PDCCH PDSCH Subframe Timing for Wireless Throughput

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Solution Overview

Problem

The increasing number of user equipment (UEs) and data/control information in wireless communication systems necessitates a more efficient method for transmitting and receiving data using limited radio resources, particularly for smart devices that require efficient transmission of small amounts of data at low frequencies.

Innovation Solution

A method where the physical downlink control channel (PDCCH) carries information indicating possible start subframes for the physical downlink shared channel (PDSCH), allowing the UE to receive PDSCH starting from a subframe after the last received PDCCH, based on the ratio of maximum PDCCH repetitions, to optimize data transmission and reception.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the number of PDCCH repetitions is increased to improve coverage and reliability, then the throughput and data transmission efficiency deteriorate due to increased resource consumption

Engineering Contradiction:

Improvecoverage and reliabilityVSAvoidthroughput and data transmission efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements dynamic PDSCH start subframe selection based on the number of PDCCH repetitions. When PDCCH repetition count is high, the PDSCH start subframe is set later to account for extended processing time, while maintaining flexibility to adapt to different channel conditions and traffic requirements, thus balancing reliability and throughput

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of PDSCH start subframe timing based on PDCCH repetition configuration. By dynamically adjusting the start subframe index according to the repetition factor, the system optimizes the trade-off between reliable control channel reception and efficient data channel utilization

Inventive Principle:

Principle #35Parameter changes

2Productivity

If the PDSCH start subframe is set earlier to improve throughput, then the processing time and reliability of control channel reception are insufficient

Engineering Contradiction:

ImprovethroughputVSAvoidcontrol channel reception reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent performs preliminary determination of the PDSCH start subframe based on the PDCCH repetition count before actual data transmission. This advance planning ensures that the UE has sufficient processing time to decode repeated PDCCH messages while minimizing the delay before data transmission begins, thus maintaining both reliability and throughput

Inventive Principle:

Principle #10Preliminary action

3Reliability

If the UE processes multiple PDCCH repetitions to improve reliability, then the processing complexity and power consumption increase

Engineering Contradiction:

Improvecontrol channel decoding reliabilityVSAvoidprocessing complexity and power consumption

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements a mechanism where the UE processes PDCCH repetitions only up to a determined threshold or configured maximum, rather than indefinitely. This partial processing approach maintains reliability by ensuring sufficient decoding attempts while reducing unnecessary processing complexity and power consumption when the control information has already been successfully decoded

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS10405266B2Method and user equipment for receiving downlink control channel, and method and base station for transmitting downlink control channel

Publication Date: 2019.09.03 LG ELECTRONICS INC

AI summary

Information indicating one of possible PDSCH start subframes may be provided to the UE via the PDCCH. The PDSCH corresponding to the PDCCH may be transmitted/received starting from the indicated subframe. The possible PDSCH start subframes may be determined based on the ratio of the maximum number of PDCCH repetitions in the PDCCH search space and may be determined based on the ratio of the number of times related to the PDSCH repetition after the PDCCH search space.