CN101098552A - Method for mobile unit to determining candidate servo base station - Google Patents
Method for mobile unit to determining candidate servo base station Download PDFInfo
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- CN101098552A CN101098552A CNA2006100941693A CN200610094169A CN101098552A CN 101098552 A CN101098552 A CN 101098552A CN A2006100941693 A CNA2006100941693 A CN A2006100941693A CN 200610094169 A CN200610094169 A CN 200610094169A CN 101098552 A CN101098552 A CN 101098552A
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Abstract
The invention relates to a method of mobile unit for deciding candidate servo base station, wherein in a base station cell reselection program, a mobile unit is communicated with a wireless network via a servo base station, the wireless network comprises a servo base station and a plurality of nearby base stations. And the method comprises that checking the signal strengths of a plurality of nearby base stations, selecting N nearby base stations with strongest signal strengths, checking the signal strengths of a plurality of nearby base stations, and respectively adding one weighting value on the signal strengths of the selected N nearby base stations as the signal strengths of the N nearby base stations, selecting N nearby base station with strongest signal strengths.
Description
Technical field
The present invention relates to a kind of mobile unit and select the method for base station again, especially relate to a kind of method that determines candidate servo base station.
Background technology
Because the development of wireless communication system technologies, personal mobile communication has become some indispensable in modern's daily life.Also,, all can utilize getting in touch with of mobile unit at any time, not be subjected to the restriction in time place with other people as long as be in the signal of communication covering scope of mobile communication system because popularizing of mobile unit makes interpersonal communication become convenient and simple.
Include a plurality of base station area (Cell) that communication service is provided by a base station (Base Station) respectively in the wireless communication system, because these a plurality of base station area adjoin each other with the favous framework of class usually, therefore, wireless communication system also is called as cellular wireless communication system often.For the purpose of simplifying the description, see also the schematic diagram of a shown wireless communication system among Fig. 1.
Wireless network communications system 1 comprises a mobile unit (Mobile Subscriber, MS) 16, one base station 12 and another base station 14 among Fig. 1.Wherein, mobile unit 16 is used for transmitting and receives wireless communication signals and communicates with each other to be connected wireless network with the base station, and base station 12 is to produce a base station area 121, and base station 14 is to produce a base station area 141 so that communication service to be provided.
Be in simultaneously in the service range of base station area 121 and base station area 141 owing to mobile unit 16 herein, mobile unit 16 is the signal of transceiver base station 12 and base station 14 simultaneously, when mobile unit 16 starts, will carry out the program that base station area is selected (Cell Selection), according to two base stations 12,14 send the signal of broadcasting control channel (BCCH), make mobile unit decision loss of transmission paths door (Pathloss criterion) C1 and two reference values of honeycomb gravity treatment door (Cell reselection criterion) C2, and in order to judge and to select base station area, to login (camp on) servo base station zone and to start ensuing work as servo base station zone (Serving Cell).Generally speaking, servo base station is with respect to mobile unit 16, has the servo base station that positive C1 value and the highest C2 value are considered to the best.
According to ETSI 05.08 defined, after mobile unit finishes the base station area option program and logins servo base station, for mobile unit is remained in the optimal base station area, after mobile unit has been logined a servo base station, at set intervals, mobile unit can detect a plurality of base station contiguous in the public land mobile net network and send the program that the signal magnitude of broadcasting control channel is carried out base station area gravity treatment (CellReselection).
In base station area gravity treatment program, mobile unit will continue to measure the broadcasting control channel signal strength of all neighbor base stations in the broadcasting control channel configuration list (BAlist), and find out six neighbor base stations that wherein signal strength signal intensity is the strongest as six candidate servo base stations, and upgrade the C2 value of servo base station and candidate servo base station simultaneously, to find out optimal at that time base station as new servo base station.
And for the C2 value of calculated candidate servo base station, mobile unit must read the broadcasting control channel signals information of candidate servo base station, but for deciphering broadcasting control channel information that can be correct, before reading information, frequency correction bursts (FB) that must finish synchronous action earlier, reads base station area and Synchronization Burst (SB), with emending frequency and temporal error, the broadcasting colour coding (BSIC) that also reads the base station is in passing learnt the identification code of base station area well.
