Dynamic Spectrum Sharing Control Channel Signaling

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Solution Overview

Problem

Current wireless communication systems face challenges in dynamically managing spectrum sharing between multiple radio access technologies (RATs), particularly in ensuring efficient downlink control channel reception when there is an overlap with signals from different RATs, leading to potential performance degradation and increased power consumption.

Innovation Solution

The implementation of dynamic spectrum sharing techniques, including bandwidth part adaptation and intelligent configuration of wireless devices to avoid interference, such as rate matching around non-scheduled resources like LTE CRS, and using configuration parameters like frequencyShift7p5khz and rateMatchPatternToAddModList, allows for seamless coexistence and scheduling of NR and LTE signals, ensuring reliable synchronization and resource allocation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If dynamic spectrum sharing is implemented between multiple RATs, then spectrum utilization efficiency is improved, but control channel reception reliability deteriorates due to signal overlap and interference

Engineering Contradiction:

Improvespectrum utilization efficiencyVSAvoidcontrol channel reception reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segments the control channel transmission by dividing it into scheduled resources and non-scheduled resources. Rate matching is applied around non-scheduled resources (such as LTE CRS regions) to avoid interference, while scheduled resources maintain normal transmission. This segmentation allows dynamic spectrum sharing to proceed while protecting control channel reliability in critical regions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies different transmission qualities to different spatial regions by implementing rate matching around non-scheduled resources in specific geographic areas where interference occurs. The downlink control information is transmitted with higher reliability in regions affected by RAT overlap while maintaining spectrum sharing efficiency in other regions, creating local quality differentiation to resolve the contradiction.

Inventive Principle:

Principle #3Local quality

2Productivity

If spectrum sharing between NR and LTE is implemented, then frequency resource efficiency is improved, but power consumption increases due to continuous monitoring and interference management

Engineering Contradiction:

Improvefrequency resource efficiencyVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent applies rate matching around non-scheduled resources in advance before actual control channel transmission. By pre-configuring the rate matching patterns around LTE CRS and other non-scheduled resources, the system avoids the need for continuous real-time interference monitoring and dynamic adjustments, thereby reducing power consumption while maintaining frequency resource efficiency.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If rate matching around non-scheduled resources is implemented, then control channel reliability is improved, but device complexity increases due to additional configuration parameters and processing

Engineering Contradiction:

Improvecontrol channel reliabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements dynamic rate matching where the rate match pattern configuration is adapted based on actual spectrum sharing conditions. The network can dynamically adjust the rate matching parameters around non-scheduled resources according to traffic patterns and interference levels, allowing the system to maintain control channel reliability while managing device complexity through adaptive rather than static configuration.

Inventive Principle:

Principle #15Dynamics

4Adaptability or versatility

If bandwidth part adaptation is used for spectrum sharing, then spectrum flexibility is improved, but synchronization reliability deteriorates due to potential misalignment between RATs

Engineering Contradiction:

Improvespectrum flexibilityVSAvoidsynchronization reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies rate matching around non-scheduled resources specifically in the bandwidth parts where NR and LTE spectrum sharing occurs. By locally adapting the rate matching configuration in the affected bandwidth parts while maintaining normal operation in other parts, the system achieves spectrum flexibility through bandwidth part adaptation while preserving synchronization reliability in the shared regions through targeted rate matching protection.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20230354391A1Capability Signaling for Dynamic Spectrum Sharing

Publication Date: 2023.11.02 PANPSY TECHNOLOGIES LLC

AI summary

A wireless device may transmit capability IE(s) indicating that the wireless device supports reception of a downlink control channel, of a second radio access technology, in resource element(s) associated with a reference signal of a first radio access technology. The wireless device may receive, in response to transmitting the capability IE(s), the downlink control channel in the resource element(s).