CN1802006A - Interlaminar switching method in WCDMA hierarchical network - Google Patents
Interlaminar switching method in WCDMA hierarchical network Download PDFInfo
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Abstract
Present invention provides interlayer switch method for WCDMA layering network. It contains measuring traveling platform speed, when traveling platform speed is quickly and existing higher cell, then adopting Intermission measurement mode switching to higher cell, when traveling platform speed is normal, then staying in said layer, when traveling platform speed is slow, and existing lower cell, then adopting Intermission measurement mode switching to lower cell. Said invention reduces influence of start compression mode to system performance, and avoiding ping-pong switching.
Description
Technical field
The present invention relates to the network communications technology, relate in particular to the interlaminar switching method in a kind of WCDMA Hierarchical Network.
Background technology
In WCDMA (Wideband Code Division Multiple Access (WCDMA)) mobile communication system, in order to satisfy the demand of a plurality of high-speed data services, need enough big system business capacity, generally by reducing the power system capacity on the coverage radius of cell raising unit are.At hot zones, absorb telephone traffic by increasing Microcell; At the extra high dense city of telephone traffic, realized covering continuously in flakes of Microcell.But for the travelling carriage of high-speed motion, Microcell will bring a lot of problems, raise as cutting off rate, and the system signaling load increases, and power system capacity reduces.
In order to address the above problem, introduced the network configuration of floored community, on microcell level, increase the continuous cover layer of one deck macrocell again.The covering radius of macrocell wants big than the covering radius of Microcell, and the travelling carriage of two layers has different movement velocitys, the motion velocity of mobile station that the covering radius of macrocell is corresponding higher, the lower motion velocity of mobile station of covering radius correspondence of Microcell.If notion is promoted, just can obtain the floored community of multilayer.
In order to control the mobile station in selecting network layer, network need be estimated the travelling carriage translational speed.Usually, described travelling carriage translational speed is not meant the actual physics movement velocity of travelling carriage in the network, and is meant the number of times that the minizone switching takes place in the network.Thereby reflect frequent switching degree by the travelling carriage translational speed, so that take corresponding strategy to avoid because of the frequent variety of issue that causes that switches.The general travelling carriage that adopts switches the foundation of historical record as moving speed estimation for mobile station.
Carrying out interlayer according to the velocity estimation result switches.Usually the speed result is divided into three kinds of situations: fast, at a slow speed and normal speed.Travelling carriage need switch in the higher sub-district of level (as macrocell) fast, and travelling carriage at a slow speed need switch in the lower sub-district of level (as Microcell), and the travelling carriage of normal speed is trapped in this layer.Contact by between the interlayer handoff procedure maintenance different levels realizes the transfer of travelling carriage each level in network.When networking, different layers generally have different frequencies, and interlayer switches by alien frequencies and switches realization, generally need start compact model when handover measurement.
Emulation shows, if be in the travelling carriage large percentage of compressed mode status in a sub-district, will produce considerable influence to covering, quality and the capacity of system, therefore should start compact model less as far as possible.
Yet in the prior art, measurement and arbitration schemes that interlayer switches are taked continuous different-frequency measure.When the comprehensive quality of active set is lower than certain thresholding, trigger the alien frequencies handover measurement, and this measurement is carried out always.In measuring process,, then be directly switch to this sub-district if, find suitable alien-frequency district through measuring; If the comprehensive quality of active set is higher than certain thresholding, then stop the alien frequencies handover measurement.
Owing to adopt continuous different-frequency measure to switch, at this moment for some situation, cover continuously as macrocell, but the area of the discontinuous covering of Microcell, this moment, travelling carriage will be measured the fall short sub-district when macrocell is initiated to the handover measurement of Microcell, if different-frequency measure starts always, not only can not search the signal of Target cell, but also the transmitting power that can consume mobile station terminal if also start compact model simultaneously, will have a strong impact on systematic function.
In addition, in some cases, travelling carriage is estimated as at a slow speed when macrocell, if but switch to Microcell and may can be estimated as again fast, interlayer table tennis appears.Thereby increased the switching frequency of interlayer, reduced communication efficiency.
