Cellular Proxy for WLAN Network Detection in Dual-Mode Handsets
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Solution Overview
Problem
Dual-mode handsets face high power consumption issues due to frequent mode-switching in WLAN networks, especially when packet delivery is small or unsynchronized, leading to inefficient power usage and delayed response times, as existing power management schemes are not effective in reducing energy demands.
Innovation Solution
The cellular interface acts as a proxy for the WLAN interface, activating it only when needed for calls or applications, allowing the WLAN interface to search for nearby networks and return to sleep mode after use, thereby reducing power consumption and extending standby time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the WLAN interface is activated frequently to discover networks or deliver packets, then network responsiveness and connectivity are improved, but power consumption increases significantly
Solution Approach 1:
The cellular interface is activated in advance to receive indication messages before WLAN activation is needed. The system uses the cellular interface to detect WLAN availability and prepare for seamless switching, eliminating the need for frequent WLAN wake-ups while maintaining network responsiveness
Solution Approach 2:
The cellular interface acts as an intermediary between the user equipment and WLAN networks. It receives indication messages about WLAN availability and coordinates WLAN activation only when necessary, reducing direct WLAN interface activations while maintaining connectivity
2Use of energy by moving object
If the WLAN interface remains in sleep mode to conserve power, then power consumption is reduced, but network discovery and response time are delayed
Solution Approach 1:
The system performs preliminary detection of WLAN availability through the cellular interface before WLAN activation is needed. Indication messages are received in advance, allowing the WLAN interface to remain in sleep mode while still being prepared for quick activation when networks are available
Solution Approach 2:
The system implements feedback through indication messages that provide real-time information about WLAN availability. This feedback mechanism allows the device to make informed decisions about WLAN activation, balancing power consumption with network discovery needs
3Productivity
If mode-switching frequency is increased to improve packet delivery synchronization, then packet delivery efficiency is improved, but power consumption due to switching operations increases
Solution Approach 1:
The cellular interface serves as a mediator that coordinates mode-switching operations. It receives indication messages and triggers WLAN activation only when packet delivery is actually needed, reducing unnecessary switching operations while maintaining packet delivery efficiency
Solution Approach 2:
The system uses periodic indication messages from the cellular interface to determine when WLAN activation is necessary. This periodic feedback mechanism optimizes switching frequency to match actual packet delivery needs rather than using fixed high-frequency switching
Data Source
AI summary
A method and a system discover a wireless LAN network for a multi-mode handset in a power-efficient way. The method extends stand-by time for the cellular and wireless LAN multi-mode handset, taking advantage of that fact that the cellular interface demands less energy from the battery than the wireless LAN (WLAN)-based interface in such a handset. The method therefore uses the cellular interface as an always-on proxy for the wireless LAN interface to receive the initial packets of a communication session, and uses the initial packet or packets to activate the handset's interface with the wireless LAN.