CN101547030A - System and method for dynamically adjusting target frame error rate in code division multiple access communication system - Google Patents
System and method for dynamically adjusting target frame error rate in code division multiple access communication system Download PDFInfo
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- CN101547030A CN101547030A CN200810089112A CN200810089112A CN101547030A CN 101547030 A CN101547030 A CN 101547030A CN 200810089112 A CN200810089112 A CN 200810089112A CN 200810089112 A CN200810089112 A CN 200810089112A CN 101547030 A CN101547030 A CN 101547030A
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Abstract
The invention discloses a method for dynamically adjusting the target frame error rate in a code division multiple access communication system, which comprises the steps: reducing the capacity of information carrying of a channel used by a user when the system has light overload; and improving the target frame error rate when the system has severe overload. The invention also discloses a system for dynamically adjusting the target frame error rate in the code division multiple access communication system. The method and the system dynamically adjust the target frame error rate on the basis of keeping the average evaluation score of speech quality at an acceptable level, ensure the speech quality, increase the number of usable channels at the same time, and improve the success ratio of user access and reduce the call-drop rate of users, thereby improving the performance of the system.
Description
Technical field
The present invention relates to CDMA (Code Division Multiple Access, the code division multiple access inserts) communications field, relate in particular to the system and method for dynamically adjusting target frame error rate in a kind of cdma communication system.
Background technology
Comprise power management based on the RRM in the system of CDMA, mobile management, aspects such as load management and channel allocation.Wherein power management is an important link, and this is because power is final Radio Resource in cdma system, is exactly the use of strict power controlling so use the only resource of Radio Resource most effectively.
In the power management part, on the one hand, improve and to improve this user's QoS (Quality of Service, service quality) at certain user's transmitting power; On the other hand, because the self-interference of cdma system.Because CDMA adopts spread spectrum, all signals are shared same frequency spectrum, and the signal energy of each travelling carriage is dispensed in the whole frequency band scope, just become noise like this concerning other travelling carriages.This shows, because the self-interference of cdma system, can cause the reduction of other user's qualities of reception to the raising of certain user's transmitting power.So the use of power is contradiction in cdma system.
On the other hand, there is shade in the radio environment, multipath fading and remote loss influence, the position of honeycomb fashion travelling carriage in the sub-district is at random and frequent change, so path loss can significantly change.How to carry out effective power control, at utmost reduce transmitting power under the prerequisite of the service quality that guarantees customer requirements, reduce system interference, increasing power system capacity is key crucial in the CDMA technology.
In power control, comprise forward power control and transmission power of mobile station control.Wherein, base station transmitting power is promptly controlled in forward power control.Forward power control is usually based on measurement report.In order to support the control of forward direction measurement report power, travelling carriage is to base station report frame error rate statistics.If base station initiated cyclic pattern, travelling carriage will be reported the frame error rate statistics on assigned timeslot; If base station initiated thresholding pattern, when frame error rate reaches appointed threshold, travelling carriage will be reported the frame error rate statistics.
Specifically, parameter PWR_PERIOD_ENABLE is set to 1 under the cyclic pattern; Parameter PWR_THRESH_ENABLE is set to 1 under the thresholding pattern.Under these two kinds of patterns, travelling carriage is equipped with forward fundamental channel and receives frame total counter (TOT_FRAMES) and forward fundamental channel discovery mistake frame number counter (BAD_FRAMES).Travelling carriage is adding 1 with TOT_FRAMES when the forward direction primary channel receives a frame, when the frame that receives is the mistake frame BAD_FRAMES is added 1.Travelling carriage gives the correct time on measurement report, with TOT_FRAMES and BAD_FRAMES zero clearing.The one-period of travelling carriage after measurement report sends promptly will not increase the value of counter TOT_FRAMES and BAD_FRAMES in the PWR_REP_DELAY*4 frame.Wherein, PWR_REP_DELAY is a delay parameter.
Under above-mentioned two kinds of Report modes, what power measurement was reported reports opportunity as follows: if under the thresholding pattern, PWR_THRESH_ENABLE equals 1, and BAD_FRAMES equals upper limit thresholding (PWR_REP_THRESH), then travelling carriage will send a Power Measurement Report Message (PMRM) and give the base station, report totalframes and mistake frame number; If under cyclic pattern, PWR_PERIOD_ENABLE equals 1, and TOT_FRAMES equals (2^ (PWR_REP_FRAMES/2) * 5), then travelling carriage will send a power measurement report information to the base station, report totalframes and mistake frame number, need to prove, for conserve system resources, totalframes when representing to report PMRM with the exponential form of periodic report parameter (PWR_REP_FRAMES), so just can show the totalframes when bigger needs report PMRM with less numerical table, thereby save system resource.