Summary of the invention
The objective of the invention is shortcoming at above-mentioned prior art, interlaminar switching method in a kind of WCDMA Hierarchical Network is provided, thereby the travelling carriage ratio that is in compressed mode status when having solved because of realization interlayer switching in hierarchical network architecture is excessive, and cause the problem that reduces systematic function, and travelling carriage may switch back to " table tennis " switching problem of macrocell when switching to Microcell by macrocell again very soon.
The invention provides the interlaminar switching method in a kind of WCDMA Hierarchical Network, comprising:
The translational speed of A, measurement travelling carriage;
B, according to the translational speed of described travelling carriage, adopt intermittently metering system to carry out interlayer and switch.
Described step B further comprises: when the translational speed of travelling carriage for fast, and when having the higher sub-district of level, then adopting intermittently, metering system switches to the higher sub-district of level.
Described employing intermittently metering system further comprises to the higher sub-district switching of level:
B12, select the frequency and the abutting subdistrict thereof of the higher sub-district of level, start measurement, judgement and compact model; And starting measurement timer and cycle timer, the duration of described measurement timer is less than the duration of cycle timer;
B13, judged whether that the Target cell signal satisfy to switch requirement, if having
B14, it is chosen as Target cell; And the execution switching flow, switch to Target cell, stop this process,
Otherwise,
B15, overtime when measurement timer stops measurement, judgement and compact model;
B16, overtime when cycle timer forwards step B12 to.
Described step B also is provided with the measurement number of times, and described measurement number of times is represented the number of times that measurement timer starts, and when the measurement number of times equals fast moving platform interlayer switching retry maximum times, then stops this process.
Described step B further comprises: when the translational speed of travelling carriage is normal speed, then be trapped in this layer.
Described step B further comprises: when the translational speed of travelling carriage at a slow speed the time, and when having the lower sub-district of level, then adopting intermittently, metering system switches to the lower sub-district of level.
Described step B further comprises: when the translational speed of travelling carriage at a slow speed the time, and when having the lower sub-district of level, then adopt intermittently metering system sub-district lower to level, selected pre-determined number to switch.
Described step B further comprises:
B21, the lower abutting subdistrict of selection level, to each abutting subdistrict of destination layer, it is chosen continuously and is Target cell number of times clear 0;
The frequency and the abutting subdistrict of B22, the low sub-district of selection level start measurement, judgement and compact model, and measurement timer and cycle timer, and the duration of described measurement timer is less than the duration of cycle timer;
B23, during measuring, to all abutting subdistricts, when the abutting subdistrict signal quality satisfy to switch when requiring, then choose continuously to the Target cell number of times to add 1;
B24, overtime when measurement timer stops measurement, judgement and compact model;
Whether B25, judgement have the abutting subdistrict of choosing the speed pre-estimation parameter that equals to switch between client layer at a slow speed for the Target cell number of times continuously in abutting subdistrict, if having,
B26, it is chosen as Target cell; And the execution switching flow, switch to Target cell, stop this process;
Otherwise,
B27, when cycle timer is overtime, forward step 22 to.
Described step B also is provided with the measurement number of times, and described measurement number of times is represented the number of times that measurement timer starts, and the travelling carriage interlayer switches the retry maximum times and before execution in step B27, also carries out when the measurement number of times equals at a slow speed:
B28, select all of its neighbor sub-district choose continuously into sub-district maximum in the Target cell number of times as Target cell, and carry out switching flow, switch to Target cell, stop this process.
During measuring, do not satisfy the abutting subdistrict that switches requirement for signal quality always, choose continuously to be Target cell number of times clear 0.
Described step B28 further comprises:
B31, judge the choosing continuously of all of its neighbor sub-district to whether the Target cell number of times is 0, if,
B32, then stop this process,
Otherwise,
It is Target cell that the sub-district for Target cell number of times maximum is chosen in B33, selection continuously, and it is chosen as Target cell, and carries out switching flow, switches to Target cell, stops this process.
Describedly it is chosen as Target cell further comprises: switch requirement if there are a plurality of Target cell signals to satisfy, then selecting a best sub-district of signal quality is Target cell.
