Invention Application
WO2007028028A1 HARD HANDOFF FROM A WIRELESS LOCAL AREA NETWORK TO A CELLULAR TELEPHONE NETWORK 审中-公开
从无线本地区网络到蜂窝电话网络的硬切换

HARD HANDOFF FROM A WIRELESS LOCAL AREA NETWORK TO A CELLULAR TELEPHONE NETWORK
Abstract:
A system and a method are provided for supporting a hard handoff procedure for a call from a wireless local area network (WLAN) to a cellular telephone network. The method includes: establishing a link between a user terminal (UT) and a serving WLAN, and a call via the WLAN link; simultaneously monitoring a serving cellular telephone network; forwarding information identifying the UT within the cellular network, to the serving WLAN; in response to losing the link with the serving WLAN, performing a hard handoff to the cellular network; and, continuing the call via the cellular network. Generally, the hard handoff can be performed if the WLAN is able to communicate the UT's identity to the cellular telephone, as the UT's position can be determined by the cellular network. The hard handoff is performed with the UT receiving resource allocations in a common control channeLmessage, such as a Short Message Ser vice (SMS) or paging message.
Patent Agency Ranking
0/0