Radio reception apparatus, radio transmission apparatus, and radio communication method
First Claim
1. An integrated circuit for controlling a process, the process comprising:
- mapping, in at least one mode of operation, a first reference signal for a first communication system in a plurality of symbols of both a former half and a latter half, the plurality of symbols being divided in the former half and the latter half according to a time direction of which a subframe is comprised;
mapping, in the at least one mode of operation, a second reference signal for a second communication system to only a last two symbols in the latter half of the plurality of symbols, andtransmitting the first reference signal and the second reference signal,wherein the first reference signal is a Long Term Evolution (LTE) reference signal and the second reference signal is an LTE-Advanced reference signal.
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Accused Products
Abstract
Where first and second reference signals for a first and second communication system, respectively, are transmitted, resources that affect a reception apparatus compatible only with the first communication system can be minimized, and the throughput can be prevented from being deteriorated. As resources for a reference signal CSI-RS for LTE-A, last half symbols in a time direction of a resource unit RB/Sub-frame defined in a frequency-time domain are used, and the CSI-RS is allocated in a position up to the last two symbols or in the last symbol, or the like, of a particular RB/Sub-frame and transmitted when a reference signal 4RS for LTE is transmitted to a reception apparatus in addition to transmitting CSI-RS for LTE-A. The reception apparatus receives CSI-RS allocated in the last half symbol of RB/Sub-frame based on CSI-RS allocation information, measures channel quality by using this CSI-RS, and transmits and reports feedback information.
27 Citations
28 Claims
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1. An integrated circuit for controlling a process, the process comprising:
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mapping, in at least one mode of operation, a first reference signal for a first communication system in a plurality of symbols of both a former half and a latter half, the plurality of symbols being divided in the former half and the latter half according to a time direction of which a subframe is comprised; mapping, in the at least one mode of operation, a second reference signal for a second communication system to only a last two symbols in the latter half of the plurality of symbols, and transmitting the first reference signal and the second reference signal, wherein the first reference signal is a Long Term Evolution (LTE) reference signal and the second reference signal is an LTE-Advanced reference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An integrated circuit comprising circuitry, which, in operation:
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controls, in at least one mode of operation mapping of a first reference signal for a first communication system in a plurality of symbols of both a former half and a latter half, the plurality of symbols being divided in the former half and the latter half according to a time direction of which a subframe is comprised; controls, in the at least one mode of operation, mapping of a second reference signal for a second communication system to only a last two symbols in the latter half of the plurality of symbols, and controls transmission of the first reference signal and the second reference signal, wherein the first reference signal is a Long Term Evolution (LTE) reference signal and the second reference signal is an LTE-Advanced reference signal. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification