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Bijoy - 29th November 2018  (08:14 GMT)

Hi Hikmat
An RA is used by SGSN to manage the location of MS's.

An LAC is used by MSC/VLR to manage the location of MS's.

Please check the PS Paging related counters,if no PS paging discards,continue with the same config. Else,make RAC=LAC

Hikmat - 26th November 2018  (09:04 GMT)

I work in a telecom company, here they are using same RAC 300 DEC for all cells. Please what are risks? (normally one LAC contains 2 to 6 RAC)
Can paging be impacted ?

Tejaswi RS - 14th September 2017  (18:43 GMT)

Difference for LAC and RAC

paul - 29th January 2016  (13:35 GMT)

I am looking for a code (*#oooo#) for any smartphone any network in the UK so I can find out the RAC of a given site.

many thanks in advance


Sreevalsan - 27th June 2014  (13:23 GMT)

What is the difference between SAC and LAC?


Nalini - 19th December 2011  (11:32 GMT)

What do you mean by Erlangs

Hamidullah Mohammad RIAZ - 21st July 2011  (09:18 GMT)

Hello friends,
Let me tell something about RAC and LAC.
LAC (Location Area Code) is a unique code which is used for calling of the gathering of the tens or hundreds of Base Stations into a single BSC(Base Station Controller).
A subdivision of the LA is called RA(Routing Area) is used by the mobiles which are GPRS attached and the RAC(Routing Area Code) is the code for the calling and differing of various RAs.

R - 16th August 2008  (10:41 GMT)

Hi Mirmar

Usually we keep LAC = RAC .

There are no risks in keeping that configuration, rather it is the best and prefered configuration.

One LAC may contain 2 to 6 RACs but that is not prefered since it may lead to unnecessary RAC updates and thereby increasing the signalling load.

The moving GPRS traffic is usually low . If however, the GPRS signalling load increases then one RAC can be splitted into two.


Mirmar - 15th August 2008  (09:56 GMT)

Hello every body,

I am working with an operator (ALCATEL BSS) having LAC=RAC for all cells. Please what are risks of LAC=RAC ? (normally one LAC contains 2 to 6 RAC)
Can paging be impacted ?


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Last modified: 17 May 2017

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