CN100486352C - Switching method in wireless mobile communication system and system - Google Patents
Switching method in wireless mobile communication system and system Download PDFInfo
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- CN100486352C CN100486352C CNB2005100815376A CN200510081537A CN100486352C CN 100486352 C CN100486352 C CN 100486352C CN B2005100815376 A CNB2005100815376 A CN B2005100815376A CN 200510081537 A CN200510081537 A CN 200510081537A CN 100486352 C CN100486352 C CN 100486352C
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Abstract
A method for carrying out switching in radio mobile communication system includes obtaining signal transmission parameter value of mobile terminal and dynamically regulating decision threshold of switch when it is confirmed that said signal transmission parameter value is satisfied to preset condition, carrying out switch decision and switch course of mobile terminal according to regulated decision threshold of switch.
Description
Technical field
The present invention relates to the network communications technology field, be specifically related to changing method and system in a kind of mobile radio system.
Background technology
Mobile radio system generally comprises BS (base station) and two elements of MS (portable terminal).Intercommunication mutually between BS and MS does not realize by wired passage, realizes communication but transmit and receive electromagnetic wave with wireless mode by radio receiving-transmitting unit.Each radio receiving-transmitting unit all has certain coverage, if exceeded this coverage, and communicating by letter and will interrupt between BS and MS.
A BS can communicate with a plurality of MS in its coverage, and the signal that BS sends to MS is called downstream signal, and the signal that MS sends to BS is called upward signal.The limited coverage area of each BS, still a plurality of BS link together with certain rule and just can constitute covering wireless communication networks in a big way.
In wireless communication networks, because MS is movably, and BS is fixed, so when MS moved through the overlay area of different B S, MS can constantly change the BS that communicates with, to guarantee communication continuity, this process is called switching.
When MS or BS detect signal and satisfy certain switching condition, can initiate to switch.It is multi-form that switching can be divided into direct-cut operation and soft handover etc. again.Direct-cut operation is: when suitable Target cell is arranged in detecting neighbor cell, disconnect and being connected of original sub-district, foundation and Target cell is connected then.Direct-cut operation all is suitable for switch instances such as between co-frequency cell, alien-frequency district, system.Since direct-cut operation with being connected of first disconnection before Target cell is connected and former sub-district, so direct-cut operation might cause call drop.Soft switching process foundation simultaneously is connected with a plurality of sub-districts.Soft handover can not cause call drop, is that cost is enjoyed diversity gain to take more resources.
Direct-cut operation is realized simply widely using in each communication system because it is applied widely.How to reduce the cutting off rate in the handoff procedure, accelerate hard handoff procedure and become one of key technology of direct-cut operation.
Switch decision algorithm and object cell selection method in the direct-cut operation are different, and performance of handoffs also has nothing in common with each other.In the switch decision algorithm, different judgement foundations can be set, the judgement foundation is the uplink and downlink signal transfer quality mainly.The measurement parameter of signal transmission quality can be a signal to noise ratio, error rate or the like.In addition, also can adjudicate foundation with the conducts such as propagation delay of loss on the wireless path and region, edge.
The implementation procedure of direct-cut operation mainly comprises following 3 steps:
Step 1, measure and report process.MS carries out the measurement of each sub-district earlier before switching, and measurement result can adopt Event triggered to report or mode such as periodically report to report.The content of measuring is the amount that switch decision need be used, and mainly is signal transmission quality, such as the signal to noise ratio of signal, error rate or the like.
Step 2, switch decision process.Promptly comprehensively judge whether switch and the process how to switch according to measurement result and network condition.Reasonably judgement and suitable switching time are the keys of successful switch.Present decision algorithm is to follow certain thresholding to compare the signal transmission quality of the signal transmission quality of former sub-district and Target cell, and meeting some requirements just can switch to Target cell by former sub-district.Thresholding can be limit for absolute door, also can be relative threshold, is issued by the cell system broadcast.
Decision algorithm to absolute door limit, relative threshold describes below.
Decision algorithm one: relative threshold is set, a hysteresis (sluggishness) promptly is set.With SNR (signal to noise ratio) is that judgement amount is that example describes this decision algorithm.
Setting Serving BS SNR is the Signal-to-Noise of former Serving cell, target BS SNR is the Signal-to-Noise of Target cell, then have: when Serving BS SNR+hysteresis＜targetBS SNR, determine and to switch, when switching, must select those sub-districts of satisfying this requirement as candidate target cells, that is to say that the signal transmission quality of Target cell should exceed hysteresis by minimum signal transmission quality than former Serving cell.
Decision algorithm two is provided with absolute thresholding, and thresholding H_DROP that disconnects former sub-district and the thresholding H_ADD that switches to Target cell promptly are set.With SNR is that judgement amount is that example describes this decision algorithm.
Setting Serving BS SNR is the Signal-to-Noise of former Serving cell, target BS SNR is the Signal-to-Noise of Target cell, then have: as Serving BS SNR＜H_DROP and target BS SNR during H_ADD, determine and to switch, when switching, must select those sub-districts of satisfying above-mentioned requirements as candidate target cells, that is to say that the signal transmission quality of Target cell should the minimum H_ADD that is higher than.
Step 3, execution handoff procedure.Terminal is cut off the link of itself and former sub-district, and sets up synchronously with Target cell, sets up new Radio Link and connects.
Be that to be example with SNR be described the implementation procedure of direct-cut operation above, if with parameters such as the error rate or the path delays of time as judgement amount, its implementation procedure is similar substantially, it is parameter variation tendency, promptly rise and decline and foregoing description process on the contrary, its former because: portable terminal moves at cell edge, brings the error rate to rise or rise the path delay of time, and is just in time corresponding with the decline of SNR.
In the implementation procedure of direct-cut operation, the switch decision process is the key that guarantees handover success.
At present, no matter switch decision is that relative threshold or absolute thresholding are set, no matter be with signal transmission quality or to make decision parameter path delay of time etc., no matter relatively, how absolute thresholding makes up, thresholding all fixedly installs, when arriving fixed threshold, the decision parameter of former sub-district initiates to switch, and can be when the decision parameter of adjacent sub-district reaches fixed threshold as Target cell.
But in actual environment, because cell boarder disturbs greatly, the signal transmission quality of link descends very fast, and signal worsens probably fast in switching time, does not finish as yet if switch, and former cell signal transmission quality is very poor, then the call drop phenomenon can take place.In addition, because handoff threshold is fixed, the movement velocity difference of MS, the residing link condition of MS are also changing, and, handoff procedure needs certain time delay again, like this, though measurement parameter meets thresholding when switch decision, when switching is finished, the parameter of realistic objective sub-district may might not meet the thresholding that originally the Target cell parameter is provided with, and makes to switch to have lost meaning.
At present, for preventing the generation of call drop phenomenon, improve the direct-cut operation success rate, also take to strengthen the overlapping region, improve the method for handoff threshold, still, do the interference that has increased the minizone like this, and, also can increase interference, cause unnecessary switching the unified thresholding that improves of the MS of different link condition.
