UE Transport Block Repetition Adaptation via Feedback Channels

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Solution Overview

Problem

In wireless communication, especially for Machine-Type Communication (MTC), eNodeB lacks accurate Channel State Information (CSI) feedback from User Equipment (UE), leading to inefficient repetition times for uplink transmissions, resulting in excessive power and resource consumption.

Innovation Solution

A method where the UE transmits multiple repetition sets of a transport block with feedback channels to indicate successful decoding by the eNodeB, allowing the UE to adapt repetition times based on transmission conditions, thereby optimizing power and resource usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple repetition sets are transmitted to guarantee successful decoding, then reliability is improved, but energy consumption increases

Engineering Contradiction:

Improvesuccessful decoding rateVSAvoidUE power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements a feedback mechanism where the eNB sends decoding status information (ACK/NACK) to the UE after each repetition set. The UE uses this feedback to determine whether to continue transmitting repetitions or stop, thereby avoiding unnecessary energy consumption while ensuring reliable delivery when needed.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent makes the repetition transmission dynamic by allowing the UE to adapt the number of repetition sets based on real-time feedback from the eNB. Instead of fixed repetitions, the transmission continues or stops dynamically according to decoding success, optimizing the balance between reliability and energy consumption.

Inventive Principle:

Principle #15Dynamics

2Reliability

If multiple repetition sets are transmitted to guarantee successful decoding, then reliability is improved, but time-frequency resource usage increases

Engineering Contradiction:

Improvesuccessful decoding rateVSAvoidtime-frequency resources

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The feedback mechanism allows the system to stop transmitting repetition sets once successful decoding is achieved, preventing waste of time-frequency resources on redundant transmissions. The eNB's ACK signal terminates the repetition process, optimizing resource utilization while maintaining reliability.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent applies partial action by transmitting only the necessary number of repetition sets required for successful decoding, rather than always transmitting the maximum possible repetitions. This optimizes resource usage by performing just enough action to achieve the desired reliability.

Inventive Principle:

Principle #16Partial or excessive action

3Device complexity

If eNB uses fixed repetition times for uplink transmission, then device complexity is reduced, but adaptability worsens

Engineering Contradiction:

Improvetransmission control complexityVSAvoidtransmission condition adaptation

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The feedback channel provides the eNB with information about transmission conditions (decoding success/failure), enabling adaptive adjustment of repetition times. This maintains relatively simple device operation while significantly improving adaptability to different channel conditions through the feedback-driven adjustment mechanism.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20240340119A1Wireless communication method, user equipment and enode b

Publication Date: 2024.10.10 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

AI summary

Provided are wireless communication methods, a UE and an eNB. The wireless communication method performed by a UE includes transmitting transport block repetitions to an eNB, wherein one HARQ process includes multiple repetition sets of a transport block if one repetition set of the transport block is not enough for the eNB to successfully decode the transport block, each of the multiple repetition sets includes multiple repetitions of the transport block, each of the multiple repetition sets is followed by a feedback channel to indicate whether the transport block is successfully decoded by the eNB.