Dynamic CORESET Frequency Offset for PDCCH Timeliness

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Solution Overview

Problem

In the NR communications system, the fixed frequency domain locations of the control resource set (CORESET) lead to delays in sending the physical downlink control channel (PDCCH), preventing timely reception by terminals.

Innovation Solution

Implementing frequency-domain offset processing for the CORESET and its search spaces, allowing them to occupy different locations in the frequency domain over time, thereby improving the timeliness of PDCCH sending and receiving without requiring additional CORESETs or search spaces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If the CORESET frequency domain location is fixed, then the system configuration is simple, but the PDCCH cannot be sent in a timely manner

Engineering Contradiction:

ImprovePDCCH sending delayVSAvoidCORESET configuration complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The CORESET frequency domain location is changed from a fixed static configuration to a dynamic configuration that varies with time. The network side device determines different frequency domain locations for CORESET at different time points, allowing the system to adapt to changing channel conditions and reduce PDCCH sending delays by selecting optimal frequency resources dynamically.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The frequency domain location parameter of the CORESET is changed over time. Instead of using a single fixed frequency location, the system employs multiple frequency domain locations that are selected based on time-varying conditions, thereby improving the timeliness of PDCCH transmission while managing complexity through parameter variation.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If the CORESET frequency domain location is fixed, then the configuration is straightforward, but the terminal cannot receive the PDCCH in a timely manner

Engineering Contradiction:

ImprovePDCCH reception efficiencyVSAvoidsearch space configuration complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The search space frequency domain location is made dynamic by linking it to the time-varying CORESET frequency domain location. The terminal determines the search space location based on the current time and the corresponding CORESET configuration, enabling timely PDCCH reception while the network manages the complexity of configuring multiple search space locations.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The network side device pre-configures multiple frequency domain locations for the search space corresponding to different time points. This preliminary preparation allows the terminal to quickly determine the correct search space location at each time point without complex real-time calculations, improving reception efficiency while controlling configuration complexity.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12075451B2Method of receiving a physical downlink control channel (PDCCH) in a search space associated with a control resource sent (CORESET)

Publication Date: 2024.08.27 VIVO MOBILE COMM CO LTD

AI summary

A receiving method, a sending method, a terminal, and a network side device are provided. In the sending method, when sending to the terminal the physical downlink control channel PDCCH in the search space associated with the CORESET, the network side device performs frequency-domain offset processing on the CORESET and search spaces corresponding to different times or search spaces in the CORESET at a same time in a plurality of manners, to improve timeliness of PDCCH sending.