Method and arrangement for retransmission using HARQ

摘要

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.

主权项

1. A method in a mobile terminal of communicating information to a base station, the method comprising:
transmitting multiple copies of the information in a single Hybrid Automatic Repeat Request (HARQ) process to the base station in a first transmission as a transmission time interval (TTI) bundle that includes several consecutive TTIs starting with a first TTI, wherein the transmitting further comprises: transmitting a first copy of the information in a first TTI of the TTI bundle, the first TTI marking the start of an initial HARQ round trip time (RTT); and retransmitting one or more copies of the first copy of the information in subsequent TTIs of the TTI bundle before receiving an acknowledgment from the base station; responsive to receiving a HARQ NACK from the base station after the entire TTI bundle has been transmitted, which indicates that the multiple copies of the information has not been successfully received, retransmitting the information as a second TTI bundle that also includes several consecutive TTIs containing the multiple copies of the information, starting at a subsequent HARQ round trip.