Mobile Device Power Saving via Screen-Linked Connection State Switching
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Solution Overview
Problem
Mobile devices in wireless communication systems face high power consumption due to the WCDMA protocol's Cell_PCH and Cell_FACH states, which have shorter DRX cycles and higher standby current, leading to reduced battery life and the need for frequent recharging.
Innovation Solution
A power saving method that detects the screen status of a mobile device and switches it to different connection states, such as Cell_PCH or Idle, based on screen activity, using appropriate fast dormancy mechanisms to minimize power consumption by transitioning to lower power states when the screen is off and maintaining faster link setup times when it's on.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the mobile device uses Cell_PCH or Cell_FACH states for faster link setup, then the link recovery speed is improved, but the power consumption increases due to shorter DRX cycles and higher standby current
Solution Approach 1:
The patent dynamically selects between Cell_PCH and idle states based on screen status. When the screen is on, the device uses Cell_PCH state for fast link recovery. When the screen is off, the device transitions to idle state for lower power consumption. This dynamic state selection resolves the contradiction by adapting the connection state to current usage conditions.
Solution Approach 2:
The patent changes the DRX cycle parameter based on screen status. In Cell_PCH state with screen on, a shorter DRX cycle is used for fast recovery. In idle state with screen off, a longer DRX cycle is used to reduce power consumption. This parameter adjustment resolves the contradiction between speed and energy consumption.
2Speed
If the mobile device stays in connected state for faster data transmission, then the transmission speed is improved, but the battery life is reduced due to continuous power consumption
Solution Approach 1:
The patent implements periodic transitions between connected and idle states based on screen activity. When the screen is on, the device maintains connected state for fast transmission. When the screen is off, the device periodically transitions to idle state to conserve battery. This periodic state management resolves the contradiction between transmission speed and battery life.
Solution Approach 2:
The patent dynamically adjusts the connection state based on real-time screen status detection. The system transitions from static connected state to dynamic state selection, choosing connected state when screen is on and idle state when screen is off, thereby resolving the speed-battery life contradiction.
3Loss of time
If the mobile device uses shorter DRX cycle in Cell_PCH state for faster link setup, then the link establishment time is reduced, but the average standby current increases
Solution Approach 1:
The patent changes the DRX cycle parameter based on screen status. When screen is on, shorter DRX cycle is used in Cell_PCH state for fast link establishment. When screen is off, the device transitions to idle state with longer DRX cycle to reduce standby current. This parameter adaptation resolves the contradiction between time loss and energy loss.
Solution Approach 2:
The patent implements dynamic DRX cycle adjustment based on screen activity. The system transitions from fixed short DRX cycle to adaptive DRX cycle selection, using short cycles when screen is on and long cycles when screen is off, thereby resolving the contradiction between link establishment time and standby current.
Data Source
AI summary
A power saving method for a mobile device in a wireless communication system is disclosed. The power saving method comprises detecting a screen status of the mobile device and switching to different connection states according to the screen status of the mobile device when the mobile device has no data transmission and reception.