Meru Networks Patent Grants

Differential signal-to-noise ratio based rate adaptation

Granted: June 4, 2013
Patent Number: 8456993
Systems and methods for implementing a differential signal to noise ratio (DSNR) based rate adaptation for wireless networks are disclosed. The described methods probabilistically adapt the rate of data transmission based on an assessment of the causes of data loss. The described methods include determining a DSNR for data transmission during a predetermined window of time and adapting the transmission rate in a probabilistic manner responsive to the differential SNR and a differential…

Adaptive carrier sensing and power control

Granted: February 5, 2013
Patent Number: 8369794
Carrier sensing and power control, or trade-off among two or more communication parameters, can provide relative improvement in throughput. A sensing threshold or transmission power are varied, thus altering a sensing range and a transmission quality, thus maximizing a feasible transmission rate. Transmission power and rate are collectively altered to find a best throughput rate. A transmission rate can incremented after successful transmission and decremented after failed transmission,…

Omni-directional flexible antenna support panel

Granted: January 1, 2013
Patent Number: 8344953
An access point housing structure includes a first enclosure, a second enclosure to house an array of antenna patches, and an omni-directional hinge component. The first enclosure includes a first coupling mechanism located near one of the corners of the first enclosure. The second enclosure includes a second coupling mechanism located near a corner corresponding to the location of the first coupling mechanism. The omni-directional hinge component connects to the first coupling mechanism…

Selective suppression of 802.11 ACK frames

Granted: December 4, 2012
Patent Number: 8325753
ACK messages by access points are suppressed when those access points receive messages from wireless stations for which those access points should not respond. This might occur in wireless communication systems based upon 802.11 protocols in which seamless mobility is desired, with a system controller that assigns wireless stations to specific access points. The access point examines an incoming message from a wireless device to decide whether or not to suppress a responsive ACK message…

Flow classes

Granted: October 23, 2012
Patent Number: 8295177
Flows are grouped into flow classes, each of which is assigned flow class treatment rules, which might combine application of both firewall and QoS treatments. When a flow is identified as a member of a flow class, traffic for that flow can be treated according to treatment rules collectively with other flows assigned to that flow class. New flows not already members of an already-defined flow class are examined according to a set of flow class assignment rules, which have the effect of…

Three-dimensional wireless virtual reality presentation

Granted: October 9, 2012
Patent Number: 8284191
The invention provides techniques, including methods and systems, capable of displaying wireless network information regarding various wireless parameters in a three-dimensional (3D) virtual reality environment. The methods and systems provide graphical information to permit a network administrator to view and alter the wireless network virtually at one or more remote locations without being physically present at the remote location.

Diagnostic structure for wireless networks

Granted: August 7, 2012
Patent Number: 8238834
A set of techniques includes devices, methods, and user interfaces, capable of conducting proactive automated tests of a wireless system, and capable of operating while the wireless system is conducting its normal operations. A diagnostic device not controlled by the wireless system controls drivers and clients in that wireless system's access points, with the effect that the diagnostic device can inject message traffic into the wireless system while simulating clients of that system.…

Omni-directional antenna supporting simultaneous transmission and reception of multiple radios with narrow frequency separation

Granted: April 17, 2012
Patent Number: 8160664
An omni-directional antenna supporting simultaneous transmission/reception, from the same AP, on multiple frequencies, allowing each AP to communicate using each possible frequency. Each AP multiplexes its outgoing signals onto its transmitting antenna, and de-multiplexes its incoming signals from its receiving antenna. The transmitting and receiving antennae are each substantially located in each other's NULL zone (or one is in the NULL zone of the other). The AP can transmit/receive on…

Multiuser detection and interference suppression techniques for direct sequence spread spectrum systems in which all users employ same spreading code

Granted: March 27, 2012
Patent Number: 8144668
The present invention considers a direct sequence spread spectrum system wherein every user employs the same spreading code. In a preferred embodiment, received signal is correlated with the training signal. Peaks of correlator output are used to identify the delays corresponding to the significant multipath components. The delays that are within a predetermined number of chips of each other are associated with a hypothesized user. In an alternate embodiment, a user separation technique…

Wireless diagnostics

Granted: March 27, 2012
Patent Number: 8145136
A method of analyzing a wireless network, including the steps of coupling a diagnostic station to a wireless network, injecting encapsulated wireless frames into that wireless network, forwarding encapsulated wireless frames within that wireless network, and in response to recognizing encapsulated wireless frames within that wireless network, de-encapsulating those wireless frames and forwarding them to that diagnostic station. Also, a system and a diagnostic station that can implement…

