CA2272978A1 - Novel method and apparatus for traffic shaping in a broadband fiber-based access system - Google Patents

Novel method and apparatus for traffic shaping in a broadband fiber-based access system Download PDF

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Publication number
CA2272978A1
CA2272978A1 CA002272978A CA2272978A CA2272978A1 CA 2272978 A1 CA2272978 A1 CA 2272978A1 CA 002272978 A CA002272978 A CA 002272978A CA 2272978 A CA2272978 A CA 2272978A CA 2272978 A1 CA2272978 A1 CA 2272978A1
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priority
cells
traffic cells
traffic
stream
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CA2272978C (en
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Alan Frank Graves
Andrew Jocelyn Timms
David Anthony Fisher
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Rockstar Consortium US LP
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Nortel Networks Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/30—Peripheral units, e.g. input or output ports
    • H04L49/3081—ATM peripheral units, e.g. policing, insertion or extraction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/20—Support for services
    • H04L49/205—Quality of Service based
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/25—Routing or path finding in a switch fabric
    • H04L49/253—Routing or path finding in a switch fabric using establishment or release of connections between ports
    • H04L49/254—Centralised controller, i.e. arbitration or scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/25—Routing or path finding in a switch fabric
    • H04L49/253—Routing or path finding in a switch fabric using establishment or release of connections between ports
    • H04L49/255—Control mechanisms for ATM switching fabrics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/50—Overload detection or protection within a single switching element
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5603—Access techniques
    • H04L2012/5604—Medium of transmission, e.g. fibre, cable, radio
    • H04L2012/5605—Fibre
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5603—Access techniques
    • H04L2012/5609—Topology
    • H04L2012/561—Star, e.g. cross-connect, concentrator, subscriber group equipment, remote electronics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5678—Traffic aspects, e.g. arbitration, load balancing, smoothing, buffer management
    • H04L2012/568—Load balancing, smoothing or shaping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/20—Support for services
    • H04L49/201—Multicast operation; Broadcast operation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/30—Peripheral units, e.g. input or output ports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0071—Provisions for the electrical-optical layer interface

Abstract

A novel method and apparatus for controlling the flow of traffic between a host digital terminal (HDT) and a plurality of optical network units (ONU s). Each ONU is connected to the HDT by optical fiber and to a plurality of subscribers by a respective plurality of subscriber drops. The bandwidth on the fiber, although large, is usually inferior to the total bandwidth that can be transmitted across the subscriber drops. Therefore, both upstream and downstream traffic may become congested at various "choke points" under certain circumstances of usage. The present invention provides a traffic shaper located in the HDT, which gives centralized control of the traffic flowing to and from the ONU s. Consideration of the priority and destination of each traffic cell is taken into account by the traffic shaper to ensure that the capacity of the fiber and of the individual drops is never exceeded, irrespective of the transaction sizes, thereby eliminating the need for costly buffers in the outside plant. Any maintenance or repairs of the traffic shaper can be easily effected without field visits, due to its centralized location.

Claims (38)

1. A method of downstream data transmission for use in an access system comprising a host digital terminal (HDT) connected by optical fiber to a plurality of optical network units (ONU s), each ONU being connected to a respective plurality of subscribers by a respective plurality of subscriber drops, the method comprising:
determining which drops from among the subscriber drops the downstream data is destined for, said drops being destination drops;
determining the downstream bandwidth available on the fiber and on the destination drops; and transmitting the downstream data only if there is sufficient downstream bandwidth on the fiber and on the destination drops.
2. A method of transmitting upstream data, for use in an access system comprising a host digital terminal (HDT) connected by optical fiber to a plurality of optical network units (ONU s), each ONU being connected to a respective plurality of subscribers by a respective plurality of subscriber drops, the method comprising:
determining which drops from among the subscriber drops intend to transmit upstream data, said drops being source drops;
determining the upstream bandwidth available on the fiber and on the source drops; and allowing the transmittal of upstream data only if there is sufficient upstream bandwidth on the fiber and on the source drops.
