Wi-5: Advanced Features for Low-cost Wi-Fi APs
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The Wi-5 project aims to create a low-cost architecture for smart Wi-Fi access points (APs) that minimizes interference and optimizes connectivity without altering existing Wi-Fi standards. It includes the development of use cases in various environments such as airports and dense buildings, and features like optimal frequency planning and seamless handover through a light virtual access point (LVAP). The project is partially funded by the EU's Horizon 2020 program and emphasizes scalability and open-source solutions.
Wi-5: Advanced Features for Low-cost Wi-Fi APs
- 1. Wi-5: Advanced Features for Low-cost Wi-Fi APs GAIA RG Meeting @ IETF-96 Berlin, Germany July 21, 2016 Jose Saldana, Julián Fernández-Navajas (University of Zaragoza) 15/07/2016 Wi-5 Project, http://www.wi5.eu/ 1
- 2. Objectives of the Project The Wi-5 Project (What to do With the Wi-Fi Wild West) proposes an architecture based on an integrated and coordinated set of smart Wi-Fi APs: • To efficiently reduce interference between neighboring Wi-Fi APs and provide optimized connectivity. • To develop new business models to support this. Solutions must be able to run: • On the operator’s APs (low cost). • On top of the existing PHY and MAC Wi-Fi layers (no modifications to 802.11 are considered). 15/07/2016 Wi-5 Project, http://www.wi5.eu/ 2
- 3. Use cases • Airport/train station • Dense apartment building • Pico-cell street deployment • Large home/SOHO: multiple APs in the same property • Community Wi-Fi: Creating 2 SSIDs and 2 VLANs, one private and one public 15/07/2016 Wi-5 Project, http://www.wi5.eu/ 3 Gateway AP AP
- 4. Solutions being developed Shared in https://github.com/Wi5 Objective: An open-source and low cost platform supporting advanced features currently available in enterprise-grade Wi-Fi APs: • Optimal frequency planning • Load balancing • Seamless handover • Transmit power control • Intelligent frame/packet grouping • Interference measurement The solutions must be scalable. 15/07/2016 Wi-5 Project, http://www.wi5.eu/ 4
- 5. Concept of Light Virtual Access Point (LVAP) • A central controller (an OpenFlow SDN controller) creates an LVAP (Light Virtual AP) for each terminal, which is dynamically assigned to the physical AP where the terminal is located at each moment. • The AP will use a different LVAP (which includes a specific MAC) for communicating with each terminal. • The terminal will only “see” a single AP, even if it is actually moving between a number of them, thus avoiding the need for re-association. • Odin* is being extended. 15/07/2016 Wi-5 Project, http://www.wi5.eu/ 5 Client 2 2 Client 2 LVAP2LVAP2 1 Controller LVAP1 Client 1 * J. Schulz-Zander, L. Suresh, N. Sarrar, A. Feldmann, T. Hühn, R. Merz, “Programmatic orchestration of wifi networks,” in USENIX Annual Technical Conference (USENIX ATC 14), pp. 347-358, Jun 2014.
- 6. Example: Seamless Handoff A reactive application that manages the handover of a STA (Station), when the user is moving. • The origin AP detects the movement and reports it to the controller (2) • The controller sends a scan request to the destination AP (3) • The controller makes a decision, and moves the STA to the destination AP (7 and 8). • The STA only “sees” a channel switch, not a re-association. It only takes 20-100 ms. 15/07/2016 Wi-5 Project, http://www.wi5.eu/ 6 STA Channel A Channel B CSA 7 3 STA LVAPLVAP 2 PUBLISH 5 Resource management algorithm STA Switch to channel B Add LVAP 1 4 Scan response Remove LVAP 6 Scan request 8 Send CSA 8 8 AP1 AP2 Burst of beacons
- 7. Seamless Handoff results Two machines are generating traffic of a real-time online game. The delay mainly corresponds to the wireless technology, and does not significantly increase around the handoff (numbers in red are the number of packets lost in a handoff). 15/07/2016 Wi-5 Project, http://www.wi5.eu/ 7 Delay of Quake 3 packets when no background traffic is present. Beacon interval 10ms
- 8. THANK YOU VERY MUCH http://www.wi5.eu/ https://github.com/Wi5 15/07/2016 Wi-5 Project, http://www.wi5.eu/ 8 European Union Horizon 2020 This work has been partially financed by the EU H2020 Wi-5 project (G.A. no: 644262), and the Spanish Ministry of Economy and Competitiveness project TIN2015-64770-R, in cooperation with the European Regional Development Fund.