CN100502271C - Calling admission control method of WCDMA access system - Google Patents
Calling admission control method of WCDMA access system Download PDFInfo
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- CN100502271C CN100502271C CNB031595235A CN03159523A CN100502271C CN 100502271 C CN100502271 C CN 100502271C CN B031595235 A CNB031595235 A CN B031595235A CN 03159523 A CN03159523 A CN 03159523A CN 100502271 C CN100502271 C CN 100502271C
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Abstract
The invention provides a calling admittance control method of the WCDMA system. The method includes the following steps: count users' accessing information, users' temporary information and new calling request information; when users have new calling request, first take the uses' new calling request information as users' temporary information and then as the users' accessing information after a preconcerted delay; when users' exit the system, delete users' accessing information after another preconcerted delay; and according to the users' accessing information, users' temporary information and new calling request information, decide whether admits the calling or not.
Description
Technical field
The present invention relates to wireless communication field, be specifically related to a kind of Wideband Code Division Multiple Access (WCDMA) and insert (WCDMA) system calling admittance control method.
Background technology
WCDMA is a kind of advanced in performance cell mobile communication systems.WCDMA system support broadband services, effective support circuit switched service is as PSTN (public switched telephone network), ISDN (integrated services digital network), packet switching service, as IP (Internet Protocol) net.Wireless protocols can be supported speech, data and multimedia service to same user simultaneously in a carrier wave flexibly.By transparent or non-transparent transmission piece support in real time, non-real-time service.Usually, for the communication quality that guarantees the existing subscriber, sub-district cover and the utilance of resource, take Admission Control (CAC) technology to come that new user is inserted in the sub-district and control.Mobile subscriber initiates new calling in a new sub-district or application is switched or increase a new business in an existing calling procedure or existing business is carried out all carrying out when channel is reshuffled access control.
Admission Control can come system load is estimated and predict by adopting the whole bag of tricks, to determine whether to insert call request.The load here can be the load factor of up-downgoing, can be the up power of always accepting, in the 3GPP agreement, it is called RTWP (total received power in broadband), it also can be descending total transmitting power, in the 3GPP agreement it being called TCP (emission carrier power), also can be other parameters.But in the load estimation process of access control, there is a problem, that is exactly that system is after permission inserts a call request, because of carrying out, system needs the regular hour, just there is system delay, this calling is not the system that just is access at once, and during this period of time system may produce a plurality of call requests, also has a plurality of user log offs certainly.If correctly the load variations situation of prognoses system may cause the congested generation of potential load so.
Issuable number of calls can be calculated as follows during the system delay:
At busy hour calling amount is N/ hour (being that average arrival rate is λ/second), measures and is spaced apart δ during second, and a probability that has n calling to arrive in measuring at interval is:
At N is 2700 o'clock, by calculating, can draw system delay as shown in the table inserts the different user number in the time of 2 seconds probability:
| Number of |
0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Probability (%) | 22.3130 | 33.4695 | 25.1021 | 12.5511 | 4.7067 | 1.4120 | 0.3530 | 0.0756 |
| Number of |
8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| Probability (%) | 0.0142 | 0.0024 | 0.0004 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
For the aforementioned calculation result, also available Fig. 1 inserts the probability of different user number when expressing system delay more intuitively and being 2 seconds.As can be seen, Yanzhong when 2 seconds system, the probability that inserts 1～6 user reaches 77.59%.
In concrete load estimation scheme, can use up, down load measurement report (RTWP, TCP etc.), existing subscriber's log-on message (data rate, type of service, demodulation threshold, pilot frequency intensity when inserting at random etc.), user's temporary information of connecting system (being similar to the content of existing subscriber's log-on message) does not carry out load estimation by access but as yet, but in forecasting process, do not take into full account the influence of system's time delay usually, so, exist under the situation of system delay, prediction and actual conditions to system load varies have bigger difference, the variation of estimating system load ideally, make the user that request is inserted accurately to control, might influence user's communications quality and utilization rate of network resource.
