Base Station Channel Selection for Interference Suppression
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Solution Overview
Problem
The transmission power of Field Pick-up Units (FPUs) is high, causing inter-channel interference and deteriorating the quality of uplink signals due to simultaneous transmission and reception of downlink and uplink signals across adjacent frequency channels, which affects transmission efficiency.
Innovation Solution
Implementing a time-division-duplex scheme in base stations and terminal apparatuses, where downlink signals are transmitted using one channel and uplink signals are received using a non-adjacent channel within the same frequency band, optimizing channel selection to minimize interference and enhance transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If downlink and uplink signals are transmitted simultaneously using adjacent frequency channels, then transmission efficiency is improved, but inter-channel interference occurs causing deterioration of uplink signal quality
Solution Approach 1:
The frequency spectrum is segmented into multiple channels, and the patent applies further segmentation by dividing the simultaneous transmission into different time slots (DL interval and UL interval) within each frame structure, allowing separate handling of downlink and uplink transmissions on adjacent channels
Solution Approach 2:
The patent implements periodic time-division multiplexing where downlink and uplink signals are transmitted in alternating periodic intervals (frames) on adjacent frequency channels. Each frame contains designated DL intervals and UL intervals, creating a rhythmic pattern that prevents continuous interference while maintaining high overall transmission efficiency
2Power
If high transmission power is used in Field Pick-up Units, then signal coverage and strength are improved, but inter-channel interference increases causing deterioration of uplink signal quality
Solution Approach 1:
The patent uses periodic time-division intervals where high power transmission occurs alternately in DL intervals and UL intervals rather than continuously. This periodic switching allows high transmission power to be maintained when needed while preventing continuous interference accumulation between adjacent channels
Solution Approach 2:
The patent preliminarily assigns specific time intervals (DL intervals and UL intervals) to specific transmission directions before actual data transmission begins. This preliminary arrangement of transmission timing allows high power to be used effectively while pre-preventing interference issues through proper temporal separation
Data Source
AI summary
The base station performs radio communication of a time-division-duplex scheme with a terminal apparatus, using any of a plurality of channels included in each of a plurality of frequency bands, and includes: a channel selector that selects a plurality of use channels to be used for the radio communication; a transmitter that transmits a downlink signal to the terminal apparatus; and a receiver that receives an uplink signal from the terminal apparatus. The transmitter transmits, using at least one of the plurality of use channels, the downlink signal in a transmission interval of the downlink signal, and the receiver receives the uplink signal in the transmission interval of the downlink signal, using another one of the plurality of use channels that is not adjacent to the at least one of the use channels.