Support for quality of service and vertical services in digital subscriber line domain

• US 6,904,054 B1
• Filed: 08/10/2000
• Issued: 06/07/2005
• Est. Priority Date: 08/10/2000
• Status: Expired due to Term

• Current Assignee: Rakuten, Inc. (Rakuten Group, Inc.)
• Original Assignee: Verizon Communications Inc.
• Inventors: Voit, Eric A., Baum, Robert T.
• Primary Examiner(s): Hsu, Alpus H.
• Assistant Examiner(s): NGUYEN, TOAN D
• Application Number:
  US09/635,695
• Time in Patent Office: 1,762 Days
• Field of Search: 370/394, 370/395, 370/397, 370/399, 370/401, 370/409, 370/412, 370/465, 370/466, 370/467, 370/470, 370/474
• US Class Current: 370/467
• CPC Class Codes: H04L 2012/561 Star, e.g. cross-connect, concentrator, subscriber group equipment, remote electronics
• CPC Class Codes: H04L 2012/5632 Bandwidth allocation
• CPC Class Codes: H04L 2012/5658 using the AAL5
• CPC Class Codes: H04L 2012/5667 IP over ATM
• CPC Class Codes: H04L 2012/5672 Multiplexing, e.g. coding, scrambling
• CPC Class Codes: H04L 47/2408 for supporting different services, e.g. a differentiated services [DiffServ] type of service
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

Offering vertical services to subscribers and service providers is an avenue to immediately improve the competitiveness of digital subscriber line access service, for example of the type offered by a local exchange carrier. To deliver high-quality vertical services, however, the underlying ADSL Data Network (ADN) or the like needs to establish Quality of Service (QoS) as a core characteristic and offer an efficient mechanism for insertion of the vertical services. The inventive network architecture introduces QoS into the ADN, in a manner that enables the delivery of sophisticated and demanding IP-based services to subscribers, does not affect existing Internet tiers of service, and is cost-effective in terms of initial costs, build-out, and ongoing operations. The architecture utilizes a switch capable of examining and selectively forwarding packets or frames based on higher layer information in the protocol stack, that is to say on information that is encapsulated in the layer-2 information utilized to define normal connectivity through the network. The switch enables segregation of upstream traffic by type and downstream aggregation of Internet traffic together with traffic from a local vertical services domain.

Claims

1. A method of providing a combination of access to two different network domains through an access data network, comprising the steps of:

provisioning a logical communication circuit extending from a customer premises through the access data network to a communication access node coupled to a first network domain,

wherein the provisioning comprises defining the logical communication circuit in terms of a layer-2 protocol;

at an intermediate node along the logical communication circuit, examining communicated information in transmissions from the customer premises, for a protocol encapsulated within said layer-2 protocol, to distinguish transmission types;

forwarding each detected transmission of a first transmission type from the intermediate node to the communication access node over the logical communication circuit defined in terms of the layer-2 protocol; and

forwarding each detected transmission of a second type, different from the first transmission type, to a second network domain logically separate from the first network domain.

2. A method as in claim 1, wherein:

the first network domain comprises a packet-switched wide area internetwork, and

the second network domain comprises a locally implemented vertical services domain network.

3. A method as in claim 2, further comprising:

receiving first downstream transmissions intended for the customer premises, over the logical communication circuit from the wide area internetwork at the intermediate node;

receiving second downstream transmissions intended for the customer premises from the vertical services domain at the intermediate node; and

inserting the second downstream transmissions into the logical communication circuit, to combine the first and second downstream transmissions for communication over the logical communication circuit from the intermediate node to the customer premises.

4. A method as in claim 1, wherein the step of defining the logical communication circuit in terms of a layer-2 protocol comprises provisioning a permanent virtual circuit from the customer premises of the subscriber to the communication access node.

5. A method as in claim 4, wherein the provisioning of the permanent virtual circuit provisions as Asynchronous Transfer Mode (ATM) permanent virtual circuit from the customer premises of the subscriber to the communication access node.

