Reference Signal Sharing for Repeated Data Transmission

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Solution Overview

Problem

Current wireless communication systems face challenges in efficiently transmitting and receiving reference signals, particularly in scenarios where data is repeatedly transmitted across multiple transmission time intervals (TTIs), leading to increased latency and reduced reliability due to excessive reference signal overhead and inaccurate channel estimation.

Innovation Solution

The proposed method involves sharing a reference signal across multiple TTIs where data is repeatedly transmitted, allowing for the reuse of channel estimation values from previous or subsequent TTIs to demodulate data or obtain channel state information, thereby reducing reference signal overhead and improving data throughput and reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a reference signal is transmitted in every TTI for repeated data transmission, then channel estimation accuracy is improved, but reference signal overhead increases and data throughput decreases

Engineering Contradiction:

Improvechannel estimation accuracyVSAvoiddata throughput

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent merges the reference signal transmission across multiple TTIs by transmitting a single reference signal that serves multiple repeated data transmissions. The UE combines reference signal resources from multiple TTIs to perform channel estimation, thereby reducing the total number of reference signals while maintaining estimation accuracy.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The reference signal is designed to serve multiple functions across different TTIs. A single reference signal transmission is used to enable channel estimation for multiple repeated data transmissions, making the reference signal universally applicable across the repeated transmission sequence rather than requiring dedicated reference signals for each TTI.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Productivity

If reference signal overhead is reduced by sharing across TTIs, then data throughput is improved, but channel estimation reliability may deteriorate

Engineering Contradiction:

Improvedata throughputVSAvoidchannel estimation reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent ensures continuous channel estimation capability across repeated TTIs by allowing the UE to accumulate and combine reference signal measurements from multiple TTIs. This continuous accumulation of channel information maintains estimation reliability even though reference signals are not transmitted in every TTI.

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The reference signal is transmitted in advance in selected TTIs to provide channel estimation information that can be reused for subsequent repeated transmissions. This preliminary channel estimation action prepares the UE to decode multiple future data transmissions without requiring immediate reference signals in each TTI.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If reference signals are transmitted in all TTIs, then transmission reliability is maintained, but latency increases due to excessive overhead

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidtransmission latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent extracts the essential function of reference signal transmission from every TTI and concentrates it in selected TTIs. By taking out the redundant reference signal transmissions and retaining only the necessary ones, the system maintains transmission reliability while reducing the time-consuming overhead.

Inventive Principle:

Principle #2Taking out (Extraction)

4Measurement precision

If reference signal overhead is increased to ensure accurate channel estimation, then demodulation accuracy is improved, but resource efficiency decreases

Engineering Contradiction:

Improvedemodulation accuracyVSAvoidresource efficiency

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent discards redundant reference signal transmissions in TTIs where data is repeatedly transmitted, and recovers the necessary channel estimation information by combining measurements from other TTIs. This discarding of unnecessary reference signals while recovering channel information improves resource efficiency while maintaining demodulation accuracy.

Inventive Principle:

Principle #34Discarding and recovering

Data Source

PatentUS11483118B2Method for transmitting and receiving reference signal and apparatus therefor

Publication Date: 2022.10.25 LG ELECTRONICS INC

AI summary

A method of receiving, by a user equipment (UE), a reference signal in a wireless communication system. The method includes: receiving downlink control information (DCI) for scheduling downlink data in a first transmission time interval (TTI); acquiring, from the DCI, information related to whether the reference signal is included in the first TTI in which the downlink data is scheduled; and receiving, in the first TTI, the reference signal for the first TTI based on the information related to whether the reference signal is included in the first TTI. The method further includes, based on the downlink data scheduled to be repeatedly transmitted in the first TTI and at least one second TTI: receiving, in each of the at least one second TTI, a reference signal for the each of the at least one second TTI.