CN1710902A - An Admission Control Method Using Negotiation Mechanism - Google Patents

Abstract

Method includes steps: (1) RNC accepts request for admittance of new service; (2) determining whether load level in current sub zone is lower than target value of load; if yes, executing step (3); if no, and there is controllable service or new service is controllable, then executing step (4); if no, and both of the existed services and new service is not controllable, then admittance is refused; (3) determining whether current sub zone is able to accept the new service; if yes, accepting admittance; if no, and there is controllable service in existed services or new service is controllable; then executing steps (4); if no, and both of existed services and new service is not controllable, then admittance is refused; (4) defining speed readjustment plan, and determining whether new service is acceptable after adjustment; if yes, according to the plan, adjusting speed of service, and accepting admittance; otherwise admittance is refused. Features are: taking full advantage of resources.

Description

An Admission Control Method Using Negotiation Mechanism

technical field

The invention relates to admission control technology, in particular to an admission control method using a negotiation mechanism.

Background technique

The Wideband Code Division Multiple Access (WCDMA) system is a cellular mobile communication system with advanced performance. The base station controller (RNC) is the control core of the radio resource management of the WCDMA system, and manages and dispatches the radio resources of the entire system.

Among them, the power resource of the air interface is one of very important wireless resources. In the WCDMA system, when a new service is admitted, for the uplink, the total interference level received by the system, that is, the total received wideband power (RTWP) will increase; for the downlink, the downlink transmission of the base station Power, that is, carrier transmit power (TCP) will also increase. In an overloaded system, the increase of RTWP or TCP may lead to the decline of call quality, and in severe cases, it may cause large-scale call drop.

At present, in order to ensure the communication quality of original services in the system, cell coverage, and resource utilization, the RNC has adopted certain admission control techniques to control cell access services. When a mobile user initiates a new call or applies for handover in a new cell, or adds a new service during an existing call, or reconfigures the channel for an existing service, the RNC must perform pre-configuration into control. In a WCDMA system, admission control is performed separately in the uplink and downlink, that is to say, the entire admission control is divided into two parts: uplink admission control and downlink admission control, only uplink and downlink The RNC can only accept the new service when all the admission controls determine that the new service can be accessed. However, the existing technology adopts a "comparison" method when performing uplink or downlink admission control. The existing schemes usually have the following types: 1. Set the threshold of the number of users, and access new users under the condition that the number of users does not exceed the threshold; otherwise, refuse to access new users; load level, and then compare the estimated value of the load level with the load threshold set in advance, if the load threshold is not exceeded, the admission request is accepted; otherwise, the admission request is rejected; for example, the total downlink transmission power threshold of the base station is set, Obtain the current downlink transmission power of the base station, and sum the downlink transmission power with the estimated power value set for the new service applying for admission. If the obtained power sum is less than the total downlink transmission power threshold of the base station, access the new service, otherwise Reject access to new services; 3. Set other thresholds for comparison according to management needs to decide whether to access new services.

Because, in the WCDMA system, according to the service performance requirements of the business, the business can be divided into real-time and non-real-time business; according to the controllability of the load caused by the business, the business can also be divided into controllable and uncontrollable business. . Controllable services refer to those services that are not sensitive to delay, that is, non-real-time services, such as: packet services and adaptive multi-rate (AMR) voice services, etc.; uncontrollable services refer to those that are sensitive to delay and have rate Or the minimum rate-limited service, that is, the real-time service, such as: the minimum rate AMR voice service, etc. Among them, the load generated by the controllable service is the controllable load, and the load generated by the uncontrollable service is the uncontrollable load, so the cell load is composed of two parts: the controllable load and the uncontrollable load. Therefore, both the existing services of the system and the services requesting access may be controllable services, and the loads generated by them may also be controllable loads. In this way, for these controllable services, the system can not only control the access of these controllable services by means of comparison, but also adjust the rate of controllable services, that is, perform service negotiation, to control the access of new services, thereby Maximize system capacity and make full use of wireless resources.

However, none of the existing admission control schemes considers the service negotiation of the controllable services, and only uses an absolute "comparison" method to control the access of new services, so that some new services that could have been accessed through service negotiation are also unavailable. Therefore, the existing technical solutions cannot make full use of system resources for admission control.

Contents of the invention

In view of this, the main purpose of the present invention is to provide an admission control method using a negotiation mechanism, so that when the RNC performs admission control, it can conduct business negotiation on the existing controllable services of the system and the new services applying for admission, Thus, the system capacity is maximized and the radio resources of the system are fully utilized.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

The invention discloses an admission control method using a negotiation mechanism, the main processing steps of which are as follows:

a. After the RNC receives the admission request of the new service, it obtains the new service type according to the service performance requirements of the new service in the admission request, obtains the load measurement value of the currently accessed cell and analyzes the composition of the current existing service, and obtains The load level of the current cell and the existing business conditions of the current cell;

b. judge whether the current cell load level is lower than the cell load target value, if the current cell load level is lower than the cell load target value, then perform step c; if the current cell load level is higher than the cell load target value, and there are existing services If the controllable business or the new business is a controllable business, then execute step d; if the current cell load level is higher than the cell load target value, and both the existing business and the new business are uncontrollable business, then reject the admission request and end the admission process. access control;

c. Judging whether the current cell can access the new service, if it can access the new service, accept the admission request and end the admission control; if it cannot access the new service, and there are controllable services or new services in the existing services If the service is a controllable service, execute step d; if the new service cannot be accessed, and both the existing service and the new service are uncontrollable services, reject the access request and end the access control;

d. According to the current existing business situation and new business type, determine the rate adjustment plan for the controllable business in the existing business, or the controllable new business, or the combination of the two, and judge whether the current cell can adjust the rate according to the plan. To access new services, if possible, adjust the rate according to the rate adjustment plan, accept the admission request, and end the admission control; otherwise reject the admission request, and end the admission control.

In step c, the method for judging whether the current cell can access new services is:

Estimate the cell load level after accessing the new service, and then judge whether the estimated cell load level is higher than the cell load target value, if yes, the current cell cannot access the new service; otherwise, the current cell can access the new service.

In step c, the method for judging whether the current cell can access new services is:

Estimate the current system available bandwidth, and then judge whether the estimated system available bandwidth is less than the request rate of the new service. If yes, the current cell cannot access the new service; otherwise, the current cell can access the new service.