According to the present invention, when the interlayer handover measurement, the present invention has adopted step metering system, thereby has reduced to start the influence of compact model to systematic function.In addition, when macrocell switched to Microcell, the present invention had adopted when Target cell and has been measured when selected by continuous several times, and travelling carriage just switches to this Target cell, that is to say travelling carriage is estimated in the speed of Target cell, thereby avoided table tennis to switch.
Description of drawings
Fig. 1 is the flow chart that switches to macrocell of the present invention;
Fig. 2 is the flow chart that switches to Microcell of the present invention.
Embodiment
Understand and realization the present invention the existing embodiments of the invention of describing in conjunction with the accompanying drawings for the ease of persons skilled in the art.
Interlayer handover measurement in the WCDMA Hierarchical Network of the present invention adopts metering system intermittently.That is to say that travelling carriage, can stop earlier measuring if do not find suitable destination layer sub-district after measuring after a while, changed through wireless environment after a while and initiated again again to measure, continue to seek suitable destination layer sub-district.
According to the present invention, so-called interlayer switching is meant: because each layer all can carry out the estimation of speed state to travelling carriage in network, when the current estimating speed of finding travelling carriage and level of living in were inconsistent, promptly the velocity estimation state of travelling carriage was the switching that just need carry out fast or at a slow speed the time between level.If travelling carriage is fast and has the higher alien frequencies abutting subdistrict of level, then attempts to switch on these sub-districts; If travelling carriage is at a slow speed and has the lower alien frequencies abutting subdistrict of level, then attempts to switch on these sub-districts.
When travelling carriage switched to a new level, the speed state of travelling carriage was defaulted as normal speed.In the duration after this, network can be assessed the speed of travelling carriage, and according to the assessment result of speed it is switched.
Below interlayer handoff procedure of the present invention is elaborated.
For convenience of explanation, at first define following constant:
TmeasFast fast moving platform interlayer handover measurement time span
TretryFast fast moving platform interlayer switches the retry time interval, and TretryFast must be greater than TmeasFast
NretryFast fast moving platform interlayer switches the retry maximum times
TmeasSlow is travelling carriage interlayer handover measurement time span at a slow speed
TretrySlow travelling carriage interlayer at a slow speed switches the retry time interval, and TretrySlow must be greater than TmeasSlow
NretrySlow travelling carriage interlayer at a slow speed switches the retry maximum times
NhystSlow is the speed pre-estimation parameter of travelling carriage interlayer switching at a slow speed
The present invention for convenience of explanation also will define following variable and timer:
The measurement number of times that MeasNum has started
The TmeasTimer measurement timer
The TretryTimer cycle timer
NhystCnt (i) abutting subdistrict i is elected as the number of times of Target cell continuously
The method of switching to macrocell from the lower Microcell of level at first is described.
Now to be in Microcell be example velocity estimation state that travelling carriage is described by other state transitions when quick with travelling carriage, the process of being switched to the higher sub-district of level (macrocell layer) by the lower sub-district of level (Microcell).
As shown in Figure 1, in step 1, MeasNum clear 0.
In step 2, select frequency and abutting subdistrict according to the hierarchy of objectivies, start and measure, adjudicate.If need to start compact model through judging, start compact model simultaneously.Starting duration is the timer TmeasTimer of TmeasFast, and starting duration is the timer TretryTimer of TretryFast.
In step 3, because interlayer switches the signal that does not need the interlayer sub-district quality contrast is arranged, as long as the pilot signal quality of Target cell (macrocell) can cover current mobile station;
Judged whether that a plurality of Target cell signals satisfy the switching requirement, if
Then in step 8, select the top-quality Target cell of current demand signal; If selected suitable Target cell through switch decision, then start to switch and carry out flow process, switch to Target cell, stop this process, return;
Otherwise, execution in step 4.
In step 4, if timer TmeasTimer is overtime, stop measurement, judgement and compact model, MeasNum adds 1.
In step 5, judge whether MeasNum equals the maximum times N retryFast that measures, if then execution in step 9, stop this process, returns, and explanation does not at this moment have higher level Target cell, can not switch.
In step 6, after the another period (TretryFast-TmeasFast), that is, timer TretryTimer is overtime, forwards step 2 to.
When travelling carriage from the lower sub-district of level when switch the higher sub-district of level, the present invention has adopted step metering system, thereby has reduced to start the influence of compact model to systematic function.