3. A method of transmitting data from a host digital terminal (HDT) to at least one optical network unit (ONU), each ONU being connected to the HDT by optical fiber and to a respective plurality of subscribers by a respective plurality of subscriber drops, wherein the data can be transmitted across the fiber at a maximum fiber data rate and across each drop at a respective maximum drop data rate, wherein the data is requested to be transmitted across the fiber at a requested fiber data rate and across each drop at a respective requested drop data rate, the data being a mixture of high-priority data and low-priority data, the method comprising the steps of:
the HDT determining which of said downstream data is high-priority data and which of said downstream data is low-priority data;
if the requested fiber data rate is less than or equal to the maximum fiber data rate and if the requested drop data rate is less than or equal to the maximum drop data rate, the HDT transmitting all of said downstream data;
otherwise, the HDT transmitting all of said high-priority data and only part of said low-priority data, and temporarily storing the remaining low-priority data.
4. A method of mapping an input sequence of traffic cells to an output sequence of traffic cells for transmission by a host digital terminal (HDT) to at least one optical network unit (ONU), each ONU being connected by optical fiber to the HDT and by a respective plurality of subscriber drops to a respective plurality of subscribers, each traffic cell being associated with either high-priority or low-priority traffic and with a destination drop from among the subscriber maximum fiber data rate, wherein data can be transmitted across each subscriber drop at a respective maximum drop data rate, the method comprising the steps of:
determining the traffic priority and destination drop associated with each cell in the input sequence;
separating the cells in the input sequence according to the traffic priority and destination drop associated with each cell, thereby to produce a plurality of demultiplexed cell streams;
temporarily storing the plurality of demultiplexed cell streams in a respective plurality of buffers and releasing the cells in each buffer according to respective controllable output data rates; and combining the cells released by the plurality of buffers, thereby to form the output sequence;
wherein the total output data rate of all buffers containing high-priority traffic cells is controlled to be less than or equal to the maximum fiber data rate;
wherein the total output data rate of all buffers containing high-priority traffic cells associated with a common destination drop is controlled to be less than or equal to the maximum drop data rate for that destination drop;
wherein the total output data rate of all buffers containing low-priority traffic cells is controlled to be less than or equal to the maximum fiber data rate minus the total output data rate of all buffers containing high-priority traffic cells; and wherein the total output data rate of all buffers containing low-priority traffic cells associated with a common destination drop is controlled to be less than or equal to the maximum drop data rate for that destination drop minus the total output data rate of all buffers containing high-priority traffic cells associated with that destination drop.
5. A method according to claim 4, wherein the traffic cells are asynchronous transfer mode (ATM) cells each having a header, wherein the traffic priority associated with a traffic cell is encoded in the header of said cell, wherein the destination drop associated with a high-priority or low-priority traffic cell is encoded in the header of said high-priority or low-priority traffic cell.
6. A method according to claim 4, wherein the total output data rate of all buffers containing low-priority traffic cells associated with a common destination drop is distributed substantially equally among said buffers.