Among them, when there is no controllable business in the current existing business and the new business is a controllable business, in step d,

The determining rate adjustment scheme specifically includes: estimating the current system available bandwidth, and setting the access rate of the new service to the estimated system available bandwidth;

The method for judging whether the cell can access the new service is: judging whether the estimated system available bandwidth is less than the minimum rate of the new service, if yes, the current cell cannot access the new service; otherwise the current cell can access the new service new business;

The adjusting the rate according to the rate adjustment scheme specifically includes: configuring the estimated system available bandwidth as the access rate for the new service.

Among them, when there is no controllable business in the current existing business and the new business is a controllable business, in step d,

The determining rate adjustment scheme is specifically: setting the access rate of the new service to the system available bandwidth estimated in step c;

The method for judging whether the sub-district can access the new service is: whether the system available bandwidth estimated by step c is less than the minimum rate of the new service, if yes, the current sub-district cannot access the new service; otherwise the current sub-district can receive enter into the new business;

The adjusting the rate according to the rate adjustment scheme specifically includes: configuring the estimated system available bandwidth as the access rate for the new service.

Among them, when there are controllable services in the current existing services and the new services are uncontrollable services, in step d,

The determining rate adjustment scheme specifically includes: setting the rate of existing controllable services;

The method for judging whether the cell can access the new service is: estimating the available bandwidth of the system after adjusting the rate of the existing controllable service according to the rate adjustment scheme, and then judging whether the estimated available bandwidth of the system is less than the request rate of the new service, If yes, the current cell cannot access the new service; otherwise, the current cell can access the new service; or,

Estimate the load level of the cell after adjusting the existing controllable service rate according to the rate adjustment scheme, and then access the new service, and then judge whether the estimated load level is higher than the load target value, if so, the current cell cannot access the new service ; Otherwise, the current cell can access the new service;

The adjusting the rate according to the rate adjustment scheme specifically includes: adjusting the rate of the existing controllable service according to the rate adjustment scheme.

Among them, when there is a controllable business in the current existing business and the new business is a controllable business, in step d,

The determination of the rate adjustment scheme is specifically: setting the rate of the existing controllable business, estimating the available bandwidth of the system after adjusting the rate of the existing controllable business according to the rate adjustment scheme, and setting the access rate of the new business to the estimated System available bandwidth;

The method for judging whether the cell can access the new service is: judging whether the estimated system available bandwidth is less than the minimum rate of the new service, if yes, the current cell cannot access the new service; otherwise, the current cell can access the new service new business;

The adjusting the rate according to the rate adjustment scheme specifically includes: adjusting the rate of the existing controllable service according to the rate adjustment scheme, and configuring the estimated system available bandwidth as the access rate for the new service.

Among them, when there is a controllable business in the current existing business and the new business is a controllable business, in step d,

The determination of the rate adjustment scheme specifically includes: setting the rates of existing controllable services and new services;

The method for judging whether the cell can access the new service is as follows: estimate the load level of the cell that accesses the new service after adjusting the rate of the existing controllable service and the new service according to the rate adjustment plan, and then judge whether the estimated load level is is higher than the load target value, if yes, the current cell cannot access the new service; otherwise, the current cell can access the new service;

The adjusting the rate according to the rate adjustment scheme specifically includes: adjusting the rate of the existing controllable service according to the rate adjustment scheme, and configuring the new service rate set in the rate adjustment scheme as the access rate for the new service.

Wherein, when there is a controllable service in the current existing service and the new service is a controllable service, in step c, before performing step d, it further includes: estimating the current system available bandwidth, and judging the estimated system bandwidth in step c Whether the available bandwidth is less than the minimum rate of the new service, if yes, execute step d; otherwise configure the estimated system available bandwidth as the access rate for the new service, accept the admission request, and end the admission control.

Wherein, when there is a controllable service in the current existing service and the new service is a controllable service, in step c, before performing step d, it further includes: judging whether the estimated system available bandwidth in step c is less than the minimum bandwidth of the new service rate, if yes, execute step d; otherwise, configure the estimated system available bandwidth as the access rate for new services, accept the admission request, and end the admission control.

Wherein, when there are controllable services in the current existing services, in step d, before denying the admission request, it further includes: judging whether all existing controllable service rates have been set to their respective rates in the rate adjustment scheme Minimum rate, if yes, reject the admission request; otherwise, re-execute step d.

Wherein, when there is a controllable service in the current existing service and the new service is a controllable service, in step d, before denying the admission request, it further includes: judging whether all existing controllable services have been transferred in the rate adjustment scheme. The service and new service rates are set to their respective minimum rates, if yes, reject the admission request; otherwise, re-execute step d.

Wherein, when there is a controllable service in the current existing service and the new service is a controllable service, before denying the admission request, it further includes: judging whether the minimum rate of the new service is 0, and if so, configuring the rate of 0 for the new service as Access rate, accept the admission request; otherwise reject the admission request.

Wherein, when the current admission request is an admission request for intra-frequency handover, in step d, after it is judged that the new service can be accessed, the processing step is: put forward a suggestion for reconfiguring the rate of the new service to the estimated available bandwidth of the system , the new service reconfigures its own access rate to the available bandwidth of the system according to the proposed suggestion, and re-initiates the admission request, and returns to step a.

Wherein, when the current access request is an access request for intra-frequency handover, in step d, after it is judged that the new service can be accessed, the processing step is: adjust the rate of the existing controllable service according to the rate adjustment scheme, and the rate of the new service is The service proposes to reconfigure the access rate to the new service rate set in the rate adjustment plan, and the new service reconfigures its own access rate to the new service rate set in the rate adjustment plan according to the proposal , and re-initiate the admission request, and return to step a.

Wherein, after the determination that the minimum rate of the new service is 0, the processing steps are: put forward a suggestion for the new service to reconfigure the access rate to 0 rate, and the new service reconfigures its own access rate to 0 rate according to the proposed suggestion , and re-initiate the admission request, and return to step a.

