CN101562496B - System and method for controlling signal channel rate dynamic adjustment - Google Patents
System and method for controlling signal channel rate dynamic adjustment Download PDFInfo
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- CN101562496B CN101562496B CN2008100890648A CN200810089064A CN101562496B CN 101562496 B CN101562496 B CN 101562496B CN 2008100890648 A CN2008100890648 A CN 2008100890648A CN 200810089064 A CN200810089064 A CN 200810089064A CN 101562496 B CN101562496 B CN 101562496B
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Abstract
The invention discloses a system and a method for controlling the signal channel rate dynamic adjustment, which relate to a wireless high speed grouped data CDMA20001x EVDO system. The method comprises the following steps: counting the time slot proportion value occupied by a control channel in a control channel call back period in a certain time, judging if the proportion value is greater than the preset threshold, informing a system to choose the rate of 76.8kbit/s if yes or else to choose the rate of 38.4kbit/s. With the technical scheme and under the premise of ensuring certain error rate performance, the range of thresholds collocated correspondingly to different rate is set, thus compared with the current manual operation control, the dynamic adjustment of the control channel can be timely and accurately made.
Description
Technical field
The present invention relates to wireless high-speed packet data CDMA20001x EVDO system, particularly a kind of system and method for control channel rate dynamic adjustment.
Background technology
Present CDMA20001x EVDO forward channel with the time be divided into the master, sign indicating number is divided into auxilliary, wherein time division multiplexing between Traffic Channel and the control channel.Control channel is mainly used in the message that transmits broadcast or particular terminal, and it and Traffic Channel are shared same physical channel with time division way, and control channel or Traffic Channel are judged according to the channel logo MAC Index in the channel prefix in the terminal.Transmit the control channel packet, its channel architecture is identical with Traffic Channel, and control channel comprises 38.4kbit/s and two kinds of speed of 76.8kbit/s; As shown in table 1; 38.4kbit/s maximum timeslot number be 16, physical packet of data length is 1024, prefix length is 1024; And the maximum timeslot number of 76.8kbit/s is 8, and physical packet of data length is 1024, and prefix length is 512.
The control channel of table 1 different rates constitutes table
Wherein, the speed of 76.8kbit/s so throughput is big, but because the data of transmission of high-rate are high to the requirement of airlink, requires signal to noise ratio than higher, so coverage diminishes because to have adopted high-order modulating, symbol to carry information many; In like manner, the throughput of 38.4kbit/s speed is little, but the scope that covers is big.
And the target of CDMA20001x EVDO forward link optimization makes throughput of system maximize exactly, so how according to radio link quality and system resource condition adjustment packet transmission rate, just become the major issue that the throughput of system performance improvement is faced.At present the adjustment of control channel speed is still judged by system operation, manually chosen the speed of control information on the backstage, therefore, make the CDMA20001xEVDO system can not adjust selection speed timely and accurately.
Summary of the invention
The technical problem that the present invention will solve is a kind of system and method for control channel rate dynamic adjustment to be provided, thereby to adjust the speed of control channel timely and accurately.
In order to address the above problem; The invention provides a kind of method of control channel rate dynamic adjustment, in certain hour length, statistics control channel shared time slot ratio value in a control channel readjustment cycle; Judge that whether this ratio value is greater than the threshold value that is provided with in advance; If then reporting system is selected the speed of 76.8kbit/s for use, otherwise reporting system is selected the speed of 38.4kbit/s for use.
Further, in the said method, said threshold value scope is: 30% to 37.5%.
After wherein the said method reporting system is selected corresponding speed for use, empty the shared timeslot number of the control channel of being added up.
Said method carries out timing through a timer to said statistical operation.
The invention also discloses a kind of system of control channel rate dynamic adjustment, this system comprises statistical module connected to one another and rate controlled module, wherein
Said statistical module is used in certain hour length, and statistics and calculation control channel are adjusted back shared time slot ratio value of cycle at a control channel, and this ratio value is sent to said rate controlled module;
Said rate controlled module; Be used to judge the said control channel received a control channel readjustment shared time slot ratio value of cycle whether greater than the threshold value that is provided with in advance; If then reporting system is selected the speed of 76.8kbit/s for use, otherwise reporting system is selected the speed of 38.4kbit/s for use.
Further, the scope of threshold value described in the said system is: 30% to 37.5%.
