Asymmetric Base Station Interface for Bandwidth Reduction
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Solution Overview
Problem
The increasing demand for spectral efficiency in wireless communication systems due to scarce spectrum availability leads to higher bandwidth requirements on digital interfaces between main nodes and remote radio units, making it costly and technically challenging to implement high-bandwidth digital interfaces.
Innovation Solution
An asymmetric functional split is introduced between the main node and the integrated antenna node, where some downlink physical-layer processing functions are integrated into the antenna node, while most uplink processing functions remain in the main node, reducing the bandwidth requirement on the digital interface and maintaining centralized processing for uplink operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If more antennas are added at each node to improve spectral efficiency, then spectral efficiency is improved, but bandwidth requirements on the digital interface increase
Solution Approach 1:
The patent segments the base station into a main node and remote radio units, with further segmentation of physical layer processing functions. Downlink processing functions are integrated into the antenna node while uplink functions remain in the main node, creating a divided architecture that reduces interface bandwidth requirements while supporting multiple antennas for improved spectral efficiency
Solution Approach 2:
The patent introduces a new dimension of functional distribution by separating downlink and uplink processing across different nodes. This asymmetric functional split creates a three-dimensional architecture (spatial distribution + functional distribution + directional separation) that enables spectral efficiency improvements without proportionally increasing bandwidth requirements
2Productivity
If centralized processing is implemented for uplink and downlink, then spectral efficiency is improved, but bandwidth requirements on the digital interface increase
Solution Approach 1:
The patent extracts downlink physical layer processing functions from the main node and integrates them into the remote radio unit. This extraction eliminates the need to transmit full downlink processing data over the digital interface, reducing bandwidth requirements while maintaining centralized control for uplink processing that improves spectral efficiency
3Productivity
If high-bandwidth digital interface is implemented, then spectral efficiency requirements are met, but implementation cost and technical difficulty increase
Solution Approach 1:
The patent applies local quality by optimizing the functional split based on specific processing requirements. Downlink processing with deterministic timing requirements is localized to the antenna node, while uplink processing benefiting from centralized coordination remains in the main node. This localized optimization reduces interface bandwidth requirements and implementation complexity while maintaining spectral efficiency
Data Source
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AI summary
The invention relates to an integrated antenna node 22 for use in wireless communication in a communication system 20, the wireless communication involving uplink and downlink physical-layer processing. The integrated antenna node 22 is adapted to perform, for at least one set of corresponding uplink and downlink physical-layer processing functions, only the uplink physical-layer processing functions or the corresponding downlink physical-layer processing functions. The invention further relates to a main node 21, a radio base station 28, computer programs and computer program products.