Mobile Device Combined Attach Procedure PS Domain Registration
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Solution Overview
Problem
In mobile communication networks, the combined attach or Routing Area Update (RAU) procedure often fails to register devices to both Circuit-Switched (CS) and Packet-Switched (PS) domains simultaneously, leading to increased PS signaling congestion due to repeated retries for CS domain services.
Innovation Solution
A mobile communication device and method that perform a combined attach or RAU procedure successfully for PS domain services only, by transmitting an attach or RAU request message, receiving a reject cause for CS domain services, and prohibiting further retries to avoid PS domain congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station keeps retrying the combined attach or RAU procedure to obtain CS domain services, then the CS domain service registration may eventually succeed, but the PS signaling congestion increases due to repeated retries
Solution Approach 1:
The patent segments the combined attach/RAU procedure into two independent parts: PS domain registration and CS domain registration. When PS domain registration succeeds but CS domain registration fails (indicated by reject cause), the device separates these procedures by prohibiting retries of the combined procedure for CS services. Instead, the device performs a standalone Location Update procedure for CS domain services, thereby preventing additional PS signaling congestion while still achieving CS domain service registration.
2Productivity
If the mobile station performs a combined attach or RAU procedure for both CS and PS domains simultaneously, then signaling efficiency is improved, but the procedure may fail for CS domain services while succeeding for PS domain services, leading to unnecessary retries
Solution Approach 1:
The patent divides the combined attach/RAU procedure into separate PS domain registration and CS domain registration operations. When the device receives an attach accept or RAU accept message with a reject cause for CS domain services, it immediately prohibits further retries of the combined procedure for CS services. The device then performs a standalone Location Update procedure for CS domain services, eliminating unnecessary retries and reducing time loss while maintaining the signaling efficiency benefits of the combined procedure for PS services.
Data Source
AI summary
A communication device is provided with a wireless module and a controller module. The wireless module performs wireless transceiving to and from a service network. The controller module performs a combined attach or RAU procedure by transmitting an attach or RAU request message to the service network via the wireless module, and receives an attach or RAU accept message for the combined attach or RAU procedure, which includes a reject cause for CS domain services, from the service network via the wireless module. Also, the controller module prohibits retrying the combined attach or RAU procedure to obtain the CS domain services, in response to the attach or RAU accept message including the reject cause for the CS domain services.