CN100527728C - Method for adjusting parameters of controlling reversed load in CDMA data system - Google Patents
Method for adjusting parameters of controlling reversed load in CDMA data system Download PDFInfo
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- CN100527728C CN100527728C CNB2004101025464A CN200410102546A CN100527728C CN 100527728 C CN100527728 C CN 100527728C CN B2004101025464 A CNB2004101025464 A CN B2004101025464A CN 200410102546 A CN200410102546 A CN 200410102546A CN 100527728 C CN100527728 C CN 100527728C
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Abstract
The method for use in increasing backward throughput includes following steps: monitors backward data traffic of accessing network; estimate the variation of the backward data traffic, and adjusts the transition probability of the speed rate; for example: when the backward data traffic falls down, increases or keeps transition probability of speed rate of speeding up, and meanwhile decreases the transition probability of speed rate of speeding down; in reverse, decreases or keeps the transition probability of speed rate of speeding up, and increases the transition probability of speed rate of speeding down. The method also includes: simultaneously adjusts the limitation for the highest backward speed rate and sends it to terminals.
Description
Technical field
The present invention relates to moving communicating field, the method for adjustment of a kind of DO (CDMA EVolution to packetData Optimized, CDMA data system) system reverse load Control Parameter is provided especially.
Background technology
In the DO system, Access Network (AN:Access Network) does not determine the speed of single reverse user link, and employing is the self-adaptive controlled making mechanism of terminal (AT:Access Terminal), terminal is adjusted speed according to the parameters of controlling reversed load that initial configuration and Access Network issue step by step in 9.6kbps, 19.2kbps, 38.4kbps, 76.8kbps, five grades of 153.6kbps.Parameters of controlling reversed load comprises parameters such as reverse flank speed restriction, rate transitions probability and the indication of RA bit.The detailed process that terminal is carried out adaptive control speed is: when Access Network inserts at terminal initial, the reverse flank speed restriction and the transition probability of configurating terminal, and always according to current reverse load situation, decision RA bit is set, continue to be broadcast to terminal, the RA bit is designated as the indication of Access Network overload, whether transship to portable terminal indication reverse link, if reverse link surpasses the predetermined threshold overload, then the RA bit is changed to 1, at this moment, portable terminal will reduce the data rate of reverse link transmission or keep speed constant according to the random number of fundamental test.Otherwise the RA bit is changed to 0, and portable terminal will increase the data rate of reverse link transmission or keep speed constant according to the random number of fundamental test.Wherein, the judgement whether Access Network transships is the threshold value whether ROT that measures Access Network (Rise Over Thermal, the end make an uproar lifting) surpasses default, if surpass, then is judged as overload.
Before terminal is adjusted speed automatically, need determine the maximum rate that allows from table one, table one is handed down to terminal by Access Network, below the parameter that relates in the his-and-hers watches one describe:
MaxRate: terminal is selected permission speed from table one;
CurrentRate: the present rate of terminal;
CombinedBusyBit: mix the RA indication, if terminal is in soft changing state, need RA indication associating with all sectors, judge whether overload, if a last Reverse Activity bit from the arbitrary sector of Active Set that accesses terminal that receives is ' 1 ', then accessing terminal CombinedBusyBit is set is ' 1 '.Otherwise accessing terminal CombinedBusyBit is set is ' 0 ', accesses terminal to upgrade the CombinedBusyBit value according to all RA indications that receive;
CurrentRateLimit: the current maximum rate restriction of Access Network; Terminal is initially set to 9.6kbps when inserting, Access Network is by broadcasting reverse rate restriction (BroadcastReverseRateLimit) message or single reverse rate restriction (UnicastReverseRateLimit) information updating, comprise RateLimit information in the described message, access terminal and upgrade the CurrentRateLimit value according to following principle:
1, if after the RateLimt value in the message smaller or equal to the CurrentRateLimt value, then receives this message, accessing terminal is provided with the CurrentRateLimit RateLimit value in the message for this reason;
2, if the RateLimt value in the message greater than the CurrentRateLimt value, a frame (16 time slot) after this message of reception then, accessing terminal is provided with the CurrentRateLimit RateLimit value in the message for this reason;
Transition probabilities: the rate transitions probability, system sends RateParameters (rate parameter) attribute notice terminal by parameter-negotiation procedure.Rate parameter is a consultation parameter, by system's decision parameter value, consults to be handed down to terminal by initial message.Transition probability is a series of values, be the probable value of each speed to adjacent rate transitions, comprise: Transition009k6_019k2, Transition019k2_038k4, Transition038k4_076k8, Transition076k8_153k6, Transition019k2_009k6, Transition038k4_019k2, Transition0076k8_38k4, Transition153k6_076k8.
