Patent ID: 8731089
Filing Date: 2014-05-20
Classification: H04L

Abstract:
1. A radio communication system comprising: a plurality of radio base station apparatuses that have a plurality of transmitting antennas and transmit reference signals which are orthogonal to each other among the plurality of transmitting antennas; and a mobile terminal apparatus that performs simultaneous channel estimation based on the reference signals transmitted from the plurality of radio base station apparatuses, while maintaining predetermined estimation accuracy while increasing a number of radio base station apparatuses on which the mobile terminal apparatus performs the simultaneous channel estimation, while suppressing an increase in number of resource elements allocated for reference signals, the plurality of radio base station apparatuses comprising: a reference signal generation section that generates the reference signals; a priority setting section that sets priority with respect to other neighboring radio base station apparatus; an allocation number determining section that determines the number of resource elements of the reference signals allocated according to the priority, in a resource block that is a unit of allocation to a user and is used in common with the other radio base station apparatus; and an allocation section that allocates the reference signals corresponding in number to the resource elements so as to be orthogonal to those of the other radio base station apparatus, and orthogonalizing reference signals from the plurality of base stations to each other within a resource block.