Partial Centralization Base Station Uplink CoMP via Likelihood
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Solution Overview
Problem
In wireless communication systems, particularly in mobile communication systems, the full centralization configuration leads to a significant reduction in transmission rate due to signal interference at the edge of cells, and the partial centralization configuration cannot perform uplink CoMP (Coordinated Multi-Point) transmission effectively.
Innovation Solution
In a partial centralization system configuration, likelihood calculation is performed at each remote unit using only the reception signal and channel information available locally, and the likelihood information or log likelihood ratio information is collected and combined to enable uplink CoMP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full centralization configuration is used, then the system can perform uplink CoMP transmission, but the transmission capacity required between the central unit and remote units becomes extremely large
Solution Approach 1:
The patent segments the signal processing function into two parts: RF signal reception remains at the remote unit, while only the baseband signal (extracted from the RF signal) is transmitted to the central unit. This segmentation reduces the transmission capacity requirement while maintaining uplink CoMP capability, as the baseband signal contains only the essential information needed for coordinated multi-point processing.
Solution Approach 2:
The patent extracts the baseband signal from the RF signal at the remote unit before transmission to the central unit. By taking out only the necessary baseband component and leaving the full RF signal processing at the remote unit, the system achieves uplink CoMP with reduced transmission capacity requirements between the central unit and remote units.
2Quantity of substance
If partial centralization configuration is used, then the transmission capacity between the central unit and remote units is reduced, but the system cannot perform uplink CoMP transmission
Solution Approach 1:
The patent applies segmentation by dividing the processing architecture such that the remote unit performs RF signal reception and baseband extraction, while the central unit performs coordinated multi-point processing on the extracted baseband signals from multiple remote units. This segmented approach enables uplink CoMP in a partial centralization configuration with reduced transmission capacity requirements.
Solution Approach 2:
The patent introduces the baseband signal as an intermediary between the RF signal at the remote unit and the CoMP processing at the central unit. This intermediary form (baseband signal) carries the essential information needed for CoMP while requiring significantly less transmission capacity than the original RF signal, thus enabling partial centralization to achieve uplink CoMP capability.
3Reliability
If full centralization configuration is used, then uplink CoMP can be performed, but the system complexity increases due to high transmission capacity requirements
Solution Approach 1:
The patent extracts only the baseband signal from the RF signal at the remote unit for transmission to the central unit. This extraction approach reduces system complexity by minimizing the transmission capacity requirements and the associated hardware complexity, while still enabling uplink CoMP transmission capability through the extracted baseband signals.
Data Source
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AI summary
A base station apparatus is provided with at least one remote unit apparatus each including at least one antenna, and a central unit apparatus connected to each remote unit apparatus via a transmission path. The antenna provided in the remote unit apparatus receives a transmission signal wirelessly transmitted from at least one wireless terminal each including at least one antenna. The remote unit apparatus includes a channel estimation unit that estimates channel information between the antenna of the wireless terminal and the antenna of the remote unit apparatus, using a reception signal received by the antenna provided in the remote unit apparatus, a likelihood calculation unit that calculates likelihood of each transmission signal included in the reception signal, for each antenna provided in the remote unit apparatus, using the channel information estimated by the channel estimation unit, and an inter-unit transmission unit that transmits likelihood information calculated by the likelihood calculation unit to the central unit apparatus. The central unit apparatus is provided with an inter-unit receiving unit that receives the likelihood information transmitted from the inter-unit transmission unit, and a signal detection unit that combines the likelihood information received by the inter-unit receiving unit, and outputs a signal corresponding to each transmission signal transmitted from the wireless terminal, using combined likelihood information.