7. A method of mapping an input sequence of traffic cells to an output sequence of traffic cells for transmission by a host digital terminal (HDT) to at least one optical network unit (ONU), each ONU being connected by optical fiber to the HDT and by a respective plurality of subscriber drops to a respective plurality of subscribers, each traffic cell being associated with either broadcast-priority, high-priority or low-priority traffic, each high-priority or low-priority traffic cell being associated with a destination drop from among the subscriber drops, each broadcast-priority cell being further associated with a broadcast channel, wherein each subscriber drop is associated with a controllable number of broadcast channels, wherein data can be transmitted across the fiber at a maximum fiber data rate, wherein data can be transmitted across each subscriber drop at a respective maximum drop data rate, the method comprising the steps of:
determining the traffic priority and destination drop or broadcast channel associated with each cell in the input sequence;
separating the cells in the input sequence according to the traffic priority and destination drop or broadcast channel associated with each cell, thereby to produce a plurality of demultiplexed cell streams;
temporarily storing the plurality of demultiplexed cell streams in a respective plurality of buffers and releasing the cells in each buffer according to respective controllable output data rates; and combining the cells released by the plurality of buffers, thereby to form the output sequence;
wherein the total output data rate of all buffers containing broadcast-priority traffic cells is controlled to be less than or equal to the maximum fiber data rate;
wherein the number of broadcast channels associated with each subscriber drop is controlled such that the total output data rate of all buffers containing broadcast-priority traffic cells associated with the broadcast channels associated with said subscriber drop is less than or equal to the maximum drop data rate;
wherein the total output data rate of all buffers containing high-priority traffic cells is less than or equal to the maximum fiber data rate minus the total output data rate of all buffers containing broadcast-priority traffic;
wherein the total output data rate of all buffers containing high-priority traffic cells associated with a common destination drop is less than or equal to the maximum drop data rate for that destination drop minus the total output data rate of all buffers containing broadcast-priority traffic cells associated with the broadcast channels associated with that destination drop;
wherein the total output data rate of all buffers containing low-priority traffic cells is less than or equal to the maximum fiber data rate minus the sum of the total output data rate of all buffers containing high-priority traffic cells and the total output data rate of all buffers containing broadcast-priority traffic cells; and wherein the total output data rate of all buffers containing low-priority traffic cells associated with a common destination drop is less than or equal to the maximum drop data rate for that destination drop minus the sum of the total output data rate of all buffers containing high-priority traffic cells associated with that destination drop and the total output data rate of all buffers containing broadcast-priority traffic cells associated with the broadcast channels associated with that destination drop.
8. A method according to claim 7, wherein the traffic cells are asynchronous transfer mode (ATM) cells each having a header, wherein the traffic priority associated with a traffic cell is encoded in the header of said cell, wherein the destination drop associated with a high-priority or low-priority traffic cell is encoded in the header of said high-priority or low-priority traffic cell, wherein the broadcast channel associated with a broadcast-priority traffic cell is encoded in the header of said broadcast-priority traffic cell.
9. A method according to claim 7, wherein the total output data rate of all buffers containing low-priority traffic cells associated with a common destination drop is distributed substantially equally among said buffers.
10. In an access system comprising a host digital terminal (HDT) connected by optical fiber to a plurality of optical network units (ONU s), each ONU being connected to a respective plurality of subscribers by a respective plurality of subscriber drops, a traffic shaper for transmitting an output stream of traffic cells from the HDT to the subscribers, the traffic shaper comprising:
control means for determining the bandwidth available on the fiber and on the subscriber drops; and remapping means for controllably reordering and releasing an input stream of traffic cells in accordance with the bandwidth available on the fiber and on the subscriber drops, thereby to form the output stream of traffic cells.
11. A traffic shaper according to claim 10, wherein the control means is a control processor, and wherein the remapping means comprises a random access memory (RAM) for temporarily storing the traffic cells in the input stream and retrieving the traffic cells in an order and at a rate controlled by the control processor.
12. A traffic shaper according to claim 10 or 11, wherein the traffic cells are asynchronous transfer mode (ATM) cells.
13. A traffic shaper according to claim 10, wherein each traffic cell is associated with either high-priority or low-priority traffic, wherein the control means is a control processor, and wherein the remapping means comprises:
means for separating traffic cells in the input stream of traffic cells according to traffic priority, thereby to produce a stream of high-priority traffic cells and a stream of low-priority traffic cells;
means for controllably reordering and releasing the traffic cells in the stream of high-priority traffic cells, thereby to produce an ordered stream of high-priority traffic cells;
means for controllably reordering and releasing the traffic cells in the stream of low-priority traffic cells, thereby to produce an ordered stream of low-priority traffic cells; and means for combining the ordered stream of high-priority traffic cells and the ordered stream of low-priority traffic cells, thereby to produce the output stream of traffic cells.
14. A traffic shaper according to claim 13, wherein the traffic cells are asynchronous transfer mode (ATM) cells each having a header, wherein the traffic priority associated with a traffic cell is encoded in the header of said cell.