As can be seen from the above scheme, the key of the present invention is: when the RNC judges that the new service cannot be accessed at the requested rate, the admission request is not directly rejected, but the service negotiation is carried out, that is, the available service in the existing service is set. Controlled business, or controllable new business, or a rate adjustment scheme based on the combination of the two, and then based on this rate adjustment scheme, judge the rate adjustment scheme by estimating the load level of the new service access cell or the available bandwidth of the system Whether the new service can be accessed after adjusting the rate of the controllable service in the existing service, or the controllable new service, or the combination of the two, so as to decide whether to accept the admission request.

Therefore, the admission control method using the negotiation mechanism provided by the present invention can make full use of the service performance requirements of the controllable business, and provide a complete set of admission policies considering business negotiation, so as to make better use of system resources and make the system Maximize capacity.

Description of drawings

Fig. 1 is a schematic diagram of the processing flow of a preferred embodiment of the admission control of case 1 by the method of the present invention;

Fig. 2 is a schematic diagram of the processing flow of a preferred embodiment of the admission control of the present invention to the second situation;

Fig. 3 is a schematic diagram of the processing flow of a preferred embodiment of the access control of the present invention to the third case;

Fig. 4 is a schematic diagram of a processing flow diagram of a preferred embodiment of the admission control of the present invention to situation 4;

Fig. 5 is a schematic diagram of a processing flow diagram of a preferred embodiment of the access control of the present invention to situation 6;

Fig. 6 is a schematic diagram of a processing flow diagram of a preferred embodiment of the access control of the present invention to the case seven;

Fig. 7 is a schematic diagram of a processing flow of a preferred embodiment of the admission control of the method of the present invention for the eighth situation.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

In the method of the present invention, the new business type applying for admission is divided into: controllable business and uncontrollable business; the existing business situation of the current cell is divided into: no controllable business and controllable business; the target load value of the cell is set And the current cell load level is divided into: the cell load is higher than the load target value and the cell load is lower than the load target value. In the following embodiments, in the new service, the controllable service is represented as C, and the uncontrollable service is represented as NC; in the existing service situation of the current cell, no controllable service is represented as CSN, and controllable service is represented as CSI; In the current cell load level, the cell load higher than the load target value is represented as H, and the cell load lower than the load target value is represented as L.

According to the provisions of the above-mentioned method of the present invention, admission control can be divided into the following eight situations:

Scenario 1: The load level of the current cell is L, the existing service status of the current cell is CSN, and the new service type is NC.

Scenario 2: The load level of the current cell is L, the existing service status of the current cell is CSN, and the new service type is C.

Scenario 3: The load level of the current cell is L, the existing service status of the current cell is CSI, and the new service type is NC.

Situation 4: The load level of the current cell is L, the existing service status of the current cell is CSI, and the new service type is C.

Scenario 5: The load level of the current cell is H, the existing service status of the current cell is CSN, and the new service type is NC.

Situation 6: The current cell load level is H, the existing service status of the current cell is CSN, and the new service type is C.

Scenario 7: The load level of the current cell is H, the existing service status of the current cell is CSI, and the new service type is C.

Scenario 8: The load level of the current cell is H, the existing service status of the current cell is CSI, and the new service type is NC.

In the method of the present invention, the system pre-sets the load target value for each cell, and when the RNC receives the admission request of the new service, the main processing steps are as follows:

a. After the RNC receives the admission request of the new service, it obtains the new service type according to the service performance requirements of the new service in the admission request, obtains the load measurement value of the currently accessed cell and analyzes the composition of the current existing service, and obtains The load level of the current cell and the existing business conditions of the current cell;

b. judge whether the current cell load level is lower than the cell load target value, if the current cell load level is lower than the cell load target value, then perform step c; if the current cell load level is higher than the cell load target value, and there are existing services If the controllable business or the new business is a controllable business, then execute step d; if the current cell load level is higher than the cell load target value, and both the existing business and the new business are uncontrollable business, then reject the admission request and end the admission process. access control;

c. Judging whether the current cell can access the new service, if it can access the new service, accept the admission request and end the admission control; if it cannot access the new service, and there are controllable services or new services in the existing services If the service is controllable, go to step d; if the new service cannot be accessed, and both the existing service and the new service are uncontrollable, reject the admission request and end the admission control.

d. According to the current existing business situation and new business type, determine the rate adjustment plan for the controllable business in the existing business, or the controllable new business, or the combination of the two, and judge whether the current cell can adjust the rate according to the plan. To access new services, if possible, adjust the rate according to the rate adjustment plan, accept the admission request, and end the admission control; otherwise reject the admission request, and end the admission control.

Based on the main processing steps of the method above, the admission control of the eight situations will be described below in conjunction with the accompanying drawings.

For scenario 1: the current cell load level is L, the existing service status of the current cell is CSN, and the new service type is NC, the system uses a one-time comparison method to determine whether the new service can be accessed at the requested rate, so as to decide whether to access new business. FIG. 1 is a schematic diagram of a processing flow of a preferred embodiment of the admission control of the method of the present invention for scenario 1. As shown in Figure 1, the specific processing steps are as follows:

Step 101: The RNC estimates the load level of the entire cell after admitting the new service according to the current cell load measurement value, the request rate and the service type in the new service performance requirements.

Among them, in the method of the present invention, the base station measurement value of the total uplink interference of the cell or the total downlink transmission power can be used as the load of the cell, and the load factor of the service throughput rate or the demodulation capability of the device can also be used as the definition of the load, but it is not limited to the above definition , also includes new load definitions that may be used for correlation analysis in future technological developments; when estimating the load level of a cell after a new service is accessed, if the new service request is due to a correlation algorithm that increases the rate of a link from low to low If it is generated, subtract the existing load of the link from the current cell load, and then estimate the load level of the entire cell after accessing the new service based on the request rate of the new service.

In addition, in the present invention, the method for estimating the cell load, the load measurement index used, and the specific scheme for converting the load measurement value into a load index are not limited to one, and different load estimation methods, load measurement indicators and The scheme of converting the load measurement value into the load index, because the load estimation method, the load measurement index and the scheme of converting the load measurement value into the load index are not the focus of the present invention, so it will not be described in detail here.

Step 102: Judging whether the estimated load level of the cell obtained in step 101 is greater than the target load value of the cell, if yes, go to step 103; otherwise, go to step 104.

Step 103: reject the admission request, and end the admission control.

Step 104: accept the admission request, and end the admission control.

