Patent ID: 8477754
Filing Date: 2013-07-02
Classification: H04B,H04W

Abstract:
1. A wireless communication apparatus for tracking mobile stations that are moving at high speed and for suppressing interference when transmitting signals to and receiving signals from N mobile stations, with N being a natural number greater than 2 or equal to 2, said apparatus comprising: at the reception side, moving speed estimating means for estimating a moving speed of each mobile station based on M reception signals each received by the corresponding antenna, M being a natural number greater than 2 or equal to 2; directivity determining means for determining an antenna directivity for each mobile station based on said M reception signals and the moving speeds estimated by said moving speed estimating means; signal separating means for separating said M reception signals into signal components that have been transmitted from respective mobile stations, based on the directivities that have been determined by said directivity determining means; and signal recovering means for recovering transmission signals from respective mobile stations based on the respective signal components that have been separated by said signal separation means; at the transmission side, resource assigning means for determining radio resource assignments; said resource assigning means assigns at least one of frequencies and time slots to said respective mobile stations based on a service quality signal indicative of the service quality of the mobile stations and the moving speeds estimated by said moving speed estimating means to suppress interference between mobile stations; transmission signal generating means for generating N trans-mission signals based on N transmission information, the directivities that have been determined by said directivity determining means, and the resource assignments that have been determined by said resource assigning means; and transmission signal multiplexing means for multiplexing said N transmission signals that have been generated by said transmission signal generating means, using the resource assignments that have been determined by said resource assigning means, and outputting the multiplexed transmission signal, said directivity determining means determines directivity with a wide beam width for mobile stations that are moving at a high speed, estimated by said directivity deciding means, and determines directivity with a narrow beam width for mobile stations that are moving at a low speed, estimated by said directivity deciding means, where the directivity with the narrow beam width is determined in order to increase a tracking capability, wherein said resource assigning means classifies said moving speeds into L moving speed classes, L being an arbitrary natural number, and assigns different radio resources to said moving speed classes based on an assignment policy that said resource assigning means of other wireless communication apparatuses use to assign radio resources.