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Arun Demeure

Hi Martin, I suspect the reason why there is no multimode mention yet is that the Qualcomm chipsets will only start sampling in the middle of this year. I believe the only solution that is already sampling is Ericsson's M700, which is LTE only; it can be paired with a HSPA baseband for multimode but presumably not a Qualcomm CDMA one.

I suspect that is what they will start with and Qualcomm chipsets will come very shortly afterwards, maybe even before commercial deployment (or maybe not). Qualcomm will probably remain the only multimode baseband provider with CDMA for some time, although I've heard there might be at least one alternative eventually...

Arun Demeure

BTW, I've got a question for you. I found your HSPA+ posts very interesting as well as the graphs you linked, so I was wondering if you might know how might know how frequent backhaul bottlenecked networks are compared to spectrum bottlenecked networks, and how this might affect the speed and/or usefulness of HSPA+ deployments.

Clearly adding HSPA+ to handhelds in the 2H10 timeframe is feasible, but seems only justifable to me if it has a real bandwidth benefit and/or gets you more operator subsidies because of the higher spectrum efficiency. Do you believe either or both of those are likely?

hyao

AT&T's 700MHz is 3GPP Band 17 which is different.

Martin

Hi Hyao,

Thanks for your comment! I had a closer look and found the following:

Verizon got the C-Block which is 746-757 (downlink) and 776-787 (uplink, give or take a MHz). That's 3GPP band 13.

AT&T won the B-Block and together with the spectrum they bought from Aloha wireless that should be somewhere around 704-716 (uplink) and 734-746 (downlink). As you say, that looks like 3GPP band 17.

It's interesting that down/uplink frequencies are flipped between these two bands!

So I wonder whether it will be possible to manufacturer a single transcievers for band 13 + 17, or if Verizon and AT&T get their own hardware variants, or if it will economically be more feasible to manufacture devices with two transcievers.

And of course on top, which other bands will 700 MHz devices support for LTE and other technologies to support national roaming to CDMA (Verizon) and HSPA(AT&T) networks and of course international roaming. I'd say that's a formidable challenge.

Cheers,
Martin

Two links for further background info:

http://wireless.fcc.gov/auctions/data/bandplans/700MHzBandPlan.pdf

http://en.wikipedia.org/wiki/United_States_2008_wireless_spectrum_auction

Martin

Hi Arun,

I guess it wouldn't make much sense to upgrade to a higher speed on the air interface while leaving the backhaul as it is or vice versa. But I have no info if this is the case today anywhere. It's a bit difficult to test as one would have to have at least 2 notebooks in each of the 3 sectors and, in case of Vodafone in the UK in cities, two per carrier per sector, which makes 12, to really test things. A bit beyond my possibilities :-)

Kind regards,
Martin

Bob Syputa

From the looks of the spec and comments on the VZ openDevelopment web board, Verizon won't define requirements for multiple mode operation. And I don't know how they could do that and live within the FCC requirements for open access and open devices.

Bob Syputa

Verizon has left much to the imagination as might be expected.

1 - They have to operate within the FCC open access and open device requirements for the AWS 700 C-Band. In response to questions raised following Verizon's comments about how open they intend to make the network, the FCC said at the OpenMobile Summit last winter that they intend to enforce these requirements vigorously.

2 - This likely means that VZ won't require but cannot restrict VoIP. Seems to me that they could set guidelines to assure good operation but since they cannot control the revenue from VoIP on open devices, they might have little motivation to help out the competition to their own LTE-VoIP.

3 - My understanding is that handoff between LTE and LTE, CDMA, 2G, 3G and even, heaven forsake Verizon, WiMAX, networks will be defined by the referenced 3GPP specifications. Since this is very important to user experience, particularly if used in a mixed service offering, VZ will probably test rigorously. But there is a question of how much VZ needs to offer to the open developer community. It is very certain that they will work with their network partners, Alcatel-Lucent and Ericsson and major handset providers for Verizon labeled devices and multiple mode service within the Verizon network. But they won't likely have much motivation to spend money to enable developers to work out the kinks for other operators to hand-off and roam their LTE network.

I'm doing creative speculation since some details remain unknown. I've asked VZ for details on many aspects of the development but they have not been overly forthcoming as of yet.


Bob Syputa

I posted a list of references and will have an short article on this subject out this week:
http://www.agglom.com/set/65849/What_We_Read_from_the_Verizon_700_MHz_C_Block_LTE_Specifications

BTW, the agglom site is a good way to save commented links to sources. Groups can also be allowed to add to a set of links which could be useful for collaboration on articles, books, and research work.

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