IAB Relay Transmission Power Control for Signal Separation
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Solution Overview
Problem
In relay transmission systems, communication quality deteriorates due to large power differences between signals received by an IAB node, especially when MT and DU signals are mixed or share resources, leading to inadequate signal separation and demodulation issues.
Innovation Solution
The IAB node implements a transmission power control mechanism to adjust the transmission power of upstream and downstream devices based on measured reception power densities, using commands to reduce the power difference between downlink and uplink signals to within a predetermined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the IAB node receives signals simultaneously with both MT and DU functions, then the relay transmission capability is improved, but communication quality deteriorates due to large power differences between downlink and uplink signals
Solution Approach 1:
The patent changes the power parameter of received signals by adjusting transmission power control commands. The IAB node measures reception power densities of downlink and uplink signals, calculates appropriate power adjustments, and sends transmission power control commands to upstream and downstream devices to balance the power levels, thereby resolving the communication quality deterioration caused by large power differences while maintaining simultaneous signal reception capability
Solution Approach 2:
The patent implements a feedback mechanism where the IAB node continuously measures the reception power densities of signals from upstream and downstream devices, compares these measurements, and sends transmission power control commands back to the transmitting devices to adjust their transmission powers. This closed-loop feedback system dynamically maintains power balance between downlink and uplink signals, improving communication quality without sacrificing relay transmission capability
2Device complexity
If MT and DU share an antenna or RF circuit, then device complexity is reduced, but signal separation becomes inadequate leading to demodulation issues
Solution Approach 1:
The patent changes the power parameter of signals to enable adequate separation even when MT and DU share antennas or RF circuits. By measuring reception power densities and adjusting transmission powers of upstream and downstream devices, the patent ensures that signals received by shared resources have comparable power levels, preventing demodulation issues that would arise from large power differences in shared antenna or RF circuit configurations
Data Source
AI summary
A communication device capable of connecting to and communicating with another device using a first function operating as a terminal device and a second function operating as a base station device, the communication device acquires a first reception power density of a signal of a downlink received from an upstream device connected by the first function, acquires a second reception power density of a signal of an uplink received from a downstream device connected by the second function, and transmits a transmission power control command for controlling transmission power of the signal of the downlink to the upstream device, based on the first reception power density and the second reception power density.