15. A traffic shaper according to claim 10, wherein each traffic cell is associated with either high-priority or low-priority traffic and with a destination drop from among the subscriber drops, wherein the control means is a control processor, and wherein the remapping means comprises:

means for separating traffic cells in the input stream of traffic cells according to traffic priority, thereby to produce a stream of high-priority traffic cells and a stream of low-priority traffic cells;
means for separating the traffic cells in the stream of high-priority traffic cells according to destination drop, thereby to produce a plurality of drop-specific streams of high-priority traffic cells;
a first plurality of buffers for temporarily storing and controllably releasing the plurality of drop-specific streams of high-priority traffic cells, thereby to produce a respective plurality of paced drop-specific streams of high-priority traffic cells;
means for combining the paced drop-specific streams of high-priority traffic cells, thereby to produce an ordered stream of high-priority traffic cells;
means for separating the traffic cells in the stream of low-priority traffic cells according to destination drop, thereby to produce a plurality of drop-specific streams of low-priority traffic cells;
a second plurality of buffers for temporarily storing and controllably releasing the plurality of drop-specific streams of low-priority traffic cells, thereby to produce a respective plurality of paced drop-specific streams of low-priority traffic cells;
means for combining the paced drop-specific streams of low-priority traffic cells, thereby to produce an ordered stream of low-priority traffic cells;
means for combining the ordered stream of high-priority traffic cells with the ordered stream of low-priority traffic cells, thereby to produce the output stream of traffic cells.
16. A traffic shaper according to claim 15, wherein the traffic cells are asynchronous transfer mode (ATM) cells each having a header, wherein the traffic priority associated with a traffic cell is encoded in the header of said cell, wherein the destination drop associated with a high-priority or low-priority traffic cell is encoded in the header of said high-priority or low-priority traffic cell.
17. A traffic shaper according to claim 15, wherein the total output data rate of all buffers containing low-priority traffic cells associated with a common destination drop is distributed substantially equally among said buffers.
18. A traffic shaper according to claim 10, wherein each traffic cell is associated with one of broadcast-priority, high-priority or low-priority traffic, wherein the control means is a control processor, and wherein the remapping means comprises:
means for separating traffic cells in the input stream of traffic cells according to priority, thereby to produce a stream of broadcast-priority traffic cells, a stream of high-priority traffic cells and a stream of low-priority traffic cells;
means for controllably reordering and releasing the traffic cells in the stream of broadcast-priority traffic cells, thereby to produce an ordered stram of broadcast-priority traffic cells;

means for controllably reordering and releasing the traffic cells in the stream of high-priority traffic cells, thereby to produce an ordered stream of high-priority traffic cells;
means for controllably reordering and releasing the traffic cells in the stream of low-priority traffic cells, thereby to produce an ordered stream of low-priority traffic cells; and means for combining the ordered stream of broadcast-priority traffic cells, the ordered stream of high-priority traffic cells and the ordered stream of low-priority traffic cells, thereby to produce the output stream of traffic cells.
19. A traffic shaper according to claim 18, wherein the traffic cells are asynchronous transfer mode (ATM) cells each having a header, wherein the traffic priority associated with a traffic cell is encoded in the header of said cell.
