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Jan 22, 2023 •524 likes •767 views

SENSEFUL an SDN-based Joint Access and Backhaul Coordination for Dense Wi-Fi Small Cells Eduard Garcia-Villegas , David Sesto-Castilla , Sven Zehl , Anatolij Zubow , August Betzler and Daniel Camps- Mur

  1. SENSEFUL an SDN-based Joint Access and Backhaul Coordination for Dense Wi-Fi Small Cells Eduard Garcia-Villegas ∗ , David Sesto-Castilla ∗ , Sven Zehl † , Anatolij Zubow † , August Betzler ‡ and Daniel Camps- Mur ‡ ∗ † ‡ Universitat Politècnica de Catalunya Technische Universität Berlin i2CAT Foundation, Spain {eduardg, dsesto}@entel.upc.edu {anatolij.zubow, zehl}@tu-berlin.de {daniel.camps, august.beztler}@i2cat.net TKN TKN The Telecommunication Networks Group

  2. SENSEFUL: General Scenario  Dense Small Cell network deployments  Considered one of the main strategies to face current growth of mobile traffic  Poses many interesting challenges  Wi-Fi technology  Ubiquitous technology with important role in future 5G deployments TKN TKN The Telecommunication Networks Group

  3. Motivation  Management of dense small cell deployments  Wired backhaul is not always possible  wireless backhaul.  Access network ( AN ) and backhaul ( BH ) may share radio resources  Increased traffic dynamics (e.g. increased handover frequency)  SDN as key technology to promote adaptability TKN TKN The Telecommunication Networks Group

  4. SENSEFUL: Objectives  Joint SDN-based management of Wi-Fi Access Network and Backhaul Network  Backhaul-aware access network control  Status of backhaul influences QoS offered to STAs  Network controlled association and handover entails creation/modification of optimal backhaul network paths  Access/Backhaul resource management  Centralized scheduling of access network and backhaul network links using hybrid TDMA/CSMA access scheme TKN TKN The Telecommunication Networks Group

  5. SENSEFUL: Objectives  Joint SDN-based management of Wi-Fi Access Network and Backhaul Network TKN TKN The Telecommunication Networks Group

  6. SENSEFUL: Objectives  Joint SDN-based management of Wi-Fi Access Network and Backhaul Network  Backhaul-aware access network control  Status of backhaul influences QoS offered to STAs  Network controlled association and handover entails creation/modification of optimal backhaul network paths  Access/Backhaul resource management  Centralized scheduling of access network and backhaul network links using hybrid TDMA/CSMA access scheme TKN TKN The Telecommunication Networks Group

  7. SENSEFUL: Concepts I  Small Cell “boxes”  Multiple Wi-Fi interfaces for access and/or multi-hop wireless backhaul TKN TKN The Telecommunication Networks Group

  8. SENSEFUL: Concepts II  Small Cell “boxes”  Multiple Wi-Fi interfaces for access and/or multi-hop wireless backhaul  Independent Controllers  Logical entities  SDN paradigm TKN TKN The Telecommunication Networks Group

  9. SENSEFUL: Concepts III  Small Cell “boxes”  Independent Controllers  Enables:  Multi-tenancy (AN and BH with different owners/operators)  Independent evolution of AN and BH technologies  Control plane scalability (AN and BH functions are decoupled)  Joint AN/BH resource optimizations (e.g. load balancing, energy efficiency, resiliency, etc.) TKN TKN The Telecommunication Networks Group

  10. SENSEFUL: Small Cell Backhaul [1] A. Hurtado-Borràs, J. Palà-Solé, D. Camps-Mur and S. Sallent-Ribes, "SDN wireless backhauling for  SDN Small Cells," ICC 2015 architecture to enable Openflow based forwarding in wireless mesh networks using Linux [1] TKN TKN The Telecommunication Networks Group

  11. SENSEFUL: Access Network [2] A. Zubow, S. Zehl and A. Wolisz, "BIGAP — Seamless handover in high performance enterprise IEEE 802.11 networks," NOMS 2016  Access Network based on BigAP approach [2]:  BigAP Soft Handover approach:  Enables infrastructure controlled seamless handover  Seamless Load Balancing  Seamless client STA mobility support  Controlled steering of client association  BigAP exploits the 802.11 DFS functionality and leads the STA to believe that the serving AP will perform a RF channel switch due to a detected radar signal :  BIGAP works with unmodified STAs, i.e. support of 802.11n/ac is sufficient. TKN TKN The Telecommunication Networks Group

  12. SENSEFUL: Backhaul-aware access network control  Access Network / Backhaul control interface based on REST API:  AN  BH: POST new STA to inform of new association. BH responds with metric of its capacity through that AP  Can be used to decide the best candidate AP for a given STA, based on the status of the BH.  AN  BH : PUT new station association information to inform of a network-driven handover.  AN  BH : DELETE station .  BH  AN : POST a suggested handover in order for the BH controller to notify congestion TKN TKN The Telecommunication Networks Group

