CA2585881A1 - A method for multicast load balancing in wireless lans - Google Patents

A method for multicast load balancing in wireless lans Download PDF

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Publication number
CA2585881A1
CA2585881A1 CA002585881A CA2585881A CA2585881A1 CA 2585881 A1 CA2585881 A1 CA 2585881A1 CA 002585881 A CA002585881 A CA 002585881A CA 2585881 A CA2585881 A CA 2585881A CA 2585881 A1 CA2585881 A1 CA 2585881A1
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Prior art keywords
multicast
access point
multicast stream
stream
client
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Granted
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CA002585881A
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French (fr)
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CA2585881C (en
Inventor
Robert C. Meier
Stuart Norman
Douglas A. Smith
Nancy Cam Winget
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Cisco Technology Inc
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Cisco Technology, Inc.
Robert C. Meier
Stuart Norman
Douglas A. Smith
Nancy Cam Winget
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Publication of CA2585881A1 publication Critical patent/CA2585881A1/en
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Publication of CA2585881C publication Critical patent/CA2585881C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/13—Flow control; Congestion control in a LAN segment, e.g. ring or bus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/15—Flow control; Congestion control in relation to multipoint traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/78—Architectures of resource allocation
    • H04L47/782—Hierarchical allocation of resources, e.g. involving a hierarchy of local and centralised entities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/80—Actions related to the user profile or the type of traffic
    • H04L47/801—Real time traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/80—Actions related to the user profile or the type of traffic
    • H04L47/806—Broadcast or multicast traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/82—Miscellaneous aspects
    • H04L47/824—Applicable to portable or mobile terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/04—Registration at HLR or HSS [Home Subscriber Server]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Abstract

A method for multicast load balancing in a wireless network having a plurality of access points. The method includes setting a maximum Internet protocol multicast bandwidth for the access points, receiving an admissions control request from a client at one of the access points, and determining whether the admissions control request from the client is for an admitted or unadmitted multicast stream at the access point. The access point is responsive to the admissions control request for the admitted multicast stream by servicing the admitted multicast stream and to the admissions control request for the unadmitted multicast stream by servicing the unadmitted multicast stream where the bandwidth required for the unadmitted multicast stream, plus that portion of the access point bandwidth currently used for all existing downlink multicast streams, does not exceed the maximum internet protocol multicast bandwidth for the access point.

Claims (49)

1. An access point, comprising:

a transceiver for receiving an admissions control request from a client; and a controller coupled to the transceiver for controlling the operation of the transceiver and setting a maximum multicast bandwidth for the access point;

the controller configured for determining whether the admissions control request from the client is for one of an admitted multicast stream and an unadmitted multicast stream, each stream having a bandwidth;

wherein the controller is responsive to the admissions control request for the admitted multicast stream by servicing the admitted multicast stream; and wherein the controller is responsive to the admissions control request for the unadmitted multicast stream by servicing the unadmitted multicast stream where the bandwidth required for the unadmitted multicast stream, plus that portion of the access point bandwidth currently used for all existing downlink multicast streams is less than a maximum multicast bandwidth for the access point.
2. The access point of claim 1, wherein the access point is a member of Multicast Admissions Control Group.
3. The access point of claim 1, wherein the access point advertises that explicit admissions controls are in force for multicast streams so that the client is ensured that the requested multicast stream will not be rate limited.
4. The access point of claim 1, the controller further configured for determining whether a requested multicast stream is being serviced by another access point;

wherein the access point is responsive to the determination of whether the requested multicast stream is being serviced by another access point by servicing the requested multicast stream where the requested multicast stream is not being serviced by another access point; and wherein the access point is responsive to the determination of whether the requested multicast stream is being serviced by another access point by denying access to the client where the requested multicast stream is being serviced by another access point.
5. The access point of claim 4, wherein the access point is further responsive to the determination of whether the requested multicast stream is being serviced by another access point by directing the client to the access point servicing the requested multicast stream where the requested multicast stream is being serviced by another access point.
6. The access point of claim 5, wherein multicast admissions control is coordinated by a central access point controller that is in communication with the access point.
7. The access point of claim 6, wherein the access point forwards the admissions control request from the client to the central access point controller.
8. The access point of claim 6, wherein the central access point controller applies load balancing to admitted multicast streams to select the access point for servicing the client.
9. The method in claim 8, wherein the central access point controller comprises an IP multicast router that measures the bandwidth consumed by an IP multicast stream, which it is forwarding, over a period of time; where the IP multicast router forwards bandwidth information for IP multicast streams to the controller; and where the controller uses the bandwidth information to determine if a multicast stream can be admitted at an access point.
10. The access point of claim 1, wherein the client is able to determine whether the access point will accept the admissions control request for the multicast stream by including the admissions control request in a Probe Request.
11. The access point of claim 10, wherein the access point indicates multicast bandwidth availability in at least one of a Probe Response and a Beacon frame.
12. The access point of claim 1 wherein a client associated to a second access point sends an admissions control request message to the access point and receives an admission control response message from the access point to determine if the access point will accept a downlink IP multicast stream.
13. An access point, comprising:

