CN101207435B - Method for modulating down special channel speed - Google Patents

Abstract

The invention discloses a method for lowering the rate of a dedicated channel. Step S102, configure the 4B relative threshold; step S104, calculate all 4B thresholds corresponding to all transmission formats corresponding to the current service type according to the 4B relative threshold; step S106, the current traffic usage is less than the 4B corresponding to the current transmission format When the threshold is reached, compare the current traffic usage with the 4B threshold that reduces the transmission format one by one, and when it is found that the current traffic usage is less than the 4B threshold that reduces j transmission formats and is greater than j+1 transmissions When the 4B threshold of the format is reached, the decision will lower the rate by j levels. The DCH channel rate is dynamically adjusted according to the actual business volume, which improves system performance and code resource utilization.

Description

Dedicated Channel Rate Down Method

technical field

The invention relates to wireless communication technology, in particular to a method for lowering the rate of a dedicated channel.

Background technique

In WCDMA (Wideband Code Division Multiple Access, Wideband Code Division Multiple Access) system, RRC (Radio Resource Control, Radio Resource Control) performs dynamic radio bearer control by configuring Traffic Volume Measurements. The main principle is: when the business volume measurement value BO (Buffer Occupancy) is greater than a certain threshold 4A Threshold, a 4A event is reported as a trigger for the migration process (4A Event) from a low-rate radio bearer to a high-rate radio bearer or as a constraint condition for migration. When the service volume measurement value BO (Buffer Occupancy) is less than a certain threshold 4BThreshold, a 4B event is reported to trigger the process of migrating high-rate radio bearers to low-rate radio bearers (4B Event) or as a constraint condition for migration. Through this dynamic wireless bearer control mechanism based on user traffic, system capacity and service quality are provided.

The channel rate of DCH (Dedicated CHannel, dedicated channel) is lowered, and the 4B event is triggered by reporting BO Measurement. Two thresholds are set for traffic measurement, namely 4A threshold and 4B threshold. When the RNC (Radio Network Controller, wireless network controller) memory usage reaches or is less than the 4B threshold, 4B events are reported. When the reported 4B events reach a certain number of times , down-regulate the DCH channel rate according to certain rules.

The 4B threshold is configured by the background. When the number of reported 4B events reaches a certain number, the level of rate adjustment is a problem that needs to be considered. If the 4B event is triggered, the rate is adjusted downward according to the level. From the perspective of system stability, adjustment oscillation can be avoided. If the downward adjustment is made in a multi-level manner, the business can be quickly adjusted. The required rate quickly releases the code resources occupied by the service, but increases the occurrence of rate adjustment oscillations. Under normal circumstances, the 4B threshold is configured by the background with a relative percentage, and the foreground multiplies the relative percentage by a base to obtain an absolute threshold, and then the system compares the current memory usage BO with the absolute threshold calculated by the foreground, if it is less than, then Report the 4B event and lower the rate. Then, how to dynamically determine the rate reduction level according to the current traffic situation is not described in the protocol or the currently public algorithm.

Therefore, a DCH rate reduction algorithm is needed, which can flexibly determine the rate reduction level according to the current memory usage, so as to achieve the purpose of improving system performance and code resource utilization.

Contents of the invention

The main purpose of the present invention is to provide a dedicated channel rate reduction method for reconfiguring the DCH channel rate reduction algorithm to improve system performance and code resource utilization.

In order to achieve the above object, the present invention provides a dedicated channel rate reduction method. The dedicated channel rate reduction method includes the following steps:

Step S102, configure 4B relative threshold;

Step S104, calculating all 4B thresholds corresponding to all transmission formats corresponding to the current service type according to the 4B relative threshold;

Step S106, when the current traffic occupancy is less than the 4B threshold corresponding to the current transmission format, compare the current traffic occupancy with the 4B threshold that reduces the transmission format one by one, and when it is found that the current traffic occupancy is less than the reduced 4B threshold When the 4B threshold of j transmission formats is greater than the 4B threshold of j+1 transmission formats, it is decided to lower the rate by j levels.

Optionally, in step S104, according to the set TFS={TF1, TF2, ..., TFn} of transport formats corresponding to all service types, calculate the 4B threshold set 4BS = {4B1, 4B2, ..., 4Bn }. 4Bn=(RTT/tti)×number of transport blocks corresponding to TFn×transport block size×4B relative threshold, where RTT is a fixed value configured according to the round-trip time, and tti is the scheduling period.

Further, in step S106, according to the current rate state, select the current transport format subset TFs={TF1, TF2,...,TFm}, where m<=n, and select the 4B threshold subset 4Bs={4B1 ,4B2,...,4Bm}.

