Apparatus and methods for reduction of transmission delay in a communication network

• US 8,345,553 B2
• Filed: 03/03/2008
• Issued: 01/01/2013
• Est. Priority Date: 05/31/2007
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Ohana, Yitshak, Klein, Philippe, Kliger, Avi, Palm, Stephen
• Primary Examiner(s): Lai, Andrew
• Assistant Examiner(s): LOO, JUVENA W
• Application Number:
  US12/041,368
• Publication Number:
  US 20080298241A1
• Time in Patent Office: 1,765 Days
• Field of Search: 370229-235, 370431-468, 714/18, 714/748, 714/708
• US Class Current: 370/235
• CPC Class Codes: H04L 12/2801 Broadband local area networks
• CPC Class Codes: H04L 49/206 Real Time traffic
• CPC Class Codes: H04L 49/351 for local area network [LAN], e.g. Ethernet switches

Abstract

Apparatus and methods for reducing latency in coordinated networks. The apparatus and methods relate to a protocol that may be referred to as the Persistent Reservation Request (“p-RR”), which may be viewed as a type of RR (reservation request). p-RR'"'"'s may reduce latency, on average, to one MAP cycle or less. A p-RR may be used to facilitate Ethernet audiovisual bridging. Apparatus and methods of the invention may be used in connection with coaxial cable based networks that serve as a backbone for a managed network, which may interface with a package switched network.

Claims

1. A method for managing transmission of data over a shared media communication network, the method comprising:

receiving from a node a reservation request, the node being in communication with the network and the reservation request requesting allocation of network resources for transmitting the data; and

sending to the node a first grant of bandwidth for a latency-reducing data flow based on the reservation request during a first MoCA MAP cycle granting bandwidth for transmission of data during a second MoCA MAP cycle;

sending to the node a second grant of bandwidth based on the reservation request during the first MoCA MAP cycle granting bandwidth for transmission of data during a third MoCA MAP cycle before receiving a second reservation request from the node;

wherein the node transmits at least one data frame before a second grant of bandwidth based on the reservation request is received by the node;

wherein the data frames are defined by a Multimedia over Coax Alliance (“

MoCA”

) specification.

2. The method of claim 1 wherein the flow has a duration that is greater than the duration of one medium access plan cycle.

3. The method of claim 1 wherein the reservation request comprises a traffic specification.

4. The method of claim 3 further comprising canceling the flow based on information included in the traffic specification.

5. The method of claim 1 further comprising canceling the flow based on the execution of a link maintenance operation process.

6. The method of claim 1 wherein the managing comprises allocating network resources during a portion of at least one medium access plan cycle, the portion having a duration that is less than the duration of the medium access plan cycle.

10. The method of claim 1 wherein at least a second data frame is transmitted by the node before the second grant of bandwidth is received by the node.

11. The method of claim 10 wherein at least the second data frame is transmitted within in one MAP cycle.

7. A device for managing transmission of data over a shared media communication network, the device comprising:

a receiver module in communication with the network, the receiver module configured to receive a reservation request from a node in communication with the network;

a processor module in communication with the receiver module, the processor module configured to establish a latency-reducing data flow based on the request; and

a transmitter module configured to inform the node of a first grant based on the request during a first MoCA MAP cycle, the first grant granting bandwidth for transmission of data during a second MoCA MAP cycle and to inform the node of a second grant of bandwidth based on the reservation request during the first MoCA MAP cycle, the second grant granting bandwidth for transmission of data during a third MoCA MAP cycle prior to receiving a second reservation request from the node, the first grant authorizing the node to transmit at least one data frame before the node receives the second grant based on the request;

wherein the data frames are defined by a Multimedia over Coax Alliance (“

MoCA”

) specification.

8. A method for transmitting multicast information from a first node to a second node, the first node residing in a packet mode network and the second node residing in a packet-switched network, the method comprising:

receiving at the first node a registration request from the second node, the registration request requesting receipt of the multicast information, the registration request including a traffic specification; and

transmitting, using the first node, a reservation request to a network coordinator residing in the packet mode network, the reservation request conforming to the traffic specification;

the first node receiving a first grant of bandwidth based on the reservation request during a first MoCA MAP cycle granting bandwidth for transmission of data during a second MoCA MAP cycle and a second grant of bandwidth based on the reservation request before receiving a second reservation request from the node;

wherein;

the first node transmits at least one frame(s) of multicast data before receiving a second grant of bandwidth based on the reservation request during the first MoCA MAP cycle granting bandwidth for transmission of data during a third MoCA MAP cycle; and

the data frames are defined by a Multimedia over Coax Alliance (“

MoCA”

) specification.

9. The method of claim 8 further comprising, when the network coordinator generates medium access plan cycles and the reservation request corresponds to one of the cycles, each of the first and second grants of bandwidth being transmitted in a subsequent cycle.

12. A method for managing transmission of data over a shared media communication network, the method comprising:

receiving from a node a reservation request, the node being in communication with the network and the reservation request requesting allocation of network resources for transmitting the data; and

sending to the node a first grant of bandwidth for a latency-reducing data flow based on the reservation request during a first MoCA MAP cycle granting bandwidth for transmission of data during a second MoCA MAP cycle;

transmitting from the node at least one data frame based on the first grant of bandwidth;

before receiving a second reservation request from the node, sending a second grant of bandwidth to the node based on the reservation request during the first MoCA MAP cycle granting bandwidth for transmission of data during a third MoCA MAP cycle;

wherein the data frames are defined by a Multimedia over Coax Alliance (“

MoCA”

) specification.

13. The method of claim 12 wherein at least a second data frame is transmitted by the node before the second grant of bandwidth is received by the node.

14. The method of claim 13 wherein at least the second data frame is transmitted within one MAP cycle.