Repeated PDCCH Scheduling for Reliable PDSCH Transmission

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Solution Overview

Problem

Existing 5G communication systems face challenges in efficiently scheduling and transmitting downlink control information (DCI) for physical downlink shared channels (PDSCH) due to the need for improved methods to handle repetitive transmissions and dynamic resource allocation, especially in scenarios involving multiple services like eMBB, mMTC, and URLLC, which can lead to interference and data loss.

Innovation Solution

The proposed solution involves configuring a reference start symbol for scheduling PDSCH transmission through repetitive DCI and mapping demodulation reference signals (DM-RS) to optimize PDSCH scheduling, allowing for efficient resource allocation and reduced interference in 5G standalone and non-standalone networks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If repetitive transmission of DCI is used to ensure reliable scheduling, then reliability of PDSCH scheduling is improved, but device complexity and processing overhead increase

Engineering Contradiction:

Improvereliability of PDSCH schedulingVSAvoidprocessing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the DCI transmission into multiple repetitions across different time slots, where each repetition contains scheduling information for a portion of the total data. This segmentation allows the receiver to accumulate complete scheduling information from multiple smaller DCI transmissions, improving reliability without requiring a single complex large DCI message.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements periodic repetition of DCI transmissions at regular intervals (e.g., every K time slots). This periodic action ensures that scheduling information is transmitted multiple times at predetermined intervals, allowing the receiver to combine information from multiple periodic transmissions to achieve reliable scheduling while maintaining a regular, manageable transmission pattern.

Inventive Principle:

Principle #19Periodic action

2Adaptability or versatility

If dynamic resource allocation is implemented to adapt to varying traffic conditions, then adaptability is improved, but interference and data loss increase

Engineering Contradiction:

Improveadaptability to traffic conditionsVSAvoidinterference and data loss

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by transmitting DCI information in advance before the actual data transmission begins. The repetitive DCI transmissions provide advance scheduling information that allows the receiver to prepare for upcoming data transmissions, reducing the risk of interference and data loss while maintaining adaptability to varying traffic conditions through dynamic resource allocation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements beforehand cushioning by repeating DCI transmissions multiple times before the data transmission starts. This repetition creates a cushion of redundant scheduling information that can compensate for potential interference or transmission failures, ensuring that the receiver has sufficient accurate scheduling information even if some DCI transmissions are corrupted or lost.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Adaptability or versatility

If multiple services are supported simultaneously, then versatility is improved, but interference between services increases

Engineering Contradiction:

Improvesupport for multiple servicesVSAvoidinterference between services

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by assigning different repetition patterns and timing configurations to different services based on their specific requirements. Each service can have customized DCI repetition parameters (e.g., different repetition counts, time slot allocations, and frequency resources), allowing the system to support multiple services simultaneously while minimizing interference through service-specific localized optimization.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12543196B2Method and device for transmitting downlink data as repeated downlink control information in wireless communication system

Publication Date: 2026.02.03 SAMSUNG ELECTRONICS CO LTD

AI summary

The present disclosure relates to a 5th generation (5G) or 6th generation (6G) communication system for supporting a higher data rate. A method performed by a user equipment (UE) in a wireless communication system is provided. The method may include: receiving, from a base station (BS), a radio resource control (RRC) message including a parameter associated with using a start symbol of a physical downlink control channel (PDCCH) monitoring occasion as a reference of a start and length identifier value (SLIV); determining, based on the parameter, when a physical downlink shared channel (PDSCH) is scheduled by downlink control information (DCI) transmitted via repetitive first PDCCH candidate and second PDCCH candidate, a reference symbol associated with a start symbol of the PDSCH by using the second PDCCH candidate starting after the first PDCCH candidate; and receiving, based on the reference symbol, downlink data via the PDSCH from the BS.