Group Common DCI for SPS Cancellation Overhead Reduction

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Solution Overview

Problem

In wireless communication systems, semi-persistent scheduling (SPS) increases control signaling overhead due to the need for individual scheduling information transmission for each user equipment (UE), which can be inefficient as the number of UEs increases.

Innovation Solution

A base station associates UEs into groups and transmits group common downlink control information (DCI) for cancelling SPS occasions, reducing the number of individual DCI transmissions by using a group common SPS cancellation mechanism.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If individual DCI transmissions are sent to each UE for SPS cancellation, then each UE receives accurate scheduling information, but control signaling overhead increases significantly

Engineering Contradiction:

Improvescheduling information deliveryVSAvoidcontrol signaling overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent combines multiple individual DCI transmissions into a single group common DCI transmission. The base station groups multiple UEs together and sends a unified cancellation indication containing bitmap fields that represent cancellation status for each UE in the group, thereby reducing control signaling overhead while maintaining reliable information delivery to all UEs.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The group common DCI structure serves multiple UEs simultaneously with a universal transmission format. The DCI includes a common cancellation indication that can be interpreted by multiple UEs based on their group membership, making a single transmission serve multiple functions that would otherwise require separate individual transmissions.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Quantity of substance

If group common DCI is used for SPS cancellation, then control signaling overhead is reduced, but individual UE scheduling flexibility decreases

Engineering Contradiction:

Improvecontrol signaling overheadVSAvoidindividual UE scheduling flexibility

Core Design Contradiction:

Quantity of substanceVSAdaptability or versatility

Solution Approach 1:

The group common DCI is segmented into multiple fields, including a common cancellation indication field and UE-specific bitmap fields. This segmentation allows the transmission to convey both group-level cancellation information and individual UE-specific scheduling details, maintaining adaptability while reducing overall overhead compared to fully individualized DCI transmissions.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12532322B2Semi-persistent scheduling cancellation via group common control information

Publication Date: 2026.01.20 QUALCOMM INC

AI summary

A base station may associate multiple user equipment (UEs) with one or more UE groups and generate group common downlink control information (DCI) for each UE group for semi-persistent scheduling (SPS) cancellation, such that group common DCI may be transmitted to UEs of a respective UE group. The base station may associate each of UEs with a respective UE group, wherein the UEs are configured with SPS configurations by the base station, each SPS configuration configuring respective SPS occasions. The base station may further determine to cancel one or more SPS occasions associated with at least one of the SPS configurations, generate one or more group common DCI for the one or more UE groups to cancel the one or more SPS occasions, and transmit the one or more group common DCI to one or more UEs associated with the at least one of the SPS configurations.