UE Handover Sleep Mode Power Reduction
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Solution Overview
Problem
Conventional handover operation schemes in mobile communication systems prioritize handover success rate over power consumption, leading to increased power usage in User Equipment (UE) during handovers.
Innovation Solution
A method and apparatus that determine whether to enter a sleep mode based on Uplink transmission power, allowing the UE to send a measurement report message to a pivot Base Station and receive a handover command message during a listening window in sleep mode, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE maintains an awake state during handover to improve handover success rate, then handover reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic sleep mode operation where the UE can switch between sleep and awake states based on handover conditions. The UE determines whether to enter sleep mode by evaluating UL transmission power thresholds and handover parameters, allowing it to maintain sleep mode during handover when conditions permit, thereby reducing power consumption while maintaining adequate handover success rates.
Solution Approach 2:
The patent changes the operational state parameter of the UE from a fixed awake state to a dynamic state that can be sleep or awake based on evaluated conditions. By comparing UL transmission power against thresholds and assessing handover parameters, the system determines the appropriate state, transforming the UE operation from static to parameter-driven dynamic behavior.
2Use of energy by moving object
If the UE enters sleep mode to reduce power consumption, then power efficiency is improved, but handover success rate may deteriorate
Solution Approach 1:
The patent applies preliminary action by having the UE evaluate handover parameters and UL transmission power before entering sleep mode. The UE determines whether conditions are favorable for sleep mode during handover in advance, sending measurement reports to the network with sleep mode indicators. This preliminary evaluation ensures that sleep mode is only entered when handover success is not compromised.
Solution Approach 2:
The patent implements feedback mechanisms where the UE sends measurement reports to the network including sleep mode identification information. The network uses this feedback to make informed decisions about handover commands and can adjust parameters to ensure successful handover even when the UE is in sleep mode, thereby maintaining reliability while enabling power savings.
Data Source
AI summary
Provided are two types of schemes capable of reducing power consumption of a User Equipment (UE). The first scheme is to select a set capable of minimizing power consumption of the UE when the UE enters a sleep mode. The second scheme is a handover scheme in which the UE having entered the sleep mode maintains the sleep mode corresponding to a cooperative Base Station (BS) set in a handover of the UE.