Summary of the invention
The objective of the invention is to overcome the above-mentioned shortcoming of prior art, provide a kind of Wideband Code Division Multiple Access (WCDMA) to insert (WCDMA) calling network admittance control method, it is characterized in that described method comprises:
A kind of bandwidth CDMA access system call admission control method is characterized in that described method comprises:
When the new call request of user, this user's new call request information is saved as user's temporary information;
Holding time as user's temporary information arrives predetermined delay time, and described user's temporary information is saved as user login information;
The time of withdrawing from described system as the user arrives another predetermined delay time, deletes this user's log-on message;
Up-to-date user login information, user's temporary information and new call request information after statistical time lag;
According to user login information up-to-date after the described statistical time lag, user's temporary information and new call request information prediction load;
Determine according to described prediction load result whether access is called out.
This method comprises that also system carries out initialized operation, and this operation comprises:
The user login information storage area is set, to deposit the actual user profile that inserts described system;
User's temporary information storage area is set, to deposit but the actual as yet user profile that inserts described system by access;
The step of up-to-date user login information, user's temporary information and new call request information comprises after the described statistical time lag:
According to the described user login information of the information acquisition of described user login information storage area;
According to the described user's temporary information of the information acquisition of described user's temporary information storage area.
Especially, described method also comprises:
Set the dissimilar of all-calls request;
Be respectively described dissimilar call request and set corresponding delay time.
Described when the new call request of user, this user's new call request information is saved as user's temporary information; Holding time as user's temporary information arrives predetermined delay time, and the step that described user's temporary information is saved as user login information comprises step:
When the new call request of user, deposit the new call request information of described user in described user's temporary information storage area;
According to described user's call request type, postpone behind the delay time of correspondence of described setting the new call request information of described user from the unloading of described user's temporary information storage area to described user login information storage area.
The dissimilar step of described setting all-calls request comprises: set dissimilar the comprising of all-calls request: newly insert call request, reshuffle call request, handover call request.
Describedly be respectively the step that described dissimilar call request is provided with corresponding delay time and comprise:
Be respectively described dissimilar call request corresponding timer is set;
The length of setting the timer of described correspondence respectively is the delay time of the dissimilar call request correspondence of described setting.
Described call request type according to described user postpones behind the delay time of correspondence of described setting the step of the new call request information of described user from the unloading of described user's temporary information storage area to described user login information storage area to be comprised:
Start the timer of described user's call request correspondence;
Behind the timer expiry of described user's call request correspondence, with the new call request information of described user from the unloading of described user's temporary information storage area to described user login information storage area.
The described time of withdrawing from described system as the user arrives another predetermined delay time, and the step of deleting this user's log-on message comprises:
Set user log off indication timer;
The length of setting described user log off indication timer is another scheduled time;
When withdrawing from described system, the user starts described user log off indication timer;
Behind described user log off indication timer expiry, delete the log-on message of user described in the described user login information storage area.
Describedly determine the step whether access is called out to comprise step according to the up-to-date user login information in described time-delay back, user's temporary information and new call request information:
According to user login information assessment load measure report up-to-date after the described statistical time lag;
According to user login information up-to-date after the described statistical time lag, user's temporary information and new call request information prediction load;
Determine according to described prediction load result whether access is called out.
Described user login information, user's temporary information and new call request information comprise: data rate, type of service, demodulation threshold and/or the pilot frequency intensity when inserting at random.
Utilize the present invention, the resolution system time-delay improves the accuracy of load estimation to the influence of access control load prediction effect well, reduces the probability of happening of load congestion phenomenon, guarantees the stability of Radio Access Network.
Description of drawings
Fig. 1 is the probability distribution block diagram that the WCDMA system delay inserts the different user number when being 2 seconds;
Fig. 2 is the flow chart of step of the preferred embodiment WCDMA system calling admittance control method of the inventive method.
Embodiment
In order to make those skilled in the art person understand the present invention better, the present invention is described in further detail below in conjunction with drawings and embodiments.
