Method and apparatus for filtering multicast port identifier in gigabit-capable passive optical network (GPON) system

• US 8,335,217 B2
• Filed: 01/14/2010
• Issued: 12/18/2012
• Est. Priority Date: 11/04/2009
• Status: Expired due to Fees

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Yoo, Hark, Lee, Dongsoo, Kim, Sung Chang, Lee, Mun Seob, Lee, Youngsuk, Kim, Geun Yong
• Primary Examiner(s): WILSON, ROBERT W
• Application Number:
  US12/687,238
• Publication Number:
  US 20110103382A1
• Time in Patent Office: 1,069 Days
• Field of Search: None
• US Class Current: 370/392
• CPC Class Codes: H04L 12/2874 Processing of data for distribution to the subscribers
• CPC Class Codes: H04L 12/2885 Arrangements interfacing with optical systems optical network equipment H04B10/00; optical multiplexers H04J14/05 and H04J14/07

Abstract

Provided is an apparatus for filtering a multicast port identifier, the apparatus including: a processor to receive an Internet Group Management Protocol (IGMP) message from a switching unit, to verify a traffic reception request received from a subscriber terminal based on the IGMP message, and to store a value in a filtering register based on the traffic reception request; and an Optical Network Unit (ONU) Media Access Control (MAC) manager to filter a packet to be forwarded to the subscriber terminal, using a port identifier for traffic forwarding and reception with the subscriber terminal, and using the value of the filtering register indicating an existence of traffic to be forwarded to the subscriber terminal.

Claims

1. An apparatus for filtering a multicast port identifier, the apparatus comprising:

a processor to receive an Internet Group Management Protocol (IGMP) message from a switching unit, to verify a traffic reception request received from a subscriber terminal based on the IGMP message, and to store a value in a filtering register based on the traffic reception request; and

an Optical Network Unit (ONU) Media Access Control (MAC) manager to filter a packet to be forwarded to the subscriber terminal, using a port identifier for traffic forwarding and reception with the subscriber terminal, and using the value of the filtering register indicating an existence of traffic to be forwarded to the subscriber terminal.

2. The apparatus of claim 1, wherein the switching unit receives the IGMP message from the subscriber terminal, and switches the packet to be forwarded to the subscriber terminal in response to the traffic reception request of the subscriber terminal.

3. The apparatus of claim 1, wherein:

the switching unit gathers statistical information associated with the IGMP message, and

the processor stores the value in the filtering register based on the statistical information.

4. The apparatus of claim 1, wherein:

the switching unit includes a multicast traffic forwarding table, and

the processor stores the value in the filtering register using a value of the multicast traffic forwarding table.

5. The apparatus of claim 1, wherein the processor verifies a traffic forwarding request of the subscriber terminal based on the IGMP message, and stores the value in the filtering register.

6. The apparatus of claim 1, wherein the ONU MAC manager checks a header of the packet to extract the port identifier, and checks the extracted port identifier to determine whether to discard or forward the packet.

7. The apparatus of claim 1, wherein the ONU MAC manager checks a header of the packet to extract the port identifier, and determines whether to discard or forward the packet based on the extracted port identifier or the value of the filtering register.

8. The apparatus of claim 1, wherein the ONU MAC manager either discards the packet based on the value of the filtering register regardless of whether the subscriber terminal corresponds to the port identifier, or verifies whether the subscriber terminal corresponds to the port identifier to thereby determine whether to discard or forward the packet.

9. The apparatus of claim 1, wherein, when the port identifier corresponds to the multicast port identifier, the ONU MAC manager determines whether to discard or forward the packet based on the value of the filtering register.

10. The apparatus of claim 1, wherein the IGMP message includes at least one of an IGMP join message for traffic reception, an IGMP leave message for a channel change, and an IGMP query message.

11. An apparatus for filtering a multicast port identifier, the apparatus comprising:

a processor to store a value in an ONU MAC register of a GPON Encapsulation Mode (GEM) frame according to a multicast traffic reception request received from a subscriber terminal, and to indicate whether to discard the GEM frame; and

an ONU MAC manager to filter the GEM frame based on the value of the ONU MAC register,

wherein the ONU MAC manager either discards the GEM frame based on the value of the ONU MAC register, or verifies whether the subscriber terminal corresponds to the port identifier to thereby determine whether to discard the GEM frame.

12. The apparatus of claim 11, wherein:

when the value of the ONU MAC register corresponds to a first value, the ONU MAC manager discards the GEM frame regardless of whether the subscriber terminal corresponds to the port identifier, and

when the value of the ONU MAC register corresponds to a second value, the ONU MAC manager verifies whether the subscriber terminal corresponds to the port identifier, and when the subscriber terminal does not corresponds to the port identifier, the ONU MAC manager discards the GEM frame.

13. A method of filtering subscriber terminal traffic, the method comprising:

receiving an Internet Group Management Protocol (IGMP) message from the subscriber terminal;

verifying whether traffic forwarding to the subscriber terminal is required based on the IGMP message; and

when traffic forwarding to the subscriber terminal is required, then storing a value in an Optical Network Media (ONU) Media Access Control (MAC) register wherein a ONU MAC Manager uses the value stored in the ONU register to determine whether to discard GPON Encapsulation Mode (GEM) frames by filtering or to forward the GEM frames to the subscriber terminal.

14. The method of claim 13, wherein the verifying comprises verifying that a traffic forwarding request is received from the subscriber terminal when the IGMP message corresponds to an IGMP join message.

15. The method of claim 13, wherein the storing comprises storing a first value in the ONU MAC register when the traffic forwarding to the subscriber terminal is needed, and storing a second value in the ONU MAC register when the traffic forwarding to the subscriber terminal is not needed.

16. The method of claim 13, wherein:

the storing further comprises receiving, from a switching unit, statistical information associated with the IGMP message, and

the value is stored in the ONU MAC register based on whether the traffic forwarding to the subscriber is needed and a combination of the statistical information.

17. A method of filtering GPON Encapsulation Mode (GEM) frames, the method comprising:

checking a header of a packet to extract a port identifier and verifying whether to discard or forward a packet based on a combination of the extracted port identifier stored in the header, and

when traffic forwarding is required, then storing a value in an Optical Network Unit (ONU) Media Access Control (MAC) register wherein a filtering register uses the value to determine whether to discard FPON Encapsulation Mode (GEM) frame by filtering or to forward the GEM frame.

18. The method of claim 17, wherein the determining comprises:

verifying whether the extracted port identifier corresponds to the subscriber terminal; and

either discarding the packet based on the value of the filtering register regardless of whether the subscriber corresponds to the extracted port identifier, or verifying whether the subscriber terminal corresponds to the port identifier to thereby determine whether to discard or forward the packet.

19. The method of claim 17, wherein the determining comprises determining whether to discard or forward the packet based on the value of the filtering register, when the port identifier corresponds to the multicast port identifier.