BBU-Selected pRRU Downlink Transmission to Reduce Latency and Fading
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Solution Overview
Problem
In indoor communication systems, the use of multiple pRRUs leads to latency and frequency selective fading due to different pRRUs transmitting the same downlink signals, resulting in signal distortion and reduced downlink transmission performance.
Innovation Solution
A BBU selects a target pRRU based on air interface measurement reports to send downlink signals, reducing the number of paths and latency, by controlling the RHUB and pRRUs to only use the target pRRU for signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple pRRUs are used to distribute downlink signals, then signal coverage is improved, but transmission latency increases and frequency selective fading occurs
Solution Approach 1:
The patent segments the downlink signal transmission by dividing the cell into multiple sectors, each served by a dedicated pRRU. This segmentation allows signals to be transmitted through optimal paths while avoiding redundant transmissions through multiple pRRUs that cause latency and frequency selective fading.
Solution Approach 2:
The patent applies local quality by selecting specific pRRUs based on terminal device location and channel conditions. Each terminal device receives signals from the most suitable pRRU(s) rather than all pRRUs, optimizing the transmission quality for each local situation while reducing overall latency.
2Reliability
If multiple pRRUs transmit the same downlink signals, then signal redundancy is improved, but frequency selective fading probability increases
Solution Approach 1:
The patent extracts the harmful effect of frequency selective fading by removing redundant signal transmissions through multiple pRRUs. The system identifies and eliminates the harmful factor (frequency selective fading) while maintaining reliability through strategic selection of optimal pRRUs based on channel conditions.
Solution Approach 2:
The patent changes the transmission parameter from transmitting the same signal through all pRRUs to transmitting signals only through selected pRRUs based on channel quality metrics. This parameter change reduces frequency selective fading while maintaining or improving signal reliability.
3Productivity
If multiple pRRUs are used for downlink transmission, then system capacity is improved, but signal distortion increases
Solution Approach 1:
The patent applies dynamics by making the pRRU selection adaptive based on real-time channel conditions and terminal device location. The system dynamically adjusts which pRRUs transmit signals to each terminal, optimizing both system capacity and signal quality without causing distortion from simultaneous transmissions through multiple pRRUs.
Data Source
AI summary
Embodiments of this application disclose a communication processing method. The method includes: a baseband processing unit (BBU) receives an uplink measurement signal sent by a first terminal device. The BBU generates an air interface measurement report based on the uplink measurement signal, where the air interface measurement report includes an air interface channel quality value between the first terminal device and at least one pico remote radio unit (pRRU) in a cell in which the first terminal device is located. The BBU selects a target pRRU from the at least one pRRU based on the air interface measurement report, where a quantity of target pRRUs is less than a quantity of the at least one pRRU. The target pRRU is configured to send a downlink signal of the first terminal device to the first terminal device.