Call Admission Control via Channel Utilization Manager

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Solution Overview

Problem

Existing telecommunications systems face challenges in efficiently managing call admission control in shared-access systems, particularly in ensuring quality of service without adding costly call admission control functionality to every access point.

Innovation Solution

Implementing a channel utilization manager that determines whether available resources can support candidate calls, allowing the SIP proxy server to request admission and notify terminals of acceptance or rejection, thereby decentralizing call admission control from access points.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If call admission control functionality is implemented at every access point, then quality of service can be maintained, but system cost and device complexity increase

Engineering Contradiction:

Improvequality of serviceVSAvoidcall admission control functionality at access points

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent introduces a call admission control server as an intermediary component that centralizes the call admission control function. Instead of implementing this functionality at every access point, the server acts as a mediator between terminals and access points, making decisions about call admission based on channel utilization information received from access points. This resolves the contradiction by maintaining quality of service through centralized control while reducing the complexity and cost of individual access points.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent segments the call admission control function from the access point functionality. The access points continue to provide basic wireless access services, while the separate call admission control server handles the complex decisions about resource allocation and quality of service. This segmentation allows each component to be simpler and more specialized, reducing overall system complexity while maintaining service quality.

Inventive Principle:

Principle #1Segmentation

2Speed

If call admission control is decentralized to access points, then response time improves, but system cost increases

Engineering Contradiction:

Improvecall admission response timeVSAvoidsystem cost

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The call admission control server serves as an intermediary that receives channel utilization information from access points and makes admission decisions centrally. This approach maintains relatively fast response times by having access points immediately report their status to the server, while avoiding the need for each access point to implement complex call admission control logic, thereby reducing system cost.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Area of stationary object

If more access points are deployed to cover larger area, then service coverage improves, but channel utilization management becomes more difficult

Engineering Contradiction:

Improveservice coverage areaVSAvoidchannel utilization management

Core Design Contradiction:

Area of stationary objectVSDevice complexity

Solution Approach 1:

The call admission control server acts as a central intermediary that manages channel utilization across all access points serving the expanded coverage area. The server receives channel utilization information from multiple access points and coordinates admission decisions to ensure efficient resource allocation throughout the entire service area, making it easier to manage channel utilization as the network expands.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The call admission control server provides universal management capabilities that apply across all access points regardless of their location or specific characteristics. This centralized multi-functional approach allows the same management logic to be applied consistently throughout the entire service coverage area, simplifying the management of channel utilization as the network grows.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS8665714B2Call admission control of shared-access resources through a call-handling server

Publication Date: 2014.03.04 AVAYA INC

AI summary

A method and an apparatus are disclosed that enable call admission control for telecommunications terminals that use shared-access resources, without relying on an implementation at every access point to provide those resources. In particular, in accordance with the illustrative embodiment of the present invention, a first wireless terminal calls a second terminal by transmitting a traffic stream description that specifies the nature of the call to an intermediary call-handling server, such as a Session Initiation Protocol (SIP) proxy server. The SIP proxy determines from the Internet Protocol address of the calling terminal that the terminal uses a shared-access resource—in this case, a wireless shared-communications channel—and makes a request to a channel utilization manager to admit the call. Subsequently, the SIP proxy receives a message from the channel utilization manager that indicates whether the call has been admitted.