CN100444687C - Switchover object cell selection method in mobile communication system - Google Patents
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Abstract
The present invention provides a selection method for switching target cells in a mobile communication system based on a system frame number observation time difference change rate, which comprises the following steps: candidate cells which meets switching conditions are selected and are listed; system frame number observation time differences of the candidate cells are measured for user terminals and are reported periodically; the system frame number observation time difference change rate of an adjacent cell measured in a period of time is calculated in a network side; the moving trend of the user terminal is judged, and switching priorities of the candidate cells are set; a highest priority cell is selected as a switching target cell, and the user terminals are switched to the target cell. The present invention thoroughly considers users about the dynamic information of travel speeds, directions, etc. to select the adjacent cell which is most close to the user terminals as the switching target cell, which is favorable for lowering switching ratio and system dropping call rate and relieving system signaling load. The method of the present invention is suitable for a base station synchronization or a known base station timing difference mobile communication network.
Description
Technical field
The present invention relates to the handoff techniques in cellular mobile communication field, more precisely, relate to the ordering and the selection technology of Target cell in the handover procedure.
Background technology
In the existing mobile communications system method for handover control, incoming level, the signal quality of moving table measuring Serving cell signal, and the parameters such as signal level of adjacent cell, after network is received the measurement report of travelling carriage, call handoff algorithms, adopt certain decision rule to judge and to switch, select at least one adjacent cell as the candidate cell that switches according to measurement result then, in candidate cell, adopt certain criterion (using signal strength signal intensity usually) to select finally to be used to the Target cell that switches.Present existing selecting method of switching target community has a lot, and is main according to auxiliary switch decision of following criterions and select target sub-district:
1. select the strongest adjacent sub-district of pilot signal as Target cell; 2. select the better adjacent sub-district of signal quality as Target cell; 3. select pilot signal to arrive the adjacent sub-district of this travelling carriage path loss minimum as Target cell; According to the suitable adjacent sub-district of floored community Information Selection as Target cell.
Existing method mainly is to come the assisted Selection Target cell according to the current demand signal measured value, all is based on distance or the principle of received signal intensity in essence and comes the select target sub-district.The system of selection of these Target cells has only considered that the user measures state at that time, does not consider multidate informations such as the translational speed of terminal and direction; Even this has just caused having selected present adjacent sub-district nearest or that signal is the strongest to be switched, yet because the user's is mobile, cause switching the user probably and just just left this sub-district again, perhaps occurred a best cell in a short period of time again by the Target cell admittance; Just need to carry out new handoff procedure again in this case, therefore can cause frequent switching, thereby increase the system signaling load.The more important thing is that the long service quality that provides for the user that may make of switching controls process time descends, switching too frequently is easy to cause call drop, or even service disruption, and finally causes the decline of entire system performance.
As shown in Figure 1, sub-district A, B, C represent three adjacent sub-districts, and dotted line is represented this user's movement locus among the figure, and the arrow indication is the direction of motion.The user initially resides in sub-district A, and has set up two-way communication link, along with moving of user, when initiating handover, if d
B＜d
C, promptly closer apart from the base station of sub-district B, the B signal of base station intensity that then measures is better than sub-district C.According to existing object cell selection method, system entails selects sub-district B to switch as Target cell.Yet, along with moving of user, will enter sub-district C again very soon, so switch once more in a short period of time again.If user's high-speed mobile, possible this user does not also finish the complete procedure of switching to sub-district B, has just moved to sub-district C.Undoubtedly, the mode that this Target cell is selected is irrational, can increase intrasystem interference, also can't guarantee the user's communications quality.
Summary of the invention
The subject matter that the present invention will solve is to select suitable switching target small area according to the mobile message of user terminal in network, thereby raising success rate for switching, reduce the number of times that table tennis switches, reduce cutting off rate, finally guarantee the continuity and the stability of telex network.