Adopt the mode that reports of thresholding pattern in the existing technology, and close under the situation of cyclic pattern, corresponding data configuration is: PWR_REP_THRESH=2; PWR_REP_FRAMES=9; PWR_THRESH_ENABLE=1; PWR_PERIOD_ENABLE=0; PWR_REP_DELAY=1.
In the above-mentioned prior art, its BSC (Base Station Controller, base station controller) side to utilize power measurement report to carry out the forward power controlled step as follows:
At first, BSC sets up the back startup in BTS channel and waits for the measurement report timer.Wherein, wait for that the measurement report length of timer is set by the technical staff and the counter of travelling carriage and irrelevant.
Secondly, when waiting for the measurement report timer expiry, BSC reduces a decline step-length with forward power, restarts and waits for the measurement report timer.Wherein, decline step-length is set by the technical staff.
The 3rd, if BSC receives measurement report, then stop to wait for the measurement report timer and calculate frame error rate according to the measurement report content.
At last, if frame error rate〉target frame error rate, then forward power is improved a rising step-length; If actual frame error rate is lower than target frame error rate.Then forward power is reduced a decline step-length.BSC is restarted and is waited for the measurement report timer after adjusting power.Wherein, rising step-length and decline step-length branch are arranged, and do not have restricting relation each other, and target frame error rate is determined by the requirement of system and agreement.For example: target frame error rate is set at 2%, and when calculating frame error rate when being 50%, a rising step-length then rises forward power.
In actual applications, there is following problem in such scheme: target frame error rate is fixed in the existing technical scheme, can not adjust target frame error rate in time according to the overload situations of system, saves the power of system.Generally speaking, even systems organization is relatively good, the excessive situation of frame error rate still can often occur, in case occur, will improve the base station system transmitting power, because the gross power of system is fixing and limited, so just be difficult to satisfy.That just needs load control to make system get back to targeted loads rapidly.
Summary of the invention
The technical problem to be solved in the present invention is exactly the system and method that proposes dynamically to adjust in a kind of cdma communication system target frame error rate, overcome the defective that in time to adjust target frame error rate in the prior art according to the overload situations of system, can dynamically adjust target frame error rate, improve the performance of system.
In order to solve the problems of the technologies described above, the invention provides the method for dynamically adjusting target frame error rate in a kind of code division multiple access communication system, when slight overload appears in system, reduce the capacity that the user uses channel information to carry; When the severe overload appears in system, improve target frame error rate.
Further, described reduction user uses the capacity of the certain limit that capacity that channel information carries carries for the specific user's that reduces lower priority use channel information, and the specific user of described lower priority is selected from a part of terminal use.
Further, when severe when overload appears in system, estimate according to the speech quality values of acceptable reduction target frame error rate after the raising voice quality average ratings score value to be remained on the acceptable level.
Further, the speech quality values of described acceptable reduction is selected according to the relation curve of voice quality average ratings score value and frame error rate under the gedanken experiment.
Further, described method comprises the steps:
Set the enabling gate limit value and the termination threshold value of the dynamic adjustment target frame error rate of cell load, and the severe overload threshold;
Measure current system loading conditions;
Start thresholding and surpass the severe overload threshold if load surpasses, then keep voice quality average ratings score value to remain on the acceptable level, improve target frame error rate;
If load surpasses the enabling gate limit value, but surpass the severe overload threshold, then reduce the capacity of the certain limit that the specific user's of lower priority use channel information carries;
If load is lower than the termination threshold value, then recover the capacity that carries of target frame error rate and recovery specific user's use channel information.
In order to solve the problems of the technologies described above, the present invention also provides the system that dynamically adjusts target frame error rate in a kind of code division multiple access communication system, comprising: network management center, base station controller BSC, base transceiver station BTS;
The speech quality values of the acceptable reduction that described network management center is used to dispose and the specific user of lower priority, and when data sync, the speech quality values of acceptable reduction and the specific user of lower priority are synchronized to BTS by BSC;
Described BSC is used to measure current system loading conditions, and according to system loading conditions, carries out respective handling: when slight overload appears in system, and the capacity of the certain limit that the specific user's of control BTS reduction lower priority use channel information carries; When the severe overload appearred in system, control BTS improved target frame error rate according to the speech quality values of acceptable reduction.
