Beamforming Neighboring Cell Search in 5G Wireless Systems
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Solution Overview
Problem
In 5G wireless communication systems, the increased frequency band leads to radio wave path loss, reducing service coverage and requiring effective techniques to mitigate this, such as beamforming, while also necessitating efficient methods for searching neighboring cells.
Innovation Solution
The use of beamforming techniques, including transmission and reception beamforming, to enhance signal directivity and reduce interference, along with methods for searching neighboring cells by adjusting beam cyclic shifts and window shifts to optimize signal measurement intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If beamforming is used to increase transmission distance and reduce path loss, then signal coverage is improved, but device complexity increases due to the need for multiple antennas and beam management
Solution Approach 1:
The patent segments the beamforming process into separate transmission and reception beamforming operations, allowing independent optimization of each side. The transmission beamforming uses a specific antenna array configuration while reception beamforming uses a different configuration, dividing the complex beam management into manageable segments that can be handled separately by the base station and terminal.
Solution Approach 2:
The patent introduces a new dimension of beam management by implementing beamforming in both transmission and reception directions simultaneously. This bidirectional beamforming approach adds spatial dimensionality to signal processing, creating focused signal paths in both directions to extend transmission distance while managing complexity through structured beam pairs.
2Measurement precision
If beamforming is applied to synchronization and reference signals to overcome path loss, then signal reception sensitivity is improved, but the complexity of signal processing and beam alignment increases
Solution Approach 1:
The patent applies preliminary beamforming to synchronization signals and reference signals before actual data transmission. By pre-aligning transmission and reception beams using these pilot signals, the system establishes optimal beam pairs in advance, reducing the complexity of real-time signal processing during data transmission while maintaining high reception sensitivity.
Solution Approach 2:
The patent uses synchronization signals and reference signals as intermediary elements to facilitate beam alignment between transmission and reception sides. These intermediary signals carry beam information that mediates the complex alignment process, allowing the system to determine optimal beam pairs without requiring complex direct coordination during data transmission.
3Productivity
If a wide frequency band is used to increase data transfer rate, then spectral efficiency is improved, but radio wave path loss increases due to higher frequency
Solution Approach 1:
The patent changes the parameter of frequency band usage by utilizing available wide frequency bands while compensating for the inherent path loss through beamforming. The system adapts to higher frequency operations by adjusting beamforming parameters and antenna configurations to maintain signal strength, thereby achieving high data transfer rates despite increased path loss at higher frequencies.
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
Beamforming techniques improve signal coverage and range by reducing path loss, and the proposed methods for searching neighboring cells enable efficient signal measurement, enhancing overall system performance.
Implementation Method 1
the beamforming, massive multiple-input multiple-output (MIMO), Full Dimensional MIMO (FD-MIMO), array antenna, an analog beam forming, large scale antenna techniques are discussed in 5G communication systems
Implementation Method 2
a collection of a plurality of antennas may be referred as an antenna array and each of the antennas included in the array may be referred to as an array element. The antenna array may be configured in various forms such as a linear array, a planar array, and the like. The transmission beamforming increases directivity by focusing a reaching area of radio waves on a specific direction using a plurality of antennas
Implementation Method 3
The receiving end may perform beamforming reception signals using a reception antenna array. The reception beamforming increases sensitivity of reception signals entering in a corresponding direction by focusing the reception of radio waves in a specific direction, and provides a gain of blocking interference signals by excluding signals entering in directions other than the corresponding direction from the reception signals
Data Source
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AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). An apparatus and a method for searching neighboring cells in a wireless communication system are provided. The method includes receiving, from adjacent base stations, a part of a first set of reference signals that are beamformed using different transmission beams arranged in a first order, the part of the first set of the reference signals being received during a first measurement interval in a first time interval, and receiving, from the adjacent base stations, a part of a second set of the reference signals that are beamformed using different transmission beams arranged in a second order, which is different from the first order, the part of the second set of the reference signals being received during a second measurement interval in a second time interval.