Transmission apparatus and method of multi-service tributaries over RPR

• US 7,428,211 B2
• Filed: 11/18/2002
• Issued: 09/23/2008
• Est. Priority Date: 11/18/2002
• Status: Expired due to Term

• Current Assignee: Fiberhome Telecommunications Technologies Company Limited (Wuhan Research Institute of Posts and Telecommunications)
• Original Assignee: Wuhan Fiberhome Networks Co. Ltd.
• Inventors: Yu, Shaohua
• Primary Examiner(s): HSU, ALPUS
• Application Number:
  US10/535,473
• Publication Number:
  US 20060126651A1
• Time in Patent Office: 2,136 Days
• Field of Search: 370/223, 370/395.65, 370/404, 398/4, 709/251
• US Class Current: 370/223
• CPC Class Codes: H04L 12/433 with asynchronous transmission, e.g. token ring, register insertion
• CPC Class Codes: H04L 12/437 Ring fault isolation or reconfiguration for SDH/SONET ring networks H04J3/085
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 45/247 using M:N active or standby paths

Abstract

A data transmission apparatus used in a multiple service ring is described. The apparatus includes at least two nodes coupled to at least one aggregate pipe and at least one tributary. The apparatus also includes a tributary TX framer for converting data received from the tributary, a transmission setup module for setting up information for processing protocol packets to be transmitted, a TX framer for encapsulating the information into frames of the MSR and transmitting the same along the aggregate pipe to a downstream neighbor node in the ring, and a RX framer for receiving and deframing data frames of the MSR from a upstream neighbor node. The apparatus also includes a transiting module for transiting the frames to the TX framer, a destination tributary determining module for determining a destination tributary, and a tributary RX framer for converting and sending protocol packets to a corresponding tributary.

Claims

1. A data transmission apparatus used in a multiple service ring (MSR) including at least two nodes coupled to at least one aggregate pipe and at least one tributary, said apparatus comprising:

a tributary TX framer coupled to said tributaries for converting data received from said tributaries into XP processing protocol data packets;

a transmission setup module for setting-up information indicating the destination node address and destination tributary for XP packets to be transmitted;

a TX framer for encapsulating said information indicating the destination node address and destination tributary and the XP packets into frames of the multiple service ring and transmitting the same along an aggregate pipe to a downstream neighbor node in the ring;

a RX framer for receiving and deframing data frames of the multiple service ring from a upstream neighbor node along an aggregate pipe to obtain at least a destination node address and XP packets;

a transiting module for transiting the frames destined to other nodes to said TX framer so as to forward the frames destined to other nodes to a next node;

a destination tributary determining module for determining a destination tributary of the XP packets for local node; and

a tributary RX framer for converting said XP packets for local node from the RX framer into data of format of local tributary and sending the local tributary data to a corresponding tributary determined by said destination tributary determining module,

wherein said multiple service ring is based on RPR Lite, and said RX framer is RPR MAC RX framer and said TX framer is RPR MAC TX framer.

2. The data transmission apparatus according to claim 1, wherein said transiting module transits the frames destined to other nodes at a fast and almost fixed rate.

3. The data transmission apparatus according to claim 1, wherein said destination tributary determining module includes a discriminator for determining whether said received packets for local node are unicast, multicast or broadcast;

a tributary member copying module for making copies of the packets for each of the corresponding tributary if multicast or broadcast is determined within a membership group in a node; and

tributary identifier determining module for determining destination tributary from TT and TN fields in the received frames.

4. The data transmission apparatus according to claim 3, wherein said transmission setup module sets up destination node address (NA), and TT and TN fields for indicating the type and NO. of the destination tributary.

5. The data transmission apparatus according to claim 4, further comprising a Tx schedule unit for scheduling the transmission of data frames according to a priority of the frames, and decide which frame will go first to the downstream along the ringlet.

6. The data transmission apparatus according to claim 5, further comprising a TTBP unit for performing tributary based protection to provide at least one tributary to be used as a standby in case of failure of the used tributaries.

7. The data transmission apparatus according to claim 6, wherein said TTBP unit provides 1+1 TTBP to designate a mate Standby Tributary with the same service property, source and sink in which payloads of the mate Working Tributary and Standby Tributary carries the same traffic, and Once TTBP occurred for this working tributary, said standby will replace this working tributary within 50 ms.

8. The data transmission apparatus according to claim 6, wherein said TTBP unit provides 1:

1 TTBP to designate a mate Standby Tributary with the same service property, source and sink in which payloads of the Standby Tributary can run the other additional traffic, and once TTBP occurred for this Working Tributary, the additional traffic will be dropped out within 50 ms.

9. The data transmission apparatus according to claim 6, wherein said TTBP unit provides 1:

N TTBP to designate a mate Standby Tributary with the same service property, source and sink in which payloads of the Standby Tributary runs the other additional traffic, and once TTBP in one of N Working Tributary occurred, this additional traffic will be dropped out within 50 ms.

10. The data transmission apparatus according to claim 3, wherein said tributary includes bandwidth management unit with symmetry and asymmetry and tributary based filter targeting at one or more fields of MAC frame, XP frame, IP packet or TCP/UDP packet.

11. The data transmission apparatus according to claim 10, wherein said MSR does not use Fairness arithmetic and uses either a local or a global node address, and pre-plan strategy.

