A. the base station obtains the load information of adjacent base station;
B. the load information of this base station and all adjacent base stations is periodically broadcasted in the base station;
C. the terminal is according to the load information of each base station of receiving, each signal of base station intensity that periodic scan obtains, and the terminal own resources take situation, judges whether to initiate to switch, and selects best base station shifting.
Further, among the step a, the load information of base station comprises: the base station available horsepower, can use/the downlink sub-channels number, base station subordinate's terminal number; Can further include all terminals of subordinate, base station on/descending minimum bandwidth summation, all terminals of subordinate, base station on/descending bandwidth on demand summation.
Further, among the step b, the cycle of base station broadcast load information is variable, and is relevant with the load information number of adjacent base station number and selection.
Further, among the step c, said terminal own resources take situation and comprise: base station assigns is given bandwidth and power, the minimum bandwidth at terminal and the bandwidth on demand at terminal at terminal.The priority that the minimum bandwidth at said terminal obtains in the time of can be by the type of service of terminal to apply and terminal unit contractual network determines jointly.
Preferably, in the method, the terminal can also obtain the descending interference strength of each base station simultaneously according to periodic scan, judge whether to initiate to switch, and select best base station shifting, and concrete steps comprise:
1., then get into step 3, otherwise get into step 2 if current base station is given the bandwidth on demand of the bandwidth of terminal distribution less than the terminal;
2. according to the available resources of current base station tolerance, judge whether current base station is in busy condition, if busy then get into step 3, otherwise would not do not initiate switching;
3. all signal strength signal intensities are higher than predetermined threshold; And the difference of signal strength signal intensity and interference strength is formed a station list greater than the adjacent base station of predetermined threshold; The purpose base station of adopting a unique service indicia point to switch simultaneously is predisposed to the sensing current base station with this service mark, gets into step 4;
4., then get into step 5, otherwise get into step 7 if station list is not empty;
5. from said station list, select one and receive the highest adjacent base station of signal strength signal intensity; According to the available resources tolerance of this neighbour base station with the base station of service indicia point, whether judgement should satisfy switching condition in the neighbour base station: the available resources tolerance of the base station that available resources tolerance in adjacent base station is pointed to greater than service mark and difference are greater than predetermined threshold 1; In station list, delete adjacent base station simultaneously; If satisfy switching condition, then get into step 6, otherwise, return step 4.
6. the table tennis for fear of the terminal switches; Occupation condition according to signal of base station intensity, interference profile, load information and this terminal; After estimation switches to adjacent base station; Base station that service mark points to and the available resources of adjacent base station tolerance, whether judgement should satisfy reverse switching condition in the neighbour base station: the available resources tolerance of the base station that service mark pointed to after estimation switched is greater than the available resources tolerance of this neighbour base station, and difference is greater than predetermined threshold 2; If satisfy reverse switching condition, then return step 4; Otherwise service mark is pointed to should the neighbour base station, with the available resources tolerance that switches to the base station that the available resources tolerance behind this neighbour base station points to as service mark of estimation, as the basis of follow-up judgement, returns step 4 then.
The predetermined threshold 1 of switching condition is higher than the predetermined threshold 2 of reverse switching condition.
7., then do not initiate to switch if service mark points to current base station; Otherwise, switch to service mark base station pointed.
Further, the predetermined threshold 1 of above-described switching condition is higher than the predetermined threshold 2 of reverse switching condition.
Further, the busy not busy degree of above-described available resources tolerance indication base station can be obtained by the load information parameter combinations.
The present invention adopts load balancing strategy, behind comprehensive each signal of base station intensity in terminal and the load information, judges and initiates to switch and select best base station shifting, can make to load between each base station to be evenly distributed.
Description of drawings
Fig. 1 is the network diagram of one four base station in the embodiment of the invention;
Fig. 2 is the schematic flow sheet that switching is initiated at the terminal under the base station 1 in the embodiment of the invention;
Fig. 3 is the schematic of the load information that receive at the terminal under the base station 1 in the embodiment of the invention;
Fig. 4 is the schematic as a result of nearest three signal strength signal intensities scanning in terminal in the embodiment of the invention;
Fig. 5 is the schematic as a result of nearest three interference strengths scanning in terminal in the embodiment of the invention;
Fig. 6 switches and selects the schematic flow sheet of best base station shifting according to initiations such as signal power and base station load informations for terminal in the embodiment of the invention.
