Downlink Shared Channel Repetition for System Information Coverage

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Solution Overview

Problem

Wireless communications systems face challenges in improving coverage and reducing power consumption due to large payload sizes of downlink shared channels carrying system information, which lead to coverage bottlenecks and increased power consumption.

Innovation Solution

Techniques involving combining and repetition of downlink shared channels, such as increasing the number of symbols and repetitions, are employed to enhance coverage and reduce power consumption by allowing devices to buffer and combine signals across multiple transmissions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If the payload size of downlink shared channels is increased to carry more system information, then the information carrying capacity is improved, but the coverage area deteriorates due to signal attenuation and blocking

Engineering Contradiction:

Improvepayload sizeVSAvoidcoverage area

Core Design Contradiction:

Quantity of substanceVSArea of stationary object

Solution Approach 1:

The system segments the downlink shared channel transmissions into multiple smaller repetitions rather than sending one large payload. Each repetition carries the same system information but can be independently received and combined, allowing devices in coverage edge areas to successfully decode by accumulating signals from multiple transmissions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system performs preliminary action by transmitting multiple repetitions of the downlink shared channel before the device needs to decode the system information. This allows devices to buffer and combine signals in advance, improving the probability of successful decoding even in challenging coverage conditions.

Inventive Principle:

Principle #10Preliminary action

2Area of stationary object

If the number of repetitions for downlink shared channel is increased to improve coverage, then the coverage area is improved, but the power consumption increases

Engineering Contradiction:

Improvecoverage areaVSAvoidpower consumption

Core Design Contradiction:

Area of stationary objectVSUse of energy by moving object

Solution Approach 1:

The system enables self-service by allowing devices to autonomously buffer and combine multiple repetitions of the downlink shared channel. Devices can accumulate signals across repetitions and perform decoding independently without requiring retransmissions or additional network assistance, reducing overall system power consumption while extending device operating time.

Inventive Principle:

Principle #25Self-service

3Area of stationary object

If the number of symbols and repetitions is increased to enhance coverage, then the coverage area is improved, but the time required for transmission increases

Engineering Contradiction:

Improvecoverage areaVSAvoidtransmission time

Core Design Contradiction:

Area of stationary objectVSLoss of time

Solution Approach 1:

The system employs periodic action by transmitting the downlink shared channel in regular repetitions at defined intervals. This allows devices to receive and combine signals over multiple periodic transmissions, achieving enhanced coverage without requiring continuous transmission, thus balancing coverage extension with time efficiency.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS20250380272A1System information coverage enhancement via combining and repetition

Publication Date: 2025.12.11 QUALCOMM INC

AI summary

Certain aspects of the present disclosure provide techniques for enhancing coverage of system information via combining and repetition. A method generally includes receiving signaling indicative of a number of repetitions for a downlink shared channel, wherein the downlink shared channel comprises system information; and monitoring for repetitions of the downlink shared channel according to the number of repetitions.