RRC Release Redirect for Fast 5G SA Return After Voice Fallback
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Solution Overview
Problem
In 5G networks, after voice fall back to LTE, devices often remain in NSA mode due to intermittent data applications, preventing immediate return to 5G SA mode, which negatively impacts user experience by limiting access to new services and increasing power consumption.
Innovation Solution
Implementing a method that triggers a rapid 'Radio Resource Control (RRC) Release and Redirect' procedure after voice calls, allowing devices to immediately return to 5G SA mode by evaluating their capabilities and selecting the most suitable advanced network band based on priority, even if data transmission is ongoing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voice fall back to LTE is implemented, then voice service compatibility is improved, but device remains in NSA mode preventing immediate return to 5G SA mode
Solution Approach 1:
The patent applies preliminary action by pre-configuring release and redirect parameters in the network device before voice call completion. When the voice call ends, the device immediately executes the pre-prepared RRC release and redirect procedure, allowing rapid transition from LTE back to 5G SA mode without waiting for data applications to terminate, thus resolving the contradiction between voice service compatibility and access to new 5G services.
2Duration of action of moving object
If device remains in NSA mode due to intermittent data applications, then data transmission continuity is improved, but power consumption increases
Solution Approach 1:
The patent extracts the data transmission function from the control plane by allowing RRC connection to be released while maintaining data bearers in the user plane. This separation enables the device to transition control to LTE for voice services while keeping data transmission active in the background, then rapidly return to 5G SA mode after voice call completion, reducing power consumption while maintaining data continuity.
3Speed
If rapid RRC Release and Redirect procedure is implemented, then return to 5G SA mode speed is improved, but network control complexity increases
Solution Approach 1:
The patent reduces network control complexity by applying preliminary action - all release and redirect parameters are pre-configured in the network device before the voice call. When the call ends, the pre-prepared procedure is automatically executed without requiring complex real-time decision-making or additional signaling exchanges, thus achieving rapid return to 5G SA mode while keeping network control simple.
4Productivity
If maximum time on 5G SA network is achieved, then user experience is improved, but voice service compatibility may be compromised
Solution Approach 1:
The patent applies segmentation by separating voice service handling from data transmission. Voice services are handled on LTE network ensuring compatibility and reliability, while data transmission continues on 5G SA network maximizing productivity and user experience. The RRC connection is released for voice control but data bearers are maintained, allowing devices to spend maximum time on 5G SA while voice calls are properly managed on LTE.
Data Source
AI summary
Facilitating fast return to stand alone advanced networks (e.g., 5G, 6G, and beyond) after voice fall back is provided herein. Operations of a method can comprise receiving, from a first network device and by a second network device, a connection request that comprises an indication of a fall back procedure. The fall back procedure can be an “RRC release and redirect” or an “IRAT Handover.” The method also can comprise facilitating control of the voice communication for the mobile device and triggering a release of the control of the mobile device from the second network device based on a determination that the voice communication has completed. The fast return procedure can be either a “RRC release and redirect’ or an “IRAT handover.” Further, the method can comprise redirecting the mobile device to a third network device selected based on a capability of the mobile device.