Enhanced channel access mechanisms for an HPNA network

• US 7,606,258 B1
• Filed: 06/29/2007
• Issued: 10/20/2009
• Est. Priority Date: 02/20/2001
• Status: Expired due to Fees

• Current Assignee: Microsoft Corporation
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Sherman, Matthew J., Lin, Wei
• Primary Examiner(s): Moore, Jr.; Michael J
• Assistant Examiner(s): Mais; Mark A
• Application Number:
  US11/824,364
• Time in Patent Office: 844 Days
• Field of Search: 370/230, 370/235, 370/242, 370/245, 370/252, 370351-355, 370/357, 370/392, 370/400, 370/401, 370/404, 370/419, 370/420, 370/437, 370/447, 370/448, 370/450, 370/451, 370/453, 370/455, 370/462, 370/464, 370/465, 370/508, 370/516, 370/517, 370/519, 370/528
• US Class Current: 370/447
• CPC Class Codes: H04L 12/00 Data switching networks interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units G06F13/00
• CPC Class Codes: H04L 12/2803 Home automation networks
• CPC Class Codes: H04L 12/2838 Distribution of signals within a home automation network, e.g. involving splitting/multiplexing signals to/from different paths adaptations of television systems for transmission by electric cable for domestic distribution H04N7/106; hybrid transport H04L12/6418; home network arrangements specially adapted for distribution of digital video signals H04N7/24
• CPC Class Codes: H04L 12/40156 by using dedicated slots associated with a priority level
• CPC Class Codes: H04L 12/403 with centralised control, e.g. polling
• CPC Class Codes: H04L 12/4625 Single bridge functionality, e.g. connection of two networks over a single bridge
• CPC Class Codes: H04L 2012/2845 Telephone line
• CPC Class Codes: H04L 2012/5603 Access techniques
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

A method and a system provide access to a communications medium that is suitable for allowing use of a plurality of Home Phoneline Network Association (HPNA) v2 frames in a centralized manner. Each HPNA v2 frame is timed to allow an Inter-Frame Gap (IFG) portion having a duration that is substantially a duration defined by an HPNA v2 protocol specification for an IFG portion of an HPNA v2 frame. A plurality of frames are generated in the communications medium with at least one frame of the plurality of frames having timing to allow a Shortened Inter-Frame Gap (SIFG) portion and a contention-free portion. The SIFG portion is less than about 17 μsec in duration. Access to the communications medium is then provided for at least one station (STA) during the contention-free portion of a frame having timing to allow the SIFG portion.

Claims

1. A method comprising:

on a communications medium adapted to use Home Phoneline Network Association (HPNA) v2 frames, generating at least one enhanced frame comprising a message, each sequential pair of enhanced frames having timing to allow a Shortened Inter-Frame Gap (SIFG), each SIFG having a duration that is not recognized by a HPNA v2 STA as a duration defined by an HPNA v2 protocol specification for an Inter-Frame Gap IFG and permitting each enhanced frame priority over pending HPNA v2 frames, the SIFG comprising a blocking signal adapted to prevent the HPNA v2 STA from recognizing an existence of the SIFG.

2. The method according to claim 1, further comprising

generating the message.

3. The method according to claim 1, further comprising

generating the message, the message adapted for transmission to an enhanced station (STA), the enhanced STA being one of a Media Control Station (MC STA) and a non-Media Control Station (non-MC STA).

4. The method according to claim 1, wherein each HPNA v2 frame is timed to allow an Inter-Frame Gap (IFG) having a duration that is substantially a duration defined by the HPNA v2 protocol specification.

5. The method according to claim 1, wherein each SIFG is less than approximately 17 μ

sec in duration.

6. The method according to claim 1, wherein the at least one enhanced frame includes an End-of-Frame (EOF) sequence portion.

7. The method according to claim 1, the at least one enhanced frame includes an End-of-Frame (EOF) sequence portion that is different from an EOF sequence defined by an HPNA v2 protocol specification for an EOF sequence of an HPNA v2 frame.

8. The method according to claim 1, wherein the at least one enhanced frame has an End of Frame (EOF) sequence portion that comprises a preamble that is different from a preamble defined by an HPNA v2 protocol specification for a preamble of an HPNA v2 frame.

9. The method according to claim 1, wherein the at least one enhanced frame includes a Time Duration (TD) field containing information relating to a duration of the at least one enhanced frame.

10. The method according to claim 1, wherein at least one enhanced frame comprises a preamble that is different from a preamble defined by the HPNA v2 protocol specification for a preamble of an HPNA v2 frame.

11. The method according to claim 1, wherein the at least one enhanced frame includes a Time Duration (TD) field containing information relating to a duration of the at least one enhanced frame.

12. The method according to claim 1, further comprising

providing contention-free access to the communications medium during each enhanced frame so that only one enhanced station at a time sends a message during an enhanced frame, each enhanced station being one of a Media Control Station (MC STA) and a non-Media Control Station (non-MC STA).

13. A communications network comprising:

a Media Control Station (MC STA) adapted to generate, on a communications medium adapted to use Home Phoneline Network Association (HPNA) v2 frames, at least one enhanced frame comprising a message, each sequential pair of enhanced frames having timing to allow a Shortened Inter-Frame Gap (SIFG), each SIFG having a duration that is not recognized by a HPNA v2 STA as a duration defined by an HPNA v2 protocol specification for an Inter-Frame Gap IFG and permitting each enhanced frame priority over pending HPNA v2 frames, the SIFG comprising a blocking signal adapted to prevent the HPNA v2 STA from recognizing an existence of the SIFG.

14. The communications network according to claim 13, further comprising:

at least one non-Media Control Station (non-MC STA) coupled to the communications medium, the at least one non-Media Control Station (non-MC STA) adapted to receive the at least one enhanced frame.

15. The communications network according to claim 13, wherein each SIFG is less than about 17 μ

sec in duration.

16. The communications network according to claim 13, wherein the at least one enhanced frame comprises an End-of-Frame (EOF) sequence portion.

17. The communications network according to claim 13, wherein the at least one enhanced frame comprises an End-of-Frame (EOF) sequence portion that is different from an EOF sequence defined by an HPNA v2 protocol specification for an EOF sequence of an HPNA v2 frame.

18. The communications network according to claim 13, wherein the at least one enhanced frame comprises an End-of-Frame (EOF) sequence portion that comprises a preamble that is different from a preamble defined by an HPNA v2 protocol specification for a preamble of an HPNA v2 frame.

19. The communications network according to claim 13, wherein the at least one enhanced frame includes a Time Duration (TD) field containing information relating to a duration of the at least one enhanced frame.