The program of base station area gravity treatment continues to carry out, and mobile unit is the result of update signal measurement as much as possible, in case select servo base station after finding have new BCCH signal to become six, finish the action of reading this new broadcasting control channel information in 30 seconds.
But when meeting ETSI 05.08 regular fully, may have following situation and take place.Because mobile unit is finished in each action that measures neighbor base station, and repay this measurement and give communication protocol stack (Protocol Stack), communication protocol stack is measurement and before signal strength signal intensity (rxlev) mean value of accumulative total according to this just, recalculate the signal strength signal intensity mean value of each neighbor base station in the broadcasting control channel configuration list, and find out six wherein the strongest neighbor base stations (not comprising servo base station) as candidate servo base station interior.
Come the 6th and the 7th 's neighbor base station when signal strength signal intensity, its signal strength signal intensity mean value very near the time, can be easy to take place because the variation of transient signals intensity, and become the 6th candidate servo base station in turn, this causes mobile unit to go to have read broadcasting control channel signals information more to I haven't seen you for ages, if just become one neighbor base station of candidate servo base station, distance is that time of candidate servo base station was above 30 seconds the last time, then also need to read earlier the frequency correction bursts (FB) and Synchronization Burst (SB) of base station area, with emending frequency and temporal error, to guarantee correctly to understand the signal of broadcasting control channel.
When the signal strength signal intensity mean value of a plurality of neighbor base stations all very approaching, at this moment, these a plurality of neighbor base stations all can have an opportunity to become candidate servo base station very much, in case the replacing that candidate servo base station is frequent, just can cause mobile unit to proofread and correct burst (FB) and Synchronization Burst information such as (SB) at these neighbor base station reading frequencies always, cause the waste of power supply.
Please refer to Fig. 2, is the schematic diagram of prior art mobile unit base station area gravity treatment program.As previously mentioned, the program that mobile unit will carry out the base station area gravity treatment at set intervals, and the first six neighbor base station that intensity is the strongest is made as candidate servo base station 18, the signal strength signal intensity mean value of candidate servo base station that mobile unit receives is shown in S21 among the figure, according to its strong and weak sequence arrangement, be six base stations of NC1～NC6 in regular turn, it is made as candidate servo base station 18, and signal strength signal intensity comes the 7th neighbor base station NC7, and its signal strength signal intensity mean value is very near the 6th neighbor base station NC6.
Through after a while, upgrade the measuring value of each neighbor base station as process S22 mobile unit, this moment, the temporary transient neighbour near base station NC7 that becomes of signal strength signal intensity of neighbor base station NC6 was low, so NC7 becomes one of new candidate servo base station 18, and then mobile unit will read the broadcasting control channel information of NC7.Yet at next process S23, mobile unit upgrades the measuring value of each neighbor base station, and this moment, the signal strength signal intensity of NC6 was higher than NC7 again once again, became one of candidate servo base station 18 again, and mobile unit will read the broadcast channel information of NC6 more again according to standard.
As shown in Figure 2 in the base station area reuse adoption process, it is the same beginning with last candidate servo base station, but in process S22, mobile unit once removed to have read the broadcast channel information of NC7, as: FB, SB... etc., with the result, this action is not very necessary, because of (frequency of upgrading measurement signal on mobile unit is decided) may just take place once in such situation in the several seconds, therefore, mobile unit can be carried out base station area gravity treatment several times, and such process can consume many power.In fact, for such situation, mobile unit can read the information of the candidate servo base station that changes always, because the change of in fact last several candidate servo base stations, can't influence the communication quality of mobile unit.
Yet the method with existing base station area gravity treatment can't solve this problem.Be the invention provides a kind of method that determines candidate servo base station, to avoid mobile unit in the base station area reuse adoption process, to need to read the information that servo base station is selected in change often.
Summary of the invention
The object of the present invention is to provide the method for decision candidate servo base station, make mobile unit when the base station area gravity treatment, candidate servo base station can be because of the change of of short duration signal, and changes thereupon, changes.
