CN1134920C - Method of raising subzonal soft capacity of CDMA communication system - Google Patents
Method of raising subzonal soft capacity of CDMA communication system Download PDFInfo
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- CN1134920C CN1134920C CNB011054441A CN01105444A CN1134920C CN 1134920 C CN1134920 C CN 1134920C CN B011054441 A CNB011054441 A CN B011054441A CN 01105444 A CN01105444 A CN 01105444A CN 1134920 C CN1134920 C CN 1134920C
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Abstract
The present invention relates to a method for increasing the soft capacity of cells in a CDMA communication system. A soft capacity starting algorithm process and a soft capacity terminating algorithm process which execute jobs are stored in a memory of the system; the starting threshold value and the terminating threshold value of the soft capacity algorithm of cell loads are set; the load of the current system is measured, judgment of entering the soft capacity starting algorithm process or the soft capacity terminating algorithm process is carried out according to the condition of the load and the condition whether in the soft capacity algorithm process, and corresponding algorithm processes are executed according to judging results. The present invention downwards adjusts a target SIR value in inner loop power control by increasing the threshold value of a block error rate in the outer loop power control of the system so as to achieve the purpose of increasing the soft capacity.
Description
The present invention relates to a kind of code division multiple access (CDMA) communication system, relate in particular to a kind of method of raising sub-district soft capacity of cdma communication system.
CDMA is a kind of modulation and multiple access interconnection technique based on spread spectrum communication.Spread spectrum technic multiplies 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.In receiving end, multiply each other with identical pseudo random sequence and acknowledge(ment) signal, carry out related operation, with the spread-spectrum signal despreading.Yet, be not complete quadrature between the pseudo noise code, this causes existing between different user and the different channels phase mutual interference, these interference-limited the raising of cell capacity.When the interference by air interface was limited the sub-district heap(ed) capacity, this cell capacity was called the sub-district soft capacity, because the fixing maximum capacity of its neither one.
The cdma wireless network can not be runed under power-carrying.Power-carrying may be defined as theoretic heap(ed) capacity, and it can or analyze formula and estimate according to emulation.User's transmission rate, Business Nature (variable letter, sudden), professional quality requirement (time delay, bit error rate/frame error rate) and interruption rate are the principal elements of decision sub-district power-carrying.Load factor has then defined when network normally moves the degree near heap(ed) capacity.System's operation was just unstable when general load factor surpassed certain thresholding.
In order to make system stable, need carry out load control.Load control is a critical function of RRM.Generally speaking, if systems organization must be got well, capacity is enough, and access control and data packet dispatching are working properly, and the situation of overload can be rare.But, need load control to make system get back to targeted loads rapidly in case run into the overweight situation of load.Its principle is such, comes monitors interference by the sensing lead factor, and when the load factor of load factor above predefined, network can increase the sub-district soft capacity and alleviate load by following several method:
One is exactly to reduce to carry capacity for the channel information that the specific user uses, reduce message transmission rate, promptly reduce these users' bit rate, to there be those users' of time delay demand transmission delay to handle, perhaps make the calling call drop of low priority, if be lower than the load factor of predefined, load control will increase the bit rate that can handle the bit rate user.The increase of bit rate and minimizing can be finished according to priority level.
Two increasing this sub-district soft capacity by cell breathing reduces this cell load exactly, so-called cell breathing just is meant that the covering size of each sub-district is dynamic, when adjacent two sub-districts one light weigh, pilot transmit power is passed through to reduce in the heavy sub-district of load, make the edge customer of this sub-district because pilot frequency intensity is not enough, switch to neighbor cell, make load balancing, promptly be equivalent to increase capacity.
Above two kinds of strategies speech channel number that all can cause the sub-district to provide increase, thereby alleviate cell load.Yet first kind of mode can only be carried out at the specific user, can not carry out all business of all users in the sub-district, thereby regulating effect is limited, and to the specific user, minimum if its speed has transferred to, algorithm is with ineffective.Second method relates to complicated cell boarder to be calculated, each sub-district weighted power calculate and the sub-district between complex scheduling algorithm, so realize comparatively difficulty.
The object of the present invention is to provide a kind of method of the raising sub-district soft capacity of being convenient to implement that is used for code division multiple address communication system, this method can fast and effeciently increase the sub-district soft capacity and reduce cell load, and system is operated steadily.
