Correlated Context Transfer for IAB Relay Handover
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In integrated access and backhaul (IAB) networks, existing technologies face challenges in efficiently transferring context between nodes during handover procedures, leading to potential loss of communication with downstream devices and increased system latency.
Innovation Solution
A method where a first donor node transmits correlated context transfer requests for a relay node and its child nodes to a second donor node, including identifiers to establish a relationship, allowing seamless handover without losing communication with descendant nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate context transfer requests are transmitted for relay node and child nodes, then individual context transfers can be managed, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent combines multiple context transfer requests (relay node and child nodes) into a single aggregated request message. The donor node generates one handover request that includes context information for both the relay node and its child nodes, reducing the number of separate signaling exchanges while ensuring all context transfers are processed together, thus reducing complexity without sacrificing reliability
2Loss of information
If context transfer requests are transmitted without correlation indication, then processing is simpler, but the receiving node cannot establish relationships between transferred devices
Solution Approach 1:
The patent uses identifier copying to establish device relationships. A correlation identifier is copied from the relay node's context transfer request and embedded in the child nodes' context transfer requests. This allows the receiving donor node to recognize and establish the parent-child relationship between transferred devices by matching these copied identifiers, preserving relationship information without requiring complex explicit signaling
3Speed
If handover is performed without correlated context transfer, then faster execution is possible, but communication continuity with downstream devices is lost
Solution Approach 1:
The patent performs preliminary aggregation of context transfer requests before executing the handover. The donor node prepares and transmits a single aggregated context transfer request that includes all necessary information for both the relay node and child nodes before the actual handover occurs. This preliminary action ensures that all context transfers are coordinated and executed together, maintaining communication continuity while enabling fast handover execution
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. a first donor node may serve a relay node, which in turn may serve a child node. The first donor node may determine to transfer (e.g., via a handover procedure) the relay node to a second donor node. The first donor node may transmit a first context transfer request for the relay node to the second donor node, and may transmit a second context transfer request for the child node of the relay node to the second donor node. The first donor node may indicate a correlation between the two context transfers. The second donor node may identify the correlated context transfers, and may successfully perform a migration procedure for the relay node and any descendent devices or nodes based on the correlated context transfers.