Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2005-09-20
2005-09-20
Tran, CongVan (Department: 2683)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
Reexamination Certificate
active
06947737
ABSTRACT:
A system and method for enabling a first device (502, 504, 506) that may optionally roam between at least first and second wireless networks (500, 1102) to communicate with a second device (502, 504, 506) that may optionally roam between the at least first and second wireless networks (500, 1102). The devices (502, 504, 506) are preferably registered to each network in which the device may roam. A routing switch (1112) first transmits a data message to the receiving device at the last known location of the receiving device. If a negative acknowledgement is received, the message is routed to all other networks to which the receiving device is registered, either serially or in parallel, depending upon the configuration of the transmitting network. Routing devices (1112) and/or gateways (1110) are preferably provided for each network (500, 1102) to provide any required protocol and/or message format conversions.
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Franklin Julian M.
Leboulanger Patrick J.
Massie Rodney E.
Speaks Chantel M.
Donner Irah H.
Motient Communications Inc.
Tran CongVan
Wilmer Cutler Pickering Hale and Dorr LLP
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