Because the so-called system available bandwidth is to use the current load level measurement results, the service type and other parameters in the service performance requirements of the new service to calculate the maximum rate that the new service can use under the limitation of the cell load target value. Therefore, it is also possible to estimate the available bandwidth of the system after accessing the new service to perform admission control, then the above steps 101 and 102 are correspondingly changed to:

Step 101: RNC calculates the available bandwidth of the current system according to parameters such as the current load level measurement result and the service type in the new service performance requirement; Step 102: judge whether the system available bandwidth estimated in step 101 is less than the new service service performance requirement If so, go to step 103; otherwise go to step 104; here, the specific method of estimating the available bandwidth of the system is not the focus of the present invention, so it will not be described in detail.

For scenario 2: the current cell load level is L, the existing service status of the current cell is CSN, and the new service type is C, the system first judges whether the new service can be accessed at the requested rate, and if so, accepts the access request; otherwise , to determine the rate adjustment scheme of the new service, that is: set the access rate of the new service to the estimated system available bandwidth, and then judge whether the new service can access the cell with the system available bandwidth, so as to decide whether to use the system available bandwidth to access The new service still rejects the admission request. FIG. 2 is a schematic diagram of a processing flow of a preferred embodiment of the admission control of the method of the present invention for the second case. As shown in Figure 2, the specific processing steps are as follows:

Step 201: RNC estimates the load level of the whole cell after admitting the new service according to the current cell load measurement value and the request rate and service type in the service performance requirement of the new service.

Step 202: Judging whether the estimated value of the load level of the cell obtained in step 201 is greater than the target load value of the cell, if yes, execute step 203; otherwise, execute step 207.

Step 203: The system estimates the available bandwidth of the system after admitting the new service according to the service type in the current cell load measurement value and the service performance requirement of the new service, and determines the rate adjustment scheme of the new service, that is, the access rate of the new service is set to Estimated system bandwidth available.

For example: when the base station measurement value of the downlink carrier transmission power is used as the cell load measurement value, if the current carrier transmission power is 75%, the new service is an AMR voice service, and the current cell load threshold, that is, the carrier transmission power threshold is 80%, then you can It is estimated that the current supported rate is 10kbps, therefore, the available bandwidth of the current system is 10kb.

Step 204: Judging whether the system available bandwidth estimated in step 203 is less than the minimum rate requirement in the service performance requirements of the new business, if yes, go to step 205; otherwise, go to step 206.

Step 205: reject the admission request of the new service, and end the admission control.

Step 206: configure the available bandwidth estimated in step 203 as the access rate of the new service.

Since the available bandwidth of the system is estimated under a certain system load threshold limit, accessing new services with the available bandwidth, that is, the estimated available rate, will not cause the load of the cell to exceed the standard.

Wherein, the method of the present invention does not modify the maximum rate in the service performance requirement of the new service when configuring the available rate for the new service, and the rate configuration of the new service can be completed through basic resource configuration.

Step 207: Accept the admission request of the new service, and end the admission control.

In addition, here it is also possible to first estimate the available bandwidth of the system after accessing the new service, then the above steps 201 to 204 are correspondingly changed to:

Step 201: RNC calculates the available bandwidth of the current system according to parameters such as the current load level measurement result and the service type in the new service performance requirement; Step 202: judge whether the system available bandwidth estimated in step 201 is less than the new service service performance requirement Otherwise, turn to step 207; step 203 cancels; step 204: judge whether the system available bandwidth estimated in step 201 is less than the minimum rate in the new business service performance requirement, if yes, turn to Go to step 205; otherwise go to step 206.

For scenario 3: the current cell load level is L, the existing service status of the current cell is CSI, and the new service type is NC, the system first judges whether the new service can be accessed at the requested rate, and if so, accepts the access request; otherwise , determine the existing controllable service rate adjustment scheme, and then decide whether to access new services based on this rate adjustment scheme, so as to decide whether to adjust the rate of existing controllable services according to this rate adjustment scheme to access new services Or deny the access request. FIG. 3 is a schematic diagram of a processing flow of a preferred embodiment of the admission control of the method of the present invention for the third case. As shown in Figure 3, the specific processing steps are as follows:

Step 301: RNC estimates the load level of the whole cell after admitting the new service according to the current cell load measurement value and the request rate and service type in the service performance requirement of the new service.

Step 302: Judging whether the estimated load level of the cell obtained in step 301 is greater than the target load value of the cell, if yes, go to step 303; otherwise, go to step 308.

Wherein, the processing of step 301 and step 302 may also be:

Step 301: RNC calculates the available bandwidth of the current system according to parameters such as the current load level measurement result and the service type in the new business service performance requirement; Step 302: Judging whether the system available bandwidth estimated in step 301 is less than the new business service performance requirement If yes, go to step 303; otherwise go to step 308.

Step 303: Determine the existing controllable service rate adjustment scheme of the cell.

Here, the rate adjustment scheme is set by the RNC according to the service performance requirements of the existing controllable services in the cell, and can be set to reduce the rate of all existing controllable services by one or several levels until reduced to The minimum rate specified by their respective service performance requirements can also be set to reduce the rate of some existing services by one or several grades until it is reduced to the minimum rate specified by their respective service performance requirements.

Step 304: Estimate the load level of the entire cell after adjusting the rate of existing controllable services and accessing new services according to the rate adjustment scheme determined in step 303. Here, the request rate in the new business service performance requirements is used when estimating the load level.

Step 305: Judging whether the estimated value of the load level of the cell obtained in step 304 is greater than the target load value of the cell, if yes, go to step 306; otherwise, go to step 307.

Wherein, the processing of the above step 304 and step 305 may also be:

Step 304: On the basis of the rate adjustment scheme set in step 303, the RNC calculates the available bandwidth of the current system according to parameters such as the current load level measurement result and the service type in the new business service performance requirement; Whether the estimated system available bandwidth is less than the request rate in the service performance requirement of the new business, if yes, go to step 306; otherwise, go to step 307.

Step 306: reject the admission request of the new service, and end the admission control.

Step 307: Adjust the rate of the existing controllable services in the cell according to the rate adjustment scheme determined in step 303. Here, when adjusting the rate of an existing service, a solution of dynamic channel configuration can be used to complete it, but which solution is specifically adopted for rate adjustment is not limited in the present invention, and does not affect the effectiveness of the present invention.

