Radio Alignment Verification Using Channel Estimation
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Solution Overview
Problem
Current methods for verifying relative transmit/receive radio alignment in multi-antenna systems are inadequate, as they rely on insensitive beam pattern comparisons that fail to accurately detect small phase and amplitude errors.
Innovation Solution
A method involving the transmission of reference signals, such as SRS and DM-RS, between a measurement device and a multi-antenna base station, allowing for the estimation and comparison of forward and reverse link vector channels to verify alignment requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beam pattern comparisons are used to verify radio alignment, then the verification process can be performed, but the measurement precision is insufficient to detect small phase and amplitude errors
Solution Approach 1:
The patent replaces the mechanical/geometric beam pattern comparison method with a signal processing-based channel estimation method. By using reference signals (DM-RS, SRS) to estimate channel characteristics and directly compare phase/amplitude parameters, the system achieves higher measurement precision without requiring complex physical measurement equipment. The channel estimation approach substitutes traditional beam pattern analysis with mathematical signal processing techniques.
2Measurement precision
If multiple reference signals are transmitted to improve alignment verification accuracy, then the measurement precision improves, but the use of energy and device complexity increase
Solution Approach 1:
The patent makes existing reference signals (DM-RS for downlink, SRS for uplink) serve the dual purpose of their original function (data transmission assistance) and alignment verification. By reusing these already-transmitted signals for channel estimation and alignment checks, the system achieves high measurement precision without requiring additional dedicated reference signals, thereby avoiding extra energy consumption and device complexity.
Solution Approach 2:
The system uses its own existing reference signal infrastructure to perform alignment verification. The base station and wireless device leverage their own transmitted reference signals to estimate channels and verify alignment, eliminating the need for external verification equipment or additional signaling overhead. This self-service approach maintains precision while minimizing energy use.
3Productivity
If traditional alignment verification methods are used, then the device complexity is low, but the productivity of alignment verification is slow and inaccurate
Solution Approach 1:
The patent introduces channel estimation as an intermediary process between signal transmission and alignment verification. By estimating the channel characteristics from reference signals and using these estimates to determine alignment status, the system achieves fast and accurate verification. The channel estimation acts as a mediator that transforms raw reference signals into actionable alignment information, improving productivity while managing complexity through standardized processing steps.
Data Source
AI summary
Radio alignment of downlink and uplink channels between a wireless device and a multi-antenna base station. A method performed by a network node comprises obtaining downlink channel data, wherein the downlink channel data comprises: estimates of a plurality of downlink channels each associated with a downlink reference signal being received from one of the antennas at the wireless device, and time synchronization information associated with each of the downlink channels; obtaining uplink channel data, wherein the uplink channel data comprises: estimates of a plurality of uplink channels each associated with an uplink reference signal being received at one of the antennas from the wireless device, and time synchronization information associated with each of the uplink channels; comparing the downlink channel data and the uplink channel data to determine whether the downlink channel and uplink channel between the wireless device and the multi-antenna base station are aligned.