Control Node Dynamic RRH Association for Interference Management
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Solution Overview
Problem
Conventional Cloud Radio Access Network (CRAN) architectures face challenges in managing interference between antenna domains, backhaul capacity constraints, radio resource limitations, and processing limitations, particularly in forming and re-forming optimal antenna domains to minimize interference and balance load effectively.
Innovation Solution
A control node with a transceiver and processor that receives and processes Channel State Information (CSI) to determine and re-determine associations between Remote Radio Heads (RRHs) and user devices, enabling the formation and re-formation of antenna domains to minimize interference leakage and optimize system performance through mechanisms like status information retrieval, computation of new formations, and implementation of these changes across the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If RRH clustering is used to reduce backhaul requirements, then device complexity and backhaul capacity are reduced, but interference management between antenna domains becomes more difficult
Solution Approach 1:
The control node receives feedback information from user devices about channel state information and interference levels. This feedback is used to dynamically adjust the association between RRHs and control nodes, and to coordinate transmissions across antenna domain boundaries, thereby managing interference while maintaining the benefits of RRH clustering
Solution Approach 2:
The control node acts as an intermediary between RRHs in different antenna domains. It coordinates the transmissions of RRHs that serve the same user device even when those RRHs belong to different antenna domains, enabling interference management without requiring full grand coalition across all domains
2Productivity
If dynamic RRH-to-AN associations are implemented, then system throughput and interference management are improved, but processing complexity and computational requirements increase
Solution Approach 1:
The system segments the network into multiple antenna domains, each with its own control node. The overall association problem is divided into smaller sub-problems that can be solved independently at each control node, reducing the computational complexity compared to a centralized approach while still enabling dynamic optimization
Solution Approach 2:
The association between RRHs and control nodes is made dynamic rather than static. Control nodes can re-determine associations based on changing channel conditions and interference levels, allowing the system to adapt to varying conditions and maximize throughput while managing complexity through localized decision-making
3Reliability
If tight synchronization of multiple base stations is used for coordinated multi-point transmission, then cell-edge user performance is improved, but device complexity and synchronization requirements increase
Solution Approach 1:
The patent merges the functionality of multiple base stations into a coordinated multi-point transmission system where multiple RRHs can simultaneously serve the same user device. By using control nodes to manage the associations, the system achieves coordinated transmission benefits while reducing the synchronization complexity compared to traditional CoMP approaches
Data Source
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AI summary
The invention relates to a control node. The first control node (100) comprises a transceiver (102) configured to receive a first set of Channel State Information, CSI, comprising CSI for radio channels between a plurality of first remote radio heads (410a, 410b,..., 410n) and a plurality of user devices (500a, 500b,..., 500n), a processor (104) configured to determine a 5 first association (110) based on the first set of CSI, wherein the first association (110) comprises an association between the plurality of first remote radio heads (410a, 410b,..., 410n) and the first control node (100). Furthermore, the invention also relates to a corresponding method, a cellular wireless communication system, a computer program, and a computer program product.