IAB Donor CU Trigger for Inter-Donor Topology Adaptation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently adapting inter-donor topology in wireless networks, leading to signaling storms and increased overhead during migration processes, which affect network efficiency and user equipment (UE) connectivity.
Innovation Solution
A method is introduced where a source integrated access and backhaul (IAB) donor central unit (CU) transmits a trigger and transport network layer (TNL) address information to an IAB node to establish a second signaling connection with a target IAB donor CU, allowing gradual inter-donor migration and reducing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional migration methods are used in wireless networks, then topology adaptation can be achieved, but signaling storms and increased overhead occur during migration processes
Solution Approach 1:
The migration process is segmented into multiple phases: preparation phase where TNL address information is pre-configured, execution phase where migration is triggered, and completion phase where connections are transferred. This segmentation prevents signaling storms by distributing signaling events across time rather than concentrating them in a single migration event.
Solution Approach 2:
TNL address information is pre-configured and stored in the IAB node before the actual migration occurs. The source IAB donor CU provides the target TNL address in advance, so that when migration is triggered, the IAB node can immediately establish the new connection without generating excessive signaling traffic during the migration event itself.
2Adaptability or versatility
If migration is performed to adapt inter-donor topology, then network flexibility improves, but processing loads on source and target IAB donor CUs increase
Solution Approach 1:
The complex migration logic and processing load are extracted from the IAB node and placed in the source IAB donor CU. The source CU manages the entire migration process including providing TNL address information, triggering migration, and coordinating with the target CU, thereby reducing processing burden on individual nodes and distributing the load more efficiently across the system.
3Reliability
If signaling connections are established during migration, then connectivity is maintained, but network efficiency decreases due to increased signaling overhead
Solution Approach 1:
The source IAB donor CU acts as an intermediary that coordinates the establishment of the new signaling connection with the target IAB donor CU before the actual migration occurs. By pre-configuring TNL address information and managing the connection establishment process, the source CU ensures seamless connectivity while minimizing the duration and impact of signaling overhead on network efficiency.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a source integrated access and backhaul (IAB) donor central unit (CU) may transmit, to an IAB node having a first signaling connection with the source IAB donor CU, a trigger to establish a second signaling connection between the IAB node and a target IAB donor CU. The source integrated access may transmit, to the IAB node, transport network layer address information associated with the target IAB donor CU to enable the IAB node to establish the second signaling connection with the target IAB donor CU. The IAB node may transmit, to the target IAB donor CU, a request to establish the second signaling connection with the target IAB donor CU based at least in part on the trigger. Numerous other aspects are provided.