Further, the speech quality values of described acceptable reduction is selected according to the relation curve of voice quality average ratings score value and frame error rate under the gedanken experiment.
Further, described BSC also is used to carry out cell load and measures the control initialization, and comprise the enabling gate limit value of the dynamic adjustment target frame error rate of setting cell load and stop threshold value, and the severe overload threshold.
Further, described BSC measures current system loading conditions, and according to system loading conditions, carry out respective handling, comprise: when load surpasses the enabling gate limit value, and when surpassing the severe overload threshold, control BTS improves target frame error rate according to the speech quality values of acceptable reduction; When load surpasses the enabling gate limit value, but when surpassing the severe overload threshold, control BTS reduces the capacity of the certain limit that the specific user's of lower priority use channel information carries; When load is lower than the termination threshold value, then control the capacity that carries that BTS recovers target frame error rate and recovers specific user's use channel information.
Further, described BTS comprises database, base station side configuration application module CAP, channel board;
Wherein, described database is used to notify CAP to dispose the speech quality values of acceptable reduction and the specific user of lower priority, described CAP is used for sending the speech quality values of the acceptable reduction of disposing and the specific user of lower priority to channel board, described channel board disposes the speech quality values of acceptable reduction and the specific user of lower priority according to relevant parameter, and carries out corresponding operating according to the control of BSC.
The present invention is in cdma communication system, on the basis that keeps the acceptable level of voice quality average ratings score value, dynamically adjust target frame error rate, guaranteed voice quality like this, increased simultaneously number of available channels again, improve the success rate of user's access and reduced the conversation loss rate, thereby improved the performance of system.
Description of drawings
Fig. 1 is the system block diagram of the embodiment of the invention;
Fig. 2 is the flow chart of the embodiment of the invention.
Embodiment
Technical scheme main points of the present invention are:
When slight overload appearred in system, the capacity of the certain limit that the specific user's of reduction lower priority use channel information carries reduced message transmission rate, reduces bit rate, thereby had in a disguised form heightened these users' target frame error rate;
When the severe overload appears in system, adopt according to the voice quality score value and estimate the target frame error rate that needs are set.That is: according to the relation curve of voice quality average ratings score value and frame error rate under the gedanken experiment, try to achieve target frame error rate after the corresponding raising by the voice quality average ratings score value of acceptable reduction.Control by power again, thereby make voice quality average ratings score value remain on the acceptable level, guaranteed voice quality like this, increased number of available channels simultaneously again, improve the success rate of user's access and reduced the conversation loss rate, thereby improved the availability of system.
The present invention is described in detail below in conjunction with drawings and the specific embodiments.
As shown in Figure 1, the system of the dynamic adjustment target frame error rate of the embodiment of the invention comprises: network management center, BSC (Base Station Controller base station controller), BTS (Base Transceiver Station, base transceiver station);
Wherein, the speech quality values of the acceptable reduction that described network management center is used to dispose and the specific user of lower priority, and when data sync, the specific user of the speech quality values of acceptable reduction and lower priority is synchronized to the database of BTS by BSC;
The speech quality values of described acceptable reduction is selected according to the relation curve of voice quality average ratings score value and frame error rate under the gedanken experiment;
The specific user of described lower priority is selected from a part of terminal use;
Described BSC is used to carry out cell load and measures the control initialization, measures current system loading conditions, and according to system loading conditions, carries out respective handling: when load surpasses the enabling gate limit value, and when surpassing the severe overload threshold, improve target frame error rate; When load surpasses the enabling gate limit value, but when surpassing the severe overload threshold, reduce the capacity of the certain limit that the specific user's of lower priority use channel information carries; When load is lower than the termination threshold value, then recover target frame error rate and recover the specific user the use channel information to carry capacity normal;
Described BTS comprises database, CAP (base station side configuration application module), channel board;
Wherein, described database is used to notify CAP to dispose the speech quality values of acceptable reduction and the specific user of lower priority, described CAP is used for sending the speech quality values of the acceptable reduction of disposing and the specific user of lower priority to channel board, described channel board disposes the speech quality values of acceptable reduction and the specific user of lower priority according to relevant parameter, and carries out corresponding operating according to the control of BSC.