Omni-directional antenna supporting simultaneous transmission and reception of multiple radios with narrow frequency separation

Granted: January 24, 2012
Patent Number: 8103311
An omni-directional antenna supporting simultaneous transmission/reception, from the same AP, on multiple frequencies, allowing each AP to communicate using each possible frequency. Each AP multiplexes its outgoing signals onto its transmitting antenna, and de-multiplexes its incoming signals from its receiving antenna. The transmitting and receiving antennae are each substantially located in each other's NULL zone (or one is in the NULL zone of the other). The AP can transmit/receive on…

Access points using power over ethernet

Granted: December 20, 2011
Patent Number: 8081589
An access point coupled to an Ethernet port detects whether it is using power over Ethernet, and if so, adjusts its operation to maintain its power requirements within those capable of being supplied by power over Ethernet. The access point might include a detector capable of determining if external power is available, or if that access point is operating using power over Ethernet. If the access point is operating using power over Ethernet, it adjusts the operation of its radios,…

Security in wireless communication systems

Granted: November 22, 2011
Patent Number: 8064601
Wireless security is enforced at L1, in addition to or in lieu of other layers. AP's can switch dynamically from serving to scanning. Scanners listen for authorized frame headers. Scanners either receive, or allow authorized frames to be received, at their destination. Scanners kill unauthorized frames while they are still transmitting; scanners continue listening for and killing unauthorized frame headers until frame ending time demands their return to serving, multiplying their…

Controlling multiple-radio wireless communication access points when using power over Ethernet

Granted: August 30, 2011
Patent Number: 8010820
An access point coupled to an Ethernet port detects whether it is using power over Ethernet, and if so, adjusts its operation to maintain its power requirements within those capable of being supplied by power over Ethernet. The access point might include a detector capable of determining if external power is available, or if that access point is operating using power over Ethernet. If the access point is operating using power over Ethernet, it adjusts the operation of its radios,…

Flow inspection

Granted: February 22, 2011
Patent Number: 7894436
A communication system detects particular application protocols in response to their message traffic patterns, which might be responsive to packet size, average packet rate, burstiness of packet transmissions, or other message pattern features. Selected message pattern features include average packet rate, maximum packet burst, maximum future accumulation, minimum packet size, and maximum packet size. The system maintains a counter of packet tokens, each arriving at a constant rate, and…

Seamless mobility in wireless networks

Granted: November 2, 2010
Patent Number: 7826426
AP's associated with a communication network and any wireless devices desiring contact, operated according to a protocol in which each wireless device selects AP's with which to communicate. A system coordinator causes the AP's to operate so as to guide each wireless device to an AP selected by the system coordinator. This has the effect that, notwithstanding that the protocol involves having the wireless device make the selection of AP, functionally, the AP's make the selection for it.…

Wireless rate adaptation

Granted: October 5, 2010
Patent Number: 7808908
A method of adapting wireless transmission rates that includes the steps of determining at least a short-term loss ratio for wireless communication during a window of time, and adapting a transmission rate responsive to at least the short-term loss ratio, a maximum tolerable loss threshold for the communication during the window, and an opportunistic rate increase threshold for the communication during the window. A size of the window, the maximum tolerable loss threshold, and the…

Differential signal-to-noise ratio based rate adaptation

Granted: July 13, 2010
Patent Number: 7756059
Systems and methods for implementing a differential signal to noise ratio (DSNR) based rate adaptation for wireless networks are disclosed. The described methods probabilistically adapt the rate of data transmission based on an assessment of the causes of data loss. The described methods include determining a DSNR for data transmission during a predetermined window of time and adapting the transmission rate in a probabilistic manner responsive to the differential SNR and a differential…

Multiuser detection and interference suppression techniques for direct sequence spread spectrum systems in which all users employ same spreading code

Granted: November 18, 2008
Patent Number: 7453855
The present invention considers a direct sequence spread spectrum system wherein every user employs the same spreading code. In a preferred embodiment, received signal is correlated with the training signal. Peaks of correlator output are used to identify the delays corresponding to the significant multipath components. The delays that are within a predetermined number of chips of each other are associated with a hypothesized user. In an alternate embodiment, a user separation technique…