Embodiment
Specify embodiment of the present invention below in conjunction with accompanying drawing.
In the specific embodiment of the present invention, as shown in Figure 1,4 base stations are arranged in the network, the base station label is respectively 1,2, and 3,4. Base station 2,3,4 all is the adjacent base station of base station 1, then the flow process of the initiation of the terminal under the base station 1 switching is as shown in Figure 2.Base station 1 periodically is handed down to all terminals of this base station through broadcast with the load information of this base station and adjacent base station, and it is as shown in Figure 3 to suppose that terminal under the base station 1 receives up-to-date load information; The measurement of terminal periodic property each signal of base station intensity and interference strength suppose that nearest each signal of base station intensity and the interference strength of scanning for three times in this terminal is respectively like Fig. 4 and shown in Figure 5; In certain particular frame (as: mod (current frame number-access frame number, 1000)=0), the terminal takies situation according to each signal of base station intensity, interference strength, load information and terminal own resources, judges whether to initiate to switch, and selects best base station shifting.
Whether terminal judges is initiated to switch and is selected the idiographic flow of best base station shifting as shown in Figure 6.Suppose that current base station is that the bandwidth on demand of the bandwidth of terminal distribution greater than the terminal given in base station 1, then at first according to the available resources tolerance that is base station 1, judges its busy not busy degree; Can be known that by Fig. 3 the most of power and the subchannel of base station 1 are all occupied, the terminal number under the base station 1 is also more; The base station is in busy condition, so check the information of adjacent base station, can be known by Fig. 4 and Fig. 5; Base station 2,3,4 signal strength signal intensity all is higher than predetermined threshold (90dB) in nearest three scannings; And the difference of signal strength signal intensity and interference strength all greater than predetermined threshold (15dB), then with base station 2,3; 4 form a station list, adopt a unique service mark simultaneously, and being predisposed to and pointing to current base station is base station 1.
The highest base station 2 of selective reception signal strength signal intensity from station list, deletion base station 2 in station list, judge again whether it satisfies switching condition, and concrete steps are following:
If a. the available horsepower of adjacent base station is higher than the base station that service mark points to, and difference then gets into step e greater than predetermined threshold (500mw), otherwise gets into step b;
If b. the using of adjacent base station/downlink sub-channels is all many than the base station that service mark points to, and difference then gets into step e greater than predetermined threshold (20), otherwise gets into step c;
If c. the base station pointed to of service mark on/all neighbour base station of descending minimum bandwidth is high; And difference greater than predetermined threshold (be made as here base station that service mark points on/descending minimum bandwidth is greater than 2 times of adjacent base station); Then get into step e, otherwise get into steps d;
If d. the base station pointed to of service mark on/all neighbour base station of descending bandwidth on demand is high; And difference greater than predetermined threshold (be made as here base station that service mark points on/descending bandwidth on demand is greater than 2 times of adjacent base station); Then get into step e, otherwise from station list, reselect the base station;
E. judge whether that table tennis can take place to be switched: the load information after the base station of pointing to according to service mark and the estimations such as load information, signal strength signal intensity, interference strength and terminal request bandwidth of this neighbour base station switch; If the load information after switching does not satisfy reverse load balance switching condition (a or borc or d); Then service mark being pointed to should the neighbour base station; Estimation switched to available resources tolerance behind this neighbour base station as the basis of follow-up judgement; Return station list then and select the base station, continue to carry out switching judging; Otherwise, directly return station list and select the base station, continue to carry out and judge.
Concrete, for base station 2, condition a, b, c, d do not satisfy, and from the base station 3 and base station 4 of station list, select the highest base station 3 of signal strength signal intensity, in station list, delete base station 3, judge simultaneously whether it satisfies switching condition.
