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Feedback with configurable latency

A technology of feedback information and feedback delay, applied in the field of feedback with configurable delay, can solve problems such as increasing HARQ overhead

Inactive Publication Date: 2019-10-11
IPCOM GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Currently under discussion are enhancements to the cellular mobile air interface to provide ultra-low latency, reducing the TTI to 0.1ms-0.2ms, thereby significantly increasing the resulting HARQ overhead

Method used

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  • Feedback with configurable latency
  • Feedback with configurable latency
  • Feedback with configurable latency

Examples

Experimental program
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Embodiment Construction

[0033] figure 2 , 3 and 4 show feedback delays for different configurations of the feedback period n.

[0034] Sending a feedback message for each transport block received (feedback period "n" = 1) results in a very short round trip time, whereas sending a feedback message after receiving multiple transport blocks (n >> 1) results in a longer feedback Latency, reduced overhead (eg lower number of feedback messages) and thus reduced power consumption in the receiver for transmission.

[0035] Using the principle of fixed transmission duration is beneficial because the physical resource layout (ie the arrangement of physical signals and physical channels within the time-frequency resource) is the same for all feedback delays chosen. Hence, there is no need to reconfigure the physical layer for different delay requirements and it is easy to confuse transmissions using different feedback delays, eg from different UEs on the same resource grid or for the same UE and different se...

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Abstract

The invention provides a method for providing configurable feedback latency in a communication system in which a feedback information message is sent after reception of a data transmission, the methodcomprising transmitting a single combined feedback information message following receipt of a configurable number of received transport blocks.

Description

technical field [0001] The present invention relates to a technique for providing feedback on successful or otherwise reception of transmitted data in a communication system, especially a mobile communication system. Background technique [0002] Mobile communication systems have to cope with unstable and unreliable transmission conditions due to effects such as multipath fading of radio channels. Some effects can be compensated for, eg by using adaptive modulation or forward error correction (FEC), so that data bits are received without errors. In some cases, bit errors cannot be avoided. In this case, error detection means are used to detect erroneous data packets and request retransmission. This is commonly known as Automatic Repeat Request (ARQ). [0003] In LTE, Hybrid Automatic Repeat reQuest (HARQ) is used. This combines FEC and ARQ. Each data packet includes some redundant bits that enable the receiver to detect erroneous packets. The length of time used to tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04L1/16
CPCH04L1/1825H04L1/1822H04L1/1621H04L1/1809H04L1/1812H04L1/1861H04L5/0055H04W28/04
Inventor M·别纳斯M·汉斯
Owner IPCOM GMBH & CO KG