Session Re-negotiation for High Rate Packet Data Access Terminals
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Solution Overview
Problem
In high rate packet data systems, when an access terminal moves from a Rev-0 access network to a Rev-A access network, the session is not re-negotiated to utilize advanced protocol subtypes and improved Quality of Service (QoS) mechanisms, despite both the terminal and network being capable of supporting them.
Innovation Solution
The method involves the access terminal sending a UATI Request message to the target network, allowing the network to acquire the source network's address and initiate session transfer, and then sending all non-default protocol subtypes and application information to facilitate re-negotiation, ensuring both the terminal and network can support enhanced protocols and applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the access terminal uses default protocol subtypes during session transfer, then the session transfer process is simple and fast, but the Quality of Service and protocol capabilities are limited
Solution Approach 1:
The access terminal stores capability information about supported non-default protocol subtypes and applications in advance. When moving to a new access network, this pre-stored capability information is automatically transmitted during session transfer, enabling the network to initiate re-negotiation for enhanced QoS without requiring complex real-time capability exchanges.
Solution Approach 2:
The system changes the protocol subtype parameters from default to non-default by transmitting capability information that indicates supported advanced protocol subtypes and applications. This parameter change enables the session to be re-negotiated with enhanced QoS mechanisms when the access terminal moves to a Rev-A capable network.
2Adaptability or versatility
If the access terminal transmits capability information to trigger session re-negotiation, then advanced protocol subtypes and QoS mechanisms can be utilized, but the message overhead and processing time increase
Solution Approach 1:
Capability information regarding supported non-default protocol subtypes and applications is stored in the access terminal before movement occurs. This preliminary preparation allows the information to be transmitted efficiently during session transfer without requiring time-consuming real-time capability discovery exchanges.
Solution Approach 2:
The capability information acts as an intermediary that carries protocol capability metadata between the access terminal and access network. By transmitting this compact capability information rather than performing extensive real-time capability negotiations, the system reduces processing time while maintaining adaptability.
3Adaptability or versatility
If the access terminal moves between access networks with different capabilities, then network coverage and mobility are improved, but session compatibility and QoS optimization are lost
Solution Approach 1:
When the access terminal detects movement to a new access network, it transmits capability information indicating supported non-default protocol subtypes. This triggers a parameter change in the session configuration, allowing the session to be re-negotiated with enhanced QoS parameters if the target network supports them.
Solution Approach 2:
The access terminal provides feedback to the access network about its capability to support advanced protocol subtypes and applications by transmitting capability information. This feedback mechanism enables the network to make informed decisions about session re-negotiation and QoS optimization based on the terminal's actual capabilities.
Data Source
AI summary
The invention relates to a method for triggering re-negotiation of a session when an Access Terminal moves from one access network (source AN) to another access network (target AN) having different capabilities in high rate packet data system. According to an exemplary embodiment of the invention, the source AN is allowed to store all the protocol subtypes, protocols and applications that AT is capable of and also allowing the AT to send this information in priority order during session negotiation and hence facilitating the transfer of this information from source AN to target AN during session transfer when AT moves from one AN to another AN. An alternate embodiment is to let the AT send the protocol subtypes, protocols and applications and other AT capable information to target AN after it moves to a new AN or by letting the Rev-A capable AN query the AT's capability information and then the AT providing this information. In another exemplary embodiment, the invention includes re-negotiation by introducing a revision (like Protocol revision) information in overhead information messages that an AN broadcasts to all ATs.