IMS Session Timer Adaptation for Reduced Latency
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Solution Overview
Problem
Conventional IMS conversational services in telecommunications networks experience session timeouts that exceed acceptable user experience due to fixed timer settings, leading to inefficient communication link establishment and unnecessary network load, as these settings are not adaptable to varying network conditions and user situations.
Innovation Solution
The method involves transmitting request timer information from the telecommunications network to user equipment during SIP registration or service initiation, allowing for dynamic configuration of request timeout time intervals based on specific network conditions and user context, such as radio access, service type, and interconnection scenarios, ensuring timers are optimized for each situation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed timer settings (e.g., B timer = 128 seconds) are used for SIP session timeout control, then network stability and compatibility are maintained, but user experience deteriorates due to excessively long session timeouts for conversational services
Solution Approach 1:
The patent applies dynamics by enabling the timer value to change from fixed to adaptive. The network node dynamically determines appropriate timer values based on service type, user equipment capabilities, and network conditions, allowing the timeout parameter to be optimized for each specific scenario rather than using a universal fixed value
Solution Approach 2:
The patent implements parameter changes by modifying the timer value parameter based on different service types and network conditions. The network node adjusts the timeout parameter dynamically, changing it from the conventional fixed 128 seconds to context-appropriate values that balance network stability with user experience requirements
2Device complexity
If conventional fixed timer values are applied across all network scenarios, then implementation simplicity is maintained, but adaptability to specific network conditions and service types deteriorates
Solution Approach 1:
The patent applies local quality by tailoring the timer value to specific local conditions such as service type, user equipment capabilities, and network state. Each scenario receives a customized timer value determined by the network node based on relevant parameters, ensuring optimal performance for each specific context
3Reliability
If longer timer values are used to ensure network response coverage, then network reliability is improved, but communication link establishment speed deteriorates due to unnecessary waiting time
Solution Approach 1:
The patent applies partial or excessive action by setting the timer value to the minimum necessary duration for each specific scenario rather than using a uniformly excessive long timeout. The network node determines appropriate timer values that provide sufficient coverage for network responses without imposing unnecessary waiting time, optimizing the balance between reliability and speed
Data Source
Figure 1~2
AI summary
The invention relates to a method for improved handling of an IMS (Internet Multimedia Subsystem) conversational service of a user equipment being connected to a telecommunications network comprising or being associated to an IMS network, wherein the user equipment applies a request timer information, related to a request timeout time interval, when attempting to initiate the IMS conversational service, wherein the request timeout time interval is started upon the initiation of the IMS conversational service, wherein the method comprises the following steps: - in a first step, the user equipment attempts to SIP (Session Initiation Protocol) register towards the telecommunications network or the IMS network, — in a second step, subsequent to the first step, the user equipment attempts to initiate the IMS conversational service, and wherein the request timer information, related to the request timeout time interval to be applied by the user equipment for the IMS conversational service is transmitted, by the telecommunications network, to the user equipment either during the first step or during the second step, wherein the IMS conversational service is attempted to be initiated while the request timeout time interval has not expired.