WTRU SM Capability Reporting via SIP in IMS
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication standards do not provide a means for a wireless transmit/receive unit (WTRU) to report its short message (SM) capability via an IP multimedia subsystem (IMS), leading to potential loss of SMS messages when the preferred delivery mode is mismatched between the WTRU's operation and the network.
Innovation Solution
A method and system that enables a WTRU to report its SM capability over an IMS using a Session Initiation Protocol (SIP), allowing the core network to update the WTRU's capabilities and route SMS messages accordingly, ensuring correct delivery via IMS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the WTRU operates on a GPRS network with preferred setting on GSM network, then the WTRU can maintain its preferred delivery mode, but SMS messages may be lost because the core network is unaware of the WTRU's SM capability
Solution Approach 1:
The WTRU performs preliminary action by including its SM capability indication in the SIP REGISTER message sent to the IMS core network during the registration phase. This allows the core network to be informed of the WTRU's capability before any SMS routing decisions are made, preventing message loss due to capability mismatch.
Solution Approach 2:
The system implements feedback by having the WTRU actively report its SM capability status to the core network through SIP messaging. This feedback mechanism enables the core network to adjust routing decisions based on the WTRU's actual capability, ensuring reliable SMS delivery regardless of the current network operating mode.
2Adaptability or versatility
If the WTRU indicates preferred GSM network delivery while operating on GPRS, then the WTRU maintains its preferred mode setting, but SMS messages may be lost due to network unawareness of capability
Solution Approach 1:
The SIP REGISTER message acts as an intermediary carrier that transports the WTRU's SM capability information from the WTRU to the IMS core network. This intermediary mechanism enables the core network to become aware of the WTRU's capability without requiring changes to the WTRU's preferred mode settings, thus maintaining adaptability while improving reliability.
3Device complexity
If no SM capability reporting mechanism via IMS is provided, then the system maintains simplicity, but the core network cannot route SMS messages correctly to the WTRU
Solution Approach 1:
The SIP REGISTER message, which already serves the universal function of registering the WTRU with the IMS network, is enhanced to also carry SM capability information. This multi-functionality approach allows the same messaging mechanism to perform both registration and capability reporting, avoiding the need for separate complex reporting procedures while improving routing accuracy.
Data Source
AI summary
A method performed by a WTRU may comprise transmitting a request for attachment to a base station. Authentication may be performed between the WTRU and a cellular core network node of a cellular core network, via the base station. The method may further comprise transmitting a registration request to the cellular core network via SIP over an IMS and transmitting a SIP message indicating a capability of the WTRU to receive data messages via the IMS. The WTRU may receive, in accordance with the capability of the WTRU to receive data messages via the IMS, at least one data message, from the base station, via the IMS. The data message may be displayed on a display of the WTRU.