Patent ID: 9356754
Filing Date: 2016-05-31
CPC Classification: H04L,H04W

Claim Text:
1. A radio communication system comprising a plurality of base station apparatuses that transmit a first reference signal for channel state measurement, and a first mobile terminal apparatus and a second mobile terminal apparatus that each connects with one of the plurality of base station apparatuses, wherein: each base station apparatus comprises a reference signal allocation section that allocates the first reference signal to a first resource element in a reference signal resource defined for transmission of the first reference signal and also allocates a second reference signal for interference measurement to a second resource element in the reference signal resource, and implicitly reports allocation patterns of the first reference signal and the second reference signal to the first mobile terminal apparatus that supports both the first reference signal and the second reference signal; and each mobile terminal apparatus comprises an interference measurement section that measures interference using both the first reference signal and the second reference signal or using the second reference signal alone, based on the allocation patterns reported implicitly from the base station apparatus, wherein the reference signal allocation section allocates, as the second reference signal, a reference signal for both channel state measurement and interference measurement to the second resource element, based on the allocation pattern of the first reference signal that the second mobile terminal apparatus supports, and the first mobile terminal apparatus measures channel states and interference using the second reference signal.