Further, when the current traffic occupancy BO is less than or equal to 4Bm-1, compare BO with the 4B threshold in the 4B threshold subset 4Bs, and if 4Bm-j-1<BO<=4Bm-j, the decision will be The rate is lowered by j levels, and the current transmission format subset TFs is adjusted to {TF1, TF2, ..., TFm-j}.

Optionally, in step S102, a 4B event reporting times threshold is configured.

Further, in step S104, according to the set TFS={TF1, TF2, ..., TFn} of the transport formats corresponding to all service types, calculate the 4B threshold set 4BS = {4B1, 4B2, ..., 4Bn} , where 4Bn=(RTT/tti)×number of transport blocks corresponding to TFn×transport block size×4B relative threshold, where RTT is a fixed value configured according to the round-trip time, and tti is the scheduling period.

Further, in step S106, according to the current rate state, select the current transport format subset TFs={TF1, TF2,...,TFm}, where m<=n, and select the 4B threshold subset 4Bs={4B1 ,4B2,...,4Bm}.

Further, configure the current 4B event reporting counter array 4BCounter={4BCounter(1), 4BCounter(2), . . . , 4BCounter(m)}.

Further, the rate reduction level is determined through the following steps:

Step S202, when the business volume occupancy BO is less than or equal to 4Bm-1, report the 4B event, 4BCounter(1)=4BCounter(1)+1;

Step S204, detecting the element j corresponding to BO in the 4B threshold subset 4Bs, and the j satisfies 4Bj>BO>=4Bj-1;

Step S206, 4BCounter(i)=4BCounter(i)+1, wherein, i=j,...,m-1;

Step S208, detecting the element 4BCounter(k) in the 4B event reporting counter array 4BCounter, if there is 4BCounter(k)>=4B event reporting times threshold, then find the maximum value K in it, determine that the rate is lowered by m-K level, and set The 4B event reporting counter array 4BCounter is reset and cleared, the current transmission format subset TFs is adjusted to {TF1, TF2, . . . , TFm-K}, return to step S106, otherwise return to step S202.

The dedicated channel rate reduction method is applied to a wideband code division multiple access system.

Through the above technical solution, the present invention can dynamically adjust the DCH channel rate according to the actual business volume, thereby improving system performance and code resource utilization.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

Fig. 1 is the flowchart of the dedicated channel rate reduction method according to the present invention; and

Fig. 2 is a flow chart of a DCH channel rate reduction algorithm according to an embodiment of the present invention.

Detailed ways

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

With reference to Fig. 1, the dedicated channel rate reduction method according to the present invention comprises the following steps:

Step S102, configuring a 4B relative threshold.

Step S104, according to the 4B relative threshold, calculate all 4B thresholds corresponding to all transmission formats corresponding to the current service type.

Step S106, when the current traffic occupancy is less than the 4B threshold corresponding to the current transmission format, compare the current traffic occupancy with the 4B threshold that reduces the transmission format one by one, and when it is found that the current traffic occupancy is less than the reduced 4B threshold When the 4B threshold of j transmission formats is greater than the 4B threshold of j+1 transmission formats, it is decided to lower the rate by j levels.

Optionally, in step S104, according to the set TFS={TF1, TF2, ..., TFn} of transport formats corresponding to all service types, calculate the 4B threshold set 4BS = {4B1, 4B2, ..., 4Bn }. 4Bn=(RTT/tti)×number of transport blocks corresponding to TFn×transport block size×4B relative threshold, where RTT is a fixed value configured according to the round-trip time, and tti is the scheduling period.

Further, in step S106, according to the current rate state, select the current transport format subset TFs={TF1, TF2,...,TFm}, where m<=n, and select the 4B threshold subset 4Bs={4B1 ,4B2,...,4Bm}.

Further, when the current traffic occupancy BO is less than or equal to 4Bm-1, compare BO with the 4B threshold in the 4B threshold subset 4Bs, and if 4Bm-j-1<BO<=4Bm-j, the decision will be The rate is lowered by j levels, and the current transmission format subset TFs is adjusted to {TF1, TF2, ..., TFm-j}.

Optionally, in step S102, a 4B event reporting times threshold is configured.

Further, in step S104, according to the set TFS={TF1, TF2, ..., TFn} of the transport formats corresponding to all service types, calculate the 4B threshold set 4BS = {4B1, 4B2, ..., 4Bn} , where 4Bn=(RTT/tti)×number of transport blocks corresponding to TFn×transport block size×4B relative threshold, where RTT is a fixed value configured according to the round-trip time, and tti is the scheduling period.

Further, in step S106, according to the current rate state, select the current transport format subset TFs={TF1, TF2,...,TFm}, where m<=n, and select the 4B threshold subset 4Bs={4B1 ,4B2,...,4Bm}.