Summary of the invention
The objective of the invention is to, changing method and system in a kind of mobile radio system are provided,,, improve the purpose of resource utilization ratio to realize improving handover success rate by dynamic adjustment switch decision thresholding.
For achieving the above object, the changing method in a kind of mobile radio system provided by the invention comprises:
A, obtain the signal transmission parameters value of portable terminal;
B, when definite described signal transmission parameters value satisfies predetermined condition, dynamically adjust the switch decision thresholding; Described switch decision thresholding comprises: portable terminal disconnects the absolute thresholding that the absolute thresholding that links with former sub-district and portable terminal switch to the adjacent target sub-district;
C, carry out the switch decision and the handoff procedure of portable terminal according to described adjusted switch decision thresholding.
Described switch decision thresholding comprises: switch relative threshold.
Described signal transmission parameters is: signal transmission quality and/or received signal intensity and/or loss and/or propagation delay.
When the signal transmission parameters value of described portable terminal is: during the former Serving cell signal transmission quality of portable terminal/signal receiving strength, described step b specifically comprises:
, when the very first time, the decline variable quantity at interval was less than first thresholding, reduces absolute thresholding and break the decision threshold that portable terminal and former Serving cell link at former Serving cell signal transmission quality/signal receiving strength of determining described portable terminal; Or
, when the very first time, the decline pace of change at interval was less than second thresholding, reduces absolute thresholding and break the decision threshold that portable terminal and former Serving cell link at former Serving cell signal transmission quality/signal receiving strength of determining described portable terminal;
When the signal transmission parameters value of described portable terminal is: during the former Serving cell signal transmission attenuation of portable terminal/propagation delay, described step b specifically comprises:
When the very first time, the rising variable quantity at interval was less than first thresholding, improve the decision threshold that absolute thresholding breaks loss/propagation delay that portable terminal and former Serving cell link at former Serving cell signal transmission attenuation/propagation delay of determining described portable terminal; Or
When the very first time, the rising pace of change at interval was less than second thresholding, improve the decision threshold that absolute thresholding breaks loss/propagation delay that portable terminal and former Serving cell link at former Serving cell signal transmission attenuation/propagation delay of determining described portable terminal.
When the signal transmission parameters value of described portable terminal is: during the former Serving cell signal transmission quality of portable terminal/signal receiving strength, described step b specifically comprises:
, when the very first time, the decline variable quantity at interval was greater than first thresholding, improves absolute thresholding and break the decision threshold that portable terminal and former Serving cell link at former Serving cell signal transmission quality/signal receiving strength of determining described portable terminal; Or
, when the very first time, the decline pace of change at interval was greater than second thresholding, improves absolute thresholding and break the decision threshold that portable terminal and former Serving cell link at former Serving cell signal transmission quality/signal receiving strength of determining described portable terminal;
When the signal transmission parameters value of described portable terminal is: during the former Serving cell signal transmission attenuation of portable terminal/propagation delay, described step b specifically comprises:
When the very first time, the rising variable quantity at interval was greater than first thresholding, reduce the decision threshold that absolute thresholding breaks loss/propagation delay that portable terminal and former Serving cell link at former Serving cell signal transmission attenuation/propagation delay of determining described portable terminal; Or
When the very first time, the rising pace of change at interval was greater than second thresholding, reduce the decision threshold that absolute thresholding breaks loss/propagation delay that portable terminal and former Serving cell link at former Serving cell signal transmission attenuation/propagation delay of determining described portable terminal.
When the signal transmission parameters value of described portable terminal is: during the neighbor cell signal transmission quality of portable terminal/signal receiving strength, described step b specifically comprises:
At the rising variable quantity of signal transmission quality/signal receiving strength in second time interval of the neighbor cell of determining described portable terminal during, improve the decision threshold that portable terminal in the absolute thresholding switches to Target cell less than the 3rd thresholding; Or
In the rising pace of change of neighbor cell signal transmission parameter values in second time interval of determining described portable terminal during, improve the decision threshold that portable terminal in the absolute thresholding switches to Target cell less than the 4th thresholding;
When the signal transmission parameters value of described portable terminal is: during the neighbor cell signal loss of portable terminal/propagation delay, described step b specifically comprises:
At the decline variable quantity of signal transmission attenuation/propagation delay in second time interval of the neighbor cell of determining described portable terminal during, reduce the decision threshold that portable terminal in the absolute thresholding switches to the loss/propagation delay of Target cell less than the 3rd thresholding; Or
In the decline pace of change of signal transmission attenuation/propagation delay in second time interval of the neighbor cell of determining described portable terminal during, reduce the decision threshold that portable terminal in the absolute thresholding switches to the loss/propagation delay of Target cell less than the 4th thresholding.
When the signal transmission parameters value of described portable terminal is: during the neighbor cell signal transmission quality of portable terminal/signal receiving strength, described step b specifically comprises:
At the rising variable quantity of signal transmission quality/signal receiving strength in second time interval of the neighbor cell of determining described portable terminal during, reduce the decision threshold that portable terminal in the absolute thresholding switches to Target cell greater than the 3rd thresholding; Or
In the rising pace of change of neighbor cell signal transmission quality/signal receiving strength in second time interval of determining described portable terminal during, reduce the decision threshold that portable terminal in the absolute thresholding switches to Target cell greater than the 4th thresholding;
When the signal transmission parameters value of described portable terminal is: during the neighbor cell signal loss of portable terminal/propagation delay, described step b specifically comprises:
At the decline variable quantity of signal transmission attenuation/propagation delay in second time interval of the neighbor cell of determining described portable terminal during, improve the decision threshold that portable terminal in the absolute thresholding switches to the loss/propagation delay of Target cell greater than the 3rd thresholding; Or
In the decline pace of change of neighbor cell signal loss/propagation delay in second time interval of determining described portable terminal during, improve the decision threshold that portable terminal in the absolute thresholding switches to the loss/propagation delay of Target cell greater than the 4th thresholding.
When the signal transmission parameters value of described portable terminal is: when the former Serving cell of portable terminal and the signal transmission quality of neighbor cell/signal receiving strength, described step b specifically comprises:
During less than the 5th thresholding, improve the switching relative threshold in the rising variable quantity sum of neighbor cell signal transmission quality/signal receiving strength in the 3rd time interval of the decline variable quantity of former Serving cell signal transmission quality/signal receiving strength of determining portable terminal in the 3rd time interval and portable terminal;
When the signal transmission parameters value of described portable terminal is: when the former Serving cell of portable terminal and the signal transmission attenuation of neighbor cell/propagation delay, described step b specifically comprises:
During less than the 5th thresholding, improve the switching relative threshold in the decline variable quantity sum of neighbor cell signal loss/propagation delay in the 3rd time interval of the rising variable quantity of former Serving cell signal transmission attenuation/propagation delay of determining portable terminal in the 3rd time interval and portable terminal.
