CATV network and cable modem system having a wireless return path

• US 5,870,134 A
• Filed: 03/04/1997
• Issued: 02/09/1999
• Est. Priority Date: 03/04/1997
• Status: Expired due to Fees

• Current Assignee: Arris International, Inc. (CommScope Holding Company, Inc.)
• Original Assignee: Com21, Inc.
• Inventors: Baran, Paul, Laubach, Mark
• Primary Examiner(s): GRANT, CHRISTOPHER C
• Application Number:
  US08/810,407
• Time in Patent Office: 707 Days
• Field of Search: 455/5.1, 455/6.1, 455/4.2, 455/6.2, 455/6.3, 455/3.2, 348/6, 348/7, 348/12, 348/13
• US Class Current: 725/123
• CPC Class Codes: H04N 21/6162 involving terrestrial transmission, e.g. DVB-T
• CPC Class Codes: H04N 7/17309 Transmission or handling of upstream communications

Abstract

A two-way CATV network having a radio return path. A cable headend controller is used to control downstream as well as upstream communications over the two-way CATV network. Downstream signals are sent to subscribers'"'"' cable modems through conventional coaxial cables. On the upstream side, a signal generated at a first frequency by an interactive cable modem. This signal is then sent to a transmitter applique, which converts the signal to a second frequency. The signal is then transmitted through a wireless segment at this second frequency to a receiver applique. The receiver applique converts the transmitted signal into a third frequency. In some cases, the first frequency is the same as the third frequency. Eventually, the upstream signal is sent to the headend controller. Throughout the entire upstream transmission process, the same signal is maintained; only its frequency is changed. In the various embodiments, the first, second, and third frequencies are the same; the first frequency is the same as the third frequency but not the second frequency; and the first channel can be the same as the third channel but is not the same as the second channel.

Claims

1. A communication system comprising:

a cable television network;

a head end controller coupled to a cable television network for controlling upstream and downstream communications;

a first set of cable modems coupled to the cable television network, wherein the headend controller transmits a downstream signal through the cable television network to one or more cable modems in a first set of cable modems and each cable modem transmits a first upstream signal on a first upstream channel selected from a first upstream channel group to the headend controller via a first upstream transmission path which includes a transparent multiple channel wireless segment, wherein the transparent multiple channel wireless segment is comprised of;

a plurality of conventional transmitter appliques which converts a first upstream signal on a first upstream channel selected from a first channel group from one or more cable modems to a second upstream signal on second upstream channel selected from a second upstream group suitable for reception by a single conventional receiver applique and wherein in each transmitter applique, there is a one to one distinct translation from each first upstream channel in the first channel group to a corresponding second upstream channel in the second channel group;

a conventional receiver applique which converts a second upstream signal on a second upstream channel selected from a second channel group from to a third upstream signal on a third upstream channel selected from a third upstream group suitable for reception by a headend controller receiver channel, wherein there is a one to one distinct translation from each channel in the second channel group to a corresponding channel in the third channel group.

2. The communication system of claim 1, wherein the transparent wireless segment is comprised of:

a plurality of conventional transmitter appliques which are used to convert a first upstream signal on a first upstream channel selected from a first channel group from one or more cable modems to a second upstream signal on second upstream channel selected from a second upstream channel group suitable for reception by a plurality of conventional receiver appliques, wherein in each transmitter applique, there is one to one distinct translation from each first upstream channel in the first channel group to a corresponding second upstream channel in the second channel group;

a plurality of conventional receiver appliques which are used to convert a second upstream signal on a second upstream channel selected from a second upstream channel group from to a third upstream signal on a third upstream channel selected from a third upstream channel group suitable for reception by a headend controller receiver channel, wherein in each receiver applique there is a one to one distinct translation from each second upstream channel in the second channel group to a corresponding third upstream channel in the third channel group for each receiver applique.

3. The communication system of claim 2, wherein the headend controller includes a duplicate burst suppression function.

4. The communication system of claim 1, further comprising a second set of cable modems coupled to the cable television network, wherein the headend controller transmits a downstream signal through the cable television network to one or more cable modems in the second set of cable modems and one or more of the second set of cable modems transmit a first upstream signal on a first upstream channel selected from a first upstream channel group to the headend controller via a first upstream transmission path which does not include a wireless segment and the headend controller receives on one of the upstream channels, upstream signals from the first set of cable modems and the second set of cable modems;

a second set of cable modems coupled to the cable television network, wherein the headend controller transmits a downstream signal through the cable television network to one or more cable modems in the second set of cable modems and each cable modem in the second set transmits a first upstream signal on a first upstream channel selected from a first upstream channel group to the headend controller via a first upstream transmission path which does not include a wireless segment and the headend controller receives on one of the upstream channels, upstream signals from the first set of cable modems and the second set of cable modems.

5. The communication system of claim 2, further comprising a second set of cable modems coupled to the cable television network, wherein the headend controller transmits a downstream signal through the cable television network to one or more cable modems in the second set of cable modems and each cable modem in the second set transmits a first upstream signal on a first upstream channel selected from a first upstream channel group to the headend controller via a first upstream transmission path which does not include a wireless segment and the headend controller receives on one of the upstream channels, upstream signals from the first set of cable modems and the second set of cable modems.

6. The communication system of claim 3, further comprising a second set of cable modems coupled to the cable television network wherein the headend controller transmits a downstream signal through the cable television network to one or more cable modems in the second set and each cable modem in the second set transmits a first upstream signal on a first upstream channel selected from a first upstream channel group to the headend controller via a first upstream transmission path which does not include a wireless segment and the headend controller receives on one of the upstream channels, upstream signals from the first set of cable modems and the second set of cable modems.