In order to realize above-mentioned purpose, a kind of method that is used for the raising sub-district soft capacity of code division multiple address communication system provided by the present invention may further comprise the steps: one) startup soft capacity algorithm flow and the termination soft capacity algorithm flow of desiring to execute the task deposited in the memory of system; Two) cell load is measured the control initialization, comprise the enabling gate limit value of the soft capacity algorithm of setting cell load and stop threshold value; Three) measure current system load, and according to current system loading conditions with whether be in situation in the soft capacity algorithm flow, enter the judgement that starts the soft capacity algorithm flow or stop the soft capacity algorithm flow, and according to judged result, carry out corresponding algorithm flow: (1) surpasses the enabling gate limit value when system load, judge whether to have started the soft capacity algorithm: if then finish; If not, then enter startup soft capacity algorithm flow: a) the Block Error Rate threshold value assignment in the current system external circule power control is recovered thresholding to Block Error Rate; B) choose type of service and rate mode according to the current business situation, try to achieve a frame error rate after improving, and according to the frame error rate of agreement regulation and the relation of Block Error Rate, try to achieve Block Error Rate value after the corresponding raising by the frame error rate after improving; C) give Block Error Rate thresholding in the external circule power control of system the Block Error Rate value assignment after the raising of trying to achieve; D) increase according to the Block Error Rate threshold value in system's external circule power control comes the corresponding target signal interference ratio value of turning down in system's inner-loop power control, thereby reduces area interference, has improved soft capacity; (2) stop threshold value when system load is lower than the soft capacity algorithm, judge whether to have started the soft capacity algorithm: if not, then finish; If then enter and stop the soft capacity algorithm flow: carry out the recovery that Block Error Rate recovers thresholding.
Method in the above-mentioned raising sub-district soft capacity that is used for code division multiple address communication system, stop the soft capacity algorithm and comprise the following steps: one) recover to carry out between the thresholding classification processing in Block Error Rate value after the raising and Block Error Rate, obtain some middle Block Error Rate threshold value from high to low, and give the Block Error Rate thresholding the highest middle Block Error Rate thresholding assignment; Two) judge whether system load still stops below the threshold value at the soft capacity algorithm: (1) then enters the Block Error Rate thresholding recovers approximate procedure from thresholding to Block Error Rate: the Block Error Rate thresholding is turned down one-level more in this way; Wait for a set time; Judge whether the Block Error Rate thresholding is transferred to Block Error Rate and is recovered thresholding: if then finish; If not, then repeat described approximate procedure, till the Block Error Rate thresholding is transferred to Block Error Rate recovery thresholding; (2) as not being, then keep this Block Error Rate thresholding constant, finish.
In the method for the above-mentioned raising sub-district soft capacity that is used for code division multiple address communication system, the type of service of choosing in the step b) is determined by each type of service statistics.
Method in the above-mentioned raising sub-district soft capacity that is used for code division multiple address communication system, the method of asking for the frame error rate after the raising in the step b) is: according to the relation curve of speech quality average ratings score value and frame error rate under the gedanken experiment condition, try to achieve frame error rate after the corresponding raising by the speech quality average ratings score value that reduces.
Adopt above-mentioned technical scheme, promptly when cell load is overweight, turns down target SIR value in the inner-loop power control by increasing Block Error Rate (BLER) threshold value in system's external circule power control, thereby reduce area interference, reach the increase soft capacity, alleviate the purpose of load.The present invention except have realize simple, effectively and outside the high reliability features, characteristics also specific as follows:
(1) adopted the method for estimating the BLER that needs setting based on speech quality (MOS) score value, for target setting SIR in the external circule power control has provided foundation.Make BLER improve by external circule power control, or reach on the acceptable level, thereby make speech MOS score value remain on the acceptable level, guaranteed speech quality like this, increased number of available channels simultaneously, improved the success rate of user's access and reduced cutting off rate.
(2) method that adopts classification to regulate in stopping the soft capacity algorithm to a certain acceptable speech quality, is set corresponding BLER rank respectively according to loading condition, thereby is made that the adjusting of load and speech quality is mild, and system operates steadily.
The present invention is further illustrated below in conjunction with embodiment and accompanying drawing.
Fig. 1 is a soft capacity algorithm flow schematic diagram of the present invention.