Step 308: Accept the admission request of the new service, and end the admission control.

In addition, according to actual system design requirements, if the system requires as many access services as possible, step 306' may be further included before step 306: judging whether all existing controllable service rates have been set in the determined rate adjustment scheme. Set as their respective minimum rates, if yes, execute step 306; otherwise return to step 303; then, in step 303, the RNC will re-determine the rate adjustment scheme. In this way, the system can access new services as much as possible by repeatedly adjusting the rate of existing controllable services.

For scenario 4: the current cell load level is L, the existing service status of the current cell is CSI, and the new service type is C, the system first judges whether the new service can be accessed at the requested rate, and if so, accepts the access request; otherwise , determine the rate adjustment scheme for new services and existing controllable services, and then determine whether new services can be accessed based on this rate adjustment scheme, so as to decide whether to adjust the rate according to this rate adjustment scheme to access new services or reject The admission request. FIG. 4 is a schematic diagram of a processing flow of a preferred embodiment of the admission control of the method of the present invention for the fourth case. As shown in Figure 4, the specific processing steps are as follows:

Step 401: RNC estimates the load level of the whole cell after admitting the new service according to the current cell load measurement value and the service type and request rate in the service performance requirement of the new service.

Step 402: Judging whether the estimated value of the load level of the cell obtained in step 401 is greater than the target load value of the cell, if yes, execute step 403; otherwise, execute step 411.

Step 403: The system estimates the available bandwidth of the current system according to the current cell load measurement value and the service type in the service performance requirement of the new service.

Step 404: Judging whether the system available bandwidth estimated in step 403 is greater than the minimum rate in the service performance requirement of the new business, if yes, go to step 405; otherwise, go to step 406.

Step 405: configure the available bandwidth estimated in step 403 as the access rate of the new service, and execute step 411.

Wherein, the above step 401 to step 405 can also be:

Step 401: RNC calculates the current system available bandwidth according to parameters such as the current load level measurement result and the service type in the new service performance requirement; Step 402: Judging whether the system available bandwidth estimated in step 401 is less than the new service service performance requirement If yes, execute step 404; otherwise execute step 411; step 404: judge whether the system available bandwidth estimated in step 401 is greater than the minimum rate in the new business service performance requirement, if yes, execute step 405; otherwise execute Step 406; Step 405: configure the available bandwidth estimated in step 401 as the access rate of the new service, and execute step 411. Since the available bandwidth of the system has been estimated in step 401, step 403 is canceled here.

In the above processing steps, in order to ensure the rate of existing services, first estimate the available bandwidth of the current system in step 403 or step 401, and then judge whether the new service can be accessed with the available bandwidth in step 404, if the new service cannot be accessed with the available bandwidth , step 406 is executed, so as to proceed to the next step of negotiation. If the system does not need to ensure the existing service rate first, but needs to first ensure that new services are accessed as much as possible, then steps 403 to 405 may not be performed, that is, the execution of step 403 or step 404 described in step 402 is replaced by To execute step 406 .

Step 406: Determine the rate adjustment scheme for the existing controllable services and new services in the cell.

In the method of the present invention, the rate adjustment scheme for determining the existing controllable services and new services in the cell is determined by the RNC according to the service performance requirements of the existing controllable services and new services in the cell, and can be set to separately The rate of all existing controllable services is reduced by one or several levels until reduced to the minimum rate specified by their respective service performance requirements, and it can also be set to reduce the rate of some existing controllable services by one or several levels until reduced to The minimum rate specified by their respective service performance requirements can also be set to reduce the new service rate by one or several grades until it is reduced to the minimum rate specified by its service performance requirements, or it can be set to reduce all or part of the service rate at the same time. The rate of the existing controllable business and the new business are reduced by one or several levels until they are reduced to the minimum rate specified by their respective service performance requirements, but the present invention does not limit the specific setting method.

Step 407: Estimate the load level of the cell after adjusting the rates of existing controllable services and new services according to the rate adjustment scheme set in step 406 and accessing new services.

Step 408: Judging whether the estimated load level of the cell obtained in step 407 is greater than the target load value of the cell, if yes, go to step 409; otherwise, go to step 410.

Step 409: reject the admission request, and end the admission control.

Step 410: Adjust the rate of the existing controllable services in the cell according to the rate adjustment scheme determined in step 406, and configure the new service rate set in the adjustment scheme as the access rate for new services.

Step 411: Accept the admission request, and end the admission control.

Wherein, the processing from the above step 406 to step 410 may also be:

Step 406: Determine the rate adjustment scheme of the existing controllable business in the cell; Step 407: According to the current load measurement value of the cell and the service type in the service performance requirements of the new business, it is estimated that the rate adjustment scheme determined in step 406 can be adjusted After controlling the service rate, the available bandwidth of the system is set, and the access rate of the new service is set as the estimated system available bandwidth; Step 408: Determine whether the estimated system available bandwidth obtained in step 407 is less than the minimum rate in the new service performance requirement , if yes, execute step 409; otherwise execute step 410; step 409 remains unchanged; step 410: adjust the rate of the existing controllable service in the cell according to the rate adjustment scheme set in step 406, and configure the rate estimated in step 407 for the new service The available bandwidth is used as the access rate.

In addition, according to actual system design requirements, if the system requires as many access services as possible, step 409' may be further included before step 409. If in step 406, the rate adjustment scheme for existing controllable services and new services is determined, Then step 409' is: judge whether all existing controllable services and new service rates have been set as respective minimum rates in the determined rate adjustment scheme, if yes, perform step 409; otherwise return to step 406; if in step 406 is to determine the rate adjustment scheme of existing controllable services, then step 409' is: judge whether all existing controllable service rates have been set as respective minimum rates in the determined rate adjustment scheme, if yes, execute step 409; otherwise, return to step 406; then, in step 406, the RNC will re-determine the rate adjustment scheme. In this way, the system can repeatedly adjust the rate of existing controllable services to access new services as much as possible.

In the above solution, if it is judged in step 407 whether the estimated load level is greater than the load target value, it may further include before step 409: judging whether the minimum rate in the service performance requirement of the new business is 0, and if so, set it as 0 rate to access new services, and end admission control; otherwise, go to step 409. Since accessing a new service at a rate of 0 will not generate load and will not affect other existing services in the system, it can be admitted to a new service that does not limit the rate.

