Books to be referred on 3G

Posted in | at 10:38 PM

As a fresher when i joined Alcatel-Lucent, i was quite struggling with Abbreviations and jargons used in this field. Beside some words like WCDMA , SIR(which we mostly  encounter in our Engg. course) almost every word was quite stranger to me. Suggestion from senior members were to go through presentations and read 3GPP specification but I thought of switching to books first and then to spec. Now choosing book is also a tough task to start with but here are some suggestions from my side:

My personal favorites are
1.   Introduction to 3G mobile communications by Juha Korhonen
2.   WCDMA For UMTS by Harri Holma and Anti Toskala

The first one explains the physical related stuffs in a better way where as the 2nd one has protocols part and Layer2 and above related topics covered in better manner.

From the First book as a beginner chapters 8,9,10,12,13,14,15(As per the 2nd edition ) can be skipped but rest all chapters are a must read.

If you have already gone through the 1st book the content to be read from the 2nd book will be bit lesser. Chapters 12,13,14,15 (4th edition) are a must read chapters from this book as they cover HSPA and LTE related topics.

If protocols (like NBAP,SCCP,SSCOP, RANAP,FP etc etc ) used in different layers of WCDMA technology bothers you even after reading these above books (as they bothered me a lot even after reading above books) I prefer reading the book  “Convergence technologies for 3G Networks by Jeffrey Bannister,Paul Mather and Sebastian Coope”  . Chapter 6 contains all these information’s in a pleasant way. The one which bothered me most was AAL(ATM Adaption Layer) and SSCOP(I was quite scared to these two words as I was not able to find explanations explicitly dedicated to these layers). But this book contains all these information.

For Core Network related info chapter 9 of above book is also a must read.

Beside these books 3GPP specs obviously has to be read as there only you will be able to find IEs (Information elements) related to each protocols.

Some blogs also contains good information on this technology.

www.3g4g.co.uk is one of my favorite , beside those www.3gpp.org site is also a must read for keeping yourself updated with new news on 3G and 4G.

Readers are welcome to suggest another books .....

Thanks…

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3G UMTS WCDMA ........ Frequency and Bandwidth

Posted in | at 6:05 AM

Lets begin with the very first question about a mobile communication technology "frequency range and Bandwidth"

.3G UMTS WCDMA technology works in which frequency range and what is the Bandwidth allocated?

In a sum we can say that 3G UMTS WCDMA technolgy works near about 2 GHz frequency range in 5Mhz sub Bands i.e a Service provider(Like AT&T,Vodafone) can get a Bandwidth in multiples of 5Mhz. Generally spectrum is allocated as 5 Mhz for UPLINK and 5Mhz for Downlink.(in *FDD) or 10 Mhz (in **TDD).

To be specific the 3G UMTS WCDMA technology works in IMT - 2000 frequency bands which was initially 1,885-2,025 Mhz and 2,110 - 2,200 Mhz but now it has been extended further.Below picture can give you better Idea of frequency allocation.



*FDD: Frequency division duplexing: In this kind of duplexing uplink and downlink used to happen on different frequency band.(It has a draw back of inefficient use of spectrum because we are assigning same BW(Bandwidth) to uplink as well as downlink but in real scenario Uplink traffic use to be far less than Downlink traffic. )

**TDD: Time division duplexing:In this kind of Duplexing whole frequency band is allocated for uplink as well as Downlink but in a given Time slot either you can send either Uplink data   or Downlink Data. For TDD to work high synchronization needs B/W sender and receiver side.

Note:By uplink we are meaning data flow towards Base station from a User(or Mobile) where as downlink means data flow towards a user from Base station.

(For reference readers can check "Introduction to 3G Mobile communications " by Juha Korhonen)

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BASIC ARCHITECTURE OF 3G UMTS

Posted in | at 11:26 PM


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