Beam Direction Control Using Terminal Position and Velocity
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Solution Overview
Problem
In millimeter wave or sub-terahertz frequency bands, determining beam directions for communication is challenging due to high propagation attenuation and signal interference, leading to increased time and power consumption in beam search, and reduced communication quality.
Innovation Solution
A communication control apparatus estimates signal delay and Doppler shift amounts from a terminal to wireless communication apparatuses using orthogonal time frequency space modulation, determines the terminal's position and velocity vector, and controls antenna directivity to transmit data signals with reduced interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antenna gain is increased by increasing the number of antenna elements to improve signal reception in millimeter wave band, then communication quality is improved, but the directivity of radio wave becomes strong and the angle range where radio wave can be detected becomes narrow, increasing beam search time
Solution Approach 1:
The system performs preliminary beam search using a first frequency band with wider beam width to identify candidate beam directions before performing refined beam search using a second frequency band with higher antenna gain. This preliminary action reduces the search space for the subsequent refined search, thereby reducing overall beam search time while maintaining communication quality.
Solution Approach 2:
The beam search process is divided into two stages: a first beam search using a first frequency band to identify candidate directions, and a second beam search using a second frequency band to refine the beam direction. This segmentation allows the system to balance between wide coverage for initial search and high gain for precise communication, reducing total search time.
2Productivity
If multiple access points transmit signals to one user equipment simultaneously to increase communication capacity, then communication capacity is improved, but signals from multiple APs interfere with each other and communication quality is deteriorated
Solution Approach 1:
The system applies different frequency bands to different transmission purposes: a first frequency band is used for uplink transmission from UE to AP with wider propagation characteristics, and a second frequency band is used for downlink transmission from AP to UE with higher directivity. This local quality differentiation allows multiple APs to transmit simultaneously with reduced interference while maintaining high communication capacity.
3Measurement precision
If beam search is performed by sweeping beam at maximum output in all directions to detect mutual directions, then beam direction accuracy is improved, but the number of trials increases and power consumption increases
Solution Approach 1:
The system performs partial beam search by identifying candidate beam directions using a first frequency band with lower power consumption, then performs refined beam search only in the identified candidate directions using a second frequency band. This partial action approach achieves sufficient beam direction accuracy while significantly reducing the number of trials and power consumption compared to exhaustive search in all directions.
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 enables spatial multiplexing of data signals, improving communication quality and efficiency by reducing interference and optimizing antenna directivity.
Implementation Method 1
a first estimation means for estimating, for each of a plurality of wireless communication apparatuses, a signal delay amount from a terminal to an antenna of the wireless communication apparatus and a relative velocity between the terminal and the wireless communication apparatus based on a reference signal, which has been subjected to orthogonal time frequency space modulation, received from the terminal by each of the plurality of wireless communication apparatuses
Data Source
AI summary
A communication control apparatus according to the present disclosure includes: a control means for selecting a predetermined wireless communication apparatus closest to a terminal from among a plurality of wireless communication apparatuses based on a position of the terminal and positions of the plurality of wireless communication apparatuses, identifying an estimated position of the terminal when a data signal is to be transmitted from the predetermined wireless communication apparatus based on the position and a velocity vector of the terminal when a reference signal (RS) is received by the predetermined wireless communication apparatus, and controlling the predetermined wireless communication apparatus to transmit the data signal with antenna directivity being oriented in a direction from the predetermined wireless communication apparatus toward the estimated position of the terminal.