Configuring User Equipment for Lower Layer Inter-Cell Mobility
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Solution Overview
Problem
Existing communication systems face challenges in efficiently configuring user equipment for lower layer inter-cell mobility, particularly in cellular radio access networks where base station functionality is split between distributed and central units.
Innovation Solution
A method and apparatus for generating an information set for user equipment, which includes configuring it for performing measurements and making mobility decisions at a distributed unit operating a serving cell, as well as for operating in a second cell in case of a serving cell change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If base station functionality is split between distributed units and central units, then system flexibility and scalability are improved, but device complexity and coordination overhead increase
Solution Approach 1:
The base station functionality is segmented into distributed units (DU) and central units (CU), allowing independent configuration and management of each unit. The DU handles lower layer functions while the CU handles higher layer functions, enabling flexible deployment scenarios and reducing the complexity burden on any single component.
Solution Approach 2:
An intermediary interface is established between the DU and CU, and between the DU and UE, to manage information exchange and coordination. This intermediary layer standardizes communication protocols and reduces the complexity of direct peer-to-peer coordination between distributed components.
2Speed
If mobility decisions are made at the distributed unit level, then handover speed and responsiveness are improved, but measurement configuration complexity and information management increase
Solution Approach 1:
The DU pre-configures measurement parameters, measurement objects, and reporting configurations for the UE before mobility events occur. This preliminary setup includes defining which cells to measure, what thresholds to use, and how reports should be formatted, enabling rapid mobility decisions without complex real-time configuration changes.
Solution Approach 2:
The system dynamically adjusts measurement configuration parameters based on UE capability, service type, and current radio conditions. By changing parameters such as measurement bandwidth, reporting periodicity, and threshold values, the DU optimizes the balance between measurement accuracy and configuration complexity for different scenarios.
3Reliability
If comprehensive measurement information is collected for mobility decisions, then mobility decision accuracy is improved, but information processing load and signaling overhead increase
Solution Approach 1:
The DU implements partial measurement collection by focusing on the most critical measurement parameters and cells that are most likely to trigger handover. Instead of collecting all possible measurement data, the system selectively gathers information about neighboring cells meeting certain criteria, reducing processing load while maintaining sufficient accuracy for mobility decisions.
Solution Approach 2:
The system uses feedback mechanisms where the DU analyzes measurement reports from UEs and adjusts future measurement configuration based on observed mobility patterns and radio conditions. This feedback loop allows the system to learn which measurements are most valuable for accurate mobility decisions, reducing unnecessary information collection and processing overhead.
Data Source
AI summary
A technique, comprising: generating an information set for a user equipment; wherein the information set at least includes information for configuring the user equipment for performing measurements for a mobility decision at a first distributed unit operating a first, serving cell of a radio access network; wherein the measurements comprise at least: measurements for the first, serving cell, and measurements for a second cell operated by a second distributed unit of the radio access network.