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VoLTE vs 1x Advanced


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#1 Boosted20V

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Posted 05 October 2012 - 03:12 PM

So it's my understanding that Sprint is sticking with 1x Advanced for calling due to the fact that it's more efficient than LTE. This will have some interesting implications with pretty much every other carrier moving to VoLTE. Are any other carriers using 1x Advanced? How will this impact their roaming agreement with Verizon? I suppose Verizon will have their 1x running for quite a while yet even once they start using VoLTE.

EDIT - Also, we can assume at some point Sprint will start using VoLTE, no?

#2 Rawvega

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Posted 05 October 2012 - 03:56 PM

Yes that's a safe assumption.

However, for now there's nothing wrong with sticking with 1x advanced for voice.

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#3 jefbal99

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Posted 05 October 2012 - 05:18 PM

VoLTE is still an unknown and mostly unproven technology. MetroPCS started rolling it out for certain phones in LTE markets, but the major players will wait for the technology to mature
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#4 leozno1

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Posted 05 October 2012 - 06:42 PM

So it's my understanding that Sprint is sticking with 1x Advanced for calling due to the fact that it's more efficient than LTE. This will have some interesting implications with pretty much every other carrier moving to VoLTE. Are any other carriers using 1x Advanced? How will this impact their roaming agreement with Verizon? I suppose Verizon will have their 1x running for quite a while yet even once they start using VoLTE.

EDIT - Also, we can assume at some point Sprint will start using VoLTE, no?


I don't think i've heard of any other US Carriers using 1x Advanced right now. But if networks have been so well off until now using solely CDMA 1x, then moving over the the Advanced should make their network that much more capable. But if there is one thing that I'm a bit skeptical about with VoLTE would be the potential for drastically reduced talk times due to LTE being much more power hungry than CDMA 1x Advanced.

Does anyone know how VoLTE would impact battery life?

#5 ericdabbs

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Posted 05 October 2012 - 07:38 PM

I don't think i've heard of any other US Carriers using 1x Advanced right now.


Actually Cricket announced intention of 1x Advanced deployment in 2012.

http://www.fiercewireless.com/story/leap-deploys-cdma-1x-advanced-more-efficient-voice-calling/2012-01-10

#6 ericdabbs

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Posted 05 October 2012 - 07:43 PM

So it's my understanding that Sprint is sticking with 1x Advanced for calling due to the fact that it's more efficient than LTE. This will have some interesting implications with pretty much every other carrier moving to VoLTE. Are any other carriers using 1x Advanced? How will this impact their roaming agreement with Verizon? I suppose Verizon will have their 1x running for quite a while yet even once they start using VoLTE.

EDIT - Also, we can assume at some point Sprint will start using VoLTE, no?


So apparently VoLTE still has a long way to go. MetroPCS announced in March this year that it would be the first carrier to transition over to VoLTE in 2H 2012. However recent reports in September show that VoLTE is just not there yet and MetroPCS has delayed VoLTE deployment until next Spring. This tells me that there are still complications with VoLTE. I hope Sprint doesn't jump the gun on any VoLTE deployment. I hope Sprint waits until 2014 at least once Network Vision is done to start considering VoLTE. Let AT&T, Verizon, TMobile be the guinea pigs and iron the VoLTE bugs.

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#7 koiulpoi

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Posted 05 October 2012 - 08:59 PM

I keep hearing reports about a "verizon flip-phone that's LTE only", but I have a feeling that's rather unfounded.
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#8 digiblur

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Posted 05 October 2012 - 09:23 PM

Sprint doesn't have the tower spacing to do volte yet.

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#9 S4GRU

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Posted 05 October 2012 - 10:04 PM

Sprint doesn't have the tower spacing to do volte yet.

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Exactly. This is a commonly misunderstood point. VoLTE tower spacing is significantly tighter on the same frequency as 1x. VoLTE is only good to approximately -93dBm RSSI, whereas 1x voice can be used to roughly -103dBm. 10dBm is huge and represents a lot of coverage difference.

Sprint would have to run VoLTE on LTE 800 just to get in the ballpark of CDMA 1900 coverage. And then it would be nowhere near as good as 1x is on 800.

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#10 S4GRU

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Posted 05 October 2012 - 10:06 PM

I keep hearing reports about a "verizon flip-phone that's LTE only", but I have a feeling that's rather unfounded.

There was an article in the past six months where Verizon said they were working on VoLTE and even flip phones that were LTE only. I think the timeline for release was 2013.

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#11 Boosted20V

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Posted 05 October 2012 - 10:52 PM

Exactly. This is a commonly misunderstood point. VoLTE tower spacing is significantly tighter on the same frequency as 1x. VoLTE is only good to approximately -93dBm RSSI, whereas 1x voice can be used to roughly -103dBm. 10dBm is huge and represents a lot of coverage difference.

Sprint would have to run VoLTE on LTE 800 just to get in the ballpark of CDMA 1900 coverage. And then it would be nowhere near as good as 1x is on 800.

