UE Mobility Management in Heterogeneous Networks
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Solution Overview
Problem
In LTE/LTE-advanced wireless mobile communications systems, frequent handovers in heterogeneous networks and dense small cell deployments lead to significant handover signaling overhead and radio resource wastage for user equipment (UE) in connected states that do not need to transmit data.
Innovation Solution
A mobility management method where a UE in a connected state enters a low consumption state, storing its connection context and performing cell camping based on cell reselection criteria during movement, reducing the need for continuous measurement and reporting, and allowing the base station to release resources when conditions are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing handover procedure is used in heterogeneous networks and dense small cell deployments, then the UE maintains connected state and can transmit data, but the UE needs to continuously perform measurement and reporting which causes large handover signaling overhead and wastes radio resources
Solution Approach 1:
The UE autonomously determines whether to enter idle state based on data transmission status, and independently manages mobility through cell reselection without continuous network control. The UE serves itself by making mobility decisions without triggering handover procedures, thereby reducing signaling overhead while maintaining the ability to resume data transmission when needed.
2Stability of the object's composition
If the UE frequently hands over in connected state during movement in heterogeneous networks, then the UE maintains service continuity, but the handover signaling overhead increases significantly
Solution Approach 1:
The patent extracts the mobility management function from the handover procedure by allowing the UE to enter idle state and perform cell reselection independently. This separates the mobility decision-making process from the handover signaling process, eliminating the need for continuous measurement reporting and handover requests while maintaining service continuity through rapid context retrieval when data transmission is needed.
3Loss of energy
If the UE enters idle state to reduce signaling overhead, then radio resources are conserved, but the UE cannot send data without switching to connected state first
Solution Approach 1:
The network pre-configures the UE with idle state parameters and cell reselection criteria before the UE enters idle state. This preliminary configuration enables the UE to autonomously manage mobility without continuous network interaction, conserving radio resources while maintaining the capability to quickly resume data transmission by switching back to connected state when needed, with pre-established context information accelerating the transition.
Data Source
AI summary
Embodiments of the present disclosure disclose a mobility management method, user equipment, a storage node, and a base station. The mobility management method may include: determining, by user equipment (UE) in a connected state, a source identifier of the UE, where the source identifier is used to identify the UE; allowing the UE to enter a low consumption state after a low consumption activation condition is met, where in the low consumption state, the UE stores a connection context of the UE in the connected state and performs cell camping based on a cell reselection criterion in a moving process; and reporting, by the UE when a first preset condition is met, 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.