SELF-PROVISIONING OF A WIRELESS COMMUNICATION NETWORK USING COORDINATION OF DATA PLANE BEHAVIOR TO STEER STATIONS TO PREFERRED ACCESS POINTS

• US 20160112903A1
• Filed: 10/15/2014
• Published: 04/21/2016
• Est. Priority Date: 10/15/2014
• Status: Active Grant

• Current Assignee: Fortinet Inc.
• Original Assignee: Meru Networks, Inc. (Fortinet Inc.)
• Inventors: KAUSHIK, Anil, JUPUDI, Siva Rama Krishna Rao Yogendra, BHAMIDIPATI, Subrahmanyam
• Granted Patent: US 10,194,345 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 41/0896 Bandwidth or capacity management, i.e. automatically increasing or decreasing capacities flow or congestion control using dynamic resource allocation, e.g. in-call renegotiation, H04L47/76
• CPC Class Codes: H04L 41/40 using virtualisation of network functions or resources, e.g. SDN or NFV entities
• CPC Class Codes: H04L 43/08 Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
• CPC Class Codes: H04L 43/20 the monitoring system or the monitored elements being virtualised, abstracted or software-defined entities, e.g. SDN or NFV
• CPC Class Codes: H04L 45/56 Routing software
• CPC Class Codes: H04L 47/20 Traffic policing
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04W 28/0205 at the air interface dynamic wireless traffic scheduling H04W72/12
• CPC Class Codes: H04W 28/0231 based on communication conditions dynamic wireless traffic scheduling definition based on channel quality criteria H04W72/54
• CPC Class Codes: H04W 72/53 based on regulatory allocation policies
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A wireless communication network is self-provisioned using coordination of data plane behavior to steer stations to preferred access points. To do so, a policy concerning traffic flow for the wireless communication network is received. Data plane traffic flow is monitored at each of the plurality of access points distributed around the wireless communication network. At some point, it may be determined the data plane traffic flow at a first access point from needs to be reduced based on the data plane traffic flow relative to the policy. In response, a station is steered to a preferred access point using OpenFlow rules to affect data plane routing decisions at the access point (e.g., drop, delay, or reprioritize packets).

Claims

1. A computer-implemented method in a SDN (Software-Defined Networking) controller that automatically provisions a plurality of access points in a wireless communication network by coordinating data plane behavior of the plurality of access points to steer clients to preferred access points, the method comprising the steps of:

receiving a policy concerning traffic flow for the wireless communication network;

centrally monitoring data plane traffic flow at each of the plurality of access points distributed around the wireless communication network;

determining that the data plane traffic flow at a first access point from the plurality of access point needs to be reduced based on the data plane traffic flow relative to the policy;

steering at least one station to a second access point of the plurality of access point in order to adjust the data plane traffic flow by generating one more OpenFlow rules directed at how packets concerning the at least one station are handled by the first access point in the data planes in order to compel the at least one station to disconnect from the first access point; and

transmitting the one or more OpenFlow rules for implementation at a data pane of the first access point.

2. The method of claim 1, wherein:

generating the one or more OpenFlow rules comprises generating one more OpenFlow rules directed at how packets concerning the at least one connected station are handled by the plurality of access points in the data planes in order to compel the at least one connected station to disconnect from the first access point and to discontinue connection attempts at any of the plurality of access points except the second access point.

3. The method of claim 1, wherein monitoring the actual data plane traffic flow comprises:

receiving at least a partial stream of packets of the at least one station, the packets forwarded by the first access point to the SDN controller;

performing deep packet inspection of the partial packet stream of the at least one station; and

selecting the one or more stations for steering based on the policy with respect to characteristics of the partial packet stream revealed by the deep packet inspection.

4. The method of claim 3, further comprising:

prior to receiving the partial packet stream from the first access point, sending one or more OpenFlow rules to the first access point that defines traffic flows that should be forwarded to the SDN controller.

5. The method of claim 1, further comprising:

gathering network-wide information about traffic flows in data planes for a plurality of access points distributed around the wireless communication network;

predicting a data plane traffic flow at each of the plurality of access points based on the gathered information; and

determining that the data plane traffic flow at a first access point from the plurality of access point needs to be reduced based on the actual data plane traffic flow relative to the predicted data plane traffic flow.

6. The method of claim 1, wherein the plurality of access points continue to respond to connection attempts by the one or more stations per IEEE 802.11 protocol, despite implementing the one or more OpenFlow rules.

7. The method of claim 1, wherein the plurality of access points continue to broadcast at least one BSSID to stations within range, despite implementing the one or more OpenFlow rules.

8. The method of claim 1, wherein the plurality of access points continue to autonomously handle packets in control planes, while ceding handling of packets in the data planes to the SDN controller which centralizes control of a data plane of each of the plurality of access points.

9. The method of claim 1, wherein at least two of the plurality of access points implementing the one or more OpenFlow rules are manufactured by different vendors and have distinct operating systems.

10. The method of claim 1, wherein the one or more OpenFlow rules control layer 2 routing decisions.

11. The method of claim 1, further comprising:

implementing the one or more OpenFlow rules at the data plane of at least one network device outside of the plurality of access points.

12. A non-transitory computer-readable medium storing source code that, when executed by a processor, performs a method in a SDN (Software-Defined Networking) controller that automatically provisions a plurality of access points in a wireless communication network by coordinating data plane behavior of the plurality of access points to steer clients to preferred access points, the method comprising the steps of:

receiving a policy concerning traffic flow for the wireless communication network;

centrally monitoring data plane traffic flow at each of the plurality of access points distributed around the wireless communication network;

determining that the data plane traffic flow at a first access point from the plurality of access point needs to be reduced based on the data plane traffic flow relative to the policy;

steering at least one station to a second access point of the plurality of access point in order to adjust the data plane traffic flow by generating one more OpenFlow rules directed at how packets concerning the at least one station are handled by the first access point in the data planes in order to compel the at least one station to disconnect from the first access point; and

transmitting the one or more OpenFlow rules for implementation at a data pane of the first access point.

13. An SDN (Software-Defined Networking) controller that automatically provisions a plurality of access points in a wireless communication network by coordinating data plane behavior of the plurality of access points to steer clients to preferred access points, the SDN controller comprising:

a processor;

a memory, comprising;

a first module to receive a policy concerning traffic flow for the wireless communication network;

a second module to centrally monitor data plane traffic flow at each of the plurality of access points distributed around the wireless communication network;

a third module to determine that the data plane traffic flow at a first access point from the plurality of access point needs to be reduced based on the data plane traffic flow relative to the policy;

a fourth module to steer at least one station to a second access point of the plurality of access point in order to adjust the data plane traffic flow by generating one more OpenFlow rules directed at how packets concerning the at least one station are handled by the first access point in the data planes in order to compel the at least one station to disconnect from the first access point; and

a fifth module to transmit the one or more OpenFlow rules for implementation at a data pane of the first access point.