GSM VS CDMA
I hear China is considering CMDA. With their population, that could be the end for GSM.
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I thought I heard they were considering WCDMA. But someone else in this forum said that they are going to do both. This means they would be doing both CDMA and WCDMA. So I guess it's not the end of GSM. But listen to Ruff, They are both good.
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I beleive calls divided up by code is better then time.
It really depends on where U r using the service. There r parts of the US where GSM works a lot better than CDMA and vice versa.
It really depends on where U r using the service. There r parts of the US where GSM works a lot better than CDMA and vice versa.
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In the eveloution through High Speed Data, the 2 paths will eventually meet, and end up in the CDMA realm.
CDMA(IS-95)->1x-RTT(CDMA2000)-> 1xEV-DO(DO=Data Only)-> 1XEV-DV(DV=Data and Voice)-> 3xRtt (Broad Spectrum)
(all of the above can co-exist, and are backwards compatible)
GSM->GPRS->EDGE->UTMS (W-CDMA, Wide Band CDMA)
(none of the above are backwards compatable, and are all completely seperate networks)
So, eventually, you'll get CDMA one way or annother. It is just taking those poor GSM carriers longer to get there.
Funny, huh? Aparantly we all CAN get allong.
CDMA(IS-95)->1x-RTT(CDMA2000)-> 1xEV-DO(DO=Data Only)-> 1XEV-DV(DV=Data and Voice)-> 3xRtt (Broad Spectrum)
(all of the above can co-exist, and are backwards compatible)
GSM->GPRS->EDGE->UTMS (W-CDMA, Wide Band CDMA)
(none of the above are backwards compatable, and are all completely seperate networks)
So, eventually, you'll get CDMA one way or annother. It is just taking those poor GSM carriers longer to get there.
Funny, huh? Aparantly we all CAN get allong.
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WRONG!
WCDMA is very much different than CDMA. WCDMA is based on the core of GSM and is backwards compatable with GSM.
WCDMA is the 3G standard that most GSM carriers are moving to. Parts of the WCDMA standard are based on GSM technology. WCDMA networks are designed to integrate with GSM networks at certain levels. Most WCDMA phones include GSM as well, for backward compatibility.
WCDMA borrows certain technology ideas from CDMA, as the name implies, but is in fact very different and incompatible with phones and networks using "CDMA" technology.
https://www.phonescoop.com/glossary/term.php?gid=104 »
WCDMA and GSM can hand off seamlessly while moving from a WCDMA area to a GSM area and back.
If a UMTS custome ...
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WCDMA is very much different than CDMA. WCDMA is based on the core of GSM and is backwards compatable with GSM.
WCDMA is the 3G standard that most GSM carriers are moving to. Parts of the WCDMA standard are based on GSM technology. WCDMA networks are designed to integrate with GSM networks at certain levels. Most WCDMA phones include GSM as well, for backward compatibility.
WCDMA borrows certain technology ideas from CDMA, as the name implies, but is in fact very different and incompatible with phones and networks using "CDMA" technology.
https://www.phonescoop.com/glossary/term.php?gid=104 »
WCDMA and GSM can hand off seamlessly while moving from a WCDMA area to a GSM area and back.
If a UMTS custome ...
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Missed the point....
As your post implies:Most WCDMA phones include GSM as well, for backward compatibility.
They are not compatible networks. Similar to Trimode CDMA phones, the AMPS and CDMA are 2 completely separate networks, and are completely incompatible. However, some phones contain both chip sets and can facilitate the hand-off.
There are a few CDMA/GSM handsets out there, that doesn't make those networks compatible... And, neither is GSM/UTMS.
In the CDMA Evolution, all forward steps with exception to EVDO while awaiting EVDV are backward compatible. Meaning: A 1xRTT radio can handle traffic from a IS-95 mobile, as can an EV-DV radio accept traffic from a 1xRTT and IS-95 mobile.
Try getting the same equipment in a UT...
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As your post implies:Most WCDMA phones include GSM as well, for backward compatibility.
They are not compatible networks. Similar to Trimode CDMA phones, the AMPS and CDMA are 2 completely separate networks, and are completely incompatible. However, some phones contain both chip sets and can facilitate the hand-off.
There are a few CDMA/GSM handsets out there, that doesn't make those networks compatible... And, neither is GSM/UTMS.
In the CDMA Evolution, all forward steps with exception to EVDO while awaiting EVDV are backward compatible. Meaning: A 1xRTT radio can handle traffic from a IS-95 mobile, as can an EV-DV radio accept traffic from a 1xRTT and IS-95 mobile.
Try getting the same equipment in a UT...
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You can hand off a CDMA call to AMPS but you can't hand off from AMPS to CDMA without dropping the call, therefore they are not fully compatable. You can hand off GSM calls to WCDMA, and you can hand WCDMA off to GSM, therefore they are fully compatable. There are different levels of compatability. You can't compare CDMA-AMPS to WCDMA-GSM because they simply aren't alike.
While the coded air-interface is what makes WCDMA exactly that, the entire rest of the technology is based on GSM. UMTS takes the MAP core (to route calls) and the AMR and EFR speech protocals (which define how the audio is digitized, compressed, and encoded) from the GSM technology (which is basically the entire technology without the time divison air-interface).
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While the coded air-interface is what makes WCDMA exactly that, the entire rest of the technology is based on GSM. UMTS takes the MAP core (to route calls) and the AMR and EFR speech protocals (which define how the audio is digitized, compressed, and encoded) from the GSM technology (which is basically the entire technology without the time divison air-interface).
