Terminal Multi-PDSCH Scheduling Collision Handling

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Solution Overview

Problem

In 5G radio communication systems, collisions between Physical Downlink Shared Channels (PDSCH) and Physical Uplink Shared Channels (PUSCH) with semi-static UL/DL symbols can disrupt data channel reception and transmission, leading to scheduling conflicts and inefficiencies in multi-PDSCH/PUSCH scheduling.

Innovation Solution

A terminal and radio communication system that includes a reception unit for receiving downlink data channels and a control unit that cancels scheduling of collided data channels, determines valid data channels, and manages feedback and retransmissions based on the presence of collisions, ensuring continuous data channel reception and transmission even when collisions occur.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multi-PDSCH/PUSCH scheduling is implemented to increase scheduling flexibility and efficiency, then productivity is improved, but collisions with semi-static UL/DL symbols cause reliability deterioration

Engineering Contradiction:

Improvescheduling efficiencyVSAvoiddata channel reception reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The terminal performs preliminary identification of collision scenarios between dynamically scheduled PDSCH/PUSCH and semi-static UL/DL symbols before actual data transmission. By detecting potential collisions in advance through scheduling information analysis, the terminal can preemptively exclude collided channels from processing, ensuring reliable reception without sacrificing scheduling efficiency

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent converts the harmful effect of collisions into a beneficial filtering mechanism. Instead of treating collisions as errors to be corrected, the system uses collision detection to identify and exclude problematic channels, thereby improving overall system reliability while maintaining the flexibility of multi-PDSCH/PUSCH scheduling

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Device complexity

If collided data channels are included in scheduling processing, then device complexity is reduced, but measurement precision deteriorates due to incorrect feedback determination

Engineering Contradiction:

Improvescheduling processing complexityVSAvoidfeedback determination accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The scheduling processing is segmented into valid channels and collided channels. The terminal separates the processing of downlink data channels into two distinct groups: those that collide with semi-static UL symbols and those that do not. This segmentation allows precise feedback determination for valid channels while excluding collided channels from processing, thereby improving measurement precision without significantly increasing overall device complexity

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20250008510A1Terminal, radio communication system and radio communication method

Publication Date: 2025.01.02 NTT DOCOMO INC

AI summary

A terminal receives a plurality of downlink data channels scheduled by a single downlink control information, and assumes that if any downlink data channel collides with an uplink symbol, the downlink data channel cancelled by the collision is excluded from the specific scheduling.