Ultra-Low Latency 100 Gb/s Optical Packet Network
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Learn about how novel technology solves the latency challenge for Ethernet Mobile Fronthaul. This slideshare was used at ECOC 2017 to present the paper "Experimental Demonstration of 100 Gb/s Optical Packet Network for Mobile Fronthaul with Load-independent Ultra-low Latency”.
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Ultra-Low Latency 100 Gb/s Optical Packet Network
- 1. TRANSPACKET Experimental Demonstration of 100 Gb/s Optical Packet Network for Mobile Fronthaul with Load-Independent Ultra-Low Latency Raimena Veisllari*, Steinar Bjornstad*,** and Jan Braute* *TransPacket, Oslo, Norway **Norwegian University of Science and Technology, Trondheim, Norway Presented at ECOC 2017, Sweden
- 2. TRANSPACKET Outline Motivation & Background Experiment Results Conclusion Integrated Packet/Circuit Optical Networks Packet-based Fronthaul Network 17. desember 2017 ECOC 2017, R. Veisllari et al. Paper M.2.A.2Page 2
- 3. TRANSPACKET Fronthaul Networks as of today § High cost § Isolated fronthaul network, e.g. dedicated wavelengths, fibers § Currently based on “proprietary implementations” of TDM-like protocols CPRI and OBSAI § Strict latency requirements § Low layer splits, e.g. CPRI and eCPRI less then 100 microseconds one-way delay, i.e. maximum distance RRU to BBU < 20 km (5µs/km in fiber) § New applications in 5G requiring deterministic and low latency, e.g.: § Autonomous driving § Augmented reality 17. desember 2017 ECOC 2017, R. Veisllari et al. Paper M.2.A.2Page 3
- 4. TRANSPACKET Towards Packet-based Fronthaul § IP/Ethernet – based (eCPRI) § Lowering deployment cost by sharing the network, an integrated approach § Aggregating multiple RRH traffic streams § Fronthaul and backhaul § Converged mobile and fixed access, i.e. fronthaul/backhaul combined with residential and enterprise access 17. desember 2017 ECOC 2017, R. Veisllari et al. Paper M.2.A.2Page 4 Central Office RRH rr Packet (Ethernet) Access Network (Fixed Mobile Converged) Metro/Core Network RRH RRH Residential Access RRH Packet switch Packet switch RRH BBU BBU BBU BBU BBU Packet switch Router Fronthaul Aggregation Enterprise Access
- 5. TRANSPACKET Packet-based Fronthaul Latency Requirements § Packet transport/switching issues: statistical QoS § Packet delay and delay variation depends on load and traffic pattern § Packet Delay Variation (PDV) needs to be smoothed out in playout buffers at the receivers § Have to dimension the network for the peak delay (slowest packet) § Playout buffer configured according to PDV § Need to quantify the peak PDV § PDV depends on number of hops, traffic pattern and load § Low utilization/dedicated fronthaul network § Limiting distance/reach 17. desember 2017 ECOC 2017, R. Veisllari et al. Paper M.2.A.2Page 5
- 6. TRANSPACKET Integrated Packet/Circuit Optical Networks § Guaranteed Service Transport (GST) § Fixed end-to-end delay § Theoretically zero delay variation (ns added by electronics) ECOC 2017, R. Veisllari et al. Paper M.2.A.217. desember 2017Page 6 § Statistically Multiplexed (SM) § Variable delay dependent on the load, traffic pattern, etc. § High throughput: statistical multiplexing Fronthaul traffic carried as GST, i.e. by the “Circuit” Service Less delay-sensitive traffic carried through SM
- 7. TRANSPACKET Experiment Setup § Scenario 1 GST traffic pattern: § Emulating 100G source § Variable Packet Lengths § Vary the offered load § Scenario 2 GST traffic pattern : § Emulating 5 x 10G into a 100G § Burstified 5 x 1518 Byte § 100G load fixed at 0.5 FUSION Ethernet 100G IP Core Xilinx Ultrascale VCU110 board. 100G 100G 6 x 10G ports with SM 1 x 100G port with GST 6 x 10G streams through Anritsu MT1000A Anritsu MD1230 100G GST stream Anritsu MT1100A Traffic generator and analyzers Integrated Packet/Circuit node implementation in Ethernet: FUSION 17. desember 2017 ECOC 2017, R. Veisllari et al. Paper M.2.A.2Page 7
- 8. TRANSPACKET Results 1 § Scenario 1 GST traffic pattern : § Emulating 100G source § Variable Packet Lengths § Vary the offered load § GST PDV < 0.2 µs with 100ns instrument resolution § GST Delay < 2.7 µs § SM PDV varies with the load § Min PDV 1.6 µs without GST at 0.6 load (Min Delay =2.3 µs) § PDV 21.9 µs at load 0.84 without losses § PDV 33.7µs at saturation with SM losses § Throughput 84Gbps with ~ 25Gbps GST and 59Gbps SM 17. desember 2017 ECOC 2017, R. Veisllari et al. Paper M.2.A.2Page 8
- 9. TRANSPACKET Results 2 § Scenario 2 GST traffic pattern: § Emulating 5 x 10G into a 100G § Burstified 5 x 1518 Byte § 100G load fixed to 0.5 § GST PDV < 0.2 µs with 100ns instrument resolution § GST Delay < 2.6 µs § SM PDV varies with the load § PDV from 3.2 µs to 42.3 µs at load 0.93 without losses § Maximum throughput 94Gbps 17. desember 2017 ECOC 2017, R. Veisllari et al. Paper M.2.A.2Page 9
- 10. TRANSPACKET Conclusion § The first demonstration of a 100Gb/s Ethernet-bridged IHON path § Enables Ethernet Fronthaul in a multiservice network consuming only a small fraction of the 100µs one-way delay budget § Zero packet loss § Max Delay < 2.7µs § Peak PDV < 0.2µs § FUSION/IHON is a candidate technology for packet-based fronthaul and integrated multiservice mobile transport network § Front- Mid- and Backhaul integration. 17. desember 2017 ECOC 2017, R. Veisllari et al. Paper M.2.A.2Page 10