SIP Proxy Authorization for IP Multimedia Services
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Solution Overview
Problem
Existing mobile networks face challenges in authorizing and managing access to multimedia services across different wireless access protocols, leading to potential revenue losses from unauthorized IP multimedia services like VoIP, as existing schemes either restrict access too broadly or fail to adequately control resource usage.
Innovation Solution
A method and system for controlling IP multimedia service authorization by examining the identity of the access network and the requested service, authorizing resources if supported, rejecting unsupported services if policy requires, and providing a default resource level if not supported, utilizing a SIP Proxy server, Home Subscriber Server, and Policy Function to manage Quality of Service constraints and allocate bearer level resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If SIP Proxies are used to minimize potential revenue losses from unauthorized VoIP service, then revenue protection is improved, but access to free services available over the public Internet is restricted
Solution Approach 1:
The patent applies local quality by differentiating authorization rules based on the specific access network type. The SIP Proxy examines the access network identity and applies network-specific authorization policies, allowing free services over public Internet access networks while restricting unauthorized services over paid access networks. This localized approach enables precise control without global restrictions.
Solution Approach 2:
The patent changes the authorization parameter from a binary authorized/unauthorized state to a nuanced state that considers access network type. By introducing access network identity as a variable in the authorization decision process, the system can dynamically adjust authorization levels based on whether the user is on a public or private access network.
2Reliability
If access network resources are authorized for IP multimedia services, then service quality is improved, but potential revenue loss from unauthorized services increases
Solution Approach 1:
The patent implements preliminary action by performing authorization checks before allocating access network resources. The SIP Proxy examines the access network identity and service identity in advance, determining whether to authorize resources before the service actually consumes them. This prevents unauthorized services from consuming resources while ensuring authorized services receive adequate resources for quality delivery.
3Loss of energy
If SIP Proxies restrict access to unauthorized services, then revenue protection is improved, but interoperability across different access networks is reduced
Solution Approach 1:
The patent applies universality by creating a standardized authorization mechanism that works across multiple access network types. The SIP Proxy uses a universal approach of examining access network identity and applying appropriate policies, whether the user is on cellular, Wi-Fi, or other access networks. This maintains interoperability while enabling network-specific authorization rules.
Data Source
AI summary
The described embodiments of the present invention include a method for controlling authorization of a multimedia service requested by a user device. In one embodiment, the method includes examining an identity of an access network associated with the user device and an identity of the service requested to determine whether the service is supported; authorizing resources in the access network required by the service if the service is supported; rejecting the service if the service is not supported and if a policy associated with the access network requires unsupported services to be rejected; and authorizing a default level of resources in the access network if the service is not supported and if the policy associated with the access network does not require unsupported services to be rejected.