LTE ADVANCED – A REAL OPPORTUNITY TO CHANGE THE WORLDprovided we mercilessly exploit it!

Linda Doyle

THE WORLD AS WE KNOW IT.

so what is there to change.....

4

+ unlicensed

‘narrowly defined’

‘afraid’

‘conservative’

‘limited market drivers’

‘slow’

HOW CAN LTE ADVANCED IMPACT ON ANY OF THIS?

so the question for the talk is .....

WHAT IS LTE?

begin at the beginning.....

1G, 2G, 3G, LTE

4G

Long Term Evolution (LTE)

Targeted at high speed mobile broadband

LTE is an OFDMA based technology

Uses SC-FDMA in the uplink to reduce PAPR

LTE supports scalable carrier bandwidths, from 1.4 MHz to 20 MHz

Uses MIMO techniques

LTE supports both frequency division duplexing (FDD) and time division duplexing (TDD)

Simplified network structure – All IP

Support for MBSFN (Multicast Broadcast Single Frequency Network)

http://www.fcc.gov/pshs/techtopics/techtopics22.html

TeliaSonera LTE network

WHAT IS LTE ADVANCED?

moving along.....

1G, 2G, 3G, LTE, LTE+, LTE++++++

4G

Wider-band transmission

Advanced Multi-antenna solutions

Coordinated multi-point transmission

Extended Coverage through Relays and Repeaters

Backwards compatible with LTE

Some LTE Advanced features

what they want .....

100 MHz of spectrum, functioning highly advanced multiple antenna solutions, dense small cell coverage and extended reach through relay services

© Linda Doyle CTVR, Trinity College

a) Continuous b) Non-continuous

carrier aggregation

contiguous non-contiguous

intra-band inter-band

carrier aggregation

contiguous non-contiguous

intra-band inter-band

antenna issues, RF frontend issues, dynamic resource allocation issues, optimisation issues, signalling issues etc......

LOTS OF STUFF

what we know from cognitive radio.....

cancelling at the edges

Azarnasab, Ehsan; Kempter, Roland; Patwari, Neal; Farhang-Boroujeny, Behrouz Filterbank Multicarrier and Multicarrier CDMA for Cognitive Radio Systems. CrownCom 2007.1-3 Aug. 2007 Page(s):472 - 481

filterbank synthesis? sneaking into a standard?

idea is to get rid of thecyclic prefix while at the sametime making it easy to reconstruct – i.e. no need fora complex receiver

Propagation path loss

Maximum Doppler shift at different frequency and mobile speeds

using self-knowledge of hardware capabilitiesradio-profiling

Bansal, G., M. J. Hossain and V. K. Bhargava, “Optimal and suboptimal power allocation schemes for OFDM-based Cognitive Radio systems” , IEEE Trans. Wireless Commun., 7(11): 4710-4718, Nov. 2008.

high order modulation

low order modulation

higher power

lower power

power loading

bringing the cognitive mindset to bear ...

33

+ unlicensedlicensed

carrier aggregations of .....

+ underlayoverlay

carrier aggregations of .....

overlay

overlay

OFDM signal containing three cyclostationary signatures – based on work by Paul Sutton

AND

OR OR OR OR OR

AND

Bidder N AND

Bidder 3

Bidder 2

Bidder 1 AND

MOVES THE POINT OF DIFFERENTIATION .............

AND HOW WE CAN PUSH THE ENVELOPE

the regulatory details.....

service and technology neutrality

dynamic masks?

traditional masks

dynamic masks

http://www.fcc.gov/pshs/techtopics/techtopics22.html

We could do a similar analysis here and look at how the cognitive radio world will help but will leave this analysis to Allen MacKenzie and Luiz DaSilva, who are experts in the field of cognitive networks…..

50

+ unlicensed

‘exploding the definition of cognitive radio’

‘cognitive technology a part of life’

‘it just won’t work with conservative rules’

‘mobile space has lots of market drivers’

‘a greater imperative to move from command and control’

it’s the end of the world as we know it

and I feel fine.

R.E.M. 1998

http://www.youtube.com/watch?v=_eyFiClAzq8&feature=related

Thanks for listening.

ledoyle@tcd.ie