Simultaneous Redundancy Transmission for Ultra-Low Latency Communications

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Solution Overview

Problem

Existing communication technologies face challenges in achieving high reliability and low latency, particularly in ultra-low latency communication scenarios, where conventional methods like TTI bundling, asynchronous HARQ, and additional hardware relaying induce delays and are not feasible in mission-critical applications.

Innovation Solution

A method involving simultaneous data and redundancy transmissions over different channels, with validity checks and conditional stop or postponement of redundancy transmissions based on acknowledgment messages, maximum retransmissions, or timer expiration, to enhance reliability and efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional TTI bundling is used to increase reliability, then redundancy is provided, but huge delay is incurred

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidtransmission delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent pre-configures multiple redundancy transmission resources (PUCCH resources) before data transmission. When a NACK is received or timeout occurs, the system can immediately retransmit using pre-allocated resources without waiting for resource allocation, thereby reducing delay while maintaining reliability through multiple redundancy transmission opportunities

Inventive Principle:

Principle #10Preliminary action

2Loss of time

If asynchronous HARQ with short TTI is used, then latency is reduced, but reliability cannot be guaranteed due to possible retransmission sequences

Engineering Contradiction:

ImprovelatencyVSAvoidcommunication reliability

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The patent implements dynamic HARQ process management where multiple HARQ processes can be simultaneously active. The system dynamically selects which HARQ process to use for retransmission based on current buffer status and resource availability, allowing flexible adaptation between latency and reliability requirements without fixed retransmission sequences

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent segments the HARQ retransmission process into independent parallel processes. Instead of sequential retransmissions, multiple HARQ processes operate independently with their own buffers and resources, enabling simultaneous retransmission attempts that reduce overall latency while maintaining reliability through diversity

Inventive Principle:

Principle #1Segmentation

3Reliability

If multiple redundancy transmissions are performed, then reliability is increased, but resource overhead increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidresource overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent configures a maximum number of redundancy transmissions (e.g., up to 4 attempts) but terminates early upon successful ACK reception. This partial action approach provides sufficient reliability for ultra-reliable low-latency communication (URLLC) without always executing the full complement of redundancy transmissions, thereby optimizing resource overhead while meeting reliability targets

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS11387946B2Reliable ultra-low latency communications

Publication Date: 2022.07.12 KONINKLIJKE PHILIPS NV

AI summary

Methods and systems for communicating according to an automatic repeat request, ARQ, scheme, and/or hybrid ARQ, HARQ, scheme are provided. A method may include: performing a first data transmission on a dedicated resource on a first channel; simultaneously to the first data transmission or in a subsequent resource, performing at least one redundancy transmission.