When the signal transmission parameters value of described portable terminal is: when the former Serving cell of portable terminal and the signal transmission quality of neighbor cell/signal receiving strength, described step b specifically comprises:
During greater than the 5th thresholding, reduce the switching relative threshold in the rising variable quantity sum of neighbor cell signal transmission quality/signal receiving strength in the 5th time interval of the decline variable quantity of former Serving cell signal transmission quality/signal receiving strength of determining portable terminal in the 5th time interval and portable terminal;
When the signal transmission parameters value of described portable terminal is: when the former Serving cell of portable terminal and the signal transmission attenuation of neighbor cell/propagation delay, described step b specifically comprises:
During greater than the 5th thresholding, reduce the switching relative threshold in the decline variable quantity sum of neighbor cell signal loss/propagation delay in the 5th time interval of the rising variable quantity of former Serving cell signal transmission attenuation/propagation delay of determining portable terminal in the 5th time interval and portable terminal.
The present invention also provides the switched system in a kind of mobile radio system, comprising:
Measuring-signal transmission parameter module: obtain the signal transmission parameters value of portable terminal, and it is reported to adjustment decision threshold module and judgement and handover module;
Adjust the decision threshold module: when the signal transmission parameters value of determining the portable terminal that measuring-signal transmission parameter module reports satisfies predetermined condition, dynamically adjust the switch decision thresholding; Described switch decision thresholding comprises: portable terminal disconnects the absolute thresholding that the absolute thresholding that links with former sub-district and portable terminal switch to the adjacent target sub-district;
Judgement and handover module: the switch decision and the handoff procedure that carry out portable terminal according to the switch decision thresholding of described adjustment decision threshold module adjustment, signal transmission parameters value that measuring-signal transmission parameter module reports.
Description by technique scheme as can be known, the present invention can be according to the former sub-district of portable terminal, the downstream signal transmission quality of neighbor cell, loss, the pre-estimation method of signal transmission parameters variation tendencies such as propagation delay is dynamically adjusted the switch decision thresholding of portable terminal, as adjust and disconnect the decision threshold H_ADD that MS and former Serving cell link, MS switches to the decision threshold H_ADD of Target cell, the relative threshold hysteresis of switch decision etc., make the present invention whether initiate in advance to switch according to the concrete condition decision of each sub-district link downstream signal, effectively prevented the call drop phenomenon in the handoff procedure, and the present invention can guarantee to switch the Serving cell signal transmission quality of portable terminal after finishing with the stable neighbor cell that rises of signal transmission quality as candidate target cells; The present invention can be widely used in various mobile radio systems such as Wimax, WCDMA; Thereby realized the raising handover success rate by technical scheme provided by the invention, improved the purpose of resource utilization ratio.
Description of drawings
Fig. 1 is the switched system schematic diagram in the mobile radio system of the present invention.
Embodiment
If can pre-estimate out the former Serving cell downlink signal transmissions quality of portable terminal will worsen rapidly, then can fulfil handoff procedure ahead of schedule, effectively to avoid worsening the call drop phenomenon that causes rapidly because of former cellular downlink signal transmission quality in the handoff procedure by dynamic adjustment decision threshold; If can pre-estimate out the ascendant trend and the stability of the neighbor cell downlink signal transmissions quality of portable terminal, then can by dynamically adjust decision threshold with the stable neighbor cell that rises of signal transmission quality as candidate target cells, with guarantee to switch finish after the Serving cell signal transmission quality of portable terminal; Thereby can effectively improve handover success rate, improve resource utilization ratio.
Therefore, core of the present invention is: the signal transmission parameters value of obtaining portable terminal, when definite described signal transmission parameters value satisfies predetermined condition, dynamically adjust the switch decision thresholding, carry out the switch decision and the handoff procedure of portable terminal according to described adjusted switch decision thresholding.
Based on core concept of the present invention technical scheme provided by the invention is further described below.
The present invention can be widely used in the various wireless communication systems, as being suitable in wireless communication systems such as Wimax, WCDMA.
For preventing in handoff procedure, former Serving cell downlink signal transmissions quality worsens rapidly and the call drop phenomenon that causes, and the present invention need initiate to switch before former link signal transmission quality does not worsen in advance; For guarantee switching the signal transmission quality of finishing the new Serving cell of back portable terminal, the present invention need be when switching with the adjacent sub-district of the stable rising of signal transmission quality as Target cell.The selection of amount of switched and Target cell in advance all can be controlled by decision threshold.
The present invention is based on the absolute thresholding of dynamic adjustment and realize that the method for switching is:
Step 1, measure and report process.MS carries out the measurement of former sub-district and neighbor cell earlier, and the content of measurement is the signal transmission parameters that switch decision need be used, and mainly is signal transmission quality, as the signal to noise ratio of signal, error rate or the like.Signal transmission parameters among the present invention also can be propagation delay of loss on received signal intensity, the wireless path and region, edge etc.Measurement result can adopt Event triggered to report or mode such as periodically report to report.
Step 2, switch decision process.Be signal transmission parameters below with SNR, switch decision process of the present invention is described.
The present invention adjusts the process that disconnects the decision threshold H_DROP that MS and former Serving cell link:
Setting SNR_Serving BS is former Serving cell down link signal signal to noise ratio, SNR_Target BS is a Target cell down link signal signal to noise ratio, Δ SNR_serving_ref is the adjustment thresholding of judgement adjustment H_DROP numerical values recited, and Δ SNR_target_ref adjusts the adjustment thresholding of H_ADD numerical values recited for judgement.
At first, measure MS and former Serving cell link downstream signal signal to noise ratio snr _ Serving BS, then, determine in the Δ T1 time, the variation delta SNR_Serving BS that SNR_Serving BS descends, and the size of judgement Δ SNR_Serving BS and Δ SNR_serving_ref, the Δ SNR_Serving BS if SNR_Serving BS has descended, and Δ SNR_Seving BS is less than Δ SNR_serving_ref, determine that then former little service area downstream signal transmission quality decrease speed is slow, should reduce disconnection MS and the link-attached decision threshold H_DROP of former Serving cell; The Δ SNR_Serving BS if SNR_Serving BS has descended, and Δ SNR_Serving BS is greater than Δ SNR_serving_ref, determine that then former Serving cell signal transmission quality decrease speed is fast, the MS signal transmission quality worsens fast, should improve to disconnect MS and the link-attached decision threshold H_DROP in former sub-district.
The condition of above-mentioned reduction H_DROP also can be revised as: in the Δ T1 time, and SNR_Serving BS descended Δ SNR_Serving BS and Δ SNR_Serving BS/ Δ T1＜k_ref1.Equally, the condition of the above-mentioned H_DROP of providing also can be revised as: in the Δ T1 time, and SNR_Serving BS descended Δ SNR_Serving BS and SNR_Serving BS/ Δ T1〉k_ref1.Wherein: k_ref1 adjusts the adjustment thresholding of H_DROP size for judgement.