6. A method as in claim 1, wherein the step of examining communicated information comprises distinguishing between types of local area network protocol transmissions encapsulated within said layer-2 protocol in the transmissions from the customer premises.

7. A method as in claim 6, wherein the first transmission type comprises a type of the local area network protocol adapted for internetwork service provider applications.

8. A method as in claim 7, wherein:

the local area network protocol comprises an Ethernet protocol, and

the first transmission type comprises point-to-point protocol over Ethernet.

9. A method as in claim 8, wherein the layer-2 protocol comprises Asynchronous Transfer Mode (ATM).

10. A method as in claim 1, further comprising:

receiving first downstream transmissions intended for the customer premises, over the logical communication circuit from the first network domain;

receiving second downstream transmissions intended for the customer premises from the second network domain at the intermediate node; and

inserting the second downstream transmissions into the logical communication circuit, to combine the first and second downstream transmissions for communication over the logical communication circuit from the intermediate node to the customer premises.

11. A method as in claim 10, wherein transmissions of the second type and the second downstream transmissions relate to at least one service selected from the group consisting essentially of:

digital voice telephone service, digital video service, digital audio service, and web caching.

12. A method as in claim 10, further comprising regulating flow of transmissions of the second type and flow of the second downstream transmissions, to provide a quality of service conforming to a guaranteed quality of service defined in a service level agreement with the subscriber.

13. A method as in claim 10, wherein the second downstream transmissions carry multicast information.

14. A method of segregating traffic for at least two different network domains, comprising:

establishing a contiguous layer 2 protocol connectivity upstream from a customer premises to a communication access node coupled to a first network domain;

at an intermediate point along the contiguous connectivity, distinguishing upstream transmissions of at least two types from the customer premises based on information encapsulated within said layer-2 protocol;

forwarding each distinguished transmission of a first transmission type from the intermediate point to the first network domain; and

forwarding each detected transmission of a second type, other than the first transmission type, from the intermediate point to a second network domain logically separated from the first network domain.

15. A method as in claim 14, wherein said layer-2 protocol comprises asynchronous transfer mode (ATM), and the step of distinguishing comprises distinguishing local area network protocol types based on examination of local area network protocol information contained in payloads of ATM cells.

16. A method as in claim 14, further comprising aggregating downstream transmissions from the first network domain received at the intermediate point via said contiguous layer 2 protocol connectivity with transmissions intended for the customer premises received at the intermediate node from the second network domain, for combined transport from the intermediate node to the customer premises.

17. A method of providing a combination of wide area internetwork service and vertical communication services through a local access network, comprising the steps of:

provisioning a logical communication circuit to support service to the wide area internetwork, the logical communication circuit extending from a customer premises to a communication access node coupled to the wide area internetwork, wherein the provisioning comprises defining the logical communication circuit in terms of a layer-2 protocol;

at an intermediate node along the communication circuit, examining communicated information in transmissions from the customer premises, for protocol layers encapsulated within said layer-2 protocol, to distinguish transmission types;

forwarding each detected transmission of a first transmission type from the intermediate node to the communication access node over the logical communication circuit defined in terms of said layer-2 protocol; and

forwarding each detected transmission type of a second type, other than the first transmission type, from the logical communication circuit at the intermediate node to a vertical services network coupled locally to the intermediate node.

18. A method as in claim 17, further comprising:

receiving first downstream transmission intended for the customer premises from the communication access node at the intermediate node, over the logical communication circuit;

receiving second downstream transmissions intended for the customer premises from the vertical services network at the intermediate node; and

inserting the second downstream transmissions into the logical communication circuit, to combine the first and second downstream transmissions for communication over the logical communication circuit from the intermediate node to the customer premises.

19. A method as in claim 18, further comprising regulating flow of said transmissions of the first type and flow of the first downstream transmissions, to rates corresponding to a subscriber-selected grade of service.

20. A method as in claim 18, further comprising regulating flow of said transmissions of the second type and flow of the second downstream transmissions, to provide a guaranteed quality of service in conformance with a service level agreement with a subscriber.

