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Next Generation RAN Architecture
Sam LuuTELUSAssociate Director, Technology Planning and Strategy Manager
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Agenda
About TELUS
LTE Industry Challenges and in-building wireless data experience
Understanding LTE Performance Characteristic
TELUS Wireless Data Findings
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About TELUS
TELUS announced its commitment to a full national launch of a next generation wireless service by early 2010 based on the latest version of High Speed Packet Access (HSPA) technology.
This initiative ensures a smoother transition to long term evolution (LTE) technology, the emerging worldwide fourth generation (4G) technology standard, as it becomes available.
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Industry Commitment
Other announcements on LTE in North America and Internationally
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Industry challenges with wireless data networks
Data traffic is growing exponentially and clustering around in- buildings
– DoCoMo has experienced 70% of mobile calls occurring in building – “Much of that number can be attributed to mobile applications”
– PTS Sweden saw growth of 203TB to 2191TB of data in 2007 (Informa)– “Vodafone notes that data traffic increased more than tenfold in the 12 months to
end-March, compared with the preceding 12 months” Mike Roberts, Informa– “T-mobile reported a tenfold year-on-year increase in WCDMA/HSPA traffic in
1H07” Mike Roberts, Informa– “In 2008, the home environment will be responsible for 35% of all mobile data
traffic, and by 2013 it is expected to predominate with an overwhelming 60%.” Malik Saadi, Informa
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Industry challenges with wireless data networks
But the ROI is unclear for 4G high speed wireless networks– Data backhaul needs are potentially exponential, and potentially 3x the voice
cost– In-building solutions are equally as expensive than macro sites
Revenues are not growing exponentially with data traffic and the future business model is at risk if nothing changes
Future 4G investments and cost structures are difficult to justify with today’s data revenue models
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How can operators engineer the network better with LTE?
Best effort link performance of OFDM and 3G systems are similar – close to the Shannon limit
Future LTE improvements will focus on interference-reduction through advance receivers and schedulers
In-building?
Pico?
Macro
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LTE and HSPA comparison in a macro environment
25% downlink gain with LTE (1x2) over HSPA R7 (1x2)– ~6 to 7% gain due to Interference Rejection Combining (IRC)– ~18-19% gain due to Frequency/Time Selective Scheduler and higher BW efficiency
2x uplink improvement with LTE (1x2) over HSPA R7 (1x2)– Macro environment: LTE: 0.7 bps/Hz (1x2) vs 0.34 bps/Hz HSUPA R7 (1x2)
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3G and WiFi traffic comparison
WiFi data usage is on par with the larger 3G network with 200 TB traversing the network in 2007
TELUS WiFi hotspots indicates our 3G network in-building usage has room to grow – WiFi hotspots carry 10x the volume 3G hotspot usage
Growth in 3G hotspots is exponential in nature, doubling or quadrupling every year
Hotspot traffic is forecasted to surpass our 3G macro network capacity by 2012
Current Traffic Projected Traffic
Exponential Sectors
0
100,000200,000
300,000400,000
500,000600,000
700,000
Nov-05Mar -0
6Ju l-06Nov-06Mar -0
7Jul-07Nov-07Mar -0
8Jul-08Nov-08Mar -0
9Jul-09Nov-09Mar -1
0Jul-10Nov-10Mar-1
1Ju l-11Nov-11Mar -1
2Jul-12Nov-12
Usag
e (M
B)
Poly. Grow th (deg 4)
Data
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3G traffic concentration – as an example
50% of the total daily traffic is carried by ~10% of the sectors
50% of the total daily voice load is carried by ~25% of the sites
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Connection traffic is another area of concern
Sites Address# Times
Peak per day
ON0421 Toronto - Union Station Overload
ON0175 Toronto - King St W/Bay St High
ON0423 Toronto - Front St W/Spadina Ave High
ON1775Mississauga - Burnhamthorpe/Hurontario High
ON0177 Toronto - College St/University Ave High
ON0422 Toronto - Convention Centre Low
ON0053 Toronto - Hwy 400/Hwy 7 Low
ON1099 Toronto - Bay St / Queen St West Low
ON0030 Toronto - Pearson Airport None
ON1097 Toronto - Yonge St/Queen St None
ON0175 Toronto - King St W/Bay St Low
Connection oriented traffic is beginning to stress the system
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What is mobile data being used for?
What type of data is actually consumed?– Mainly on laptops/data cards by volume– High connection volume originate from smart phones
Why?– Driven by predictable pricing– Wide coverage availability – Connection simplicity
Implications– Mobile data consumption is accelerating as data prices decline– Operators are not attracting usage with content (by data volume)
Mainly peer to peer content
Data Value does not equal Data Volume
Corporate email relatively small by volume
– Operators need to protect high value services from abuse
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Key Messages
Future 4G investments and cost structures are difficult to justify with today’s data revenue models
LTE improves the spectral efficiencies over HSPA, however performance come from significantly improving the RF – vendors offering macro cell alternatives can encourage ‘4G’ investments by operators
Operators can leverage their network knowledge to protect their high value users and cost effectively address network growth (using something other than macro cells)