The present invention adjusts the process that MS switches to the decision threshold H_ADD of Target cell:
At first, measure neighbor cell down link signal signal to noise ratio snr _ Target BS of MS, then, determine in the Δ T2 time, the variation delta SNR_Target BS that SNR_Target BS rises, and the size of judgement Δ SNR_Target BS and Δ SNR_target_ref, the Δ SNR_Target BS if SNR_Target BS has risen, and Δ SNR_Target BS is less than Δ SNR_target_ref, it is slow to determine that then the Target cell signal transmission quality rises, and should improve the decision threshold H_ADD that MS switches to Target cell; The Δ SNR_Target BS if SNR_Target BS has risen, and Δ SNR_Target BS is greater than Δ SNR_target_ref, and it is fast to determine that then the Target cell signal transmission quality rises, and should reduce the decision threshold H_ADD that MS switches to Target cell.
The condition of above-mentioned raising H_ADD also can be revised as: in the Δ T2 time, and the SNR_Target BS Δ SNR_Target BS that risen, and Δ SNR_target BS/ Δ T2 is less than k_ref2.Equally, the condition that reduces H_ADD also can be revised as: in the Δ T2 time, and the SNR_Target BS Δ SNR_Target BS that risen, and Δ SNR_target BS/ Δ T2 is greater than k_ref2.Wherein: k_ref2 is for needing to adjust the adjustment thresholding of H size.
The numerical value of above-mentioned Δ T2 and Δ T1 can be set to identical, also can be set to inequality.
Like this, as former Serving cell link downstream signal signal to noise ratio snr _ Serving BS＜H_DROP and SNR_Target BS〉during H_ADD, determine and to switch, when switching, must select those adjacent sub-districts of satisfying above-mentioned requirements as candidate target cells, that is to say that the signal transmission quality of Target cell should the minimum H_ADD that is higher than.
To step 3, execution handoff procedure.Behind the switch decision, promptly carry out and switch.MS cuts off the link with former sub-district, sets up synchronously with Target cell, sets up new Radio Link and connects.
By top description as can be known, the present invention can dynamically adjust decision threshold H_ADD and H_DROP according to the pre-estimation method of the downstream signal transmission quality variation tendency of former sub-district, neighbor cell, make the present invention whether initiate in advance to switch according to the concrete condition decision of each sub-district link downstream signal transmission quality, thereby effectively prevented the call drop phenomenon, improve handover success rate, improved resource utilization ratio.
Be that to be example with SNR as the gauge signal transmission quality realize that by the absolute thresholding of dynamic adjustment the method for switching is described to of the present invention above, if portable terminal moves at cell edge, can bring the error rate to rise, the propagated time delay rises, signal transmission attenuation rises, just in time corresponding with the decline of SNR, like this, if with the error rate, signal error transfer rates such as Packet Error Ratio are as the gauge signal transmission quality, perhaps with signal transmission attenuation, parameters such as propagated time delay are as the judgement amount of adjusting decision threshold, its implementation procedure is similar substantially to the description in the foregoing description, it is parameter variation tendency, promptly rise and decline and foregoing description on the contrary, below with signal transmission attenuation, the propagated time delay is that example is simply described the process that the present invention adjusts the switch decision thresholding.
Determine the rising variable quantity of loss/propagation delay in the Δ T1 time of the former Serving cell of portable terminal, and judge the size of this rising variable quantity and predetermined threshold 1, if should the rising variable quantity less than predetermined threshold 1, determine that then former little service area downstream signal transmission quality decrease speed is slow, should improve the decision threshold H_DROP that disconnects MS and the link-attached loss/propagation delay of former Serving cell; If should the rising variable quantity greater than predetermined threshold 1, determine that then former Serving cell signal transmission quality decrease speed is fast, the MS signal transmission quality worsens fast, should reduce the decision threshold H_DROP that disconnects MS and the link-attached loss/propagation delay in former sub-district.
Determine the decline variable quantity of loss/propagation delay in the Δ T2 time of the neighbor cell of portable terminal, and judge the size of this decline variable quantity and predetermined threshold 3, if the decline variable quantity is less than predetermined threshold 3, it is slow to determine that then the Target cell signal transmission quality descends, and should reduce the decision threshold H_ADD that MS switches to the loss/propagation delay of Target cell; If should the decline variable quantity greater than predetermined threshold 3, it is fast to determine that then the Target cell signal transmission quality rises, and should improve the decision threshold H_ADD that MS switches to the loss/propagation delay of Target cell.
The condition of above-mentioned raising H_DROP also can be revised as: in the Δ T1 time, the rate of climb of loss/propagation delay is less than predetermined threshold 2.Equally, the condition of above-mentioned reduction H_DROP also can be revised as: in the Δ T1 time, the rate of climb of loss/propagation delay is greater than predetermined threshold 2.
The condition of above-mentioned reduction H_ADD also can be revised as: in the Δ T2 time, the decrease speed of loss/propagation delay is less than predetermined threshold 4.Equally, the condition of raising H_ADD also can be revised as: in the Δ T2 time, the decrease speed of loss/propagation delay is greater than predetermined threshold 4.
The present invention is based on dynamic adjustment relative threshold and realize that the method for switching is:
Step 1, MS carry out the measurement of former sub-district and neighbor cell earlier, and the content of measurement is the signal transmission parameters that switch decision need be used, and mainly are received signal intensity and signal transmission quality, as the signal to noise ratio of signal, error rate or the like.Signal transmission parameters among the present invention also can be propagation delay of loss on the wireless path and region, edge etc.Measurement result can adopt Event triggered to report or mode such as periodically report to report.
Step 2, switch decision process.Be signal transmission parameters below with SNR, switch decision process of the present invention is described.
Setting SNR_Serving BS is former Serving cell down link signal signal to noise ratio, SNR_Target BS is a Target cell down link signal signal to noise ratio, hysteresis is the relative threshold of switch decision, and switches during BS as SNR_Serving BS+hysteresis＜SNR_target.
At first, measure MS and former Serving cell down link signal signal to noise ratio snr _ Serving BS and Target cell down link signal signal to noise ratio snr _ Target BS, then, in the Δ T3 time, judge the variation tendency of SNR_ServingBS and SNR_target_ref, the Δ SNR_ServingBS if SNR_Serving BS has descended, SNR_Target BS's Δ SNR_Target BS has risen, and Δ SNR_Serving BS+ Δ SNR_Target BS is less than Δ SNR_ref, the difference variation of then determining former sub-district and Target cell downlink signal transmissions quality is slow, should improve the relative threshold hysteresis of switch decision; The Δ SNR_Serving BS if SNR_ServingBS has descended, SNR_Target BS's Δ SNR_Target BS has risen, and Δ SNR_Serving BS+ Δ SNR_Target BS is greater than Δ SNR_ref, the difference of then determining former sub-district and Target cell downlink signal transmissions quality changes soon, should reduce the relative threshold hysteresis of switch decision.
Like this, when SNR_Serving BS+hysteresis＜SNR_target BS, when that is to say Target cell downlink signal transmissions quality at least than former good hysteresis of Serving cell downlink signal transmissions quality, determine and to switch, when switching, must select those adjacent sub-districts of satisfying above-mentioned requirements as candidate target cells.
