# US 12,015,512 B2 · Communication apparatus and transmission method for transmitting a demodulation reference signal

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- Number: US 12,015,512 B2
- Document ID: US12015512B2
- Status: Granted
- Kind: B2
- Application number: 18/302,584
- Filed: 2023-04-18
- Published: 2023-08-10
- Granted: 2024-06-18
- Earliest claimed: 2016-02-05
- Assignees: Panasonic Intellectual Property Corporation of America
- Applicants: Panasonic Intellectual Property Corporation of America
- Inventors: Tetsuya Yamamoto; Ayako Horiuchi
- Web page: https://patentgrep.com/patent/US12015512B2

## CPC

- H04L 27/26132: {using repetition}
- H04L 1/0003: {by switching between different modulation schemes}
- H04L 1/0013: {Rate matching, e.g. puncturing or repetition of code symbols}
- H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)}
- H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)}
- 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 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L 25/0224: {using sounding signals}
- H04L 25/0228: {with direct estimation from sounding signals}
- H04L 27/26: Systems using multi-frequency codes (H04L27/32 takes precedence)
- H04L 27/2607: {Cyclic extensions}
- H04L 27/2613: {Structure of the reference signals}
- H04L 27/2626: {Arrangements specific to the transmitter only}
- H04W 72/04: Wireless resource allocation
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/20: Control channels or signalling for resource management
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals}
- H04L 27/2636: {with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]}
- 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

A repetition unit (212) performs a repetition for mapping a data signal and a demodulation reference signal (DMRS) repeatedly at a symbol level over a plurality of subframes. A signal allocation unit (213) maps, in the a plurality of subframes, the repeated DMRS to symbols other than symbols corresponding to an SRS resource candidate, which is a candidate for a resource to which a sounding reference signal (SRS) to be used to measure an uplink received signal quality is to be mapped. A transmission unit (216) transmits an uplink signal (PUSCH) including the DMRS and the data signal over the a plurality of subframes.

## Claims

### Claim 1

An integrated circuit, comprising:
reception circuitry, which, in operation, controls receiving control information indicating a number of symbols on which a Demodulation Reference Signal (DMRS) is to be mapped; and
transmission circuitry, which, in operation, controls transmitting a signal in a multiple consecutive time units, each of the multiple consecutive time units including multiple time slots;
wherein the DMRS is mapped to each of multiple non-consecutive sets in the multiple consecutive time units, a number of symbols in each of the multiple non-consecutive sets being determined based on the control information,
the number of symbols of each of the multiple non-consecutive sets is less than 14 symbols regardless of a number of the multiple consecutive time units,
the symbols of each of the multiple non-consecutive sets are symbols other than sounding reference signal (SRS) symbol candidates, and
a number of the multiple consecutive time units is different for each of numbers of subcarriers to be mapped.

### Claim 2 (depends on 1)

The integrated circuit according to claim 1, wherein each of the multiple non-consecutive sets is periodically allocated in multiple consecutive time units.

### Claim 3 (depends on 1)

The integrated circuit according to claim 1, wherein the SRS symbol candidates is transmitted via a higher layer signaling.

### Claim 4 (depends on 1)

The integrated circuit according to claim 1, wherein the numbers of subcarriers include less than 12 subcarriers.

### Claim 5 (depends on 1)

The integrated circuit according to claim 1, wherein the signal is generated without assuming the SRS symbol candidates, and some of the signal relating to the SRS symbol candidates is punctured before transmission.

### Claim 6 (depends on 1)

The integrated circuit according to claim 1, wherein a total number of symbols in the multiple non-consecutive sets is determined based on a repetition number of a physical shared uplink channel (PUSCH) and a number of subframes per a resource unit.