# LTE Support in UMTS SDK for Windows

**URL:** <https://forum.sierrawireless.com/t/lte-support-in-umts-sdk-for-windows/5442>\
**Category:** Around the water cooler\
**Created:** [February 8, 2012, 5:37pm UTC](https://forum.sierrawireless.com/t/lte-support-in-umts-sdk-for-windows/5442 "2012-02-08T17:37:04Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![warreneblackwell](https://avatars.discourse-cdn.com/v4/letter/w/d26b3c/32.png) [@warreneblackwell](https://forum.sierrawireless.com/u/warreneblackwell)\
**Post date:** [February 8, 2012, 5:37pm UTC](https://forum.sierrawireless.com/t/lte-support-in-umts-sdk-for-windows/5442/1 "2012-02-08T17:37:04Z")

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Hi,

I appreciate any pointers on the below…

I am using the UMTS SDK (SDK10\_B3153) for Windows, with a 313U USB Adapter.

I am able to find LTE-related functions defined in SwiApiGsm.h (for instance SwiGetRsrpRsrq). However, I am not able to find a corresponding definition to actually put the modem into LTE mode.

Iwas hoping to find (in SwiStructsCm.h), definitions such as:  
SWI\_TYPE\_RadioType::SWI\_RADIOTYPE\_lte  
SWI\_TYPE\_RadioBand::SWI\_RADIOBAND\_Lte  
#define SWI\_RADIOBANDGROUP\_lte700

However, nothing of this type is defined – only the GSM, CDMA and UMTS variants of these.

Also, when I use the AT command !BAND to query the list of supported bands on AT&T’s rebranded 313U, I do not see any 4G/LTE option:  
Index, Name  
01, Europe 3G  
02, North America 3G  
03, Europe 2G  
04, North America 2G  
05, GSM ALL  
06, Europe  
07, North America  
08, WCDMA ALL

Anyone know how I can put the modem into LTE mode?

Thanks in advance for any help.

-Warren

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**Author:** ![lotam](https://avatars.discourse-cdn.com/v4/letter/l/958977/32.png) [@lotam](https://forum.sierrawireless.com/u/lotam)\
**Post date:** [February 9, 2012, 8:09am UTC](https://forum.sierrawireless.com/t/lte-support-in-umts-sdk-for-windows/5442/2 "2012-02-09T08:09:47Z")

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Hi Warren,

Are you sure AT&T allow you to configure this? As you mentioned it is customized for AT&T… Maybe you can check with AT&T why your AC313U failed to register in LTE mode?

L

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**Author:** ![warreneblackwell](https://avatars.discourse-cdn.com/v4/letter/w/d26b3c/32.png) [@warreneblackwell](https://forum.sierrawireless.com/u/warreneblackwell)\
**Post date:** [February 9, 2012, 6:47pm UTC](https://forum.sierrawireless.com/t/lte-support-in-umts-sdk-for-windows/5442/3 "2012-02-09T18:47:29Z")

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> [@lotam](#):
>
> Hi Warren,
> 
> Are you sure AT&T allow you to configure this? As you mentioned it is customized for AT&T… Maybe you can check with AT&T why your AC313U failed to register in LTE mode?
> 
> L

Hi Lotam,

Thanks for your reply. My problem isn’t that the device has failed to register in LTE mode, but that the SDK itself does not provide the necessary functionality for me to even attempt to do so. I also observe that I can not do so via AT commands either.

I have been informed that the current version of the SDK does not support putting the modem into LTE mode (although, curiously, a function for measuring LTE RSRP and RSRQ is provided).

Thanks,  
Warren

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**Author:** ![lotam](https://avatars.discourse-cdn.com/v4/letter/l/958977/32.png) [@lotam](https://forum.sierrawireless.com/u/lotam)\
**Post date:** [February 10, 2012, 1:49am UTC](https://forum.sierrawireless.com/t/lte-support-in-umts-sdk-for-windows/5442/4 "2012-02-10T01:49:12Z")

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Hi Warren,

Sorry for miss understand.

From !BAND response you mentioned, looks like no LTE options which maybe caused by the AT&T customization (?).  
I don’t have that modem so I make such guess…

Anyway, if that’s not carrier restriction, you may find some hints for !BAND in AT cmd guide… 🙂

L