Patent ID: 7912025
Filing Date: 2011-03-22
Classification: H04L,H04W

Abstract:
1. A method in a radio modem device for use in processing data packets communicated from a host device using a predetermined type of protocol, the radio modem device being configured to communicate with a cellular telecommunications network over a wireless link and communicate with the host device over a wired serial link, the method comprising the steps of: maintaining a Point-to-Point Protocol (PPP) connection between the host device and the radio modem device over a wired serial link; maintaining a wireless link for communications with the cellular telecommunications network; monitoring radio signal strength indicator (RSSI) information during the communications with the cellular telecommunication network; establishing a packet data service attachment with the cellular telecommunications network over the wireless link; maintaining an attachment state of the packet data service attachment during the operation; receiving data packets from the host device; removing a PPP wrapper of data packets to reveal a destination IP address and a destination port number; identifying whether the destination IP address and the destination port number match an IP address and port number of a radio modem server of the radio modem device; identifying whether a cookie which identifies the predetermined type of protocol is contained in a cookie field of the data packets; in response to identifying a mismatch between the IP addresses or the port numbers, or that the cookie is not contained in the cookie field: causing the data packets to be routed to a server, over the wireless link, using the packet data service attachment with the cellular telecommunications network; in response to identifying a match between the IP addresses and the port numbers when the cookie is contained in the cookie field: