CN1394020A - Speed control method by dynamic regulation of threshold for CDMA system - Google Patents
Speed control method by dynamic regulation of threshold for CDMA system Download PDFInfo
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Abstract
The invention discloses the method for controlling the rate by adjusting the dynamic threshold. The control method includes the rate control program and the program of dynamic adjusting the threshold. In the rate adjustment program, the comparisons between the transmitting powers at the mobile station as well as base station and their thresholds of the transmitting powers are selected as the references for dynamic adjusting the thresholds. In the program of dynamic adjusting the threshold, the load of the subzone is selected as the references of dynamic adjusting the transmitting powers. The total interference and transmitting power at the base station are selected respectively as the measuring indicators of the subzone load for upward and down ward transmissions. The threshold is property reduced, if the load on the air is heavy.
Description
The present invention relates to wireless communication system, refer in particular to the cdma cellular mobile communication, is according to cell load, and quality of service and wave point communication environments are dynamically adjusted the correlation technique of service rate.
CDMA is a kind of modulation and multiple access interconnection technique based on spread spectrum communication.Spread spectrum technic is to multiply each other with high speed pseudo noise code and digital signal at signal sending end, because the speed of the speed ratio digital signal of pseudo noise code is much bigger, thereby has expanded the signal transmission bandwidth.At receiving terminal, multiply each other with identical pseudo random sequence and received signal, carry out related operation, with the spread-spectrum signal despreading.Because at cdma system, between the pseudo noise code complete quadrature, this causes having the phase mutual interference between the different channels and different user in the sub-district.In order to prevent this self-interference phenomenon, adopt uplink and downlink usually, use inner-loop power control and external circule power control method simultaneously.
When system's propagation conditions changes, increase as disturbing on the air interface, perhaps the user is distant from the base station, when path loss increases, reach certain signal to noise ratio, transmitting power is then needed to increase in order to make receiving end signal, but the increase of transmitting power can increase the interference on the air interface again, interference on the air interface is big more, can make transmitting power increase again, so forms the positive feedback of a power ramp.After system load reached certain degree, this positive feedback made the transmitting power of travelling carriage and base station increase very soon, thereby the whole system load may level off to saturation condition rapidly.
Thus, system just is necessary to take measures, and increases a negative feedback control mechanisms and reduces system emission power, with the soaring positive feedback phenomenon of compensation power.The conventional method that addresses this problem is that some transmitting power thresholdings are set, and then according to the comparison of transmitting power and each thresholding, takes corresponding speed to adjust measure, with the soaring positive feedback of compensation power.For example surpass certain Upper threshold when transmitting power, it is heavy that the illustrative system load becomes, perhaps channel conditions deteriorate, and perhaps travelling carriage is far away from the base station, in this case, can reduce channel emission power by reducing service rate, and then reduce system load.Otherwise when being lower than certain Lower Threshold when transmitting power, the illustrative system load lightens, and perhaps channel condition improves, and perhaps travelling carriage is nearer from the base station, at this moment, can suitably improve service rate, to improve professional QoS.
An other reason of adjusting service rate is the have different adaptive capacity of each service rate to the communication environments change.When cell load increases or channel conditions deteriorate, the user that the high user of service rate and service rate are low compares, and its service quality tends to reduce sooner than the latter.This situation can be illustrated by the exemplary of AMR speech business.Provided the curve of the voice quality MOS score value of every kind of AMR rate mode among Fig. 1 with the C/I variation.By among the figure as can be known, when C/I diminished, the MOS score value of the AMR pattern that speed is high reduced to such an extent that the rate of change of the low AMR pattern of specific speed wants fast with the variation of C/I.Cause like this under the situation of sub-district communication environments variation, the quality of low rate traffic is higher relatively on the contrary than the quality of high-rate service.If at this moment, still keep original two-forty, can make the customer service quality reduce rapidly.If during this time turn down user's service transmission rate, can make that then quality of service improves relatively.
