Method and apparatus for maintaining communications when radio communication is unavailable
First Claim
1. A method for maintaining communications between a mobile computer and a mobile subscriber unit comprising the steps ofdetermining at the mobile subscriber unit whether a connection is available between the mobile subscriber unit and a radio communications system and if a connection is available, retrieving a first IP address for the mobile computer from the radio communications system;
- caching the first IP address in the mobile subscriber unit for use by the mobile computer; and
utilizing the first IP address even if the radio communications system is unavailable and then updating at the mobile subscriber unit the first IP address with a second IP address obtained from the radio communications system when the radio communications system is available.
2 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus for maintaining communications between a mobile computer and a mobile subscriber unit is disclosed. The method and apparatus comprise determining whether a connection is available between the mobile subscriber unit and a radio communications system. If a connection is available, then the method and apparatus include retrieving a first IP address for the mobile computer from the radio communications system. Then, the method and apparatus comprise caching the first IP address in the mobile subscriber unit for use by the mobile computer. Finally, the method and apparatus include utilizing the first IP address even if the radio communications system is unavailable and updating the first IP address with a second IP address obtained from the radio communications system when the radio communications system is available.
4 Citations
15 Claims
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1. A method for maintaining communications between a mobile computer and a mobile subscriber unit comprising the steps of
determining at the mobile subscriber unit whether a connection is available between the mobile subscriber unit and a radio communications system and if a connection is available, retrieving a first IP address for the mobile computer from the radio communications system; -
caching the first IP address in the mobile subscriber unit for use by the mobile computer; and utilizing the first IP address even if the radio communications system is unavailable and then updating at the mobile subscriber unit the first IP address with a second IP address obtained from the radio communications system when the radio communications system is available. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An adaptive routing system for maintaining communications between a mobile computer and a mobile subscriber unit comprising:
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the mobile computer connected by a wired interface to the mobile subscriber unit wherein the mobile subscriber unit contains cache memory for storing an IP address for the mobile computer retrieved from a radio communications network and the mobile subscriber unit is connected to the radio communications system by a wireless link, wherein communications are maintained between the mobile subscriber unit and the mobile computer when the wireless link is unavailable by utilizing the stored IP address. - View Dependent Claims (11, 12, 13)
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14. A system for maintaining communications between a mobile computer and a mobile subscriber unit comprising the steps of:
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means for determining at the mobile subscriber unit whether a connection is available between the mobile subscriber unit and a radio communications system and if a connection is available, means for retrieving a first IP address for the mobile computer from the radio communications system; means for caching the first IP address in the mobile subscriber unit for use by the mobile computer; and means for utilizing the first IP address even if the radio communications system is unavailable and then updating at the mobile subscriber unit the first IP address with a second IP address obtained from the radio communications system when the radio communications system is available. - View Dependent Claims (15)
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Specification