21. A method as in claim 18, wherein the transmissions from the customer premises utilize an upstream channel of a digital subscriber line circuit from the customer premises to the intermediate node, and transmissions to the customer premises use a downstream channel of said digital subscriber line circuit.

22. A method as in claim 21, further comprising adapting communications over the digital subscriber line circuit to line conditions, to maximize transmission rates.

23. A method as in claim 21, wherein the digital subscriber line circuit comprises rate-adaptive asymmetrical digital subscriber line modems.

24. A method as in claim 17, wherein the step of defining the logical communication circuit in terms of a layer-2 protocol comprises provisioning a permanent virtual circuit from the customer premises of the subscriber to the communication access node coupled to the wide area internetwork.

25. A method as in claim 17, wherein the step of examining communicated information comprises distinguishing between types of local area network protocol transmissions encapsulated within said layer-2 protocol.

26. A method as in claim 25, wherein the first transmission type comprises a type of the local area network protocol adapted for internetwork service provider applications.

27. A method as in claim 17, wherein the provisioning step further comprises:

establishing a maximum upstream transmission rate and a maximum downstream transmission rate corresponding to a subscriber-selected grade of service; and

establishing control parameters in at least one of the nodes for limiting upstream and downstream transmissions over the logical communication circuit between the nodes to the established maximum upstream and downstream transmission rates.

28. A method of providing a combination of wide area internetwork service and vertical communication services through a local access network to a plurality of subscribers, comprising the steps of:

for each respective subscriber, provisioning a respective logical communication circuit to support a respective subscriber selected grade of service to the wide area internetwork, each logical communication circuit extending from a customer premises of the respective subscriber to a communication access node coupled to the wide area internetwork;

communicating to and from each customer premises from and to an intermediate node along the logical communication circuits, at optimum rates of physical links to the customer premises, which rates are at or above rates corresponding to respective subscriber-selected grades of service;

segregating upstream transmissions from respective logical communication circuits intended for a vertical services domain, at the intermediate node, from transmissions on the respective logical communication circuits intended to continue on to the communication access node;

providing downstream transmissions for the subscribers from the vertical services domain to the intermediate node and receiving the segregated upstream transmissions from subscribers in the vertical services domain from the intermediate node;

aggregating downstream transmissions from the communication access node and the downstream transmissions from the vertical services domain for each subscriber onto each respective logical communication circuit; and

regulating traffic for each of the logical communication circuits between the intermediate node and the communication access node, such that rates thereof conform to rates corresponding to the respective subscriber-selected grades of service.

29. A method as in claim 28, wherein the step of aggregating downstream transmissions onto the logical communication circuits comprises replicating a multicast transmission from the vertical services domain onto each of a plurality of the logical communication circuits.

30. A method as in claim 28, further comprising providing guaranteed quality of service for at least some subscriber communications going to and from the vertical services domain via the intermediate node.

31. A method as in claim 28, wherein the aggregating for each respective logical communication circuit comprises:

establishing at least two queues of transmissions intended for the respective subscriber, the queues having different assigned levels of priority;

assigning each transmission for the respective subscriber a priority level based on an application of the transmission;

adding each transmission for the respective subscriber to one of the queues corresponding to a respective assigned priority level;

selecting transmissions from the queues in accord with an algorithm, so as to maintain at least one predefined quality of service level for the respective subscriber; and

inserting the transmissions into the respective logical communication circuit in order of the selection in accord with the algorithm.

32. A method as in claim 28, wherein the step of communicating to and from each customer premises comprises implementing rate adaptive digital subscriber line communications over lines extending at least part-way between the customers premises and the intermediate node.

33. A method as in claim 32, wherein the lines between the customers premises and the intermediate node comprise twisted wire pairs.

34. A method as in claim 28, wherein the logical communication circuits comprise virtual circuits.

35. A method as in claim 34, wherein the virtual circuits comprise Asynchronous Transfer Mode (ATM) permanent virtual circuits.

36. A method as in claim 28, wherein the communication access node provides access to at least one of a plurality of available Internet Service Providers.

