Multi-Subband PUSCH/PDSCH Scheduling for Low-Overhead URLLC

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Solution Overview

Problem

In 5G NR-U, the unlicensed spectrum at 5.7 GHz faces challenges with URLLC transmission due to failed Listen Before Talk (LBT) leading to latency issues, hidden node interference affecting reliability, and high control signaling overhead when scheduling multiple PUSCHs or PDSCHs on multiple subbands or carriers.

Innovation Solution

A method for scheduling multiple PUSCHs or PDSCHs with the same time domain resource across multiple frequency resources, using a single DCI format to ensure equal subband allocation and independent LBT per subband, with TB repetition and RRC signaling for enhanced reliability and reduced overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple DCI formats are used to schedule multiple PUSCHs or PDSCHs on multiple subbands or carriers, then the scheduling flexibility and reliability are improved, but the control signaling overhead increases leading to PDCCH capacity blocking

Engineering Contradiction:

ImproveURLLC transmission reliabilityVSAvoidcontrol signaling overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent merges multiple DCI formats into a single DCI format that can schedule multiple PUSCHs or PDSCHs simultaneously. This is achieved by introducing a resource indication value (RIV) that encodes multiple frequency domain resource allocations, allowing one DCI to replace multiple separate DCIs and reduce control signaling overhead while maintaining scheduling flexibility and reliability for URLLC transmissions

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If LBT is performed separately on each subband/carrier, then the spectrum access reliability is improved, but the control signaling overhead increases

Engineering Contradiction:

Improvespectrum access reliabilityVSAvoidcontrol signaling complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the frequency domain resources into multiple subbands or carriers, each requiring independent LBT. The RIV encoding mechanism divides the frequency resources into contiguous groups that can be independently accessed. This segmentation allows separate LBT per subband while using a unified DCI format to manage all segments efficiently, reducing overall control signaling complexity

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If multiple PUSCHs or PDSCHs are scheduled with different time domain resources, then the scheduling flexibility is improved, but the latency for URLLC transmission increases

Engineering Contradiction:

Improvescheduling flexibilityVSAvoidURLLC latency

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent enables periodic or simultaneous transmission by allowing multiple PUSCHs or PDSCHs to be scheduled with the same time domain resources. The RIV encoding facilitates this by indicating multiple frequency domain allocations that can be activated simultaneously or periodically, reducing latency for URLLC while maintaining scheduling flexibility through frequency domain diversity

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS12507224B2Method and apparatus for scheduling physical uplink shared channel (PUSCH) and physical downlink shared channel (PDSCH)

Publication Date: 2025.12.23 LENOVO (BEIJING) LTD

AI summary

A method for scheduling Physical Uplink Shared Charmel (PUSCH) is performed by a user equipment (UE). The method includes receiving a signal scheduling a first number of PUSCHs on a second number of frequency resources, wherein the first number of PUSCHs are scheduled with same time domain resource; and transmitting one or more PUSCHs of the first number of PUSCHs on the second number of frequency resources.