20. A traffic shaper according to claim 10, wherein each traffic cell is associated with one of broadcast-priority, high-priority or low-priority traffic, wherein each high-priority or low-priority traffic cell is further associated with a destination drop from among the subscriber drops, wherein each broadcast-priority cell is further associated with a broadcast channel, wherein each subscriber drop is associated with a controllable number of broadcast channels, wherein the control means controls the broadcast channels associated with each subscriber drop, wherein the control means is a control processor, and wherein the remapping means comprises:

means for separating traffic cells in the input stream of traffic cells according to priority, thereby to produce a stream of broadcast-priority traffic cells, a stream of high-priority traffic cells and a stream of low-priority traffic cells;
means for separating the traffic cells in the stream of broadcast-priority traffic cells according to broadcast channel, thereby to produce a plurality of channel-specific streams of broadcast-priority traffic cells;
a first plurality of buffers for temporarily storing and controllably releasing the plurality of channel-specific streams of broadcast-priority traffic cells, thereby to produce a respective plurality of paced channel-specific streams of broadcast-priority traffic cells;
means for combining the paced channel-specific streams of broadcast-priority traffic cells, thereby to produce an ordered stream of broadcast-priority traffic cells;
means for separating the traffic cells in the stream of high-priority traffic cells according to destination drop, thereby to produce a plurality of drop-specific streams of high-priority traffic cells;
a second plurality of buffers for temporarily storing and controllably releasing the plurality of drop-specific streams of high-priority traffic cells, thereby to produce a respective plurality of paced drop-specific streams of high-priority traffic cells;
means for combining the paced drop-specific streams of high-priority traffic cells, thereby to produce an ordered stream of high-priority traffic cells;
means for separating the traffic cells in the stream of low-priority traffic cells according to destination drop, thereby to produce a plurality of drop-specific streams of low-priority traffic cells;
a third plurality of buffers for temporarily storing and controllably releasing the plurality of drop-specific streams of low-priority traffic cells, thereby to produce a respective plurality of paced drop-specific streams of low-priority traffic cells;
means for combining the paced drop-specific streams of low-priority traffic cells, thereby to produce an ordered stream of low-priority traffic cells; and means for combining the ordered stream of broadcast-priority traffic cells, the ordered stream of high-priority traffic cells and the ordered stream of low-priority traffic cells, thereby to produce the output stream of traffic cells.
21. A traffic shaper according to claim 20, wherein the traffic cells are asynchronous transfer mode (ATM) cells each having a header, wherein the traffic priority associated with a traffic cell is encoded in the header of said cell, wherein the destination drop associated with a high-priority or low-priority traffic cell is encoded in the header of said high-priority or low-priority traffic cell, wherein the broadcast channel associated with a broadcast-priority traffic cell is encoded in the header of said broadcast-priority traffic cell.
22. A traffic shaper according to claim 20, wherein the total output data rate of all buffers containing low-priority traffic cells associated with a common destination drop is distributed substantially equally among said buffers.
23. A traffic shaper according to claim 10, wherein each traffic cell is associated with one of broadcast-priority, high-priority or low-priority traffic, wherein each low-priority traffic cell is further associated with a destination drop from among the subscriber drops and with a service being delivered to that destination drop, wherein multiple services can be associated with an identical destination drop, wherein each high-priority traffic cell is further associated with a destination drop from among the subscriber drops, wherein each broadcast-priority cell is further associated with a broadcast channel, wherein each subscriber drop is associated with a controllable number of broadcast channels, wherein the control means controls the broadcast channels associated with each subscriber drop, wherein the control means is a control processor, and wherein the remapping means comprises:
means for separating traffic cells in the input stream of traffic cells according to priority, thereby to produce a stream of broadcast-priority traffic cells, a stream of high-priority traffic cells and a stream of low-priority traffic cells;
means for separating the traffic cells in the stream of broadcast-priority traffic cells according to broadcast channel, thereby to produce a plurality of channel-specific streams of broadcast-priority traffic cells;
a first plurality of buffers for temporarily storing and controllably releasing the plurality of channel-specific streams of broadcast-priority traffic cells, thereby to produce a respective plurality of paced channel-specific streams of broadcast-priority traffic cells;

means for combining the paced channel-specific streams of broadcast-priority traffic cells, thereby to produce an ordered stream of broadcast-priority traffic cells;
means for separating the traffic cells in the stream of high-priority traffic cells according to destination drop, thereby to produce a plurality of drop-specific streams of high-priority traffic cells;
a second plurality of buffers for temporarily storing and controllably releasing the plurality of drop-specific streams of high-priority traffic cells, thereby to produce a respective plurality of paced drop-specific streams of high-priority traffic cells;
means for combining the paced drop-specific streams of high-priority traffic cells, thereby to produce an ordered stream of high-priority traffic cells;
means for separating the traffic cells in the stream of low-priority traffic cells according to service and destination drop, thereby to produce a plurality of individual streams of low-priority traffic cells;
a third plurality of buffers for temporarily storing and making available the plurality of individual streams of low-priority traffic cells, thereby to produce a respective plurality of delayed service-specific streams of low-priority traffic cells;
means for combining the delayed individual streams of low-priority traffic cells according to destination drop, thereby to produce a plurality of drop-specific streams of low-priority traffic cells;
means for temporarily storing and controllably releasing the plurality of drop-specific streams of low-priority traffic cells, thereby to produce a plurality of paced drop-specific streams of low-priority traffic cells;
means for combining the paced drop-specific streams of low-priority traffic cells, thereby to produce an ordered stream of low-priority traffic cells;
means for temporarily storing and controllably releasing the ordered streams of low-priority traffic cells, thereby to produce a paced and ordered stream of low-priority traffic cells;
means for combining the ordered stream of broadcast-priority traffic cells, the ordered stream of high-priority traffic cells and the paced and ordered stream of low-priority traffic cells, thereby to produce the output stream of traffic cells.
