Wireless Detach Handling via Handover to Retain Gateway State
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Solution Overview
Problem
In multiple-access wireless communication systems, detaching connections can lead to inconsistent state information between devices and network components, causing issues when reattaching, as existing methods may delete state information, resulting in inconsistent states and potential loss of gateway identifiers.
Innovation Solution
The method involves performing a handover of flows from one network connection to another instead of detaching, and transmitting a handover message to maintain state information, ensuring that the Home Subscriber Server (HSS) retains relevant information, including gateway identifiers, to facilitate seamless reattachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a connection is detached from the wireless network, then the device can switch to another network connection, but state information including gateway identifiers is deleted from network components, causing inconsistent states
Solution Approach 1:
The system performs flow handover to a different network connection before detaching the original connection. This preliminary action ensures that data flows are already redirected to the new connection, so when the original connection is detached and its state information is cleared, no service interruption or information loss occurs because the flows have already been migrated.
Solution Approach 2:
The patent introduces a handover message as an intermediary mechanism between the detach operation and the network components. This handover message carries flow context information and gateway identifiers, acting as a mediator that preserves critical state information during the transition from one network connection to another, preventing information loss even when the original connection's state is cleared.
2Loss of energy
If state information is cleared during detach, then network resources are released, but inconsistent states occur between device and network components upon reattachment
Solution Approach 1:
The system maintains continuity of useful action by performing flow handover before detach, ensuring that data flows continue uninterrupted on the new connection. The handover message preserves essential state information and gateway identifiers, allowing the device to reattach smoothly to the same or different gateway without state inconsistency, thus maintaining reliable continuous service while still releasing resources from the detached connection.
3Device complexity
If detach is performed without flow handover, then the process is simpler, but gateway identifiers are lost and reattachment fails or becomes incorrect
Solution Approach 1:
The system performs flow handover as a preliminary action before detach, pre-configuring the new connection with all necessary flow context and gateway information. This preliminary setup ensures that when detach occurs and state information is cleared, the device already has the correct gateway identifiers and flow states preserved in the handover message, enabling accurate reattachment without increasing overall system complexity.
Data Source
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AI summary
Methods and apparatuses are provided that facilitate detaching one of a plurality of network connections to ensure state information is retained at one or more network nodes. For a device initiated detach, the device can transmit a handover message related to performing a handover of one network connection to another active network connection, as opposed to explicitly detaching the network connection. This can cause at least some state information, such as a gateway identifier, to be retained in one or more network nodes. For a network initiated detach, a gateway can provision state information to a state information server following receiving a routing tunnel termination message to ensure state information deleted as a part of the detach is re-provisioned to the state information server.