Abstract: A system and method for allowing mobile devices to simultaneously access a Subscriber Identity Module (SIM) are disclosed. The SIM contains a wireless transceiver, and the SIM may be located within a mobile phone, or it may be a stand-alone device. The mobile devices use a wireless protocol, such as Bluetooth, to retrieve identification information from the SIM. The devices then use this identification information to connect to a wireless communications network, such as a wireless local area network. Through this network the devices will be able to access the Internet. The SIM will never need to be removed and inserted from one device to another, and multiple devices can use the SIM simultaneously. Thus, the mobile phone will work regardless of whether other devices are also using the SIM.

Abstract: Sensors mounted on vehicles (e.g., buses, taxis, police cars) and public personnel (e.g., policemen) are used to monitor various conditions and situations such as air quality, potential biological and chemical attacks, and road and traffic conditions. The invention improves upon the typical approach that deploys fixed sensors at every geographical position of interest. The total number of required sensors and the size and the complexity of the network infrastructure required to connect the sensors are reduced and simplified. A method for estimating the number of mobile sensors required to cover a region of interest also is disclosed. A relatively small number of mobile sensors may be sufficient to cover a large area at a lower cost and less complexity than a fixed sensor network.

Abstract: A helper station system is disclosed that can enhance communications in a wireless network having at least one slow or unreliable link. In preferred embodiments, the helper station system includes at least one helper station configured to wirelessly re-transmit an original wireless transmission from at least one sender station to at least one access point without having to re-contend for access to the wireless medium.

Abstract: The present application discloses, inter alia, a system for improving the aggregate throughput of a wireless local area network which includes: at least one access point that is equipped with at least one transceiver configured to simultaneously transmit and receive at multiple frequencies using multiple channels; and the access point being configured to acquire channel conditions of users and to pool sets of users on the channels based on the channel conditions.

Abstract: According to some of the preferred embodiments, a method for proactively establishing a security association between a mobile node in a visiting network and an authentication agent in another network to which the mobile node can move includes: negotiating pre-authentication using a flag in a message header that indicates whether the communication is for establishing a pre-authentication security association; and one of the mobile node and the authentication agent initiating pre-authentication by transmitting a message with the flag set in its message header, and the other of the mobile node and the authentication agent responding with the flag set in its message header only if it supports the pre-authentication.