BASE STATION APPARATUS, TERMINAL APPARATUS, AND COMMUNICATION METHOD THEREOF

• US 20190327030A1
• Filed: 04/28/2017
• Published: 10/24/2019
• Est. Priority Date: 06/27/2016
• Status: Active Grant

• Current Assignee: FG Innovation Company Limited, Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: YOSHIMOTO, Takashi, GOTO, Jungo, NAKAMURA, Osamu, HAMAGUCHI, Yasuhiro
• Granted Patent: US 10,972,224 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 1/1614 using bitmaps
• CPC Class Codes: H04L 1/1858 Transmission or retransmission of more than one copy of acknowledgement message
• CPC Class Codes: H04W 28/04 Error control

Abstract

To provide a base station apparatus, a terminal apparatus, and a communication method capable of efficiently performing retransmission control for small size data in grant-free multiple access where the base station apparatus accommodates a large number of terminal apparatuses. The base station apparatus for communicating with multiple terminal apparatuses, the base station apparatus including a receiver configured to receive an identification signal identifying a terminal apparatus having transmitted uplink data and the uplink data, and a transmitter configured to transmit a delivery confirmation signal for the uplink data, wherein the delivery confirmation signal includes a bundled delivery confirmation signal for the uplink data received on an identical time resource and an identical frequency resource, and a delivery confirmation signal for each terminal apparatus, the bundled delivery confirmation signal is associated with a parameter shared by the terminal apparatuses having transmitted the uplink data received on the identical time resource and the identical frequency resource, and the delivery confirmation signal for each terminal apparatus is associated with a parameter specific to the terminal apparatus.

Claims

1. A base station apparatus for communicating with multiple terminal apparatuses, the base station apparatus comprising:

a receiver configured to receive an identification signal identifying each terminal apparatus having transmitted uplink data and the uplink data; and

a transmitter to transmit a signal indicating a delivery confirmation for the uplink data, wherein

the signal indicating the delivery confirmation includes a signal indicating a bundled delivery confirmation for the uplink data received on an identical time resource and an identical frequency resource, and a signal indicating a delivery confirmation for each terminal apparatus,

the signal indicating the bundled delivery confirmation is associated with a parameter shared by the terminal apparatuses having transmitted the uplink data received on the identical time resource and the identical frequency resource, and

the signal indicating the delivery confirmation for each terminal apparatus is associated with a parameter specific to the terminal apparatus.

2. The base station apparatus according to claim 1, wherein

the transmitter multiplies the signal indicating the bundled delivery confirmation by a sequence generated using the parameter shared by the terminal apparatuses, and adds a cyclic redundancy check scrambled with the parameter specific to the terminal apparatus to the signal indicating the delivery confirmation for each terminal apparatus.

3. The base station apparatus according to claim 1, wherein

the parameter specific to the terminal apparatus includes a sequence of the identification signal.

4. The base station apparatus according to claim 1, wherein

the parameter specific to the terminal apparatus includes a cyclic shift amount applied to the sequence of the identification signal.

5. The base station apparatus according to claim 1, wherein

the parameter shared by the terminal apparatuses includes a subframe number that the identification signal has been transmitted.

6. The base station apparatus according to claim 1, wherein

the parameter shared by the terminal apparatuses includes a subframe number that the uplink data has been transmitted.

7. A terminal apparatus for communicating with a base station apparatus, the terminal apparatus comprising:

a transmitter configured to transmit an identification signal indicating that the terminal apparatus itself transmits uplink data and the uplink data; and

a receiver configured to receive a signal indicating a delivery confirmation for the uplink data, wherein

the receiver tries to receive the signal indicating the delivery confirmation through despread processing using a sequence of the identification signal and descramble processing using a sequence generated using a subframe number that the identification signal sequence or the uplink data has been transmitted.

8. The terminal apparatus according to claim 7, wherein

in a case that the receiver receives a delivery confirmation signal including a negative acknowledgement through the despread processing using the identification signal sequence, the transmitter retransmits data bits and parity bits constituting the uplink data.

9. (canceled)

10. (canceled)

11. A terminal apparatus for performing grant-free communication with a base station apparatus, the terminal apparatus comprising:

a transmitter configured to transmit uplink data; and

a receiver configured to receive information indicating a retransmission timing of the uplink data and a signal indicating a delivery confirmation for the uplink data, wherein

the information indicating the retransmission timing includes multiple transmission intervals for retransmission, and

in a case that the signal indicating the delivery confirmation is a delivery confirmation indicating a negative acknowledgement, the transmitter retransmits the uplink data based on a transmission interval selected from the multiple transmission intervals.

12. The terminal apparatus according to claim 11, wherein

the information indicating the retransmission timing includes a reference time and offset values for the reference time,

the offset values include multiple transmission intervals for the reference time, and

in the case that the signal indicating the delivery confirmation is the delivery confirmation indicating the negative acknowledgement, the transmitter retransmits the uplink data based on a transmission interval selected from the multiple transmission intervals included in the offset values.

13. The terminal apparatus according to claim 12, wherein

a range of the offset values included in the information indicating the retransmission timing is increased as the number of retransmissions increases.

14. The terminal apparatus according to claim 12, wherein

the signal indicating the delivery confirmation includes a delivery confirmation indicating a first negative acknowledgement associated with a parameter specific to the terminal apparatus, and a delivery confirmation including a second negative acknowledgement associated with a parameter shared by the terminal apparatuses which are identified with an identical time resource and an identical frequency resource, and

in a case that the transmitter receives the delivery confirmation signal including the second negative acknowledgement, the transmitter retransmits the uplink data based on a transmission interval selected from the multiple transmission intervals included in the offset values.

15. (canceled)

16. (canceled)

17. (canceled)

18. (canceled)