RRH Signal Switching Unit for Hard-Decision Decoding
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Solution Overview
Problem
Conventional SPP signal transmissions unnecessarily increase transmission data volume between RRHs and BBU by sending LLR values for all signals, even when CoMP is not required, leading to inefficiency.
Innovation Solution
A signal switching unit determines the output path for LLR values based on whether CoMP is needed, routing signals for which CoMP is not performed as signal bit data instead of LLR values, reducing unnecessary quantization and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LLR values are transmitted for all signals between RRH and BBU, then the reliability of signal processing is improved, but the transmission data volume increases unnecessarily when CoMP is not required
Solution Approach 1:
The patent applies local quality by differentiating the processing path based on the specific service type: hard decision decoding is used for eMBB services while soft decision decoding is used for uRLLC services. This allows each signal to receive the appropriate processing quality level rather than uniformly applying soft decision decoding to all signals, thereby reducing unnecessary data transmission for eMBB while maintaining reliability where needed.
2Measurement precision
If soft-decision demodulation is used to output LLR values, then the measurement precision of signal bits is improved, but the device complexity increases due to additional processing paths
Solution Approach 1:
The patent segments the processing system into two distinct paths: a hard decision decoding path for eMBB services and a soft decision decoding path for uRLLC services. The base station includes separate decoding units for each path, allowing independent processing without requiring full soft decision capability in all components. This segmentation reduces overall device complexity while maintaining measurement precision where required.
3Quantity of substance
If hard decision decoding is used for eMBB services, then the transmission data volume is reduced, but the measurement precision of signal bits deteriorates compared to soft decision decoding
Solution Approach 1:
The patent changes the decision parameter based on service type: for eMBB services, it uses hard decision decoding (binary 0/1 output) to minimize data volume, while for uRLLC services, it uses soft decision decoding (LLR value output) to maximize measurement precision. This parameter change approach allows the system to optimize for the appropriate metric depending on the specific service requirements rather than using a fixed processing method.
Data Source
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AI summary
A radio communication system includes a radio apparatus and a signal processing apparatus that function as a base station, and the radio apparatus includes a channel estimation unit that, on the basis of a radio signal transmitted from a terminal apparatus, estimates channel information relating to a radio transmission path between the radio apparatus and the terminal apparatus; a demodulation unit that performs soft-decision demodulation of the radio signal on the basis of the channel information estimated by the channel estimation unit; a signal switching unit that, depending on the terminal apparatus that transmitted the radio signal, switches an output destination of a log likelihood ratio obtained by the soft-decision modulation between either a first path passing through a decoding unit that decodes the log likelihood ratio or a second path not passing through the decoding unit; and a transmission unit that transmits a signal output from the first path or the second path to the signal processing apparatus.