LTE Backhaul Challenges, Small Cells and the Critical Role of Microwave
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Transcript of 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
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AVIAT NETWORKS | 3
LTE (Long Term Evolution)
4G 10x faster than 3G QoS, Low latency All-IP
Low Cost
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?
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LESSONS LEARNED #1 CONSTRUCTION (not capacity) is key LTE challenge
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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
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AND PROPER PLANNING EASES RING CAPACITY DEMANDS
7 20 AUGUST 2010 AVIAT NETWORKS |
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
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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
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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
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LESSONS LEARNED #2 MICROWAVE MEETS LTE CAPACITY NEEDS even for large rings and multi-cellsite links
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11 AVIAT NETWORKS | FEBRUARY 2012
FUTURE OF LTE BACKHAUL IS:
Small Cells!!!
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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
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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
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LESSONS LEARNED 3 SMALL CELL NOT SIGNIFICANT MARKET until backhaul gets cheaper and easier
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15 AVIAT NETWORKS | FEBRUARY 2012
all in one tiny box... including antenna!
WHICH MEANS FUNDAMENTAL INNOVATIONS WILL BE REQUIRED IN FOUNDATIONAL MICROWAVE TECHNOLOGY…
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DISTRIBUTED INTELLIGENCE
OTHER NEW APPROACHES WILL NEED TO BE CONSIDERED
CACHING
16 20 AUGUST 2010 AVIAT NETWORKS |
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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
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AMC Pacer – voted worst car of all Lme!
TO ACHIEVE ALL THIS, WE NEED TO PAY ATTENTION TO WHAT’S IMPORTANT…
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THANK YOU
19 20 AUGUST 2010 AVIAT NETWORKS |