For base station 3, a that satisfies condition is so enter into step e; Calculate the load information after switching, suppose that it is 100mw that current terminal takies power, up-downgoing subchannel number is respectively 5 and 10; The up-downgoing minimum bandwidth all is 20kbps, and the up-downgoing bandwidth on demand all is 200kbps, then because the average signal strength of base station 3 and base station 1 is respectively-75dbm and-85dbm; Then can estimate switch to base station 3 after, the descending power that the terminal needs is 100 * 10
(75-(85))/10=1000mw, up-downgoing subchannel still are 5 and 10, then can calculate the available descending power that switches base station 1, back and 3 and be respectively 100+100=200mw, 3000-1000=2000mw; In like manner base station 1 and 3 use (descending) row subchannel are 25 (12), 195 (140); Going up (descending) row smallest allocation of bandwidth is 0.98Mbps (0.98Mbps), 0.42Mbps (0.52Mbps), and going up (descending) row bandwidth on demand is 3.8Mbps (4.8Mbps), 2.2Mbps (2.2Mbps), with load information and the condition a after switching; B; C, d do contrast and can know, the satisfied reverse switching condition of base station 1 that switches back again in base station 3; So; Service mark is pointed to base station 3, the available descending power 2000mW of the base station 3 after the switching that will estimate simultaneously, can use (descending) row subchannel 195 (140), go up (descend) row smallest allocation of bandwidth 0.42Mbps (0.52Mbps) and last (descending) row bandwidth on demand is the basis of 2.2Mbps (2.2Mbps) as follow-up judgement, return station list then.
At this moment, also have base station 4 in the station list, then select base station 4, and in station list, delete base station 4, judge again whether it satisfies switching condition.For base station 4, the c that satisfies condition so enter into step e, calculates the load information switch to behind the base station 4, can estimate switch to base station 4 from base station 3 after, the descending power that the terminal needs is 1000 * 10
(85-(87))/10=1600mw, up-downgoing subchannel still are 5 and 10, then can calculate the available descending power that switches base station 3, back and base station 4 and be respectively 1000+2000=3000mw, 2000-1600=400mw; In like manner base station 3 and base station 4 to use (descend) row subchannel be 200 (150), 95 (40), going up (descend) row smallest allocation of bandwidth is 0.4Mbps (0.5Mbps), 0.22Mbps (0.22Mbps), upward (descending) to go bandwidth on demand be 2Mbps (2Mbps), 1.2Mbps (1.2Mbps); With load information and the condition a after switching, b, c; D does contrast and can know; Reverse switching condition a is satisfied in base station 4, and promptly base station 3 can oppositely be switched go back in base station 4, so directly return station list.This moment, station list was empty, and service mark points to base station 3, rather than current base station (base station 1), so the terminal switches to base station 3.
Further, through to condition a, b, c, the selection of each threshold value among the d can realize load balance in various degree between each base station.In fact, when judging whether oppositely to switch according to the load information after switching, condition a, b, c, the thresholding the when threshold setting of d can be switched than forward is lower, to guarantee that the terminal table tennis can not take place switches.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a switching method in wireless communication system is characterized in that, comprises following steps:
A. the base station obtains the load information of adjacent base station;
B. the load information of this base station and all adjacent base stations is periodically broadcasted in the base station;
C. the terminal is according to the load information of each base station of receiving, each signal of base station intensity and the descending interference strength that periodic scan obtains, and the terminal own resources take situation, judges whether to initiate to switch, and selects best base station shifting; Be specially:
If c.1. current base station is given the bandwidth on demand of the bandwidth of terminal distribution less than the terminal, then get into step c 3, otherwise get into step c 2;
C.2. according to the available resources of current base station tolerance, judge whether current base station is in busy condition, if busy then get into step c 3, otherwise would not do not initiate switching;
C.3. all signal strength signal intensities are higher than the difference of predetermined threshold and signal strength signal intensity and interference strength station list of adjacent base station composition greater than predetermined threshold, adopt the unique service mark, preset the sensing current base station;
If c.4. station list is not empty, then gets into step c 5, otherwise get into step c 7;
C.5. from station list, select the adjacent base station that signal strength signal intensity is the highest, according to the available resources tolerance of this neighbour base station and the base station of service indicia point, whether judgement should satisfy switching condition in the neighbour base station, and deletion should the neighbour base station in station list simultaneously; Said switching condition is the available resources tolerance of adjacent base station available resources tolerance greater than the base station of service mark sensing, and difference is greater than predetermined threshold 1;
C.5.1 if satisfy switching condition, then get into step c 6;
C.5.2 if do not satisfy switching condition, then return step c 4;
C.6. according to the occupation condition at base station signal strength, interference profile, load information and this terminal; After estimation switches to this neighbour base station; Base station that service mark points to and the available resources of this neighbour base station tolerance, whether judgement should satisfy reverse switching condition in the neighbour base station; Said reverse switching condition is the available resources tolerance of base station estimation, that the back service mark that switches the points to available resources tolerance greater than this neighbour base station estimation, after switching, and difference is greater than predetermined threshold 2;
C.6.1 if satisfy reverse switching condition, then return step c 4;
C.6.2 if do not satisfy reverse switching condition; Then service mark being pointed to should the neighbour base station; With the available resources tolerance that switches to the base station that this neighbour base station available resources tolerance behind this neighbour base station points to as step c 5 described service marks of estimation, return step c 4 then;
If c.7. service mark points to current base station, then do not initiate to switch; Otherwise, switch to the base station that service mark points to.