When cell load is light, above just the opposite under the situation of change of high rate user and low-rate users service quality and the heavier situation of cell load.Though, under the heavier situation of cell load, changing down in the certain limit, but slow down underspeeding of QoS (quality of service), thus QoS is remained in certain scope.But QoS of survice has reduced on the whole after all.Therefore, when system resource allows, promote service rate, can improve quality of service, thus we should be as far as possible with the speed rates voice-and-data of maximum.Promptly when the system load step-down, need increase data rate, so that better QoS to be provided with proper step.At this moment, with the same reason of the preceding paragraph, the judgement parameter that we still can use channel emission power to increase as speed.
As from the foregoing, carry out the foundation of speed when adjusting and be whether transmitting power surpasses or be lower than thresholding.Generally speaking, in order to guarantee the fairness to the user, the setting of these transmitting power thresholdings is fixed, promptly beginning according to cell load, channel condition quality and travelling carriage are provided with thresholding from a statistics of base station distance, and in the process afterwards, these thresholdings are not changing.Yet can there be certain problem in fixing transmitting power thresholding.Such as, when system load is very heavy, if the transmitting power thresholding is the same high in the time of very light with system load, then to the increase of transmitting power, system may be difficult to detect apace, thereby can cause system slow in reacting, the danger that causes system crash is so just arranged the positive feedback power ramp phenomenon of transmitting power and system load.
On the contrary, when system load is low weight, it is the same low when if each transmitting power threshold setting must be heavier with system load, in case then service rate has increase slightly, then system will make the decision that reduces service rate, even under the enough sufficient situation of system resource, each business also has no idea these channel resources are made full use of, thereby reduces the efficient of system and the QoS that can not guarantee the high-rate service transfer of data.
What the present invention is directed to that problem that prior art exists proposes comes the method for rate control of dynamic adjusted threshold then can solve the problem that top fixed threshold algorithm causes well according to the cell load situation.It includes two parts, and first adjusts speed according to the relation of transmitting power and each threshold value, and second portion is according to the cell load situation each thresholding of transmitting power dynamically to be adjusted.
Wherein first according to transmitting power and threshold value relatively come service transmission rate is adjusted, thereby can alleviate cell load when load is approached to saturation, slow down quality of service variation speed and when load reduction, improve quality of service.Its basic thought is such: the controlling object of rate controller is professional a connection, controller comprises two parts function, the one, control essential feedback information for obtaining, mode and frequency that obtain information is provided with, realize by measuring control.Measure the Event triggered mode that adopts,, trigger measurement report when transmitting power surpasses threshold value.The 2nd, according to the measurement report feedback information that obtains, and controller state and speed governing timer state, carry out the speed adjustment and judge, and carry out rate adjustment process respectively.
Second portion is dynamically adjusted each threshold value of transmitting power, and its basic step is: up the total interference level in base station place is measured, descending the total transmitting power in place, base station is measured.When cell load is heavier, all professional each transmitting power thresholdings that connect are reduced a grade, two benefits are arranged like this, the one, make more responsive to the increase of any transmitting power, react faster, can be to the business of transmitting power increase, the rapider resolution that reduces service rate of making.The 2nd, on the whole all professional transmitting powers that connect have been reduced a grade, can reduce cell load quickly and effectively.In addition, when cell load is light, then all professional high grades of each transmitting power thresholding that connects, two benefits are so also arranged, the one, make more responsively to the attenuating of any transmitting power, react faster, in the time of like this can be to transmitting power attenuating professional, the rapider resolution that increases service rate of making is improved QoS of survice.The 2nd, on the whole all professional transmitting powers that connect have all been improved a grade, can under the light situation of load, increase utilization rate of channel resources effectively.
The objective of the invention is to adopt the method for rate control of dynamic threshold adjustment, be implemented in the situation that cell load is heavier or quality of service is lower, improve cell load situation and quality of service by the service rate adaptive control.Under the heavier situation of cell load, alleviate cell load quickly, under the lighter situation of cell load, satisfy professional Qos better.