As shown in Figure 1, the present invention, that is: a kind of method that is used for the raising sub-district soft capacity of code division multiple address communication system may further comprise the steps:
One) startup soft capacity algorithm flow and the termination soft capacity algorithm flow of desiring to execute the task deposited in the memory of system;
Two) cell load is measured the control initialization, comprise the enabling gate limit value of the soft capacity algorithm of setting cell load and stop threshold value;
Three) current system load is measured in physical layer, carry out the initialization setting by measurement control order, and according to current system loading conditions with whether be in situation in the soft capacity algorithm flow, enter the judgement that starts the soft capacity algorithm flow or stop the soft capacity algorithm flow, and, carry out corresponding algorithm flow according to judged result:
(1) surpass the enabling gate limit value when system load, trigger event produces measurement report, judges whether to have started the soft capacity algorithm:
If then finish;
If not, then enter startup soft capacity algorithm flow:
A) the Block Error Rate thresholding assignment in the current system external circule power control is recovered thresholding to Block Error Rate;
B) choose type of service and rate mode according to the current business situation, can choose frame error rate is required the harshest type of service or by the determined type of service of each type of service statistics, then to selected type of service and rate mode, relation curve according to speech quality average ratings score value and frame error rate under the gedanken experiment, by the frame error rate that reduces after speech quality average ratings score value is tried to achieve raising, speech quality average ratings score value can be reduced to acceptable speech quality average ratings score value, it is exactly acceptable frame error rate that institute tries to achieve, and, try to achieve accordingly by acceptable frame error rate and can accept the Block Error Rate thresholding according to the frame error rate of agreement regulation and the relation of Block Error Rate;
C) give Block Error Rate thresholding in the external circule power control of system the Block Error Rate the accepted value assignment of trying to achieve, as the Block Error Rate the accepted thresholding of all classs of business and rate mode;
D) can accept the Block Error Rate threshold value according to being increased to of the Block Error Rate thresholding in system's external circule power control and come the corresponding target signal interference ratio value of turning down in system's inner-loop power control, thereby reduce area interference, improve soft capacity.
(2) stop threshold value when system load is lower than the soft capacity algorithm, trigger event produces measurement report, judges whether to have started the soft capacity algorithm:
If not, then finish;
If then enter and stop the soft capacity algorithm flow:
A) between acceptable Block Error Rate thresholding and Block Error Rate thresholding recovery value, carry out classification and handle, obtain some middle Block Error Rate threshold value from high to low, and give the Block Error Rate thresholding the highest middle Block Error Rate thresholding assignment;
B) judge whether system load still stops below the threshold value at the soft capacity algorithm:
In this way, then enter the Block Error Rate thresholding recovers approximate procedure from thresholding to Block Error Rate: the Block Error Rate thresholding is turned down one-level again; Wait for a set time; Judge whether the Block Error Rate thresholding is transferred to Block Error Rate and is recovered thresholding: if then finish; If not, then repeat described approximate procedure, till the Block Error Rate thresholding is transferred to Block Error Rate recovery thresholding;
As not being, then keep this Block Error Rate thresholding constant, finish.
For example, a sub-district, since the restriction of hardware aspect, the voice service higher to speech quality, such as its requirement to BLER is 0.5%, and the cell uplink power-carrying is N, the load factor that the sub-district allows is 75%.Then can set soft capacity algorithm enabling gate and be limited to 0.75N according to 75% load factor.Load factor according to 70%, setting soft capacity algorithm termination thresholding is 0.7N.
Suppose that each travelling carriage is connected with the base station with higher speech quality at first in the sub-district, communicate that cell load is 0.7N, is in normal condition.If several new user requests of making a call are arranged now, if whole accesses can cause the load recruitment of 0.1N.According to calculating as can be known, suppose that these new service request from user all satisfy, then the cell load factor is 0.8, will be above the maximum load factor that allows.In this case, the result that may cause has three, one, and system's access control makes the new user of part not insert.The 2nd, originally the user of Jie Ruing can cause call drop because load is overweight.The 3rd, because load surmounts the maximum load of permission, system may collapse.
If the soft capacity algorithm among employing the present invention then can obviously be avoided above rough sledding.At this moment, when periodic measurement found that load factor surmounts 0.75, the meeting trigger event sent measurement report.According to measurement report, system start-up soft capacity algorithm.According to the communication quality standard, suppose that acceptable speech quality MOS score value is 3.5, in the sub-district for guaranteeing speek voice quality, it is AMR (adaptive multi-rate) 5.15kbit/s that the BLER value is required the strictest type of service and rate mode thereof, then can roughly estimate that to the influence curve of MOS score value its BLER value corresponding with accepting speech quality is 1% according to its BLER.At this moment, can heighten sub-district external circule power control BLER desired value to 1% immediately, and target SIR (signal interference ratio) value in the corresponding reduction inner-loop power control and reduce the transmitting power of each travelling carriage by inner-loop power control, thereby arrive effective increase system soft capacity, reduce system load, the purpose that increases user's access rate and reduced cutting off rate.