According to the invention provides selecting method of switching target community in a kind of mobile communication system, comprise step:
The candidate cell and the tabulation of switching condition satisfied in selection;
Obtain the current service cell that user terminal periodically reports and the System Frame Number observed time difference of candidate cell, with the difference of the System Frame Number observed time difference of adjacent twice measurement in a period of time the time interval, draw the i candidate cell t rate of change Δ (t) of System Frame Number observed time difference constantly divided by this twice measurement
i
According to the rate of change of corresponding System Frame Number observed time difference the priority of each candidate cell is set, the rate of change of System Frame Number observed time difference is big more, and the priority of candidate cell is high more;
Select to switch the highest sub-district of priority as switching target small area.
The step that the candidate cell of switching condition is satisfied in described selection is that the thresholding that the thresholding according to the pilot signal strength of sub-district, adjacent cell signal strength surpass the error rate/Block Error Rate of the thresholding of this cell signal strength and channel quality is selected switching target small area, described three thresholdings use separately or are used in combination respectively, thereby obtain final candidate cell sorted lists.
Wherein in selecting the highest step of sub-district of priority, can be admitted at described Target cell, then carry out channel and reshuffle, and discharge the communication link of former sub-district at described Target cell if switch user terminal as switching target small area; If do not admitted, then select priority time high candidate cell to continue to attempt whether admitting; If all candidate cells all can not be admitted, the communication link that this handoff failure then, user terminal remain on former sub-district continues communication.
The embodiment of the invention also provides selecting method of switching target community in a kind of mobile communication system, comprising:
The candidate cell and the tabulation of switching condition satisfied in selection;
Obtain user terminal and report the System Frame Number observed time difference of current service cell and each candidate cell, calculate System Frame Number observed time difference poor of adjacent twice measurement with same period;
According to the difference of the System Frame Number observed time difference of adjacent twice measurement the priority of each candidate cell is set, the difference of the System Frame Number observed time difference of described adjacent twice measurement is big more, and the priority of candidate cell is high more;
Select to switch the highest sub-district of priority as switching target small area.
Compare with prior art, the present invention has taken into full account multidate information such as user's translational speed, direction and has selected the fastest close adjacent sub-district of user terminal as switching target small area, helps reducing switching rate and system's cutting off rate, the signaling traffic load of mitigation system.The inventive method is applicable to base station synchronization or the known mobile communications network of each base station timing difference.
Description of drawings
Fig. 1 is a handover scene schematic diagram.
Fig. 2 is the SFN of the different nodes B SFN-SFN observed time difference schematic diagram of user equipment (UE) when synchronous on the time.
Fig. 3 is the SFN of the different nodes B SFN-SFN observed time difference schematic diagram of user equipment (UE) when asynchronous on the time.
Fig. 4 is the flow chart that switching target small area is selected.
Embodiment
The present invention proposes to utilize SFN-SFN (System Frame Number-System Frame Number) observation time rate of change to determine the method for switching target small area, having under the situation of a plurality of Target cells, the rate of change of poor (the SFN_SFN OTD) of the System Frame Number by measuring observed this sub-district of UE (user terminal) and the System Frame Number of adjacent sub-district is judged mobile subscriber's motion track and mobile trend, the sub-district that the judgement user may enter is with adaptive user's mobility, can make the selection of Target cell reasonable more and accurate like this, thereby reduce switching rate, system's cutting off rate.
SFN represents the System Frame Number count value of sub-district, and this value is broadcasted at CBCH, span between 0 to 4095, the frame of each 10ms promptly two subframes have one SFN number.Employed SFN may be synchronous on the time between the sub-district, also may be asynchronous.For keep between the Node B synchronously and when switching between UE and the Node B synchronously, UE need measure SFN number of observed current service cell B (serving Node B) and SFN number of Target cell B (targetNode B) between temporal difference.
Fig. 1 is a handover scene schematic diagram.Three sub-district A, B shown in the figure and C, d
BAnd d
CRepresent the distance of portable terminal to sub-district B and C base station respectively, dotted arrow is represented the motion track of this portable terminal.
Fig. 2 is the SFN of the different nodes B SFN-SFN observed time difference schematic diagram of user equipment (UE) when synchronous on the time.Among the figure, d1 and d2 are respectively the distance of user terminal to Serving cell and Target cell.