37. A method as in claim 28, wherein the vertical services domain provides communications for any one or more of the following vertical services:

voice over Internet Protocol telephone service, multicast video service, video on demand service, multicast audio service, audio on demand service, multimedia broadcast service and virtual local area network service.

38. A method, comprising:

providing rate adaptive digital subscriber line communications from a digital subscriber line access multiplexer to a plurality of subscribers, over respective subscriber lines, at maximum rates respective line conditions will allow;

providing wide area access services for each subscriber, from an access router node coupled with the digital subscriber line access multiplexer to a node coupled to a wide area internetwork, at rates conforming to service level agreements with respective subscribers; and

for each subscriber, aggregating and segregating communications for a vertical services domain with the wide area access services at the router access node based on a protocol within a layer-2 protocol, for communication therewith via the maximized-rate digital subscriber line communications.

39. An access data network, for providing access services to at least two different network domains, comprising:

a communication access node coupled to a first network domain;

a plurality of digital subscriber line transceivers coupled to network ends of subscriber lines, for data communication with transceivers coupled to customer premises ends of respective subscriber lines;

an access switch coupled for data communication with the digital subscriber line transceivers, for receiving data from customer premises equipment via respective ones of the digital subscriber line transceivers and for supplying data intended for transmission to predetermined customer premises equipment to the respective ones of the digital subscriber line transceivers;

a high-speed data link between the access switch and the communication access node;

a layer-2 protocol logical communication circuit provisioned through the access switch and the high-speed data link for each subscriber line, wherein each logical communication circuit is provisioned to extend from a respective customer premises to the communication access node;

a second network domain coupled logically to the access switch; and

a controller associated with the access switch, for examining communicated information in transmissions from respective customer premises, for a protocol encapsulated within said layer-2 protocol, to distinguish transmission types, and in response to cause the switch to;

forward each detected transmission of a first transmission type to the communication access node over a respective one of the logical communication circuits defined in terms of the layer-2 protocol, and

forward each detected transmission of a second type, different from the first transmission type, to the second network domain.

40. A network as in claim 39, wherein the access switch also:

receives first downstream transmissions intended for one customer premises from the communication access node, over a respective logical communication circuit;

receives second downstream transmissions intended for the one customer premises from the second network domain; and

inserts the second downstream transmissions into the respective logical communication circuit, to combine the first and second downstream transmissions for transport via one of the digital subscriber line transceivers which serves the one customer premises.

41. A network as in claim 39, wherein each of the logical communication circuits comprises a virtual circuit.

42. A network as in claim 39, wherein the access switch comprises an Asynchronous Transfer Mode (ATM) switch.

43. A network as in claim 42, wherein each of the virtual circuits comprises an Asynchronous Transfer Mode (ATM) permanent virtual circuit.

44. A network as in claim 39, wherein the access switch comprises a router.

45. A network as in claim 39, wherein said controller comprises means for distinguishing between types of local area network protocol transmissions encapsulated within said layer-2 protocol.

46. A network as in claim 45, wherein the first transmission type comprises a type of the local area network protocol adapted for internetwork service provider applications.

47. A network as in claim 46, wherein:

the local area network protocol comprises an Ethernet protocol, and

the first transmission type comprises point-to-point protocol over Ethernet.

48. A network as in claim 39, wherein:

the digital subscriber line transceivers comprise asymmetrical digital subscriber line (ADSL) terminal units (ATUs);

the network further comprises a multiplexer providing data communications coupling between the ATUs and the access switch; and

the ATUs together with the multiplexer form a digital subscriber line access multiplexer (DSLAM).

49. A network as in claim 39, wherein at least one of the digital subscriber line transceivers is adapted for communication over an optical link.

50. A network as in claim 39, wherein at least one of the digital subscriber line transceivers is adapted for communication over a wireless link.

51. A network as in claim 39, wherein at least one of the digital subscriber line transceivers is adapted for communication over a telephone line.

