cambridge wireless small cell sig presentation from ccs
TRANSCRIPT
Connecting the urban metropolis with self-organising MP2MP wireless backhaul
Eric Wilson, Head of Business Development Cambridge Wireless Small Cell SIG 24 September 2015
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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
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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
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Self-organising small cell backhaul
2 fibre sites, 22 Metnet nodes 99 possible links 20 ac8ve traffic links with S-‐TDMA
China South Africa UK USA
Growing deployment experience
• 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
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Urban outdoor small cell backhaul Macro cell Metnet HG node
Fibre PoP Metnet node
Small cell
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Smart cities Macro cell Metnet HG node
Fibre PoP Metnet node
Small cell
Traffic sensor
Surveillance camera
Public WiFi access point
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Internet
Enterprise/indoor small cell backhaul
Indoor small cells
WiFi access point
Metnet node on rooftop
Ethernet switch
Wireless devices
Wired devices
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AND NOW……urban outdoor C-RAN fronthaul! Macro cell Metnet HG node
Fibre PoP Metnet node
C-RAN RRH
C-RAN baseband pool
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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
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PHY MAC
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
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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
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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
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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
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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
The world’s first self-organising small cell microwave backhaul
www.ccsl.com