As shown in Figure 2, if SFN number of Target cell and current service cell have synchronous SFN m on the time, m+1, m+2 ..., under connection mode, UE uses joint-detection (JD) algorithm at t=T
RxSFNiAnd t=T
RxSFNkThe time that receives and detect current service cell and Target cell is respectively gone up the SFN information of basic pilot channel (P-CCPCH) carrying of article one path arrival, the two temporal difference is the SFN-SFN observed time difference, with the chip time (chip) be unit.The reference point that SFN-SFN OTD measures is in UE antenna junction.Specifically can adopt formula (1) to calculate:
SFN-SFN OTD=T
RxTSk-T
RxTSi(chip) (1)
Wherein:
T
RxTSiBe the time of the P-CCPCH channel of i current service cell receiving of UE, go up the signal that article one path arrives with the detected time and be as the criterion.
T
RxTSkBe k Target cell receiving of UE the P-CCPCH channel near T
RxTSiTime, go up the signal that article one path arrives with the detected time and be as the criterion.
Fig. 3 is the SFN of the different nodes B SFN-SFN observed time difference schematic diagram of user equipment (UE) when asynchronous on the time.As shown in Figure 3, asynchronous if the SFN of SFN number of Target cell and current service cell had on the time, but its difference fixes, and then because RNC (radio network controller) can know its timing offset, can calculate SFN_SFN OTD equally.Computational methods are as follows: under connection mode, UE uses the JD algorithm at t=T
RxSFNiAnd t=T
RxSFNkThe time that receives and detect current service cell and Target cell is respectively gone up the SFN information of the P-CCPCH channel bearing of article one path arrival, the two temporal difference is the SFN-SFN observed time difference, and the reference point that SFN-SFN OTD measures is in UE antenna junction.Specifically can adopt formula (2) to calculate:
SFN-SFN OTD=OFF * 12800+T
m(chip) (2)
Wherein:
T
m=T
RxSFNi-T
RxSFNk, scope is 0,1 ..., 12799 chips
OFF=(SFN
i-SFN
k) mod 256, scope is 0,1 ..., between 255
T
RxTSiBe the time of the P-CCPCH channel of i current service cell receiving of UE, go up the signal that article one path arrives with the detected time and be as the criterion.
T
RxTSkBe k Target cell receiving of UE the P-CCPCH channel near T
RxTSiTime, go up the signal that article one path arrives with the detected time and be as the criterion.
SFN
iBe that UE is at moment T
RxSFNiReceive the also frame number of the system-frame of detected i Serving cell.
SFN
kBe that UE is at moment T
RxSFNkReceive the also frame number of the system-frame of detected k Target cell.
After the clear and definite notion of SFN_SFN OTD, same is example with the situation among Fig. 1, in the method for the invention, system reports according to the measurement of SFN_SFN OTD, the SFN_SFN OTD that adjacent twice measurement reported asks poor, time interval that reports divided by this twice measurement again, thus calculate the t rate of change Δ (t) of SFN_SFN OTD constantly at adjacent sub-district respectively
i:
T is the time interval that twice measurement reports in the formula.According to the result of aforementioned calculation judge the user near the speed of sub-district C than faster near the speed of sub-district B, if sub-district B, C satisfy the primary condition of switching as the candidate cell with layer, so, system will select sub-district C as Target cell, thereby can reduce the unnecessary frequent switching that causes of moving owing to the user.
The present invention utilizes the rate of change of SFN_SFN observed time difference to determine user terminal travel direction (trend), thereby judges that the user will be faster near which adjacent sub-district.Because SFN_SFN observed time difference rate of change can just can be born, according to definition, the present invention is only to consider that SFN_SFN observed time difference rate of change is positive situation to the processing criterion of SFN_SFN observed time difference, when promptly if rate of change is negative, the user is described just away from this sub-district, then it should be deleted from the Target cell that switches.
The detailed implementation process of selecting method of switching target community of the present invention is described in conjunction with example referring to Fig. 4.