With reference to Fig. 2, Fig. 2 shows the flow process of step of the preferred embodiment WCDMA system calling admittance control method of the inventive method:
Step 201: system carries out initialization.Can be the initial start of system this moment, just do not have the user to begin from system; After can being meant that also the renewal of last user log-on message is finished.System initialization comprises: the user login information storage area is set, to deposit the actual user profile that inserts this system; User's temporary information storage area is set, to deposit but the actual as yet user profile that inserts this system by access.System initialization also comprises: set the dissimilar of all-calls request, such as, the system calling request can be divided into three types: newly insert call request, reshuffle call request, handover call request; Be respectively described dissimilar call request corresponding timer is set, such as, be set at respectively: newly insert timer, reshuffle timer, switching timer; And the time-out time of setting corresponding timer respectively is the delay time of the dissimilar call request of correspondence, such as, be respectively: τ
New, τ
Reconfig, τ
HO, according to system's actual needs, τ
New, τ
Reconfig, τ
HOCan be identical, also can be different.System initialization also comprises: set user log off indication timer; And the time-out time of setting this user log off indication timer is another scheduled time, such as, be τ
Exit
Step 202: judge to have or not timer to start, comprise timer τ new, the τ of new call request correspondence
Reconfig, τ
HOWith user log off indication timer τ
ExitIf any, then enter step 203; As do not have, then go to step 204.
Step 203: judge to have or not timer expiry, judge promptly whether the actual timing length of timer surpasses predefined timer length.The timer and the user log off indication timer that comprise above-mentioned new call request correspondence equally.If any, then go to step 211; As do not have, then enter step 204.
Step 204: judging has no user to withdraw from.If any, then go to step 209; As do not have, then enter step 205.
Step 205: judging has the new call request of no user, comprising: newly insert call request, reshuffle call request, handover call request.If any, then enter step 206; As do not have, then return step 202.
Step 206: use up-to-date measurement report, user profile (temporary information that comprises existing subscriber's the unactual access user of log-on message Buddhist monk), prediction inserts the system load of call request.Described load is used to weigh the operating position of air interface resource.Be specially: according to the information acquisition user login information of described log-on message storage area; Information acquisition user temporary information according to user's temporary information storage area.According to the report of user login information assessment load measure; According to user login information, user's temporary information and new call request information prediction load.
Step 207: whether the prediction load value surpasses corresponding access thresholding.If surpass, then return step 202; If do not surpass, then enter step 208.
Step 208: permit customer call and insert.
Step 209: start corresponding timer, comprising: newly insert timer τ
New, reshuffle timer τ
Reconfig, switching timer τ
HO, and user log off indication timer T
Exit
Step 210: preserve user's temporary information, be about to the new call information of user and deposit user's temporary information storage area in.
Step 211: updating user login information.Described updating user login information comprises: (comprise τ if any the new call request of user (comprise above-mentioned new access call request, reshuffle call request, handover call request) timer
New, τ
Reconfig, τ
HO) overtime, then this user with correspondence deposits the call request information unloading of above-mentioned user's temporary information storage area in to the user login information storage area; As user log off indication timer τ
ExitOvertime, then delete this user's who preserves in the user login information storage area log-on message.
In the step of the invention described above method, taken into full account system's time delay, just make decision the time that this decision exists in the middle of being performed, to the influence of the load estimation in the access control from system.In the present invention, do not pay close attention to concrete load estimation and the prediction scheme that is adopted in the Admission Control process.Such as, in concrete load estimation scheme, can use up, down load measurement report (RTWP, TCP etc.), existing subscriber's log-on message (data rate, type of service, demodulation threshold, the pilot frequency intensity when inserting at random etc.), user's temporary information of connecting system does not carry out load estimation by access but as yet.No matter adopt which kind of load estimation and prediction scheme, as long as considered the influence that system's time delay is estimated and predicted the outcome load, spirit promptly according to the invention.
Equally, though among the embodiment of the present invention user profile is divided into user login information and user's temporary information, the present invention is not limited to this division methods, also can adopt other division methods, same spirit according to the invention.
