Discontinuous PDCCH Time-Domain Allocation for NR-LTE CRS Collisions

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Solution Overview

Problem

In scenarios where New Radio (NR) and LTE coexist, collisions between NR PDCCH symbols and LTE cell-specific reference signals (CRS) occur, leading to reduced reliability of PDCCH transmission due to limited available time-domain resources.

Innovation Solution

Determine discontinuous time-domain symbols using a CORESET signaling parameter to allocate NR PDCCH transmission, avoiding collision points with LTE CRS, thereby ensuring reliable PDCCH transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If continuous time-domain symbols are used for PDCCH transmission, then transmission reliability is improved, but resource waste occurs due to collisions with LTE CRS

Engineering Contradiction:

ImprovePDCCH transmission reliabilityVSAvoidtime-domain resource waste

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent divides continuous time-domain resources into discontinuous segments by identifying and excluding symbols that collide with LTE CRS. The CORESET is segmented to use only non-colliding symbols, transforming a continuous resource allocation into a discontinuous one that avoids harmful collisions while maintaining transmission reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent converts the harmful effect of LTE CRS collisions into a beneficial resource allocation strategy. By identifying which symbols collide with LTE CRS and systematically excluding them from PDCCH transmission, the system transforms the problem of resource collision into an optimized resource selection mechanism that improves overall transmission reliability.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Reliability

If time-domain symbols are added to increase coverage performance, then coverage is improved, but collision with LTE CRS increases reducing reliability

Engineering Contradiction:

Improvecoverage performanceVSAvoidsymbol collision with LTE CRS

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by making different time-domain symbols have different functions: some symbols are designated for PDCCH transmission while others are reserved for LTE CRS or left unused. This local differentiation allows the system to maximize PDCCH coverage in non-colliding symbols while avoiding harmful collisions in other symbols.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent performs preliminary action by pre-identifying which time-domain symbols will collide with LTE CRS before allocating PDCCH resources. The discontinuous CORESET configuration is determined in advance based on LTE CRS patterns, allowing the system to proactively avoid collisions rather than reacting to them after they occur.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If frequency-domain resources are maximized, then transmission capacity is improved, but time-domain resources become insufficient leading to reduced reliability

Engineering Contradiction:

Improvetransmission capacityVSAvoidPDCCH transmission reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent addresses resource insufficiency by transitioning from a two-dimensional resource allocation (frequency and time) to a three-dimensional approach that explicitly considers symbol-level time-domain structure. By adding the dimension of symbol discontinuity and systematically excluding colliding symbols, the system creates additional viable time-domain resources without sacrificing frequency-domain capacity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS12542640B2Time domain resource determination method, device and medium

Publication Date: 2026.02.03 ZTE CORP

AI summary

A method and device for determining a time-domain resource, and a medium are disclosed. The method for determining a time-domain resource includes: obtaining a discontinuous control resource set (CORESET) signaling parameter in New Radio (NR); and determining discontinuous time-domain symbols according to the discontinuous CORESET signaling parameter and transmitting the discontinuous time-domain symbols to a terminal, where the discontinuous time-domain symbols are used as time-domain resources for carrying a physical downlink control channel (PDCCH).