In sum, because what regulate in the present invention is BLER threshold value in the external circule power control, thereby has an effect to all rate modes of all users in the sub-district, so algorithm is effective fast.And algorithm only relates to the adjusting to sub-district BLER threshold value, and all business of sub-district are all used unified accepted BLER value, so that algorithm is realized is simple, and the reliability height.In addition, because the estimation that BLER can be accepted in the sub-district is to be that object carries out so that BLER value is required the strictest type of service and rate mode thereof, so when algorithm moves, can guarantee that all professional speech qualities all are in acceptable normal level.Find that the cell load factor begins to be lower than 0.7 in case physical layer is measured, system can stop the soft capacity algorithm at once, simultaneously, progressively adjusts external circule power control BLER desired value, makes the speech quality of each voice service return to previous level.
Claims (4)
1. a method that is used for the raising sub-district soft capacity of code division multiple address communication system is characterized in that, may further comprise the steps:
One) startup soft capacity algorithm flow and the termination soft capacity algorithm flow of desiring to execute the task deposited in the memory of system;
Two) cell load is measured the control initialization, comprise the enabling gate limit value of the soft capacity algorithm of setting cell load and stop threshold value;
Three) measure current system load, and according to current system loading conditions with whether be in situation in the soft capacity algorithm flow, enter the judgement that starts the soft capacity algorithm flow or stop the soft capacity algorithm flow, and, carry out corresponding algorithm flow according to judged result:
(1) surpass the enabling gate limit value when system load, judge whether to have started the soft capacity algorithm:
If then finish;
If not, then enter startup soft capacity algorithm flow:
A) the Block Error Rate threshold value assignment in the current system external circule power control is recovered thresholding to Block Error Rate;
B) choose type of service and rate mode according to the current business situation, try to achieve a frame error rate after improving, and according to the frame error rate of agreement regulation and the relation of Block Error Rate, try to achieve Block Error Rate value after the corresponding raising by the frame error rate after improving;
C) give Block Error Rate thresholding in the external circule power control of system the Block Error Rate value assignment after the raising of trying to achieve;
D) increase according to the Block Error Rate threshold value in system's external circule power control comes the corresponding target signal interference ratio value of turning down in system's inner-loop power control, thereby reduces area interference, has improved soft capacity;
(2) stop threshold value when system load is lower than the soft capacity algorithm, judge whether to have started the soft capacity algorithm:
If not, then finish;
If then enter and stop the soft capacity algorithm flow: carry out the recovery that Block Error Rate recovers thresholding.
2. a kind of method that is used for the raising sub-district soft capacity of code division multiple address communication system according to claim 1 is characterized in that described termination soft capacity algorithm comprises the following steps:
One) recovers to carry out the classification processing between the thresholding in Block Error Rate value after the raising and Block Error Rate, obtain some middle Block Error Rate threshold value from high to low, and give the Block Error Rate thresholding the highest middle Block Error Rate thresholding assignment;
Two) judge whether system load still stops below the threshold value at the soft capacity algorithm:
(1) in this way, then enter the Block Error Rate thresholding recovers approximate procedure from thresholding to Block Error Rate:
The Block Error Rate thresholding is turned down one-level again;
Wait for a set time;
Judge whether the Block Error Rate thresholding is transferred to Block Error Rate and is recovered thresholding:
If then finish;
If not, then repeat described approximate procedure, till the Block Error Rate thresholding is transferred to Block Error Rate recovery thresholding;
(2) as not being, then keep this Block Error Rate thresholding constant, finish.
3. a kind of method that is used for the raising sub-district soft capacity of code division multiple address communication system according to claim 1 is characterized in that the type of service of choosing in the described step b) is determined by each type of service statistics.
4. a kind of method that is used for the raising sub-district soft capacity of code division multiple address communication system according to claim 1, it is characterized in that, the method of asking for the frame error rate after the raising in the described step b) is: according to the relation curve of speech quality average ratings score value and frame error rate under the gedanken experiment condition, try to achieve frame error rate after the corresponding raising by the speech quality average ratings score value that reduces.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB011054441A CN1134920C (en) | 2001-02-27 | 2001-02-27 | Method of raising subzonal soft capacity of CDMA communication system |
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| CNB011054441A CN1134920C (en) | 2001-02-27 | 2001-02-27 | Method of raising subzonal soft capacity of CDMA communication system |
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| CN1134920C true CN1134920C (en) | 2004-01-14 |
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| US9497659B2 (en) * | 2012-08-31 | 2016-11-15 | Qualcomm Incorporated | Directional adjustment to quality of service based on monitored traffic activity on a link |
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