Wherein, after said rate controlled module reporting system was selected corresponding speed for use, said statistical module emptied its control channel of adding up at a control channel readjustment shared timeslot number of cycle.
Said system comprises that also the statistics that links to each other with statistical module uses timer, and this timer is used for the statistical operation of said statistical module is carried out timing.
Technical scheme of the present invention is provided with different rates and disposes pairing threshold range under the prerequisite that guarantees certain error rate performance, therefore with respect to present manual operation control, more timely and accurately control channel speed is dynamically adjusted.
Description of drawings
Fig. 1 is the structural representation that the present invention realizes control channel speed Adjustment System;
Fig. 2 is the flow chart that system shown in Figure 1 realizes the adjustment of control channel speed.
Embodiment
Main design of the present invention is that control channel and Traffic Channel are shared same physical channel with time division way, when the shared timeslot number of Traffic Channel is many, need to improve transmission quality and efficient, so just can improve throughput; When the shared timeslot number of Traffic Channel is fewer, then need suitably reduce throughput, can improve coverage like this.
Specifically; When control channel speed is 38.4kbp/s, the most multiple 3 MAC bag in a control channel readjustment cycle, but generally all be controlled at about 2 MAC bags; Each MAC bag takies 16 slots; At this moment, the shared timeslot number of control channel is 16 * 2 * 3 (3 for interweaving)=96, and the shared time slot ratio of control channel is 16 * 2 * 3/256=37.5%;
When control channel speed is 76.8kbp/s; The most multiple 7 MAC bag in a control channel readjustment cycle, but generally all be controlled at about 2 MAC bags, each MAC bag accounts for 8 slots; At this moment, the shared time slot ratio of control channel is 8 * 2 * 3/256=18.75%;
Because coverage was smaller when control channel speed was 76.8kbp/s; The speed of therefore general control channel is main with 38.4kbp/s; This moment is too high and influence business datum for fear of the shared time slot ratio of control channel, has just adopted the shared time slot ratio value of control channel is controlled at a method in the threshold range its shared time slot ratio value 37.5% when generally this thresholding control channel speed of being the aforementioned calculation gained is 38.4kbp/s; Like this; When system statistics calculated control channel shared time slot ratio value has surpassed 37.5% in a control channel readjustment cycle, then the speed with control channel switches to 76.8kbp/s, and was as shown in table 2; After control channel adopts the speed of 76.8kbp/s; Its shared time slot ratio will descend, and drops to 37.5% when following up to control channel shared time slot ratio value in a control channel readjustment cycle, the speed of control channel is switched got back to 38.4kbp/s.
Table 2 thresholding comparing result and control channel speed correspondence table
| Speed (kbit/s) | Threshold setting | Enable |
| 38.4 | Less than set thresholding | True |
| 76.8 | Greater than set thresholding | False |
Below in conjunction with accompanying drawing and embodiment the method for the invention is done further to describe in detail.In the CDMA20001x EVDO system, the system of speed that dynamically adjusts control channel is as shown in Figure 1, and this system comprises the statistics that connects successively with timer, statistical module and rate controlled module, and wherein, the function of each module is following:
Statistics is used timer; After CDMA20001x EVDO system start-up, start; Be used for statistical operation is carried out timing, general measurement period is to be an integral multiple slots of 256slots or 256 in a control channel readjustment cycle, simultaneously; In same system, the time span of each statistical operation can be different;
Statistical module; After statistics starts with timer; This module is used to add up the ratio value of control channel shared timeslot number on forward channel; After statistics finishes with the timer timing, control channel shared time slot ratio value in a control channel readjustment cycle is sent to the rate controlled module;
The rate controlled module; Ratio value to timing inner control channel shared timeslot number on forward channel of receiving compares with the threshold value that is provided with in advance; Obtain speed adjustment result according to comparative result then, and send the message of carrying this speed adjustment result to CDMA20001x EVDO system;
Wherein, when the control channel of adding up in timing when shared time slot ratio value is greater than threshold value in a control channel readjustment cycle, rate controlled module notice CDMA20001x EVDO system selects 76.8kbit/s speed for use; When timing inner control channel when shared time slot ratio value is less than threshold value in a control channel readjustment cycle, rate controlled module notice CDMA20001x EVDO system selects 38.4kbit/s speed for use.