Further, configure the current 4B event reporting counter array 4BCounter={4BCounter(1), 4BCounter(2), . . . , 4BCounter(m)}.

Further, the rate reduction level is determined through the following steps:

Step S202, when the business volume occupancy BO is less than or equal to 4Bm-1, report the 4B event, 4BCounter(1)=4BCounter(1)+1;

Step S204, detecting the element j corresponding to BO in the 4B threshold subset 4Bs, and the j satisfies 4Bj>BO>=4Bj-1;

Step S206, 4BCounter(i)=4BCounter(i)+1, wherein, i=j,...,m-1;

Step S208, detecting the element 4BCounter(k) in the 4B event reporting counter array 4BCounter, if there is 4BCounter(k)>=4B event reporting times threshold, then find the maximum value K in it, determine that the rate is lowered by m-K level, and set The 4B event reporting counter array 4BCounter is reset and cleared, the current transmission format subset TFs is adjusted to {TF1, TF2, . . . , TFm-K}, return to step S106, otherwise return to step S202.

The dedicated channel rate reduction method is applied to a wideband code division multiple access system.

The invention relates to a DCH channel rate down-regulation algorithm of a WCDMA system, so as to improve the performance of the WCDMA system and the utilization rate of code resources. The technical solution is as follows:

1) Configure the 4B relative threshold Pth in the background.

2) Take the transmission format TFS={TF1, TF2, ..., TFn} corresponding to the current contract service type, where TBNumn is the number of transmission blocks corresponding to TFn.

3) The foreground calculates the 4B threshold set 4BS={4B1, 4B2,...,4Bn} according to the 4B relative threshold Pth obtained by the background, and the calculation formula is as follows:

${\mathrm{<span\; class="notranslate">\; 4</span>}\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; RTT</span>}}{\mathrm{<span\; class="notranslate">\; tti</span>}}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; TBNum</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; TBSize</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; Pth</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

In the formula, RTT is a value configured according to the network loopback time. Normally, it is set to 200ms, and tti is the scheduling period.

4) When the service is currently in a certain rate state, the system will select a suitable TFs according to the TFS corresponding to the service category, that is, the transmission format subset, which is a subset of the TFS set, where TFs={TF1,TF2,. .., TFm}, where 1<=m<=n, according to m, select the 4B threshold subset 4Bs corresponding to the current service state, which is a subset of the 4B threshold set 4BS, where 4Bs={4B1, 4B2, .. ., 4Bm}.

5) When the system detects that the current traffic occupancy BO<=4Bm-1, compare, if BO<=4Bm-j&&BO>4Bm-j-1, where j=1, 2,..., m-2 , then the rate is lowered by j levels, that is, the system adjusts the current TFs of the service to {TF1, TF2, ..., TFm-j}, so as to meet the needs of flexibly grasping the level of rate reduction according to the actual situation of the current traffic.

Below in conjunction with Fig. 2, the implementation of the technical solution is described in further detail:

1) Configure the 4B relative threshold Pth in the background of the system, and configure the 4B event reporting times threshold 4B CounterThold.

2) According to the current service contract type, take the corresponding service transmission format set TFS, where TFS={TF1, TF2,...,TFn}, calculate and obtain the corresponding 4B threshold set 4BS={4B1, 4B2,...,4Bn}.

3) Assuming that the current service rate is K bps, then the transmission format subset corresponding to the current service rate is TFs={TF1, TF2,...,TFm}, where 1<=m<=n.

4) According to the current TFs, obtain the current 4B threshold subset 4Bs={4B(1), 4B(2),...,4B(m)}, configure the current 4B event reporting counter array 4BCounter={4BCounter(1), 4BCounter(2), . . . , 4BCounter(m)}=0.

5) The trigger condition for the system to report a 4B event is BO<=4B(m-1). After the system reports a 4B event, the rate reduction level is determined according to the following process:

a) Set 4BCounter(m-1)=4BCounter(m-1)+1;

b) Detecting that BO is in the 4Bs set, the corresponding element j satisfies the condition 4B(j)>=BO>4B(j-1), j=1,...,m-1;

c) Updating the counter value 4BCounter(1)=4BCounter(1)+1, wherein, 1=j,...,m-1;

d) Detect the element 4BCounger(k) in the 4B event counter array 4BCounter, where k=1,...,m-1, find the smallest k value among 4BCounter(k)>=4BCounterThold, set it as K, and continue the steps e), otherwise jump to step 5);

e) Execute the DCH channel rate reduction process, the rate reduction series is m-K, and reset the 4BCounter array to 0, and jump to step 3).

