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Speed5G Workshop London presentation of the Speed5G MAC framework


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Presentation of the Speed5G RRM framework at the Speed5G Workshop on March 7th 2018 in London

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Speed5G Workshop London presentation of the Speed5G MAC framework

  1. 1. SPEED-5G Project London, March 7th 2018 Benoit Miscopein SPEED-5G MAC innovations
  2. 2. 48 Outline 4 MAC framework to support eDSA 4 SPEED-5G MAC designs description 4 MAC simulation results 4 Conclusion SPEED-5G workshop, London, 07/03/2018
  3. 3. MAC framework 4 eDSA capable MAC framework has been defined ➨ Inter-RAT scheduling done at MAC level, where logical channels are steered on the different air interfaces (aggregation split @ MAC) 49SPEED-5G workshop, London, 07/03/2018
  4. 4. MAC framework 4 eDSA capable MAC framework has been defined ➨ Inter-RAT scheduling done at MAC level, where logical channels are steered on the different air interfaces (aggregation split @ MAC) 50 SoTA : 3GPP LWA SPEED-5G workshop, London, 07/03/2018 HARQ HARQ DL-SCH on CCi ... Segm. ARQ etc Multiplexing UEa Multiplexing UEn Unicast Scheduling / Priority Handling Logical Channels MAC Radio Bearers Security Security... RLC PDCP ROHC ROHC... Segm. ARQ etc ... Transport Channels Segm. ARQ etc Security Security... ROHC ... Segm. ARQ etc ... ... ... ... DL-SCH on CCj HARQ HARQ DL-SCH on CCk ... DL-SCH on CCl HARQ HARQ DL-SCH on CCm ... Segm. ARQ etc Multiplexing UEn Multiplexing UEz Unicast Scheduling / Priority Handling Security... ROHC... Segm. ARQ etc ... Segm. ARQ etc Security Security... ROHC ROHC... Segm. ARQ etc ... ... ... ... DL-SCH on CCn HARQ HARQ DL-SCH on CCo ... DL-SCH on CCp Split MeNB SeNB User-plane split/switch at PDCP
  5. 5. MAC framework 4 eDSA capable MAC framework has been defined ➨ Inter-RAT scheduling done at MAC level, where logical channels are steered on the different air interfaces (aggregation split @ MAC) 51 SPEED-5G proposal SPEED-5G workshop, London, 07/03/2018
  6. 6. MAC framework 52 HMAC LMAC Configuration Sensing&measurements management UnlicensedLicensed PHY Scheduling SPEED-5G MAC framework Lightly-Licensed d/cRRM Higher layers protocol stack Inter-RAT coexistencecoord. Data plane Monitoring plane Control/configuration plane TX/RX Inter-RATscheduling RRC and RRM configurations RRC signalling Bufferstatusreports Scheduling TX/RX Scheduling TX/RX AI #1 AI #2 AI #n SPEED-5G workshop, London, 07/03/2018
  7. 7. SPEED-5G MAC innovations 4 eDSA capable multi-RAT framework ➨ Inter-RAT coordination at the MAC level to aggregate heterogeneous spectrum resources ➨ Seamless traffic (control and user data) steering from one RAT to the other ➨ Management of contextual PHY and MAC measurements for RRM (aka monitoring plane) ➨ Support of legacy systems (Wifi & LTE-A) and integration of any 5G air interface variants 4 2 novel MAC proposals for eDSA capable RATs ➨ DCS-MAC ● TDD access supporting multi-channel operation in heterogeneous spectrum, based on dynamic channel selection ➨ FBMC-MAC ● Beacon-enabled TDD access based on Listen-Before-Talk for unlicensed spectrum operation, assuming FBMC PHY 53SPEED-5G workshop, London, 07/03/2018
  8. 8. MAC designs description DCS MAC FBMC MAC 54SPEED-5G workshop, London, 07/03/2018
