DCI Configuration for Unlicensed Spectrum Data Transmission Start

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Solution Overview

Problem

In wireless communications networks, receiving devices experience excessive power consumption due to the need for continuous blind detection to determine the start of data transmission on unlicensed spectrum channels, as the start of data transmission is random and not aligned with subframe boundaries.

Innovation Solution

A method where a network device includes a first field in the downlink control information of a second subframe to indicate the start location of an adjacent first subframe, allowing user equipment to determine the start of data transmission without continuous blind detection, thereby reducing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the receiving device performs continuous blind detection to determine the start of data transmission on unlicensed spectrum, then the data transmission can be initiated at random moments, but the power consumption of the receiving device becomes excessively large

Engineering Contradiction:

Improveflexibility of data transmission start timeVSAvoidpower consumption of receiving device

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent applies preliminary action by having the sending device pre-indicate the start location of data transmission in the first subframe before the actual data transmission begins. This is achieved by sending indication information that specifies where the data will start, allowing the receiving device to prepare in advance and stop continuous blind detection, thereby significantly reducing power consumption while maintaining the ability to transmit data at flexible moments

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses an intermediary approach by introducing indication information as a mediator between the sending and receiving devices. This indication information acts as a signal that conveys the start location of data transmission, eliminating the need for continuous blind detection. The intermediary signal enables the receiving device to know in advance when data will start, resolving the contradiction between transmission flexibility and power consumption

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the data transmission starts at random moments not aligned with subframe boundaries, then the data throughput increases by utilizing unlicensed spectrum efficiently, but the receiving device cannot determine the transmission start moment without continuous blind detection

Engineering Contradiction:

Improvedata throughputVSAvoiddifficulty of determining transmission start moment

Core Design Contradiction:

ProductivityVSDifficulty of detecting and measuring

Solution Approach 1:

The sending device performs preliminary action by indicating the start location of data transmission in advance within the first subframe. This indication information is sent before the actual data transmission begins, allowing the receiving device to know exactly when to start receiving without performing continuous blind detection. This maintains the ability to transmit at flexible moments while eliminating the detection difficulty

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The indication information serves as an intermediary that bridges the gap between random data transmission start times and the receiving device's need to know when to start receiving. By introducing this mediator signal that carries start location information, the patent resolves the contradiction between maintaining transmission flexibility and reducing detection difficulty

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If the receiving device performs continuous blind detection to determine data transmission start, then no information about start location is needed, but the device complexity and processing overhead increase

Engineering Contradiction:

Improvesimplicity of receiving operationVSAvoidcomplexity of blind detection process

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent extracts the start location information from the data transmission process and places it in the indication information within the first subframe. By separating this critical information and providing it explicitly, the patent eliminates the need for complex continuous blind detection. The receiving device can simply read the indicated start location and begin receiving at that point, significantly reducing device complexity while maintaining ease of operation

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS10476721B2Information transmission method, device, and system using DCI configuration

Publication Date: 2019.11.12 HUAWEI TECH CO LTD

AI summary

The present invention discloses an information transmission method, a device, and a system, and relates to the communications field, so as to resolve a problem that a receiving device has excessively large power consumption because the receiving device needs to continuously perform blind detection on a channel to determine a moment at which data transmission is started. A specific solution is: obtaining, by a network device, a start location of a first subframe, configuring a first field in downlink control information DCI of a second subframe, and sending, to user equipment, the first subframe and the second subframe that are adjacent to each other, where the first field is used to indicate the start location of the first subframe. The present invention is used for information transmission.