NSN problem of 0 kbps on HSDPA

[josef]

Dear borthers,

In our network, we have many complain about throughput on HSDPA. The problem is that throughput went many times from good value to 0 kbps and it stay on this value. After restarting the session, the same problem appear.

What can be the reasons of this problem? If the problem is related to radio, Is there any radio parameters related to this issue that we can test?

Thanks for your help

Josef.

[elkador]

Vendor, release, technology deployed?
Any specific handset impacted, or all of them?

[josef]

Vendor, release, technology deployed?
Any specific handset impacted, or all of them?

Vendor: NSN
Release: RU10
Technology: HSDPA/ HSUPA U900 & U2100

all the handsets are impacted.

Thanks bro

Josef

[redrooster]

Need more information

Is this on just one cell or more? Is it constant? In addition, what is the voice traffic load at the time? Obviously if all the "codes" are being used for voice none are available for HSDPA (8 voice calls equates to one hsdpa code).

Cheers

Redrooster

[EJAY]

Hi Josef,
THere are several reasons for that problem.
- number of users
- capacity- ce iub, etc
- sgsn/ core problem
check first all ur parameter. WBTS parameter and RNC parameter.

Regards,
EJAY

[ash_or]

Hi josef..
have you try to check on core/sgsn/ggsn
maybe there some limitation

[s52d]

Hi Josef,
THere are several reasons for that problem.
- number of users
- capacity- ce iub, etc
- sgsn/ core problem
check first all ur parameter. WBTS parameter and RNC parameter.

Regards,
EJAY

How about IuB? If signalling is OK, but no user plane, you get happy 0 kbit/sec users.
And terminals do not want to pick another cell: signalling is OK!

This is common with dual stack IuB: signalling via ATM (normally works),
and user plane via IP, where some IT people never learned how NOT to mess with
routing etc....

BR
s52d

[syeddawer]

1. First of all, since ur network is deployed and u do get down/upload of data, i dont guess there is a problem with the user plane.

2. Radio: You need to check at what instances this data outage occurs. Which cells are impacted. what is the traffic trend and network utilization shares of these cells. Also check AC statistics.

3. Packet Core: You need to check the utilization of Gi/Gn Interfaces (Gi specially). I strongly suspect somewhere on ur Packet Core, a network element is dropping packets, being heavily oveutilized. It can be the firewall even. Your routers/switches can be hitting 100% utilization, hence the packet drop.

Hope this helps.

Br..
D

[josef]

Need more information

Is this on just one cell or more? Is it constant? In addition, what is the voice traffic load at the time? Obviously if all the "codes" are being used for voice none are available for HSDPA (8 voice calls equates to one hsdpa code).

Cheers

Redrooster

This problem appear in many cells. but You can not produce it in some nodeBs. for voice traffic, we don't have so much in 3G. mainly 2G voice. so I don't think that is because of voice load.

Thanks man

[josef]

Hi Josef,
THere are several reasons for that problem.
- number of users
- capacity- ce iub, etc
- sgsn/ core problem
check first all ur parameter. WBTS parameter and RNC parameter.

Regards,
EJAY

All parameters are Ok. Iub capacity is ok (dual Iub with MPR 177 Mbps)

I don't think that is can be radio problem, because just some secondes before having this problem you can reach 2.7 Mbps !!!