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how does hand off take place in wireless LAN.I mean hand off form wireless LAN to gprs and from gprs to wireless lan.

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As I know, in this scenario no hand off on network layer. Hand of handled by application. Old connections close/die and new connection must be established by application.

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  • Sorry but hand off does occur when mobile station moves form wlan to gprs or form gprs to wlan – aakansha Nov 20 '14 at 15:50
  • It depend on how we define "hand off". To make hand of on network level (IP) device must keep IP address. It possible in tunnel, but not in base network. – mmv-ru Nov 20 '14 at 17:01
  • how does it occur in tunneling? – aakansha Nov 20 '14 at 18:30
  • Build IP tunnel from client to server side. (for ex. OpenVPN) When clent switch from one ISP (wlan) to other (mobile), client IP recieved from ISP changed, tunnel reestablished and IP inside tunnel keept unchanged. Openvpn has special option to keep tunnel interface UP when reconnecting. So from application point of view it just loss of packets. – mmv-ru Nov 20 '14 at 18:35

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