Said system realizes the dynamically process of the speed of adjustment control channel, and is as shown in Figure 2, may further comprise the steps:
Step 202 starts statistics and uses timer;
Step 204, statistics be with after the timer timing end, and statistical module calculates in the average shared time slot ratio value in a control channel readjustment cycle of timing inner control channel, and this ratio value is sent to the rate controlled module;
In this step; The threshold value that is provided with in advance can rule of thumb be provided with, for example; Demand to typical wireless environment characteristics and user; After the data under some commercial environments of complicate statistics and the accurate commercial environment, under the prerequisite that guarantees certain error rate performance, different rates can be set dispose pairing threshold range; Also can be provided with according to self adaptation adjustment; For example, through control channel shared time slot ratio in a control channel readjustment cycle of system's automatic statistics in a period of time, according to the ratio value of this statistics; Satisfying under the prerequisite of error rate, dynamically adjusting the corresponding thresholding of different rates configuration; Preferred threshold value is set between 30% to 37.5%.
In other embodiments, step 205 also can be carried out with step 202 simultaneously.In addition, in other embodiments, carry out in the operating process of rate controlled, statistics is with the timing of timer and/or the threshold value difference that is provided with in advance at every turn.
Can find out from the foregoing description; Technical scheme of the present invention is under the prerequisite that guarantees certain error rate performance; Different rates is set disposes pairing threshold range, therefore, more timely and accurately control channel speed is dynamically adjusted with respect to present manual operation control.
Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although the present invention is specified with reference to preferred embodiment; Those of ordinary skill in the art is to be understood that; Can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (8)
1. the method for a control channel rate dynamic adjustment is characterized in that,
In certain hour length; Whether statistics control channel shared time slot ratio value in a control channel readjustment cycle judges this ratio value greater than the threshold value that is provided with in advance, if; Then reporting system is selected the speed of 76.8kbit/s for use, otherwise reporting system is selected the speed of 38.4kbit/s for use.
2. the method for claim 1 is characterized in that,
Said threshold value scope is: 30% to 37.5%.
3. according to claim 1 or claim 2 method is characterized in that,
After this method reporting system is selected corresponding speed for use, empty the shared timeslot number of the control channel of being added up.
4. according to claim 1 or claim 2 method is characterized in that,
This method is carried out timing through a timer to statistical operation.
5. the system of a control channel rate dynamic adjustment is characterized in that,
This system comprises statistical module connected to one another and rate controlled module, wherein
Said statistical module is used in certain hour length, and statistics and calculation control channel are adjusted back shared time slot ratio value of cycle at a control channel, and this ratio value is sent to said rate controlled module;
Said rate controlled module; Be used to judge the said control channel received a control channel readjustment shared time slot ratio value of cycle whether greater than the threshold value that is provided with in advance; If then reporting system is selected the speed of 76.8kbit/s for use, otherwise reporting system is selected the speed of 38.4kbit/s for use.
6. system as claimed in claim 5 is characterized in that,
Said threshold value scope is: 30% to 37.5%.
7. like claim 5 or 6 described systems, it is characterized in that,
After said rate controlled module reporting system was selected corresponding speed for use, said statistical module emptied its control channel of adding up at a control channel readjustment shared timeslot number of cycle.
8. like claim 5 or 6 described systems, it is characterized in that,
This system comprises that also the statistics that links to each other with statistical module uses timer, and this timer is used for the statistical operation of said statistical module is carried out timing.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1801996A (en) * | 2006-01-20 | 2006-07-12 | 信息产业部电信传输研究所 | Charge loading method for cdma2000 1xEV-DO system covering test |
| CN1868159A (en) * | 2003-08-12 | 2006-11-22 | 艾利森电话股份有限公司 | Method of rate control |
| EP1755293A1 (en) * | 2000-05-12 | 2007-02-21 | Qualcomm Incorporated | Method and apparatus for rate adaption in packet data transmission |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1755293A1 (en) * | 2000-05-12 | 2007-02-21 | Qualcomm Incorporated | Method and apparatus for rate adaption in packet data transmission |
| CN1868159A (en) * | 2003-08-12 | 2006-11-22 | 艾利森电话股份有限公司 | Method of rate control |
| CN1801996A (en) * | 2006-01-20 | 2006-07-12 | 信息产业部电信传输研究所 | Charge loading method for cdma2000 1xEV-DO system covering test |
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