Uplink Fronthaul Data Processing for Multi-Operator DAS Coverage
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Solution Overview
Problem
Existing cellular DAS deployments face limitations in providing multi-operator and multi-band coverage due to the need for multiple small-cells, which also require separate powering cables and cannot serve the same sector simultaneously, leading to high costs and inefficiencies.
Innovation Solution
A method for processing uplink fronthaul data using virtual Radio Access Network (RAN) with intelligent switching units and baseband processing units to identify remote units and user-equipment identifiers, enabling flexible connection types, reducing interference, and optimizing capacity management, while introducing 5G's Next Generation Fronthaul Interface (NGFI) paradigm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If small-cell solutions are deployed to provide multi-operator and multi-band coverage, then coverage capability is improved, but device complexity and cost increase rapidly due to the need for multiple small-cells
Solution Approach 1:
The patent merges multiple small-cell functions into a single distributed antenna system where multiple remote units can be served by one intelligent switching unit, which is connected to a single baseband processing unit. This consolidation allows multi-operator and multi-band coverage to be achieved without proportionally increasing the number of baseband processing units, thereby reducing device complexity while maintaining coverage capability.
Solution Approach 2:
The intelligent switching unit serves multiple remote units from a single baseband processing unit, enabling one baseband unit to perform multiple functions across different operators and bands. This multi-functionality approach allows the system to provide comprehensive coverage without requiring dedicated baseband units for each small-cell, thus reducing the overall system complexity.
2Adaptability or versatility
If multiple small-cells are deployed for multi-operator coverage, then coverage capability is improved, but use of energy increases due to separate powering cables for each small-cell
Solution Approach 1:
The patent combines the power distribution infrastructure by serving multiple remote units through a single intelligent switching unit and baseband processing unit. This merging approach reduces the total number of powering cables needed compared to deploying separate powered small-cells for each operator and band, thereby reducing energy infrastructure complexity and power consumption.
3Ease of operation
If standard DAS deployment is used, then installation is simplified, but adaptability is reduced as it is not possible to serve the same sector through different small-cells
Solution Approach 1:
The intelligent switching unit dynamically routes uplink signals from multiple remote units to the baseband processing unit and directs downlink data to the appropriate remote units based on real-time conditions. This dynamic capability allows the same sector to be served through different remote units as needed, providing sector serving flexibility while maintaining the simplified DAS installation architecture.
Data Source
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AI summary
The method (200) for processing uplink fronthaul data in a wireless communications network comprises: receiving a plurality of weighted frequency domain data sets from a plurality of remote units (2), wherein each of the weighted frequency domain data sets is from a respective remote unit (2), and wherein each of the weighted frequency domain data sets has a plurality of weighted samples (step 201); temporally aligning each of the weighted frequency domain data sets to generate a plurality of aligned weighted frequency domain data sets (step 203); computing a sum of the plurality of aligned weighted time and frequency samples to generate a plurality of summed weighted frequency domain data sets (step 205); and transmitting the plurality of summed weighted time and frequency samples (step 206).