Wireless Backhaul Radio Access Unit Using Polarization Multiplexing
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Solution Overview
Problem
Current wireless multiple-input multiple-output (MIMO) communication systems for small cells have high CAPEX and OPEX costs, complexity, and power consumption due to their complex architecture, which limits flexibility in network planning and data rate.
Innovation Solution
An autonomous radio access unit using a wireless backhaul link to a central unit, employing different antenna polarizations or frequencies for independent data links, and TDD-based switching to support MIMO configurations, with digital signal processing performed entirely in the central unit to reduce component count and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate units are used for signal exchange and backhaul communication, then functionality is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent combines the signal exchange unit and backhaul communication unit into a single integrated base station apparatus. The transmitting unit handles both access signals to user terminals and backhaul signals to other base stations, while the receiving unit processes both corresponding received signals. This integration eliminates the need for separate hardware units and their interconnection, directly reducing device complexity and power consumption while preserving full functionality.
2Adaptability or versatility
If separate units are used for signal exchange and backhaul communication, then functionality is improved, but power consumption increases
Solution Approach 1:
The patent integrates both communication functions into a single base station apparatus with unified transmitting and receiving units. This consolidation eliminates redundant hardware components and inter-unit communication overhead, reducing the total power consumption while maintaining the ability to perform both signal exchange with user terminals and backhaul communication with other base stations.
3Productivity
If wireless backhaul link with polarization division is used, then data rate is improved, but device complexity increases
Solution Approach 1:
The patent employs polarization division multiplexing to transmit multiple data streams over the same wireless backhaul frequency resources. By utilizing different polarization states (e.g., vertical and horizontal) as an additional dimension for signal separation, the system achieves higher data rates without requiring additional frequency bands or time slots, thereby avoiding increased device complexity.
Solution Approach 2:
The transmitting unit is designed to handle multiple functions: it transmits access signals to user terminals, receives access signals from user terminals, transmits backhaul signals to other base stations, and receives backhaul signals from other base stations. This multi-functional design eliminates the need for separate dedicated units for each function, reducing component count while supporting high data rates through polarization division.
Data Source
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AI summary
The invention concerns a method for wireless multiple-input multiple-output communication in a communication network comprising a central unit (CU) and a radio access unit (RAU), wherein the central unit (CU) is connected to the radio access unit (RAU) by wireless backhaul connections, different data links (RF1-RF4) between the central unit (CU) and the user terminals (UE4, UE5) via the radio access unit (RAU) are established, and said different data links (RF1-RF4) are established by different polarizations of wireless backhaul signals, different carrier frequencies of wireless backhaul signals, and a time division duplex approach for the wireless connection of the radio access unit (RAU) with the user terminals (UE4, UE5), and a central unit (CU) and a radio access unit (CU) therefor.