5G radio access for networked society Janne Peisa, Principal Researcher IEEE 5G Summit, Lisbon
Outline 5G use cases Massive and critical communications 5G radio access Techniques for critical communication Low latency Reliability Public Telefonaktiebolaget Ericsson AB LM 2015 Ericsson 2015-08-18 January 2017 Page 2
5G Use Cases P??? Broadband experience everywhere anytime Mass market personalized media and gaming Meters and sensors, Massive MTC Remote controlled machines Smart Transport Infrastructure and vehicles Human machine interaction And much more Multiple use-cases supported by a common network platform Public Telefonaktiebolaget Ericsson AB LM 2015 Ericsson 2015-08-18 January 2017 Page 3
Wide Range of Requirements Massive MTC Critical MTC SMART BUILDING LOGISTICS, TRACKING AND FLEET MANAGEMENT REMOTE HEALTH CARE TRAFFIC SAFETY & CONTROL SMART METER SMART AGRICULTURE CAPILLARY NETWORKS INDUSTRIAL APPLICATION & CONTROL REMOTE MANUFACTURING, TRAINING, SURGERY LOW COST, LOW ENERGY SMALL DATA VOLUMES MASSIVE NUMBERS ULTRA RELIABLE VERY LOW LATENCY VERY HIGH AVAILABILITY Public Telefonaktiebolaget Ericsson AB LM 2015 Ericsson 2015-08-18 January 2017 Page 4
5G Radio Access Evolution of existing technology + New radio-access technology Evolution of LTE Tight interworking NR ( New Radio ) Targeting spectrum below 6 GHz Targeting entire 5G spectrum range Public Telefonaktiebolaget Ericsson AB LM 2015 Ericsson 2015-08-18 January 2017 Page 5
NR selected design targets Low latency Mini-slot Ultra-lean Multi-service Network Slices One slot Forward compatibility Beam centric Minimize network transmissions not directly related to user-data delivery Multiconnectivity Public Telefonaktiebolaget Ericsson AB LM 2015 Ericsson 2015-08-18 January 2017 Page 6
NR Low latency Short scheduling units Short regular slots 125 s at 60 khz Mini slots Arbitrary starting point and length within a slot Fast retransmissions Two interlaces Retransmission within 250 µs (60 khz numerology) Enabled by front-loaded DMRS/DCI and frequency-first interleaving allowing for rapid data demodulation/decoding Uplink grant-free transmission Fast access to channel Preferably avoiding explicit time alignment (asynchronous access) Public Ericsson AB 2015 2015-08-18 Page 7
Mini-slot transmission Unlicensed operation Unlicensed transmissions should follow LBT rule Do not start transmission until channel is available Occupy channel as soon as it is available Slot-based scheduling: Dummy transmission until start of slot Mini-slot transmission: Rapid occupation of channel with useful data transmission Channel available Slot-based scheduling Dummy TX Channel available Mini-slot transmission Public Ericsson AB 2015 2015-08-18 Page 8
CDF Redundancy through diversity Rayleigh fading channel Diversity may be obtained through spatial diversity, and frequency diversity Time diversity difficult due to latency constraint Coding needed to fully exploit frequency and transmit diversity 10 0 10-2 10-4 10-6 10-8 Div Order = 1 Div Order = 2 Div Order = 4 Div Order = 8 Div Order = 16 90 db 18 db 10-10 -100-80 -60-40 -20 0 Fading Gain (db) Diversity is key for ultra-reliable communications Public Ericsson AB 2015 2015-08-18 Page 9
Multi-connectivity Joint connectivity to multiple sites or multiple systems Intra-layer connectivity Joint transmission/reception: Enhanced coverage Distributed MIMO: Higher peak data rates Inter-layer connectivity Enhanced connectivity robustness Intra-RAT or inter-rat (LTE+NR) Intra-layer Inter-layer Public Ericsson AB 2015 2015-08-18 Page 10
LTE/NR coexistence Frequency multiplexing NR overlaid on LTE scell NR overlaid on LTE pcell NR in LTE MBSFN subframes NR unused LTE UL subframes Public Ericsson AB 2015 2015-08-18 Page 11
Summary 5G designed for new use cases from the beginning 5G = LTE evolution + NR Key technologies for critical communication include Mini-slots for lower latency Multi-connectivity for increased reliability Public Ericsson AB 2015 2015-08-18 Page 12
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