Terminal based on present transmission rate, CombinedBusyBit value and a random number, is selected MaxRate in Table 1 when reverse transfer.Conditional outcome has true and false two kinds of situations, 0 and 1 the equally distributed basic experiment random number x and the transition probability that produce by accessing terminal are relatively determined, do not wait condition if satisfy in the table one, then expression condition is true, the MaxRate value of selecting that accesses terminal is the MaxRateTrue value of corresponding row in the table one, otherwise condition is false, and the MaxRate value of selecting that accesses terminal is the MaxRateFalse value of corresponding row in the table one.The present rate 19.2k of terminal for example, when the CombinedBusyBit of RA is designated as overload simultaneously, produce random number and current with rate transitions probability Transition019k2_009k6 comparison, if random number is less than Transition019k2_009k6, arrive 9.6k with regard to changing down, otherwise just keep former speed 19.2k.In Table 1, N/A represents not this option, and when terminal present rate restriction and CombinedBusyBit were " 0 " or " 1 ", initial condition setting terminal speed was 9.6kbps; Present rate is restricted to highest ranking speed 153.6kbps, and CombinedBusyBit is when being " 0 ", and terminal keeps this flank speed constant; Present rate restriction 9.6kbps, and CombinedBusyBit is when be " 1 ", the 9.6kbps speed of maintenance terminal.
Table one:
| CurrentRate | Combined BusyBit | Condition | MaxRateTrue | MaxRateFalse |
| 0 | ‘0’ | Very | 9.6kbps | N/A |
| 9.6kbps | ‘0’ | x<Transition009k6_019k2 | 19.2kbps | 9.6kbps |
| 19.2kbps | ‘0’ | x<Transition019k2_038k4 | 38.4kps | 19.2kbps |
| 384kbps | ‘0’ | x<Transition038k4_076k8 | 76.8kbps | 38.4kbps |
| 76.8kbps | ‘0’ | x<Transition076k8_153k6 | 153.6kbps | 76.8kbps |
| 153.6kbps | ‘0’ | False | N/A | 153.6kbps |
| 0 | ‘1’ | False | N/A | 9.6kbps |
| 9.6kbps | ‘1’ | False | N/A | 9.6kbps |
| 19.2kbps | ‘1’ | x<Transition019k2_009k6 | 9.6kbps | 19.2kbps |
| 38.4kbps | ‘1’ | x<Transition038k4_019k2 | 19.2kbps | 38.4kbps |
| 76.8kbps | ‘1’ | x<Transition076k8_038k4 | 38.4kbps | 76.8kbps |
| 153.6kbps | ‘1’ | x<Transition153k6_076k8 | 76.8kbps | 153.6kbps |
Simultaneously, access terminal not to be higher than the agreement defined, the peak data rate transmission that the available transmission power shown in the table two can provide, and, access terminal and do not select the minimum load length of regulation in the table two will send the data rate of size of data greater than it.
Table two:
| Transmission rate (kbps) | Minimum load (bit) | Peak load (bit) |
| 0.0 | 0 | 0 |
| 9.6 | 1 | 232 |
| 19.2 | 233 | 488 |
| 38.4 | 489 | 1000 |
| 76.8 | 1001 | 2024 |
| 153.6 | 2025 | 4072 |
Access terminal by above selection course the final transmission rate of selecting to satisfy following condition restriction:
Access terminal not to be higher than the speed rates of MaxRate value;
Access terminal not to be higher than the speed rates of CurrentRateLimit;
Access terminal not to be higher than the peak data rate transmission that available transmission power can provide;
Access terminal and do not select the minimum load length of regulation in the table two will send the data rate of size of data greater than it.