A kind of method of mobile unit to determining candidate servo base station is in base station area gravity treatment (cellreselection) program, this mobile unit is via a servo base station and a wireless communication, this wireless network comprises servo base station and a plurality of neighbor base station, and method comprises the following step: the signal strength signal intensity that detects a plurality of neighbor base stations; Choose N the neighbor base station that wherein signal strength signal intensity is the strongest; Write down N the strongest neighbor base station in the candidate servo base station list; Signal strength signal intensity to N neighbor base station in the candidate servo platform list increases the signal strength signal intensity of a weighted value as an above-mentioned N neighbor base station respectively.
Description of drawings
Fig. 1 is the schematic diagram of prior art one wireless network communications system;
Fig. 2 is the schematic diagram of prior art one mobile unit base station area gravity treatment program;
Fig. 3 is the schematic diagram of one embodiment of the invention mobile unit base station area gravity treatment;
Fig. 4 is the flow chart of one embodiment of the invention mobile unit base station area gravity treatment program.
The reference numeral explanation
The 1-wireless network communications system
The 16-mobile unit
18-candidate servo base station list
12,14-base station
121,141-base station area
NC1, NC2 ..., N neighbor base station of NCN-
Embodiment
In order to solve the previous problem that runs into unnecessary base station area gravity treatment, and reduce candidate servo base station change number of times to reduce power consumption, the invention provides a kind of method that determines candidate servo base station of mobile unit, carry out in the base station area reuse adoption process at mobile unit, the signal strength signal intensity of listing a plurality of neighbor base stations in the candidate servo base station list in is added a weighted value respectively, change the signal strength signal intensity of candidate servo base station, to avoid change because of transient signals intensity, and change candidate servo base station always, make candidate servo base station in judging flow process, be difficult for change.
Mobile unit is finished in each action that measures neighbor base station, calculate the signal strength signal intensity mean value of each neighbor base station in the broadcasting control channel configuration list, and find out six wherein the strongest neighbor base stations (not comprising servo base station) as candidate servo base station interior.In the present invention, the signal strength signal intensity that has belonged to each neighbor base station in the candidate servo base station list at present can be added a weighted value (Hysteresis) respectively.This weighted value only in all neighbor base station signal strength signal intensities relatively, just adds weighted value during the decision candidate servo base station, does not influence actual signal strength signal intensity.
Please refer to Fig. 3 is a kind of schematic diagram that makes the mobile unit to determining candidate servo base station method of the embodiment of the invention.The action that measures a plurality of neighbor base stations at initial step S31 mobile unit is finished, obtain six the strongest neighbor base station NC1-NC6 of signal strength signal intensity and be made as candidate servo base station 18, and have the signal strength signal intensity mean value of 5 neighbor base station NC6-NC10 very approaching, and the signal strength signal intensity of these 5 neighbor base stations is the 6th to the 10th in proper order.In the present invention, candidate servo base station 18 added a weighted value 5dB respectively after, as the signal strength signal intensity of candidate servo base station 18.
After a scheduled time, follow step S32, mobile unit upgrades measurement, and the signal strength signal intensity that adds weighted value with the selected candidate servo base station 18 of step S31 is as the foundation of differentiating, whether the signal strength signal intensity of the signal strength signal intensity of other neighbor base station above candidate servo base station 18 is arranged, to upgrade the list of candidate servo base station 18.Every a scheduled time, mobile unit will upgrade measurement as step S33 etc., to upgrade the signal strength signal intensity mean value of neighbor base station at any time afterwards.
In the above-described embodiments, if when not having the weighted value of increasing as the prior art mobile unit, the 7th to the 10th neighbor base station all has an opportunity to become the 6th candidate servo base station very much, when step S32, the 9th neighbor base station NC9 promptly replaces the 6th neighbor base station NC6, become one of new candidate servo base station 18, mobile unit will read the broadcast channel information of NC9; Yet at next process S33, mobile unit upgrades the measuring value of each neighbor base station, and this moment, the signal strength signal intensity of NC6 was higher than NC9 again once again, became one of candidate servo base station 18 again, and mobile unit will read the broadcast channel information of NC6 more again according to standard.In case the 6th the frequent replacing of candidate servo base station just can cause mobile unit to proofread and correct burst (FB) and Synchronization Burst information such as (SB) at these neighbor base station reading frequencies, causes the waste of power supply always.
