Packet data communication system with buffered data and control channels
First Claim
1. A packet data communication system having a control station and a plurality of remote terminals that communicate on demand with said control station over a wireless link,said control station comprising:
- a data port for receiving data packets destined for said terminals;
means for generating a plurality of data channels for carrying said data packets;
means for assigning said data packets destined for a particular terminal to one or more of said data channels;
means for generating a control channel carrying control information required to permit data to be extracted from said data channels; and
means for transmitting said data channels and said control channel simultaneously to said remote terminals as an aggregate signal; and
each of said terminals comprising a receiver for receiving said aggregate signal;
an analog-to-digital converter for digitizing said aggregate signal;
a buffer for storing said aggregate signal containing said data channels and said control channel;
a processor for continually processing said stored aggregate signal to read said control channel stored in said buffer and extract said control information therefrom without reading said one or more data channels; and
said processor further processing said stored aggregate signal to extract said packet data destined for said terminal from one or more of said data channels in response to control information received on said control channel identifying said terminal as a destination for said packet data.
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Accused Products
Abstract
A packet data communication system includes a control station and a plurality of mobile terminals that communicate on demand with the control station over a wireless link. The control station has a data port for receiving data packets destined for the terminals, an arrangement for generating a plurality of data channels for carrying the data packets, and an arrangement for assigning the data packets destined for a particular terminal to one or more of the data channels. A control channel carries control information pertaining to the data channels. The channels are transmitted to the mobile terminals as an r.f. signal. The terminals have a receiver for receiving the r.f. signal, an analog-to-digital converter for digitizing the received signal, and a buffer for storing the digitized received signal. The terminals continually monitor the control channel to extract control information. The stored signal is processed to extract packet data destined for the terminal from one or more of the data channels in response to control information received on the control channel.
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Citations
16 Claims
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1. A packet data communication system having a control station and a plurality of remote terminals that communicate on demand with said control station over a wireless link,
said control station comprising: -
a data port for receiving data packets destined for said terminals;
means for generating a plurality of data channels for carrying said data packets;
means for assigning said data packets destined for a particular terminal to one or more of said data channels;
means for generating a control channel carrying control information required to permit data to be extracted from said data channels; and
means for transmitting said data channels and said control channel simultaneously to said remote terminals as an aggregate signal; and
each of said terminals comprising a receiver for receiving said aggregate signal;
an analog-to-digital converter for digitizing said aggregate signal;
a buffer for storing said aggregate signal containing said data channels and said control channel;
a processor for continually processing said stored aggregate signal to read said control channel stored in said buffer and extract said control information therefrom without reading said one or more data channels; and
said processor further processing said stored aggregate signal to extract said packet data destined for said terminal from one or more of said data channels in response to control information received on said control channel identifying said terminal as a destination for said packet data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 15)
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10. A method of establishing communication between a control station and one or more of a plurality of mobile terminals over a wireless link, comprising the steps of:
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generating a plurality of data channels and a control channel;
dynamically assigning one or more data channels to a destination terminal;
modulating said one or snore data channels with packet data;
modulating said control channel with information pertaining to said data channels and required to extract said packet data therefrom;
transmitting said data channels and said control channel simultaneously as an aggregate signal to said mobile terminals;
buffering said aggregate signal in digitized form at said destination terminal;
continually processing said aggregate signal stored in said buffer to extract said control information therefrom without reading one or more said data channels; and
in response to control information received on said control channel and stored in said buffer as part of said aggregate signal, extracting said packet data from said aggregate signal stored in said buffer when said control information determines that said packet data is destined for said destination terminal. - View Dependent Claims (11, 12, 13, 14, 16)
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Specification