6G • RAN
Cell-Free Massive MIMO
Cell-Free Distributed Massive MIMO
A distributed network architecture where base station cell boundaries are eliminated, allowing dozens of distributed access points to serve users cooperatively.
Technical Explanation
In traditional cellular networks, users near cell edges suffer severe performance degradation due to inter-cell interference. Cell-Free Massive MIMO dismantles cell boundaries entirely. A dense fabric of distributed Access Points (APs) connects to Central Processing Units (CPUs) via high-speed fronthaul. Every user equipment (UE) is surrounded by a bespoke cluster of coordinating APs that jointly transmit and receive signals, delivering uniform gigabit throughput regardless of user location.
Key Functions
- Elimination of cell boundaries and traditional handover drops across the coverage area
- Joint coherent transmission and reception across distributed antenna clusters
- Uniform quality of service with 10x-100x improvement in 95%-likely edge throughput
- Dynamic user-centric clustering adapting to user mobility and channel fading
- High resilience against single AP failures or localized beam obstructions
Specifications
ITU-R M.2160, 3GPP Rel-19 Work Item on Distributed RAN, O-RAN Next-Gen
Interfaces
Fronthaul-v2Xn-Cluster6G-Uu
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