1 PAUL KENNARD, CTO | AVIAT NETWORKS IEEE COMSOC PANEL LTE BACKHAUL CHALLENGES, SMALL CELLS AND THE CRITICAL ROLE OF MICROWAVE
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PAUL KENNARD, CTO | AVIAT NETWORKS
IEEE COMSOC PANEL LTE BACKHAUL CHALLENGES, SMALL CELLS AND THE CRITICAL ROLE OF MICROWAVE
AVIAT NETWORKS | 3
LTE (Long Term Evolution)
4G 10x faster than 3G QoS, Low latency All-IP
Low Cost
?
LESSONS LEARNED #1 CONSTRUCTION (not capacity) is key LTE challenge
AVIAT NETWORKS | 20 AUGUST 2010 6
Theore&cal Single User Data Rate Down/Up [Mbps]
Close Medium Far
10MHz 43 / 14.4 28 / 9.5 14 / 4.8
real scenario is 100-150mbps backhaul per 3 sector cellsite
LTE CAPACITY REQUIREMENTS
AND PROPER PLANNING EASES RING CAPACITY DEMANDS
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100Mbps Ring Capacity 300Mbps
typical overbooking factor for mobile operator = ~3x ring capacity ~100mbps in this case
50Mbps
50Mbps 50Mbps
50Mbps 50Mbps
50Mbps
Gateway Node
Maximum Cell-site Capacity Zone of Capacity Growth
100 Mbit/s
400 Mbit/s
1 Gbit/s
Capacity
Time
Cell-Site Capacity
LTE cannot outstrip microwave capacity to cellsite
BECAUSE MICROWAVE HAS EVOLVED…
Strategy Technique
1. More Spectrum (More Hz)
• Multiple channels with link aggregation (incl CCDP)
• ACM
2. More Spectral Efficiency (More Bits per Hz)
• Higher modulations (512/1024 QAM, ACM) • FEC redundancy
3. More “Effective” Throughput (More Data per Bit)
• Header optimization / suppression • Payload compression • Asymmetrical RF
Strategy Technique
1. More Spectrum (More Hz)
• Multiple channels with link aggregation (incl CCDP) – leverage N+0
• ACM
2. More Spectral Efficiency (More Bits per Hz)
• Higher modulations (512/1024 QAM, ACM) • FEC redundancy
3. More “Effective” Throughput (More Data per Bit)
• Header optimization / suppression • Payload compression • Asymmetrical RF
and is a high capacity transport solution
LESSONS LEARNED #2 MICROWAVE MEETS LTE CAPACITY NEEDS even for large rings and multi-cellsite links
11 AVIAT NETWORKS | FEBRUARY 2012
FUTURE OF LTE BACKHAUL IS:
Small Cells!!!
HOWEVER, SMALL CELLS WILL CHANGE THE BACKHAUL PARADIGM…
12 AVIAT NETWORKS |
1. More sites
higher cost, more complexity
2. Different sites new technologies
and construction challenges will get far worse
meaning… none of today’s backhaul solutions will suffice
Wired (fiber/cable/dsl)
Wireless (LOS)
Wireless (NLOS)
Capacity 10Gbps 1-‐2Gbps 200+Mbps (shared, may be ok for HSPA)
Site LocaLon / RestricLons
Not available, costly install
LOS Parabolic Flexible. NLOS
Backhaul Distance Long distance but costly Depends on frequency. Millimeter wave limited
Limited for pt-‐mpt. Pt-‐pt ok
Latency us us 5-‐10ms (ok for HSPA)
CAPEX Very high High (today) Low
OPEX Low Medium Medium
Spectrum N/A Available Costly. Unlicensed opLons very risky
LESSONS LEARNED 3 SMALL CELL NOT SIGNIFICANT MARKET until backhaul gets cheaper and easier
15 AVIAT NETWORKS | FEBRUARY 2012
all in one tiny box... including antenna!
WHICH MEANS FUNDAMENTAL INNOVATIONS WILL BE REQUIRED IN FOUNDATIONAL MICROWAVE TECHNOLOGY…
DISTRIBUTED INTELLIGENCE
OTHER NEW APPROACHES WILL NEED TO BE CONSIDERED
CACHING
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and Microwave Networking solutions will emerge
AVIAT NETWORKS | 17
Integrated, IP Microwave Pla[orm
QoS, Bandwidth management
RouLng
SynchronizaLon
Security Redundancy and
ProtecLon
ACM, RF opLmizaLons
Others (DPI, caching, CDN,
etc)
Microwave Dumb Pipe
AMC Pacer – voted worst car of all Lme!
TO ACHIEVE ALL THIS, WE NEED TO PAY ATTENTION TO WHAT’S IMPORTANT…
THANK YOU
19 20 AUGUST 2010 AVIAT NETWORKS |
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