Inter-Donor CU Mapping for IAB Service Continuity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current communication standards do not provide a solution for ensuring service continuity of a terminal in an inter-donor-CU migration scenario in integrated access and backhaul networks.
Innovation Solution
A communication method involving a first central unit of a first donor node determining a mapping and sending it to a second central unit of a second donor node, enabling route and bearer selection for downlink data to ensure uninterrupted service continuity during inter-donor-CU migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If inter-donor-CU migration is implemented to improve network flexibility and load balancing, then network adaptability is improved, but service continuity of terminal cannot be ensured due to lack of standard definition
Solution Approach 1:
The source donor-CU performs preliminary actions by determining the first mapping (route mapping and/or bearer mapping) before the IAB node completes migration to the target donor-CU. This mapping is sent to the target donor-CU in advance, ensuring that when data transmission switches to the target donor-CU, the terminal can immediately receive data through the pre-configured route without service interruption.
Solution Approach 2:
The first mapping acts as an intermediary mechanism between the source donor-CU and target donor-CU during inter-donor-CU migration. It carries the necessary route and bearer configuration information from the source to the target, enabling seamless handover of data transmission while maintaining service continuity for the terminal.
2Reliability
If route and bearer mapping information is shared between donor-CUs during migration, then service continuity is ensured, but network complexity increases due to additional signaling and coordination
Solution Approach 1:
The patent extracts only the essential mapping information (route mapping and/or bearer mapping) that is necessary for maintaining service continuity during migration. By taking out only the critical configuration data rather than sharing all network state information, the solution ensures service continuity while minimizing the additional signaling overhead and coordination complexity between donor-CUs.
Data Source
AI summary
In a communication system, a first central unit (CU) of a first donor node determines a first mapping that comprises a route mapping or a bearer mapping. The route mapping is between the downlink data and a downlink transmission path. The bearer mapping is between the downlink data and a downlink transmission bearer. The downlink transmission path includes a transmission path between the first CU and a target node of the downlink data through a second DU of a second donor node. The downlink transmission bearer includes a RLC channel between the second DU and a next-hop node of the second DU. The first CU then sends the first mapping to a second CU of the second donor node, and sends downlink data to the second DU of the second donor node.