Method and system for wireless LAN network detection

摘要

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.

主权项

1. A method for a power-efficient communication device having a wireless local area network (WLAN) interface for connecting to a WLAN and a cellular interface for connecting to a cellular network, the WLAN interface and the cellular interface each being capable of communicating using the Session Initiation Protocol (SIP), the method comprising:
receiving a first status update from the communication device at a first SIP server serving the WLAN interface, the first status update indicating that the WLAN interface is deactivated; relaying a first SIP INVITE message received at the first SIP server to a second SIP server serving the cellular interface in response to the indication that the communication device is deactivated; receiving a second status update from the communication device at the first SIP server, the second status update indicating that the WLAN interface is activated; and forwarding a second SIP INVITE message received at the first SIP server directly through the WLAN to the WLAN interface in response to the indication that the WLAN interface is activated.