Step 3, execution handoff procedure.Behind the switch decision, promptly carry out and switch.MS cuts off the link with former sub-district, sets up synchronously with Target cell, sets up new Radio Link and connects.
By top description as can be known, the present invention can dynamically adjust decision threshold hysteresis according to the pre-estimation method of the downstream signal transmission quality variation tendency of former sub-district, neighbor cell, make the present invention whether initiate in advance to switch according to the concrete condition decision of each sub-district link downstream signal transmission quality, thereby effectively prevented the call drop phenomenon, improve handover success rate, improved resource utilization ratio.
Be to be that example realizes that by dynamic adjustment relative threshold the method for switching is described to of the present invention with SNR above, if portable terminal moves at cell edge, can bring the error rate to rise, the propagated time delay rises, signal transmission attenuation rises, just in time corresponding with the decline of SNR, like this, if with the error rate, signal error transfer rates such as Packet Error Ratio are as the gauge signal transmission quality, perhaps with signal transmission attenuation, parameters such as propagated time delay are as the judgement amount of adjusting decision threshold, its implementation procedure is similar substantially to the description in the foregoing description, it is parameter variation tendency, promptly rise and decline and foregoing description on the contrary, below with signal transmission attenuation, the propagated time delay is that example is simply described the process that the present invention adjusts the switch decision thresholding.
In the Δ T3 time, determine MS respectively with the propagated time delay/signal transmission attenuation of former Serving cell and Target cell, and judge the variation tendency of the propagated time delay/signal transmission attenuation of former Serving cell and Target cell, if the propagated time delay of the propagated of former Serving cell time delay/signal transmission attenuation rising variable quantity and Target cell/signal transmission attenuation decline variable quantity sum is less than predetermined threshold 5, the difference variation of then determining former sub-district and Target cell downlink signal transmissions quality is slow, should improve the relative threshold hysteresis of switch decision; If the propagated time delay of the propagated of former Serving cell time delay/signal transmission attenuation rising variable quantity and Target cell/signal transmission attenuation decline variable quantity sum is greater than predetermined threshold 5, the difference of then determining former sub-district and Target cell downlink signal transmissions quality changes soon, should reduce the relative threshold hysteresis of switch decision
Switched system in the mobile radio system provided by the invention as shown in Figure 1.
In Fig. 1, switched system of the present invention comprises: measuring-signal transmission parameter module, adjustment decision threshold module, judgement and handover module.
The main effect of measuring-signal transmission parameter module is to obtain the signal transmission parameters value of portable terminal, and will report to adjustment decision threshold module and judgement and handover module.
Adjust the decision threshold module: the signal transmission parameters of the portable terminal that reports according to measuring-signal transmission parameter module, determine the variation tendency of at interval interior signal transmission parameters at the fixed time, and when the variation tendency of signal transmission parameters meets some requirements, dynamically adjust the switch decision thresholding.
Adjust the decision threshold module and can adjust arbitrary decision threshold among the relative threshold hysteresis of the decision threshold H_DROP that disconnects MS and former Serving cell and link, decision threshold H_ADD that MS switches to Target cell and switch decision, or adjust the decision threshold of any two combinations in the above-mentioned thresholding simultaneously, or adjust above-mentioned three decision thresholds simultaneously.Adjust the decision threshold module and adjust the process of each decision threshold such as the description in the above-mentioned embodiment changing method, be not described in detail at this.
Judgement and handover module: the signal transmission parameters value of the portable terminal that reports according to the switch decision thresholding and the measuring-signal transmission parameter module of described adjusting module adjustment is carried out the switch decision and the handoff procedure of portable terminal.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, and the claim of application documents of the present invention comprises these distortion and variation.
Claims (16)
1, the changing method in a kind of mobile radio system is characterized in that, comprising:
A, obtain the signal transmission parameters value of portable terminal;
B, when definite described signal transmission parameters value satisfies predetermined condition, dynamically adjust the switch decision thresholding; Described switch decision thresholding comprises: absolute thresholding;
C, carry out the switch decision and the handoff procedure of portable terminal according to described adjusted switch decision thresholding;
When the signal transmission parameters value of described portable terminal is: during the former Serving cell signal transmission quality of portable terminal/signal receiving strength, described step b specifically comprises:
, when the very first time, the decline variable quantity at interval was less than first thresholding, reduces absolute thresholding and break the decision threshold that portable terminal and former Serving cell link at former Serving cell signal transmission quality/signal receiving strength of determining described portable terminal; Or
, when the very first time, the decline pace of change at interval was less than second thresholding, reduces absolute thresholding and break the decision threshold that portable terminal and former Serving cell link at former Serving cell signal transmission quality/signal receiving strength of determining described portable terminal;
Perhaps the signal transmission parameters value when described portable terminal is: during the former Serving cell signal transmission attenuation of portable terminal/propagation delay, described step b specifically comprises:
When the very first time, the rising variable quantity at interval was less than first thresholding, improve the decision threshold that absolute thresholding breaks loss/propagation delay that portable terminal and former Serving cell link at former Serving cell signal transmission attenuation/propagation delay of determining described portable terminal; Or
When the very first time, the rising pace of change at interval was less than second thresholding, improve the decision threshold that absolute thresholding breaks loss/propagation delay that portable terminal and former Serving cell link at former Serving cell signal transmission attenuation/propagation delay of determining described portable terminal.
2, the changing method in a kind of mobile radio system as claimed in claim 1 is characterized in that, described switch decision thresholding also comprises: switch relative threshold.
3, the changing method in a kind of mobile radio system is characterized in that, comprising:
A, obtain the signal transmission parameters value of portable terminal;
B, when definite described signal transmission parameters value satisfies predetermined condition, dynamically adjust the switch decision thresholding; Described switch decision thresholding comprises: absolute thresholding;
C, carry out the switch decision and the handoff procedure of portable terminal according to described adjusted switch decision thresholding; When the signal transmission parameters value of described portable terminal is: during the former Serving cell signal transmission quality of portable terminal/signal receiving strength, described step b specifically comprises:
, when the very first time, the decline variable quantity at interval was greater than first thresholding, improves absolute thresholding and break the decision threshold that portable terminal and former Serving cell link at former Serving cell signal transmission quality/signal receiving strength of determining described portable terminal; Or
, when the very first time, the decline pace of change at interval was greater than second thresholding, improves absolute thresholding and break the decision threshold that portable terminal and former Serving cell link at former Serving cell signal transmission quality/signal receiving strength of determining described portable terminal;
Perhaps the signal transmission parameters value when described portable terminal is: during the former Serving cell signal transmission attenuation of portable terminal/propagation delay, described step b specifically comprises:
When the very first time, the rising variable quantity at interval was greater than first thresholding, reduce the decision threshold that absolute thresholding breaks loss/propagation delay that portable terminal and former Serving cell link at former Serving cell signal transmission attenuation/propagation delay of determining described portable terminal; Or
When the very first time, the rising pace of change at interval was greater than second thresholding, reduce the decision threshold that absolute thresholding breaks loss/propagation delay that portable terminal and former Serving cell link at former Serving cell signal transmission attenuation/propagation delay of determining described portable terminal.