As shown in Figure 2, the method for the embodiment of the invention comprises the steps:
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1, dynamically adjusts the method for target frame error rate in a kind of code division multiple access communication system, it is characterized in that, when slight overload appears in system, reduce the capacity that the user uses channel information to carry; When the severe overload appears in system, improve target frame error rate.
2, the method for claim 1, it is characterized in that, described reduction user uses the capacity of the certain limit that capacity that channel information carries carries for the specific user's that reduces lower priority use channel information, and the specific user of described lower priority is selected from a part of terminal use.
3, the method for claim 1 is characterized in that, when severe when overload appears in system, estimates according to the speech quality values of acceptable reduction target frame error rate after the raising voice quality average ratings score value to be remained on the acceptable level.
4, method as claimed in claim 3 is characterized in that, the speech quality values of described acceptable reduction is selected according to the relation curve of voice quality average ratings score value and frame error rate under the gedanken experiment.
5, the method for claim 1 is characterized in that, described method comprises the steps:
Set the enabling gate limit value and the termination threshold value of the dynamic adjustment target frame error rate of cell load, and the severe overload threshold;
Measure current system loading conditions;
Start thresholding and surpass the severe overload threshold if load surpasses, then keep voice quality average ratings score value to remain on the acceptable level, improve target frame error rate;
If load surpasses the enabling gate limit value, but surpass the severe overload threshold, then reduce the capacity of the certain limit that the specific user's of lower priority use channel information carries;
If load is lower than the termination threshold value, then recover the capacity that carries of target frame error rate and recovery specific user's use channel information.
6, dynamically adjust the system of target frame error rate in a kind of code division multiple access communication system, it is characterized in that, comprising: network management center, base station controller BSC, base transceiver station BTS;
The speech quality values of the acceptable reduction that described network management center is used to dispose and the specific user of lower priority, and when data sync, the speech quality values of acceptable reduction and the specific user of lower priority are synchronized to BTS by BSC;
Described BSC is used to measure current system loading conditions, and according to system loading conditions, carries out respective handling: when slight overload appears in system, and the capacity of the certain limit that the specific user's of control BTS reduction lower priority use channel information carries; When the severe overload appearred in system, control BTS improved target frame error rate according to the speech quality values of acceptable reduction.
7, system as claimed in claim 6 is characterized in that, the speech quality values of described acceptable reduction is selected according to the relation curve of voice quality average ratings score value and frame error rate under the gedanken experiment.
8, system as claimed in claim 6 is characterized in that, described BSC also is used to carry out cell load and measures the control initialization, comprise the enabling gate limit value of the dynamic adjustment target frame error rate of setting cell load and stop threshold value, and the severe overload threshold.
9, system as claimed in claim 8, it is characterized in that, described BSC measures current system loading conditions, and according to system loading conditions, carry out respective handling, comprise: when load surpasses the enabling gate limit value, and when surpassing the severe overload threshold, control BTS improves target frame error rate according to the speech quality values of acceptable reduction; When load surpasses the enabling gate limit value, but when surpassing the severe overload threshold, control BTS reduces the capacity of the certain limit that the specific user's of lower priority use channel information carries; When load is lower than the termination threshold value, then control the capacity that carries that BTS recovers target frame error rate and recovers specific user's use channel information.
10, system as claimed in claim 9 is characterized in that, described BTS comprises database, base station side configuration application module CAP, channel board;
Wherein, described database is used to notify CAP to dispose the speech quality values of acceptable reduction and the specific user of lower priority, described CAP is used for sending the speech quality values of the acceptable reduction of disposing and the specific user of lower priority to channel board, described channel board disposes the speech quality values of acceptable reduction and the specific user of lower priority according to relevant parameter, and carries out corresponding operating according to the control of BSC.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113825221A (en) * | 2021-08-19 | 2021-12-21 | 西安闻泰信息技术有限公司 | Power control method and device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113825221A (en) * | 2021-08-19 | 2021-12-21 | 西安闻泰信息技术有限公司 | Power control method and device |
| WO2023019842A1 (en) * | 2021-08-19 | 2023-02-23 | 西安闻泰信息技术有限公司 | Power control method and apparatus |
| CN113825221B (en) * | 2021-08-19 | 2023-11-17 | 昆明闻讯实业有限公司 | Power control method and device |
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Application publication date: 20090930 |