Base Station Location Broadcast for 5G/6G Doppler Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems in 5G and 6G face challenges in correcting Doppler frequency shifts caused by relative motion between transmitters and receivers, leading to degradation of message quality, noise immunity, and interference due to subcarrier crosstalk.
Innovation Solution
A method involving base stations providing location data to user devices, allowing devices to calculate and correct Doppler frequency shifts using artificial intelligence models, and adjusting transmission frequencies accordingly, along with various protocols for different communication scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Doppler frequency shift correction is implemented using traditional methods, then frequency accuracy is improved, but system complexity and computational overhead increase
Solution Approach 1:
The base station provides location data (latitude and longitude) to user devices in advance through SSB messages. This preliminary provision of location information enables user devices to calculate Doppler frequency shifts independently without requiring complex network-side processing, thereby improving frequency accuracy while reducing system complexity
Solution Approach 2:
User devices autonomously calculate their own Doppler frequency shifts using the provided location data and their own velocity information. This self-service approach eliminates the need for complex network-side Doppler correction mechanisms, reducing system complexity while maintaining frequency accuracy
2Measurement precision
If location data is broadcast in every synchronization signal block, then Doppler correction accuracy is improved, but message size and transmission overhead increase
Solution Approach 1:
The patent extracts only the essential location data (latitude and longitude) from the base station and includes it in the SSB messages. By taking out only the necessary information rather than broadcasting complete location details, the patent achieves sufficient Doppler correction accuracy while minimizing message size and transmission overhead
3Measurement precision
If AI models are used for Doppler frequency shift calculation, then correction precision is improved, but processing time and energy consumption increase
Solution Approach 1:
The patent implements AI models selectively based on device capabilities. User devices with sufficient processing power can utilize AI models for enhanced correction precision, while devices with limited capabilities can use simplified calculation methods. This partial application of AI models achieves improved precision for capable devices without imposing excessive processing time and energy consumption constraints on the entire system
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances message reception quality by aligning frequencies to mitigate Doppler effects, improving signal separation and decoding efficiency, particularly for devices with varying capabilities and communication types.
Implementation Method 1
If the transmitter is moving toward or away from the receiver, the as-received signal is frequency shifted (Doppler shifted) relative to the transmitted frequency
Data Source
AI summary
5G and especially 6G are intended to accommodate high-speed mobile user devices and access points such as wireless devices on trains and airplanes, while retaining enhanced mobile broadband eMBB service. Therefore, new resource-efficient, low-complexity procedures are needed for measuring and correcting the Doppler frequency shift. To assist user devices, a base station or access point can periodically broadcast a current geographical location of the base station or access point in a localization message. In some embodiments, the geographical location data can be included in a periodically broadcast system information message, such as unused space of a SSB (synchronization signal block) message or an SIB1 (first system information block) message. User devices can then determine a vector toward the base station or access point relative to the user device location and velocity, and thereby calculate a Doppler correction without a frequency scan or other overhead, according to some embodiments.