It is to select for use transmitting power as the metric of weighing current connection state that concrete technology of the present invention constitutes, and uses the Event triggered mode that transmitting power and cell load are measured.Business is connected transmitting power, the up transmitting power of choosing travelling carriage, the descending sign indicating number transmitting power of choosing the place, base station, and to cell load, the up total interference level in place, base station of choosing, the descending total transmitting power in place, base station of choosing.The measurement of its transmitting power is in order measured value and transmitting power thresholding to be compared, when surmounting certain thresholding, then service rate to be turned down, when being lower than certain threshold value, then service rate being heightened.To the load measurement is in order it and cell load thresholding to be compared, when cell load is heavier, then the transmitting power threshold value of respective direction to be turned down, when cell load is light, then the transmitting power thresholding of respective direction being heightened.Rate control program of the present invention can be realized following function: after channel is set up or reshuffled and finishes, use to measure to be controlled to be channel setting transmitting power upper lower limit value; After channel emission power was crossed threshold value, physical layer sent the measurement event report; After receiving measurement report, rate controller carries out measurement report processing and rate controlled and judges according to measured value and/or event report type; According to judged result, send the rate controlled command/request to carry out rate controlled, if after carrying out the speed adjustment, surpass certain time, do not receive load state, the transmitting power measurement event report that send travelling carriage that the quality of connection change causes and base station is then sent timer and is exceeded event report.At this moment, last speed adjustment DeGrain is described, need carries out speed governing once more and handle.At this moment, rate controller continues to increase or changing down according to its pattern state of a control, if speed governing does not have effect once more, then will further increase or changing down, up to being increased to maximum rate or being reduced to minimum-rate.Therefore this process may comprise sending of rate controlled order for several times.
The dynamic adjusting module of transmitting power of the present invention is realized following function: after the sub-district is set up, use to measure to be controlled to be channel setting transmitting power threshold value up and down; After cell load was crossed upper threshold, physical layer sent the measurement event report; After receiving measurement report, rate controller carries out measurement report processing and rate controlled and judges according to measured value and/or event report type; According to judged result, send the rate controlled command/request to carry out rate controlled, if after carrying out the speed adjustment, surpass certain time, do not receive load state, the transmitting power measurement event report that send travelling carriage that the quality of connection change causes and base station, then sending timer exceeds event report and carries out according to the cell load situation, its basic thought is: at first the cell load situation is measured, up direction, measure the total interference level in place, base station, down direction is measured the total transmitting power in place, base station.When cell load is heavier, trigger the load measure Upper threshold, system reduces one-level to the transmitting power thresholding after receiving the heavy measurement report of load state change.When cell load is light, trigger the load measure Lower Threshold, system improves one-level to the transmitting power thresholding according to the load report value that receives.If in certain professional transmitting power thresholding adjustment process, change has taken place the correlation of its transmitting power and transmitting power thresholding, then can trigger the corresponding transmission power measurement report and give rate controller.Be lower than certain threshold value as, transmitting power originally, after the threshold value that causes owing to load is heavier is turned down, make current transmit power be higher than newly-installed transmitting power threshold value, then trigger the report of going up that transmitting power is crossed upper threshold.
For the detailed technology of the method for rate control that can explain dynamic adjusted threshold of the present invention constitutes, as follows below in conjunction with description of drawings:
Accompanying drawing 1: rate control program schematic flow sheet
Accompanying drawing 2: transmitting power is dynamically adjusted schematic flow sheet
Accompanying drawing 3: distributed rate control schematic diagram accompanying drawing 4 in the cellular system: event type and each threshold value in the Event triggered measurement report
Accompanying drawing 5: each AMR voice rate pattern voice quality MOS score value is with the change curve of C/I
Respectively the method for rate controlled module and the dynamic adjusting module of transmitting power thresholding is described in detail below, the detailed method of rate controlled module is as follows, can understand in conjunction with Fig. 1:
(1) at first carries out the dynamic adjusting module initialization of rate controlled module and transmitting power thresholding, wherein the rate controlled module initialization comprises that setting transmitting power measures 4 transmitting power thresholdings of control, the initialization of speed governing timer resets timer, and it is normality that the initialization of rate controller state is provided with controller state.The dynamic adjusting module of transmitting power thresholding comprises load measure control initialization, for up-downgoing totally 4 load-threshold values are set.
(2) if the up-downgoing transmit power variation triggers in 4 measurement event, as shown in Figure 2, transmitting power is passed through threshold_1 from the bottom up, during threshold_3, difference trigger event Eventl, Event3, transmitting power is passed threshold_2 from top to bottom, during threshold_4, difference trigger event Event2, Event4.After the Event triggered, produce measurement report, rate controller is received behind the measurement report according to its current state and is entered separately change speed flow process respectively.