4, the changing method in a kind of mobile radio system as claimed in claim 3 is characterized in that, described switch decision thresholding also comprises: switch relative threshold.
5, the changing method in a kind of mobile radio system is characterized in that, comprising:
A, obtain the signal transmission parameters value of portable terminal;
B, when definite described signal transmission parameters value satisfies predetermined condition, dynamically adjust the switch decision thresholding; Described switch decision thresholding comprises: absolute thresholding;
C, carry out the switch decision and the handoff procedure of portable terminal according to described adjusted switch decision thresholding;
When the signal transmission parameters value of described portable terminal is: during the neighbor cell signal transmission quality of portable terminal/signal receiving strength, described step b specifically comprises:
At the rising variable quantity of signal transmission quality/signal receiving strength in second time interval of the neighbor cell of determining described portable terminal during, improve the decision threshold that portable terminal in the absolute thresholding switches to Target cell less than the 3rd thresholding; Or
In the rising pace of change of neighbor cell signal transmission parameter values in second time interval of determining described portable terminal during, improve the decision threshold that portable terminal in the absolute thresholding switches to Target cell less than the 4th thresholding;
Perhaps the signal transmission parameters value when described portable terminal is: during the neighbor cell signal loss of portable terminal/propagation delay, described step b specifically comprises:
At the decline variable quantity of signal transmission attenuation/propagation delay in second time interval of the neighbor cell of determining described portable terminal during, reduce the decision threshold that portable terminal in the absolute thresholding switches to the loss/propagation delay of Target cell less than the 3rd thresholding; Or
In the decline pace of change of signal transmission attenuation/propagation delay in second time interval of the neighbor cell of determining described portable terminal during, reduce the decision threshold that portable terminal in the absolute thresholding switches to the loss/propagation delay of Target cell less than the 4th thresholding.
6, the changing method in a kind of mobile radio system as claimed in claim 5 is characterized in that, described switch decision thresholding also comprises: switch relative threshold.
7, the changing method in a kind of mobile radio system is characterized in that, comprising:
A, obtain the signal transmission parameters value of portable terminal;
B, when definite described signal transmission parameters value satisfies predetermined condition, dynamically adjust the switch decision thresholding; Described switch decision thresholding comprises: absolute thresholding;
C, carry out the switch decision and the handoff procedure of portable terminal according to described adjusted switch decision thresholding;
When the signal transmission parameters value of described portable terminal is: during the neighbor cell signal transmission quality of portable terminal/signal receiving strength, described step b specifically comprises:
At the rising variable quantity of signal transmission quality/signal receiving strength in second time interval of the neighbor cell of determining described portable terminal during, reduce the decision threshold that portable terminal in the absolute thresholding switches to Target cell greater than the 3rd thresholding; Or
In the rising pace of change of neighbor cell signal transmission quality/signal receiving strength in second time interval of determining described portable terminal during, reduce the decision threshold that portable terminal in the absolute thresholding switches to Target cell greater than the 4th thresholding;
Perhaps the signal transmission parameters value when described portable terminal is: during the neighbor cell signal loss of portable terminal/propagation delay, described step b specifically comprises:
At the decline variable quantity of signal transmission attenuation/propagation delay in second time interval of the neighbor cell of determining described portable terminal during, improve the decision threshold that portable terminal in the absolute thresholding switches to the loss/propagation delay of Target cell greater than the 3rd thresholding; Or
In the decline pace of change of neighbor cell signal loss/propagation delay in second time interval of determining described portable terminal during, improve the decision threshold that portable terminal in the absolute thresholding switches to the loss/propagation delay of Target cell greater than the 4th thresholding.
8, the changing method in a kind of mobile radio system as claimed in claim 7 is characterized in that, described switch decision thresholding also comprises: switch relative threshold.
9, the changing method in a kind of mobile radio system is characterized in that, comprising:
A, obtain the signal transmission parameters value of portable terminal;
B, when definite described signal transmission parameters value satisfies predetermined condition, dynamically adjust the switch decision thresholding; Described switch decision thresholding comprises: switch relative threshold;
C, carry out the switch decision and the handoff procedure of portable terminal according to described adjusted switch decision thresholding;
When the signal transmission parameters value of described portable terminal is: when the former Serving cell of portable terminal and the signal transmission quality of neighbor cell/signal receiving strength, described step b specifically comprises:
During less than the 5th thresholding, improve the switching relative threshold in the rising variable quantity sum of neighbor cell signal transmission quality/signal receiving strength in the 3rd time interval of the decline variable quantity of former Serving cell signal transmission quality/signal receiving strength of determining portable terminal in the 3rd time interval and portable terminal;
Perhaps the signal transmission parameters value when described portable terminal is: when the former Serving cell of portable terminal and the signal transmission attenuation of neighbor cell/propagation delay, described step b specifically comprises:
During less than the 5th thresholding, improve the switching relative threshold in the decline variable quantity sum of neighbor cell signal loss/propagation delay in the 3rd time interval of the rising variable quantity of former Serving cell signal transmission attenuation/propagation delay of determining portable terminal in the 3rd time interval and portable terminal.
10, the changing method in a kind of mobile radio system is characterized in that, comprising:
A, obtain the signal transmission parameters value of portable terminal;
B, when definite described signal transmission parameters value satisfies predetermined condition, dynamically adjust the switch decision thresholding; Described switch decision thresholding comprises: switch relative threshold;
C, carry out the switch decision and the handoff procedure of portable terminal according to described adjusted switch decision thresholding;
When the signal transmission parameters value of described portable terminal is: when the former Serving cell of portable terminal and the signal transmission quality of neighbor cell/signal receiving strength, described step b specifically comprises:
During greater than the 5th thresholding, reduce the switching relative threshold in the rising variable quantity sum of neighbor cell signal transmission quality/signal receiving strength in the 5th time interval of the decline variable quantity of former Serving cell signal transmission quality/signal receiving strength of determining portable terminal in the 5th time interval and portable terminal;
Perhaps the signal transmission parameters value when described portable terminal is: when the former Serving cell of portable terminal and the signal transmission attenuation of neighbor cell/propagation delay, described step b specifically comprises:
During greater than the 5th thresholding, reduce the switching relative threshold in the decline variable quantity sum of neighbor cell signal loss/propagation delay in the 5th time interval of the rising variable quantity of former Serving cell signal transmission attenuation/propagation delay of determining portable terminal in the 5th time interval and portable terminal.
