PDCCH Scheduling Offset Control for Low-Delay XR Traffic

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Solution Overview

Problem

Existing energy-saving solutions for wireless communication, such as cross-slot scheduling, cause increased delay for variable-rate periodic services like XR services, and incur high signaling overhead due to DCI switching, which are not suitable for variable-rate periodic services with high energy-saving and low delay requirements.

Innovation Solution

Implementing a specified minimum scheduling offset value for PDCCH within a specified time-frequency resource range to reduce signaling overhead and improve communication efficiency, allowing intra-slot scheduling for variable-rate periodic services and inter-slot scheduling for other services.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If cross-slot scheduling is implemented for energy saving, then energy consumption is reduced, but delay increases for variable-rate periodic services

Engineering Contradiction:

Improveenergy consumptionVSAvoiddelay

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The patent applies dynamics by making the scheduling offset configurable and adaptable. The network device can dynamically adjust the minimum scheduling offset value based on service type, allowing intra-slot scheduling for low-delay requirements (like XR services) and inter-slot scheduling for energy-saving scenarios. This dynamic adjustment resolves the contradiction between energy saving and delay requirements.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of scheduling offset from a fixed value to a configurable parameter that can be adjusted based on service requirements. By allowing the minimum scheduling offset to vary (e.g., offset of 0 for intra-slot scheduling vs. offset > 0 for inter-slot scheduling), the system can optimize between energy consumption and delay performance for different service types.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If DCI switching is used to support different scheduling modes, then scheduling flexibility is improved, but signaling overhead increases

Engineering Contradiction:

Improvescheduling flexibilityVSAvoidsignaling overhead

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent applies local quality by associating different minimum scheduling offset values with different search spaces or control resource sets. Instead of using DCI switching for the entire system, the network can configure specific local regions (search spaces) with specific scheduling offset characteristics, reducing the need for extensive DCI switching and associated signaling overhead while maintaining scheduling flexibility where needed.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12543187B2Communication method, electronic device and storage medium

Publication Date: 2026.02.03 BEIJING XIAOMI MOBILE SOFTWARE CO LTD

AI summary

A communication method is performed to a user equipment, and comprises: determining a first time-frequency resource range; and for a physical downlink control channel (PDCCH) within the first time-frequency resource range, determining a first minimum scheduling offset value associated with the first time-frequency resource range, wherein the first minimum scheduling offset value indicates a minimum value of a time domain offset between a PDCCH transmission and a physical channel transmission scheduled by the PDCCH transmission.