Ultra-dense networking

Key Research Areas & Activities

Coordinated Multi-Point (CoMP): Researching how dozens of small access points can serve a single user simultaneously, creating a “moving bubble” of connectivity that follows the user.
Reconfigurable intelligent surface-empowered networking: Designing multi-user schemes that are enabled by reconfigurable intelligent surfaces.
Front-haul/Backhaul Optimization: Developing ultra-high-speed fiber and wireless (mmWave/THz/optical) links to connect these thousands of tiny APs to a central processor without adding latency.
Scalable Signal Processing: Researching distributed algorithms that allow the network to grow to infinite density without the computational complexity becoming impossible to manage.

Handover Skipping: Research into “Intelligent Handover Skipping,” where an AI predicts a user’s path and decides to skip small, temporary cells to avoid the “Ping-Pong effect” (constantly switching back and forth).
Phantom Cells / Virtual Cells: A research activity where the control signals (logic) come from a large Macro station, while the data (payload) comes from a tiny, nearby Small Cell.
Advanced Interference Alignment: Using complex math to “align” interfering signals so they occupy a specific dimension of the radio space, leaving the “clean” dimensions for the actual data.
Beam tracking: Employing machine learning and advanced signal processing approaches to ensure connectivity of mobile users in high-directional systems.

Basestation Sleeping & Awakening: Using ML to predict traffic patterns and put 90% of the small cells into “Deep Sleep” mode during low-traffic hours (like 3 AM in a city center).
Cell Zooming: Researching access points that can physically or digitally “expand” or “shrink” their coverage area to fill gaps when a neighboring access point goes into sleep mode.
Ambient Energy Harvesting: Developing small cells that can run entirely on solar, wind, or even by harvesting energy from the radio waves themselves.

Hybrid Spectrum Access: Researching how UDNs can “borrow” unused spectrum from TV broadcasters or satellite links (Dynamic Spectrum Access) to handle sudden spikes in crowd density.
Spatial Frequency Reuse: Developing techniques to reuse the same frequency every few meters without interference, effectively “multiplying” the available spectrum.