12. The data transmission apparatus according to claim 4, further comprising a frame sequence number generator for generating frame sequence number sequentially with respect to a specified modulus for each of the data frames to be transmitted at the transmitting side;

and

at the receiving side, a FSN extractor for extracting a FSN with respect to a peer-to-peer modulus from the received data frames;

a counter at the receiving side for counting the number of the received data frames; and

a comparator for comparing the counted frame number with the extracted FSN, if mismatch, an error reflecting transport performance is indicated.

13. The data transmission apparatus according to claim 12, wherein said destination tributary determining module gets TT, TN, a value of CS&

NM and FSN from the received frames from the upstream node, and said transmission setup module attaches TT, TN, a value of CS&

NM and FSN into the data frames to be transmitted.

14. The data transmission apparatus according to claim 13, wherein said RPR framer, and the transiting module are of IEEE802.17 MAC layer;

said tributary RX framer, said transmission setup module, and said destination tributary determining module, said FSN generator, FSN extractor, counter, and comparator are of the XP layer, and said tributary TX framer is of tributary processing layer.

15. The data transmission apparatus according to claim 14, wherein said tributary processing layer further comprises a tributary adaptation function unit for said signal and rate transform, synchronous function between two sides of peer to peer.

16. A data transmission method used in a multiple service ring including at least two nodes coupled to at least one aggregate pipe and at least one tributary, said apparatus comprising:

receiving data from a tributary and converting the received data into XP processing protocol data packets;

setting-up information indicating the destination node address and destination tributary for XP packets to be transmitted;

encapsulating said information indicating the destination node address and destination tributary and the XP packets into frames of the multiple service ring and transmitting the same along an aggregate pipe to a downstream neighbor node in the ring;

receiving and deframing data frames of the multiple service ring from a upstream neighbor node along an aggregate pipe to obtain at least a destination node address and XP packets;

transiting the frames destined to other nodes so as to forward the frames destined to other nodes to a next node;

determining a destination tributary of the XP packets for local node; and

converting said XP packets for local node into data of format of local tributary and sending the local tributary data to a corresponding tributary determined by said destination tributary determining step,

wherein said multiple service ring is based on RPR Lite, and said RX framer is RPR MAC RX framer and said TX framer is RPR MAC TX framer.

17. The data transmission method according to claim 16, wherein said transiting step transits the frames destined to other nodes at a fast and almost fixed rate.

18. The data transmission method according to claim 16, wherein said destination tributary determining step includes a discriminating step for determining whether said received packets for local node are unicast, multicast or broadcast;

a tributary member copying module for making copies of the packets for each of the corresponding tributary if multicast or broadcast is determined within a membership group in a node; and

tributary identifier determining module for determining destination tributary from TT and TN fields in the received frames.

19. The data transmission method according to claim 18, wherein said transmission setup step sets up destination node address (NA), and TT and TN fields for indicating the type and NO. of the destination tributary.

20. The data transmission method according to claim 19, further comprising a Tx scheduling step before the TX framing step for scheduling the transmission of data frames according to a priority of the frames, and decide which frame will go first to the downstream along the ringlet.

21. The data transmission method according to claim 20, further comprising a TTBP step for performing tributary based protection to provide at least one tributary to be used as a standby in case of failure of the used tributaries.

22. The data transmission method according to claim 21, wherein said TTBP step provides 1+1 TTBP to designate a mate Standby Tributary with the same service property, source and sink in which payloads of the mate Working Tributary and Standby Tributary carries the same traffic, and Once TTBP occurred for this working tributary, said standby will replace this working tributary within 50 ms.

23. The data transmission method according to claim 21, wherein said TTBP step provides 1:

1 TTBP to designate a mate Standby Tributary with the same service property, source and sink in which payloads of the Standby Tributary can run the other additional traffic, and once TTBP occurred for this Working Tributary, the additional traffic will be dropped out within 50 ms.

24. The data transmission method according to claim 21, wherein said TTBP step provides 1:

N TTBP to designate a mate Standby Tributary with the same service property, source and sink in which payloads of the Standby Tributary runs the other additional traffic, and once TTBP in one of N Working Tributary occurred, this additional traffic will be dropped out within 50 ms.

25. The data transmission method according to claim 18, wherein said tributary includes bandwidth management with symmetry and asymmetry and tributary based filter targeting at one or more fields of MAC frame, XP frame, IP packet or TCP/UDP packet.

26. The data transmission method according to claim 25, wherein said MSR does not use Fairness arithmetic and uses either a local or a global node address, and pre-plan strategy.

27. The data transmission method according to claim 19, further comprising the steps of:

generating frame sequence number sequentially with respect to a specified modulus for each of the data frames to be transmitted at the transmitting side; and

at the receiving side, extracting a FSN with respect to a peer-to-peer modulus from the received data frames;

counting the number of the received data frames; and

comparing the counted frame number with the extracted FSN, if mismatch, an error reflecting transport performance is indicated.

28. The data transmission method according to claim 27, wherein said destination tributary determining step gets TT, TN, a value of CS&

NM and FSN from the received frames from the upstream node, and said transmission setup step attaches TT, TN, a value of CS&

NM and FSN into the data frames to be transmitted.

29. The data transmission method according to claim 28, wherein said RPR framing, and the transiting are performed in IEEE802.17 MAC layer;

said tributary RX framing, said transmission setup step, and said destination tributary determining step, said FSN generating, FSN extracting, counting, and comparing steps are performed in the XP layer, and said tributary TX framing is performed in the tributary processing layer.

30. The data transmission method according to claim 29, wherein said tributary processing layer further comprises a tributary adaptation function for said signal and rate transform, synchronous function between two sides of peer to peer.