H - Electricity – 04 – W
Patent
H - Electricity
04
W
H04W 36/08 (2009.01) H04L 12/28 (2006.01) H04L 12/66 (2006.01) H04M 11/06 (2006.01) H04Q 3/64 (2006.01)
Patent
CA 2616238
A computer network which includes a wireless local area network (WLAN) has at least first and second subnet segments and a router coupled between the first and the second subnet segments. The first subnet segment has a first IP subnet address range and the second subnet segment has a second IP subnet address range different from the first IP subnet address range. At least a first wireless access point of the WLAN in the first subnet segment has both a local extended service set identifier (ESSID) and a global ESSID for mobile communication devices to associate with it. Similarly, at least a second wireless access point of the WLAN in the second subnet segment has both a local ESSID and the global ESSID for mobile communication devices to associate with it. The global ESSID is used for accessing a global virtual local area network (VLAN) which spans the entire network including the first and the second subnet segments. Initially, a mobile communication device associates with the first wireless access point using the local ESSID. Just prior to the establishment of a Voice over IP (VoIP) session, however, the mobile device reassociates with the first wireless access point using the global ESSID of the global VLAN. Thus, the VoIP session is established and maintained for the mobile device in the global VLAN. If a handoff to the second wireless access point in the second subnet segment is made during the VoIP session, the mobile device associates with the second wireless access point using the global ESSID of the global VLAN. After termination of the VoIP session, the mobile device associates with a wireless access point of the WLAN using the local ESSID. Advantageously, no IP address reassignment for inter-subnet handoffs are needed during VoIP sessions, which improves the timeliness and reliability of such handoffs.
Borden Ladner Gervais Llp
Research In Motion Limited
LandOfFree
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