7. The communication system of claim 1, wherein the transparent multiple channel wireless segment is comprised of a plurality of advanced transmitter appliques and one or more advanced receiver appliques.

8. The communication system of claim 7, further comprising a second set of cable modems coupled to the cable television network wherein the headend controller transmits a downstream signal through the cable television network to one or more cable modems in the second set and each cable modem in the second set transmits a first upstream signal on a first upstream channel selected from a first upstream channel group to the headend controller via a first upstream transmission path which does not include a wireless segment and the headend controller receives on one of the upstream channels, upstream signals from the first set of cable modems and the second set of cable modems.

9. A method for wireless communication of digital signal transmission between a source and a plurality of receivers, comprising the steps of:

transmitting a first digital upstream signal by a cable modem on a first upstream channel selected from a set of channels in a first upstream channel group;

receiving the transmitted first digital signal on a first upstream channel by a transmitter applique, wherein multiple received first upstream channels may be processed simultaneously;

generating a second digital upstream signal from the first digital upstream signal on a second upstream channel selected from a set of channels in a second channel group wherein there is a one to one correspondence between each channel in the first upstream channel group with each channel contained in the second upstream channel group,

transmitting the second digital upstream signal by the transmitter applique to a plurality of wireless receivers wherein the same second digital upstream signal is received by at least two receivers;

generating a third digital upstream signal from the second digital upstream signal on a third upstream channel selected from a set of channels in a third channel group wherein there is a one to one correspondence between each channel in the second upstream channel group with each channel contained in the third upstream channel group;

relaying the third digital signal by each receiver to a head end controller through a cable television network via the third upstream channel assigned to the receiver, such that the head end controller receives the same third digital signal relayed through multiple third upstream channels; and

processing the relayed third digital signals by the head end controller to receive a valid first digital signal from the source.

10. The method of claim 9, wherein each digital signal from a plurality of sources share the same upstream channel according to time domain multiplexing.

11. The method of claim 9, wherein the processing step is comprised of comparing the received digital signals to detect duplication.

12. A method for wireless communication of digital signal transmission between a source and a plurality of receivers, comprising the steps of:

transmitting a first digital upstream signal by a cable modem on a first upstream channel selected from a set of channels in a first upstream channel group;

receiving the transmitted first upstream digital signal on a first upstream channel by a transmitter applique wherein multiple received first upstream channels may be processed simultaneously;

generating a second digital upstream signal from the first digital upstream signal on a second upstream channel wherein the second digital signal is encoded with identification information such that at most one receiver applique converts said second upstream signal to a third upstream signal;

transmitting the second digital upstream signal by the transmitter applique to a plurality of wireless receiver appliques wherein the same second digital upstream signal is received by one or more receiver appliques;

receiving the second digital signal by one or more receiver appliques wherein each receiver applique examines the encoded identification of said second signal and if accepted generating a third digital upstream signal from the second digital upstream signal on a third upstream channel selected from a set of channels in a third channel group;

receiving the third upstream digital signal by a headend controller through a cable television network via the third upstream channel assigned to the receivers.

13. The method of claim 12 where the transmitter applique selects the second upstream channel from a set of channels in a second channel group wherein there is a one to one correspondence between each channel in the first upstream channel group with each channel contained in the second upstream channel group.

14. The method of claim 12 where the transmitter applique selects the encoded identification from a set of identifications and there is a one to one correspondence between each channel in the first upstream channel group with the selected identification.

15. The method of claim 12 where the receiver applique selects the third upstream channel from a set of channels in a third channel group wherein there is a one to one correspondence between each identification decoded from the second signal with each channel contained in the third upstream channel group.

16. The method of claim 12 where each digital signal from a plurality of wireless cable modem sources share the same third upstream channel according to time domain multiplexing.

17. The method of claim 12 where each digital signal from a plurality of wired and wireless cable modem sources share the same third upstream channel according to time domain multiplexing.

18. The method of claim 12 wherein each receiver applique simultaneously processes multiple upstream signals on multiple channels.

19. A method for wireless communication of digital signal transmission between a source and a plurality of receivers, comprising the steps of:

generating a first digital upstream signal by a cable modem on a first upstream channel selected from a set of channels in a first upstream channel group wherein the first digital signal is encoded with identification information such that at most one receiver applique converts said first upstream signal to a third upstream signal;

transmitting the first digital upstream signal by a transmitter applique to a plurality of wireless receiver appliques wherein the same first digital upstream signal is received by one or more receiver appliques;

receiving the signal by one or more receiver applique and each receiver examines the encoded identification of a second signal and if accepted generating a third digital upstream signal from a second digital transmitter applique wherein multiple received first upstream channels are processed;

generating a second digital upstream signal from the first digital upstream signal on a second upstream channel selected from a set of channels in a second channel group wherein there is a one to one correspondence between each channel in the first upstream channel group with each channel contained in the second upstream channel group,

transmitting the second digital upstream signal by the transmitter applique to a plurality of wireless receivers wherein the same second digital upstream signal is received by at least two receivers wherein the second digital signals on second digital channels are received by a head end controller such that the head end controller receives the same second digital signal relayed through multiple second upstream channels; and

processing the same second digital signals by the head end controller to receive a valid first digital signal from the source.

20. The method of claim 19 where the receiver applique selects a third upstream channel from a set of channels in a third channel group wherein there is a one to one correspondence between each identification decoded from the second signal with each channel contained in a third upstream channel group.

21. The method of claim 19 where each digital signal from a plurality of wireless cable modem sources share a same third upstream channel according to time domain multiplexing.

22. The method of claim 19 where each digital signal from a plurality of wired and wireless cable modem sources share a same third upstream channel according to time domain multiplexing.