UE Retry Timer Coordination for Network Congestion
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Solution Overview
Problem
User equipment (UE) experiences increased network congestion when attempting to reestablish communication with a primary network after a failure, as it loses retry timer information when switching to a secondary network, leading to immediate retries without considering the retry timer, exacerbating congestion.
Innovation Solution
The UE manages communication links by starting a first retry timer in the primary network communication module and sending its value to a secondary network module, which then starts a second retry timer. If the secondary network establishes a connection before the second timer expires, a success message is sent back. If not, the primary module sends a connection request after its timer expires or aborts the secondary network attempt if no message is received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE immediately retries to establish communication with the first network after a connection failure, then the connection establishment speed is improved, but network congestion increases
Solution Approach 1:
The patent applies preliminary action by starting a retry timer in the secondary network module before attempting connection to the secondary network. This timer is initialized with the value received from the primary network's retry timer, ensuring that the UE waits for the appropriate duration before retrying the primary network, thus preventing immediate retries that cause congestion while maintaining connection establishment speed through coordinated timing
2Reliability
If the UE switches to a secondary network upon primary network failure, then communication continuity is improved, but context information about retry attempts is lost
Solution Approach 1:
The patent uses the retry timer value as an intermediary information carrier between the primary and secondary network modules. When switching to the secondary network, the UE sends the retry timer value to the secondary network module, which uses this information to coordinate its connection attempts with the primary network's retry schedule, thereby preserving context information across network switches
Solution Approach 2:
The patent implements feedback by having the secondary network module send status updates back to the primary network module about connection attempts and outcomes. This feedback mechanism ensures that both modules have awareness of the current connection state and can coordinate their actions accordingly, preventing information loss during network switching
3Object-generated harmful factors
If the UE coordinates communication attempts between primary and secondary networks using retry timers, then network congestion is reduced, but device complexity increases
Solution Approach 1:
The patent applies universality by implementing a unified retry timer mechanism that operates across both primary and secondary network modules. The same retry timer logic and coordination protocol are used regardless of which network is being accessed, simplifying the overall system design while effectively reducing network congestion through coordinated attempts
Data Source
AI summary
Various aspects include methods for managing communication links with different networks. A user equipment (UE) processor may start a first retry timer in a first network communication module in response to receiving a connection reject message from a first communication network, send a value of the first retry timer to a second network communication module, start a second retry timer in the second network communication module based on the value of the first retry timer, send a service request from the second network communication module to a second communication network, and send a connection success message from the second network communication module to the first network communication module upon establishing a communication link with the second communication network before the second retry timer expires. The first communication network may be a terrestrial cellular network and the second communication network may be a satellite communication network.