Base Station Directivity Control via Pseudo Known Signal Generation
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Solution Overview
Problem
Base stations in LTE communication systems face challenges in improving transmission performance due to limitations in controlling transmission directivity in multiple antennas, which affects communication efficiency with communication terminals.
Innovation Solution
A base station system that includes a communication section for controlling transmission directivity using a scheduling executing section to allocate radio resources and adjust antenna settings based on received signals, including the use of known signals to optimize downlink and uplink communications, and generating pseudo signals for improved array transmission control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station allocates downlink radio resources in frequency bands where known signals are transmitted in uplink, then transmission performance is improved through better directivity control, but interference may occur with uplink known signal reception
Solution Approach 1:
The patent segments the frequency spectrum into distinct uplink and downlink frequency bands, allocating downlink resources in frequency bands that do not overlap with uplink known signal transmission bands. This frequency division segmentation prevents interference while maintaining efficient resource utilization for adaptive array transmission.
Solution Approach 2:
The patent resolves the resource allocation conflict by transitioning from time-domain multiplexing to frequency-domain multiplexing. By allocating downlink radio resources in the frequency dimension rather than solely in the time dimension, the system achieves better directivity control without causing uplink interference.
2Reliability
If the base station uses adaptive array antenna system to control transmission directivity, then transmission performance is improved, but system complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-calculating and storing optimal beamforming weights and directivity patterns for multiple terminal positions before actual transmission. The base station determines transmission directivity based on terminal position information in advance, reducing real-time computational complexity while maintaining high transmission performance.
Solution Approach 2:
The patent uses copying by creating virtual representations of terminal positions and channel characteristics to determine optimal transmission directivity. Instead of complex real-time signal processing, the system copies terminal position information and uses pre-established mapping relationships to control antenna directivity, simplifying the control system.
Data Source
AI summary
When a scheduling executing section allocates a use downlink radio resource including in a frequency direction a frequency band, in which a known signal is not received by an uplink radio resource for known signal, from a downlink radio resource associated with the uplink radio resource for known signal to a communication terminal, a communication section generates a known signal to be received from the communication terminal in a frequency band of the use downlink radio resource in a pseudo manner when performing downlink communication with the communication terminal using the use downlink radio resource. The communication section controls transmission directivity in a plurality of antennas based on a new reception signal obtained by adding the pseudo known signal as a desired wave component to a reception signal that is received in the frequency band of the use downlink radio resource in the uplink radio resource for known signal.