Bi-layered Mobility for ng-ran Distributed Units
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Solution Overview
Problem
Current cellular communication systems face challenges in efficiently managing serving cell changes between cells within the same or different distributed units in 5G networks, leading to increased computational burden and resource usage, particularly in distributed cloud deployments.
Innovation Solution
Implementing a bi-layered mobility approach where intra-DU mobility is handled by the distributed unit and inter-DU mobility is managed by the central unit, using a mapping between physical cell identifiers and group identifiers to determine the appropriate unit for handling serving cell changes, thereby reducing the computational load on the central unit and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the central unit handles all serving cell changes uniformly, then mobility management is simplified, but computational burden and resource usage increase significantly
Solution Approach 1:
The patent segments mobility management into two layers: intra-DU mobility handled by distributed units and inter-DU mobility handled by the central unit. This segmentation reduces the computational burden on the central unit while maintaining simplified mobility management through clear responsibility division.
Solution Approach 2:
The patent introduces a hierarchical dimension to mobility management by distinguishing between intra-DU and inter-DU mobility scenarios. This dimensional separation allows different handling mechanisms for different types of mobility events, optimizing resource allocation.
2Device complexity
If the central unit manages all mobility events, then control is centralized and simplified, but resource allocation efficiency decreases
Solution Approach 1:
The patent segments control responsibilities between distributed units and central unit based on mobility type. Distributed units handle intra-DU mobility independently, while the central unit manages inter-DU mobility, improving resource allocation efficiency without complicating the overall control structure.
Solution Approach 2:
Distributed units autonomously handle intra-DU mobility events without requiring central unit intervention. This self-service capability improves resource allocation efficiency by allowing local decision-making while maintaining centralized control for inter-DU mobility.
3Loss of time
If distributed units handle all mobility decisions locally, then response time is reduced, but coordination between distributed units and central unit becomes complex
Solution Approach 1:
The patent segments mobility decision-making based on scope: distributed units make local decisions for intra-DU mobility (reducing response time), while the central unit coordinates inter-DU mobility. This segmentation reduces coordination complexity by limiting communication to only when necessary.
Solution Approach 2:
The central unit acts as an intermediary for inter-DU mobility coordination, providing a clear interface between distributed units and the core network. This intermediary role simplifies coordination mechanisms by centralizing inter-DU communication requirements.
Data Source
AI summary
Improved techniques of intra and inter distributed unit mobility include determining, by a user equipment served by a source cell, whether a target cell belongs to the same distributed unit as the source cell based on information sent by the central unit (control plane) after a connection with the network node has been established. The information sent by the network node includes, for each cell, a group identifier identifying the distributed unit with which that cell is associated. When measurement data provided by the user equipment indicates readiness for a serving cell change to a target cell, the user equipment uses the group identifier to determine whether the target cell belongs to the same distributed unit as the source cell (intra-distributed unit mobility scenario) or a different distributed unit as the source cell (inter-distributed unit mobility scenario).