5G Concept

EAB-14:068423 | Commercial in conf idence | © Ericsson AB 2014 | 2014-11-18 | Page 2
›What is 5G and what should it provide?
›5G spectrum?
›Role of LTE evolution in the 5G context?
›New radio access technologies?
›Transport impact?
Outline

whAt is 5G?
A wide range of requirements
More than just bigger and better mobile broadband
A platform on which any future wireless application
can be implemented
Evolution of existing radio access
+
New radio-access technologies

5G spectrum range
5G spectrum range
1 GHz 3 GHz 10 GHz 30 GHz 100 GHz
› From below 1 GHz up to 100 GHz
– Lower frequencies (< 6 GHz) will be the backbone, providing 5G services with wide-area coverage
– Higher frequencies (>10 GHz) for extreme traffic capacity and data rates in dense scenarios
› 2020: LTE deployed in most available lower-frequency spectrum
 Allow for backwards-compatible introduction of 5G capabilities at lower frequencies

› LTE evolution = backwards-compatible evolution
– Strive to meet 5G requirements
– Possible to retain legacy UEs on the same carrier
 quick introduction of 5G services
– LTE should evolve as far as possible, constrained by backwards
compatibility
› Further enhanced MBB & MTC
› Higher capacity, lower latency, higher reliability, lower energy
consumption, …
5G Radio Access
› New RAT = no backwards-compatibility constraints
– Further optimization without compatibility constraints

spectrum for “New RAT(s)”
1 GHz 3 GHz 10 GHz 30 GHz 100 GHz
› Higher-frequency spectrum (> 10 GHz)
– May be different solutions for different spectrum, e.g. sub-30 GHz vs. “true” mmw
› New spectrum below 6 GHz if available
› Gradual migration into currently used spectrum
Gradual migration
of new technology
into existing spectrum
Evolution
of LTE
New technology

Overall 5G solution
Common “higher layers”
Tight interworking
“L1/L2”
5G structure
Gradual migration
into existing spectrum
Existing spectrum New spectrum
LTE evolution “New RAT”
Backwards
compatible
No compatibility
constraints
Different detailed solutions
depending on frequency

› Dual connectivity between new RAT on higher frequencies
and wide-area-covering LTE on lower frequencies
– Will initially be a common scenario
– To simplify introduction of new RAT
Tight interworking
› D2D using new RAT controlled by overlaid wide-area LTE network
› User-plane aggregation of new RAT and LTE on lower frequencies
– Full bandwidth can be retained at least for new device
– For more easy/smooth migration of new RAT into existing spectrum

5G Technology areas
Extension to higher frequencies
Complementing lower frequencies for extreme
capacity and data rates in dense areas
Multi-antenna technologies
For higher as well as lower frequencies
Beam-forming
for coverage
Multi-user MIMO
for capacity
Multi-site connectivity
Multi-site
transmission/reception
Multi-layer
connectivity
…
Ultra-lean design
Minimize transmissions not related to user data
Separate delivery of user data
and system information
Access/backhaul integration
Same technology for access and backhaul
Same spectrum for access and backhaul
Device-to-device communication
Network controlled D2D
Spectrum flexibility
Unlicensed
Shared licensed
Network sharing
Complementing
dedicated
licensed spectrum
Flexible duplex Spectrum sharing

System Control Plane
› Separate user-plane data transmission from system functionality
– System information and control provided wide-area by overlaid layer
– Underlaid network nodes only active when user-data to convey
› Major part of system information provided on a per-need basis
– Minimize amount of broadcast system information
– Separate of user data from control and system information  multi-layer connectivity
› Multiple RATs may share the same system control plane

› Multi-layer connectivity
– Between overlaid low-frequency and underlaid
high-frequency layers
› Robustness
– Spotty coverage at higher frequency bands
› Multi-site transmission
– Reception of multiple beams
› Diversity and robustness
– Rapid changes in propagation conditions 
connectivity to multiple sites beneficial
Multi-Site Connectivity

Network-controlled
direct communication
Device-based
Relaying
Direct communication
Unicast
Unicast
Broadcast / Groupcast
Network-controlled
direct communication
Device-to-device communication
› Tightly integrated device-to-device communication under network control

Backhaul-Access Convergence
› Dense deployments – challenging backhaul
– Access moving up in frequency to get more spectrum and bandwidth
– Wireless backhaul moving down in frequency to handle nLOS
› Integration of “backhaul” and “access”
– Same spectrum and technology for the two
– Dynamic sharing of resources between the two
– Single management system
› A first step towards multi-hop communication

Transport Data PLANE
Key challenges
Number of transport Capacity
clients
Latency
• Site/cell densification will lead to a
larger number of transport clients
• Up to a factor 100 small cells per
macro in some areas
• Order of magnitude higher traffic
densities
• Several orders of magnitude in
some areas/locations
• Additional order of magnitude
required capacity for specific
segments and deployment models
(e.g. C-RAN)
• Support for low latency services
considered as one important
aspect of 5G (e.g. critical MTC).
• Stringent latency requirements
associated with supporting
particular RAN deployment models
(CPRI fronthaul, CoMP, etc)
Affordable & Sustainable
Flexible

› 5G: “Seamless wireless Internet”
– “10 Gbps” throughput on air interface
› More bandwidth (100G -> 1T) needed on backhaul
› e2e transport + radio solutions
– “1 ms” latency on air interface
› Lower latency on backhaul and fronthaul
› More localised X2 routing over midhaul (including IPsec)
› 5G target architecture
– Ultra dense, 10 m cell range
› Use any available transmission for backhaul, midhaul & fronthaul
› Cloud-based security infrastructure
› ”Intelligent” transport (e.g., SDN, SON)
– New Licensed/unlicenced spectrum
› Available for wireless backhaul
2020: small cells and 5G
- impact on Transport, sync, security?
↑ transport Evolution: latency, BW, connections, options
LTE will become the dominant technology < 6 GHz
with backhaul, midhaul & fronthaul transport
RRU
Backhaul
Basestation
site
Network
controller /
gateway site
SGW, MME
Midhaul
Fronthaul
Pico eNB
Macro eNB
Small cell
site
Remote radio
site
Backhaul

5G Concept

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