What at present, the reverse flank speed restriction in the table one was adopted is fixed form or excited user number deciding means.Fixed form is exactly: the fixing customer reverse load parameter of setting of Access Network, and when for example planning, fix maximum rate and just no longer adjust, do not change with environment and time, this mode good stability, but too conservative.
The excited user number deciding means is: according to excited users quantity in the Access Network, and decision customer reverse load parameter, for example: if having less than 2 excited users, maximum rate is exactly 153.6, and 2-4, maximum rate 76.8,5-8, maximum rate 38.4.Surpass 8, maximum rate 19.2.Like this, no matter whether the user has data to pass, maximum rate all is restricted.Because the difference of user behavior, this method can not really reflect reverse wireless environment.
Though realize that these two kinds of methods of the prior art are comparatively simple, the stability of Access Network is also better, but, this dual mode all is only to adjust the maximum rate limiting parameter, and the set point of maximum rate restriction is too mechanical stiff, can not be fit to different condition, varying environment is effectively utilized the requirement of reversing ability.And excited user number can not directly reflect current wireless environment actual conditions, and the parameter that is adopted also can't adapt to the adjustment requirement of different situations.
Summary of the invention
The invention provides and a kind ofly dynamically adjust the method for parameters of controlling reversed load according to the current reverse data transmission quantity of Access Network situation of change, to improve the reverse throughput of Access Network, described method realizes through the following steps:
Monitoring reverse data transmission quantity;
When described reverse data transmission quantity reduces, improve or keep the rate transitions probability of speedup, the rate transitions probability that reduction is slowed down, otherwise, when described reverse data transmission quantity improves, the rate transitions probability that reduces or keep rate transitions probability, the raising of speedup or keep slowing down;
Issue adjusted rate transitions probability to terminal.
Described method also comprises: when described reverse data transmission quantity reduces, improves or keeps reverse flank speed restriction, otherwise, reduce or keep reverse flank speed restriction; And, issue adjusted reverse flank speed restriction to terminal.
Described method also comprises: set the parameters of controlling reversed load adjustment cycle, and periodically monitor the reverse data transmission quantity and change reverse flank speed restriction of adjustment and/or rate transitions probability according to it.
Described method is by following method but be not limited to one of following method or combination in any monitoring reverse data transmission quantity: measure the end make an uproar lifting value, statistics overload indication ratio or with reference to current reverse flank speed restriction.
Further, adjust for convenient, can set the make an uproar different threshold values of one of lifting value, overload indication ratio or the restriction of current reverse flank speed or combination in any of the described end, the reverse data transmission quantity is divided into different conditions from high to low, for example heavy load state, middle load condition and three states of light load state; And set reverse flank speed restriction and rate transitions probability under the different reverse load states respectively; Like this,, select to be handed down to terminal to judge the reverse load state by monitoring reverse data transmission quantity with corresponding oppositely flank speed restriction of described reverse load state and/or rate transitions probability.
The method of the invention has solved the limitation that existing parameters of controlling reversed load is adjusted, and has improved the reverse throughput of Access Network, has kept the stability of Access Network simultaneously.
Description of drawings
Fig. 1 is the flow chart of the method for the invention.
Embodiment
Test shows, under the different reverse loads, different transition probabilities are to throughput, and promptly the reverse data transmission quantity has certain influence, according to the system loading situation, adjusts the rate transitions probability for increasing the Access Network capacity, and it is significant to keep Access Network stability.When the customer reverse data volume is big, need the every user rate of restriction at reduced levels, to improve access customer number, satisfy the basic demand of universal service.When the customer reverse data volume more after a little while, the user that can allow needs is transmitted under higher rate, improves Access Network capacity and user impression.
By the foundation of monitoring reverse data transmission quantity as the judgement load condition, if the reverse data transmission quantity is less, show that the reverse load state is lighter, can improve reverse flank speed restriction, and the transition probability of raising speedup, reduce the transition probability that slows down, allow the terminal reverse rate promote as much as possible, thereby reach higher reverse utilance, improve reverse throughput.More as the reverse data transmission quantity, show that reverse load is heavier, can oppositely regulate reverse flank speed restriction and rate transitions probability to keep the stability of system.