  9. 9. DCS-MAC main characteristics 4 Multi-channel operation 4 Time slotted access with TDD 4 Dynamic channel selection 4 Decentralized decision-making 4 Cluster-based architecture 4 Modified RACH design Physical channel = time slot + frequency channel combination Frame length Multi-frame length SPEED-5G workshop, London, 07/03/2018
  10. 10. DCS-MAC basic operation 4 SC periodically scan all supported channels using a predefined scanning/hopping sequence 4 UEs determine which frequency channel (and when) will be scanned and initiate a transmission with their SCs (radio bearer establishment) 4 UEs adopt a similar scanning procedure to enable a SC initiated transmission 4 Quality of available channels is continuously monitored by UEs and SCs to maintain an up-to- date map of channel quality 4 Intra-cell (or inter-cell) handover can be triggered if radio bearers quality is degraded SPEED-5G workshop, London, 07/03/2018
  11. 11. FBMC MAC main features 57 4 Master-slave operation in 5GHz band 4 Beacon enabled TDD MAC frame 4 LBT-based superframe emission by SCs 4 Mix of scheduled and contention access for UEs 4 OFDMA-like access in DL and UL (FBMC features) SPEED-5G workshop, London, 07/03/2018
  12. 12. FBMC MAC basic operation 58 4 Frame based access: rigid, unfair in dense layouts but maximises throughput in non crowded situations 4 Load based access: fairer access due to backoff process 4 Single channel operation with LBT with variable detection threshold 4 User traffic sent in CFP where SC allocates resources (DL and UL) 4 Beacon carries most of DL control traffic: frame format, UE grants, commands like channel switch 4 DL dedicated command frames (measurement requests) can be multiplexed with data 4 UL control (command) frames sent in CAP w/ multi-channel CSMA SPEED-5G workshop, London, 07/03/2018
  13. 13. MAC simulation results 59SPEED-5G workshop, London, 07/03/2018
  14. 14. Methodology 4 Simulations have been run on calibrated system-level simulation tools to get comparable results 4 Common setup and simulations scenarios have been defined to enable comparison of both designs 4 Simulations results compared with legacy (Wifi and LTE) technologies to show the gains of SPEED-5G 4 MAC designs compared to extract guidelines for MAC selection, w.r.t. the context of operation 60SPEED-5G workshop, London, 07/03/2018
  15. 15. Simulation parameters 4 Topology: ➨ Outdoor hexagonal grid with ISD= 30 to 100m ➨ 10 UEs per cell 4 Channel model ➨ Extended UMi model w/ and w/o fast fading ➨ Spatially correlated shadowing and LOS/NLOS conditions 4 Traffic pattern ➨ 100% downlink – 80% DL / 20% UL ➨ Full buffer and FTP 4 Interference modelling ➨ Explicit co-channel interference modelling (frequency reuse = 1), ➨ Mask-based out-of-band interference (frequency reuse >1 for FBMC) 4 Considered scenarios ➨ Non-coexistence and coexistence with WiFi systems 61SPEED-5G workshop, London, 07/03/2018
  16. 16. Non coexistence scenario 4 UE randomly deployed on the SC coverage and attachment done on strongest SC 4 50 runs per simulation 4 1 simulation = 100s 4 All SCs, all UEs and all packets are modelled, contributing to per device SINR computation 62SPEED-5G workshop, London, 07/03/2018
