IAB Node Handover Command Suspension for Seamless UE Service
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Solution Overview
Problem
In mobile communication systems, handovers of relay apparatuses between different donor apparatuses can disrupt communication with lower apparatuses, such as user equipment, making it difficult to ensure backward compatibility and synchronizing handover procedures.
Innovation Solution
A handover control method where the first donor apparatus transmits a handover command to the relay apparatus, which suspends its transfer to the lower apparatus until the relay apparatus completes its handover, then transfers the command, allowing synchronous handover of the relay and user equipment, thus preventing communication disruption and ensuring backward compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the relay apparatus immediately forwards handover commands to lower apparatuses, then the handover process is fast, but communication disruption occurs during relay apparatus handover
Solution Approach 1:
The relay apparatus suspends forwarding of handover commands to lower apparatuses before its own handover is completed. This preliminary suspension action prevents the lower apparatuses from handovering to a new donor apparatus before the relay apparatus has successfully switched, thereby avoiding communication disruption while maintaining fast handover execution
Solution Approach 2:
The relay apparatus applies preliminary anti-action by blocking the transmission of handover commands during its handover process. This counter-action prevents the harmful effect of communication disruption that would occur if lower apparatuses handovered independently without waiting for the relay apparatus to complete its handover
2Reliability
If the relay apparatus waits for handover completion before forwarding commands, then communication continuity is maintained, but handover process time increases
Solution Approach 1:
The suspension of handover command forwarding is implemented as a preliminary action that automatically ends when the relay apparatus completes its handover. This ensures communication continuity during the critical handover period while minimizing the time delay, as the suspension is lifted immediately upon handover completion
Solution Approach 2:
The forwarding behavior of handover commands is made dynamic - it is suspended during handover and automatically resumed after handover completion. This dynamic adjustment optimizes the balance between maintaining communication continuity and minimizing handover process time, adapting the system behavior to the current operational state
3Stability of the object's composition
If handover commands are suspended during relay handover, then synchronous handover is achieved, but device complexity increases
Solution Approach 1:
The system uses preliminary actions (suspension and resumption of command forwarding) that are triggered by clear events (handover start and completion). This event-driven approach achieves synchronous handover without requiring complex coordination protocols, as the suspension and resumption are automatically managed based on handover state changes
Solution Approach 2:
The relay apparatus autonomously manages the suspension and resumption of handover command forwarding based on its own handover state. This self-service mechanism achieves handover synchronization without requiring additional complex control signaling between network entities, as the relay apparatus itself controls the timing of command forwarding
Data Source
AI summary
A first donor apparatus 200S transmits to the UE 100 a first handover command indicating a handover of a UE 100 (lower apparatus) lower than an IAB node 300. The IAB node 300 receives the first handover command addressed to the UE 100, and then suspends transfer of the first handover command to the UE 100 until a handover of the IAB node 300 is performed.