Adaptive Beam-Link Construction in High Frequency BDMA Systems
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Solution Overview
Problem
In high frequency band wireless communication systems, increasing the number of antennas to enhance antenna gain results in increased overhead for Channel State Information (CSI) estimation, which is inefficient and can lead to reduced Signal-to-Noise Ratio (SNR) due to signal attenuation and frequent changes in mobile station orientation.
Innovation Solution
The method involves rapidly constructing a beam-link using adaptive beam weight updates based on alternating reference signal transmission between a Base Station (BS) and a Mobile Station (MS), employing beamforming techniques such as Maximal Ratio Combining (MRC) and narrow beam combining, which reduces overheads and improves SNR without requiring separate feedback processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of antennas is increased to enhance antenna gain, then the communication quality is improved, but the overhead for Channel State Information (CSI) estimation is increased
Solution Approach 1:
The patent segments the beamforming process into two distinct phases: initial beam training phase where comprehensive beam pairs are tested, and subsequent beam refinement phase where only the selected beam pair is refined. This segmentation allows the system to achieve high communication quality through beamforming while minimizing CSI estimation overhead by limiting detailed channel state information collection to only the selected beam direction rather than all possible beam pairs.
2Length of stationary object
If beamforming technique is used to increase distance of arrival, then signal attenuation is reduced, but the complexity of beam management is increased
Solution Approach 1:
The patent implements preliminary beam training before actual data transmission, where the base station and mobile station pre-establish the optimal beam pair through reference signal transmission and SNR measurement. This preliminary action determines the best beam directions in advance, allowing the system to maintain simple beam management during data transmission by using the pre-selected beam pair without requiring complex real-time beam switching or management.
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 efficient beam-link construction and updating in high frequency band Beam Division Multiple Access (BDMA) cellular systems, enhancing communication quality even with frequent changes in the mobile station's orientation, while minimizing time and resource usage for reference signal transmission.
Implementation Method 1
Transmit beamforming corresponds to a method of generally concentrating signals transmitted from respective antennas of a plurality of antennas on a particular direction
Implementation Method 2
The receive beamforming corresponds to a technique of concentrating received radio waves on a particular direction to increase the intensity of received signals incident to the corresponding direction
Implementation Method 3
updating the at least one uplink beam by applying a Maximal Ratio Combining (MRC) weight to the at least one uplink beam
Data Source
AI summary
A method of forming a beam-link by a Base Station (BS) in a wireless communication system using a beamforming scheme includes determining at least one downlink beams to be used for downlink transmission and/or reception, transmitting a reference signal to a Mobile Station via the at least one downlink beam, receiving the reference signal via an uplink beam from the Mobile station, and updating the at least one downlink beam to increase a Signal-to-Noise Ratio (SNR). Accordingly, a beam-link using an initial beam-link between the BS and the MS and adaptive beamforming can be rapidly constructed in a high frequency band BDMA cellular system.