Autocell Laboratories Inc.

Other

3Com Corporation

Symbol Technologies, LLC

Piccata Fund Limited Liability Company

Extreme Networks, Inc.

Michael Yuen

Roger Durand

James Scott Hiscock

David Hill

Steven Lyle Gardner

Amit Sinha

Todd Nightingale

Glen Crowder

This invention describes systems and methods for combining the Wireless Local Area Network (WLAN) infrastructure and Wireless Intrusion Prevention Systems (WIPS) by leveraging a common radio platform equipped with more than one WLAN radio and a unified management system. The invention provides all the benefits of the WLAN, without sacrificing the 24&#xd7;7 dedicated security monitoring and performance troubleshooting available from an overlay WIPS system, while reducing the deployment cost and management complexity, by sharing a common hardware platform for the WLAN Access Point (AP) and WIPS sensor and leveraging an integrated management system.

Systems and methods for concurrent wireless local area network access and sensing

A system and method for pre-scanning for a wireless channel selection is provided. The methodology is executed by a first fixed location wireless device to improve initial channel selection in a wireless network where a plurality of fixed location wireless devices is contemporaneously initialized. On a predetermined channel, there is a transmission of at least one message including an identifier of the first device. On the predetermined channel, there is a transmission of at least one message indicative of readiness to transition to a subsequent processing step. The methodology also commences scanning for channel selection purposes.

Pre-scan for wireless channel selection

Migrating from a legacy spectrum allocation to a target spectrum allocation can be accomplished by adding new access points and, at a selected time, activating the new access points and deactivating the legacy access points with a remote network manager. Alternatively, the new access points can initially support legacy channels and at a selected time be reconfigured to support only the target channels. Alternatively, the new access points are initially activated in a mode which supports only a subset of the target channels and at a selected time reconfigured to support only the target channels. A remote network manager may be employed to remotely monitor, reconfigure, and trigger activation and deactivation of access points in support of the technique. New access points adapted to respond to inputs from the remote network manager further facilitate the invention. For example, the new access points may be remotely configurable to activate, deactivate, support a legacy spectrum or portions thereof, support a target spectrum or portions thereof, and provide traffic load and other data to the remote network manager.

Facilitating wireless spectrum migration

A system and method for Access Point (AP) channel selection based upon a Channel Quality Index (CQI) is described. The Channel Quality Index (CQI) is a value which quantifies a transmission quality of a channel. The transmission quality is evaluated based on a combination of different types of measured interference in the channel. In one embodiment the different types of measured interference include co-channel congestion, adjacent channel interference and in-band interference. The CQI is a value derived from the measurements, and for example may be a sum of all of the measurements. Each AP of the present invention determines the CQI of potential transmission channels, and selects a channel for use which has the 'best' CQI; for example if the CQI is a sum of all measured interferences, the 'best' AP is the one with the lowest CQI

System and method for determining channel quality in a wireless network

A system and method for Access Point (AP) channel selection based upon a Channel Quality Index (CQI) is described. The Channel Quality Index (CQI) is a value which quantifies a transmission quality of a channel. The transmission quality is evaluated based on a combination of different types of measured interference in the channel. In one embodiment the different types of measured interference include co-channel congestion, adjacent channel interference and in-band interference. The CQI is a value derived from the measurements, and for example may be a sum of all of the measurements. Each AP of the present invention determines the CQI of potential transmission channels, and selects a channel for use which has the 'best' CQI; for example if the CQI is a sum of all measured interferences, the 'best' AP is the one with the lowest CQI.

Co-channel congestion method and apparatus

A port on a network device engages in auto-negotiation on a network link during a first operational state to select a transmission mode, either half duplex or full duplex. If half duplex operation is selected, the port commences half duplex operation in a second operational state. During the second operational state, the link is monitored for an error condition indicating that another network device attached to the link may not be operating in a half duplex mode. This error condition includes the occurrence of excessive collisions or late collisions. When the error condition is detected, the port commences full duplex operation in a third operational state, based on the presumption that device at the other end of the link may be configured for fixed full duplex operation. If proper operation ensues, the port remains configured for full duplex transmission. Because the presumption may be incorrect, the link is monitored during the third operational state for a second error condition indicating that transmissions by the network device may be interfering with transmissions by the other network device. Examples of the second error condition include excessive frame check sequence errors and an excessive number of abnormally truncated messages. If such a second error condition occurs, the port is disabled in a fourth operational state and the condition is reported to higher-level operating software. Repeated attempts at normal operation may follow, with further monitoring that may result in shutting down the port if normal operation cannot be achieved.

Advanced ethernet auto negotiation

A port on a network device engages in auto-negotiation on a network link during a first operational state to select a transmission mode, either half duplex or full duplex. If half duplex operation is selected, the port commences half duplex operation in a second operational state. During the second operational state, the link is monitored for an error condition indicating that another network device attached to the link may not be operating in a half duplex manner. This error condition includes the occurrence of excessive collisions or late collisions. When the error condition is detected, the port commences full duplex operation in a third operational state, based on the presumption that device at the other end of the link may be configured for fixed full duplex operation. If proper operation ensues, the port remains configured for full duplex transmission. Because the presumption may be incorrect, the link is monitored during the third operational state for a second error condition indicating that transmissions by the network device may be interfering with transmissions by the other network device. Examples of the second error condition include excessive frame check sequence errors and an excessive number of abnormally truncated messages. If such a second error condition occurs, the port is disabled in a fourth operational state and the condition is reported to higher-level operating software. Repeated attempts at normal operation may follow, with further monitoring that may result in shutting down the port if normal operation cannot be achieved.

A battery charger comprises a housing, charging means in the housing which, in use, for connection to an electrical outlet and an upper plate releasably attached to the housing, the upper plate having battery receiving means to accommodate a predetermined size battery, the housing being adapted to receive upper plates which differ in formation so as to receive batteries of different dimension.

Battery charger for batteries of differing dimensions

A holder typically for a portable telephone comprises an upper housing and a lower housing, the latter being adapted for fixing to a surface or object. The upper housing comprises a support plate upon which the telephone may be located, and a pair of movable gripper members which urge the telephone against a fixed member so as to be held firmly therebetween. The distance between the fixed member and movable gripper members may be varied according to the dimensions of the telephone which the holder is receiving, and biasing means on the movable gripper members are provided to insure that there is sufficient force to firmly hold the telephone in the holder between the movable and fixed gripper members.

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Waltham, MA, United States of America

Michael Yuen