DL SPS Priority Handling for Overlapping NR-IoT Downlink Resources

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Solution Overview

Problem

Existing wireless communication systems face challenges in managing overlapping resources associated with multiple downlink semi-persistent scheduling (DL SPS) configurations, particularly in New Radio Internet of Things (NR-IIoT), where it is unclear how a wireless device should prioritize which DL SPS assignment to handle based on overlapping resources in the frequency or time domain.

Innovation Solution

The wireless device or network node prioritizes DL SPS assignments based on priority information, such as configuration index, Hybrid Automatic Repeat Request (HARQ) process identifier offset, or transmission parameters, to determine which assignment to decode or transmit data using, thereby managing overlapping resources efficiently without additional processing or control signaling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple DL SPS configurations are used to handle multiple periodic traffic flows, then the system can support more traffic types and improve productivity, but resource overlapping occurs in frequency or time domain causing ambiguity in assignment prioritization

Engineering Contradiction:

Improvetraffic flow handling capabilityVSAvoidresource management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent assigns different priority levels to multiple DL SPS configurations based on parameters such as configuration index, HARQ process identifier offset, or transmission parameters. This parameter-based prioritization allows the system to handle multiple periodic traffic flows efficiently while resolving resource overlapping ambiguities by clearly defining which assignment takes precedence under specific conditions

Inventive Principle:

Principle #35Parameter changes

2Reliability

If additional control signaling is implemented to resolve overlapping resource prioritization, then assignment priority can be clearly defined, but processing overhead and system complexity increase

Engineering Contradiction:

Improveassignment prioritization clarityVSAvoidprocessing overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent enables the wireless device to autonomously determine prioritization among overlapping DL SPS assignments using pre-configured priority information stored in the device. The device compares priority levels associated with different assignments and automatically selects the highest priority assignment without requiring additional real-time control signaling from the network, thereby reducing processing overhead while maintaining clear prioritization

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12568493B2Multiple downlink semi-persistent scheduling configurations for New Radio Internet of Things

Publication Date: 2026.03.03 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method by a wireless device (110) includes receiving a first Downlink Semi-Persistent Scheduling (DL SPS) assignment and a second DL SPS assignment from a network node (160). At least one resource associated with the first DL SPS assignment and at least one resource associated with the second DL SPS assignment are at least partially overlapping. The wireless device compares priority information associated with each of the first DL SPS assignment and the second DL SPS assignment and selects a one of the first DL SPS assignment and the second DL SPS assignment that has a higher priority based on the priority information. The wireless device attempts to decode the Physical Downlink Shared Channel (PDSCH) according to the selected one of the first DL SPS assignment and the second DL SPS assignment that has the higher priority.