At first, determine that a group system parameter is in order to monitoring reverse data transmission quantity, what and the end make an uproar lifting value, parameter correlations such as overload indication ratio and present rate restriction of general data transmission quantity, can be used as the parameter of judging load condition, other parameters comprise excited user number, equivalent user number etc. also all can be used as basis for estimation, changes by monitoring parameter, judges that Control Parameter is dynamically adjusted in the variation of system reverse load.
Again according to the make an uproar empirical value of lifting value, three parameters of overload indication ratio and present rate restriction of the end, the reverse load state of system is extremely hanged down different conditions from height, set reverse flank speed restriction and rate transitions probability under the different conditions simultaneously, the basic principle of setting reverse flank speed restriction and rate transitions probability is:
1, when the reverse data transmission quantity reduces, improves or keeps the rate transitions probability of speedup, the rate transitions probability that reduction is slowed down; Otherwise, the rate transitions probability that reduces or keep rate transitions probability, the raising of speedup or keep slowing down;
2, when described reverse data transmission quantity reduces, improve or keep reverse flank speed restriction, otherwise, reduce or keep reverse flank speed restriction.
Wherein, overload indication ratio is a statistic, be the percentage that the interior overload indication of certain hour accounts for total duration, after the lifting threshold value is made an uproar at the setting end, if reverse load is greater than this threshold value, the overload indication appears in system, terminal is just answered changing down, to reduce the Access Network load, loads when being reduced to less than threshold value, overload indication cancellation, terminal should improve speed.
For easy to adjust, usual practice with the reverse load state of system from height to low be divided into heavy load, load and light load three classes, concrete differentiation threshold value can be with reference to shown in table three and the table four, and the parameters of controlling reversed load value of setting at different conditions is shown in table five, table six and table seven.The step of specifically adjusting parameters of controlling reversed load according to above setting is as shown in Figure 1:
Step S1: monitoring reverse data transmission quantity;
According to the monitoring parameter of above-mentioned setting, specifically measure the end make an uproar lifting value, statistics overload indication ratio, and the restriction of the present rate of comprehensive incoming end, the reverse data transmission quantity of Access Network is monitored.
Step S2: judge the reverse load state according to table three, table four;
Table three: heavy load state
| The present rate restriction | Reverse load (end make an uproar lifting) average | Overload indication ratio |
| 384k | >6dB | >60％ |
| 76.8k | >7dB | >50％ |
| 153.6k | >7.5dB | >45％ |
| ... | ... | ... |
Table four: light load state
| The present rate restriction | Reverse load (end make an uproar lifting) average | Overload indication ratio |
| 38.4k | <3dB | <40％ |
| 76.8k | <5dB | <30％ |
| 153.6k | <5.5dB | <25％ |
| ... | ... | ... |
When light, when heavy load does not all satisfy, system mode is set at middle load.
Step S3: according to the reverse load state, reverse flank speed restriction and/or the rate transitions probability set in option table five, table six and the table seven;
Table five: reverse flank speed restriction and rate transitions probability under heavy load:
| Transition?Probability | Setting |
| Transition009k6_019k2 | 32/255 |
| Transition019k2_038k4 | 8/255 |
| Transition038k4_076k8 | 8/255 |
| Transition076k8_153k6 | 8/255 |
| Transition019k2_009k6 | 32/255 |
| Transition038k4_019k2 | 32/255 |
| Transition076k8_038k4 | 64/255 |
| Transition153k6_076k8 | 1 |
| Reverse?rate?Limit | 38.4 |
Table six: reverse flank speed restriction and rate transitions probability under the middle load:
| Transition?Probability | Setting |
| Transition009k6_019k2 | 48/255 |
| Transition019k2_038k4 | 16/255 |
| Transition038k4_076k8 | 8/255 |
| Transition076k8_153k6 | 8/255 |
| Transition019k2_009k6 | 16/255 |
| Transition038k4_019k2 | 16/255 |
| Transition076k8_038k4 | 32/255 |
| Transition153k6_076k8 | 1 |
| Reverse?rate?Limit | 76.8 |
Table seven: reverse flank speed restriction and rate transitions probability under the light load:
| Transition009k6_019k2 | 64/255 |
| Transition019k2_038k4 | 32/255 |
| Transition038k4_076k8 | 16/255 |
| Transition076k8_153k6 | 8/255 |
| Transition019k2_009k6 | 8/255 |
| Transition038k4_019k2 | 8/255 |
| Transition076k8_038k4 | 16/255 |
| Transition153k6_076k8 | 1 |
| Reverse?rate?Limit | 153.6 |
Parameter in above-mentioned three tables also is rule of thumb to be worth setting, can be according to the adjustment of concrete system.
