Cell Identity Mapping for Seamless IAB Handover
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Solution Overview
Problem
In the context of new radio (NR) Integrated Access and Backhaul (IAB) systems, there is a challenge in managing cell identities during handovers between IAB nodes, particularly when an IAB node changes its parent node due to backhaul failures or topology changes, as the correlation between NR Cell Identity (NCI) and gNB ID requires different NCI usage, leading to complexities in maintaining connectivity and service continuity.
Innovation Solution
The solution involves a method where a source device obtains identity information of a target device and mapping from old cell identity to new cell ID, allowing for seamless handover by determining the target cell ID without interrupting service, using a communication system with devices configured to transmit and receive identity information and allocate new cell identities, ensuring continuous connectivity during inter-donor topology adaptation or mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an IAB node changes its parent node due to backhaul failures or topology changes, then connectivity can be maintained through handover, but cell identity management becomes complex and service continuity is disrupted
Solution Approach 1:
The target IAB node performs preliminary actions by pre-allocating new cell identities and preparing handover parameters before the actual handover occurs. The source IAB node retrieves mapping relationships between old and new cell identities in advance, enabling seamless transition without service disruption while managing the complexity of identity transformation.
Solution Approach 2:
The patent introduces an intermediary mechanism using identity mapping relationships as a bridge between source and target IAB nodes. This mapping relationship acts as a mediator that translates old cell identities to new cell identities, simplifying the handover process and maintaining service continuity without requiring direct complex coordination between all nodes.
2Measurement precision
If different NCI are used for different parent nodes, then proper identification can be maintained, but handover processes become more complex and time-consuming
Solution Approach 1:
The system performs preliminary allocation of new cell identities at the target node and pre-establishes mapping relationships between old and new identities. This allows the source node to retrieve and apply the correct mapping during handover, eliminating the need for time-consuming identity resolution in the middle of the handover process and reducing overall handover time while maintaining identification accuracy.
Solution Approach 2:
The patent implements feedback mechanisms where the source IAB node retrieves mapping information from the target IAB node about the relationship between old and new cell identities. This feedback loop enables the source node to accurately translate identities during handover, ensuring proper identification while accelerating the handover process by avoiding repeated identity resolution.
3Adaptability or versatility
If cell identities are reallocated during handover, then new topology can be adapted, but service continuity is interrupted and user experience deteriorates
Solution Approach 1:
The target IAB node performs preliminary allocation of new cell identities for the handover target cell before the actual handover occurs. The source node retrieves the mapping relationship between old and new identities in advance, allowing the network to adapt to new topology through identity reallocation while maintaining service continuity by pre-preparing the transition.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining the logical connection between old and new cell identities through mapping relationships. The handover process continues seamlessly as the source node translates existing cell identities to new ones using pre-retrieved mapping information, preventing service interruption while enabling topology adaptation.
Data Source
AI summary
Embodiments of the present disclosure relate to mechanism for cell identity management. According to embodiments of the present disclosure, a source device obtains identity information of a target device. The source device further obtains mapping from old cell ID to new cell ID for a migrating device and descendant devices of the migrating device. The mapping information receives from the target device or the migrating device. In this way, the device may be migrated to the target device without interrupting services of the terminal device which connects to the device.