Cell Reselection in RRC Inactive State for 5G Load Distribution
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Solution Overview
Problem
The existing inter frequency redistribution in 5G mobile communication systems does not effectively consider the RRC inactive state, leading to suboptimal functioning of load distribution between carrier frequencies.
Innovation Solution
A cell reselection method that transitions a user equipment from an RRC connected state to an RRC inactive state upon receiving a network message, allowing it to select a redistribution target with the highest priority within the configured RAN notification area based on broadcast redistribution parameters, thereby enabling efficient inter frequency redistribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inter frequency redistribution is implemented without considering RRC inactive state, then load distribution between carrier frequencies can be achieved, but the redistribution function does not work properly for user equipments in RRC inactive state
Solution Approach 1:
The patent makes the cell reselection behavior dynamic by introducing a flag that can be configured by the network. When the flag is set, user equipments in RRC inactive state are triggered to perform cell reselection to redistribution target frequencies, enabling adaptive load distribution across different RRC states based on network conditions
Solution Approach 2:
The patent changes the parameter of cell reselection priority by introducing a specific flag configuration. This parameter change enables user equipments to transition from static cell reselection behavior to dynamic behavior where they can be triggered to reselect to redistribution target frequencies while in RRC inactive state
2Measurement precision
If user equipments continuously monitor all cells for redistribution opportunities, then optimal cell selection can be achieved, but power consumption and processing load increase significantly
Solution Approach 1:
The patent implements periodic action by triggering cell reselection only at specific moments when the user equipment is in RRC inactive state and a flag is configured. This periodic triggering mechanism allows the network to control when redistribution occurs, reducing continuous monitoring requirements while maintaining effective load distribution
Solution Approach 2:
The patent enables self-service by allowing user equipments to autonomously perform cell reselection to redistribution target frequencies when triggered by the network flag during RRC inactive state. The user equipment uses stored configuration information and broadcast parameters to independently determine and execute the reselection without continuous network control
Data Source
AI summary
A cell reselection method is a method that allows a user equipment to perform cell reselection of reselecting a cell to be used as a serving cell. The cell reselection method includes: transitioning from an RRC connected state to an RRC inactive state when a message is received from a network, the message including a configuration of a RAN notification area in which paging for the user equipment is performed; and after the transitioning to the RRC inactive state, selecting, among cells included in the RAN notification area, a redistribution target configured with a highest priority in the cell reselection, based on the RAN notification area configured according to the message and a redistribution parameter broadcast from the network.