Downlink control and retransmission indicator channel for relaxing ACK processing time constraints

Patent metadata

Field	Value
Publication number	US-10721044-B2
Application number	US-201615070694-A
Country	US
Kind code	B2
Filing date	Mar 15, 2016
Priority date	Mar 15, 2016
Publication date	Jul 21, 2020
Grant date	Jul 21, 2020

Abstract

Systems and methods are disclosed for minimizing latency between receipt of a NACK at a base station from a user equipment (UE) and retransmission of data to the UE. Time constraints for processing the ACK/NACK are relaxed so the base station can decode the ACK/NACK to determine whether a NACK has been received and then prepare for transmission of the appropriate data to the UE in the immediately following transmission time interval (TTI). These constraints are relaxed by separating download data indicator (DDI) from the PDCCH control data and delaying transmission of the DDI until decoding of the ACK/NACK.

First claim

What is claimed is:

1. A method of wireless communication, comprising:
transmitting, from a first wireless communication device to a second wireless communication device, a first downlink control waveform during a first symbol period of a transmission time interval (TTI), the first downlink control waveform constructed without downlink data indicators;
transmitting, from the first wireless communication device to the second wireless communication device, a first data waveform in accordance with the first downlink control waveform that is decodable without the downlink data indicators;
transmitting, from the first wireless communication device to the second wireless communication device, a second downlink control waveform during a second symbol period of the TTI, the second symbol period being different than the first symbol period, and the second downlink control waveform constructed to include the downlink data indicators; and
transmitting, from the first wireless communication device to the second wireless communication device, a second data waveform in accordance with the second downlink control waveform.

2. The method of claim 1 , wherein the first downlink control waveform does not include a new data indicator (NDI) or a redundancy version (RV).

3. The method of claim 1 , wherein the downlink data indicators of the second downlink control waveform include a modulation and coding scheme (MCS), a new data indicator (NDI), and a redundancy version (RV).

4. The method of claim 1 , wherein the second data waveform is transmitted after the second symbol period.

5. The method of claim 4 , further comprising receiving, at the first wireless communication device, an ACK notification prior to transmitting the second downlink control waveform, wherein the first and second data waveforms comprise new data.

6. The method of claim 4 , further comprising receiving, at the first wireless communication device, an ACK notification prior to transmitting the second downlink control waveform, wherein the second data waveform comprises retransmission data.

7. The method of claim 4 , further comprising receiving, at the first wireless communication device, a NACK notification prior to transmitting the second downlink control waveform, wherein the second data waveform comprises retransmission data.

8. The method of claim 1 , wherein the first and second data waveforms comprise new data.

9. The method of claim 8 , further comprising:
receiving, at the first wireless communication device, an ACK notification prior to transmitting the second downlink control waveform; and
continuing transmission of the new data with the second data waveform after the first symbol period.

10. The method of claim 8 , further comprising:
receiving, at the first wireless communication device, a NACK notification prior to transmitting the second downlink control waveform; and
changing, in response to the NACK notification, the second data waveform to retransmission data, wherein the transmitting the second data waveform comprises transmission of the retransmission data of the second data waveform after the first symbol period.

11. A method of wireless communication, comprising:
receiving, at a first wireless communication device from a second wireless communication device, a first downlink control waveform during a first symbol period of a transmission time interval (TTI), the first downlink control waveform constructed without downlink data indicators;
receiving, at the first wireless communication device from the second wireless communication device, a first data waveform in accordance with the first downlink control waveform that is decodable without the downlink data indicators;
receiving, at the first wireless communication device from the second wireless communication device, a second downlink control waveform during a second symbol period of the TTI, the second symbol period being different than the first symbol period, and the second downlink control waveform constructed to include the downlink data indicators; and
receiving, at the first wireless communication device from the second wireless communication device, a second data waveform in accordance with the second downlink control waveform.

12. The method of claim 11 , wherein the first downlink control waveform does not include a new data indicator (NDI) or a redundancy version (RV).

13. The method of claim 11 , wherein the downlink data indicators of the second downlink control waveform include a modulation and coding scheme (MCS), a new data indicator (NDI), and a redundancy version (RV).

14. The method of claim 11 , wherein the second data waveform is received after the second symbol period.

15. The method of claim 14 , further comprising transmitting, from the first wireless communication device to the second wireless communication device, an ACK notification prior to receiving the second downlink control waveform, wherein the first and second data waveforms comprise new data.

16. The method of claim 14 , further comprising transmitting, from the first wireless communication device to the second wireless communication device, an ACK notification prior to receiving the second downlink control waveform, wherein the second data waveform comprises retransmission data.

17. The method of claim 14 , further comprising transmitting, from the first wireless communication device to the second wireless communication device, a NACK notification prior to receiving the second downlink control waveform, wherein the second data waveform comprises retransmission data.

18. The method of claim 11 , wherein the first and second data waveforms comprise new data.

19. The method of claim 18 , further comprising:
transmitting, from the first wireless communication device to the second wireless communication device, an ACK notification prior to receiving the second downlink control waveform; and
continuing reception of the new data with the second data waveform after the first symbol period.

20. The method of claim 18 , further comprising:
transmitting, from the first wireless communication device to the second wireless communication device, a NACK notification prior to receiving the second downlink control waveform; and
continuing reception of the second data waveform after the first symbol period, wherein the second data waveform is received after the first symbol period has been changed to retransmission data.

21. A first wireless communication device, comprising:
a transceiver configured to:
transmit, to a second wireless communication device, a first downlink control waveform during a first symbol period of a transmission time interval (TTI), the first downlink control waveform constructed without downlink data indicators;
transmit, to the second wireless communication device, a first data waveform in accordance with the first downlink control waveform that is decodable without the downlink data indicators;
transmit, to the second wireless communication device, a second downlink control waveform during a second symbol period of the TTI, the second symbol period being different than the first symbol period, and the second downlink control waveform constructed to include the downlink data indicators; and transmit, to the second wireless communication device, a second data waveform in accordance with the second downlink control waveform.

22. The first wireless communication device of claim 21 , wherein the first downlink control waveform does not include a n

Assignees

• Qualcomm Inc

Inventors

• Ang Peter Pui Lok
• Jiang Jing
• Mukkavilli Krishna Kiran
• Ji Tingfang
• Smee John Edward
• Lin Jamie Menjay
• Cooper Rotem
• Howard Michael Alexander

Classifications

• H04L1/0025

  Transmission of mode-switching indication · CPC title

• H04L1/008

  where the control data relates to payload of a different packet · CPC title

• H04L5/0055

  Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861) · CPC title

• H04L1/0031

  Multiple signaling transmission (H04L1/1664, F15 take precedence) · CPC title

• H04L5/0044

  Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH · CPC title