a transceiver for receiving a request from a client for a multicast stream, wherein at least one of the access point and the client does not support admissions control;
and a controller coupled to the transceiver configured for determining whether the request is for one of an admitted multicast stream and an unadmitted multicast stream;
wherein the access point is responsive to the request by forwarding an admitted multicast stream to the client; and wherein the access point is responsive to the request for an unadmitted multicast stream by rate limiting the unadmitted multicast stream to the client.
14. The access point of claim 13, the controller further configured for categorizing the multicast stream, identified by one of a destination multicast address, and a destination multicast address and a unicast source address, as one of admitted and unadmitted.
15. The access point of claim 13, wherein admissions control is based on Internet Group Management Protocol snooping.
16. A method for multicast load balancing in a wireless network having a plurality of access points, comprising:

setting a maximum Internet protocol multicast bandwidth for the access points;

receiving an admissions control request from a client at one of the access points; and determining whether the admissions control request from the client is for one of an admitted multicast stream and an unadmitted multicast stream at the access point, each stream having a bandwidth;

wherein the one of the access points is responsive to the admissions control request for the admitted multicast stream by servicing the admitted multicast stream; and wherein the one of the access points is responsive to the admissions control request for the unadmitted multicast stream by servicing the unadmitted multicast stream where the bandwidth required for the unadmitted multicast stream, plus that portion of the access point bandwidth currently used for all existing downlink multicast streams, does not exceed the maximum internet protocol multicast bandwidth for the access point.
17. The method of claim 16, further comprising forming a Multicast Admissions Control Group from the plurality of access points.
18. The method of claim 16, wherein at least one of the access points advertises that explicit admissions controls are in force for multicast streams.
19. The method of claim 16, wherein the multicast admissions control is used to distribute multicast streams across access points in the same coverage area.
20. The method of claim 16, further comprising:

determining whether a requested multicast stream is being serviced by another access point within a Multicast Admissions Control Group;

wherein the one of the access points is responsive to the determination of whether the requested multicast stream is being serviced by another access point by servicing the requested multicast stream where the requested multicast stream is not being serviced by another access point; and wherein the one of the access points is responsive to the determination of whether the requested multicast stream is being serviced by another access point by denying access to the client where the requested multicast stream is being serviced by another access point.
21. The method of claim 20, wherein the one of the access points is further responsive to the determination of whether the requested multicast stream is being serviced by another access point by directing the client to the access point servicing the requested multicast stream where the requested multicast stream is being serviced by another access point.
22. The method of claim 21, wherein admissions control are coordinated by a central access point controller that is in communication with the plurality of access points.
23. The method of claim 22, wherein the plurality of access points forward multicast admissions control requests from clients to the central access point controller.
24. The method of claim 22, wherein the central access point controller applies load balancing to admitted multicast streams to select a parent access point for the client.
25. The method of claim 16, wherein the client is able to determine which access point will accept the admissions control request for a downlink multicast stream by including the admissions control request in a Probe Request.
26. The method of claim 25, wherein the one of the access points indicates multicast bandwidth availability in at least one of a Probe Response and a Beacon frame.
27. A method for multicast load balancing in a wireless network having a plurality of access points, comprising:

receiving a request from a client for a multicast stream at one of the access points, wherein at least one of the one of the access points and the client does not support admissions control; and determining whether the admissions control request is for one of an admitted multicast stream and an unadmitted multicast stream;

wherein the one of the access points is responsive to the request by forwarding an admitted multicast stream to the client; and wherein the one of the access points is responsive to the request for the unadmitted multicast stream by rate limiting the unadmitted multicast stream to the client.
28. The method of claim 27, further comprising categorizing the multicast stream, identified by one of a destination multicast address and a destination multicast address and unicast source address, as one of admitted and unadmitted.
29. The method of claim 27, wherein the admissions control is based on Internet Group Management Protocol snooping.
30. A computer-readable medium of instructions for multicast load balancing in a wireless network having a plurality of access points, comprising:

means for setting a maximum Internet protocol multicast bandwidth for the access points;

means for receiving an admissions control request from a client at one of the access points; and means for determining whether the admissions control request from the client is for one of an admitted multicast stream and an unadmitted multicast stream at the access point, each stream having a bandwidth;

wherein the one of the access points is responsive to the admissions control request for the admitted multicast stream by servicing the admitted multicast stream; and wherein the one of the access points is responsive to the admissions control request for the unadmitted multicast stream by servicing the unadmitted multicast stream where the bandwidth required for the unadmitted multicast stream, plus that portion of the access point bandwidth currently used for all existing downlink multicast streams, does not exceed the maximum internet protocol multicast bandwidth for the access point.
31. The computer-readable medium of instructions for multicast load balancing of claim 30, further comprising means for forming a Multicast Admissions Control Group from the plurality of access points.
32. The computer-readable medium of instructions for multicast load balancing of claim 31, wherein the one of the access points advertises that explicit admissions controls are in force for multicast streams so that the client is ensured that the requested multicast stream will not be rate limited.
33. The computer-readable medium of instructions for multicast load balancing of claim 30, wherein the multicast admissions control is used to distribute multicast streams across access points in the same coverage area.
34. The computer-readable medium of instructions for multicast load balancing of claim 29, further comprising:

