Method and apparatus for the dynamic allocation of signal bandwidth between audio, video and data signals

• US 6,111,863 A
• Filed: 12/29/1995
• Issued: 08/29/2000
• Est. Priority Date: 12/29/1995
• Status: Expired due to Term

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: LSI Logic Corporation (Broadcom, Inc.)
• Inventors: Rostoker, Michael D., Jaggi, Sandeep, Daane, John
• Primary Examiner(s): NGUYEN, CHAU T
• Application Number:
  US08/580,577
• Time in Patent Office: 1,705 Days
• Field of Search: 370/455, 370/444, 370/431, 370/310, 370/329, 370/330, 370/443, 370/313, 370/322, 370/343, 370/348, 370/433, 370/435, 370/437, 370/230, 370/235, 370/412, 370/465, 370/468 , 370/477, 370/473, 370/349, 370/522, 370/335, 370/337, 348/14, 348/17, 348/19, 348/387, 348/388, 455/512, 455/527, 455/557
• US Class Current: 370/329
• CPC Class Codes: H04N 21/6131 involving transmission via a mobile phone network wireless downlink channel access H04W74/006
• CPC Class Codes: H04W 28/14 using intermediate storage
• CPC Class Codes: H04W 72/56 based on priority criteria
• CPC Class Codes: H04W 72/566 of the information or information source or recipient

Abstract

A wireless communication unit for a wireless communication system transmits and receives video, audio and data signals within an RF bandwidth. The RF bandwidth is allocated among the video, audio and data signals to allow the video, audio and data signals to fit within the RF bandwidth. The allocation is performed by buffering the signals, making priority assignments to each of the buffered signals, and transmitting the buffered signals according to the priority assignments. The transmitted signals occupy the RF bandwidth in portions specified by the priority assignments. The priority assignments can be changed during a communication link. The subscriber unit receives a transmission header from another party on the communication link, which may include a request by the other party to change the priority assignments. If such a request is received, the subscriber unit automatically changes the priority assignments in response to the request. The communication unit is applicable to subscriber units and base stations. One such subscriber can be a cellular telephone having full-motion video capability.

Claims

1. A wireless system for the communication of video, audio and data signals over an RF bandwidth, comprising:

a plurality of subscriber units operable to allocate the RF bandwidth among the video, audio and data signals by making priority assignments of transmission to the video, audio and data signals;

a plurality of base stations covering a geographical area divided into a plurality of cell sites, each base station being operable to establish RF communications links with the subscriber units in its cell site; and

a network controller connected to the plurality of base stations;

wherein each subscriber unit receives a plurality of transmission headers during a communication link, each transmission header including a number of bits indicating whether a request to change the priority assignments between the video, audio and data signals has been made.

2. The system of claim 1, wherein the number of bits indicate whether a priority assignment of one of the signals should be increased, decreased or unchanged.

3. The system of claim 1, wherein the transmission header includes four bits for indicating whether a priority assignment of one of the signals should be increased, decreased or unchanged.

4. The system of claim 1, wherein at least one subscriber unit comprises:

a digital transceiver operable to transmit and receive a data signal and compressed video and audio signals over the RF bandwidth; and

a controller operable to dynamically allocate the RF bandwidth among the video, audio and data signals prior to transmission, the dynamic allocation being made in response to the transmission header of a received signal.

5. The system of claim 1, wherein at least one base station comprises:

at least one digital transceiver operable to transmit and receive data signals and compressed video and audio signals over the RF bandwidth; and

a controller operable to dynamically allocate the RF bandwidth among the video, audio and data signals prior to transmission, the dynamic allocation allowing the video, audio and data signals to be transmitted within the RF bandwidth.

6. A mobile video telephone, comprising:

a digital transceiver operable to transmit and receive a data signal and compressed video and audio signals over an RF bandwidth;

a controller operable to dynamically allocate the RF bandwidth among the video, audio and data signals, the dynamic allocation being performed by making priority assignments to each of the video, audio and data signals and transmitting the video, audio and data signals according to the priority assignments; and

a display for displaying a video signal received by the transceiver;

wherein the controller performs the steps of;

buffering the video, audio and data signals to be transmitted;

making the priority assignments to each of the buffered signals;

supplying the buffered signals to the transceiver such that the buffered signals, when transmitted, occupy the fixed bandwidth in portions specified by the priority assignments.

7. The video telephone of claim 6, wherein the transceiver includes:

an antenna;

a T/R module coupled to the antenna;

a receiver having an input coupled to the T/R module; and

a transmitter having an output coupled to the T/R module.

8. The video telephone of claim 7, wherein the receiver includes:

a demodulator for demodulating an incoming signal from the T/R module;

a demultiplexer for separating the demodulated signal into a transmission header and video, audio and data signals, the transmission header being supplied to the controller;

a first decompressor for decompressing the video signal according to a rate embedded in the video signal; and

a second decompressor for decompressing the audio signal according to a rate embedded in the audio signal.

9. The video telephone of claim 7, wherein the transmitter includes:

a first compressor for compressing the video signal to fit within a video bandwidth supplied by the controller;

a second compressor for compressing the audio signal to fit within an audio bandwidth supplied by the controller;

a combiner for combining the compressed video and audio signals;

a PSK modulator responsive to an output of the combiner; and

a carrier frequency modulator, responsive to an output of the PSK modulator.

