Method and system for dynamic ACK/NACK repetition for robust downlink MAC PDU transmission in LTE

• US 10,020,925 B2
• Filed: 01/29/2015
• Issued: 07/10/2018
• Est. Priority Date: 06/18/2007
• Status: Active Grant

• Current Assignee: Blackberry Limited
• Original Assignee: Blackberry Limited
• Inventors: Suzuki, Takashi, Cai, Zhijun, Womack, James Earl
• Primary Examiner(s): Jain, Raj
• Assistant Examiner(s): Lee, Andrew C
• Application Number:
  US14/608,441
• Publication Number:
  US 20150180637A1
• Time in Patent Office: 1,258 Days
• Field of Search: 370329
• CPC Class Codes: H04L 1/1858 Transmission or retransmission of more than one copy of acknowledgement message
• CPC Class Codes: H04L 2001/125 Arrangements for preventing errors in the return channel
• CPC Class Codes: H04L 5/0005 Time-frequency
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04W 28/04 Error control

Abstract

A method and apparatus for dynamic acknowledgement repetition for a downlink medium access control packet data unit transmission ‘MAC PDU’ requiring multiple acknowledgements, the method having the steps of: receiving the downlink MAC PDU requiring multiple acknowledgements; and utilizing a differentiating factor and acknowledgement scheme, sending the multiple acknowledgements.

Claims

1. A method performed by a user equipment to provide acknowledgement (ACK) or negative acknowledgement (NACK) feedback regarding a downlink transmission, the method comprising:

upon receipt of the downlink transmission;

transmitting, by the user equipment, a first ACK/NACK feedback response corresponding to the downlink transmission in a first subframe using a first cyclic shift, and

transmitting, by the user equipment, a plurality of additional ACK/NACK feedback responses corresponding to the same downlink transmission, each of the plurality of additional ACK/NACK feedback responses corresponding to the same downlink transmission being transmitted in a respective subframe using a respective cyclic shift different from the first cyclic shift used by the first ACK/NACK response corresponding to the same downlink transmission.

2. The method of claim 1, wherein each of the plurality of additional ACK/NACK feedback responses is a repetition of the first ACK/NACK feedback response.

3. The method of claim 1, wherein each of the respective subframes is a subframe following the first subframe.

4. The method of claim 1, wherein the first ACK/NACK feedback response is transmitted using a first uplink transmission resource, and the first uplink transmission resource is determined based on a location of a physical downlink control channel.

5. The method of claim 1, wherein the first ACK/NACK feedback response is transmitted using a first uplink transmission resource, and the first uplink transmission resource is determined based on an index associated with a physical downlink control channel.

6. The method of claim 1, wherein the downlink transmission is a single transmission of a Medium Access Control (MAC) Protocol Data Unit (PDU).

7. A user equipment comprising:

a receiver configured to receive a downlink transmission; and

a transmitter configured to provide acknowledgement (ACK) or negative acknowledgement (NACK) feedback upon receipt of the downlink transmission by transmitting a first ACK/NACK feedback response corresponding to the downlink transmission in a first subframe using a first cyclic shift, and transmitting a plurality of additional ACK/NACK feedback responses corresponding to the same downlink transmission, each of the plurality of additional ACK responses corresponding to the same downlink transmission being transmitted in a respective subframe using a respective cyclic shift different from the first cyclic shift used by the first ACK/NACK response corresponding to the same downlink transmission.

8. The user equipment of claim 7, wherein each of the plurality of additional ACK/NACK feedback responses is a repetition of the first ACK/NACK feedback response.

9. The user equipment of claim 7, wherein the first ACK/NACK feedback response is transmitted using a first uplink transmission resource, and the first uplink transmission resource is determined based on a location of a physical downlink control channel.

10. The user equipment of claim 7, wherein the first ACK/NACK feedback response is transmitted using a first uplink transmission resource, and the first uplink transmission resource is determined based on an index associated with a physical downlink control channel.

11. A method performed by a user equipment for providing acknowledgement (ACK) or a negative acknowledgement (NACK) feedback, the method comprising:

transmitting, by a transmitter of the user equipment, a first ACK/NACK response corresponding to a downlink transmission, the first ACK/NACK response transmitted in a first subframe using a first cyclic shift; and

repeating transmission, by the transmitter of the user equipment, of additional ACK/NACK responses corresponding to the same downlink transmission, each of the plurality of additional ACK/NACK responses corresponding to the same downlink transmission being transmitted in a respective subframe using a respective cyclic shift different from the first cyclic shift used by the first ACK/NACK response corresponding to the same downlink transmission.

12. A user equipment for providing acknowledgement (ACK) or a negative acknowledgement (NACK) feedback, the user equipment comprising:

a receiver configured to receive a downlink transmission; and

a transmitter configured to transmit a first ACK/NACK response corresponding to the downlink transmission, the first ACK/NACK response transmitted in a first subframe using a first cyclic shift, and repeat transmission of additional ACK/NACK responses corresponding to the same downlink transmission, each of the plurality of additional ACK/NACK responses corresponding to the same downlink transmission being transmitted in a respective subframe using a respective cyclic shift different from the first cyclic shift used by the first ACK/NACK response corresponding to the same downlink transmission.

13. A method performed by a user equipment to provide acknowledgement (ACK) or negative acknowledgement (NACK) feedback regarding a downlink transmission, the method comprising:

upon receipt of the downlink transmission;

transmitting, by the user equipment, a first ACK/NACK feedback response corresponding to the downlink transmission in a first subframe using a first cyclic shift;

transmitting, by the user equipment, a second ACK/NACK feedback response corresponding to the same downlink transmission in a second subframe using a second cyclic shift different from the first cyclic shift; and

transmitting, by the user equipment, a third ACK/NACK feedback response corresponding to the same downlink transmission in a third subframe using the second cyclic shift, wherein the second ACK/NACK feedback response and third ACK/NACK feedback response are repetitions of the first ACK/NACK response.

14. A user equipment, comprising:

a receiver configured to receive a downlink transmission; and

a transmitter configured to provide acknowledgement (ACK) or negative acknowledgement (NACK) feedback upon receipt of the downlink transmission by transmitting a first ACK/NACK feedback response corresponding to the downlink transmission in a first subframe using a first cyclic shift, transmitting a second ACK/NACK feedback response corresponding to the same downlink transmission in a second subframe using a second cyclic shift different from the first cyclic shift, and transmitting a third ACK/NACK feedback response corresponding to the same downlink transmission in a third subframe using the second cyclic shift, wherein the second ACK/NACK feedback response and third ACK/NACK feedback response are repetitions of the first ACK/NACK response.