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I doubt any of this will get through to you, CDMA vs. UTMS-> GSM analogy.
I see them as being very much alike by being completely different. You can't hand off from amps to anything because it is so arcane, and there was simply nothing to hand off to when it was designed... But the analogy stands,... They are two separate incompatible networks (just as UTMS and GSM are).If you build a AMPS/CDMA cell, you need twice the equipment to put in the little VZW shack at the base of it. In the shack next door to that if you want UTMS and GSM on that cell, you also need twice the equipment.
This is unlike the CDMA progression is all i'm saying. If you install EVDV on a site, you do not also need to install 1xRTT,... the same equip will handle bo...
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I see them as being very much alike by being completely different. You can't hand off from amps to anything because it is so arcane, and there was simply nothing to hand off to when it was designed... But the analogy stands,... They are two separate incompatible networks (just as UTMS and GSM are).If you build a AMPS/CDMA cell, you need twice the equipment to put in the little VZW shack at the base of it. In the shack next door to that if you want UTMS and GSM on that cell, you also need twice the equipment.
This is unlike the CDMA progression is all i'm saying. If you install EVDV on a site, you do not also need to install 1xRTT,... the same equip will handle bo...
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Will GSM carriers EVER have to pay Qcom for technology?
If not. I'm guessing it will be a different CDMA and not the same at all. I cannot imagine GSM carriers and phone makers all deciding to accommodate Qualcom's technology around the world.
Unless they do there will be difference in technologies..no?
If not. I'm guessing it will be a different CDMA and not the same at all. I cannot imagine GSM carriers and phone makers all deciding to accommodate Qualcom's technology around the world.
Unless they do there will be difference in technologies..no?
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Nope,... W-CDMA is a competing technology from Qualcomm's CDMA2000 standard.
CDMA2000 specifically was designed by Qualcomm, and in it's evolution path lies 1xEV-DO, and Motorola's 1xEV-DV.
UTMS/WCDMA is a European derivative, and shares only the fact that multiple users on the same channel are affected by assigning them a code (code division), and therefore Qualcomm has no ownership rights.
I may be wrong in this, but Qualcomm doesn't collect on all CDMA products anyhow. I know LG, Audiovox, Samsung and of course Kyocera (formerly Qualcomm's handset division) use Qualcomm CDMA2000 chip sets in the circuits of their products. Motorola has their own chips they use in some of their products, as does Nokia. Most likely why it's hard t...
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CDMA2000 specifically was designed by Qualcomm, and in it's evolution path lies 1xEV-DO, and Motorola's 1xEV-DV.
UTMS/WCDMA is a European derivative, and shares only the fact that multiple users on the same channel are affected by assigning them a code (code division), and therefore Qualcomm has no ownership rights.
I may be wrong in this, but Qualcomm doesn't collect on all CDMA products anyhow. I know LG, Audiovox, Samsung and of course Kyocera (formerly Qualcomm's handset division) use Qualcomm CDMA2000 chip sets in the circuits of their products. Motorola has their own chips they use in some of their products, as does Nokia. Most likely why it's hard t...
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Then it would appear GSM is at a huge advantage if they are both using CDMA technology as some have stated and/or CDMA will be the eventual winner.
Verizon will always have to pay royalties but Cingular and the rest won't?
Verizon will always have to pay royalties but Cingular and the rest won't?
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Not really.... Since verizon doesn't manufacture equipment, they aren't paying royalties.
The phone manufacturers are...
As for the equipment Verizon uses on their network, They mainly use Lucent Technologies stuff, which developed the CDMA2000 standard with Qualcomm, and therefore I'd imagine as being a developing partner, they are not paying royalties either.
The phone manufacturers are...
As for the equipment Verizon uses on their network, They mainly use Lucent Technologies stuff, which developed the CDMA2000 standard with Qualcomm, and therefore I'd imagine as being a developing partner, they are not paying royalties either.
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I have heard that Verizon pays royalties on all CDMA equipment they deploy. This could be wrong but I've heard it several times before.
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A little "self coaching" is in order here. I ought not post what I speculate to be true.
Yes, There are royalty rights that will need to be paid by manufacturers that wish to use the W-CDMA/UMTS air interface. (per Qualcomm)
And as for the bit about not all manufacturers using Qualcomm chipsets, that is true. HOWEVER, they all DO have to license the technology from Qualcomm. It is just a matter of to what degree they liscence it. It matters not wheather they purchase the chipsets from Qualcomm directly, develop and manufacture their own, or purchase them from a 3rd party.
So, as GSM moves it's air interface over to W-CDMA/UTMS and HSPDA, they will pay.
I did some learning on Qualcomm's website regarding licensing and what not. Li...
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Yes, There are royalty rights that will need to be paid by manufacturers that wish to use the W-CDMA/UMTS air interface. (per Qualcomm)
And as for the bit about not all manufacturers using Qualcomm chipsets, that is true. HOWEVER, they all DO have to license the technology from Qualcomm. It is just a matter of to what degree they liscence it. It matters not wheather they purchase the chipsets from Qualcomm directly, develop and manufacture their own, or purchase them from a 3rd party.
So, as GSM moves it's air interface over to W-CDMA/UTMS and HSPDA, they will pay.
I did some learning on Qualcomm's website regarding licensing and what not. Li...
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My opinion is that unless you are running a specific application that is dependent on the technology, don't sweat it. In other words, where you live and work, a GSM carrier may be your best choice due to their coverage in those specific areas. Then again, it may be CDMA. For those of us who travel domestically, Verizion is the clear winner as they are that good.
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