Reference Signal Power Boosting in Massive MIMO Systems
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Solution Overview
Problem
Current mobile communication systems face challenges in accurately measuring channel status between evolved NodeBs (eNBs) and User Equipment (UEs) when using massive MIMO technology, leading to inefficiencies in resource allocation and channel estimation due to limited resources for reference signals.
Innovation Solution
A method and device for transmitting reference signals using uniform power boosting, where zero-power CSI-RS resources are allocated for power boosting of non-zero power CSI-RS, allowing adaptive power control based on the UE's location, enabling accurate channel estimation and improved system throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are transmitted using conventional power allocation in massive MIMO systems, then the system can operate with standard resource allocation, but channel estimation accuracy deteriorates due to limited reference signal resources
Solution Approach 1:
The patent changes the power parameter of reference signals by introducing power boosting for non-zero power CSI-RS resources. This parameter change allows the same reference signal resources to achieve better channel estimation accuracy by increasing their transmission power, thereby resolving the contradiction between limited resources and measurement precision.
Solution Approach 2:
The patent segments the reference signal resources into zero-power CSI-RS resources and non-zero power CSI-RS resources. This segmentation allows different power allocation strategies to be applied to different resource types, enabling power boosting on specific non-zero power resources while maintaining standard allocation on zero-power resources, thus improving channel estimation accuracy without uniformly increasing all reference signal resources.
2Measurement precision
If uniform power boosting is applied to all reference signals, then channel estimation accuracy improves, but system interference increases and resource allocation efficiency deteriorates
Solution Approach 1:
The patent applies local quality by differentiating between zero-power and non-zero power CSI-RS resources, applying power boosting only to non-zero power resources. This localized approach ensures that power enhancement is applied only where needed for channel estimation, avoiding unnecessary interference that would result from uniform power boosting across all reference signal resources.
3Productivity
If adaptive power control based on UE location is implemented, then system throughput improves through optimized resource allocation, but device complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the eNB receives channel status information from the UE and uses this feedback to adaptively control the power of reference signals. This feedback-based adaptive power control allows the system to optimize throughput by adjusting power allocation based on actual channel conditions, while the complexity is managed through standardized feedback procedures already present in LTE systems.
Data Source
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AI summary
Disclosed is a communication scheme and a system therefor, the communication scheme for merging, with IoT technology, a 5G communication system for supporting a data transmission rate higher than that of a 4G system. The present disclosure can be applied to intelligent services (such as smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security, and safety related services) on the basis of 5G communication technology and IoT related technology. A method by which a base station transmits a reference signal in a communication system using a large-scale antenna, according to an embodiment of the present disclosure, comprises the steps of: generating configuration information of a reference signal, which includes power boosting information on reference signals; transmitting the configuration information to a terminal; and transmitting the reference signal and then receiving, from the terminal, channel feedback information estimated on the basis of the configuration information.