11, the switched system in a kind of mobile radio system is characterized in that, comprising:
Measuring-signal transmission parameter module: obtain the signal transmission parameters value of portable terminal, and it is reported to adjustment decision threshold module and judgement and handover module;
Adjust the decision threshold module: when the signal transmission parameters value of determining the portable terminal that measuring-signal transmission parameter module reports satisfies predetermined condition, dynamically adjust the switch decision thresholding; Described switch decision thresholding comprises: absolute thresholding;
Judgement and handover module: the switch decision and the handoff procedure that carry out portable terminal according to the switch decision thresholding of described adjustment decision threshold module adjustment, signal transmission parameters value that measuring-signal transmission parameter module reports;
When the signal transmission parameters value of described portable terminal is: during the former Serving cell signal transmission quality of portable terminal/signal receiving strength, described adjustment decision threshold module is used for:
, when the very first time, the decline variable quantity at interval was less than first thresholding, reduces absolute thresholding and break the decision threshold that portable terminal and former Serving cell link at former Serving cell signal transmission quality/signal receiving strength of determining described portable terminal; Or
, when the very first time, the decline pace of change at interval was less than second thresholding, reduces absolute thresholding and break the decision threshold that portable terminal and former Serving cell link at former Serving cell signal transmission quality/signal receiving strength of determining described portable terminal;
Perhaps the signal transmission parameters value when described portable terminal is: during the former Serving cell signal transmission attenuation of portable terminal/propagation delay, adjust the decision threshold module and be used for:
When the very first time, the rising variable quantity at interval was less than first thresholding, improve the decision threshold that absolute thresholding breaks loss/propagation delay that portable terminal and former Serving cell link at former Serving cell signal transmission attenuation/propagation delay of determining described portable terminal; Or
When the very first time, the rising pace of change at interval was less than second thresholding, improve the decision threshold that absolute thresholding breaks loss/propagation delay that portable terminal and former Serving cell link at former Serving cell signal transmission attenuation/propagation delay of determining described portable terminal.
12, the switched system in a kind of mobile radio system is characterized in that, comprising:
Measuring-signal transmission parameter module: obtain the signal transmission parameters value of portable terminal, and it is reported to adjustment decision threshold module and judgement and handover module;
Adjust the decision threshold module: when the signal transmission parameters value of determining the portable terminal that measuring-signal transmission parameter module reports satisfies predetermined condition, dynamically adjust the switch decision thresholding; Described switch decision thresholding comprises: absolute thresholding;
Judgement and handover module: the switch decision and the handoff procedure that carry out portable terminal according to the switch decision thresholding of described adjustment decision threshold module adjustment, signal transmission parameters value that measuring-signal transmission parameter module reports;
When the signal transmission parameters value of described portable terminal is: during the former Serving cell signal transmission quality of portable terminal/signal receiving strength, described adjustment decision threshold module is used for:
, when the very first time, the decline variable quantity at interval was greater than first thresholding, improves absolute thresholding and break the decision threshold that portable terminal and former Serving cell link at former Serving cell signal transmission quality/signal receiving strength of determining described portable terminal; Or
, when the very first time, the decline pace of change at interval was greater than second thresholding, improves absolute thresholding and break the decision threshold that portable terminal and former Serving cell link at former Serving cell signal transmission quality/signal receiving strength of determining described portable terminal;
Perhaps the signal transmission parameters value when described portable terminal is: during the former Serving cell signal transmission attenuation of portable terminal/propagation delay, described adjustment decision threshold module is used for:
When the very first time, the rising variable quantity at interval was greater than first thresholding, reduce the decision threshold that absolute thresholding breaks loss/propagation delay that portable terminal and former Serving cell link at former Serving cell signal transmission attenuation/propagation delay of determining described portable terminal; Or
When the very first time, the rising pace of change at interval was greater than second thresholding, reduce the decision threshold that absolute thresholding breaks loss/propagation delay that portable terminal and former Serving cell link at former Serving cell signal transmission attenuation/propagation delay of determining described portable terminal.
13, the switched system in a kind of mobile radio system is characterized in that, comprising:
Measuring-signal transmission parameter module: obtain the signal transmission parameters value of portable terminal, and it is reported to adjustment decision threshold module and judgement and handover module;
Adjust the decision threshold module: when the signal transmission parameters value of determining the portable terminal that measuring-signal transmission parameter module reports satisfies predetermined condition, dynamically adjust the switch decision thresholding; Described switch decision thresholding comprises: absolute thresholding;
Judgement and handover module: the switch decision and the handoff procedure that carry out portable terminal according to the switch decision thresholding of described adjustment decision threshold module adjustment, signal transmission parameters value that measuring-signal transmission parameter module reports;
When the signal transmission parameters value of described portable terminal is: during the neighbor cell signal transmission quality of portable terminal/signal receiving strength, described adjustment decision threshold module is used for:
At the rising variable quantity of signal transmission quality/signal receiving strength in second time interval of the neighbor cell of determining described portable terminal during, improve the decision threshold that portable terminal in the absolute thresholding switches to Target cell less than the 3rd thresholding; Or
In the rising pace of change of neighbor cell signal transmission parameter values in second time interval of determining described portable terminal during, improve the decision threshold that portable terminal in the absolute thresholding switches to Target cell less than the 4th thresholding;
Perhaps the signal transmission parameters value when described portable terminal is: during the neighbor cell signal loss of portable terminal/propagation delay, described adjustment decision threshold module is used for:
At the decline variable quantity of signal transmission attenuation/propagation delay in second time interval of the neighbor cell of determining described portable terminal during, reduce the decision threshold that portable terminal in the absolute thresholding switches to the loss/propagation delay of Target cell less than the 3rd thresholding; Or
In the decline pace of change of signal transmission attenuation/propagation delay in second time interval of the neighbor cell of determining described portable terminal during, reduce the decision threshold that portable terminal in the absolute thresholding switches to the loss/propagation delay of Target cell less than the 4th thresholding.
14, the switched system in a kind of mobile radio system is characterized in that, comprising:
Measuring-signal transmission parameter module: obtain the signal transmission parameters value of portable terminal, and it is reported to adjustment decision threshold module and judgement and handover module;
Adjust the decision threshold module: when the signal transmission parameters value of determining the portable terminal that measuring-signal transmission parameter module reports satisfies predetermined condition, dynamically adjust the switch decision thresholding; Described switch decision thresholding comprises: absolute thresholding;
Judgement and handover module: the switch decision and the handoff procedure that carry out portable terminal according to the switch decision thresholding of described adjustment decision threshold module adjustment, signal transmission parameters value that measuring-signal transmission parameter module reports;
When the signal transmission parameters value of described portable terminal is: during the neighbor cell signal transmission quality of portable terminal/signal receiving strength, described adjustment decision threshold module is used for:
At the rising variable quantity of signal transmission quality/signal receiving strength in second time interval of the neighbor cell of determining described portable terminal during, reduce the decision threshold that portable terminal in the absolute thresholding switches to Target cell greater than the 3rd thresholding; Or
In the rising pace of change of neighbor cell signal transmission quality/signal receiving strength in second time interval of determining described portable terminal during, reduce the decision threshold that portable terminal in the absolute thresholding switches to Target cell greater than the 4th thresholding;
Perhaps the signal transmission parameters value when described portable terminal is: during the neighbor cell signal loss of portable terminal/propagation delay, described adjustment decision threshold module is used for:
At the decline variable quantity of signal transmission attenuation/propagation delay in second time interval of the neighbor cell of determining described portable terminal during, improve the decision threshold that portable terminal in the absolute thresholding switches to the loss/propagation delay of Target cell greater than the 3rd thresholding; Or
In the decline pace of change of neighbor cell signal loss/propagation delay in second time interval of determining described portable terminal during, improve the decision threshold that portable terminal in the absolute thresholding switches to the loss/propagation delay of Target cell greater than the 4th thresholding.
