UE State Transition Handling for Cellular Data Loss Prevention
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Solution Overview
Problem
In radio network communication, data loss occurs due to inconsistencies in the state transition from CELL-PCH to CELL-FACH states, as the radio network controller may continue transmitting data based on the older state, unaware of the actual state change, leading to data loss during the shorter DRX period in the CELL-FACH state.
Innovation Solution
The UE receives the scheduling control channel continuously or simultaneously according to both DRX mechanisms of CELL-FACH and CELL-PCH states until receiving an indication of normal reception, and then informs the radio network controller of the state transition, ensuring data is received correctly after the transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transits from CELL-PCH state to CELL-FACH state and the radio network controller maintains the old state, then the radio network controller can continue transmitting data based on the stored state, but data loss occurs because the UE is in a different actual state
Solution Approach 1:
The patent implements a feedback mechanism where the UE sends state transition information to the radio network controller to notify it of the state change. This feedback loop ensures the controller updates its stored state to match the actual UE state, preventing data loss while maintaining reliable data transmission.
2Reliability
If the UE receives the scheduling control channel continuously or according to both DRX mechanisms during state transition, then data integrity is maintained, but the UE must manage complex reception timing coordination
Solution Approach 1:
The patent applies preliminary action by having the UE receive the scheduling control channel continuously or according to both DRX mechanisms during the state transition period before the radio network controller updates its state. This advance reception of scheduling information ensures data integrity is maintained during the transition without requiring complex real-time coordination.
Data Source
AI summary
The present invention relates to a method, system and UE for state transition. The method includes: after a transition from the CELL-PCH state to the CELL-FACH state, a UE receives the scheduling control channel continuously, or receives simultaneously the scheduling control channel according to the receiving time corresponding to the DRX mechanism when the UE is in the CELL-FACH state and the receiving time corresponding to the DRX mechanism when the UE is in the CELL-PCH state; after obtaining an indication of normal reception, the UE receives the scheduling control channel according to the receiving time corresponding to the DRX mechanism when the UE is in the CELL-FACH state; the radio network controller has be informed that the UE has transited from the CELL-PCH state to the CELL-FACH state simultaneously when the UE obtains the indication of normal reception, so as to avoid data loss in a certain period after the state transition of the UE.