Method of providing end-to end connection in a unified optical and coaxial network

• US 8,842,991 B2
• Filed: 06/28/2012
• Issued: 09/23/2014
• Est. Priority Date: 06/28/2011
• Status: Active Grant

• Current Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Inventors: Liang, Haixiang, Fang, Liming, Chen, Jim, El Bakoury, Hesham
• Primary Examiner(s): Bello, Agustin
• Application Number:
  US13/535,581
• Publication Number:
  US 20130004155A1
• Time in Patent Office: 817 Days
• Field of Search: 398 66- 73
• US Class Current: 398/72
• CPC Class Codes: H04L 12/2801 Broadband local area networks
• CPC Class Codes: H04Q 11/0067 Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
• CPC Class Codes: H04Q 11/0071 Provisions for the electrical-optical layer interface
• CPC Class Codes: H04Q 2011/0079 Operation or maintenance aspects

Abstract

A method in a network device for providing end-to-end connection in a unified optical and coax network, comprising receiving at an integrated node device (IND) a frame from an optical line terminal (OLT), wherein the frame comprises a data frame and a logical link identifier (LLID), and placing the data in a one of a plurality of buffers based on the LLID, wherein the one of the plurality of buffers corresponds to a customer premises equipment (CPE) associated with the LLID, wherein the data frame stays intact in a media access control (MAC) layer.

Claims

1. A method in a network device for providing end-to-end connection in a unified optical and coax network, comprising:

receiving at an integrated node device (IND) an Ethernet passive optical network (EPON) multi-point control protocol (MPCP) message from an optical line terminal (OLT);

scheduling coax data communications by forwarding to a customer premises equipment (CPE) a coax MPCP message that emulates the EPON MPCP message;

receiving at the IND a data frame from an optical line terminal (OLT), wherein the data frame comprises data and a logical link identifier (LLID) associated with the CPE;

placing the data frame in one of a plurality of buffers based on the LLID, wherein one of the plurality of buffers corresponds to the CPE, wherein the data frame stays intact in a media access control (MAC) layer;

transmitting the data frame to the CPE from the IND using modulation substantially optimized for a channel to the CPE,

wherein the transmitted data frame comprises the LLID from the OLT.

2. The method of claim 1, wherein the frame comprises a passive optical network (PON) scheduling message, and wherein the method further comprises translating with a processor the PON scheduling message into a coax scheduling message.

3. The method of claim 1, wherein Operation, Administration, and Maintenance (OAM) and provisioning messages are targeted to the CPE, pass through the IND, and are terminated at the CPE.

4. The method of claim 1, further comprising performing coax dynamic bandwidth allocation (DBA) based on EPON DBA information received from the OLT.

5. The method of claim 4, further comprising building a coax MAC control in the IND to manage conversion between coax MPCP and coax DBA based on EPON MPCP and EPON DBA.

6. A system for providing end-to-end connection in a unified optical and coax network, comprising:

an optical line terminal (OLT);

an integrated node device (IND) coupled to the OLT, wherein the IND comprises;

an optical network unit (ONU), a buffer manager, and a plurality of buffers; and

an Ethernet over coax (EoC) head end (HE); and

a plurality of customer premises equipment (CPEs),

wherein the ONU is configured to receive frames from the OLT,

wherein the frames comprise a data frame and a logical link identifier (LLID),

wherein the EoC HE is configured to schedule and transmit the data frame to at least one of the CPEs using modulation substantially optimized for a channel to the CPE,

wherein the buffer manager is configured to place the data frame and a coax media access control (MAC) control message in one of the plurality of buffers based on the LLID wherein the one of the plurality of buffers corresponds to a one of the plurality of CPEs, and

wherein the IND is configured to receive downstream data frames in a physical (PHY) layer in a broadcast mode from a fiber and convert the downstream data frames to a multicast mode on a coax cable based on the LLID by transmitting the downstream data frames to all members of an associated multicast group, and

wherein Operation, Administration, and Maintenance (OAM) messages and provisioning messages are each targeted to one of the plurality of CPEs, pass through the IND, and are terminated at the targeted CPE.