  13. SENSEFUL: Access Backhaul Resource Management [3] S. Zehl, A. Zubow and A. Wolisz, "hMAC: Enabling Hybrid TDMA/CSMA on IEEE 802.11 Hardware,"arXiv preprint arXiv:1611.05376 2016  Share resources (ISM band) through centralized scheduling using hybrid CSMA/TDMA (ath9k-hMAC [3, 4])  Reduce collisions (reduce contenders per slot and detect/avoid hidden nodes )  Precise QoS policies  Network Slicing [4] https://github.com/szehl/ath9k-hmac TKN TKN The Telecommunication Networks Group

  14. SENSEFUL: Testbed Experiments  Prototypical Implementation of SENSEFUL with experiment setup:  Backhaul / Access Node Setup:  Client STA Setup: INTEL NUCs (i5@1.3GHz, 4GB RAM) TP-Link WDR4300 AP/BH   2x Atheros IEEE 802.11n NICs, ath9k-hmac X Samsung Galaxy Tab S2   1x ethernet for remote experiment (COTS / DFS Support) TKN TKN The Telecommunication Networks Group

  15. SENSEFUL: Testbed Experiments  Features under test:  Association/handover decisions based on backhaul status  Backhaul capacity to detect congestion and suggest favorable handovers  Creation of optimized backhaul flows upon notification from access network controller  Centralized TDMA scheduling to fairly distribute resources between access network and backhaul network TKN TKN The Telecommunication Networks Group

  16. SENSEFUL: Testbed Experiments  Exemplified through a sequence of events (storyline):  Compared against a “legacy” approach (no cooperation between access and backaul network)  Measured in terms of downlink (TCP) throughput and (Jain) fairness TKN TKN The Telecommunication Networks Group

  17. SENSEFUL: Results step by step 17 STA1 is switched on (only reaches AP1)  ANc handles association and notifies BHc (AP1)  BHc computes optimal path from STA1 to core  STA2 is switched on (sees AP1 and AP2)  ANc handles association and notifies BHc (AP2)  BHc computes optimal path from STA2 to core  STA3 is switched on (only reaches AP3)  ANc handles association and notifies BHc (AP3)  BHc computes optimal path from STA3 to core  SENSEFUL approach activates hMAC (TDMA)  Proportional to carried flows  thr. SENSEFUL thr. SENSEFUL thr. SENSEFUL thr. Legacy thr. Legacy thr. Legacy fairness SENSEFUL fairness SENSEFUL fairness SENSEFUL fairness legacy fairness legacy fairness legacy 5000 5000 5000 1 1 1 Throughput [kbps] Throughput [kbps] Throughput [kbps] 4000 4000 4000 0.8 0.8 0.8 fairness index fairness index fairness index 3000 3000 3000 0.6 0.6 0.6 2000 2000 2000 0.4 0.4 0.4 1000 0.2 1000 1000 0.2 0.2 0 0 0 0 0 0 0 0 0 5 5 5 10 10 10 15 15 15 20 20 20 25 25 25 30 30 30 time [s] time [s] time [s] TKN TKN The Telecommunication Networks Group

  18. SENSEFUL: Results step by step 18 STA4,5,6 switched on (only reach AP2)  ANc handles associations and notifies BHc (AP2)  BHc computes optimal path from STAs to core  SENSEFUL reconfigures TDMA slot assignments  SENSEFUL requests a handover  BHc detects congestion and suggests ANc to move STA2  ANc decides handover and notifies BHc (AP1)  BHc computes new optimal path from STA2 to core  SENSEFUL reconfigures TDMA slot assignments  thr. SENSEFUL thr. SENSEFUL thr. Legacy thr. Legacy fairness SENSEFUL fairness SENSEFUL fairness legacy fairness legacy 5000 5000 1 1 Throughput [kbps] Throughput [kbps] 4000 4000 0.8 0.8 fairness index fairness index 3000 3000 0.6 0.6 2000 2000 0.4 0.4 1000 1000 0.2 0.2 0 0 0 0 0 0 5 5 10 10 15 15 20 20 25 25 30 30 time [s] time [s] TKN TKN The Telecommunication Networks Group

  19. SENSEFUL: results step by step 19 TKN TKN The Telecommunication Networks Group

  20. SENSEFUL: Conclusions  Joint management of access network and 20 backhaul network show benefits even in a simple scenario  Network-driven association control helps in reducing backhaul network bottlenecks  Information from backhaul network helps in providing better association decisions (better for STAs and for backhaul network)  The use of TDMA-like access improves fairness  Negative impact on throughput with few competing STAs (worse than legacy CSMA/CA)  Enables multiple network configurations  Differentiate services, Network slicing TKN TKN The Telecommunication Networks Group

  21. BACKUP SLIDES TKN TKN The Telecommunication Networks Group

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