means for determining whether a requested multicast stream is being serviced by another access point within a Multicast Admissions Control Group;

wherein the one of the access points is responsive to the determination of whether the requested multicast stream is being serviced by another access point by servicing the requested multicast stream where the requested multicast stream is not being serviced by another access point; and wherein the one of the access points is responsive to the determination of whether the requested multicast stream is being serviced by another access point by denying access to the client where the requested multicast stream is being serviced by another access point.
35. The computer-readable medium of instructions for multicast load balancing of claim 34, wherein the one of the access points is further responsive to the determination of whether the requested multicast stream is being serviced by another access point by directing the client to the access point servicing the requested multicast stream where the requested multicast stream is being serviced by another access point.
36. The computer-readable medium of instructions for multicast load balancing of claim 35, wherein admissions control are coordinated by a central access point controller means that is in communication with the plurality of access points.
37. The computer-readable medium of instructions for multicast load balancing of claim 36, wherein the plurality of access points forward multicast admissions control requests from clients to the central access point controller.
38. The computer-readable medium of instructions for multicast load balancing of claim 37, wherein the central access point controller applies load balancing to admitted multicast streams to select a parent access point for the client.
39. The computer-readable medium of instructions for multicast load balancing of claim 30, wherein the client is able to determine which access point will accept the admissions control request for a downlink multicast stream by including the admissions control request in a Probe Request.
40. The computer-readable medium of instructions for multicast load balancing of claim 39, wherein the access point indicates multicast bandwidth availability in at least one of a Probe Response and a Beacon frame.
41. A computer-readable medium of instructions for multicast load balancing in a wireless network having a plurality of access points, comprising:

means for receiving a request from a client for a multicast stream at one of the access points, wherein at least one of the one of the access points and the client does not support admissions control; and means for determining whether the admissions control request is for one of an admitted multicast stream and an unadmitted multicast stream;

wherein the one of the access points is responsive to the admissions control request by forwarding an admitted multicast stream to the client; and wherein the one of the access point is responsive to the admissions control request for the unadmitted multicast stream by rate limiting the unadmitted multicast stream to the client.
42. The computer-readable medium of instructions for multicast load balancing of claim 41, further comprising means for categorizing the multicast stream, identified by a destination multicast address, as one of admitted and unadmitted.
43. The computer-readable medium of instructions of claim 41, further comprising means for the admissions control to be based on Internet Group Management Protocol snooping.
44. A method for organizing a wireless LAN, comprising assigning an umbrella access points an umbrella channel that covers the entire wireless LAN

assigning at least one other access point a relatively high-bandwidth channel that covers a select Hot Spot area;

rate limiting a high-bandwidth downlink multicast streams on the umbrella access point; and migrating a client using an explicit admissions control signal to receive a high-bandwidth multicast streams, to a one of the at least one other access points.
45. The method in claim 44 further comprising organizing a group of at least two access points, which are covering the same Hot Spot area into a multicast admissions control group, wherein a high-bandwidth multicast stream is only forwarded on a single access point in the multicast admissions control group.
46. A method for managing multicast streams, comprising limiting the total bandwidth consumed by downlink multicast streams at an access point;
classifying a multicast stream as one of admitted and unadmitted;
determining the bandwidth for the multicast stream by measuring the bandwidth consumed by the multicast stream over a period of time; and admitting a new downlink multicast stream to an access point if the bandwidth required by the new multicast stream plus the bandwidth for existing multicast streams does not exceed the limit for all downlink multicast streams at the access point;
wherein an unadmitted multicast stream is rate-limited.
47. The method in claim 46 further comprising determining the bandwidth for IP multicast streams by an IP multicast router forwarding IP multicast bandwidth information to a controller by the IP
multicast router; and determining by the controller if a new multicast stream is admitted or unadmitted.
48. The method in claim 47 further comprising forwarding at least one of a multicast destination IP address, and a multicast destination IP address and a unicast source IP address, which identify a multicast stream, to the controller;
determining the admissions control status by the controller; and communicating by the controller the admissions control status to the access point.
49. The method in claim 48 further comprising obtaining at least one of a the multicast destination IP address, and the multicast destination IP address and the unicast source IP address from Internet Group Management Protocol Membership Report messages.
CA2585881A 2004-11-01 2005-10-11 A method for multicast load balancing in wireless lans Expired - Fee Related CA2585881C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/978,615 US7362776B2 (en) 2004-11-01 2004-11-01 Method for multicast load balancing in wireless LANs
US10/978,615 2004-11-01
PCT/US2005/036599 WO2006049821A2 (en) 2004-11-01 2005-10-11 A method for multicast load balancing in wireless lans

Publications (2)

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CA2585881A1 true CA2585881A1 (en) 2006-05-11
CA2585881C CA2585881C (en) 2011-05-31

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US (3) US7362776B2 (en)
EP (2) EP1807955B1 (en)
CN (1) CN101023609B (en)
CA (1) CA2585881C (en)
WO (1) WO2006049821A2 (en)

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