For scenario 5: the current cell load level is H, the existing service status of the current cell is CSN, and the new service type is NC. Since the current cell load level is higher than the load target value, and both the existing service and the new service of the cell are uncontrollable, Therefore, the system directly rejects such access requests.

For scenario 6: the current cell load level is H, the existing service status of the current cell is CSN, and the new service type is C, estimate the current system available bandwidth, set the access rate of new services to the estimated system available bandwidth, and the system Whether to accept the admission request is decided according to whether the minimum rate of the new service is less than the available bandwidth of the system. FIG. 5 is a schematic diagram of a processing flow of a preferred embodiment of the admission control of the method of the present invention for case six. As shown in Figure 5, the specific processing steps are as follows:

Step 501: RNC judges whether the minimum rate in the service performance requirement of the new service is 0, if yes, proceed to step 502; otherwise, proceed to step 503.

Here, since the current cell load level is higher than the load target value, it can be directly estimated that the available bandwidth of the system is 0, so in the rate adjustment scheme, the new service access rate is set to 0, and it is judged whether the available bandwidth of the system is 0 is less than The minimum rate for new traffic. Since the minimum rate of the new service is non-negative, the judgment is: determine whether the minimum rate of the new service is 0.

Step 502: Configure 0 rate as the access rate for the new service, access the new service, and end the admission control.

Step 503: reject the admission request, and end the admission control.

For scenario 7: the current cell load level is H, the existing service status of the current cell is CSI, and the new service type is C, determine the rate adjustment scheme for new services and existing controllable services, and then make a decision based on the rate adjustment scheme Whether the network can access new services, so as to decide whether to access new services after adjusting the rate according to this rate adjustment scheme or reject the access request. FIG. 6 is a schematic diagram of a processing flow of a preferred embodiment of the admission control of the method of the present invention for the seventh case. As shown in Figure 6, the specific processing steps are as follows:

Step 601: Determine the rate adjustment scheme for the existing controllable services and new services in the cell.

Step 602: Estimate the load level of the cell after adjusting the rates of existing controllable services and new services according to the rate adjustment scheme determined in step 601 and accessing new services.

Step 603: Judging whether the estimated load level of the cell obtained in step 602 is greater than the target load value of the cell, if yes, go to step 604; otherwise, go to step 605.

Step 604: reject the admission request, and end the admission control.

Step 605: Adjust the rate of existing controllable services in the cell according to the rate adjustment scheme determined in step 601, and configure the new service rate set in the adjustment scheme as the access rate for new services.

Step 606: Accept the admission request, and end the admission control.

Wherein, the processing of the above step 601 to step 605 can also be:

Step 601: Determine the rate adjustment scheme of the existing controllable services in the cell; Step 602: Estimate the available bandwidth of the system after adjusting the rate of the existing controllable services according to the rate adjustment scheme determined in step 601, and set the access rate of new services Be the estimated system available bandwidth; step 603: judge whether the system available bandwidth estimation value that step 602 obtains is less than the minimum rate in the new business service performance requirement, if yes, execute step 604; otherwise execute step 605; step 604 remains unchanged ; Step 605: adjust the rate of the existing controllable services in the cell according to the rate adjustment scheme determined in step 601, and configure the available bandwidth estimated in step 602 as the access rate for new services.

In addition, according to actual system design requirements, if the system requires as many access services as possible, step 604' may be further included before step 604. If in step 601, the rate adjustment scheme for existing controllable services and new services is determined, Then step 604' is: judge whether all existing controllable services and new service rates have been set as respective minimum rates in the determined rate adjustment scheme, if yes, perform step 604; otherwise return to step 601; if in step 601 is to determine the rate adjustment scheme of existing controllable services, then step 604' is: judge whether all existing controllable service rates have been set to their respective minimum rates in the determined rate adjustment scheme, if yes, perform step 604; otherwise, return to step 601; then, in step 601, the RNC will re-determine the rate adjustment scheme. In this way, the system can repeatedly adjust the rate of existing controllable services to access new services as much as possible.

In the above solution, if it is judged in step 603 whether the estimated load level is greater than the load target value, it may further include before step 604: judge whether the minimum rate in the new business service performance requirement is 0, and if so, set the minimum rate as 0 rate to access new services, and end admission control; otherwise, go to step 604.

For scenario 8: the current cell load level is H, the existing service status of the current cell is CSI, and the new service type is NC, the system determines the existing controllable service rate adjustment scheme, and then decides whether it can be based on this rate adjustment scheme Access new services, so as to decide whether to access new services after adjusting the rate according to this rate adjustment scheme or reject the admission request. FIG. 7 is a schematic diagram of a processing flow of a preferred embodiment of the admission control of the method of the present invention for the eighth situation. As shown in Figure 7, the specific processing steps are as follows:

Step 701: Determine that the cell already has a rate adjustment scheme for controllable services.

Step 702: Estimate the load level of the cell after adjusting the rate of existing controllable services and accessing new services according to the rate adjustment scheme determined in step 701. Here, the request rate in the new business service performance requirements is used when estimating the load level.

Step 703: Judging whether the estimated cell load level obtained in step 702 is greater than the target load value of the cell, if yes, go to step 704; otherwise, go to step 705.

Wherein, the processing of above-mentioned step 702, step 703 can also be:

Step 702: Estimate the available bandwidth of the system after adjusting the existing controllable service rate according to the rate adjustment plan determined in step 701; Step 703: Determine whether the estimated value of system available bandwidth obtained in step 702 is less than the request rate in the new service performance requirement , if yes, go to step 704; otherwise, go to step 705.

Step 704: reject the admission request, and end the admission control.

Step 705: Adjust the rate of the existing controllable services in the cell according to the rate adjustment scheme determined in step 701.

Step 706: Accept the admission request, and end the admission control.

In addition, according to actual system design requirements, if the system requires as many access services as possible, step 704' may be further included before step 704: determine whether all existing controllable service rates have been set in the determined rate adjustment scheme. Set as their respective minimum rates, if yes, execute step 704; otherwise, return to step 701; then, in step 701, the RNC will re-determine the rate adjustment scheme. In this way, the system can repeatedly adjust the rate of existing controllable services to access new services as much as possible.