(3) when rate controller is normal transmit status, then judge the measurement report event type, and carry out the speed adjustment: if event type is an incident 1 according to following step, then rate controller reduces by one with service rate, the transmission rate control command, start the reduction of speed timer simultaneously, rate controller changes low speed state over to; If event type is an incident 2, then rate controller increases by one with service rate, and the transmission rate control command starts the speedup timer simultaneously, and rate controller changes the speedup state over to; If event type is incident 3 and incident 4, then do not influence the rate controller state.
(4) be in the reduction of speed state of a control when rate controller, whether then first decision event type is reduction of speed timer expiry incident, if then rate controller reduces by 1 with speed once more, sends the rate controlled order, the reduction of speed timer resets.As speed has been minimum value, stops timer, but transmission rate control command not.If not reduction of speed timer expiry incident, then judge the measurement event type, adjust according to following step: if event type is an incident 1, then rate controller reduces by 1 with speed, and with this transmission rate control command, reduction of speed timer simultaneously resets.If speed has been minimum value, stop timer, but transmission rate control command not; If event type is an incident 2, rate controller stops the reduction of speed timer, and enters normality; If event type is an incident 3, close the reduction of speed timer, enter the speedup state; If event type is an incident 4, then speed is increased by 1, send the rate controlled order.Close the reduction of speed timer simultaneously, start the speedup timer, enter the speedup state.
(5) be the state of a control of advancing the speed when rate controller, whether then first decision event type is for the speedup timer exceeds incident, if then rate controller increases by 1 with speed once more, sends the rate controlled order, the speedup that resets timer.As speed has been maximum, stops timer, but transmission rate control command not.If not speedup timer expiry incident, then judge the measurement event type, adjust according to following step: if event type is an incident 1, then rate controller reduces by 1 with speed, and with this transmission rate control command, reduction of speed timer simultaneously resets.If speed has been minimum value, stop timer, but transmission rate control command not; If event type is an incident 2, close the speedup timer, enter low speed state.If event type is an incident 3, rate controller stops the speedup timer, and enters normality; If event type is an incident 4, then speed is increased by 1, send the rate controlled order.Close the reduction of speed timer simultaneously, start the speedup timer, enter the speedup state.
The detailed method that the transmitting power thresholding is dynamically adjusted is as follows, also can understand in conjunction with Fig. 2:
(1) cell load is measured the control initialization, comprises heavier Upper threshold and the lighter Lower Threshold of cell load in sign sub-district on the uplink and downlink direction is set respectively.
(2) place, the base station physical layer difference total interference level of periodic measurement uplink air interface and descending total transmitting power when measured value surmounts the upper threshold that cell load is heavier that shows that sets in advance, then trigger to measure and go up report.As being lower than the Xiamen limit value that cell load is lighter that shows that sets in advance, then triggering and measure report down when measured value.
(3) system correspondingly adjusts all professional transmitting power threshold values in the sub-district according to the measurement report type.Go up report if measure, then threshold value is suitably turned down one-level.If measure report down, then threshold value is heightened one-level.And according to the transmitting power adjustment court verdict of making, send and measure control, each professional transmitting power threshold value is upgraded.
(4) if after each professional transmitting power threshold value is adjusted, variation has taken place in the correlation of transmitting power that certain is professional and transmitting power threshold value, then triggers corresponding measurement report and carries out rate adjustment process.
(5) if before thresholding is adjusted, certain professional transmitting power measured value is lower than transmitting power thresholding 1 among the figure (2), and after thresholding is adjusted, and its transmitting power becomes and is higher than transmitting power thresholding 1, and then trigger event 1, produces corresponding measurement report.If after thresholding is adjusted, certain professional transmitting power measured value is higher than reflection power thresholding 3 among the figure (2), and after thresholding is adjusted, and its transmitting power becomes and is lower than transmitting power thresholding 3, and then trigger event 3, produce corresponding measurement report.Because thresholding adjustment and situation about changing with the correlation of thresholding, system does not produce measurement report to other transmitting power.
