Uplink Signal Aggregation via TRxP Selection
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Solution Overview
Problem
In wireless communication systems with a low user density, summing all uplink signals from multiple transmission reception points (TRxPs) degrades the quality of the aggregated signal due to differences in signal, noise, and interference levels across TRxPs.
Innovation Solution
The system selectively sums uplink signals from a subset of TRxPs determined based on measurements of unique signals transmitted by the TRxPs, improving the quality of the aggregated signal by filtering out weaker signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If all uplink signals from multiple TRxPs are summed, then the coverage area is expanded, but the signal quality deteriorates due to differences in signal, noise, and interference levels
Solution Approach 1:
The system segments the set of TRxPs into a subset based on signal quality measurements. Instead of summing signals from all TRxPs, the base station selects only those TRxPs that meet certain signal strength criteria, thereby maintaining coverage while improving signal quality by excluding weaker signals.
Solution Approach 2:
The patent applies local quality by evaluating and selecting TRxPs based on their individual signal quality characteristics. Each TRxP is assessed based on its specific signal, noise, and interference levels, and only those with acceptable local quality metrics are included in the aggregation, rather than uniformly treating all TRxPs equally.
2Ease of manufacture
If a single BBU is connected to multiple geographically separated TRxPs, then the system becomes more economical, but the fronthaul link bandwidth becomes a bottleneck for aggregated signals
Solution Approach 1:
The system extracts only the necessary TRxP signals that meet quality criteria for aggregation. By selecting a subset of TRxPs rather than aggregating all TRxP signals, the system reduces the data load on the fronthaul link while maintaining economic operation through shared BBU resources.
Solution Approach 2:
The patent changes the parameter of signal aggregation from including all TRxP signals to including only selected signals based on quality thresholds. This parameter change optimizes the balance between system economy and fronthaul link capacity utilization.
3Adaptability or versatility
If TRxPs transmit unique signals for identification, then the system can distinguish between different TRxPs, but the overhead increases
Solution Approach 1:
The system uses partial action by transmitting unique signals only when necessary for TRxP identification and selection. The unique signals are transmitted at specific intervals or under specific conditions rather than continuously, reducing overhead while maintaining the ability to distinguish between TRxPs when needed.
Data Source
AI summary
An aggregation unit includes a transceiver configured to transmit unique signals to a plurality of transmission reception points (TRxPs) for transmission by the plurality of TRxPs and receive uplink signals received by the plurality of TRxPs from a user equipment. The aggregation unit also includes a processor configured to generate a sum of the uplink signals from a subset of the plurality of TRxPs. The subset is determined based on measurements of the unique signals performed by the UE. In some cases, the subset is determined by a baseband unit that receives a measurement report including the measurements performed by the UE. The transceiver is configured to transmit the sum of the uplink signals to the baseband unit over a fronthaul link.