Stored UE Context for Low-Overhead Connected-Mode Mobility
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Solution Overview
Problem
Existing mobility management in wireless mobile communications systems, particularly in LTE/LTE-A networks, leads to high handover signaling overheads and radio resource waste due to frequent handovers of user equipment (UE) in connected mode without data transmission, especially in heterogeneous and dense small cell networks.
Innovation Solution
A mobility management method where a base station allocates a source identifier to a UE in connected mode, allowing it to enter a low-overhead state with stored connection context, and perform cell reselection, reducing the need for frequent handover procedures by storing and transferring the context when needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent handover procedures are performed for UE in connected mode during movement, then mobility management is maintained, but handover signaling overhead increases and radio resources are wasted
Solution Approach 1:
The patent extracts the connection context from the base station and stores it in the UE itself. This allows the UE to autonomously perform cell reselection without frequent handover signaling, while the base station only needs to transfer the pre-stored context when data transmission is required, thereby reducing signaling overhead while maintaining mobility management reliability
Solution Approach 2:
The base station performs preliminary action by storing the connection context in the UE before the UE actually needs to move to a new cell. This advance preparation enables the UE to quickly perform cell reselection without triggering frequent handover procedures, reducing both signaling overhead and maintaining reliable mobility management
2Loss of energy
If UE performs cell reselection autonomously in low-overhead state, then signaling overhead is reduced, but connection context transfer capability must be maintained
Solution Approach 1:
The patent introduces the source identifier as an intermediary element that enables the base station to identify and retrieve the UE's connection context without requiring complex signaling. The source identifier acts as a key that simplifies the context transfer mechanism, allowing efficient retrieval while maintaining low signaling overhead for autonomous cell reselection
Data Source
AI summary
Embodiments of the present disclosure disclose a mobility management method, user equipment, and a base station. The mobility management method may include: receiving, by user equipment UE in a connected mode, a source identifier of the UE from a first base station, where the source identifier is used to uniquely identify the UE in the first base station; entering, by the UE, a low-overhead state after a low-overhead activation condition is satisfied, where in the low-overhead state, the UE stores a connection context of the UE in the connected mode, and camps on a cell according to a cell reselection criterion during movement; and reporting, by the UE when a first preset condition is satisfied, the source identifier to a second base station to which a second cell belongs, where the second cell is a serving cell on which the UE currently camps.