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Methods and apparatuses for controlling timing of feedback transmissions

A timing and retransmission technology, which is applied in the transmission system, digital transmission system, error prevention/detection using the return channel, etc., can solve the problem that the channel is not fully utilized, UE power consumption, etc., and achieve the effect of optimizing trade-offs

Active Publication Date: 2018-05-11
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Therefore, if feedback is provided quickly, there is a risk that the channel is underutilized and UE power consumption increases

Method used

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  • Methods and apparatuses for controlling timing of feedback transmissions
  • Methods and apparatuses for controlling timing of feedback transmissions
  • Methods and apparatuses for controlling timing of feedback transmissions

Examples

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Embodiment Construction

[0039] Communication systems in which embodiments herein are applied may employ retransmission mechanisms in order to ensure that data streams are accurately delivered to users despite errors that may occur during transmission. Examples of these retransmission mechanisms may be ARQ and / or HARQ as defined in 3GPP for UMTS and / or LTE.

[0040]A feature introduced by the frame structure outlined above is the ability to send retransmission feedback by a receiving device such that before a certain subframe ends or times out, the sending device can receive retransmissions related to data packets sent in that subframe feedback. Frame structures that provide the possibility for this feedback may eg for TDD require duplex direction switching in each subframe and thus introduce a corresponding guard period overhead in each subframe. This would imply an underutilization of the communication link corresponding to the guard period of each subframe. Also, for FDD as mentioned before, to a...

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Abstract

There is disclosed a method for controlling the timing of feedback transmissions by a communication device (80) communicating over a communication link (70), wherein the communication link supports aretransmission scheme. The method comprises transmitting (42) a feedback timing indicator, FTI, wherein the indicator is selected from a set of indicators.

Description

technical field [0001] Embodiments herein relate generally to telecommunications and / or data communications, and in particular to methods for controlling feedback transmission when automatic repeat request (ARQ) and / or hybrid automatic repeat request (HARQ) retransmission mechanisms are used Timing method and apparatus. Background technique [0002] Modern wireless communication systems use a retransmission mechanism commonly denoted Automatic Repeat Request (ARQ). In the ARQ mechanism, a data packet sent from a transmitter is appended with a CRC. The receiver decodes the data packet, recalculates the CRC and compares the obtained CRC with the sent CRC. If the CRC matches, an acknowledgment (ACK) is sent as feedback to the transmitter to indicate that the corresponding data packet was received correctly, otherwise a negative acknowledgment (NACK) is sent as feedback to the transmitter to indicate that the data packet was not received correctly. Based on this feedback (ACK...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18
CPCH04L1/1685H04L1/1896H04L1/1887H04L1/1812
Inventor S·帕克瓦尔R·巴尔德梅尔
Owner TELEFON AB LM ERICSSON (PUBL)
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