10. The mobile video telephone of claim 6, wherein the controller performs the additional step of changing the rates of compression of select signals, whereby the transceiver increases the compression of the corresponding signals.

11. The mobile video telephone of claim 6, wherein the controller performs the additional steps of:

receiving signals including transmission headers from another party when a communication link with the other party has been established;

monitoring the transmission headers for requests to change the priority assignments; and

changing the priority assignments in response to the requests, whereby the bandwidth are allocated among the signals in accordance with the requests.

12. A wireless communication unit, comprising:

at least one digital transceiver operable to transmit and receive a plurality of signals comprising at least two from the group consisting of video signals, audio signals, and data signals;

a controller operable to dynamically allocated the fixed bandwidth among the plurality of signals, the dynamic allocation being performed by making priority assignments to each of the plurality of signals and transmitting the plurality of signals according to the priority assignments, wherein said controller supplies buffered signals to the transceiver such that the buffered signals, when transmitted, occupy the fixed bandwidth in portions specified by the priority assignments; and

a plurality of queues corresponding to the plurality of buffers, the controller buffering the plurality of signals in the queues;

wherein the controller performs the steps of;

buffering the signals to be transmitted;

making the priority assignments to each of the buffered signals;

receiving signals including transmission headers from another party when a communication link with the other party has been established;

monitoring the transmission headers for requests to change the priority assignments; and

changing the priority assignments in response to the requests, whereby the fixed bandwidth is allocated among the plurality of signals in accordance with the requests.

13. The communication unit of claim 12, wherein the priority assignments are changed incrementally until the requests have stopped.

14. The communication unit of claim 13, wherein each request occupies four bits in the transmission header.

15. A wireless communication unit, comprising:

at least one digital transceiver operable to transmit and receive a plurality of signals over a fixed bandwidth; and

a controller operable to dynamically allocate the fixed bandwidth among the plurality of signals, the dynamic allocation being performed by making priority assignments to each of the plurality of signals and transmitting the plurality of signals according to the priority assignments wherein the communication unit is a subscriber unit;

wherein the transceiver includes;

an antenna;

a T/R module coupled to the antenna;

a receiver having an input coupled to the T/R module; and

a transmitter having an output coupled to the T/R module; and

wherein the receiver further includes;

a demodulator for demodulating an incoming signal from the T/R module;

a demultiplexer for separating the demodulated signal into a transmission header and the plurality of signals, the transmission header being supplied to the controller; and

at least one decompressor for decompressing select signals of the plurality according to rates embedded in the select signals.

16. A wireless communication unit, comprising:

at least one digital transceiver operable to transmit and receive a plurality of signals over a fixed bandwidth; and

a controller operable to dynamically allocated the fixed bandwidth among the plurality of signals, the dynamic allocation being performed by making priority assignments to each of the plurality of signals and transmitting the plurality of signals according to the priority assignments wherein the communication unit is a subscriber unit;

wherein the transceiver includes;

an antenna;

a T/R module coupled to the antenna;

a receiver having an input coupled to the T/R module; and

a transmitter having an output coupled to the T/R module; and

wherein the transmitter further includes;

at least one compressor for compressing select signals of the plurality at compression rates supplied by the controller;

a combiner for combining the plurality of signals;

a PSK modulator responsive to an output of the combiner; and

a carrier frequency modulator, responsive to an output of the PSK modulator.

17. The communication unit of claim 16, wherein the transmitter further includes an encoder between the combiner and PSK modulator for generating a code division spread spectrum signal from an output of the combiner, the spread spectrum signal being supplied to the PSK modulator.

18. The communication unit of claim 16, wherein the transmitter further includes an encoder between the combiner and PSK modulator for generating a time division multiplexed signal from an output of the combiner, the time division multiplexed signal being supplied to the PSK modulator.

19. A method of communicating a plurality of signals within an RF bandwidth, comprising the steps of:

making priority assignments to each of the plurality of signals;

transmitting the plurality of signals within the RF bandwidth according to the priority assignments, wherein the transmitted signals occupy the RF bandwidth in portions specified by the priority assignments;

buffering the signals prior to the step of making the priority assignments, wherein the signals are buffered on a first-in, first-out basis;

establishing a communication link with another party;

receiving signals including transmission headers from the other party;

monitoring the transmission headers for requests to change the priority assignments; and

changing the priority assignments in response to the requests, whereby the RF bandwidth is allocated among the plurality of signals in accordance with the requests.

20. The method of claim 19, wherein the priority assignments are changed incrementally until the requests have stopped.

21. A method of communicating a plurality of signals within an RF bandwidth, comprising the steps of:

making priority assignments to each of the plurality of signals;

transmitting the plurality of signals within the RF bandwidth according to the priority assignments, wherein the transmitted signals occupy the RF bandwidth in portions specified by the priority assignments;

buffering the signals prior to the step of making the priority assignments, wherein the signals are buffered on a first-in, first-out basis;

receiving a transmission;

demodulating the transmission;

separating the transmission into video, audio and data signal;

decompressing the video signal according to a rate embedded in the video signal; and

decompressing the audio signal according to a rate embedded in the audio signal.