Though embodiment described in the invention has used new call request timer (to comprise new access call request timer τ
New, reshuffle call request timer τ
Reconfig, handover call request timer τ
HO) and user log off indication timer τ
Exit, the present invention is changed slightly, also can use the timer of heterogeneity, different title, different numbers.Certainly, if needed, also can be respectively circuit domain business and packet switch domain service different timers and parameter thereof are set respectively.As long as used global design thought of the present invention, spirit promptly according to the invention.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (10)
1, a kind of WCDMA access system call admission control method is characterized in that, described method comprises:
When the new call request of user, this user's new call request information is saved as user's temporary information;
Holding time as user's temporary information arrives predetermined delay time, and described user's temporary information is saved as user login information;
The time of withdrawing from described system as the user arrives another predetermined delay time, deletes this user's log-on message;
Up-to-date user login information, user's temporary information and new call request information after statistical time lag;
According to user login information up-to-date after the described statistical time lag, user's temporary information and new call request information prediction load;
Determine according to described prediction load result whether access is called out.
2, the method for claim 1 is characterized in that, this method comprises that also system carries out initialized operation, and this operation comprises:
The user login information storage area is set, to deposit the actual user profile that inserts described system;
User's temporary information storage area is set, to deposit but the actual as yet user profile that inserts described system by access;
The step of up-to-date user login information, user's temporary information and new call request information comprises after the described statistical time lag:
According to the described user login information of the information acquisition of described user login information storage area;
According to the described user's temporary information of the information acquisition of described user's temporary information storage area.
3, method as claimed in claim 2 is characterized in that, also comprises:
Set the dissimilar of all-calls request;
Be respectively described dissimilar call request and set corresponding delay time.
4, method as claimed in claim 3 is characterized in that, and is described when the new call request of user, and this user's new call request information is saved as user's temporary information; Holding time as user's temporary information arrives predetermined delay time, and the step that described user's temporary information is saved as user login information comprises step:
When the new call request of user, deposit the new call request information of described user in described user's temporary information storage area;
According to described user's call request type, postpone behind the delay time of correspondence of described setting the new call request information of described user from the unloading of described user's temporary information storage area to described user login information storage area.
5, method as claimed in claim 4 is characterized in that, the dissimilar step of described setting all-calls request comprises: set dissimilar the comprising of all-calls request: newly insert call request, reshuffle call request, handover call request.
6, method as claimed in claim 4 is characterized in that, describedly is respectively the step that described dissimilar call request is provided with corresponding delay time and comprises:
Be respectively described dissimilar call request corresponding timer is set;
The length of setting the timer of described correspondence respectively is the delay time of the dissimilar call request correspondence of described setting.
7, method as claimed in claim 6, it is characterized in that, described call request type according to described user postpones behind the delay time of correspondence of described setting the step of the new call request information of described user from the unloading of described user's temporary information storage area to described user login information storage area to be comprised:
Start the timer of described user's call request correspondence;
Behind the timer expiry of described user's call request correspondence, with the new call request information of described user from the unloading of described user's temporary information storage area to described user login information storage area.
8, method as claimed in claim 2 is characterized in that, the described time of withdrawing from described system as the user arrives another predetermined delay time, and the step of deleting this user's log-on message comprises:
Set user log off indication timer;
The length of setting described user log off indication timer is another scheduled time;
When withdrawing from described system, the user starts described user log off indication timer;
Behind described user log off indication timer expiry, delete the log-on message of user described in the described user login information storage area.
9, the method for claim 1 is characterized in that, and is described according to user login information up-to-date after the described statistical time lag, user's temporary information and new call request information prediction load; Determine the step whether access is called out to comprise step according to described prediction load result:
According to user login information assessment load measure report up-to-date after the described statistical time lag;
According to user login information up-to-date after the described statistical time lag, user's temporary information and new call request information prediction load;
Determine according to described prediction load result whether access is called out.
10, the method for claim 1 is characterized in that, described user login information, user's temporary information and new call request information comprise: data rate, type of service, demodulation threshold and/or the pilot frequency intensity when inserting at random.
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| US6515964B1 (en) * | 1998-12-29 | 2003-02-04 | At&T Corp. | Method and apparatus for dynamically controlling the admission of calls to a network |
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