# US 12,191,946 B2 · Transmission device, receiving device, transmission method, and receiving method

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- Number: US 12,191,946 B2
- Document ID: US12191946B2
- Status: Granted
- Kind: B2
- Application number: 18/477,223
- Filed: 2023-09-28
- Published: 2024-01-25
- Granted: 2025-01-07
- Earliest claimed: 2012-03-19
- Assignees: Panasonic Intellectual Property Corporation of America
- Applicants: Panasonic Intellectual Property Corporation of America
- Inventors: Tadashi Yoshida; Ayako Horiuchi; Takashi Iwai; Yoshihiko Ogawa; Akihiko Nishio
- Web page: https://patentgrep.com/patent/US12191946B2

## CPC

- H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]}
- H04B 7/068: {using space frequency diversity (space-frequency coding H04L1/0606)}
- H04B 7/0689: {using different transmission schemes, at least one of them being a diversity transmission scheme}
- H04B 7/0691: {using subgroups of transmit antennas}
- H04B 7/0871: {using different reception schemes, at least one of them being a diversity reception scheme}
- H04B 7/0874: {using subgroups of receive antennas}
- H04J 11/00: Orthogonal multiplex systems, {e.g. using WALSH codes}(H04J13/00 takes precedence)
- H04J 13/00: Code division multiplex systems (for frequency hopping H04B1/713)
- H04J 13/0003: {Code application, i.e. aspects relating to how codes are applied to form multiplexed channels}
- H04L 5/0023: {Time-frequency-space}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04W 72/04: Wireless resource allocation
- 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)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

This invention is a transmission device capable of enhancing the reception characteristics of a terminal when employing transmit diversity using two antenna ports in an ePDCCH. In a base station (100) that transmits a reference signal to a terminal (200) using two antenna ports, a setting unit (102), on the basis of the reception quality of the terminal, sets as the aforementioned two antenna ports either a first antenna port pair for which DMRS (reference signals) do not undergo mutual code multiplexing, or a second antenna port pair for which the DMRS do undergo code multiplexing. A transmitter (109) transmits the DMRS from the two antenna ports set in the setting unit (102).

## Claims

### Claim 1

An integrated circuit, comprising:
determination circuitry, which, in operation, controls determining one or more antenna ports used for transmission of reference signals; and
transmission circuitry, which, in operation, controls transmitting downlink control information including Demodulation Reference Signal (DMRS) antenna port information indicating the one or more antenna ports,
wherein the one or more antenna ports are selected from a plurality of candidates including a first antenna port pair, a second antenna port pair, and a single antenna port,
wherein the first antenna port pair is an antenna port pair in which reference signals of a first antenna port and a second antenna port are assigned in different resource elements and power boosting is applied to the reference signals, the second antenna port pair is an antenna port pair in which the reference signals of the first antenna port and a third antenna port are assigned in same resource elements and power boosting is not applied to the reference signals, and the single antenna port is the second antenna port.

### Claim 2 (depends on 1)

The integrated circuit according to claim 1, wherein the reference signals are transmitted from the base station.

### Claim 3 (depends on 1)

The integrated circuit according to claim 1, wherein the one or more antenna ports used for the transmission of reference signals are different among component carriers.

### Claim 4 (depends on 1)

The integrated circuit according to claim 1, wherein the one or more antenna ports are selected from at most four antenna ports.

### Claim 5 (depends on 1)

The integrated circuit according to claim 1, wherein the reference signals are demodulation reference signals (DMRSs).