BASE STATION, TERMINAL, RECEPTION METHOD, AND TRANSMISSION METHOD

• US 20170318411A1
• Filed: 07/18/2017
• Published: 11/02/2017
• Est. Priority Date: 07/28/2015
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Inventors: YAMAMOTO, TETSUYA, SUZUKI, HIDETOSHI, HORIUCHI, AYAKO
• Granted Patent: US 10,455,390 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/066 Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]
• CPC Class Codes: H04J 13/004 Orthogonal
• CPC Class Codes: H04J 13/18 Allocation of orthogonal codes
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/26035 Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences using different training sequence per antenna H04B7/0684; code allocation H04J13/16
• CPC Class Codes: H04L 27/2643 using symbol repetition, e.g. time domain realization of distributed FDMA
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0062 Avoidance of ingress interference, e.g. ham radio channels
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management

Abstract

A repeater generates repetition signals by repeating an uplink signal over a plurality of subframes. If the plurality of subframes do not include a transmission candidate subframe of a sounding reference signal used to measure uplink reception quality, a controller sets a first transmission format to all the plurality of subframes, and if the plurality of subframes include the transmission candidate subframe, the controller sets a second transmission format to all the plurality of subframes. A transmitter transmits the repetition signals using the set transmission format.

Claims

1. A terminal comprising:

a repeater that generates repetition signals by repeating an uplink signal over a plurality of subframes;

a controller that, if the plurality of subframes do not include a transmission candidate subframe of a sounding reference signal used to measure uplink reception quality, sets a first transmission format to all the plurality of subframes and, if the plurality of subframes include the transmission candidate subframe, sets a second transmission format to all the plurality of subframes; and

a transmitter that transmits the repetition signals using the set transmission format.

2. The terminal according to claim 1,

wherein, in each subframe to which the second transmission format is set, a signal is not mapped in a resource corresponding to a symbol of the transmission candidate subframe in which the sounding reference signal is mapped.

3. The terminal according to claim 1,

wherein each subframe includes a first slot and a second slot,

wherein the sounding reference signal is mapped in the second slot of the transmission candidate subframe, and

wherein, in the second slot of each subframe to which the second transmission format is set, a signal is not mapped in a resource corresponding to a symbol in which the sounding reference signal is mapped.

4. The terminal according to claim 3,

wherein, in the first slot of each subframe to which the second transmission format is set, a signal is not mapped in a resource corresponding to a resource of the second slot of the second transmission format in which the signal is not mapped.

5. The terminal according to claim 1,

wherein the repetition signals are spread using one of a plurality of orthogonal code sequences that are partially orthogonal to one another, and

wherein the controller punctures, in the transmission candidate subframe included in the plurality of subframes, a first symbol, in which the sounding reference signal is mapped, and a second symbol, which corresponds to, among a plurality of codes included in the orthogonal code sequence, a second code, which forms a pair with a first code corresponding to the first symbol.

6. The terminal according to claim 2,

wherein the controller inserts, in the subframes other than the transmission candidate subframe among the plurality of subframes to which the second transmission format is set, a dummy symbol to a resource with which the signal is not transmitted.

7. The terminal according to claim 1,

wherein the first transmission format is a normal physical uplink control channel format, and the second transmission format is a shortened physical uplink control channel format.

8. A base station comprising:

a controller that, if a plurality of subframes in which an uplink signal is repeated do not include a transmission candidate subframe of a sounding reference signal used to measure uplink reception quality, sets a first transmission format to all the plurality of subframes and, if the plurality of subframes include the transmission candidate subframe, sets a second transmission format to all the plurality of subframes; and

a receiver that receives the repetition signals using the set transmission format.

9. A transmission method comprising:

generating repetition signals by repeating an uplink signal over a plurality of subframes;

setting, if the plurality of subframes do not include a transmission candidate subframe of a sounding reference signal used to measure uplink reception quality, a first transmission format to all the plurality of subframes and setting, if the plurality of subframes include the transmission candidate subframe, a second transmission format to all the plurality of subframes; and

transmitting the repetition signals using the set transmission format.

10. A reception method comprising:

setting, if a plurality of subframes in which an uplink signal is repeated do not include a transmission candidate subframe of a sounding reference signal used to measure uplink reception quality, a first transmission format to all the plurality of subframes and setting, if the plurality of subframes include the transmission candidate subframe, a second transmission format to all the plurality of subframes; and

receiving the repetition signals using the set transmission format.