Cellular cell supposes that the base station is placed on center of housing estate as shown in Figure 3, even distribution several mobile stations in the sub-district.Wherein travelling carriage 1 inserts sub-district 1, and travelling carriage 2 is in macro diversity status, inserts sub-district 1 and sub-district 3 simultaneously, and travelling carriage 3 inserts sub-district 2, and travelling carriage 4,5 inserts sub-district 3.Each travelling carriage all requires the connection of having set up them according to QoS (quality of service) when inserting.The quality of every connection is by initial rate and the decision of its frame error rate.After connect setting up,, converge on the target signal to noise ratio at the signal to noise ratio of receiving terminal because the effect of power control makes every to connect the up-downgoing transmitting power after having overcome path loss and decline.
When carrying out rate controlled, travelling carriage 1,3,4 only need know it respectively and insert 1,2,3 relevant informations of setting up Radio Link in sub-district, 2 need of travelling carriage are known the relevant information that inserts a wireless links best in the sub-district 1 or 2.Specifically be exactly the transmitting power of travelling carriage and the sign indicating number transmitting power of this link of base station punishment dispensing.Load increases in the sub-district, and air interface interference increases, and required transmitting power increased when then every connection will make the reception signal to noise ratio reach the target signal to noise ratio.Transmitting power increases, and makes air interface interference increase conversely again, disturbs to increase to make the transmitting power of all connections increase again, thereby forms positive feedback, causes the transmitting power phenomenon that rises.For fear of this phenomenon, need add a negative feedback, the positive feedback of transmitting power is compensated, make the soaring phenomenon of transmitting power be inhibited.Method of rate control among the present invention can play the effect of negative feedback compensation.When cell load increases, cause transmitting power to increase when forming positive feedback, the corresponding transmitting power that connects of certain user can surpass the threshold value of regulation.Such as travelling carriage 1 transmitting power surpasses the threshold value 1 among Fig. 4, thereby trigger event 1 produces measurement report.Suppose that the present rate controller is in normal condition, then rate controller can reduce travelling carriage speed, and the transmission rate control command, starts the reduction of speed timer simultaneously, and rate controller then changes low speed state over to.Suppose and before the reduction of speed timer exceeds, do not receive other measurement event.Then timer exceeds and trigger event, produces measurement report.After rate controller receives measurement report, judge that earlier rate controller is in low speed state, so check the reduction of speed timer, discovery is that the reduction of speed timer exceeds, so rate controller reduces one-level again to speed, starts the reduction of speed timer once more.If reduction of speed does not also have effect once more, rate controller also can reduction of speed, up to dropping to minimum speed limit.By changing down, can make professional transmitting power diminish, form the negative feedback of transmitting power, thereby alleviate cell load, suppress the soaring phenomenon of transmitting power.
When cell load reduces, make the interference on the air interface reduce, thereby every the transmitting power that connect to need reduces, when load reduction to some degree, certain user's transmitting power is lower than the threshold value 4 of regulation, such as travelling carriage 4 transmit power variation trigger measurement event 4, then rate controller judge that earlier rate controller is in low speed state, and the reduction of speed timer does not exceed after receiving measurement report, then rate controller increases by 1 with speed earlier, sends the rate controlled order.Close the reduction of speed timer simultaneously, start the speedup timer, rate controller enters the speedup state.Pass through to increase service rate like this, can be so that the quality of service of travelling carriage 4 respective user be improved.
Contrast cellular cell shown in Figure 3 as can be known, the adjustment of Any user service rate is just at the sub-district of inserting, following of grand diversity is at best cell, and the speed adjustment between user and the user is separate, when making the speed adjustment and judging and carry out the speed adjustment, not directly related with other users all only at certain user.Thereby we are as can be seen at the advantage of this distributed rate control method that connects: the correlation that at first can reduce control, improve the fault-tolerant ability of whole system control, can be not influential during an i.e. user's control failure to other users, can not cause chain reaction when making failure.In addition, owing to carry out distributed control, the dispatching method of complexity makes whole algorithm simple when having avoided all signalings all to put processing together, is easy to realize and the reliability height.At last, by reducing the complexity of control, make algorithm realize the requirement of hardware resource is reduced, can save cost like this at the distributed rate control algorithm that connects.
