RADIO COMMUNICATION SYSTEM, BASE STATION APPARATUS, MOBILE TERMINAL APPARATUS AND INTERFERENCE MEASUREMENT METHOD
First Claim
1. A radio communication system comprising:
- a plurality of base station apparatuses that transmits a first reference signal for channel state measurement; and
first and second mobile terminal apparatuses that connect to one of the plurality of base station apparatuses,wherein each of the base station apparatuses is provided with a reference signal assignment section that assigns the first reference signal to a reference signal resource defined for transmission of the first reference signal, while assigning a second reference signal for interference measurement to the resource, and a notification section that notifies a first mobile terminal apparatus that supports both the first reference signal and the second reference signal of pattern information to identity an assignment pattern of the first reference signal and the second reference signal, andthe first mobile terminal apparatus is provided with a reception section that receives notified pattern information, and an interference measurement section that performs interference measurement using both the first reference signal and the second reference signal or only the second reference signal, based on the notified pattern information.
1 Assignment
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Accused Products
Abstract
To increase the number of CSI-RSs for interference measurement to improve interference measurement accuracy, a first reference signal for channel state measurement and a second reference signal for interference measurement are assigned to reference signal resources defined for transmission of the first reference signal, and a mobile terminal apparatus that supports both the first reference signal and the second reference signal is notified of pattern information to identify an assignment pattern of the first reference signal and the second reference signal. A second mobile terminal apparatus that supports the first reference signal and that does not support the second reference signal is notified of pattern information to identify an assignment pattern of the first reference signal, and of assignment information indicating that resources assigned the second reference signal are assigned a third reference signal of zero power for channel state measurement.
29 Citations
14 Claims
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1. A radio communication system comprising:
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a plurality of base station apparatuses that transmits a first reference signal for channel state measurement; and first and second mobile terminal apparatuses that connect to one of the plurality of base station apparatuses, wherein each of the base station apparatuses is provided with a reference signal assignment section that assigns the first reference signal to a reference signal resource defined for transmission of the first reference signal, while assigning a second reference signal for interference measurement to the resource, and a notification section that notifies a first mobile terminal apparatus that supports both the first reference signal and the second reference signal of pattern information to identity an assignment pattern of the first reference signal and the second reference signal, and the first mobile terminal apparatus is provided with a reception section that receives notified pattern information, and an interference measurement section that performs interference measurement using both the first reference signal and the second reference signal or only the second reference signal, based on the notified pattern information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. Abase station apparatus connected to a plurality of mobile terminal apparatuses, comprising:
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a reference signal assignment section that assigns a first reference signal for channel state measurement to a reference signal resource defined for transmission of the first reference signal, while assigning a second reference signal for interference measurement to the resource; and a notification section that notifies a mobile terminal apparatus that supports both the first reference signal and the second reference signal of pattern information to identity an assignment pattern of the first reference signal and the second reference signal.
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13. A mobile terminal apparatus connected to a base station apparatus, comprising:
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a reception section that receives pattern information of a first reference signal for channel state measurement and pattern information to identify an assignment pattern of a second reference signal for interference measurement assigned to a reference signal resource defined for transmission of the first reference signal, transmitted from the base station apparatus; and an interference measurement section that performs interference measurement using both the first reference signal and the second reference signal or only the second reference signal, based on the received pattern information.
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14. An interference measurement method comprising:
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assigning a first reference signal for channel state measurement to a reference signal resource to transmit the first reference signal, while assigning a second reference signal for interference measurement to the resource; notifying a first mobile terminal apparatus that supports both the first reference signal and the second reference signal of pattern information to identity an assignment pattern of the first reference signal and the second reference signal; in the first mobile terminal apparatus, receiving the pattern information; and performing interference measurement using both the first reference signal and the second reference signal or only the second reference signal, based on the received pattern information.
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Specification