System and apparatus for performing broadcast and localcast communications
First Claim
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1. A localcast transmitter, comprising:
- a first interface;
a first encoder coupled to said first interface through a second encoder;
a packet assembler coupled to said first encoder and to the first interface through the second encoder such that the packet assembler receives input from the first encoder when transmitting at a first transmission speed and the packet assembler receives input from the first interface through the second encoder when transmitting at a second transmission speed, such that first encoder is bypassed when transmitting at the second transmission speed;
wherein the packet assembler interleaves a first portion of the input received and a second portion of the input received over a broadcast frame that includes sub frames;
wherein the first portion is for transmission at a first latency and the second portion is for transmission at a second latency, the second latency being lower than the first latency; and
wherein each sub frame includes data associated with the first portion and data associated with the second portion that are interleaved together;
a control function coupled to said first interface, said encoder and said packet assembler;
a modulator, coupled to the packet assembler, that comprises a localcast mode; and
an antenna coupled to the modulator.
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Abstract
Described is a communication system including mobile communication devices. In the described system, the mobile devices may be wrist-worn watches such as are in common use today, except that the watches are specially configured to receive data in a “broadcast” mode and transmit and/or receive data in a “localcast” mode. The localcast mode includes the ability to transmit and receive data in a peer-to-peer fashion, allowing mobile devices to communicate directly with each other. The ability to combine two of these communication modes in a small, integrated and hence inexpensive and low-power package provides many advantages over existing personal communication device solutions.
303 Citations
20 Claims
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1. A localcast transmitter, comprising:
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a first interface; a first encoder coupled to said first interface through a second encoder; a packet assembler coupled to said first encoder and to the first interface through the second encoder such that the packet assembler receives input from the first encoder when transmitting at a first transmission speed and the packet assembler receives input from the first interface through the second encoder when transmitting at a second transmission speed, such that first encoder is bypassed when transmitting at the second transmission speed;
wherein the packet assembler interleaves a first portion of the input received and a second portion of the input received over a broadcast frame that includes sub frames;
wherein the first portion is for transmission at a first latency and the second portion is for transmission at a second latency, the second latency being lower than the first latency; and
wherein each sub frame includes data associated with the first portion and data associated with the second portion that are interleaved together;a control function coupled to said first interface, said encoder and said packet assembler; a modulator, coupled to the packet assembler, that comprises a localcast mode; and an antenna coupled to the modulator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A localcast transmitter included in a mobile device, wherein the mobile device includes a localcast mode and a broadcast mode, comprising:
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means for interfacing with a data source; means for encoding system information provided by the data source; means for encoding data provided by the means for encoding system information for transmission; means for assembling packets from data provided by the means for encoding system information when transmitting at a first transmission speed and from data provided by the means for encoding data when transmitting at a second transmission speed, such that the means for encoding data is bypassed when transmitting at a second transmission speed;
wherein the means for assembling packets interleaves a first portion of input data and a second portion of the input data over a broadcast frame that includes sub frames;
wherein the first portion is for transmission at a first latency and the second portion is for transmission at a second latency, the second latency being lower than the first latency; and
wherein each sub frame includes data associated with the first portion and data associated with the second portion that are interleaved together; anda means for transmitting the assembled packets over a locally-unused FM frequency when the mobile device is in the localcast mode. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A localcast transmitter included in a mobile device, wherein the mobile device includes a localcast mode and a broadcast mode, comprising:
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an interface that is coupled to a data source, wherein the interface is arranged for receiving data from the data source when the mobile device is in a localcast mode; a first encoder that is coupled to the interface through a second encoder, wherein the first encoder is arranged to encode the received data to produce encoded data; an assembler that is coupled to the first encoder and to the interface through the second encoder such that the assembler receives input from the first encoder when transmitting at a first transmission speed and the assembler receives input from the interface through the second encoder when transmitting at a second transmission speed, wherein the assembler is arranged to interleave the received input into data segments, add correlation information to the data segments, and convert the data segments into a bit stream;
wherein interleave the received input into data segments includes interleaving a first portion of the input received and a second portion of the input received over a broadcast frame that includes sub frames;
wherein the first portion is for transmission at a first latency and the second portion is for transmission at a second latency, the second latency being lower than the first latency; and
wherein each sub frame includes data associated with the first portion and data associated with the second portion that are interleaved together;a control function that is coupled to the interface, the first encoder, the second encoder, and the assembler, wherein the control function is arranged to control handshaking functions; and a modulator that is coupled to the assembler, wherein the modulator is arranged to generate an FM frequency output in response to the bit stream produced by the assembler, and provide an FM frequency output to an antenna. - View Dependent Claims (18, 19, 20)
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Specification