3D Beam Cell ID Assignment for Interference Reduction
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Solution Overview
Problem
The increase in the number of antenna elements at base stations leads to increased load in beamforming, resulting in higher interference and resource allocation challenges due to limited resource allocation patterns for cell-specific reference signals, which affects communication efficiency.
Innovation Solution
Assigning a cell ID to individual three-dimensional beams allows for handling communication regions as virtual cells, reducing interference by transmitting cell-specific reference signals using a limited portion of resource blocks and controlling the transmission power within specific time and frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antenna elements is increased to improve beamforming performance, then communication capacity is improved, but beamforming load increases
Solution Approach 1:
The patent segments the beamforming process by dividing beams into directional beams (for data transmission) and non-directional beams (for reference signal transmission). This segmentation allows the system to handle different types of signals differently, reducing the overall beamforming load while maintaining communication capacity through selective application of beamforming techniques.
Solution Approach 2:
The patent applies partial beamforming action by transmitting cell-specific reference signals (CRS) using non-directional beams instead of full directional beamforming. This partial approach reduces the computational load and complexity associated with calculating weight coefficients for all signals, while still maintaining adequate communication performance through the use of reference signals for channel estimation.
2Productivity
If cell-specific reference signals are transmitted for each virtual cell, then communication efficiency is improved, but interference between reference signals increases
Solution Approach 1:
The patent inverts the conventional approach by transmitting cell-specific reference signals using non-directional beams instead of directional beams. This inversion allows reference signals to be transmitted without the complex weight coefficient calculations, reducing interference between CRS from different virtual cells while maintaining communication efficiency through proper resource allocation.
Solution Approach 2:
The patent uses copying by transmitting the same cell-specific reference signal pattern across multiple virtual cells using non-directional beams. This allows terminal devices to perform channel estimation effectively while the limited number of resource allocation patterns for CRS is managed through the non-directional transmission approach, reducing inter-cell interference.
3Object-generated harmful factors
If resource allocation patterns for CRS are increased to reduce interference, then interference is reduced, but system complexity increases
Solution Approach 1:
The patent segments resource allocation by assigning specific resource blocks for CRS transmission in a limited portion of the frequency band. This segmentation allows the system to manage CRS transmission efficiently with a limited number of resource allocation patterns, reducing system complexity while maintaining adequate interference management through proper resource isolation.
Data Source
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AI summary
[Object] To make it possible to reduce an increase in the interference while reducing load involved in beamforming. [Solution] There is provided a communication control apparatus including an acquisition unit configured to acquire cell identification information assigned to an individual three-dimensional beam formed by a directional antenna capable of forming a three-dimensional beam, and a control unit configured to control transmission of a reference signal performed using the individual three-dimensional beam, on the basis of the cell identification information. The control unit controls the transmission so that the reference signal is transmitted in a limited portion of available resource blocks.