5G NR Intra-Frequency Interference Cancellation via LTE Modem Notification
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Solution Overview
Problem
The transition to 5G NR networks poses challenges for network service providers to concurrently support users of older 4G technologies and new 5G systems within the limited wireless spectrum, leading to increased radio link interference due to distinct radio access technologies and core network functions, with existing interference cancellation techniques being ineffective for 5G serving cells affected by intra-frequency transmissions from neighboring 4G cells.
Innovation Solution
The implementation of a UE-based technique that configures 4G LTE and 5G NR modems to perform interference mitigation by detecting and canceling intra-frequency interference from neighboring 4G LTE signals in 5G NR carriers, utilizing the 4G LTE modem to notify the 5G NR modem of interfering signals and enable LTE CRS interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic spectrum sharing is implemented to support both 4G and 5G networks in the same frequency bands, then network capacity and spectrum utilization are improved, but radio link interference increases due to distinct radio access technologies
Solution Approach 1:
The patent detects interfering 4G LTE signals and converts the harmful interference into useful information by using the 4G LTE modem to identify and characterize the interference, then applying CRS interference cancellation to eliminate it, thereby transforming the harmful co-channel interference into an opportunity for improved 5G NR performance
2Reliability
If existing interference cancellation techniques are used, then some interference mitigation is achieved, but they are ineffective for 5G serving cells affected by intra-frequency transmissions from neighboring 4G cells
Solution Approach 1:
The patent segments the interference cancellation function into two parts: the 4G LTE modem performs detection and identification of interfering signals, while the 5G NR modem performs the actual cancellation. This segmentation allows each modem to operate in its optimized domain, making the interference cancellation effective for 5G NR cells affected by 4G LTE transmissions
3Reliability
If dual connectivity is implemented to leverage both 4G and 5G networks, then network performance and coverage are enhanced, but device complexity increases due to configuring and coordinating multiple modems
Solution Approach 1:
The patent merges the interference detection capability of the 4G LTE modem with the 5G NR modem's signal processing capabilities. By combining these functions in a coordinated manner, the system achieves effective interference cancellation without requiring separate independent systems, thereby reducing overall device complexity while maintaining enhanced network performance
Data Source
AI summary
Systems and methods provide for receiving a cell signal of a frequency band via a 5G/New Radio (5G/NR) carrier, wherein a user device includes a 5G/NR modem and a 4G/Long Term Evolution (4G/LTE) modem; determining that the frequency band is a shared spectrum carrier; forwarding the cell signal from a radio frequency (RF) element of the user device to the 5G/NR modem and the 4G/LTE modem; using, based on the forwarded cell signal, the 4G/LTE modem to identify one or more RF signals from one or more cells, wherein the one or more RF signals include a 4G/LTE carrier in the frequency band; and directing the 4G/LTE modem to notify the 5G/NR modem of the one or more RF signals.