Method and system for performing call admission control in a communication system

• US 20070077937A1
• Filed: 08/26/2005
• Published: 04/05/2007
• Est. Priority Date: 08/26/2005
• Status: Abandoned Application

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Ramakrishnan, Kajamalai, Rangamani, Sundar
• Application Number:
  US11/213,299
• Publication Number:
  US 20070077937A1
• Time in Patent Office: Days
• US Class Current: 455/453
• CPC Class Codes: H04W 28/16 Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
• CPC Class Codes: H04W 72/52 based on load

Abstract

A method and system for performing call admission control (CAC) in a communication system. The method comprises determining whether traffic of at least one call-type is overloaded in a predetermined measuring window. The method further comprises reallocated the resources of each call-type in response to determining whether traffic of at least call-type is overloaded in the predetermined measuring window.

Claims

1. A method for performing call admission control (CAC) in a communication system, the method comprising:

determining whether traffic of at least one call-type is overloaded in a predetermined measuring window; and

reallocating the resources of each call-type in response to determining whether traffic of the at least one call-type is overloaded.

2. The method of claim 1, wherein the reallocating step comprises:

estimating unused resources in the predetermined measuring window;

calculating a weight corresponding to each call-type; and

apportioning unused resources among each call-type based on corresponding weight.

3. The method of claim 2, wherein the weight of a call-type is a function of a reservation parameter of the call-type.

4. The method of claim 3, wherein the weight of the call-type is a function of resource utilization of the call-type in the predetermined measuring window and a resource-utilization-upper bound in the predetermined measuring window.

5. The method of claim 2, wherein the weight of a call-type is equal to zero, if the traffic of the call-type is under-loaded in the predetermined measuring window.

6. The method of claim 1, further comprising:

updating a throttle value of each call-type based on the reallocated resources corresponding to each call-type.

7. The method of claim 6, wherein updating step comprises:

updating a resource-utilization-upper bound of each call-type based on the reallocated resources corresponding to each call-type.

8. A method for managing a plurality of calls in a communication system, a call belonging to a call-type, the method comprising:

defining a predetermined measuring window;

measuring an average resource utilization of each call-type in the predetermined measuring window; and

performing call admission control (CAC) in the communication system, wherein the performing step comprises;

determining whether traffic of at least one call-type is overloaded in the predetermined measuring window; and

reallocating the resources of each call-type in response to determining whether traffic of the at least one call-type is overloaded.

9. The method of claim 8, wherein the step of performing CAC is executed at the end of the predetermined measuring window.

10. The method of claim 8, further comprising:

computing a resource-utilization-upper bound of each call-type in the predetermined measuring window.

11. The method of claim 8 further comprising:

allocating predetermined resources to each call-type; and

associating a predetermined reservation parameter to each call-type.

12. The method of claim 11, wherein the predetermined resources are allocated to each call-type based on an unconstrained optimization model.

13. The method of claim 11, wherein the predetermined resources are allocated for each call type based on an optimization model with constraints on QoS delay guarantees.

14. The method of claim 11, wherein a predetermined reservation parameter of a call-type is computed based on the priority of managing the call-type in the communication system.

15. A call manager for managing a plurality of calls in a communication system, a call belonging to a call-type, the call manager comprising:

a defining module, the defining module defining a predetermined measuring window;

a measuring module, the measuring module measuring an average resource utilization of each call-type in the predetermined measuring window; and

a call admission controller, the call admission controller performing call admission control (CAC) in the communication system, wherein the call admission controller comprises;

a determining module, the determining module determining whether traffic of at least one call-type is overloaded in the predetermined measuring window; and

a resource-reallocating module, the resource-reallocating module reallocating the resources of each call-type in response to an input from to the determining module.

16. The call manager of claim 15, wherein the resource-reallocating module comprises:

an unused-resource-estimator, the unused-resource-estimator estimating unused resources in the predetermined measuring window;

a weight-calculator, the weight-calculator calculating a weight corresponding to each call-type; and

an apportioning module, the apportioning module apportioning unused resources among each call-type based on corresponding weight.

17. The call manager of claim 15, wherein the call admission controller further comprises:

a throttle-value-estimator, the throttle-value-estimator estimating a throttle value of each call-type based on the reallocated resources corresponding to each call-type.

18. The call manager of claim 17, wherein the throttle-value-estimator comprises:

an updating module, the updating module updating a resource-utilization-upper bound of each call-type based on the reallocated resources corresponding to each call-type.

19. The call manager of claim 15 further comprising:

an upper-bound estimator, the upper-bound estimator computing a resource-utilization-upper bound of each call-type in the predetermined measuring window.

20. The call manager of claim 15 further comprising:

a resource-allocating module, the resource-allocating module allocating predetermined resources to each call-type; and

an associating module, the associating module associating a predetermined reservation parameter to each call-type.