5G — Separating Hype from Promise HENNING SCHULZRINNE The views and opinions expressed in this presentation are those of the author and do not necessarily reflect the official policy or position of any agency of the U.S. government. Any resemblanceto actual policies, living or dead, or actual events is purely coincidental. IMS 5G SUMMIT 1
IoT IoT 5G IMS 5G SUMMIT 2
Design for 20 years IMS 5G SUMMIT 3
Generations are distinct IMS 5G SUMMIT 4
IoT requirements ( ( ! Wide-area Wireless Communication Challenges for the Internet of Things IMS 5G SUMMIT 5 Harpreet S. Dhillon, Howard Huang, Harish Viswanathan
5G low latency X X X one-to- many! X V2I2V LAN EEW (< 5 s) tight control loop near-100% availability IMS 5G SUMMIT 6
Niche networks persist short range low energy; mesh ubiquity; low cost tries to usurp niche speed; public APs IMS 5G SUMMIT 7
What’s the economic case for 5G? avg. about 2.1 GB/month T-Mobile: 10 GB tethering IMS 5G SUMMIT 8
Cord-cutting for broadband? IMS 5G SUMMIT 9
Network economics, (over)simplified % OF REVENUE Equipment Construction Operations 70% Equipment 4% Construction 11% 30% Operations 85% IMS 5G SUMMIT 10
How can 5G be cheaper by GB? Backhaul is major cost factor ◦ “Backhaul costs represent almost 6% … of a wireless carrier total operating expenses (OPEX) and 30% of total network costs .” Re-use existing fiber to residential users ◦ Requires cooperation of cable/FTTH provider Reduce license cost for spectrum unlicensed, mmWave ◦ first step: LTE-U IMS 5G SUMMIT 11
Network architecture IMS 5G SUMMIT 12
Networks 1G through 4Gish national carrier one subscriber, one phone, one provider IMS 5G SUMMIT 13
Complexity kills IMS IMS 5G SUMMIT 14
IMS = It Mostly Speaks IMS /VoLTE VoLTE = Voice-Only Later than Expected IMS 5G SUMMIT 15
5G – what exactly is a carrier? Spectrum 40k towers each (US) Spectrum DB DB Level3 Cogent LTE-U 802.11n LTE IMS 5G SUMMIT 16
LTE – one carrier, plus roaming IMS 5G SUMMIT 17
5G: Carriers as consumer brand Inside Outside IMS 5G SUMMIT 18
What are carriers good at? Research? Software development? ◦ Who is going to develop those 5G SDN applications? OTT applications? API-based services? ◦ Why did Twilio and Tropo offer voice service APIs and not the ILECs? IMS 5G SUMMIT 19
The law of new networks “Any new network technology will be justified on (finally) providing QoS ” To succeed, they have to provide good-enough QoS for best effort ◦ at least with competition The business model for QoS is difficult ◦ see bypass toll roads QoS is usually not accessible to applications ◦ or not end-to-end IMS 5G SUMMIT 20
5G prototype: Eduroam IMS 5G SUMMIT 21
5G opportunities beyond hype Applications surprise Low cost per GB carried (capex & opex) may beat QoS ◦ fixed wireless and predictable motion (trains!) may be initial opportunity Complexity kills ◦ layering (1984) and information hiding is still a good engineering principle 5G: 4G++ or opportunity for re-thinking design assumptions ◦ complexity vs. modularity IMS 5G SUMMIT 22
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