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Cambridge Wireless Small Cell SIG presentation from CCS
- 1. Connecting the urban metropolis with self-organising MP2MP wireless backhaul Eric Wilson, Head of Business Development Cambridge Wireless Small Cell SIG 24 September 2015
- 2. 2 Metnet solution overview • Fully self-organising • Multipoint-to-multipoint • No frequency planning • No antenna alignment • Simple installation • Small form factor • High capacity, low latency • Very low CAPEX and OPEX
- 3. 3 The world’s first self-organising small cell microwave backhaul • Up to 16 links per node • Hybrid deployment – Mesh – Point-to-multipoint – Point-to-point • Fully self-organising – Self-healing – Interference aware
- 4. 4 Self-organising small cell backhaul 2 fibre sites, 22 Metnet nodes 99 possible links 20 ac8ve traffic links with S-‐TDMA
- 5. China South Africa UKUSA Growing deployment experience
- 6. • Frequencies: 26 and 28GHz • Latency: Min 40µs, average 150µs • Capacity (112MHz channel) – Single node: 480 Mbps – Dual node: 960 Mbps – Single node >1 Gbps (GA 2016) • Synchronisation – GPS-derived, SyncE, 1588v2 (TC, BC) – Can pass sync timing to local device Node features and performance
- 7. 7 Urban outdoor small cell backhaul Macro cell Metnet HG node Fibre PoP Metnet node Small cell
- 8. 8 Smart cities Macro cell Metnet HG node Fibre PoP Metnet node Small cell Traffic sensor Surveillance camera Public WiFi access point
- 9. 9 Internet Enterprise/indoor small cell backhaul Indoor small cells WiFi access point Metnet node on rooftop Ethernet switch Wireless devices Wired devices
- 10. 10 AND NOW……urban outdoor C-RAN fronthaul! Macro cell Metnet HG node Fibre PoP Metnet node C-RAN RRH C-RAN baseband pool
- 11. 11 Evolution to HetNets • Multi-layered mix of radio access technologies • Different frequency bands • Licensed/unlicensed spectrum • Complex challenge of managing integration • May be best supported through split RAN architecture with centralised and distributed elements
- 12. 12 PHYMAC RF RRH PNF Services VNF S1/X2 SON OAM APPS RRC PDCP RLC Upper MAC Lower MAC Upper PHY Lower PHY PNF PNF PNF PNF PNF Conventional distributed eNB PDCP/RLC based VNF RLC/MAC based decomposition Split MAC based decomposition MAC/PHY based decomposition Split PHY based decomposition Baseline macro: CPRI decomposition Source: Small Cell Forum Possible LTE base station decompositions Metnet supports Small Cell Forum’s MAC/PHY split Metnet meets requirements
- 13. 13 Fronthaul transport options Use case One-way latency DL bandwidth UL bandwidth PDCP-RLC Non-ideal – 30ms 151Mbps 48Mbps RLC-MAC Sub-ideal – 6ms 151Mbps 48Mbps Split MAC Sub ideal – 6ms 151Mbps 49Mbps MAC-PHY Ideal – 250µs; Near ideal – 2ms 152Mbps 49Mbps PHY Split I Ideal – 250µs; Near ideal – 2ms 173Mbps 452Mbps PHY Split II Ideal – 250µs; Near ideal – 2ms 933Mbps 903Mbps PHY Split III Ideal – 250µs; Near ideal – 2ms 1075Mbps 922Mbps PHY Split IIIb Ideal – 250µs; Near ideal – 2ms 1966Mbps 1966Mbps PHY Split IV Ideal – 250µs 2457.6Mbps 2457.6Mbps Source: Small Cell Forum Metnet meets requirements
- 14. 14 Metnet fronthaul trial • C-RAN vendor tested Metnet as fronthaul to provide LTE service • 4 Metnet nodes tested with 2 RRHs • Rooftop and street-level installations • Approx 50 metres apart in LOS conditions • Topologies tested: PTP, PTMP, relay RRH locations Alterna8ve LOS routes
- 15. 15 Metnet fronthaul trial results • No impact to performance for capacity, packet delay, latency and jitter • Meets C-RAN vendor’s KPIs for fronthaul transmission • Further testing planned Vendor’s fronthaul requirements CCS Metnet Latency 10’s of milliseconds Passed Bandwidth 110Mbps Exceeded BER <10-6 Passed
- 16. 16 Does C-RAN mean the end for small cells? • Defer architecture question to RAN experts • From transmission perspective: – Similar challenges for fronthaul as backhaul – How to connect remote equipment to the core? – Transmission must be high capacity, low cost, resilient, plug & play, adaptable, easy to scale… – Flexible, self-organising and self-healing is most effective • Pragmatic C-RAN architecture split (per SCF recommendation) makes microwave-based links feasible • Recommend adoption of SCF proposal for more flexible options to connect RRH to core network
- 17. The world’s first self-organising small cell microwave backhaul www.ccsl.com