Yet, the present invention is at the foregoing description step S31, behind the mobile unit to determining candidate servo base station 18, each neighbor base station in the candidate servo base station is added a weighted value 5dB respectively, signal strength signal intensity as the candidate servo base station of candidate servo base station when the comparison signal intensity, make the follow-up base station area gravity treatment program of carrying out at set intervals, select the signal of servo base station to add weighted value foundation as a comparison later on.
So at step S32, even if the signal strength signal intensity mean value of the 9th neighbor base station NC9 is higher than the signal strength signal intensity mean value of original the 6th neighbor base station NC6, but because of the mean value of NC6 adds that weighted value 5dB just is considered as signal strength signal intensity, therefore the signal strength signal intensity of NC9 there is no the signal strength signal intensity that exceeds NC6, is still to be one of candidate servo base station 18 with NC6.
At next process S33, mobile unit upgrades the measuring value of each neighbor base station, the signal strength signal intensity of also not having other neighbor base station this moment is higher than the signal strength signal intensity of NC6, therefore candidate servo base station 18 is in step S31 to S33 and no change, and mobile unit will need not consume the broadcast channel information that many power removes to read other neighbor base station.
Please refer to Fig. 4, is the flow chart of a kind of mobile unit to determining candidate servo base station method of one embodiment of the invention.Mobile unit is carried out base station area gravity treatment program in step S41.And then step S42 mobile unit detects the signal strength signal intensity of a plurality of neighbor base stations, upgrades the value of neighbor base station signal strength signal intensity.Step S43 chooses the strongest N of a signal strength signal intensity neighbor base station among a plurality of neighbor base stations of detect.Step S44 logins N the neighbor base station of step S43 in the candidate servo base station list.
Step S45 waits a scheduled time.Step S46, mobile unit detect a plurality of neighbor base stations again, upgrade the signal strength signal intensity of neighbor base station.Step S47 adds a weighted value respectively with the signal of base station intensity on the candidate servo base station list, and will add that numerical value after the weighted value is as the signal strength signal intensity of representing candidate servo base station (a strongest N neighbor base station before the renewal).Step S48 chooses and upgrades N the strongest neighbor base station of back signal strength signal intensity, compares with the candidate servo base station list, judges whether to conform to.If be consistent, carry out step S491, keep former candidate servo base station list; If do not conform to, then carry out step S492, with N the neighbor base station of step S48 more new login in the candidate servo base station list.Step S410, mobile unit with among the cancellation step S47 to the weighting of N neighbor base station in the candidate servo base station list, and repeating step S45 is to step S48.
Above-mentioned for arbitrary embodiment in, wherein can be set between the 3dB to 5dB be a preferred range to weighted value, its above embodiments are all represented as weighted value with 5dB.And the N value in Fig. 4 embodiment can change according to the actual set of mobile unit, and general mobile unit set is N=6.Again in the above-described embodiments, mobile unit is when detecting the signal strength signal intensity of a plurality of neighbor base stations, all can upgrade the signal strength signal intensity of servo base station simultaneously, if the signal strength signal intensity of the signal strength signal intensity of any neighbor base station greater than servo base station arranged, then mobile unit will make this neighbor base station be updated to new servo base station.
In the determination methods of base station area gravity treatment formerly, when signal strength signal intensity is very close between the part candidate servo base station of a mobile unit and the neighbor base station, this mobile unit can constantly be carried out candidate servo base station and upgrade, and repeatedly the renewal of Shuoing has consumed many power virtually.Yet, the action of these renewals is being unnecessary in such cases, what become servo base station because of really having an opportunity is the stronger candidate servo base station of intensity, but not the candidate servo base station of the approaching general neighbor base station of the several signal strength signal intensities in back, even if do not upgrade the candidate servo base station of back, still can obtain good communication quality.Therefore, these candidate servo base stations that repeatedly update signal intensity the is lower and power that consumes is unnecessary power dissipation.
