Preconfigured Target Cell Configurations for Intra-DU Mobility
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Solution Overview
Problem
Current mobility management in cellular networks incurs significant signaling overhead and latency due to the conventional approach of configuring target cells via RRC protocol for intra-frequency cell changes, especially in distributed cloud deployments, where additional time is required for forwarding measurements and performing UE context modifications.
Innovation Solution
The proposed solution involves generating preconfigured target cell configurations for all intra-frequency cells by the gNB-CU-CP, reducing the need for subsequent F1:UE Context Modification and RRC Re-configuration procedures, and using delta configurations to minimize signaling overhead during intra-DU mobility events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If target cells are configured via RRC protocol for intra-frequency cell changes, then mobility management can be performed, but signaling overhead and latency increase significantly
Solution Approach 1:
The patent applies preliminary action by pre-configuring target cell configurations and storing them in the UE before mobility is needed. The gNB-CU-CP generates and provides target cell configurations in advance through F1 interface, so that when mobility is required, the UE can immediately switch cells without waiting for RRC reconfiguration procedures, thus reducing signaling latency while maintaining reliable mobility management
2Reliability
If conventional RRC reconfiguration procedures are used for each cell change, then target cell configurations can be provided, but signaling overhead to UE and F1 interface increases
Solution Approach 1:
The patent applies copying by creating and storing copies of target cell configurations in the UE beforehand. Instead of transmitting full RRC reconfiguration messages during each mobility event, the system uses pre-copied configurations that can be quickly activated. This reduces the quantity of signaling data transmitted over the air interface and F1 interface, while ensuring accurate target cell configurations are available when needed
Data Source
AI summary
Techniques of mobility events include generating, by a gNB-CU-CP, preconfigured target cell configurations for some or all intra-frequency cells of a gNB-DU which reduces the need for subsequent F1:UE Context Modification and RRC Re-configuration procedures to configure cells of the same DU for L1/L2 mobility. Advantageously, the above-described technique for intra and inter gNB-DU mobility provides for more efficient signaling between cells belonging to the same gNB-DU.