[hungtran]

Hi PIX!
you are right, I am in vietnam. I work in viettel network. Thank for your kind.
I don’t understand clearly why you can say that SD fail, the subcribers will not “fell”?
because, they can have to try 2 or 3 times to make a call or sms? they will complain us quality of service.
Can you give me that indicator of Vinaphone or mobile?

[Pix]

Hungtran,

The user will not have to perform the call more than once to go through, even though the indicator SDCCH failure rate is “high”. Just take your experience as a reference : how many times do you have to push the “call” button to make or answer a call ? only once…

Those failures are counting the “automatic” RACH attempts of the mobiles, as well as ghost RACH, etc… If you don’t agree, then perform drive-tests and experience the SDCCH failures. You’ll see that it’ll never happen.

This threshold is always the same, whichever the network. I told you already… alcatel officially recommend a threshold of 20%.

Contact the RTAC for additional infos…

[David A.]

We have Nortel BSC & BTS equipment and have observed a sudden increase in SDCCH drop rate.

Anyone else noticed this with Nortel equipment?

[Pix]

David A.,

Do you mean you’ve rolled out a new Nortel network and you’re now observing a higher SDCCH drop rate than with the previous network ?

Network-wide, or only on one BTS ?

What is the SDCCH drop rate ? (daily average & busy hour)

[Arpan]

what can be reason of handover failure except interference or TCH assignment failure??

[David A.]

Pix,

This increase in SDCCH Drops from 0.8% to 3% occurred on an existing Nortel network. The change was observed across the network.

[Robin]

Hi,David A
Pls. check which sites SDCCH DR increased so much.IF these sites are at the same area,it is better to check ulink and dlink interference.

[Robin]

Hi,David A
Pls. check which sites SDCCH DR increased so much.IF these sites are at the same area,it is better to check ulink and dlink interference.

[dina]

Hi all,

Could you tell me the target value for SMS Success Delivery Rate ? How can we count that indicator (the formula and the trigerring point)? Do any of you have the documentation about this? I apologize if this topic doesn’t corelate with SDCCH, but I really need your help..Thanks a lot..

[Iwan Suwandi]

Hi Friends

I have problem with my site
1. I have a problem of TCH DROP Bad Quality looks acceptable from stats . SDCCH CSSR is within our KPI’s and theres is no congestion on TCH and SDCCH. I have drive test this site and during the drive test no interference found. Can some one help me

[Nitin K]

Hi IWAN,

Have you checked for the UPLINK QUALITY for the particular cell?

[Robin]

Hello,all
Help pls.
Do you have any information about mobile hangging up problem or hangging up time very long time?

[RAVI BSNL]

Hi friends,
I want to know about TCH and SDCCH congestion. Please explain

[Sachin]

Iwan,

Have u checked the C/I on the BCCH and the non-bcch carrier’s.

Check out the foll options :

1. Where is the same BCCH freq being used in the vicinity ?

2. What are the chances that it can hit ur cell and spoil the Drop call Rate ?

3. If it is being used in the vicinity then at what height are the antenna’s mounting ?

4. Try changing the freq if ur freq plan permits u to do so or try downtilting the antenna electrically ?

For more queries sachinpurswani@hotmail.com

Regards,
Sachin

[z_ali]

what are the average KPI values of should be considered to monitor the network, for NSS.

I have an assingment on NSS related KPI to optimize the network any one can help me in this regards?

[Author]

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