According to the definition of 3GPP TS 25.331 protocol, the reporting of 4B events is controlled by two timers, Trigger Timer and Pending Timer. In the algorithm, the way Trigger Timer and Pending Timer control event triggering does not change, because in the algorithm flow, the triggering of events is controlled by 4B The last element 4B(m) in the threshold subset is triggered, and then the threshold level reached by the current trigger is counted. If K=m-1, then the down-regulation stops, and other channel migration procedures are transferred.

In addition, when reporting 4A events, all 4B counters need to be cleared and reset.

To sum up, this method can flexibly determine the level of rate reduction according to the current memory usage by adopting the DCH channel dynamic rate reduction algorithm, and effectively improves the performance of the WCDMA system and the utilization rate of code resources.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (11)

1. a method for modulating down special channel speed is characterized in that, may further comprise the steps:

Step S102, configuration 4B relative threshold;

Step S104 according to described 4B relative threshold, calculates all corresponding 4B threshold values of all transformats corresponding with present type of service;

Step S106, current business amount occupancy is during less than the pairing 4B threshold value of current transformat, described current business amount occupancy and the 4B threshold value that reduces transformat are one by one compared, when finding described current business amount occupancy less than the 4B threshold value that has reduced by j transformat and when having reduced the 4B threshold value of j+1 transformat, judgement is reduced the j level with speed.

2. method for modulating down special channel speed according to claim 1 is characterized in that, in step S104, according to the set TFS={TF1 of the transformat corresponding with all types of service, TF2 ..., TFn} calculates 4B threshold value set 4BS={4B1,4B2 ..., 4Bn}.

3. method for modulating down special channel speed according to claim 2, it is characterized in that, 4Bn=(RTT/tti) * (the transmission block number of TFn correspondence) * transport block size * 4B relative threshold, wherein, RTT is that tti is dispatching cycle according to the fixed value of Loop Round Trip Time configuration.

4. method for modulating down special channel speed according to claim 2 is characterized in that, in step S106, according to the present rate state, chooses current transmission format subset TFs={TF1, TF2 ..., TFm}, wherein, m＜=n, and choose 4B threshold value subclass 4Bs={4B 1, and 4B2 ..., 4Bm}.

5. method for modulating down special channel speed according to claim 4, it is characterized in that, described current business amount occupancy BO is during smaller or equal to 4Bm-1,4B threshold value among BO and the described 4B threshold value subclass 4Bs is compared, if 4Bm-j-1＜BO＜=4Bm-j then adjudicates speed is reduced the j level, described current transmission format subset TFs is adjusted into { TF1, TF2 ..., TFm-j}.

6. method for modulating down special channel speed according to claim 1 is characterized in that, in step S102, and configuration 4B reporting events frequency threshold value.

7. method for modulating down special channel speed according to claim 6 is characterized in that, in step S104, according to the set TFS={TF1 of the transformat corresponding with all types of service, TF2 ..., TFn} calculates 4B threshold value set 4BS={4B1,4B2, ..., 4Bn}, wherein, 4Bn=(RTT/tti) * (the transmission block number of TFn correspondence) * transport block size * 4B relative threshold, wherein, RTT is that tti is dispatching cycle according to the fixed value of Loop Round Trip Time configuration.

8. method for modulating down special channel speed according to claim 7 is characterized in that, in step S106, according to the present rate state, chooses current transmission format subset TFs={TF1, TF2 ..., TFm}, wherein, m＜=n, and choose 4B threshold value subclass 4Bs={4B1, and 4B2 ..., 4Bm}.

9. method for modulating down special channel speed according to claim 8 is characterized in that, disposes current 4B reporting events counter array 4BCounter={4BCounter (1), 4BCounter (2) ..., 4BCounter (m) }.

10. method for modulating down special channel speed according to claim 9 is characterized in that, determines speed downward modulation grade by following steps:

Step S202 as traffic carrying capacity occupancy BO during smaller or equal to 4Bm-1, reports the 4B incident, 4BCounter (1)=4BCounter (1)+1;

Step S204, the element j of detection BO correspondence in described 4B threshold value subclass 4Bs, described j satisfies 4Bj＞BO＞=4Bj-1;

Step S206,4BCounter (i)=4BCounter (i)+1, wherein, and i=j ..., m-1;

Step S208, detect the element 4BCounter (k) among the described 4B reporting events counter array 4BCounter, if there is 4BCounter (k)＞=4B reporting events frequency threshold value, maximizing K therein then, be judged to be speed downward modulation m-K level, with the described 4B reporting events counter array 4BCounter zero clearing that resets, described current transmission format subset TFs is adjusted into { TF1, TF2, ..., TFm-K} is back to step S106, otherwise is back to step S202.

11., it is characterized in that described method for modulating down special channel speed is applied to broadband CDMA system according to each described method for modulating down special channel speed in the claim 1 to 10.

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