A wireless data communications system has mobile units which become associated with access points. Association between a mobile unit and an access point is changed as mobile units move within an area having a plurality of access points. Selection of an access point for association with a mobile unit is made according to selection criteria including a plurality of selection parameters. The system includes arrangements for determining location of a mobile unit within the area. The selection parame...

A system for positioning a wireless LAN device includes a client device for transmitting a positioning request, the positioning request identifying a wireless LAN device, a location server for receiving the request, and a backbone network for requesting a position from the wireless LAN device and receiving position information from the wireless LAN device, wherein the backbone network transmits the position information to the location server, and wherein the location server determines positionin...

A method in a wireless communications network is disclosed whereby errors due to incorrect transmission of scrambler seed values can be very greatly reduced. This is achieved by using a known pseudo-random seed generating algorithm at both at least one transmitting device 1 that has an associated transmitting address and at least one receiving device 2 that has at least one associated receiving address, it is possible to reduce errors due to incorrectly transmitted scrambler seed values.

The present invention consists of a device-internal data flow organization coupled with a wireless communications medium access control protocol for a set of WLAN "Multiprotocol Devices", each containing a 2.4 and 5 GHz frequency band-agile CCK and OFDM modulation capable radio, such that the devices may support simultaneous 802.11a and 802.11b/g-compliant Access Point functionality. The set includes a "Multiprotocol Access Point" that bridges communications from 802.11a and/or 802.11b/g complia...

An antenna system comprises first, second, and third antennas that are arranged on a printed circuit board (PCB) and that include an inner ring and an outer ring that is concentric to said inner ring.

A first network is structured according to a first technology, especially a data network, comprising one or several network devices and/or interfaces, which are configured to establish communication with at least one station using the first technology and have basic functions for autonomous operation of the first network. In order to be able to collect subscriber-related data from a data source outside the network, especially a second network structured according to a second technology, more par...

A method of handover between two WLAN cells based on the IEEE 802.11 standard and working at two different frequencies, the method including the step of performing measurement(s) on the second frequency in order to verify the necessity or the opportunity to realise a handover, the first frequency being currently used to transmit data, the method characterised in that it involves: first sending at least one dummy data or control frame on the first frequency which is currently used for transmittin...

A method for controlling cell size associated with an access point that has a receive sensitivity and an output power. The method includes changing a start of packet threshold and/or a clear channel assessment threshold to vary the cell size of the access point.

A channel estimator for use in wireless local area networks (WLAN's), characterized in that a channel estimation controller with a simplified recursive least square (RLS) algorithm and a data-reconstructor are employed to adjust the channel response in frequency domain during the delivery of a signal packet. Such adjustment is adaptively performed at anytime during the delivery of a signal packet so as to achieve fast convergence as well as accurate channel estimation.

A WLAN (Wireless Local Area Network) receiver is provided that has a power normalization unit that receives an input signal having a signal power within a given power range. The power normalization unit outputs a signal that is derived from the input signal by applying one of at least two different power normalization functions to the input signal. The power normalization unit comprises a power determination unit for determining the signal power, and a function selection unit for determining one...