Full duplex network architecture in cable network environments

• US 9,942,024 B2
• Filed: 02/24/2016
• Issued: 04/10/2018
• Est. Priority Date: 07/15/2015
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Jin, Hang, Chapman, John T.
• Primary Examiner(s): Jangbahadur, Lakeram
• Application Number:
  US15/052,428
• Publication Number:
  US 20170019241A1
• Time in Patent Office: 776 Days
• CPC Class Codes: H04B 3/20 Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
• CPC Class Codes: H04B 3/32 Reducing cross-talk, e.g. by compensating
• CPC Class Codes: H04B 3/487 Testing crosstalk effects
• CPC Class Codes: H04L 12/2801 Broadband local area networks
• CPC Class Codes: H04L 5/1461 Suppression of signals in the return path, i.e. bidirectional control circuits

Abstract

An example communication system comprises a media access control (MAC) scheduler in a cable network, and a full band transceiver. The MAC scheduler implements a two-dimensional transmission-reception (T-R) coordination scheme among a plurality of cable modems in the cable network. According to the T-R coordination scheme, the cable modems are categorized into interference groups, such that no cable modem of any one interference group transmits upstream in a frequency range simultaneously as another cable modem in the same interference group receives downstream in the frequency range, facilitating full duplex communication in the cable network across the frequency range. The full band transceiver implements an adaptive interference cancellation scheme, which suppresses at a receiver of the respective component, a signal transmitted by a transmitter of the respective component. The communication system further includes a full band amplifier, implementing the adaptive interference cancellation scheme and a ringing suppression scheme with echo cancellation.

Claims

1. A communication system, comprising:

a media access control (MAC) scheduler in a cable network, wherein the MAC scheduler implements a two-dimensional transmission-reception (T-R) coordination scheme among a plurality of cable modems in the cable network, wherein according to the T-R coordination scheme, the cable modems are categorized into interference groups, wherein no cable modem of any one interference groups transmits upstream in a frequency range simultaneously as another cable modem in the same interference group receives downstream in the frequency range, facilitating full duplex communication in the cable network across the frequency range,

wherein the MAC scheduler implements the T-R coordination centrally in the cable network, wherein according to the centrally implemented T-R coordination scheme, the MAC scheduler partitions resource blocks available to any one interference group into at least a first portion and a second portion, wherein the first portion is reserved for upstream transmission, and the second portion is reserved for downstream reception, wherein the first portion and the second portion do not overlap for any cable modem in the interference group; and

a full band transceiver implementing an adaptive interference cancellation scheme suppressing at a receiver of the transceiver a signal transmitted by a transmitter of the transceiver.

2. The communication system of claim 1, further comprising a full band amplifier implementing the adaptive interference cancellation scheme and a ringing suppression scheme implementing echo cancellation.

3. The communication system of claim 1, wherein cable modems in different interference groups transmit upstream and receive downstream simultaneously in the frequency range.

4. The communication system of claim 1, wherein the cable modems are classified into the interference groups through a ranging process.

5. The communication system of claim 1, further comprising the plurality of cable modems.

6. The communication system of claim 5, wherein the cable modems operate in simplex mode, and support full band operation for downstream reception and upstream transmission.

7. The communication system of claim 1, further comprising a tap and a splitter supporting full band communication in the cable network.

8. The communication system of claim 1, wherein the MAC scheduler executes in a cable modem termination system (CMTS) of the cable network.

9. The communication system of claim 8, wherein the CMTS comprises a core and a physical interface (PHY) module, wherein the PHY module comprises the full band transceiver.

10. A method, comprising:

operating a media access control (MAC) scheduler implementing a two-dimensional T-R coordination scheme among a plurality of cable modems in a cable network, wherein according to the T-R coordination scheme, the cable modems are categorized into interference groups, wherein no cable modem of any one interference group transmits upstream in a frequency range simultaneously as another cable modem in the same interference group receives downstream in the frequency range, facilitating full duplex communication in the cable network across the frequency range,

wherein the MAC scheduler implements the T-R coordination in a distributed manner in the cable network, wherein according to the distributed T-R coordination scheme, cable modems manage scheduling upstream transmission and downstream reception in any one interference group, wherein the MAC scheduler transmits a downstream map ahead of downstream transmission to the plurality of cable modems, wherein the cable modems schedule respective upstream transmission according to the downstream map; and

operating a full band transceiver implementing an adaptive interference cancellation scheme suppressing at a receiver of the transceiver a signal transmitted by a transmitter of the transceiver.

11. The method of claim 10, further comprising operating a full band amplifier implementing the adaptive interference cancellation scheme and a ringing suppression scheme implementing echo cancellation.

12. The method of claim 10, wherein cable modems in different interference groups transmit upstream and receive downstream simultaneously in the frequency range.

13. The method of claim 10, wherein the cable modems operate in simplex mode, and support full band operation for downstream reception and upstream transmission.

14. The method of claim 10, further comprising operating a tap and a splitter supporting full band communication in the cable network.

15. An apparatus in a cable network, comprising:

a media access control (MAC) scheduler comprising a processor and a memory, wherein the apparatus facilitates dull duplex communication in the cable network through implementing a two-dimensional T-R coordination scheme among a plurality of cable modems in the cable network, wherein according to the T-R coordination scheme, the cable modems are categorized into interference groups, wherein no cable modem of any one interference group transmits upstream in a frequency range simultaneously as another cable modem in the same interference group receives downstream in the frequency range, facilitating full duplex communication in the cable network across the frequency range,

wherein the MAC scheduler implements the T-R coordination centrally in the cable network, wherein according to the centrally implemented T-R coordination scheme, the MAC scheduler partitions resource blocks available to any one interference group into at least a first portion and a second portion, wherein the first portion is reserved for upstream transmission, and the second portion is reserved for downstream reception, wherein the first portion and the second portion do not overlap for any cable modem in the interference group, wherein the apparatus is connected in the cable network to the plurality of cable modems, and

wherein the apparatus is connected to a full band transceiver implementing an adaptive interference cancellation scheme suppressing at a receiver of the transceiver a signal transmitted by a transmitter of the transceiver.

16. The apparatus of claim 15, further comprising a full band amplifier implementing the adaptive interference cancellation scheme and a ringing suppression scheme implementing echo cancellation.

17. The apparatus of claim 15, wherein the cable modems in different interference groups transmit upstream and receive downstream simultaneously in the frequency range.

18. The apparatus of claim 15, wherein the cable modems are classified into the interference groups through a ranging process.