from gsm to lte
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Martin Sauter - www.wirelessmoves.com - From GSM to LTE - Medienforum NRW - June 2011 1
Medienforum NRW 2011
From GSM to LTE – An Introduction
Martin Sauter
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Martin Sauter - www.wirelessmoves.com - From GSM to LTE - Medienforum NRW - June 2011 2
Who Am I• (Wireless) Network Researcher and Blogger• Book Author• Project Manager working for a Mobile Network
Operator
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Martin Sauter - www.wirelessmoves.com - From GSM to LTE - Medienforum NRW - June 2011 3
Technology Overview: GSM(First Networks 1992/93)
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Martin Sauter - www.wirelessmoves.com - From GSM to LTE - Medienforum NRW - June 2011 4
GSM Characteristics• Originally designed for telephony• 200 kHz (0.2 MHz) carriers (channels)• 8 timeslots per channel = 8 phone calls• 3 sectors (120°) per base station is typical• Several carriers per sector is typical• Max range: Up to ~30 km• Typical range: 500m in cities for capacity
reasons
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Martin Sauter - www.wirelessmoves.com - From GSM to LTE - Medienforum NRW - June 2011 5
Typical Base Station Antennas
Picture: Martin Sauter
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Martin Sauter - www.wirelessmoves.com - From GSM to LTE - Medienforum NRW - June 2011 6
Technology Overview: UMTS(First Networks 2002/2003)
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Martin Sauter - www.wirelessmoves.com - From GSM to LTE - Medienforum NRW - June 2011 7
UMTS / HSPA Network Architecture
Source: Beyond 3G
, Bringing Netw
orks, Terminals and
The bread and butter service!
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Martin Sauter - www.wirelessmoves.com - From GSM to LTE - Medienforum NRW - June 2011 8
GSM / UMTS / LTE BTS'es Today
Pictures: Martin Sauter
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Martin Sauter - www.wirelessmoves.com - From GSM to LTE - Medienforum NRW - June 2011 9
HSPA today• Frequency Bands (→ http://tinyurl.com/4pdr3o)
• Speeds, Always-On, Keep-Alive Signaling• Activity States (DCH, Cell-FACH, Cell-PCH, URA-PCH, Idle →
http://tinyurl.com/2w5c9zj)
• Latency• Power Consumption, Fast Dormancy• → Impact on Services• → Impact on Network
(Further Reading: http://tinyurl.com/2e6dxkt)
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Martin Sauter - www.wirelessmoves.com - From GSM to LTE - Medienforum NRW - June 2011 10
HSPA+: Higher Speeds And MoreService Benefits• New features beyond higher speeds and their
impact on services, e.g.:• Lower latency• Less power consumption in idle mode• Faster and fewer state switches
Further background: http://en.wikipedia.org/wiki/Hsdpa
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Martin Sauter - www.wirelessmoves.com - From GSM to LTE - Medienforum NRW - June 2011 11
Higher Speeds But Not EverywhereEricsson Review article shows maximum speed depending on location.
http://tinyurl.com/dk6c2p (not included due to copyright reasons but available via this link, see Figure 2)
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Martin Sauter - www.wirelessmoves.com - From GSM to LTE - Medienforum NRW - June 2011 12
The Backhaul Impact on Services• For both HSPA and LTE, the legacy backhaul
architecture based on x * 2 Mbit/s E-1 links is by far not sufficient anymore and far too expensive.
• Alternatives:• Fiber – Very fast but expensive rollout• VDSL – In combination with VDSL + fiber network
deployment for super high speeds for homes.• Microwave Ethernet
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Martin Sauter - www.wirelessmoves.com - From GSM to LTE - Medienforum NRW - June 2011 13
Technology Overview: LTE(First Networks 2010/11)
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Martin Sauter - www.wirelessmoves.com - From GSM to LTE - Medienforum NRW - June 2011 14
LTE Network Overview
Source: M
artin Sauter, From
GS
M to LTE
The bread and butter service is missing!
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Martin Sauter - www.wirelessmoves.com - From GSM to LTE - Medienforum NRW - June 2011 15
OFDMA – What is That?
OFDMA = Orthogonal FrequencyDivision Multiple Access
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Martin Sauter - www.wirelessmoves.com - From GSM to LTE - Medienforum NRW - June 2011 16
Bandwidth: How Much and Where?• 1.25 – 20 MHz: Impacts max. possible speed• 10 MHz in 800 MHz Digital Dividend per Network• 15-20 MHz Channels in 1800 and 2600 MHz• Lots of bands globally, even locally, everything
between 700 and 3600 MHz. Big issue! • → The „hedgehog phone“ - is it realistic?
LTE Bands - For further reading: http://tinyurl.com/3ywx2vs
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Martin Sauter - www.wirelessmoves.com - From GSM to LTE - Medienforum NRW - June 2011 17
LTE = IP Services only• Pros:
• Simplified Network Infrastructure• Less Latency• Less Complexity
• Cons:• Complex integration of voice services with the
ability to hand-over to GSM or UMTS when leaving the coverage area.
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Martin Sauter - www.wirelessmoves.com - From GSM to LTE - Medienforum NRW - June 2011 18
GSM, HSPA and LTE side by side• GSM for voice centric devices, maximum
coverage and international voice roamers.• UMTS (HSPA) for mobile devices with a strong
voice integration (smartphones) and high speed data (3G USB dongles).
• LTE to provide high speed Internet access in rural areas (800 MHz), indoor coverage (cities) and high capacity (cities, 1800 and 2600 MHz). (LTE USB sticks, pads, notebooks, etc.).
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Martin Sauter - www.wirelessmoves.com - From GSM to LTE - Medienforum NRW - June 2011 19
When Will GSM be Switched Off?• NTT DoCoMo to switch-off 2G in 2011 – special
case (http://tinyurl.com/2uprcyx)
• GSM will remain strong well over this decade and beyond. Reasons: 3G still not ubiquitous, equipment refreshes, roaming, new entrants, new markets, handset prices. Thoughts from back in 2007: http://tinyurl.com/34t7pfe)
• Phaseout Architectures (http://tinyurl.com/375v5yd)
• Virtual GSM (http://tinyurl.com/2vx939b)
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Martin Sauter - www.wirelessmoves.com - From GSM to LTE - Medienforum NRW - June 2011 20
Picture by Fabian Schustek
Thank You!