Downlink Control Information for Repeated Data Transmission

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Solution Overview

Problem

Current wireless communication systems face challenges in achieving cost reduction per bit, increased service availability, flexible frequency band use, simplified structure, and appropriate power consumption, particularly in efficiently transmitting and receiving downlink data with high reliability and low latency.

Innovation Solution

The method involves a user equipment (UE) and base station operating in transmission mode 10, where downlink control information including resource element mapping information is received, and repeated transmissions of downlink data are decoded across multiple short transmission time intervals (TTIs) by the same transmission point, utilizing common resource element mapping information for enhanced reliability and low latency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If repeated transmissions of downlink data are performed across multiple TTIs to enhance reliability, then transmission reliability is improved, but transmission latency increases

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidtransmission latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The base station pre-configures the UE with resource element mapping information before the repeated transmissions begin. This preliminary configuration allows the UE to immediately decode the repeated transmissions without waiting for additional control information in each TTI, thereby reducing latency while maintaining reliability through repeated transmissions

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The same downlink data is copied and transmitted repeatedly across multiple TTIs with the same resource element mapping. The UE receives these repeated copies and can decode them using the pre-configured mapping information, achieving reliability through redundancy without the latency penalty of dynamic reconfiguration

Inventive Principle:

Principle #26Copying

2Adaptability or versatility

If resource element mapping information is dynamically updated for each TTI to adapt to channel conditions, then transmission adaptability is improved, but control signaling overhead increases

Engineering Contradiction:

Improvetransmission adaptabilityVSAvoidcontrol signaling overhead

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The pre-configured resource element mapping information serves multiple TTIs simultaneously. A single DCI message with resource element mapping information enables the UE to decode repeated transmissions across multiple subsequent TTIs, making the control information universal for multiple transmission instances rather than requiring separate control information for each TTI

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The resource element mapping information for multiple repeated transmissions is merged into a single DCI message transmitted in one TTI. This consolidation reduces control signaling overhead by eliminating redundant control information while maintaining the ability to adapt to channel conditions through the initial configuration

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS11218279B2Method and apparatus for transmitting and receiving downlink data

Publication Date: 2022.01.04 LG ELECTRONICS INC

AI summary

A method of receiving, by a user equipment (UE) that is configured to operate in transmission mode 10, downlink data in a wireless communication system. The method includes: receiving, in a transmission time interval (TTI), downlink control information (DCI) that includes resource element (RE) mapping information. The method also includes receiving, in a plurality of TTIs subsequent to the TTI in which the DCI was received, repeated transmissions of the downlink data to which the RE mapping information has been applied.