When the mobile subscriber moves to cell edge, when perhaps causing communication quality to worsen, start measurement to adjacent cell signal owing to signal strength signal intensity is not enough, enter the handover flow process.
When selecting switching target small area, at first will satisfy the adjacent sub-district of switching primary condition and include candidate set in, the pilot signal strength that the primary condition of switching refers to this sub-district continues to be lower than predetermined threshold value in a period of time, be defined as thresholding 1, perhaps adjacent cell signal strength surpasses a given thresholding of this cell signal strength, be defined as thresholding 2, perhaps the error rate/the Block Error Rate of channel quality (BER/BLER) deteriorates into below the threshold value, is defined as thresholding 3.The thresholding 1,2 and 3 of the primary condition of above-mentioned selection switching target small area can use separately, also can be used in combination respectively, thereby obtain final candidate cell prioritization tabulation.Excessive or when surpassing given threshold value, judgement is carried out floored community and switched at System Frame Number observed time difference rate of change.
Then, by the SFN_SFN observed time difference of user terminal continuous measurement to each candidate cell, and periodic report is to network side, makes that t is SFN_SFN (t) to the measurement reported result of adjacent cell i constantly
i
Then, network controller (RNC) calculates the rate of change Δ (t) of UE at the SFN_SFN observed time difference of each adjacent sub-district in a period of time according to each measurement result to adjacent sub-district respectively
i:
If UE adopts identical measurement report cycle to each adjacent sub-district, then can directly utilize the difference of the adjacent SFN_SFN OTD that reports for twice to replace rate of change to adjudicate:
Δ
i＝SFN-SFN?OTD(t)
i-SFN-SFN?OTD(t-T)
i (4)
SFN-SFN OTD (t) in the formula
iWith SFN-SFN OTD (t-T)
iBe respectively the i sub-district at moment t and System Frame Number observed time difference (t-T), T is the time interval that reports of twice measurement.
Then, RNC presses Δ
iMagnitude relationship the switching priority of candidate cell is set, System Frame Number observed time difference rate of change is big more, and fast more this close sub-district of user is described, it is high more to switch the priority setting; At last, according to candidate cell of priority selective sequential from high in the end as Target cell.Can be admitted at this Target cell if switch the user, then carry out channel and reshuffle, and discharge the communication link of former sub-district at this Target cell; If do not admitted, then select priority time high candidate cell to continue to attempt whether admitting; If all candidate cells all can not be admitted, this handoff failure then, the communication link that the user will remain on former sub-district continues communication.
Claims (10)
1. selecting method of switching target community in the mobile communication system comprises step:
The candidate cell and the tabulation of switching condition satisfied in selection;
Obtain the current service cell that user terminal periodically reports and the System Frame Number observed time difference of candidate cell, with the difference of the System Frame Number observed time difference of adjacent twice measurement in a period of time the time interval, draw the i candidate cell t rate of change Δ (t) of System Frame Number observed time difference constantly divided by this twice measurement
i
According to the rate of change of corresponding System Frame Number observed time difference the priority of each candidate cell is set, the rate of change of System Frame Number observed time difference is big more, and the priority of candidate cell is high more;
Select to switch the highest sub-district of priority as switching target small area.
2. according to the selecting method of switching target community of claim 1, also comprise: if the rate of change of the i sub-district that calculates when negative, is then deleted the i sub-district from the Target cell that switches.
3. according to the selecting method of switching target community of claim 1, the step that the candidate cell of switching condition is satisfied in described selection is that the thresholding that the thresholding according to the pilot signal strength of sub-district, adjacent cell signal strength surpass the error rate/Block Error Rate of the thresholding of this cell signal strength and channel quality is selected switching target small area, described three thresholdings use separately or are used in combination respectively, thereby obtain final candidate cell sorted lists.
4. according to the selecting method of switching target community of claim 3, wherein said user terminal switches to the step of this Target cell when System Frame Number observed time difference rate of change surpasses given threshold value, and judgement is carried out floored community and switched.
