# US 2019/0246352 A1 · Wireless communication device and wireless communication method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0246352 A1 - Document ID: US20190246352A1 - Status: Published application - Kind: A1 - Application number: 16/388,072 - Filed: 2019-04-18 - Published: 2019-08-08 - Earliest claimed: 2010-06-16 - Assignees: Sun Patent Trust - Applicants: Sun Patent Trust - Inventors: Atsushi Sumasu; Daichi Imamura; Ayako Horiuchi; Yasuaki Yuda - Web page: https://patentgrep.com/patent/US20190246352A1 ## CPC - H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame} - H04B 17/309: Measuring or estimating channel quality parameters - H04J 11/005: {of intercell interference} - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04L 12/18: for broadcast or conference {, e.g. multicast} - H04L 12/189: {in combination with wireless systems (selective distribution or broadcast in wireless communication networks H04W4/06)} - H04L 27/12: Modulator circuits; Transmitter circuits - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 52/0206: {in access points, e.g. base stations} - H04W 72/30: Resource management for broadcast services - H04J 11/0053: {using co-ordinated multipoint transmission/reception (co-ordinated antenna or beam-forming aspects H04B7/022)} - H04J 11/0056: {Inter-base station aspects} - Y02D 30/70: in wireless communication networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract The transmission of a reference signal, such as a CSI-RS, is enabled while maintaining a power saving effect when performing inter-cell cooperative transmission/reception or the like in a plurality of cells. In order to realize inter-cell cooperative transmission/reception, a CSI-RS which is used for estimating the state of a spatial propagation path of a communication line is generated by a CSI-RS generation unit, and the CSI-RS is disposed in a predetermined subframe by a disposition unit and transmitted. At this time, when a frame has ten subframes #0 to #9, the CSI-RS is disposed in the subframes #4 and #9, which are subframes excluding the subframes #0 and #5 incapable of transmitting a CSI-RS and are subframes other than subframes capable of acting as MBSFN subframes when discontinuous communication (Extended Cell DTX) is performed so as to achieve power saving, and transmitted. ## Claims ### Claim 1 A communication apparatus comprising: a receiver which, in operation, receives a downlink signal including a Channel State Information (CSI) reference signal mapped in a subframe other than subframes configured to be used for Multimedia Broadcast multicast service Single Frequency Network (MBSFN) transmission, the subframes including at least one subframe actually used for the MBSFN transmission and another subframe reserved for the MBSFN transmission; and a transmitter which, in operation, transmits Channel Quality Indicator (CQI) information, the CQI information being estimated using the CSI reference signal. ### Claim 2 (depends on 1) The communication apparatus according to claim 1, wherein the CSI reference signal is mapped by multiplexing the CSI reference signal on a frequency region at at least one Orthogonal Frequency Division Multiplexing (OFDM) symbol. ### Claim 3 (depends on 1) The communication apparatus according to claim 1, wherein the CSI reference signal is mapped by multiplexing the CSI reference signal on a part of a plurality of subcarriers of at least one Orthogonal Frequency Division Multiplexing (OFDM) symbol. ### Claim 4 (depends on 1) The communication apparatus according to claim 1, wherein the CSI reference signal is mapped by using two or more Orthogonal Frequency Division Multiplexing (OFDM) symbols and by multiplexing the CSI reference signal on a frequency region and a time region. ### Claim 5 (depends on 1) The communication apparatus according to claim 1, wherein in the subframe to which the CSI reference signal is mapped, a number of symbols on which the CSI reference signal is mapped is smaller than a number of symbols on which a cell-specific reference signal (CRS) is mapped. ### Claim 6 A communication method comprising: receiving a downlink signal including a Channel State Information (CSI) reference signal mapped in a subframe other than subframes configured to be used for Multimedia Broadcast multicast service Single Frequency Network (MBSFN) transmission, the subframes including at least one subframe actually used for the MBSFN transmission and another subframe reserved for the MBSFN transmission; and transmitting Channel Quality Indicator (CQI) information, the CQI information being estimated using the CSI reference signal. ### Claim 7 (depends on 6) The communication method according to claim 6, wherein the CSI reference signal is mapped by multiplexing the CSI reference signal on a frequency region at at least one Orthogonal Frequency Division Multiplexing (OFDM) symbol. ### Claim 8 (depends on 6) The communication method according to claim 6, wherein the CSI reference signal is mapped by multiplexing the CSI reference signal on a part of a plurality of subcarriers of at least one Orthogonal Frequency Division Multiplexing (OFDM) symbol. ### Claim 9 (depends on 6) The communication method according to claim 6, wherein the CSI reference signal is mapped by using two or more Orthogonal Frequency Division Multiplexing (OFDM) symbols and by multiplexing the CSI reference signal on a frequency region and a time region. ### Claim 10 (depends on 6) The communication method according to claim 6, wherein in the subframe to which the CSI reference signal is mapped, a number of symbols on which the CSI reference signal is mapped is smaller than a number of symbols on which a cell-specific reference signal (CRS) is mapped.