Cellular Modem Power Management for IMS Handover
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Solution Overview
Problem
Wireless devices experience reduced battery life due to unnecessary power consumption when using multiple wireless networks for IMS services, particularly when a cellular modem remains active while using a WLAN for communication, leading to inefficient power management and potential impacts on user experience during handovers.
Innovation Solution
Implementing a controller that determines when a device is using a WLAN instead of a cellular network and switches the cellular modem to power-save mode, detects handover triggering events, and performs registration and handover to the cellular network to conserve power and ensure seamless service transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cellular modem remains in active mode while using WLAN for communication, then service availability is maintained, but power consumption increases and battery life is reduced
Solution Approach 1:
The modem dynamically transitions between active mode and power-save mode based on network conditions and service requirements. The controller monitors WLAN signal quality and service status, switching the modem state accordingly - maintaining active state when service handover is needed, and transitioning to power-save state when WLAN can handle communication independently.
2Use of energy by moving object
If the cellular modem is switched to power-save mode to reduce power consumption, then battery life is extended, but service responsiveness may be impacted during handover events
Solution Approach 1:
The controller performs preliminary actions by monitoring WLAN signal quality and predicting potential handover scenarios before they occur. When signal degradation is detected, the controller proactively prepares the modem for potential activation, ensuring rapid response when handover is actually needed, thus maintaining service responsiveness while minimizing the time spent in power-save mode.
3Reliability
If the device uses multiple wireless networks for IMS services, then service coverage and reliability are improved, but unnecessary power consumption occurs reducing battery life
Solution Approach 1:
The system applies different operational characteristics to different network interfaces based on local conditions. The controller evaluates WLAN signal quality, service type, and handover requirements to determine the optimal active state for the cellular modem. When WLAN provides sufficient service quality, the cellular modem operates in power-save mode; when service requirements or signal conditions demand, it switches to active mode, creating localized optimal performance for each network interface.
Data Source
AI summary
A device may include a controller and a modem of a first wireless network. The controller may determine that the modem is in active mode and the device is using a second wireless network for communication instead of the first wireless network. In response to the determining, the controller may switch the modem into power-save mode. In response to a handover triggering event, the controller may switch the modem to the active mode and acquire a service of the first wireless network without registering with the first wireless network. The controller may determine that a communication service is to be handed over to the service of the first wireless network. In response to determining that the communication service is to be handed over, the controller may perform registration with the first wireless network, and perform handover of the communication service to the service of the first wireless network.