Base Station Pilot Channel Generation for Distributed Wireless Systems
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Solution Overview
Problem
The distributed wireless communications system (DWCS) lacks configurations for synchronization channels (SCH) and pilot channels (PiCH) and antenna selection methods suitable for its architecture, particularly in scenarios where a single frequency is reused across multiple radio access units (RAUs).
Innovation Solution
A base station apparatus generates specific pilot channels by combining different first and second pilot signals for each RAU, and synchronization channels by associating code numbers with RAU and BS numbers, enabling accurate antenna identification and reducing interference, while a mobile station receives and extracts these signals to identify RAU and BS numbers for efficient antenna selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single frequency is reused across multiple radio access units (RAUs) in DWCS, then system capacity and data transmission speed are improved, but pilot channel interference increases
Solution Approach 1:
The pilot channel is segmented into two distinct components: first pilot signals specific to each RAU and second pilot signals common to all RAUs under a BS. This segmentation allows differentiated treatment of pilot signals to reduce interference while maintaining frequency reuse benefits for data transmission.
Solution Approach 2:
Different pilot signal configurations are applied locally to different RAUs. Each RAU uses its own specific first pilot signal while sharing a common second pilot signal, creating localized signal characteristics that reduce interference in frequency-reused environments.
2Measurement precision
If multiple pilot signals are combined for each RAU, then radio propagation path estimation accuracy is improved, but device complexity increases
Solution Approach 1:
The pilot signal is divided into two functional segments: RAU-specific first pilot signals for local channel estimation and BS-common second pilot signals for coordinated multi-point estimation. This segmentation enables accurate propagation path estimation without requiring complex processing of entirely unique pilot sequences.
Solution Approach 2:
Two different pilot signals (first and second pilot signals) are combined to form the complete pilot channel for each RAU. This merging provides diverse signal characteristics that improve propagation path estimation accuracy by capturing different spatial and temporal channel properties.
3Measurement precision
If synchronization channels use code numbers associated with RAU and BS numbers, then antenna identification accuracy is improved, but signal processing time increases
Solution Approach 1:
Code numbers are pre-associated with specific RAU and BS identifiers during system configuration. This preliminary assignment enables direct mapping and quick identification without requiring complex real-time computation, reducing signal processing time while maintaining identification accuracy.
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
The present invention is to provide base station apparatuses and mobile station apparatuses suitable for a configuration of a distributed wireless communications system, configure the distributed wireless communications system, and provide a pilot channel generation method and synchronization generation method suitable for the distributed wireless communications system. Provided are a control signal generating section 13 which generates a plurality of mutually different first pilot signals and a second pilot signal based on control data input from the core network apparatus CN constituting the distributed wireless communications system, combines the first pilot signals and the second pilot signal, and thereby generates specific pilot channels for each of radio access unit apparatuses, and a transmitting section 10 that transmits the specific pilot channels respectively to the radio access unit apparatuses.