5G NR LTE Spectrum Sharing Coexistence Mechanism
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Solution Overview
Problem
Current wireless communication technologies lack mechanisms for spectrum sharing between 5G/NR and LTE systems, leading to collisions between Demodulation Reference Signals (DMRS) and Cell-specific Reference Signals (CRS), which degrade signal quality and hinder efficient channel estimation.
Innovation Solution
Implementing coexistence mechanisms that allow 5G/NR systems to avoid collisions with LTE CRS symbols by signaling and rate matching around LTE CRS patterns, ensuring efficient channel estimation and coexistence in shared licensed or unlicensed frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 5G/NR and LTE systems operate on the same frequency band without coexistence mechanisms, then spectrum utilization is improved, but reference signal collisions occur between DMRS and CRS
Solution Approach 1:
The patent segments the time-frequency resources by dividing the spectrum into different component carriers and applying different coexistence mechanisms to each. Specifically, it separates the handling of reference signals by configuring 5G/NR DMRS to avoid time-frequency positions where LTE CRS is transmitted, thereby preventing collisions while maintaining spectrum sharing.
Solution Approach 2:
The patent introduces signaling mechanisms as intermediaries between 5G/NR and LTE systems. Through RRC signaling and other control channels, the system communicates reference signal configuration information between different RATs, enabling coordinated resource allocation and collision avoidance without requiring direct interference management between the systems.
2Adaptability or versatility
If 5G/NR and LTE systems operate on the same frequency band without coexistence mechanisms, then spectrum utilization is improved, but channel estimation accuracy deteriorates
Solution Approach 1:
The patent segments reference signal resources in the time-frequency domain to prevent overlap between 5G/NR DMRS and LTE CRS. By configuring DMRS to be transmitted in different resource elements than CRS, the system ensures that channel estimation for both systems can proceed without interference, maintaining measurement precision while sharing the spectrum.
Solution Approach 2:
The patent applies local quality by making the reference signal configuration adaptive to local conditions. Different component carriers can have different coexistence configurations, allowing the system to optimize channel estimation accuracy for each specific frequency band and deployment scenario while maintaining overall spectrum efficiency.
3Reliability
If rate matching around LTE CRS patterns is implemented in 5G/NR, then reference signal collision avoidance is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring rate matching patterns around LTE CRS positions through higher-layer signaling before data transmission begins. This allows the 5G/NR system to anticipate and avoid reference signal collisions without requiring real-time detection and adaptation, thereby reducing runtime complexity while maintaining reliable collision avoidance.
Solution Approach 2:
The patent enables self-service by allowing the 5G/NR system to autonomously configure its resource allocation based on pre-specified LTE CRS patterns. Through self-organizing network mechanisms and pre-configured parameters, the system automatically adjusts its transmission to avoid collisions without requiring complex real-time coordination between LTE and 5G/NR systems.
Data Source
AI summary
Systems, apparatuses, methods, and computer-readable media, are provided for enabling coexistence between Third Generation Partnership Project (3GPP) Fifth Generation (5G) and Long Term Evolution (LTE) Radio Access Technologies (RATs). Disclosed embodiments enable 5G and LTE to simultaneously operate on the same licensed or unlicensed band such as for spectrum sharing between 5G and LTE RATs. Other embodiments may be described and/or claimed.