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So then Verizon would have the same issues with spacing on their 700mhz, no? They don't have great density yet, correct?

#12 leozno1

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Posted 06 October 2012 - 04:50 AM

Exactly. This is a commonly misunderstood point. VoLTE tower spacing is significantly tighter on the same frequency as 1x. VoLTE is only good to approximately -93dBm RSSI, whereas 1x voice can be used to roughly -103dBm. 10dBm is huge and represents a lot of coverage difference.

Sprint would have to run VoLTE on LTE 800 just to get in the ballpark of CDMA 1900 coverage. And then it would be nowhere near as good as 1x is on 800.

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When you put it that way, it seems like VoLTE isn't even worth it if 1x would have much greater coverage. If thats the case Sprint should stick with HD Voice over 1x. But maybe I am wrong. What are the benefits that VoLTE would provide over using HD Voice on 1x?

#13 bollar

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Posted 06 October 2012 - 05:35 AM

When you put it that way, it seems like VoLTE isn't even worth it if 1x would have much greater coverage. If thats the case Sprint should stick with HD Voice over 1x. But maybe I am wrong. What are the benefits that VoLTE would provide over using HD Voice on 1x?

An advantage is that 4G voice & data could be simultaneously on one antenna, which allows for smaller, probably more power efficient phones.

#14 leozno1

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Posted 06 October 2012 - 06:00 AM

An advantage is that 4G voice & data could be simultaneously on one antenna, which allows for smaller, probably more power efficient phones.


That makes sense. Although a couple posts back I stated that one of the things I'm skeptical about with VoLTE would be the potential for reduced talk times due to LTE being much more power hungry than a 1x CDMA radio. Would that still be the case?



#15 bollar

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Posted 06 October 2012 - 06:16 AM

That makes sense. Although a couple posts back I stated that one of the things I'm skeptical about with VoLTE would be the potential for reduced talk times due to LTE being much more power hungry than a 1x CDMA radio. Would that still be the case?

I don't know. Certainly seems plausible.

#16 S4GRU

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Posted 06 October 2012 - 07:20 AM

So then Verizon would have the same issues with spacing on their 700mhz, no? They don't have great density yet, correct?


That's correct. Verizon VoLTE would offer significantly reduced coverage than VZW 1x service in most instances. VZW VoLTE on LTE 750 would have coverage roughly similar to their PCS spacing, but nowhere near as much as their Cellular spacing (which is the lion share of their 1x deployments). And their VoLTE on AWS would offer pretty anemic coverage, but it would most likely always be redundant.

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#17 S4GRU

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Posted 06 October 2012 - 07:35 AM

When you put it that way, it seems like VoLTE isn't even worth it if 1x would have much greater coverage. If thats the case Sprint should stick with HD Voice over 1x. But maybe I am wrong. What are the benefits that VoLTE would provide over using HD Voice on 1x?


Once VoLTE is worked out, Sprint could use it as an overlay. It could become the major carrier of voice traffic, and Sprint could reduce its number of voice carriers. Just leaving one 1x carrier on CDMA 800 for distance and penetration, to cover area where VoLTE stops short.

However, since 1x Advanced is notably more efficient than VoLTE, Sprint should ride that gravy train all the way to the end of the line. They probably should start adding VoLTE capability to devices in the next year or so, so they can shunt additional traffic as needed to VoLTE without deploying more spectrum robbing 1x carriers. But at this point, this is nowhere near a priority.

1x Advanced is a voice workhorse. Whose voice capacity and coverage are just unrivaled at this point. HD voice can be run over 1x the same as VoLTE.

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#18 S4GRU

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Posted 06 October 2012 - 07:38 AM

That makes sense. Although a couple posts back I stated that one of the things I'm skeptical about with VoLTE would be the potential for reduced talk times due to LTE being much more power hungry than a 1x CDMA radio. Would that still be the case?


With 28nm chips, it seems like CDMA and LTE battery life have been the same. I stay in CDMA/LTE mode on my GS3, and do not notice a difference in battery life whether I have a 3G or 4G connection. However, if I have a weak 3G connection, my battery will drain pretty fast.

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#19 koiulpoi

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Posted 06 October 2012 - 07:42 AM

1x Advanced is a voice workhorse. Whose voice capacity and coverage are just unrivaled at this point. HD voice can be run over 1x the same as VoLTE.

So, what exactly is "HD Voice"? What handsets can do it, and when will it roll out? There's surprisingly little information I can pull up about it, other than it's "clearer" or something, but no indication of how it works.
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#20 S4GRU

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Posted 06 October 2012 - 07:54 AM

So, what exactly is "HD Voice"? What handsets can do it, and when will it roll out? There's surprisingly little information I can pull up about it, other than it's "clearer" or something, but no indication of how it works.


The EVO LTE does HD voice. It uses two microphones and I think its own compression codec. But the device on the other end has to also have it for all the advantages to be noticeable. It is clearer than land line communication.

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