- This topic has 18 replies, 1 voice, and was last updated 9 years, 3 months ago by pix.
21st July 2010 at 07:25 #63656Huawei – ManGuest
Routing Area Code (RAC) in Huawei.
If it is distributed between cells without plan. For example RAC-0 is located between RAC-41.
In this case how does it affect to network and how should be the RAC planning???21st July 2010 at 08:02 #63657pixGuest
every time the MS reselects a cell which has a new Routing area code or routing area color, then it will do a routing area update.
impact : signalling load on the SGSN, TBF / PDCH usage on the air interface, etc. it is highly recommended to reduce the number of RA update !
typical solution :
within one LAC, use only one RAC : all cells in this LAC shouldshare the same ra code and ra color.
in next LAC, use another RACode and RAColor.
pix21st July 2010 at 08:29 #63658routing areaGuest
I have a question, what are the drawbacks if we use one RAC for whole network?21st July 2010 at 09:48 #63659pixGuest
i think that there is no problem : there will still be 1 RAC per LAC. Indeed, when there is a change of LAC, even if the RA code and colour are identical, the “routing area identity” is changed
(RAI = LAC + RAC)
So it should be safe to do that (1 RAC for the whole network). Any other opinion on the matter are welcome !
However I never tried this. To play safe, I always preferred to distinguish rAcode and RAcolor between different LAC.
pix21st July 2010 at 10:03 #63660Huawei – ManGuest
What is difference between Routing Area Code and Color?21st July 2010 at 11:45 #63661pixGuest
just the way they are broadcasted on the BCCH : color is broadcasted very often, code is broadcasted once in a while only.
Don’t worry about this too much. The only thing that matters is that code and color are different between 1 RA and all its (immediately) adjacent RA.
pix22nd July 2010 at 04:36 #63662Huawei – ManGuest
Does RA update affect to SDCCH overloading?22nd July 2010 at 07:19 #63663pixGuest
no, the RA update is done on the PDCH (the MS establishes a UL TBF, etc etc), it is not using a SDCCH channel.
pix22nd July 2010 at 10:42 #63664Kamal KotechaGuest
R u crazy..?! We cannot use same RAC for whole n/w..
Even inter PAPU RAC should be unique..
How can whole n/w served by one RAC…? Except your n/w is being served by one papu only…(like my Old city..! he he ..)22nd July 2010 at 10:53 #63665Kamal KotechaGuest
Did I missed something..?!
Sry You know Quarter of Smirnoff did that..
You can use it by implementing LRAS(Large Routing Area Support) feature..!22nd July 2010 at 13:40 #63666pixGuest
you assign one RA code and colour on the whole network.
But in the end, one Routing Area is defined by RAI
RAI = LA code + RA code
So there are as many RA as there are LA ! Even though only one code is used.
I hope I am clear.
and I hope I’m not crazy…
Now as i said this approach is weird : it *should* work, but I never tried it.23rd September 2010 at 05:45 #63667Yuki ArifGuest
PIX is correct…
Routing Area Update Procedure is initiated when the mobile change RAI. Not by changing RAC….
There is one big/famous BSC supplier where the RAC is hard coded to 1.
Can not be changed…
…10th October 2010 at 12:39 #63668AyatGuest
in our case we have 2 LAC with the same ID 9108 but in different BSC in Different MSC
could you expilan?8th December 2010 at 22:25 #63669AshrafGuest
I agree with you pix. It should e safe to use the same RAC for the whole network since you will assign different LAC per BSC/RNC9th December 2010 at 09:18 #63670santosh nayakGuest
what is PBGT handover what are the parameter