Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
1998-07-17
2001-02-20
Patel, Ajit (Department: 2738)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
Reexamination Certificate
active
06192041
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to the transmission of PPP data packets from networking application software running on a host computer to a network such as the internet and more particularly relates to the transmission of such data packets over a CDMA (Code Division Multiple Access) type cellular telephone.
BACKGROUND
It is considered commonplace for a user to connect his/her computer with the internet. A computer user may employ any of various popular serial networking application software packages to make such a connection, and to send out PPP (Point-to-Point Protocol) data packets to an attached device such as a modem. (The modem may also be integral to the computer). Many such popular serial networking applications will not transmit their PPP data packets until they have received a signal (called the “CONNECT” signal) indicating that the attached device has dialed a requested telephone number and completed the customary “handshake” protocol with the corresponding remote modem (i.e. the remote modem of an internet service provider). Other networking applications will transmit the PPP data packets if the user sets the command AT+CRM=1. Once the AT+CRM command is set, it is set for all networking applications hosted on that computer, and if a user wants to switch from an asynchronous mode of communication (where AT+CRM must be set to=0) to a packet data mode (where AT+CRM must be set=1) the user must reset the AT+CRM command each time he/she switches modes.
A CDMA type cellular phone does not dial a telephone number and does not perform the usual “handshake” protocol in order to set up a PPP data packet call. Therefore, the networking application software will not receive a “CONNECT” signal and will not begin transmission of the PPP data packets, unless some additional action is taken such as setting the AT+CRM command=1. There is thus a need for a simple and convenient procedure to induce a networking application, which normally requires a “CONNECT” signal, to transmit its PPP data packets when its connection to the internet is to be made via a CDMA type device such as a CDMA type cellular telephone. Such procedure should not require the user to reset the AT+CRM command each time a mode change is desired.
SUMMARY OF THE INVENTION
In order to induce the networking application software to transmit its PPP data packets, the data capable CDMA subscriber device (e.g. cell phone) monitors the telephone dial string command sent by the networking application and compares it against a (list of) reserved phone number(s). When the subscriber device detects/receives a typical “AT” dial string command the subscriber device examines the phone number contained within the dial string, and compares it against the reserved phone number(s).
If the phone number contained within the dial string is not one of the reserved numbers, the CDMA device will construct the usual asynchronous data call and transmit the call over the system. In response, the IWF (inter working function) will issue the expected “CONNECT” signal back to the networking application. Having received the expected “CONNECT” signal, the networking application will then transmit asynchronously in the normal manner.
If the phone number contained within the dial string matches a number on the reserved list, the CDMA subscriber device does not construct a CDMA call in the asynchronous format (i.e., asynchronous service options 0×0004, 0×0005, 0×1004, 0×1005, 0×12 or 0×13). Instead, it constructs a data packet call (i.e., packet service options 0×0007, 0×00015 or 0×1007) and simply transmits a return “CONNECT” signal to the networking application. This tricks the networking application into believing that the CDMA device has nearly instantaneously connected with a remote modem. The networking application then transmits its PPP packets as desired, via the CDMA subscriber device.
Other features and advantages of the invention will become readily apparent from the following detailed description of the invention and its various embodiments, from the claims and from the accompanying drawings in which the details of the invention are fully and completely disclosed as part of this specification.
REFERENCES:
patent: 5949775 (1999-09-01), Rautiola et al.
patent: 5978386 (1999-11-01), Hamalainen et al.
patent: 6009088 (1999-12-01), Taguchi et al.
patent: 6081536 (2000-06-01), Gorsuch et al.
patent: 6097733 (2000-08-01), Basu et al.
Brown Charles D.
Patel Ajit
Qualcomm Incorporated
Wadsworth Philip
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