5GMM State Transition Handling After RRC Fallback
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Solution Overview
Problem
In conventional wireless communication systems, user equipment (UE) experiences inefficiencies during fallback to RRC establishment, leading to data loss and communication delays due to unnecessary processing steps and failure to transition back to the 5GMM-connected state after RRC connection reestablishment or resume procedures.
Innovation Solution
The UE transitions to a 5GMM-idle state upon fallback indication and then back to a 5GMM-connected state upon successful RRC connection reestablishment or resume, enabling data transmission and reception, and informs upper layers of lower-layer failures to prevent unnecessary processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs fallback to RRC establishment procedure, then the RRC connection can be reestablished, but the UE transitions to 5GMM-idle state causing communication delays and data loss
Solution Approach 1:
The patent applies preliminary action by having the UE send a service request or registration request message during the RRC setup complete message transmission, before the 5GMM state transition is finalized. This ensures that the network is already notified of the UE's presence and data transmission needs, eliminating the delay that would otherwise occur when transitioning to 5GMM-idle state and requiring a separate service request procedure later.
Solution Approach 2:
The patent maintains continuity of useful action by keeping the UE in 5GMM-connected state throughout the RRC fallback procedure rather than transitioning to 5GMM-idle. This allows the data session and mobility management context to be maintained continuously, enabling seamless data transmission without interruption or the need to re-establish the 5GMM connection after RRC reestablishment.
2Stability of the object's composition
If the UE transitions to 5GMM-idle state during fallback, then state synchronization is achieved, but unnecessary processing steps occur increasing complexity
Solution Approach 1:
The patent extracts the unnecessary 5GMM state transition step from the RRC fallback procedure. By removing the transition to 5GMM-idle state and the associated service request/registration procedures, the patent eliminates redundant processing while maintaining the essential RRC connection reestablishment function. The UE simply remains in or transitions directly to 5GMM-connected state, taking out the intermediate idle state that causes unnecessary complexity.
3Productivity
If the UE informs upper layers of lower-layer failure recovery, then data transmission is enabled, but additional signaling is required
Solution Approach 1:
The patent merges the failure recovery indication with the existing RRC setup complete message transmission. By combining the service request or registration request with the RRC setup complete message, the patent enables data transmission functionality while using already-necessary signaling resources. This merging approach avoids additional separate signaling messages that would otherwise be required to inform upper layers of recovery and initiate data transmission.
Data Source
AI summary
This document describes techniques and apparatuses for handling mobility management state transitions after fallback to radio resource control (RRC) establishment. In implementations, a user equipment UE transmits an RRC request to a network to initiate an RRC connection procedure. Afterward, the UE receives an RRC setup message from the network. The UE communicates, by an RRC protocol layer at the UE, an indication of the fallback to a fifth-generation mobility-management (5GMM) protocol layer at the UE. The UE then transitions the 5GMM protocol layer to a 5GMM idle state. In implementations, the UE then communicates, by the RRC protocol layer, an RRC connection-established indication to the 5GMM protocol layer, and transitions the 5GMM protocol layer to a 5GMM connected state to enable data transmission and reception with the network.