Abstract: A communication apparatus includes a radio portion (100) configured to transmit a modulated transmission signal and to receive a modulated reception signal.

Abstract: There are a step in which, when the video data distribution request is received from the mobile station, the base station determines whether the requested video data can be distributed or not, on the basis of the wireless transmission capacity required for distributing the requested video data and the wireless transmission capacity that is available at that point of time, a step in which the base station notifies the mobile station of a result of possibility determination about distribution, a step in which, when it is determined that distribution cannot be performed, the base station sends an inquiry about a base station capable of performing distribution, to the transmitted-data capacity management device, a step in which the transmitted-data capacity management device selects base stations capable of performing the distribution, on the basis of the wireless transmission capacity required for distributing the video data and the wireless transmission capacity being used for distribution performed by a plural

Abstract: A video data providing unit (10) connects to a restricted access providing-side VPN (20). A streaming server (60) connects to a restricted access transmitting-side VPN (50). A router (40) determines whether or not transmitting-side data such as request data or instruction data received via the transmitting-side VPN (50) is data that has been transmitted from the streaming server (60), and whether or not providing-side data such as video data received via the providing-side VPN (20) is data that has been transmitted from the information providing unit (10). The router 40 then transfers the transmitting-side data and providing-side data based on those determination results.

Abstract: A radio network controller comprises a cell selector configured to select a cell to use by a mobile station after data reception, and a mobile station controller configured to control the mobile station to communicate by radio using the cell selected by the cell selector after the data reception.

Abstract: The transmission system of the present invention is designed to transmit a plurality of signals between the transmitter and the receiver using a plurality of carriers and comprises a radio link characteristics estimator 4 configured to estimate the characteristics of a radio link between the transmitter and the receiver and a carrier quantity determination unit 3 configured to determine the number of carriers according to the result of the estimate by the radio link characteristics estimator 4. The radio link characteristics estimator 4 estimates the characteristics according to an interval in delay time of multipath signals and the number of the multipath signals. The carrier quantity determination unit 3 determines fewer carriers when multipath interference is small, and determines more carriers when the multipath interference is great.

Abstract: A location managing method for managing a location of a mobile station in a mobile wireless packet communication system in which each of communication nodes down to a base station have a hierarchical structure, wherein a route from a communication node positioned at a highest layer of the hierarchical structure to a base station of a cell in which a mobile station is located, is managed as location information of the mobile station, by being distributed to the communication node located at the highest layer of the hierarchical structure and to each of communication nodes in the route to the base station.