We consider cellular system shown in Figure 3 equally, and after each sub-district was set up, cell load was measured the control initialization, and wherein threshold value is set to 0.75 times of power-carrying and 0.5 times of power-carrying respectively about the cell load.Certain the time, three sub-district internal burdens evenly distribute, and all are between 0.5 and 0.75 times of power-carrying.Travelling carriage in the sub-district is shifted to sub-district 1 gradually according to certain rule.Make the load of each sub-district that following variation take place.Place, 1 base station, sub-district detects the load Upper threshold that cell load surmounts 0.75 times of power-carrying, and place, 3 base stations, sub-district detects the load Lower Threshold that cell load is lower than 0.5 times of power-carrying.At this moment, according to load measure report separately, the transmitting power threshold value of each user of mobile station in the sub-district 1 is turned down one-level, and the transmitting power threshold value of each user of mobile station is raised one-level in the sub-district 3.
If at this moment, travelling carriage 4 and travelling carriage 1 are shifted to edge, sub-district separately, and be far and near the same from access base station separately, and all apply for two-forty PS territory business, and then system has different processing to both applications.To travelling carriage 1, if the service source rate requirement increases, because each professional transmitting power threshold value of sub-district 1 has reduced, so the transmitting power of travelling carriage is compared with the method for fixed transmission power thresholding, can more promptly surpass transmitting power Upper threshold 1, thereby system makes a response sooner and reduces the judgement of service rate, so that the transmitting power of travelling carriage 1 reduces, simultaneously, because each professional transmitting power has all reduced a rank in the whole sub-district, so cell load correspondingly reduces, and can alleviate the load of sub-district 1 so quickly, reduce the access rate of cutting off rate and increase sub-district 1.And to the travelling carriage in the sub-district 34, then the processing meeting of system is different fully.When 4 application high-rate services, because sub-district 3 loads are lighter, so each professional transmitting power thresholding has all improved a grade, so even travelling carriage uses high data rate, its transmitting power may can not trigger transmitting power Upper threshold 1 yet, thereby system can not reduce the speed of travelling carriage, has improved the QoS of travelling carriage 4 like this.Simultaneously, because each professional transmitting power thresholding has all improved a grade in the whole sub-district,, improved the utilance of free channel resource in the sub-district 3 so make under the lighter situation of sub-district 3 loads.
In sum, adopt method of rate control of the present invention, make CDMA mobile communication system when load is heavier, can improve quality of service simultaneously and suppress the power ramp phenomenon effectively, thereby the mitigation system load makes system keep stable.And can increase user's access rate and reduce cutting off rate.Owing to adopt up-downgoing speed is adjusted respectively, thereby made the up-downgoing adjustment asymmetricly to carry out.Make it possible to dispose the up-downgoing resource respectively according to the different demands of up-downgoing traffic carrying capacity.And since the information that speed is adjusted from measurement to transmitting power because there is power control, so the speed adjustment reflects cell load fast, the situation of change of quality of connection and communication environments.Thereby the situation to load overload and quality of service reduction is carried out Balance Treatment fast.When carrying out service rate when adjusting, the threshold value of transmitting power is made as 4, each threshold value trigger event is carried out different speed respectively adjust strategy, can carry out speed at loading level like this and accurately control.And carry out service rate when adjusting, and only increase or reduce one-level at every turn, make transmitting power and the cell load that is changed can not produce sudden change.Like this, the system that not only makes can operate steadily, and the business that yet makes the saltus step phenomenon can not occur, thereby can improve quality of service, and system is operated steadily.To once adjusting the situation of DeGrain, by the speed governing timer is set, thereby can repeatedly adjust speed, can guarantee the validity that speed is adjusted like this, promptly it reduces load effectively, guarantees the unfavorable variation of quality of service and compensation communication environments.In addition, under the heavier situation of cell load, make system more responsive, react faster the increase of any transmitting power, like this can be to the business of transmitting power increase, the rapider resolution that reduces service rate of making.And can reduce a grade to all professional transmitting powers that connect on the whole, can reduce cell load quickly and effectively like this.And when cell load was light, it was more responsive to the reduction of any transmitting power to make that system makes, reacted faster, like this can be to the business of transmitting power attenuating, and the rapider resolution that increases service rate of making is improved QoS of survice.In addition, can all improve a grade to all professional ground transmitting powers that connect on the whole, can increase utilization rate of channel resources effectively like this.