7. The system of claim 6, wherein each of the frames further comprise an Ethernet passive optical network (EPON) media access control (MAC) control message, wherein the IND further comprises a translator, and wherein the translator is configured to build the coax MAC control message based on the EPON MAC control message.

8. The system of claim 6, wherein the ONU comprises a plurality of virtual MACs that each act as a proxy to a corresponding one of a plurality of CPEs so that the one of the plurality of CPEs is visible to and manageable by the OLT.

9. The system of claim 6, wherein a delay in a coax cable segment is set with a fixed value to allow upstream data from a one of the plurality of CPEs to arrive at the IND before scheduling on a fiber to the OLT.

10. The system of claim 6, wherein the data frame stays intact from an optical fiber to a coax cable.

11. The system of claim 7, wherein the coax MAC control acts as a slave for the EPON MAC control message.

12. The system of claim 6, wherein at least one downstream data frame in a physical (PHY) layer is converted from a broadcast mode on a fiber to a unicast mode on a coax cable based on the LLID to substantially optimize efficiency on the coax cable and to reduce CPE PHY demodulation requirements.

13. An integrated node device (IND) for providing end-to-end connection in a unified optical and coax network, comprising:

an optical network unit (ONU) for receiving a plurality of frames from and transmitting a plurality of frames to an optical line terminal (OLT), wherein each of the plurality of frames from the OLT comprise a data frame and a logical link identifier (LLID);

a buffer manager;

a plurality of buffers; and

an Ethernet over coax (EoC) head end (HE) for receiving a plurality of frames from and transmitting a plurality of frames to a plurality of customer premises equipment (CPEs),

wherein the buffer manager is configured to place the data frame from the OLT in one of the plurality of buffers based on the LLID,

wherein each of the plurality of buffers corresponds to a one of the plurality of CPEs,

wherein the LLID identifies a respective one of the plurality of CPEs,

wherein the EoC HE is configured to schedule and transmit the data frame from the one of the plurality of buffers to the corresponding one of the plurality of CPEs using modulation substantially optimized for a channel to the CPE,

wherein the EoC HE is further configured to receive downstream data frames in a physical (PHY) layer in a broadcast mode from a fiber and convert the downstream data frames to a multicast mode on a coax cable based on the LLID by transmitting the downstream data frames to all members of an associated multicast group, and

wherein Operation, Administration, and Maintenance (OAM) messages and provisioning messages are each targeted to one of the plurality of CPEs, pass through the IND, and are terminated at the targeted CPE.

14. The IND of claim 13, wherein each of the frames further comprise an Ethernet passive optical network (EPON) media access control (MAC) control message, and wherein the IND further comprises a translator configured to build a coax MAC control message based on the EPON MAC control message.

15. The IND of claim 13, wherein the ONU comprises a plurality of virtual media access control (MACs) that each act as a proxy to a corresponding one of plurality of CPEs so that the one of the plurality of CPEs is visible to and manageable by the OLT.

16. The IND of claim 13, wherein a delay in a coax cable segment is set with a fixed value to allow upstream data from a one of the plurality of CPEs to arrive at the IND before scheduling on a fiber to the OLT.

17. The IND of claim 13, wherein the data frame stays intact from an optical fiber to a coax cable.

18. The IND of claim 14, wherein the coax MAC control acts as a slave for the EPON MAC control message.

19. The IND of claim 13, wherein at least one downstream data frame in a physical (PHY) layer is converted from a broadcast mode on a fiber to a unicast mode on a coax cable based on the LLID to substantially optimize efficiency on the coax cable and to reduce CPE PHY demodulation requirements.

20. An apparatus comprising:

a first interface configured to connect to an Ethernet Passive Optical Network (EPON);

a second interface configured to connect to a EPON over Coaxial (EPoC) network; and

a processor coupled to the interfaces and configured to cause the apparatus to;

forward Operation, Administration, and Maintenance (OAM) frames between the EPON network and the EPoC network, wherein the apparatus does not terminate an OAM management domain for Customer Premises Equipment (CPEs) coupled to the EPoC network; and

place received frames in queues associated with logical links until the associated logical link is scheduled for transmission.

21. The apparatus of claim 20, wherein the processor is further configured to cause the apparatus to support downstream multicast transmission by transmitting to multicast service groups based on frame Logical Link Identifiers (LLIDs).