Method and system for determination and exchange of network timing information

• US 8,325,616 B2
• Filed: 01/17/2008
• Issued: 12/04/2012
• Est. Priority Date: 01/17/2008
• Status: Expired due to Fees

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Huang, Weida, Kim, Yongbum
• Primary Examiner(s): Hailu, Kibrom T
• Assistant Examiner(s): Chery, Dady
• Application Number:
  US12/015,671
• Publication Number:
  US 20090185501A1
• Time in Patent Office: 1,783 Days
• Field of Search: 370/241, 370/252, 370/251, 370/241.1, 370/244, 398/154
• US Class Current: 370/252
• CPC Class Codes: H04L 43/026 using flow identification
• CPC Class Codes: H04L 43/0852 Delays

Abstract

Aspects of a method and system for determination and exchange of network timing information are provided. In this regard, for each network hop traversed by a packet, a propagation delay of said network hop may be determined. Moreover, the propagation delay, and/or a hop length calculated utilizing the propagation delay, may be appended to the packet. The packet may, for example, be a MMRP registration packet or a SRP reservation packet. The packet may be dropped in instances that the propagation delay and/or length of a one or more traversed network hops is outside a determined range. The hop length may be determined by multiplying the propagation delay by a speed of propagation on the hop. The speed of propagation may be determined based on the physical layer technology associated with the network hop. Digital rights management may be implemented for media communicated on the network hop based at least in part on the hop length or the propagation delay. In this regard, use of media content may be restricted to a specified location.

Claims

1. A method for networking, the method comprising:

performing by one or more circuits and/or processors in a network node;

receiving a packet via a network physical link, wherein said received packet comprises a plurality of time stamps of one or more sending nodes traversed by said received packet along said network physical link;

determining, utilizing said plurality of time stamps of said one or more sending nodes, a propagation delay of said network physical link;

calculating, utilizing said determined propagation delay, a length of said network physical link by multiplying said determined propagation delay by a speed of propagation along said network physical link;

appending, to said packet, one or both of;

said determined propagation delay; and

said length of said network physical link.

2. The method according to claim 1, wherein said packet is a multiple multicast registration protocol (MMRPI registration packet.

3. The method according to claim 1, wherein said packet is a Stream Reservation Protocol (SRPI reservation packet.

4. The method according to claim 3, comprising dropping said packet when said determined propagation delay or said determined length of said network physical link is outside a determined range.

5. The method according to claim 3, comprising dropping said packet when a total propagation delay of all network physical links traversed by said packet or a total length of all network physical links traversed by said packet is outside a determined range.

6. The method according to claim 1, wherein said speed of propagation is determined based on a physical layer technology associated with said network physical link.

7. The method according to claim 1, comprising establishing digital rights management for media content communicated via said network physical link based, at least in part, on said length of said network physical link or said propagation delay.

8. The method according to claim 7, comprising limiting, via said digital rights management, use of media content to a specified location based on said length of said network physical link or said propagation delay.

9. A non-transitory storage having stored thereon, a computer program having at least one code section for networking, the at least one code section being executable by a machine for causing the machine to perform steps comprising:

receiving a packet via a network physical link, wherein said received packet comprises a plurality of time stamps of one or more sending nodes traversed by said received packet along said network physical link;

determining, utilizing said plurality of time stamps of said one or more sending nodes, a propagation delay of said network physical link;

determining, utilizing said propagation delay, a length of said network physical link by multiplying said determined propagation delay by a speed of propagation along said network physical link; and

appending, to said packet, one or both of;

said determined propagation delay; and

said length of said network physical link.

10. The machine-readable storage according to claim 9, wherein said packet is a multiple multicast registration protocol (MMRP) registration packet.

11. The machine-readable storage according to claim 9, wherein said packet is a Stream Reservation Protocol (SRP) reservation packet.

12. The machine-readable storage according to claim 11, wherein said at least one code section comprises code for dropping said packet when said determined propagation delay or said determined length of said network physical link is outside a determined range.

13. The machine-readable storage according to claim 11, wherein said at least one code section comprises code for dropping said packet when a total propagation delay of all network physical links traversed by said packet or a total length of all network physical links traversed by said packet is outside a determined range.

14. The machine-readable storage according to claim 9, wherein said speed of propagation is determined based on a physical layer technology associated with said network physical link.

15. The machine-readable storage according to claim 9, wherein said at least one code section comprises code for establishing digital rights management for media content communicated via said network physical link based, at least in part, on said length of said physical link or said propagation delay.

16. The machine-readable storage according to claim 15, wherein said at least one code section comprises code for limiting, via said digital rights management, use of media content to a specified location based on said length of said network physical link or said propagation delay.

17. A system for networking, the system comprising:

one or more circuits and/or processors in a network node that are operable to;

receive a packet via a network physical link, wherein said received packet comprises a plurality of time stamps of one or more sending nodes traversed by said received packet along said network physical link;

determine, utilizing said plurality of time stamps of said one or more sending nodes, a propagation delay of said network physical link;

determine, utilizing said propagation delay, a length of said network physical link by multiplying said determined propagation delay by a speed of propagation along said network physical link; and

append, to said packet, one or both of;

said determined propagation delay; and

said length of said network physical link.

18. The system according to claim 17, wherein said packet is a multiple multicast registration protocol (MMRP) registration packet.

19. The system according to claim 17, wherein said packet is a Stream Reservation Protocol (SRP) reservation packet.

20. The system according to claim 19, wherein said one or more circuits and/or processors are operable to drop said packet when said determined propagation delay or said determined length of said network physical link is outside a determined range.

21. The system according to claim 19, wherein said one or more circuits and/or processors are operable to drop said packet when a total propagation delay of all network physical links traversed by said packet or a total length of all network physical links traversed by said packet is outside a determined range.

22. The system according to claim 17, wherein said speed of propagation is determined based on a physical layer technology associated with said network physical link.

23. The system according to claim 17, wherein said one or more circuits and/or processors are operable to establish digital rights management for media content communicated via said network physical link based, at least in part, on said length of said network physical link or said propagation delay.

24. The system according to claim 23, wherein said one or more circuits and/or processors are operable to limit, via said digital rights management, use of media content to a specified location based on said length of said network physical link or said propagation delay.