Method and arrangement for retransmission using HARQ

Patent metadata

Field	Value
Publication number	US-9698942-B2
Application number	US-201514628520-A
Country	US
Kind code	B2
Filing date	Feb 23, 2015
Priority date	Jun 18, 2007
Publication date	Jul 4, 2017
Grant date	Jul 4, 2017

Abstract

The present invention relates to a method and device for enhancing coverage of a power-limited mobile terminal by sending information relating to a single Hybrid Automatic Repeat Request (HARQ) process from the mobile terminal to a base station using several transmission time intervals.

First claim

What is claimed is:

1. A method in a mobile terminal connectable to a base station, the method comprising the steps of:
transmitting information related to a single Hybrid Automatic Repeat Request (HARQ) process to the base station as a first transmission time interval (TTI) bundle, the first TTI bundle being a first plurality of consecutive TTIs treated as a single resource, starting with a first TTI;
receiving a HARQ negative acknowledgment (NACK) from the base station; and
retransmitting the information related to the single HARQ process to the base station as a second TTI bundle, the second TTI bundle being a second plurality of consecutive TTIs treated as a single resource, starting at a first HARQ round trip time subsequent to the first TTI, after an additional delay.

2. The method of claim 1 , wherein the HARQ NACK is received from the base station in circumstances where an initial number of retransmissions was insufficient.

3. The method of claim 1 , further comprising receiving the number of TTIs to be used in the first TTI bundle in a media access control (MAC) control message or via radio resource control (RRC) signaling.

4. The method of claim 1 , wherein the same number of TTIs are used for the transmission of the first TTI bundle and the second TTI bundle.

5. The method of claim 1 , wherein the first TTI bundle and/or the second TTI bundle are transmitted using four TTIs.

6. The method of claim 1 , wherein a redundancy version of the HARQ process is sent in each TTI.

7. The method of claim 1 , wherein the HARQ NACK is received from the base station after a last TTI of the first TTI bundle is transmitted.

8. The method of claim 1 , wherein the additional delay is at least one TTI in length.

9. A method in a base station connectable to a mobile terminal, the method comprising the steps of:
configuring the mobile terminal to transmit information relating to a single Hybrid Automatic Repeat Request (HARQ) process as a first transmission time interval (TTI) bundle, the first TTI bundling being a first plurality of consecutive TTIs treated as a single resource, starting with a first TTI;
receiving the transmission of information relating to the HARQ process;
transmitting a HARQ negative acknowledgment (NACK) in response to determining that the information was incorrectly received; and
receiving a retransmission of the information relating to the HARQ process as a second TTI bundle, the second TTI bundle being a second plurality of consecutive TTIs treated as a single resource, starting at a first HARQ round trip time subsequent to the first TTI, after an additional delay.

10. The method of claim 9 , wherein the configuring further comprises:
transmitting the number of TTIs to be used in the first TTI bundle in a media access control (MAC) control message or via radio resource control (RRC) signaling.

11. The method of claim 9 wherein the same number of TTIs are used for the reception of the first TTI bundle and the second TTI bundles.

12. The method of claim 9 , wherein the first TTI bundle and/or the second TTI bundle are received using four TTIs.

13. The method of claim 9 , wherein a redundancy version of the HARQ process is received in each TTI.

14. The method of claim 9 , wherein the HARQ NACK is transmitted after a last TTI of the first TTI bundle is received.

15. The method of claim 9 , wherein the additional delay is at least one TTI in length.

16. A mobile terminal connectable to a base station, the mobile terminal comprising:
a transmitter that transmits information related to a single Hybrid Automatic Repeat Request (HARQ) process to the base station as a transmission time interval (TTI) bundle, the first TTI bundle being a first plurality of consecutive TTIs treated as a single resource, starting with a first TTI;
a receiver that receives a HARQ negative acknowledgment (NACK) from the base station; and
wherein the transmitter retransmits the information as a second TTI bundle, the second TTI bundle being a second plurality of consecutive TTIs treated as a single resource, starting at a first HARQ round trip time subsequent to the first TTI, after an additional delay.

17. The mobile terminal of claim 16 , wherein the HARQ NACK is received from the base station after a last TTI of the first TTI bundle is transmitted.

18. The mobile terminal of claim 16 , wherein the additional delay is at least one TTI in length.

19. A base station connectable to a mobile terminal, the base station comprising:
a configuration component that configures the mobile terminal to transmit information relating to a single Hybrid Automatic Repeat Request (HARQ) process as a transmission time interval (TTI) bundle, the first TTI bundle being a first plurality of consecutive TTIs treated as a single resource, starting with a first TTI;
a receiver that receives the transmission of information relating to the HARQ process;
a transmitter that transmits a HARQ negative acknowledgment (NACK) in response to determining that the information was incorrectly received; and
wherein the receiver receives a retransmission of the information relating to the HARQ process as a second TTI bundle, the second TTI bundle being a second plurality of consecutive TTIs treated as a single resource, starting at a first HARQ round trip time subsequent to the first TTI, after an additional delay.

20. The base station of claim 19 , wherein the HARQ NACK is transmitted after a last TTI of the first TTI bundle is received.

21. The base station of claim 19 , wherein the additional delay is at least one TTI in length.

Assignees

• Optis Wireless Technology Llc

Inventors

• Sagfors Mats Fredrik
• Meyer Michael
• Torsner Per Johan
• Wiemann Henning

Classifications

• H04L1/1819 Primary

  with retransmission of additional or different redundancy · CPC title

• H04L1/1896

  ARQ related signaling · CPC title

• H04L1/1887

  Scheduling and prioritising arrangements · CPC title

• H04L1/1812

  Hybrid protocols; Hybrid automatic repeat request [HARQ] · CPC title

• H04L1/08 Primary

  by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)} · CPC title