Conditional Handover Control for Energy-Saving 5G Cells
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Solution Overview
Problem
Existing communication systems face challenges in managing seamless handovers and energy-efficient operations in high-speed mobility and high-frequency deployment scenarios, particularly in 5G networks, due to frequent handover failures and high power consumption.
Innovation Solution
Implementing conditional handover (CHO) and conditional PSCell change (CPC) processes with network status and energy-saving considerations, including HO configuration information that accounts for network energy-saving (NES) states and conditions, allowing terminal devices to perform handovers flexibly based on network capabilities and energy-saving strategies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the terminal device immediately executes HO command upon receiving it, then the handover speed is improved, but the handover reliability deteriorates due to frequent handover failures in high-speed mobility scenarios
Solution Approach 1:
The patent applies preliminary action by configuring handover conditions and parameters in advance before the actual handover execution. The network pre-configures the terminal device with HO configuration information including execution conditions, target cell information, and resource allocations. This allows the terminal to evaluate whether to execute handover based on pre-assessed conditions, reducing the risk of failed handovers while maintaining quick execution when conditions are met.
2Ease of operation
If the network sends paging to terminal devices in idle or inactive state, then the network can notify terminal devices to receive paging messages, but the terminal device power consumption increases
Solution Approach 1:
The patent applies periodic action by implementing discontinuous reception (DRX) mechanisms where terminal devices in idle or inactive states periodically wake up to check for paging messages rather than continuously monitoring. The network sends paging messages at predetermined intervals, and terminal devices only activate their receivers during specific paging occasions, significantly reducing power consumption while maintaining the ability to receive notifications.
3Use of energy by stationary object
If the network implements energy-saving strategies by putting base stations in low-power states, then the network energy consumption is reduced, but the handover reliability deteriorates due to frequent handover failures
Solution Approach 1:
The patent applies preliminary action by pre-configuring handover parameters and conditions before base stations transition to low-power states. The network proactively prepares handover configurations, identifies suitable target cells, and pre-allocates resources before the source base station enters energy-saving mode. This ensures that when handover is triggered, the terminal device has all necessary information to complete the handover successfully, even though the source base station will be in a low-power state during execution.
Solution Approach 2:
The patent introduces an intermediary mechanism where a controlling base station or network entity maintains active state and coordinates handovers involving base stations in low-power states. The intermediary base station receives handover requests, prepares target cell configurations, and manages the handover process, ensuring reliable execution even when the source or target base stations are in energy-saving modes. This intermediary acts as a mediator that bridges the gap between energy-saving operations and handover reliability.
Data Source
AI summary
A method for wireless communication includes: a terminal device receives handover (HO) configuration information. The HO configuration information includes a condition that the terminal device is required to meet to perform cell HO, and the condition is related to one or more of network status, and network energy saving (NES) information.