IAB Node Inter-Donor Migration Data Forwarding
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Solution Overview
Problem
Current wireless communication systems face challenges in managing user equipment (UE) connections during network topology changes, particularly during inter-donor migration in integrated access and backhaul (IAB) networks, where signaling and context management are unclear, especially when radio link failures occur.
Innovation Solution
The system enables inter-donor migration of IAB-nodes and UE by facilitating the exchange of data packets between the source and target IAB-donors, with the source donor encrypting downlink data and transmitting it via the target donor, and vice versa, to maintain continuous communication with the core network during topology changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inter-donor migration is performed during radio link failure, then connection continuity is improved, but signaling complexity increases
Solution Approach 1:
The source donor performs data forwarding and context transfer to the target donor before the UE completes its connection reestablishment. This preliminary action ensures that data paths are prepared in advance, allowing the UE to resume communication without interruption despite the radio link failure, thus improving connection continuity while managing signaling complexity through proactive preparation.
Solution Approach 2:
The source donor acts as an intermediary by forwarding data packets to the target donor through the core network or direct interface. This intermediary role allows seamless data transfer during the migration process, maintaining connection continuity while abstracting the complexity from the UE side, as the UE only needs to reestablish connection without managing complex data routing.
2Reliability
If data forwarding is performed during migration, then data transmission continuity is improved, but network latency increases
Solution Approach 1:
Data forwarding is initiated immediately when the source donor detects the need for migration, before the UE experiences any service interruption. By preparing data paths and forwarding buffers in advance, the system minimizes the actual data transmission delay during migration, maintaining continuity while reducing the perceived latency impact on user experience.
Solution Approach 2:
The data forwarding mechanism ensures continuous data transmission from source to target donor without breaking the data flow. By maintaining active data paths and using buffer management during the transition, the system preserves useful action continuity, allowing data to flow seamlessly through the migration process with minimal interruption and acceptable latency.
3Productivity
If context transfer is performed before connection reestablishment, then migration speed is improved, but signaling overhead increases
Solution Approach 1:
The source donor transfers UE context information to the target donor before the UE completes its connection reestablishment procedure. This preliminary context transfer enables the target donor to be fully prepared to serve the UE immediately upon connection resumption, accelerating migration speed. The signaling overhead is managed by performing this transfer efficiently through existing donor interfaces rather than through the air interface.
Solution Approach 2:
The core network or direct donor interface serves as an intermediary channel for context transfer, separate from the UE air interface. This allows context information to be exchanged between donors using optimized signaling paths, reducing the signaling overhead on the radio interface while maintaining fast migration speed. The intermediary channel handles the bulk of context transfer traffic efficiently.
Data Source
AI summary
A source donor, for managing a connection between a user equipment (UE) and a radio access network (RAN) via an integrated access backhaul (IAB)-node, (i) determines (2002), when the IAB-node communicates with the RAN via the source donor, that the IAB-node is to migrate from the source donor to establish a new radio connection with the RAN, and (ii) subsequently to the determining and prior to the UE and the IAB-node establishing respective new connections with the RAN, facilitates (2004) exchange of data between the UE and a core network (CN) via the source donor and the target donor.