2. method according to claim 1 is characterized in that step a, and the load information of base station comprises: base station available horsepower, can use/downlink sub-channels number and base station subordinate's terminal number.
3. method according to claim 1; It is characterized in that step a, the load information of base station comprises: the base station available horsepower, can use/the downlink sub-channels number, base station subordinate's terminal number, all terminals of subordinate, base station on/descending minimum bandwidth summation and all terminals of subordinate, base station on/descending bandwidth on demand summation.
4. method according to claim 1 is characterized in that step b, and the cycle of base station broadcast load information is variable, and is relevant with the load information number of adjacent base station number and selection.
5. method according to claim 1 is characterized in that step c, and said terminal own resources take situation and comprise: base station assigns is given bandwidth and power, the minimum bandwidth at terminal and the bandwidth on demand at terminal at terminal.
6. method according to claim 5 is characterized in that, the priority that the minimum bandwidth at said terminal obtains during by the type of service of terminal to apply and terminal unit contractual network determines jointly.
7. method according to claim 1 is characterized in that, the predetermined threshold 1 of described switching condition is higher than the predetermined threshold 2 of reverse switching condition.
8. according to claim 1 and one of 7 described methods, it is characterized in that the busy not busy degree of said available resources tolerance indication base station is obtained by the load information parameter combinations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810246794A CN101772094B (en) | 2008-12-31 | 2008-12-31 | Switching method in wireless communication system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810246794A CN101772094B (en) | 2008-12-31 | 2008-12-31 | Switching method in wireless communication system |
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| CN101772094A CN101772094A (en) | 2010-07-07 |
| CN101772094B true CN101772094B (en) | 2012-10-03 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102572950B (en) * | 2010-12-30 | 2016-03-30 | 中国移动通信集团设计院有限公司 | Residence reselecting, device and system |
| CN102843735B (en) * | 2011-06-21 | 2018-03-23 | 中兴通讯股份有限公司 | Cell switching method and system |
| CN102695229B (en) * | 2012-06-13 | 2015-02-04 | 中国科学院微电子研究所 | Method and device for realizing service base station switching in WiMAX network |
| CN102811469B (en) * | 2012-07-25 | 2018-08-07 | 南京中兴软件有限责任公司 | A kind of Poewr control method and device |
| CN104469861B (en) * | 2013-09-24 | 2019-12-24 | 中兴通讯股份有限公司 | Cell selection method, device and terminal |
| US10887805B2 (en) * | 2016-04-01 | 2021-01-05 | Htc Corporation | Device and method of handling handover |
| CN107592659A (en) * | 2016-07-08 | 2018-01-16 | 北京信威通信技术股份有限公司 | A kind of method and device of terminal switching |
| WO2020155051A1 (en) * | 2019-01-31 | 2020-08-06 | Qualcomm Incorporated | Mobility load balancing in wireless communication network |
| CN110557780A (en) | 2019-05-16 | 2019-12-10 | Oppo广东移动通信有限公司 | power consumption control method and device of terminal and storage medium |
| CN110324869B (en) * | 2019-06-04 | 2021-08-17 | 中国联合网络通信集团有限公司 | A user access method and base station |
| CN110855795B (en) * | 2019-11-21 | 2022-03-08 | 中铁二十局集团第三工程有限公司 | Information transmission method and system for construction of ultra-high and large-span welding ball joint net rack |
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