Radio Base Station FFT Processor Dynamic Timing Alignment
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Solution Overview
Problem
Detecting signals from UE on the cell border in medium or larger cells (radius of 500m or more) is challenging due to non-aligned signals, leading to interference and difficulty in communication, especially when neighboring radio base stations are not close in proximity.
Innovation Solution
A method where a radio base station assists or requests assistance from neighboring radio base stations to align and process signals from UE, involving timing adjustment and Fourier processing to produce Fourier processed signal information, enabling effective signal detection and decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radio base station uses a single FFT processor to receive OFDM signals, then the device complexity is low, but signals from UE on cell border from neighboring cells arrive non-aligned and cannot be detected
Solution Approach 1:
The patent implements dynamic timing adjustment of the FFT processor to adapt to signals arriving from different time alignments. The FFT processor can be shifted in time to align with UE signals from neighboring cells, enabling flexible reception of non-aligned signals without requiring multiple fixed processors. This dynamic adjustment resolves the contradiction by providing multi-cell detection capability while maintaining a single processor architecture.
2Reliability
If the radio base station increases the number of FFT processors to detect signals from multiple UE with different arrival timings, then the signal detection capability improves, but the device complexity increases
Solution Approach 1:
The patent makes a single FFT processor universal by enabling it to process signals from multiple UE with different arrival timings through dynamic timing adjustment. The same processor can be reconfigured in time to align with different UE signals sequentially, providing multi-functionality without increasing the number of processors. This resolves the contradiction by achieving enhanced detection capability through flexible reuse of a single processor.
3Area of stationary object
If neighboring radio base stations are located at larger distances, then the coverage area increases, but the UE signals arrive non-aligned and detection becomes difficult
Solution Approach 1:
The patent applies dynamic timing adjustment to compensate for the time misalignment caused by larger distances between neighboring base stations. By shifting the FFT processor timing to align with UE signals arriving from distant neighboring cells, the system maintains reliable detection capability even when coverage area is expanded. This resolves the contradiction by enabling large cell coverage while preserving signal detection reliability through adaptive timing.
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
This approach allows for improved signal detection and prevention of lost connections for UE on the cell border, even with fewer Fourier processors, reducing complexity and enhancing communication quality.
Implementation Method 1
FFT (Fast Fourier Transformation) processors are very well suited for receiving OFDM signals, and, albeit also other type of processors for Fourier processing may be used, the FFT processor is one reason why the OFDM technology has been chosen for the LTE
Data Source
AI summary
In cellular radio systems it is a problem to provide service to UE (user equipment) on the cell border. In systems that apply a frequency re-use of one, and OFDM access technology, the uplink direction need be improved. One embodiment of this application relates to a radio base station that is equipped with one or more FFT processor/s in addition to the FFT-processor that is adapted for being adjusted to the timed aligned arrival of signals from UE served by the radio base station. The additional FFT processor/s is adapted for being adjusted to the arrival of one or more signals from UE that are served by other radio base station/s. The radio base station is further adapted to send Fourier processed signal information relating to the UE of the other radio base station/s and thereby assist the other radio base station in signal reception. The application also relates to a method for assisting another radio base station in signal reception, and to a method for receiving assistance from another radio base station in signal reception.