Some queries regarding the GSM

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Saurabh - 07 Mar 2006 03:57 GMT

Hi,

I have some queries regarding the GSM.

What are the Layer1 and layer 2 functions?
How a data packet filters?
How the systems recognize whether the data packet is of data or control
signal?
What are the role of DLP at layer2?
What are the role of Length identifier and Fill bits?
Difference between A, B Abis and Bbis LAPDm frame format?

Regards,
Saurabh

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John Navas - 07 Mar 2006 04:17 GMT

>I have some queries regarding the GSM.
>
[quoted text clipped - 5 lines]
>What are the role of Length identifier and Fill bits?
>Difference between A, B Abis and Bbis LAPDm frame format?

GSM technical documentation is freely available at etsi.org

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Best regards, SEE THE FAQ FOR CINGULAR WIRELESS AT
John Navas <http://en.wikibooks.org/wiki/Cingular_Wireless_FAQ>

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Antti - 07 Mar 2006 21:36 GMT

> [POSTED TO alt.cellular.gsm - REPLY ON USENET PLEASE]
>
[quoted text clipped - 9 lines]
>
> GSM technical documentation is freely available at etsi.org

And also at 3GPP website, see e.g. http://www.3gpp.org/specs/numbering.htm

In this case where GSM and its L1 and L2 are in question, the 05.xx and
04.xx specifications should be the most relevant ones.

Regards,
Antti

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Saurabh - 08 Mar 2006 03:37 GMT

Hi,

Perhaps I am referring the following books, but I am not getting clear
picture in detail.

1. Neil J. Boucher, The Cellular Radio Handbook, Second Edition,
Mendocino, California: Quantum Publishing, Inc.
2. George Calhoun, Wireless Access and the Local Telephone
Network,
Norwood, Massachusetts: Artech House, Inc.
3. An Introduction to GSM: Siegmund M. Redl, Matthias K. Weber,
Malcolm
W. Oliphant
4. GSM Switching, Services and Protocols: Jorg Eberspacher,
Hans-Jorg
Vogel, and Christian Bettstetter

I will dig in specifications, hope will get something.
By the ways, thanks to all for support and suggestions.

Regards,
Saurabh

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