Handoff of (i) a mobile wirelessly communicating devicea mobilebetween
(ii) a plurality of stationary base stations within cells within a domain of (iii)
a stationary gateway router all within (iv) a communications network based on the
Internet Protocol (IP) is without interchange of control, and responsive to the
mobile, only. The gateway router assigns to the mobile at a time before the handoff
IP addresses suitable for the mobile to connect to the gateway router through all
the plurality of base stations of the domain. Unilaterally deriving a handoff decision
to switch base stations, the mobile directs its wireless communications link to
a new base station where signal level registration is performed. Responsive to
a link layer trigger at the new base station, the gateway router is informed of
the handoff, and both the router and the mobile independently construct the mobile's
new IP address. Handoff latency is typically 40 ms.
