RRC Inactive Mode Mobility via Area Update Mechanism
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Solution Overview
Problem
Current wireless communication systems lack a method to support mobility for user equipment (UE) set in a newly defined radio resource control (RRC) mode, particularly in scenarios with low or absent communication service load, leading to inefficiencies in signaling load and resource management.
Innovation Solution
A method and apparatus are provided to manage the mobility of UE in a newly defined RRC mode by defining a new area for mobility management and updating areas, minimizing signaling load through effective area updates, enabling seamless migration between areas while maintaining service quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a new RRC mode is defined to support low or absent communication service load, then energy efficiency and resource utilization are improved, but mobility management capability deteriorates due to lack of support
Solution Approach 1:
The network management area is segmented into multiple area identifiers, allowing the UE to be tracked across different geographic regions while in the new RRC mode. This segmentation enables mobility management without requiring full RRC connection establishment, thus maintaining energy efficiency while adding mobility support.
Solution Approach 2:
An area update mechanism is introduced as an intermediary between the UE in new RRC mode and the network. Instead of requiring full RRC connection for mobility events, the UE performs lightweight area updates through the new RRC mode, serving as a mediator that enables mobility management with reduced signaling overhead and energy consumption.
2Adaptability or versatility
If traditional RRC connected mode is used for UE mobility, then mobility management is supported, but signaling load increases
Solution Approach 1:
Instead of performing complete RRC connection establishment and full handover procedures for every mobility event, the invention implements partial action through area update mechanisms. The UE only signals essential location information when moving between area identifiers, reducing signaling load while maintaining mobility management capability.
Solution Approach 2:
The invention changes the state parameter of the RRC mode to a new mode that allows mobility management with reduced signaling. By transitioning from traditional RRC connected mode to the new RRC mode for specific scenarios, the system modifies operational parameters to achieve lower signaling load while maintaining necessary mobility support.
3Quantity of substance
If RRC idle mode is used to reduce signaling load, then signaling overhead is minimized, but mobility management and service continuity deteriorate
Solution Approach 1:
The network performs preliminary actions by configuring area identifiers and establishing area update mechanisms before the UE moves. This preliminary setup enables the UE to perform simple area updates instead of full service re-establishment during mobility, maintaining service continuity with minimal signaling overhead similar to RRC idle mode.
Data Source
AI summary
A wireless user device comprises at least one antenna, at least one processor, and memory storing instructions that cause the wireless user device to: receive first radio access network-based notification area (RNA) information, wherein the wireless user device is in a radio resource control (RRC) inactive mode; receive, from a base station, second RNA information different from the first RNA information, and an access barring threshold value, based on a difference between the first RNA information and the second RNA information and based on the access barring threshold value, determine that an RNA update indication is allowed, transmit, to the base station and based on determining that the RNA update indication is allowed, an RNA update indication message, receive an RNA update reject message responsive to the RNA update indication message, and after receiving the RNA update reject message and while a timer is running, start a cell reselection.