24. A host digital terminal, comprising:
a first plurality of optoelectronic converters for exchanging upstream and downstream traffic cells with a core network via optical fiber;
a digital switch matrix connected to the first plurality of optoelectronic converters, for routing the upstream and downstream traffic cells to and from the core network in accordance with a controllable routing map;
an HDT control processor connected to the digital switch matrix for controlling the routing map of the digital switch matrix;
a plurality of base stations for formatting the downstream traffic cells into downstream subframes comprising a control channel containing control information and a traffic channel containing the downstream traffic cells, and for formatting upstream subframes received from the ONUs into upstream traffic cells;
a second plurality of optoelectronic converters for exchanging subframes with the ONUs; and a traffic shaper connected between the digital switch matrix and the second plurality of optoelectronic converters, for controlling the transmission of downstream traffic cells, the traffic shaper comprising control means for determining the bandwidth available on the fiber and on the subscriber drops, and remapping means for controllably reordering and releasing an input stream of downstream traffic cells received from the digital switch matrix in accordance with the bandwidth available on the fiber and on the subscriber drops, thereby to form an output stream of downstream traffic cells delivered to a corresponding one of the second plurality of base stations.
25. An HDT according to claim 24, wherein the control means is a traffic shaping control processor, and wherein the remapping means comprises a random access memory (RAM) for temporarily storing the traffic cells in the input stream and retrieving the traffic cells in an order and at a rate controlled by the traffic shaping control processor.
26. An HDT according to claim 24, wherein each traffic cell is associated with either high-priority or low-priority traffic, wherein the control means is a traffic shaping control processor, and wherein the remapping means comprises:
means for separating traffic cells in the input stream according to traffic priority, thereby to produce a stream of high-priority traffic cells and a stream of low-priority traffic cells;
means for controllably reordering and releasing the traffic cells in the stream of high-priority traffic cells, thereby to produce an ordered stream of high-priority traffic cells;
means for controllably reordering and releasing the traffic cells in the stream of low-priority traffic cells, thereby to produce an ordered stream of low-priority traffic cells; and means for combining the ordered stream of high-priority traffic cells and the ordered stream of low-priority traffic cells, thereby to produce the output stream.
27. An HDT according to claim 24, wherein each traffic cell is associated with either high-priority or low-priority traffic and with a destination drop from among the subscriber drops, wherein the control means is a traffic shaping control processor, and wherein the remapping means comprises:
means for separating traffic cells in the input stream according to traffic priority, thereby to produce a stream of high-priority traffic cells and a stream of low-priority traffic cells;
means for separating the traffic cells in the stream of high-priority traffic cells according to destination drop, thereby to produce a plurality of drop-specific streams of high-priority traffic cells;
a first plurality of buffers for temporarily storing and controllably releasing the plurality of drop-specific streams of high-priority traffic cells, thereby to produce a respective plurality of paced drop-specific streams of high-priority traffic cells;
means for combining the paced drop-specific streams of high-priority traffic cells, thereby to produce an ordered stream of high-priority traffic cells;
means for separating the traffic cells in the stream of low-priority traffic cells according to destination drop, thereby to produce a plurality of drop-specific streams of low-priority traffic cells;
a second plurality of buffers for temporarily storing and controllably releasing the plurality of drop-specific streams of low-priority traffic cells, thereby to produce a respective plurality of paced drop-specific streams of low-priority traffic cells;
means for combining the paced drop-specific streams of low-priority traffic cells, thereby to produce an ordered stream of low-priority traffic cells;
means for combining the ordered stream of high-priority traffic cells with the ordered stream of low-priority traffic cells, thereby to produce the output stream.
