SIP Header Mobility Transfer Indicator
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Solution Overview
Problem
In mobile communication scenarios, when a device roams from one SIP-based network to another or from a SIP-based network to a circuit-switched network during a call, the device may lose connectivity before receiving a notification to release the original communication segment, leading to issues in properly terminating the session.
Innovation Solution
The method involves generating and sending a Session Initiation Protocol (SIP) request with a mobility transfer type indicator to manage the transition smoothly, allowing the device to initiate the release of the original communication segment even if connectivity is lost, by including a mobility transfer type indicator in SIP requests such as SIP INVITE and SIP BYE requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile device loses connectivity to the first network before receiving the release notification, then the device cannot immediately release the original communication segment in a conventional manner, but attempting to do so may be interpreted by the communication network as a release of the communication session
Solution Approach 1:
The patent applies preliminary action by including the mobility transfer type indicator in the SIP request before the actual mobility transfer occurs. This allows the receiving end to prepare appropriate processing in advance, ensuring that when connectivity is lost, the system already has the context needed to correctly interpret subsequent requests and avoid unintended session termination.
Solution Approach 2:
The mobility transfer type indicator acts as an intermediary element that carries critical context information between the mobile device and the network. This indicator serves as a mediator that bridges the information gap created by connectivity loss, allowing the network to correctly interpret device requests without needing continuous communication.
2Productivity
If a notification is sent to the mobile device to release the original communication segment, then the release process can be initiated, but the device may lose connectivity before receiving such notification
Solution Approach 1:
The patent includes the mobility transfer type indicator in advance in the SIP request, eliminating the need to wait for separate release notifications. This preliminary inclusion of context information accelerates the mobility transfer process by allowing immediate and correct processing without time-consuming notification delays.
3Adaptability or versatility
If the mobile device attempts to release the original communication segment without proper notification, then connectivity loss is handled, but the network may interpret this as a release of the communication session
Solution Approach 1:
The mobility transfer type indicator serves as a reliable intermediary that preserves session integrity information. When the device attempts to release the communication segment after connectivity loss, the network uses this pre-transmitted indicator to distinguish between a legitimate mobility transfer and an unintended session termination, maintaining communication session integrity.
Solution Approach 2:
The patent applies preliminary anti-action by pre-transmitting the mobility transfer type indicator to prevent the harmful misinterpretation of device requests. This advance information counteracts the potential negative effect of the network incorrectly interpreting release attempts as session terminations.
Data Source
AI summary
A method (500) of indicating a process to be implemented in support of a mobility transfer operation and a method (600) of responding to a mobility transfer operation being initiated. A session initiation protocol (SIP) request (120, 124, 128, 220, 226, 228) can be generated. The SIP request can indicate a mobility transfer type that corresponds to the mobility transfer operation. The SIP request can be sent from a first device (102, 106) participating in the mobility transfer operation to at least a second device (106, 102) participating in the mobility transfer operation.