  17. 17. DCS-FBMC comparison Non-coexistence scenario (results summary) 4 FBMC-MAC is outperformed by DCS-MAC in terms of DL throughput due to LBT (reduction of transmit time) 4 FBMC-MAC outperforms DCS-MAC in UL throughput due to SC-SC interference 4 Irreducible delay due to the frame structure leads to higher latency in DCS in low load scenarios 63SPEED-5G workshop, London, 07/03/2018 MAC design DCS-MAC FBMC-MAC ISD [m] 30 50 100 30 50 100 DL traffic Mean delay [ms] 27 20 13.5 12 6.5 4.5 Per-cell SE [bps/Hz] 0.3 0.4 0.75 0.15 0.25 0.5 Area SE [bps/km2/Hz] 370 191 85 206 108 52.5 Access fairness 0.997 0.997 0.998 0.84 0.88 0.92 UL traffic Mean delay [ms] 113 68 40 29 17 14 Per-cell SE [bps/Hz] 0.02 0.04 0.08 0.05 0.06 0.13 Area SE [bps/km2/Hz] 27 16 10 64 27 15 Access fairness 0.984 0.990 0.989 0.84 0.88 0.92
  18. 18. Coexistence with WiFi systems 4 Assumptions ➨ “Wifi” APs dropped in the SPEED-5G layout (1 AP per SC) ➨ APs implement simplified DCF protocol and assume saturated mode in DL (worst case scenario) ➨ No “Wifi” stations deployed 4 Metrics ➨ Statistics of “WiFi” channel occupancy time ➨ Fairness between SPEED-5G SC and Wifi on channel occupancy 64SPEED-5G workshop, London, 07/03/2018
  19. 19. DCS-FBMC comparison Coexistence scenario (results summary) 4 FBMC-MAC provides a fairer access than DCS-MAC (LBT enables better coexistence characteristics) 4 DCS-MAC is more aggressive on channel access compared to FBMC-MAC but appropriate parameters tuning can provide better fairness 4 Advanced coexistence mechanisms can be incorporated in DCS-MAC to enable better coexistence capabilities 65 Wifi channel occupancy ratio SPEED-5G workshop, London, 07/03/2018 MAC designs DCS-MAC FBMC-MAC ISD [m] 30 100 30 100 Mean delay [ms] 59 26 30 13 Area SE [bps/km2/Hz] 192 58 106 29
  20. 20. SPEED-5G vs. legacy systems 4 DCS-MAC and FBMC-MAC have been compared with legacy technologies on identical scenarios ➨ IEEE 802.11ac for unlicensed spectrum (5GHz) ➨ LTE-A rel. 10 in SISO and w/o aggregation 4 By nature, ➨ FBMC-MAC is close to WiFi as it operates in unlicensed spectrum using LBT ➨ DCS-MAC is closer to LTE-A than WiFi as it targets licensed and lightly licensed spectrum 66SPEED-5G workshop, London, 07/03/2018
  21. 21. SPEED-5G MAC designs against SOTA 4 Both designs outperform WiFi (higher ASE, no user outage) 4 DCS-MAC provides better performance than LTE-A (higher ASE and better cell-edge performance) 67 ASE (bps/km²/Hz) ISD [m] 30 50 100 WiFi (802.11ac) 111 44 20 LTE-A (Rel.10) 442 190 95 FBMC-MAC 241 125 61 DCS-MAC 554 261 116 Full-buffer DL 100%, ISD=100m Full-buffer DL 100%, ISD=30m SPEED-5G workshop, London, 07/03/2018
  22. 22. Conclusion 4 MAC design in SPEED-5G has been specified ➨ A multi-RAT MAC framework in support of eDSA ➨ Detailed specifications (incl. interfaces and primitives) for the 2 MAC designs have been provided 4 Comparison with legacy technologies show that SPEED-5G designs are promising solutions for dense- ultra dense deployment ➨ DCS-MAC give better results in licensed/lightly licensed bands. ➨ Due to LBT, FBMC-MAC is more suitable for operation in unlicensed bands where fair coexistence is mandated. 68SPEED-5G workshop, London, 07/03/2018
  23. 23. MAC innovations in demonstrations 4 Demonstration 1 ➨ MAC framework (w/o aggregation) ➨ HMAC interface with hierarchical RRM entities ➨ FBMC-MAC design implementation 4 Demonstration 2 ➨ Full MAC framework with aggregation point @ MAC ➨ Inter-RAT scheduling applied to LTE and WiFi 69SPEED-5G workshop, London, 07/03/2018
  24. 24. Thank you for your attention! 70 Acknowledgment: The research conducted by Speed-5G receives funding from the European Commission H2020 programme under Grant Agreement N : 671705. The European Commission has no responsibility for the content of this presentation. Find us at SPEED-5G workshop, London, 07/03/2018