28. An HDT according to claim 24, wherein each traffic cell is associated with one of broadcast-priority, high-priority or low-priority traffic, wherein the control means is a traffic shaping control processor, and wherein the remapping means comprises:
means for separating traffic cells in the input stream according to priority, thereby to produce a stream of broadcast-priority traffic cells, a stream of high-priority traffic cells and a stream of low-priority traffic cells;

means for controllably reordering and releasing the traffic cells in the stream of broadcast-priority traffic cells, thereby to produce an ordered stream of broadcast-priority traffic cells;
means for controllably reordering and releasing the traffic cells in the stream of high-priority traffic cells, thereby to produce an ordered stream of high-priority traffic cells;
means for controllably reordering and releasing the traffic cells in the stream of low-priority traffic cells, thereby to produce an ordered stream of low-priority traffic cells; and means for combining the ordered stream of broadcast-priority traffic cells, the ordered stream of high-priority traffic cells and the ordered stream of low-priority traffic cells, thereby to produce the output stream.
29. An HDT according to claim 24, wherein each traffic cell is associated with one of broadcast-priority, high-priority or low-priority traffic, wherein each high-priority or low-priority traffic cell is further associated with a destination drop from among the subscriber drops, wherein each broadcast-priority cell is further associated with a broadcast channel, wherein each subscriber drop is associated with a controllable number of broadcast channels, wherein the control means controls the broadcast channels associated with each subscriber drop, wherein the control means is a traffic shaping control processor, and wherein the remapping means comprises:
means for separating traffic cells in the input stream according to priority, thereby to produce a stream of broadcast-priority traffic cells, a stream of high-priority traffic cells and a stream of low-priority traffic cells;
means for separating the traffic cells in the stream of broadcast-priority traffic cells according to broadcast channel, thereby to produce a plurality of channel-specific streams of broadcast-priority traffic cells;
a first plurality of buffers for temporarily storing and controllably releasing the plurality of channel-specific streams of broadcast-priority traffic cells, thereby to produce a respective plurality of paced channel-specific streams of broadcast-priority traffic cells;
means for combining the paced channel-specific streams of broadcast-priority traffic cells, thereby to produce an ordered stream of broadcast-priority traffic cells;
means for separating the traffic cells in the stream of high-priority traffic cells according to destination drop, thereby to produce a plurality of drop-specific streams of high-priority traffic cells;
a second plurality of buffers for temporarily storing and controllably releasing the plurality of drop-specific streams of high-priority traffic cells, thereby to produce a respective plurality of paced drop-specific streams of high-priority traffic cells;
means for combining the paced drop-specific streams of high-priority traffic cells, thereby to produce an ordered stream of high-priority traffic cells;
means for separating the traffic cells in the stream of low-priority traffic cells according to destination drop, thereby to produce a plurality of drop-specific streams of low-priority traffic cells;

a third plurality of buffers for temporarily storing and controllably releasing the plurality of drop-specific streams of low-priority traffic cells, thereby to produce a respective plurality of paced drop-specific streams of low-priority traffic cells;
means for combining the paced drop-specific streams of low-priority traffic cells, thereby to produce an ordered stream of low-priority traffic cells; and means for combining the ordered stream of broadcast-priority traffic cells, the ordered stream of high-priority traffic cells and the ordered stream of low-priority traffic cells, thereby to produce the output stream.
30. An HDT according to claim 25, wherein the HDT
control processor and traffic shaping control processor are identical.
31. An HDT according to claim 26, wherein the HDT
control processor and traffic shaping control processor are identical.
32. An HDT according to claim 27, wherein the HDT
control processor and traffic shaping control processor are identical.