52. An access data network, for providing a combination of wide area internetwork access service and vertical communication services, comprising:

a communication access node coupled to the wide area network;

a plurality of digital subscriber line transceivers coupled to network ends of subscriber lines, for data communication with transceivers coupled to customer premises ends of respective subscriber lines;

an access switch coupled for data communications with the digital subscriber line transceivers, for receiving data from customer premises equipment via respective ones of the digital subscriber line transceivers and for supplying data intended for transmission to predetermined customer premises equipment to the respective ones of the digital subscriber line transceivers;

a high-speed data link between the access switch and the communication access node;

a logical communication circuit provisioned in terms of layer-2 protocol through the access switch and the high-speed data link for each subscriber line, wherein each logical communication circuit is provisioned to extend from a respective customer premises of the subscriber to the communication access node and to support a respective subscriber-selected grade of service to the wide area internetwork between the access switch and the communication access node;

a vertical services network coupled logically to the access switch; and

means associated with the access switch for examining communicated information in transmissions on the logical communication circuit from each respective customer premises, encapsulated with said layer-2 protocol, to distinguish transmission types;

wherein;

the access switch routes each detected transmission of a first transmission type, received from a customer premises over the respective logical communication circuit, over the respective logical communication circuit on the high-speed data link to the communication access node, at a transmission rate corresponding to the respective subscriber-selected grade of service, and

the access switch extracts each detected transmission of a type other than the first transmission type from the respective logical communication circuit for routing to the vertical services network.

53. A network as in claim 52, wherein the access switch also:

receives first downstream transmissions intended for respective customer premises from the communication access node, over the logical communication circuits;

receives second downstream transmissions intended for the respective customer premises from the vertical services network; and

inserts the second downstream transmission into logical communication circuits for the respective customer premises, to combine the first and second downstream transmissions for communication over the logical communication circuits to the customer premises.

54. A network as in claim 52, wherein the access switch comprises an Asynchronous Transfer Mode (ATM) switch.

55. A network as in claim 52, wherein said means comprises means for distinguishing between types of local area network protocol transmissions encapsulated within said layer-2 protocol.

56. A network as in claim 55, wherein the first transmission type comprises a type of the local area network protocol adapted for internetwork service provider applications.

57. A data communication network, for providing a combination of wide area internetwork service and vertical communication services, comprising:

a communication access node coupled to the wide area internetwork;

a physical communication circuit for coupling a customer premises communication equipment of the subscriber;

a logical communication circuit provisioned to support a subscriber-selected grade of service to the wide area internetwork, the logical communication circuit extending through the physical communication circuit and extending to the communication access node;

wherein the provisioning defines the logical communication circuit in terms of a layer-2 protocol; and

an intermediate communication node coupled to the physical communication circuit at an intermediate location along the logical communication circuit, the intermediate communication node comprising;

(a) a controller for examining communicated information in transmissions from the customer premises, for protocol encapsulated within said layer-2 protocol, to distinguish transmission types; and

(b) a switch fabric coupled to the logical communication circuit and responsive to said controller, for forwarding each detected transmission of a first transmission type from the intermediate communication node to the communication access node over the logical communication circuit, and for forwarding each detected transmission of a second type, different from the first transmission type, from the logical communication circuit through a port for connection to a vertical services domain.

58. A data communication network as in claim 57, further comprising a multiplexer coupled between the physical communication circuit and the intermediate communication node for providing communications between the intermediate communication node and at least one other physical communication circuit to another customer premises equipment.

59. A data communication network as in claim 57, wherein:

the switch fabric comprises an asynchronous transfer mode (ATM) switch, and

the logical communication circuit comprises a permanent virtual circuit defined in Asynchronous Transfer Mode (ATM) protocol through the switch fabric.

60. A data communication network as in claim 57, wherein said controller distinguishes between types of local area network protocol transmissions encapsulated within said layer-2 protocol.

61. A data communication network as in claim 60, wherein the first transmission type comprises a type of the local area network protocol adapted for internetwork service provider applications.