Determination methods compared to existing base station area gravity treatment, the present invention makes mobile unit lower unnecessary replacing candidate servo base station, in the process of base station area gravity treatment, in candidate servo base station, increase by a weighted value, Rule of judgment, the flow process of mobile unit have been changed, therefore, when mobile unit when judging whether to change candidate servo base station, tighter condition restriction is only arranged, avoided as previously mentioned in unnecessary situation or excessively changed the problem of candidate servo base station, had the advantage of saving power.
Though the present invention illustrates as above with preferred embodiment, so it is not in order to limit spirit of the present invention and invention entity.Usually know the knowledgeable to having in the affiliated technical field, when understanding and utilize other assembly or mode to produce identical effect easily.Be with, the modification of being done in without departing from the spirit or scope of the invention all should be included in the following claim.
Claims (7)
1. the method for a mobile unit to determining candidate servo base station, this mobile unit is via a servo base station and a wireless communication, and this wireless network comprises this servo base station and a plurality of neighbor base station, and this method comprises the following step:
(a) detect the signal strength signal intensity of these a plurality of neighbor base stations;
(b) choose N the strongest neighbor base station of signal strength signal intensity in these a plurality of neighbor base stations;
(c) detect the signal strength signal intensity of these a plurality of neighbor base stations, and the signal strength signal intensity of the selected N of step (b) neighbor base station is increased the signal strength signal intensity of a weighted value as an above-mentioned N neighbor base station respectively; And
(d) after step (c), choose N the neighbor base station that wherein signal strength signal intensity is the strongest.
2. the method for claim 1, this mobile unit comprises a candidate servo base station list, this method more comprises:
(e) in step (b), this N the neighbor base station of choosing is recorded in this candidate servo base station list;
(f) in selected N neighbor base station and step (b) in the step (d) selected N neighbor base station not simultaneously, upgrading this candidate servo base station list is N selected in the step (d) neighbor base station.
3. the method for claim 1 more comprises:
(g) detect the signal strength signal intensity of this servo base station;
(h) step (d) when the signal of the strongest neighbor base station of signal greater than the signal strength signal intensity of this servo base station then this mobile unit make this neighbor base station become this new servo base station.
4. the method for claim 1, wherein this step (c) more comprises:
Wait a scheduled time.
5. the method for claim 1, wherein the scope of this weighted value is 3dB to 5dB.
6. the method for claim 1, wherein N=6.
7. the method for claim 1, this method more comprises:
(i) weighting of cancellation step (c);
(j) detect the signal strength signal intensity of these a plurality of neighbor base stations, and the signal strength signal intensity of the selected N of step (d) neighbor base station is increased the signal strength signal intensity of this weighted value as an above-mentioned N neighbor base station respectively; And
(k) after step (j), choose N the neighbor base station that wherein signal strength signal intensity is the strongest.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102045814A (en) * | 2009-10-26 | 2011-05-04 | 国基电子（上海）有限公司 | Wireless communication system and wireless communication method |
| CN112789805A (en) * | 2018-10-01 | 2021-05-11 | 微芯片技术股份有限公司 | Burst error tolerant decoder and related systems, methods and apparatus |
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2006
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102045814A (en) * | 2009-10-26 | 2011-05-04 | 国基电子（上海）有限公司 | Wireless communication system and wireless communication method |
| CN102045814B (en) * | 2009-10-26 | 2013-02-27 | 国基电子（上海）有限公司 | Wireless communication system and wireless communication method |
| CN112789805A (en) * | 2018-10-01 | 2021-05-11 | 微芯片技术股份有限公司 | Burst error tolerant decoder and related systems, methods and apparatus |
| US11831340B2 (en) | 2018-10-01 | 2023-11-28 | Microchip Technology Incorporated | Burst error tolerant decoder and related systems, methods, and devices |
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| CN100556193C (en) | 2009-10-28 |
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Granted publication date: 20091028 Termination date: 20100627 |