33. An HDT according to claim 28, wherein the HDT
control processor and traffic shaping control processor are identical.
34. An HDT according to claim 29, wherein the HDT
control processor and traffic shaping control processor are identical.
35. An access system comprising:
a host digital terminal (HDT) for connection to a core network; and a plurality of optical network units (ONUs) connected by optical fiber to the HDT, each ONU being connectable to a respective plurality of subscribers by a respective plurality of subscriber drops;
wherein the HDT comprises a traffic shaper for transmitting an output data stream from the HDT to the subscribers, the traffic shaper comprising control means for determining the bandwidth available on the fiber and on the subscriber drops; and remapping means for controllably reordering and releasing an input stream of traffic cells in accordance with the bandwidth available on the fiber and on the subscriber drops, thereby to form the output data stream.
36. An access system, comprising:
a plurality of optical network units (ONUs), each ONU being connectable to a respective plurality of subscribers by a respective plurality of subscriber drops; and a host digital terminal (HDT) connected by optical fiber to the ONUs and being connectable to a core network, for relaying downstream data from the core network to the ONUs and for relaying upstream data from the ONUs to the core network;
wherein the HDT comprises a first plurality of optoelectronic converters for exchanging upstream and downstream traffic cells with a core network via optical fiber; a digital switch matrix connected to the first plurality of optoelectronic converters, for routing the upstream and downstream traffic cells to and from the core network in accordance with a controllable routing map; an HDT
control processor connected to the digital switch matrix for controlling the routing map of the digital switch matrix; a plurality of base stations for formatting the downstream traffic cells into downstream subframes comprising a control channel containing control information and a traffic channel containing the downstream traffic cells, and for formatting upstream subframes received from the ONUs into upstream traffic cells; a second plurality of optoelectronic converters for exchanging subframes with the ONUs; and a traffic shaper connected between the digital switch matrix and the second plurality of optoelectronic converters, for controlling the transmission of downstream traffic cells, the traffic shaper comprising control means for determining the bandwidth available on the fiber and on the subscriber drops, and remapping means for controllably reordering and releasing an input stream of downstream traffic cells received from the digital switch matrix in accordance with the bandwidth available on the fiber and on the subscriber drops, thereby to form an output stream of downstream traffic cells delivered to a corresponding one of the second plurality of base stations;
and wherein each ONU comprises an optoelectronic converter connected to the optical fiber joining that ONU to the HDT; an out station connected to the optoelectronic converter for formatting the downstream subframes arriving from the HDT into a stream of intermittent downstream traffic cells and for formatting a stream of upstream traffic cells arriving from the corresponding subscriber drops into upstream subframes; a demultiplexer connected to the out station means for determining which drop among the subscriber drops connected to that ONU each downstream traffic cell is destined for; a plurality of line cards connected to the demultiplexer, each line card comprising a downstream buffer for temporarily storing the downstream traffic cells arriving from the HDT, interface means for interfacing to the associated subscriber drop, an upstream buffer for storing the upstream traffic cells arriving from the subscriber drop; a multiplexer connected to the line cards, for combining the traffic cells arriving on each of the line cards into the stream of upstream traffic cells; and a anti-fitter buffer having a corresponding length connected between the multiplexer and the out station for temporarily storing the stream of upstream traffic cells prior tp transmission by the ONU.
37. An access system according to claim 36, wherein the ONU further comprises an ONU control processor connected to the out station and to the demultiplexer; wherein the demultiplexer in the ONU has a mapping that is modifiable by the ONU control processor; wherein the instant of transmission of upstream subframes by the ONU is controllable by the ONU
control processor; wherein the ONU control processor is controllable by control information present in the control channel of downstream subframes received from the HDT.
38. An access system according to claim 36 or 37, wherein each line card comprises a queue control block connected to its upstream buffer and connected to the ONU
control processor in the associated ONU, for notifying the ONU

control processor as to the level to which its upstream buffer is full.
CA002272978A 1998-05-27 1999-05-20 Novel method and apparatus for traffic shaping in a broadband fiber-based access system Expired - Lifetime CA2272978C (en)

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