Side-Haul Transport for Uplink Coordinated Multipoint
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Solution Overview
Problem
Existing cellular communication networks face challenges in efficiently performing carrier aggregation using remote distributed units, which limits throughput and interferes with signal reuse across multiple cells.
Innovation Solution
The system configures remote distributed units to establish logical links between cells, enabling carrier aggregation by transmitting data through a central unit over a physical link, thereby enhancing network throughput and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is performed using co-located DUs, then throughput is enhanced, but device complexity and network interference increase
Solution Approach 1:
The invention segments the carrier aggregation function across geographically distributed DUs rather than concentrating it in co-located DUs. Each remote DU independently performs carrier aggregation for its served cells, dividing the overall system complexity into manageable distributed units while maintaining throughput enhancement through multi-cell coordination
Solution Approach 2:
The invention transitions from a two-dimensional co-located DU architecture to a three-dimensional distributed architecture by adding the spatial dimension. Remote DUs are distributed across multiple locations and connected via backhaul links, creating a multi-dimensional network topology that reduces interference while maintaining aggregation benefits
2Productivity
If multiple cells use common DU for carrier aggregation, then UE throughput is enhanced, but signal reuse across cells is interfered with
Solution Approach 1:
Each remote DU implements carrier aggregation with local quality optimization for its specific geographic area and served cells. The distributed architecture allows each location to optimize signal characteristics locally while avoiding the interference that would occur if all cells shared a common DU, as each remote DU handles only its local cell group
Solution Approach 2:
The backhaul connection acts as an intermediary between remote DUs and the core network, enabling coordinated multi-point operation without direct interference between geographically separated cells. This intermediary link allows signal aggregation benefits while maintaining physical separation that prevents harmful interference
Data Source
AI summary
Carrier aggregation between remote DU in a cellular communication network is used to increase throughput to user equipment. In response to user equipment being located in cells of remote DUs, a physical link is created and a logical link between the cells of the DUs. The physical link may be an L2 or L3 network connection. Carrier aggregation is performed with transmission of data over the physical link while latency and status of the physical link is acceptable. A context may be used to facilitate the carrier aggregation, the context including identifiers of the cells as well as addresses (IP, MAC) of the DUs.