Air Interface Resource Scheduling for Ultra-Low Latency Wireless

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Solution Overview

Problem

Existing wireless communication systems, such as LTE, face challenges in meeting ultra-low latency and high reliability requirements due to high transmission latency caused by multiple hybrid automatic repeat request (HARQ) retransmissions, which are not suitable for services like industrial production and remote medicine surgery.

Innovation Solution

A resource scheduling and allocation method that allocates air interface resources for multiple data transmissions using downlink control information, allowing for immediate retransmissions without waiting for next scheduling, thereby reducing latency and improving data transmission reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple HARQ retransmissions are used to ensure data transmission reliability, then data transmission reliability is improved, but transmission latency increases

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidtransmission latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent pre-allocates air interface resources for multiple data transmissions (including retransmissions) in advance through downlink control information. This allows the transmit end to perform retransmissions immediately without waiting for next scheduling opportunities or feedback messages, thereby reducing transmission latency while ensuring data transmission reliability through multiple pre-scheduled transmission opportunities.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If multiple HARQ retransmissions are performed until data is correctly received or maximum retransmission limit is reached, then data transmission reliability is improved, but transmission latency increases

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidretransmission latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If air interface resources are allocated for each data transmission through separate scheduling, then resource allocation flexibility is improved, but control information overhead increases

Engineering Contradiction:

Improveresource allocation flexibilityVSAvoidcontrol information overhead

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The patent merges multiple resource allocation operations into a single downlink control information message. By allocating air interface resources for multiple data transmissions simultaneously through one DCI message rather than separate scheduling messages, the patent reduces control information overhead and signaling complexity while maintaining resource allocation flexibility through the ability to specify different resource parameters for each transmission.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentEP3419370B1Method and device scheduling and allocating resource

Publication Date: 2022.05.11 HUAWEI TECH CO LTD

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AI summary

This application relates to the mobile communications field, and in particular, to an air interface resource scheduling and allocation technology in the wireless communications field. In a resource scheduling and allocation method, a network device allocates, by using a downlink control information, an air interface resource used for N data transmissions to same user equipment, the downlink control information includes information about the air interface resource used for the N data transmissions, and N is an integer greater than 1. According to the solutions provided in this application, a data retransmission may be performed by flexibly scheduling and allocating a retransmission type and a corresponding air interface resource within a service latency allowance range, so that data transmission reliability is ensured while a service latency requirement is satisfied.