62. A data communication network as in claim 61, wherein:

the local area network protocol comprises an Ethernet protocol, and

the first transmission type comprises point-to-point protocol over Ethernet.

63. A data communication network as in claim 57, wherein the physical communication circuit comprises a rate-adaptive asynchronous digital subscriber line transceiver for maximizing transmission rates over the physical communication circuit.

64. A data communication network as in claim 63, wherein the physical communication circuit further comprises:

a twisted wire pair circuit extending from the transceiver to a customer premises of the subscriber;

a splitter/combiner coupled between the transceiver and the twisted wire pair circuit, for maintaining separation on the twisted wire pair circuit between the logical communication circuit and a voice-grade telephone communication channel, and for coupling the logical communication circuit on the twisted wire pair circuit to the transceiver and coupling the voice-grade telephone communication channel on the twisted wire pair circuit to a switch of the public switched telephone network.

65. A data communication network as in claim 57, further comprising a vertical services network coupled to the intermediate communication node to form the vertical service domain, and a content provider interface coupled for communication via the vertical services network.

66. A data communication network as in claim 65, wherein the content provider interface is configured for providing an Internet Protocol (IP) interface on the vertical services network.

67. A data communication network as in claim 66, wherein the content provider interface is configured for providing an interface for digital video content services.

68. A data communication network as in claim 67, wherein the interface for digital video content services comprises a source of digital broadcast video programming.

69. A data communication network as in claim 67, wherein the interface for digital video content services comprises a digital video-on-demand server.

70. A data communication network as in claim 65, wherein the content provider interface is configured for providing a packetized-voice telephone communication service.

71. A data communication network as in claim 57, wherein the intermediate communication node comprises an access router comprising said controller and said switch fabric.

72. A data switch for use in a communication network, comprising:

a first interface, for data communication to and from data equipment at a plurality of customer premises;

a second interface, for communication with a first network domain over low-layer protocol logical pipes carrying subscribers traffic for the first network domain in accord with a first type of a higher level protocol;

a third interface, for communication with a second network domain using a second type of the higher level protocol;

a switch fabric coupled to the interfaces; and

a controller coupled to the switch fabric, for controlling routing of traffic through the fabric between the interfaces, wherein;

upstream transmissions received through the first interface are segregated and routed either to the second interface or to the third interface, depending on whether the transmissions utilize the first or second type of the higher level protocol, respectively, and

downstream communications received via the second and third interfaces for respective customer premises data equipment are aggregated and forwarded through the first interface.

73. A data switch as in claim 72, further comprising a logical circuit provisioned through the switch fabric from the first interface to the second interface for each customer premises.

74. A data switch as in claim 72, wherein the switch fabric comprises an asynchronous transfer mode (ATM) switch fabric.

75. A data switch as in claim 72, wherein the switch fabric comprises an Ethernet switch fabric.

76. A data switch as in claim 72, wherein:

the lower-layer protocol is asynchronous transfer mode (ATM), and the higher level protocol comprises a local area network protocol contained within ATM cells.

77. A data switch as in claim 76, wherein the first type of the higher level protocol comprises a type of the local area network protocol adapted for access to Internet service providers.

78. A data switch for use in a local digital subscriber line communication network, comprising:

a first interface, for data communication to and from data equipment at a plurality of customer premises;

a second interface, for communication with a wide area internetwork over layer-2 protocol logical pipes carrying subscribers wide area internetwork traffic in accord with a first type of protocol encapsulated within the layer-2 protocol;

a third interface, for communication with a vertical services domain network using a second type of protocol encapsulated within the layer-2 protocol;

a switch fabric coupled to the interfaces; and

a controller coupled to the switch fabric, for controlling routing of traffic through the fabric between the interfaces, wherein;

upstream transmissions received through the first interface are bifurcated and forwarded either through the second interface or through the third interface, depending on whether the transmissions utilize the first or second type of the protocol encapsulated within the layer-2 protocol, respectively, and

downstream communications received via the second and third interfaces for respective customer premises data equipment are aggregated and forwarded via respective ones of the layer-2 protocol logical pipes through the first interface.