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Testing times for LTE – can it co-exist with 2 and 3G systems?

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sivan_ramachandran
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re: Testing times for LTE – can it co-exist with 2 and 3G systems?
sivan_ramachandran   4/23/2011 3:40:08 AM
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It seems like LTE system, rather than providing support for voice within its standard, lays emphasis on Inter-RAT handover for going back and forth between legacy GSM networks for voice and then coming back to LTE for data. This has potential latency issues. However, VoIP as one of the data services itself is possible within LTE, but the framework around it, to convert the circuit switched voice into VoIP (at the core) needs to be done to enable voice calls without the mobile leaving the LTE connected state. Interesting...

rharding64
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re: Testing times for LTE – can it co-exist with 2 and 3G systems?
rharding64   4/21/2011 1:18:09 AM
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I worked for t-mobile for 2 years where i designed/built test automation to evaluate UMA/GSM operation based on user defined test session scenarios. for battery life/current drain test i evaluated over UMA radio, over GSM radio and sniff specific packet fields. so i can be confident in saying that there is a sizable battery current draw change when you cycle between UMA and GSM. results are dependent upon handsets. i did RAM sepia and blackberry quite often, but also the others like samsung, nokia, motorola, htc as well. post analysis is after running test for days at a time in histogram plot recording about 10 parameters about every 3 seconds or so. it does not sound too awfully hard to set up for video and live tv test in the automation. im on the unemployment right now, so looking for automation test design ops right now.

Cezar Palconet
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re: Testing times for LTE – can it co-exist with 2 and 3G systems?
Cezar Palconet   4/20/2011 10:09:57 AM
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Deployment of LTE could pose additional burdens for the existing mobile GSM service, unless attention is given on the migration and cutover. Considering that LTE is a data centric service, and network resource requirements are large compared to existing GSM, especially when the system falls back, This will be contributory to the overall negative impact on user experience, if resources are denied to voice connection. Provision for testing performance on migration and cutover from the old GSM and its upgrades is a major consideration on the implementation of LTE, not to mention the limited spectrum resource provided in its initial deployment, prior to full adoption using existing GSM frequencies. User experience during this initial stages of implementation and migration is a concern.

NA_SA
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re: Testing times for LTE – can it co-exist with 2 and 3G systems?
NA_SA   4/20/2011 6:11:15 AM
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Hi all! What is the expected battery consumption of the mobile handset on LTE, if applications like, video call and live tv is operational. Can I get a comparision of battery consumption w.r.t GSM handset with only voice applications? in 3G,the consumption of battery is extremely high for video call and live tv.

Kinnar
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re: Testing times for LTE – can it co-exist with 2 and 3G systems?
Kinnar   4/17/2011 6:28:57 PM
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Simultaneous co-existence of all different Access Technologies and Different versions of that will be very much essential as in most of the countries all different service providers have started taking services from Common Infrastructure Service Providers that really leads to a common platform allowing access to all different technologies from one place.

Bert22306
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re: Testing times for LTE – can it co-exist with 2 and 3G systems?
Bert22306   4/16/2011 10:38:55 PM
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I don't think there is an absolute need for LTE to support pure voice comms, although I have to assume that the wireless cellcos want to migrate to a common physical layer, eventually. Perhaps eventually the cellcos want to reassign the spectrum they have dedicated to 2G and 3G to be used in 4G. Actually, though, I don't agree with the hype about LTE being more spectrally efficient than the cdma2000 or GSM WCDMA schemes, which were initially introduced with 3G. The wideband CDMA schemes (both of them) have evolution paths that include most of the same spectral efficiency fundamentals as LTE. They evolve to 64-QAM, they evolve to 20 MHz RF channels, they evolve to MIMO. Just like LTE. And as a matter of fact, cdma2000, much like LTE, can also aggregate RF channel slices as narrow as 1.25 MHz wide, which was the channel size used in the original 2G Qualcomm CDMA. The WCDMA used by GSM cannot, though. It's channels are made up of 5 MHz slices. There may be some ultimate difficulty in continuing to increase the channel capacity with spread spectrum schemes (WCDMA), as opposed to the LTE's OFDM (downlink), but that's just a guess on my part. I have to confess that aesthetically, I find spread spectrum to be a lot more fun than LTE. I wonder if it would not be possible for the cdma2000 schemes to migrate their voice sessions to VoIP, and ease the handovers between cdma2000 and LTE that way? One would think that the base stations could negotiate with the user equipment, to see if the user is capable of VoIP, at the beginning of each session.

prabhakar_deosthali
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re: Testing times for LTE – can it co-exist with 2 and 3G systems?
prabhakar_deosthali   4/16/2011 6:35:57 AM
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Quite an interesting article . Gave me the technological insight into LTE, which , if I have understood correctly, is a go between the 3G and the evolving 4G standard. I could not understand however why there is a need to use LTE for pure voice communications.Can somebody educate me on this?

JanineLove
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re: Testing times for LTE – can it co-exist with 2 and 3G systems?
JanineLove   4/15/2011 11:17:18 PM
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This article really cuts through the hype and takes a nice, practical approach to implementing LTE. Sound off below if you find this article useful or if you have a question for the author.

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