Cooperative Smart Surfaces: The Future of 6G Connectivity
This research, conducted by investigators from the Information Processing and Telecommunications Center (IPTC) at Universidad Politécnica de Madrid (UPM) in collaboration with Universidad de Oviedo, introduces a breakthrough electromagnetic model for managing multiple Reconfigurable Intelligent Surfaces (RIS). As we move toward 5G-Advanced and 6G, these “smart mirrors” are essential for controlling how signals bounce in complex environments.
The study’s primary innovation is its generality: it can calculate signal coverage for any number of RIS units, regardless of their size, orientation, or position. A key finding is that several small, distributed surfaces can work together to achieve performance similar to one large, expensive panel, provided their phases are precisely coordinated. While this cooperation is highly effective for focusing signals on a single user (near-field focusing), the study also notes that shaping broader beams (beam shaping) remains a challenge due to interference patterns.
Potential Applications
- 6G Smart Environments: Enhancing indoor coverage by placing small, unobtrusive RIS units on walls or furniture to eliminate “dead zones”.
- Integrated Sensing and Communications (ISAC): Using wireless signals to simultaneously provide high-speed internet and act as a high-precision radar to detect objects or people.
- Industrial IoT: Precise signal focusing in factories to connect thousands of sensors without interference.
- Satellite & Space Tech: Managing communications for satellites with low-profile, lightweight surfaces.
Ultimately, this study demonstrates that the future of wireless networks lies in cooperation rather than just size. The researchers at IPTC have proven that by using precise phase control, a distributed network of small, low-cost intelligent surfaces can match the performance of much larger, more complex hardware. While challenges remain in perfecting beam shaping over wide areas, this model provides a versatile and scalable framework for deploying “smart” environments. It marks a significant step toward a world where our walls and objects work together to ensure we are always connected, whether for high-speed data or high-precision environmental sensing.
Bibliographic reference:
Vaquero, A.F., Pendás-Recondo, Á., Feito, S.M., & Arrebola, M. Near-Field Focusing and Beam Shaping Through Cooperative RIS for Communications and Sensing in IEEE Wireless Communications Letters, 15, pp. 2085-2089, https://doi.org/10.1109/LWC.2026.3670480
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