Conditional Reconfiguration for 5G Cell Level Mobility
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Solution Overview
Problem
The 5G communication system faces challenges in cell level mobility due to the introduction of new services like network energy saving and non-terrestrial networks, which require enhanced conditional reconfiguration to manage changes in network nodes covering geographical areas over short periods.
Innovation Solution
The method involves receiving a Radio Resource Control (RRC) reconfiguration message, determining the execution conditions for conditional reconfiguration, and executing it based on physical layer control information or downlink pathloss reference, with the uplink determined by the RRC reconfiguration message parameters, and transmitting a RRC reconfiguration complete message in either the first or second uplink.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conditional reconfiguration is enhanced to manage network node changes, then adaptability is improved, but device complexity increases
Solution Approach 1:
The terminal receives and stores multiple RRC reconfiguration messages with different execution conditions in advance (e.g., different target cells for different geographic areas or time periods). When mobility is needed, the terminal simply evaluates which pre-configured message's conditions are met and executes it, avoiding real-time complex decision-making and reducing instantaneous processing complexity while maintaining high adaptability to network changes.
2Reliability
If cell level mobility management is improved, then reliability is improved, but loss of time increases
Solution Approach 1:
Multiple RRC reconfiguration messages are prepared and stored in advance with different execution conditions (e.g., different target cells for different geographic areas). When mobility is triggered, the terminal evaluates the conditions and executes the appropriate pre-configured message immediately, avoiding time-consuming real-time negotiation and ensuring reliable connectivity during network node changes.
Solution Approach 2:
The terminal autonomously evaluates execution conditions (such as geographic area or time period conditions) and independently determines which RRC reconfiguration message to execute without requiring continuous network control. This self-service capability reduces signaling time and ensures rapid, reliable mobility execution while maintaining network reliability.
Data Source
AI summary
A method and apparatus to support cell level mobility is provided. Method for supporting cell level mobility includes receiving a first Radio Resource Control (RRC) reconfiguration message, determining that execution condition of the conditional reconfiguration to the first cell is fulfilled, executing the conditional reconfiguration to the first cell based on the second RRC reconfiguration message, determining an uplink between a first uplink and a second uplink and transmitting based on the determination a RRC reconfiguration complete message in the first uplink or in the second uplink. The uplink is determined based on a physical layer control information of the first cell in case that the second RRC reconfiguration message comprises a first set of parameters. The uplink is determined based on reception power of downlink pathloss reference of the first cell in case that the second RRC reconfiguration message does not comprise the first set of parameters.