Secondly, will describe the method for switching to the lower Microcell of level from the higher macrocell of level below in detail.
Now to be in macrocell be example velocity estimation state that travelling carriage is described by other state transitions at a slow speed the time with travelling carriage, goes up the process of switching to the lower sub-district of level (microcell level) by the higher sub-district of level (macrocell).
As shown in Figure 2, in step 21, will measure number of times MeasNum clear 0.Select abutting subdistrict according to hierarchy of objectivies priority, to all destination layer abutting subdistrict i, NhystCnt (i) clear 0.
In step 22, select frequency and abutting subdistrict according to the destination layer priority, start and measure and judgement; If need to start compact model through judging, start compact model simultaneously.Starting duration is the timer TmeasTimer of TmeasSlow, and starting duration is the timer TretryTimer of TretrySlow.
In step 23, because interlayer switches the signal that does not need the interlayer sub-district quality contrast is arranged, as long as the pilot signal quality of Target cell can cover current mobile station.In the measurement duration of TmeasSlow, if satisfying, abutting subdistrict i signal quality switches requirement, then NhystCnt (i) adds 1.
In step 24,, stop measurement, judgement and compact model if timer TmeasTimer is overtime.
In step 25, judge in abutting subdistrict i whether have NhystCnt (i) to equal the abutting subdistrict of NhystSlow, if,
In step 27, then selecting this sub-district is Target cell; If there are a plurality of such sub-districts, then select top-quality one of current demand signal; And start switching execution flow process, and switch to Target cell, stop this process, and return;
Otherwise, in step 26, measure number of times MeasNum and add 1, and judge whether measure number of times MeasNum equals NretrySlow, if,
In step 28, judge whether the NhystCnt (i) of all of its neighbor sub-district is 0, if,
In step 29, then stop this process, and return, explanation does not at this moment have the more sub-district of low level, can not switch;
Otherwise in step 30, selecting the maximum sub-district of NhystCnt (i) is Target cell; If there are a plurality of such sub-districts, then select best one of signal quality wherein.If Target cell is chosen, then start to switch and carry out flow process, switch to Target cell, return.
Otherwise, in step 31, in the measurement duration of TmeasSlow, do not satisfy the abutting subdistrict i that switches requirement, NhystCnt (i) clear 0 for signal quality always.
In step 32, timer TretryTimer is overtime, forwards step 2 to.
When travelling carriage from macrocell when Microcell switches because adopt batch (-type) to measure, can reduce the influence of compact model to system.When macrocell switches to Microcell, when selecting, choose continuously and just switch for NhystSlow time for Target cell, played the effect that speed is estimated, can avoid the switching problem of rattling.
Though described the present invention by embodiment, those of ordinary skills know, without departing from the spirit and substance in the present invention, just can make the present invention that many distortion and variation are arranged, and scope of the present invention is limited to the appended claims.
Claims (12)
1. the interlaminar switching method in the WCDMA Hierarchical Network is characterized in that, comprising:
The translational speed of A, measurement travelling carriage;
B, according to the translational speed of described travelling carriage, adopt intermittently metering system to carry out interlayer and switch.
2. the interlaminar switching method in the WCDMA Hierarchical Network according to claim 1, it is characterized in that, described step B further comprises: when the translational speed of travelling carriage for fast, and when having the higher sub-district of level, then adopting intermittently, metering system switches to the higher sub-district of level.
3. the interlaminar switching method in the WCDMA Hierarchical Network according to claim 2 is characterized in that, described employing intermittently metering system further comprises to the higher sub-district switching of level:
B12, select the frequency and the abutting subdistrict thereof of the higher sub-district of level, start measurement, judgement and compact model; And starting measurement timer and cycle timer, the duration of described measurement timer is less than the duration of cycle timer;
B13, judged whether that the Target cell signal satisfy to switch requirement, if having
B14, it is chosen as Target cell; And the execution switching flow, switch to Target cell, stop
This process of ending,
Otherwise,
B15, overtime when measurement timer stops measurement, judgement and compact model;
B16, overtime when cycle timer forwards step B12 to.
