Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2006-01-31
2006-01-31
Craver, Charles (Department: 2682)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S414200, C455S067130, C455S561000
Reexamination Certificate
active
06993335
ABSTRACT:
An apparatus and method for performing Mobile/IP handoff between different access technologies. Associated with each access technology are two thresholds, a Low Water Mark and a High Water Mark. The method uses these water marks to its access technology selection in a particular environment. Using the method, a mobile node102remains on its preferred network when the signal strength on the preferred network (interface) is above the low water mark. When the signal strength on the preferred network drops below the high water mark, the method calculates the low water mark for the network. When the signal strength on the preferred network drops below the low water mark (LWM), the method initiates handoff to the next available network that meets certain conditions. The method initiates handoff back to the preferred network when the signal strength measurement on the preferred network is again above the high water mark.
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Arumugam Karthikeyan
Natarajan Kadathur S.
Reddy Muddasani S.
Singh Ajoy K.
Valdivia Mary M.
Craver Charles
Motorola Inc.
Pace Lalita W.
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