Step S4: selected new reverse flank speed restriction and/or rate transitions probability are handed down to terminal;
After having selected parameter, new reverse flank speed restriction is handed down to terminal by broadcasting reverse rate restriction of message or single reverse rate restriction of message.By parameter negotiation, with rate transitions probability through-rate parameter attribute notice terminal.Reverse flank speed restriction and rate transitions probable value that the terminal updating form is one li like this, when load is light, have improved the probability that terminal shifts to two-forty.
According to above-mentioned steps, can set the parameters of controlling reversed load adjustment cycle, parameters of controlling reversed load is carried out periodicity adjustment, and adjustment cycle can be set at the arbitrary value in 5～60 minutes, also can monitor the reverse data transmission quantity in real time and in time adjust parameters of controlling reversed load.
Use the method for the invention, can dynamically adjust reverse flank speed restriction and transition probability according to the concrete load condition of system, improved the stability of a system, simultaneously, during the free time, provide higher reverse flank speed restriction in system, improved the utilance of system, improve reverse coverage effect, avoided disturbing the covering that causes to shrink the covering cavity that causes.
Claims (8)
1, a kind of method of adjustment of parameters of controlling reversed load in CDMA data system is characterized in that, comprises the following steps:
A: monitoring reverse data transmission quantity;
B: when described reverse data transmission quantity reduces, improve or keep the rate transitions probability of speedup, the rate transitions probability that reduction is slowed down, otherwise, when described reverse data transmission quantity improves, the rate transitions probability that reduces or keep rate transitions probability, the raising of speedup or keep slowing down;
C: issue adjusted rate transitions probability to terminal.
2, the method for adjustment of Control Parameter as claimed in claim 1 is characterized in that:
Step B further comprises: when described reverse data transmission quantity reduces, improves or keeps reverse flank speed restriction, otherwise, reduce or keep reverse flank speed restriction; And,
Step C further comprises: issue adjusted reverse flank speed restriction to terminal.
3, the method for adjustment of Control Parameter as claimed in claim 1 or 2 is characterized in that also comprising: periodically monitor the reverse data transmission quantity and change reverse flank speed restriction of adjustment and/or rate transitions probability according to it.
4, the method for adjustment of Control Parameter as claimed in claim 3 is characterized in that: by measuring the end make an uproar lifting value, statistics overload indication ratio and monitor the reverse data transmission quantity with reference to current reverse flank speed restriction thrin or combination in any.
5, the method for adjustment of Control Parameter as claimed in claim 4 is characterized in that, also comprises the following steps:
Set the make an uproar threshold value of thrin in lifting value, overload indication ratio and the restriction of current reverse flank speed or combination in any of the described end, the reverse data transmission quantity is divided into different conditions;
Set reverse flank speed restriction and rate transitions probability under the different reverse load states;
Periodically monitor the reverse data transmission quantity to judge the reverse load state, select to be handed down to terminal with corresponding oppositely flank speed restriction of described reverse load state and/or rate transitions probability.
6, the method for adjustment of Control Parameter as claimed in claim 2 is characterized in that, described reverse flank speed restricted passage broadcasting reverse rate restriction of message or single reverse rate restriction of message are handed down to terminal.
7, the method for adjustment of Control Parameter as claimed in claim 1 is characterized in that, also comprises the adjustment grade of setting the rate transitions probability and adjusts according to setting step by step.
8, the method for adjustment of Control Parameter as claimed in claim 1 is characterized in that, described rate transitions probability through-rate parameter attribute notice terminal.
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| CN103442393A (en) * | 2013-09-06 | 2013-12-11 | 美商威睿电通公司 | Device and method for prolonging dormancy period of internet of things device |
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| cdma2000 1xEV-DO无线互联网接入系统的数据吞吐量研究及软件实现. 罗夙.中国优秀博硕士学位论文全文数据库. 2004 * |
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