5. according to the selecting method of switching target community of claim 1, wherein in selecting the highest step of sub-district of priority as switching target small area, if switching user terminal can be admitted at described Target cell, then carry out channel and reshuffle, and discharge the communication link of former sub-district at described Target cell; If do not admitted, then select priority time high candidate cell to continue to attempt whether admitting; If all candidate cells all can not be admitted, the communication link that this handoff failure then, user terminal remain on former sub-district continues communication.
6. selecting method of switching target community in the mobile communication system is characterized in that, comprising:
The candidate cell and the tabulation of switching condition satisfied in selection;
Obtain user terminal and report the System Frame Number observed time difference of current service cell and each candidate cell, calculate System Frame Number observed time difference poor of adjacent twice measurement with same period;
According to the difference of the System Frame Number observed time difference of adjacent twice measurement the priority of each candidate cell is set, the difference of the System Frame Number observed time difference of described adjacent twice measurement is big more, and the priority of candidate cell is high more;
Select to switch the highest sub-district of priority as switching target small area.
7. according to the selecting method of switching target community of claim 6, also comprise: if the difference of the System Frame Number observed time difference of adjacent twice measurement of the i sub-district that calculates when negative, is deleted the i sub-district from the Target cell that switches.
8. according to the selecting method of switching target community of claim 6, the step that the candidate cell of switching condition is satisfied in described selection is that the thresholding that the thresholding according to the pilot signal strength of sub-district, adjacent cell signal strength surpass the error rate/Block Error Rate of the thresholding of this cell signal strength and channel quality is selected switching target small area, described three thresholdings use separately or are used in combination respectively, thereby obtain final candidate cell sorted lists.
9. selecting method of switching target community according to Claim 8, wherein said user terminal switch to the step of this Target cell when the difference of the System Frame Number observed time difference of adjacent twice measurement surpasses given threshold value, and judgement is carried out floored community and switched.
10. according to the selecting method of switching target community of claim 6, wherein in selecting the highest step of sub-district of priority as switching target small area, if switching user terminal can be admitted at described Target cell, then carry out channel and reshuffle, and discharge the communication link of former sub-district at described Target cell; If do not admitted, then select priority time high candidate cell to continue to attempt whether admitting; If all candidate cells all can not be admitted, the communication link that this handoff failure then, user terminal remain on former sub-district continues communication.
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| CN101442786A (en) * | 2008-12-31 | 2009-05-27 | 华为技术有限公司 | Method and apparatus for determining target district |
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| CN101848520B (en) * | 2009-03-24 | 2012-09-26 | 上海摩波彼克半导体有限公司 | Method for realizing cell reselection of mobile equipment in mobile communication system |
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| EP2309795A1 (en) * | 2009-10-12 | 2011-04-13 | Alcatel Lucent | Method and apparatus for handover management in a wireless communications network |
| CN102065495A (en) * | 2009-11-13 | 2011-05-18 | 大唐移动通信设备有限公司 | Method, system and base station for selecting target cell |
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| CN102545997B (en) * | 2010-12-31 | 2014-12-10 | 中国移动通信集团公司 | Method for determining system frame number, communication system and device |
| CN102547897A (en) * | 2012-01-16 | 2012-07-04 | 中国联合网络通信集团有限公司 | Cell switching method and access network equipment |
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| CN104145501B (en) * | 2012-11-29 | 2018-06-15 | 华为技术有限公司 | The processing method and equipment of a kind of timing reference cell |
| CN103945466B (en) * | 2014-04-02 | 2018-09-28 | 京信通信系统（中国）有限公司 | A kind of method and apparatus of determining handover candidate cells set |
| CN106664632A (en) * | 2015-04-29 | 2017-05-10 | 华为技术有限公司 | Method and apparatus for determining target cell |
| CN112187380B (en) * | 2019-07-01 | 2023-04-07 | 中国移动通信集团浙江有限公司 | Serving cell switching method and device |
| CN114514779B (en) * | 2019-10-18 | 2025-01-07 | 株式会社Ntt都科摩 | terminal |
| CN115002845B (en) * | 2021-03-01 | 2023-08-22 | 中国联合网络通信集团有限公司 | Method and device for cell switching |
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