4. the interlaminar switching method in the WCDMA Hierarchical Network according to claim 3, it is characterized in that, described step B also is provided with the measurement number of times, described measurement number of times is represented the number of times that measurement timer starts, when the measurement number of times equals fast moving platform interlayer switching retry maximum times, then stop this process.
5. the interlaminar switching method in the WCDMA Hierarchical Network according to claim 1 is characterized in that, described step B further comprises: when the translational speed of travelling carriage is normal speed, then be trapped in this layer.
6. the interlaminar switching method in the WCDMA Hierarchical Network according to claim 1, it is characterized in that, described step B further comprises: when the translational speed of travelling carriage at a slow speed the time, and when having the lower sub-district of level, then adopting intermittently, metering system switches to the lower sub-district of level.
7. the interlaminar switching method in the WCDMA Hierarchical Network according to claim 6, it is characterized in that, described step B further comprises: when the translational speed of travelling carriage at a slow speed the time, and when having the lower sub-district of level, then adopt intermittently metering system sub-district lower to level, selected pre-determined number to switch.
8. the interlaminar switching method in the WCDMA Hierarchical Network according to claim 7 is characterized in that, described step B further comprises:
B21, the lower abutting subdistrict of selection level, to each abutting subdistrict of destination layer, it is chosen continuously and is Target cell number of times clear 0;
The frequency and the abutting subdistrict of B22, the low sub-district of selection level start measurement, judgement and compact model, and measurement timer and cycle timer, and the duration of described measurement timer is less than the duration of cycle timer;
B23, during measuring, to all abutting subdistricts, when the abutting subdistrict signal quality satisfy to switch when requiring, then choose continuously to the Target cell number of times to add 1;
B24, overtime when measurement timer stops measurement, judgement and compact model;
Whether B25, judgement have the abutting subdistrict of choosing the speed pre-estimation parameter that equals to switch between client layer at a slow speed for the Target cell number of times continuously in abutting subdistrict, if having,
B26, it is chosen as Target cell; And the execution switching flow, switch to Target cell, stop
This process of ending;
Otherwise,
B27, when cycle timer is overtime, forward step 22 to.
9. the interlaminar switching method in the WCDMA Hierarchical Network according to claim 8, it is characterized in that, described step B also is provided with the measurement number of times, described measurement number of times is represented the number of times that measurement timer starts, the travelling carriage interlayer switches the retry maximum times and before execution in step B27, also carries out when the measurement number of times equals at a slow speed:
B28, select all of its neighbor sub-district choose continuously into sub-district maximum in the Target cell number of times as Target cell, and carry out switching flow, switch to Target cell, stop this process.
10. according to Claim 8 or the interlaminar switching method in the 9 described WCDMA Hierarchical Networks, it is characterized in that, during measuring, do not satisfy for signal quality always and to switch the abutting subdistrict that requires, choose continuously to be Target cell number of times clear 0.
11. the interlaminar switching method in the WCDMA Hierarchical Network according to claim 9 is characterized in that, described step B28 further comprises:
B31, judge the choosing continuously of all of its neighbor sub-district to whether the Target cell number of times is 0, if,
B32, then stop this process,
Otherwise,
It is Target cell that the sub-district for Target cell number of times maximum is chosen in B33, selection continuously, and it is chosen as Target cell, and carries out switching flow, switches to Target cell, stops this process.
12. according to the interlaminar switching method in claim 5 or the 8 described WCDMA Hierarchical Networks, it is characterized in that, describedly it is chosen as Target cell further comprises: switch requirement if there are a plurality of Target cell signals to satisfy, then selecting a best sub-district of signal quality is Target cell.
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| WO2008089640A1 (en) * | 2007-01-17 | 2008-07-31 | Huawei Technologies Co., Ltd. | Method for handovering a terminal to a macrocell, system, terminal, ap and gateway thereof |
| WO2009152747A1 (en) * | 2008-06-16 | 2009-12-23 | 华为技术有限公司 | Method, system and device for triggering switching |
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| WO2015165041A1 (en) * | 2014-04-29 | 2015-11-05 | 华为技术有限公司 | Handover method and device |
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| CN104205939A (en) * | 2012-05-16 | 2014-12-10 | 富士通株式会社 | Heterogeneous network mobility enhancing method, device and system |
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