NAS Signal Connection Indication for Mobile Radio Re-attach
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Solution Overview
Problem
Current mobile radio communications systems experience delays in re-establishing network connections due to ambiguity in whether to use an existing or new NAS signalling connection during the re-attach process, leading to inefficiencies in re-establishing connections after network detachment or loss of session information.
Innovation Solution
A mobile radio communications network device and device that transmit or receive a NAS signal indicating whether to use an existing or new NAS signalling connection for re-establishment, thereby clarifying the connection method to reduce delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE waits for network release of existing NAS signalling connection before re-attach, then connection re-establishment reliability is improved, but re-attach time is increased
Solution Approach 1:
The patent implements dynamic behavior where the UE can switch between two re-attach modes: waiting for network release (higher reliability) and immediate re-attach using existing connection (faster). The network controls this dynamic selection by sending indication information in the reject message, allowing the system to adapt the re-attach strategy based on current network state and requirements.
Solution Approach 2:
The patent changes the parameter of connection usage by introducing an indication parameter in the reject message that specifies whether to use existing or new NAS signalling connection. This parameter change allows the network to control the re-attach behavior, switching between reliability-oriented and speed-oriented approaches based on operational conditions.
2Productivity
If the UE uses existing NAS signalling connection for re-attach, then re-attach speed is improved, but connection reliability is worsened due to potential network release
Solution Approach 1:
The patent implements dynamic behavior where the UE can switch between two re-attach modes: waiting for network release (higher reliability) and immediate re-attach using existing connection (faster). The network controls this dynamic selection by sending indication information in the reject message, allowing the system to adapt the re-attach strategy based on current network state and requirements.
Solution Approach 2:
The patent changes the parameter of connection usage by introducing an indication parameter in the reject message that specifies whether to use existing or new NAS signalling connection. This parameter change allows the network to control the re-attach behavior, switching between reliability-oriented and speed-oriented approaches based on operational conditions.
3Productivity
If the network releases existing NAS signalling connection before receiving re-attach request, then resource efficiency is improved, but message delivery reliability is worsened
Solution Approach 1:
The patent applies preliminary action by having the network send indication information in the reject message about whether it plans to release the existing NAS signalling connection. This allows the UE to prepare appropriately in advance - either to wait for release or to proceed with immediate re-attach - preventing the scenario where the network releases the connection before receiving the re-attach request.
Solution Approach 2:
The patent implements feedback by including indication information in the reject message that informs the UE about the network's intended action regarding the existing connection. This feedback mechanism allows the UE to adjust its re-attach strategy accordingly, ensuring that re-attach requests are sent through appropriate channels and improving message delivery reliability.
Data Source
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AI summary
The present invention relates to a mobile radio communications network device operative to transmit a non-access stratum (NAS) signal to a mobile radio communications device after a failed attempt by said mobile radio communications device to access a mobile radio communications network via said network device, said network device being arranged to include within said NAS signal information indicating to said mobile radio communications device which one of: (i) an existing NAS signalling connection; or (ii) a new NAS signalling connection, said radio mobile communications device should employ to attempt re-establishment of connection with said network device. The present invention also relates to a NAS signal to be employed by such a network device, a mobile radio communications device for exchanging signalling with the network device and related methods of such devices.