In the WCDMA system, when a mobile user initiates a new call or applies for handover in a new cell, or adds a new service during an existing call, or reconfigures channels for existing services The admission control described in the method of the present invention may be performed. Here, initiating a new call in a new cell and adding a new service during an existing call are defined as new service access; applying for switching in a new cell is defined as switching, and switching is divided into It is divided into two types: same-frequency handover and inter-frequency handover; channel reconfiguration for existing services is defined as channel reconfiguration; new service access requests can be divided into: new service access, same-frequency handover, and inter-frequency handover and channel reconfiguration four categories. In addition, when performing admission control, the uplink and downlink perform admission control separately, and only when both uplink and downlink judge that the admission request can be accepted, the system accepts the admission request and accesses new services. The foregoing embodiments may be applied to the uplink or downlink admission control of the three admission requests of new service access, inter-frequency handover and channel reconfiguration.

When the method of the present invention is applied to the downlink admission control of the same-frequency handover, the scheme adopted is basically the same as the above-mentioned scheme, because the user of the same-frequency handover cannot directly reduce its original service rate, and needs to pass through the reconfiguration of the rate. Configuration is used to complete the adjustment of the rate, so it is necessary to replace the access rate configuration for the new service with: put forward a rate reconfiguration suggestion for the new service, and reject the access request of the new service, and the new service will reconfigure the rate according to this suggestion After that, the admission request is resubmitted at this reconfigured rate.

That is to say: the processing for the above-mentioned situation five remains unchanged, and the processing described in Fig. 6. The processing described in Fig. 2, Fig. 4, Fig. 5 and Fig. 6 corresponding to case 7 becomes:

In Figure 2, step 206 is: put forward a suggestion to reconfigure the access rate of the new service to the available system bandwidth estimated in step 203, and reconfigure the access rate of the new service to the available system bandwidth according to this suggestion and re-initiate the admission request , execute step 201;

In Figure 4, step 405 is: put forward a suggestion to reconfigure the access rate of the new service to the available bandwidth of the system estimated in step 403, and reconfigure the access rate of the new service to the available bandwidth of the system according to this suggestion and re-initiate the admission request , execute step 401; step 410 is: adjust the rate of existing controllable services in the cell according to the rate adjustment scheme determined in step 406, and propose to reconfigure the new service access rate to the rate set in the rate adjustment scheme described in step 406 Suggestion on the new service rate or the system available bandwidth estimated in step 407, the new service will reconfigure the access rate to the new service rate or system available bandwidth set in the rate adjustment scheme according to this suggestion, and re-initiate the admission request, execute Step 401; before step 409, the processing after judging that the minimum rate of the new service is 0 is: put forward a suggestion to reconfigure the access rate of the new service to a rate of 0, and reconfigure the access rate of the new service to 0 according to this suggestion rate and re-initiate the admission request, go to step 401;

In Fig. 5, step 502 is: put forward a proposal to reconfigure the access rate of the new service to 0 rate, and reconfigure the access rate of the new service to 0 rate according to this suggestion and re-initiate the admission request, and execute step 501;

In Figure 6, step 605 is: adjust the rate of existing controllable services in the cell according to the rate adjustment scheme determined in step 601, and propose to reconfigure the new service access rate to the new rate set in the rate adjustment scheme described in step 601. Suggestion on the service rate or system available bandwidth estimated in step 602, the new service reconfigures the access rate to the new service rate or system available bandwidth set in the rate adjustment scheme according to this suggestion, and re-initiates the admission request, and executes the steps 601; Before step 604, the processing after judging that the minimum rate of the new service is 0 is: put forward a suggestion to reconfigure the access rate of the new service to a rate of 0, and reconfigure the access rate of the new service to a rate of 0 according to this suggestion And re-initiate the admission request, go to step 601.

When the method of the present invention is applied to uplink admission control of intra-frequency handover, since the uplink load at this time already includes the load generated by the new service currently applying for admission, the new service is directly allowed to be admitted.

In summary, it can be seen that the application of the embodiment of the method of the present invention can enable the RNC to conduct business negotiation on the existing controllable services and application admission services of the system when performing admission control, thereby maximizing the system capacity and making full use of the system. wireless resources.

Claims (16)

1. An admission control method using negotiation mechanism includes the following steps:

a. after receiving an admission request of a new service, a base station controller RNC obtains a new service type according to the service performance requirement of the new service in the admission request, simultaneously obtains a load measurement value of a current access cell and analyzes the composition of the current existing service to obtain the load level of the current cell and the existing service condition of the current cell;

b. judging whether the current cell load level is lower than a cell load target value, if so, executing the step c; if the current cell load level is higher than the cell load target value and the controllable service exists in the existing services or the new service is the controllable service, executing the step d; if the current cell load level is higher than the cell load target value and both the existing service and the new service are uncontrollable services, rejecting the admission request and ending the admission control;

c. judging whether the current cell can be accessed to the new service, if so, receiving the access request and ending the access control; if the new service can not be accessed, and the existing service has controllable service or the new service is controllable service, executing step d; if the new service can not be accessed and the existing service and the new service are uncontrollable services, rejecting the admission request and ending the admission control;

d. determining a rate adjustment scheme of controllable service, controllable new service or a combination of the controllable new service and the controllable new service in the existing service according to the current existing service condition and the new service type, judging whether the current cell can access the new service after the rate is adjusted according to the scheme, if so, adjusting the rate according to the rate adjustment scheme, receiving the admission request, and ending the admission control; otherwise, refusing the admission request and ending the admission control.

2. The method of claim 1, wherein in step c, the method for determining whether the current cell can access the new service comprises:

estimating the load level of the cell after the new service is accessed, judging whether the estimated load level of the cell is higher than a cell load target value, if so, the current cell can not access the new service; otherwise, the current cell can access the new service.

3. The method of claim 1, wherein in step c, the method for determining whether the current cell can access the new service comprises:

estimating the current available bandwidth of the system, judging whether the estimated available bandwidth of the system is smaller than the request rate of the new service, if so, the current cell can not access the new service; otherwise, the current cell can access the new service.