Claims (5)
1. method of rate control of dynamically adjusting the transmitting power thresholding, it is characterized in that this method is to be made of rate control program and dynamically adjustment program of thresholding, its rate control program comprises the steps to finish: at first the control initialization is measured in up-downgoing respectively, the rate controlled initialization, comprise the setting of 4 threshold values of up-downgoing, and the rate controlled module is set is normal state of a control; Physical layer is periodically measured the transmitting power that business connects, and to upstream rate control, measures at the travelling carriage place, to downstream rate control, measures and locates in the base station; If in 4 measurement event of the change triggers of transmitting power one then produces measurement report, rate controller is adjusted speed respectively according to the state of measurement report and rate controller; When rate controller is normal transmit status, then, respectively speed is adjusted according to the measurement report event type; When rate controller is the changing down state of a control, whether then first decision event type for the reduction of speed timer exceeds incident, if, do changing down rate processing again, if not reduction of speed timer expiry incident, then, speed is adjusted respectively according to the measurement event type; When rate controller is the speedup state of a control, whether then first decision event type is for the speedup timer exceeds incident, if do the processing of advancing the speed again; If not speedup timer expiry incident, then, respectively speed is adjusted according to the measurement event type; During upstream rate control, control command is issued the professional codec that connects in the corresponding travelling carriage; During downstream rate control, control command is issued the professional transcoder that connects in the corresponding core net;
Dynamically adjustment program of its thresholding comprises following steps: cell load is measured the control initialization, comprises Upper threshold and the lighter Lower Threshold of cell load that shows on the uplink and downlink direction that cell load is heavier is set respectively; Base station place physical layer is the total interference level of periodic measurement uplink air interface and descending total transmitting power respectively, when measured value surmount set in advance show the heavier upper threshold of cell load the time, trigger to measure and go up report; When measured value be lower than set in advance show the lighter Xiamen limit value of cell load the time, trigger and measure report down; System correspondingly adjusts all professional transmitting power threshold values in the sub-district according to the measurement report type; Go up report if measure, then threshold value is suitably turned down one-level; If measure report down, then threshold value is heightened one-level, and adjust court verdict according to the transmitting power of making, send and measure control, each professional transmitting power threshold value is upgraded; If before and after each professional transmitting power threshold value was adjusted, variation had taken place in the correlation of transmitting power that certain is professional and transmitting power threshold value, then judges whether to trigger corresponding measurement report to carry out rate adjustment process.
2. the method for rate control of a kind of dynamic adjustment transmitting power thresholding as claimed in claim 1, it is characterized in that: when rate controller is in the speedup state, when the speedup timer exceeded again, then rate controller increased by 1 with speed once more, send the rate controlled order, the speedup that resets timer; As speed has been maximum, stops timer, but transmission rate control command not.
3. the method for rate control of a kind of dynamic adjustment transmitting power thresholding as claimed in claim 1 is characterized in that: carry out upstream rate control, when transmission power of mobile station was measured, the object of measurement was professional a connection; When carrying out downstream rate control, measure for the transmitting power of a connection to base station assigns, the object of measurement is a professional wireless links that connects.
4. the method for rate control of a kind of dynamic adjustment transmitting power thresholding as claimed in claim 1 is characterized in that: when the speed adjustment was carried out in up-downgoing, the adjustment of speed was that classification is carried out, and turns down one-level at every turn; The classification processing and the discretization of speed are determined by traffic performance; Thereby obtain rate controlled scheme at different service types.
5. the method for rate control of a kind of dynamic adjustment transmitting power thresholding as claimed in claim 1, it is characterized in that: the pattern control command is at professional a connection, thereby all Radio Links to travelling carriage and base station are controlled, so method of rate control also is suitable for soft changing state.
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CNB011225246A CN1148911C (en) | 2001-06-27 | 2001-06-27 | Speed control method by dynamic regulation of threshold for CDMA system |
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