Base station apparatus, terminal apparatus, and communication method for performing a retransmission control of uplink data in grant free multiple access

• US 10,735,136 B2
• Filed: 06/22/2017
• Issued: 08/04/2020
• Est. Priority Date: 07/05/2016
• Status: Active Grant

• Current Assignee: 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
• Primary Examiner(s): Knapp, Justin R
• Application Number:
  US16/313,097
• Publication Number:
  US 20190229843A1
• Time in Patent Office: 1,139 Days
• Field of Search: None
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• 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 1/1614 using bitmaps
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 72/0466 the resource being a scrambling code
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

Provided are a base station apparatus, a terminal apparatus and a communication method, capable of an efficient retransmission control of uplink data of which a resource for transmission is not discerned in grant-free multiple access. A terminal apparatus configured to communicate with a base station apparatus includes a transmitter configured to transmit an identifying signal indicating that the terminal apparatus itself transmits an uplink data channel and the uplink data channel. The uplink data channel includes an uplink data bit, a bit representing an identifier of the terminal apparatus, a first error detection bit generated from the uplink data bit, and a second error detection bit generated from the identifier of the terminal apparatus. The first error detection bit is scrambled using the identifier of the terminal apparatus, and the second error detection bit is scrambled using the identifying signal.

Claims

1. A terminal apparatus configured to communicate with a base station apparatus,

the terminal apparatus comprising:

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

a receiver configured to receive a signal indicating delivery acknowledgement for the uplink data channel,

wherein the uplink data channel includes an uplink data bit, a bit representing an identifier of the terminal apparatus itself, a first error detection bit generated from the uplink data bit, and a second error detection bit generated from the identifier of the terminal apparatus itself, and

the first error detection bit is scrambled using the identifier of the terminal apparatus, and the second error detection bit is scrambled using the identifying signal.

2. The terminal apparatus according to claim 1,

wherein the receiver is configured to descramble the signal indicating the delivery acknowledgement using a sequence associated with the identifier of the terminal apparatus.

3. The terminal apparatus according to claim 1,

wherein the receiver is configured to descramble the signal indicating the delivery acknowledgement using a sequence associated with the identifying signal.

4. The terminal apparatus according to claim 1,

wherein the receiver is configured to descramble the signal indicating the delivery acknowledgement using a sequence associated with a subframe number of a subframe at which the uplink data channel is transmitted.

5. The terminal apparatus according to claim 1,

wherein the receiver is configured to descramble the signal indicating the delivery acknowledgement using a sequence associated with a subframe number of a subframe at which the identifying signal is transmitted.

6. The terminal apparatus according to claim 1,

wherein the base station apparatus is configured to interpret that the base station apparatus fails to identify a terminal in a case that the receiver could not receive the signal indicating the delivery acknowledgement for the uplink data channel using an identifier applied on the first error detection bit.

7. The terminal apparatus according to claim 1,

wherein the terminal apparatus is configured to assume that the terminal apparatus itself is not identified by the base station apparatus in a case that the receiver does not receive the signal indicating the delivery acknowledgement for the uplink data channel by a receive timing of a signal indicating transmission acknowledgement.

8. A base station apparatus configured to communicate with a terminal apparatus,

the base station apparatus comprising:

a receiver configured to receive an identifying signal for identifying a terminal apparatus that transmits an uplink data channel and the uplink data channel; and

a higher layer processing unit configured to perform error detection using a first error detection bit and a second error detection bit included in the uplink data channel,

wherein the receiver is configured to perform descrambling processing for the first error detection bit using the identifying signal and to perform descrambling processing for the second error detection bit using an identifier of the terminal apparatus used for generating the first error detection bit.

9. The base station apparatus according to claim 8, further comprising:

a transmitter configured to transmit a signal indicating delivery acknowledgement for the uplink data channel,

wherein the transmitter is configured to scramble the signal indicating the delivery acknowledgement using a sequence associated with the identifier of the terminal apparatus.

10. The base station apparatus according to claim 9,

wherein in a case that an error is detected with a first error detection bit, the transmitter is configured to scramble the signal indicating the delivery acknowledgement using the sequence associated with the identifier of the terminal apparatus.

11. The base station apparatus according to claim 8, further comprising:

a transmitter configured to transmit a signal indicating delivery acknowledgement for the uplink data channel,

wherein the transmitter is configured to scramble the signal indicating the delivery acknowledgement using a sequence associated with the identifying signal.

12. The base station apparatus according to claim 11,

wherein in a case that an error is detected with a second error detection bit, the transmitter is configured to scramble the signal indicating the delivery acknowledgement using the sequence associated with the identifying signal.

13. A method of communication used in a terminal apparatus for communicating with a base station apparatus, the method comprising the steps of:

transmitting an identifying signal indicating that the terminal apparatus itself transmits an uplink data channel and the uplink data channel; and

receiving a signal indicating delivery acknowledgement for the uplink data channel

wherein the uplink data channel includes an uplink data bit, a bit representing an identifier of the terminal apparatus, a first error detection bit generated from the uplink data bit, and a second error detection bit generated from the identifier of the terminal apparatus, and

the first error detection bit is scrambled using the identifier of the terminal apparatus, and the second error detection bit is scrambled using the identifying signal.

14. A method of communication used in a base station apparatus for communicating with a terminal apparatus, the method comprising the steps of:

receiving an identifying signal for identifying a terminal apparatus that transmits an uplink data channel and the uplink data channel; and

performing error detection using a first error detection bit and a second error detection bit included in the uplink data channel,

wherein in the step of performing error detection, descrambling processing is performed for the first error detection bit using the identifying signal, and descrambling processing is performed for the second error detection bit using an identifier of the terminal apparatus used for generating the first error detection bit.