4. The method of claim 1, wherein when there is no controllable service in the existing services and the new service is a controllable service, in step d,

the rate adjustment determining scheme specifically comprises: estimating the current available bandwidth of the system, and setting the access rate of the new service as the estimated available bandwidth of the system;

the method for judging whether the cell can access the new service comprises the following steps: judging whether the estimated available bandwidth of the system is smaller than the minimum rate of the new service, if so, the current cell can not access the new service; otherwise, the current cell can access the new service;

the rate adjustment according to the rate adjustment scheme specifically comprises the following steps: and configuring the estimated available bandwidth of the system for the new service as the access rate.

5. The method of claim 3, wherein when there is no controllable service in the current existing services and the new service is a controllable service, in step d,

the rate adjustment determining scheme specifically comprises: setting the access rate of the new service as the system available bandwidth estimated in the step c;

the method for judging whether the cell can access the new service comprises the following steps: c, judging whether the estimated system available bandwidth is less than the minimum rate of the new service, if so, the current cell can not access the new service; otherwise, the current cell can access the new service;

the rate adjustment according to the rate adjustment scheme specifically comprises the following steps: and configuring the estimated available bandwidth of the system for the new service as the access rate.

6. The method of claim 1, wherein when there is a controllable service in the existing services and the new service is an uncontrollable service, in step d,

the rate adjustment determining scheme specifically comprises: setting the rate of the existing controllable service;

the method for judging whether the cell can access the new service comprises the following steps: estimating the available bandwidth of the system after the rate of the existing controllable service is adjusted according to the rate adjustment scheme, judging whether the estimated available bandwidth of the system is smaller than the request rate of the new service, if so, the current cell can not access the new service; otherwise, the current cell can access the new service; or,

estimating the cell load level of the new service accessed after the existing controllable service rate is adjusted according to the rate adjustment scheme, and then judging whether the estimated load level is higher than a load target value, if so, the current cell can not access the new service; otherwise, the current cell can access the new service;

the rate adjustment according to the rate adjustment scheme specifically comprises the following steps: and adjusting the rate of the existing controllable service according to the rate adjustment scheme.

7. The method of claim 1, wherein when there is a controllable service in the existing services and the new service is a controllable service, in step d,

the rate adjustment determining scheme specifically comprises: setting the speed of the existing controllable service, estimating the available bandwidth of the system after the speed of the existing controllable service is adjusted according to the speed adjusting scheme, and setting the access speed of the new service as the estimated available bandwidth of the system;

the method for judging whether the cell can access the new service comprises the following steps: judging whether the estimated available bandwidth of the system is smaller than the minimum rate of the new service, if so, the current cell can not access the new service; otherwise, the current cell can access the new service;

the rate adjustment according to the rate adjustment scheme specifically comprises the following steps: and adjusting the rate of the existing controllable service according to the rate adjustment scheme, and configuring the estimated available bandwidth of the system for the new service as the access rate.

8. The method of claim 1, wherein when there is a controllable service in the existing services and the new service is a controllable service, in step d,

the rate adjustment determining scheme specifically comprises: setting the speed of the existing controllable service and the new service;

the method for judging whether the cell can access the new service comprises the following steps: estimating the cell load level of the new service after adjusting the existing controllable service and the new service rate according to the rate adjustment scheme, judging whether the estimated load level is higher than a load target value, if so, the current cell can not access the new service; otherwise, the current cell can access the new service;

the rate adjustment according to the rate adjustment scheme specifically comprises the following steps: and adjusting the speed of the existing controllable service according to the speed adjusting scheme, and configuring the new service speed set in the speed adjusting scheme for the new service as the access speed.

9. The method according to claim 2, wherein when there is a controllable service in the existing services and the new service is a controllable service, step c further comprises, before the step d is executed: estimating the current available bandwidth of the system, judging whether the estimated available bandwidth of the system in the step c is smaller than the minimum rate of the new service, if so, executing the step d; otherwise, the estimated system available bandwidth is configured for the new service as the access rate, the admission request is received, and the admission control is finished.

10. The method according to claim 3, wherein when there is a controllable service in the existing services and the new service is a controllable service, in step c, before the step d, the method further comprises: judging whether the estimated system available bandwidth in the step c is smaller than the minimum rate of the new service, if so, executing the step d; otherwise, the estimated system available bandwidth is configured for the new service as the access rate, the admission request is received, and the admission control is finished.

11. The method according to claim 6 or 7, wherein when there is a controllable service in the existing services, the step d of rejecting the admission request further comprises: judging whether all the existing controllable service rates are set to respective minimum rates in the rate adjustment scheme, and if so, rejecting the admission request; otherwise, re-executing step d.

12. The method of claim 8, wherein when there is controllable service in the existing services and the new service is controllable service, the step d of rejecting the admission request further comprises: judging whether all the existing controllable services and the new service rates are set to respective minimum rates in the rate adjustment scheme, and if so, rejecting the admission request; otherwise, re-executing step d.

13. The method according to claim 8 or 12, wherein when there is controllable traffic in the existing traffic and the new traffic is controllable traffic, the step of rejecting the admission request further comprises: judging whether the minimum rate of the new service is 0, if so, configuring 0 rate for the new service as an access rate, and receiving an access request; otherwise, the admission request is refused.

14. The method according to claim 4, 5, 9 or 10, wherein when the current admission request is an admission request of intra-frequency handover, in step d, after the new service is judged to be accessible, the processing step is: and b, proposing a proposal for rate reconfiguration to the estimated available bandwidth of the system for the new service, reconfiguring the self access rate of the new service to the available bandwidth of the system according to the proposed proposal, and re-sending an admission request to return to the step a.

15. The method according to claim 7 or 8, wherein when the current admission request is an admission request of intra-frequency handover, in step d, after the new service is judged to be accessible, the processing step is: and b, adjusting the speed of the existing controllable service according to the speed adjusting scheme, proposing a proposal for reconfiguring the access speed into a new service speed set in the speed adjusting scheme for the new service, reconfiguring the self access speed into the new service speed set in the speed adjusting scheme according to the proposed proposal for the new service, and re-sending an admission request and returning to the step a.

16. The method of claim 13, wherein after determining that the minimum rate of the new service is 0, the processing step is: and b, proposing a proposal of reconfiguring the access rate to 0 rate for the new service, reconfiguring the self access rate to 0 rate by the new service according to the proposed proposal, and re-sending an admission request to return to the step a.