Network Access Architecture for MIMO DAS and Near-End TDD Sync
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Solution Overview
Problem
Existing indoor distributed antenna systems (DAS) primarily support Single-Input-Single-Output (SISO) and do not facilitate Multiple-Input-Multiple-Output (MIMO) technology, which is necessary for 5G communication, leading to high renovation costs and difficulties in network transformation, and the demodulation of Time Division Duplex (TDD) switching signals is costly and complex.
Innovation Solution
A network access device with multiple transceiver ports supporting MIMO and SISO modes, along with a synchronization unit for demodulating and analyzing TDD switch signals, enabling flexible networking and reducing the need for costly far-end modules in the DAS system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a new line is arranged to support MIMO technology in 5G networks, then MIMO capability is improved, but renovation cost increases and existing properties are affected
Solution Approach 1:
The patent makes the existing DAS system multi-functional by enabling it to support both SISO (Single-Input-Single-Output) and MIMO (Multiple-Input-Multiple-Output) modes through a single infrastructure. The network access device is configured to handle multiple signal streams simultaneously, allowing the system to adapt to different communication standards (2G, 3G, 4G, 5G) without requiring separate dedicated lines for each technology.
Solution Approach 2:
The system dynamically switches between SISO and MIMO operating modes based on service requirements. The network access device can flexibly allocate radio frequency signals to different ports, enabling dynamic adaptation to varying network demands. This dynamic capability allows the system to provide MIMO functionality when needed while maintaining compatibility with existing SISO infrastructure.
2Adaptability or versatility
If the existing DAS system is abandoned and a new line is arranged, then MIMO support is achieved, but transformation difficulty increases and properties are affected
Solution Approach 1:
The patent incorporates a synchronization unit that performs preliminary demodulation and analysis of TDD switching signals before they reach the remote modules. By preprocessing these signals at the network access device, the system prepares the signal stream in advance, reducing the complexity of signal processing required at remote locations and simplifying the overall transformation process.
Solution Approach 2:
The network access device acts as an intermediary between the core network and the existing DAS infrastructure. It provides the MIMO functionality while interfacing with the legacy SISO-based distributed antenna system, thereby mediating between new technology requirements and existing infrastructure constraints without requiring complete system replacement.
3Ease of operation
If TDD switch signal demodulation is placed in the remote module, then signal processing is distributed, but cost increases
Solution Approach 1:
The patent extracts the TDD switch signal demodulation function from the remote modules and concentrates it in the synchronization unit at the network access device. By removing this complex processing requirement from the remote locations, the system reduces the cost and complexity of remote modules while maintaining distributed signal processing capabilities for other functions.
Data Source
AI summary
A network access device includes: a first signal transceiver port, configured to transmit and receive a first radio frequency signal in a multiple-input-multiple-output manner; a second signal transceiver port, configured to transmit and receive a second radio frequency signal in a single-input-single-output manner; a signal processing unit, configured to filter and to combine and/or split the first radio frequency signal and the second radio frequency signal, the signal processing unit being respectively connected to the first signal transceiver port and the second signal transceiver port; a synchronization unit, configured to demodulate, analyze and modulate the first radio frequency signal and a TDD (Time Division Duplex) switch signal in the second radio frequency signal, the synchronization unit being respectively connected to the first signal transceiver port, the second signal transceiver port, and the signal processing unit.