15, the switched system in a kind of mobile radio system is characterized in that, comprising:
Measuring-signal transmission parameter module: obtain the signal transmission parameters value of portable terminal, and it is reported to adjustment decision threshold module and judgement and handover module;
Adjust the decision threshold module: when the signal transmission parameters value of determining the portable terminal that measuring-signal transmission parameter module reports satisfies predetermined condition, dynamically adjust the switch decision thresholding; Described switch decision thresholding comprises: switch relative threshold;
Judgement and handover module: the switch decision and the handoff procedure that carry out portable terminal according to the switch decision thresholding of described adjustment decision threshold module adjustment, signal transmission parameters value that measuring-signal transmission parameter module reports;
When the signal transmission parameters value of described portable terminal is: when the former Serving cell of portable terminal and the signal transmission quality of neighbor cell/signal receiving strength, described adjustment decision threshold module is used for:
During less than the 5th thresholding, improve the switching relative threshold in the rising variable quantity sum of neighbor cell signal transmission quality/signal receiving strength in the 3rd time interval of the decline variable quantity of former Serving cell signal transmission quality/signal receiving strength of determining portable terminal in the 3rd time interval and portable terminal;
Perhaps the signal transmission parameters value when described portable terminal is: when the former Serving cell of portable terminal and the signal transmission attenuation of neighbor cell/propagation delay, described adjustment decision threshold module is used for:
During less than the 5th thresholding, improve the switching relative threshold in the decline variable quantity sum of neighbor cell signal loss/propagation delay in the 3rd time interval of the rising variable quantity of former Serving cell signal transmission attenuation/propagation delay of determining portable terminal in the 3rd time interval and portable terminal.
16, the switched system in a kind of mobile radio system is characterized in that, comprising:
Measuring-signal transmission parameter module: obtain the signal transmission parameters value of portable terminal, and it is reported to adjustment decision threshold module and judgement and handover module;
Adjust the decision threshold module: when the signal transmission parameters value of determining the portable terminal that measuring-signal transmission parameter module reports satisfies predetermined condition, dynamically adjust the switch decision thresholding; Described switch decision thresholding comprises: switch relative threshold;
Judgement and handover module: the switch decision and the handoff procedure that carry out portable terminal according to the switch decision thresholding of described adjustment decision threshold module adjustment, signal transmission parameters value that measuring-signal transmission parameter module reports;
When the signal transmission parameters value of described portable terminal is: when the former Serving cell of portable terminal and the signal transmission quality of neighbor cell/signal receiving strength, described adjustment decision threshold module is used for:
During greater than the 5th thresholding, reduce the switching relative threshold in the rising variable quantity sum of neighbor cell signal transmission quality/signal receiving strength in the 5th time interval of the decline variable quantity of former Serving cell signal transmission quality/signal receiving strength of determining portable terminal in the 5th time interval and portable terminal;
Perhaps the signal transmission parameters value when described portable terminal is: when the former Serving cell of portable terminal and the signal transmission attenuation of neighbor cell/propagation delay, described adjustment decision threshold module is used for:
During greater than the 5th thresholding, reduce the switching relative threshold in the decline variable quantity sum of neighbor cell signal loss/propagation delay in the 5th time interval of the rising variable quantity of former Serving cell signal transmission attenuation/propagation delay of determining portable terminal in the 5th time interval and portable terminal.
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| CNB2005100815376A CN100486352C (en) | 2005-06-27 | 2005-06-27 | Switching method in wireless mobile communication system and system |
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| CNB2005100815376A CN100486352C (en) | 2005-06-27 | 2005-06-27 | Switching method in wireless mobile communication system and system |
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| CN100486352C true CN100486352C (en) | 2009-05-06 |
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| CNB2005100815376A Expired - Fee Related CN100486352C (en) | 2005-06-27 | 2005-06-27 | Switching method in wireless mobile communication system and system |
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Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2083587A1 (en) | 2008-01-25 | 2009-07-29 | British Telecommunications public limited company | Handover control |
| EP2232921B1 (en) * | 2008-01-25 | 2012-07-25 | BRITISH TELECOMMUNICATIONS public limited company | Handover control |
| CN101527943B (en) * | 2008-03-04 | 2010-12-08 | 中兴通讯股份有限公司 | Switching judgment method for microwave access global intercommunication system |
| CN101873657B (en) * | 2009-04-23 | 2014-12-10 | 中兴通讯股份有限公司 | Method for estimating quality of uplink signal in neighboring area and switching and optimizing method |
| CN102271336B (en) * | 2010-06-04 | 2014-06-11 | 中兴通讯股份有限公司 | System and method for semi-statically configuring uplink and downlink proportion |
| US9357464B2 (en) | 2010-07-31 | 2016-05-31 | Huawei Technologies Co., Ltd. | Arrangement and method for optimising handling of handovers in telecommunication systems |
| WO2013134955A1 (en) * | 2012-03-16 | 2013-09-19 | 富士通株式会社 | Handoff failure type determination method and device thereof |
| CN104113852B (en) * | 2013-04-17 | 2018-01-12 | 华为技术有限公司 | Cell measuring method and equipment |
| CN104836878A (en) * | 2015-05-20 | 2015-08-12 | 三星电子（中国）研发中心 | Method, device and system for outputting prompt in communication process |
| CN104902527A (en) * | 2015-06-29 | 2015-09-09 | 小米科技有限责任公司 | Communication network switching method and communication network switching device |
| US20180352492A1 (en) * | 2015-10-29 | 2018-12-06 | Huawei Technologies Co., Ltd. | Cell signal strength prediction method, cell signal strength reporting method, and user equipment |
| CN105848233A (en) * | 2016-03-24 | 2016-08-10 | 广东欧珀移动通信有限公司 | Switching method and switching device for communication networks |
| CN106034336B (en) * | 2016-05-20 | 2019-07-30 | 努比亚技术有限公司 | A kind of information processing method and mobile terminal |
| CN108632875A (en) * | 2017-03-22 | 2018-10-09 | 北京展讯高科通信技术有限公司 | Cell switching method, device and user equipment |
| CN113810966A (en) * | 2021-09-07 | 2021-12-17 | 维沃移动通信有限公司 | Cell switching method and device |
| CN113872709B (en) * | 2021-10-14 | 2023-10-24 | 上海橙科微电子科技有限公司 | System for continuously monitoring presence or absence of high-speed signal |
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