DL Power congestion

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2012-01-20, 05:10 AM
tek74

DL Power congestion

Hi Experts,

We put 70% DL load for DT purpose on all the cells of one of our cluster (still not commercial). We had a HSDPA connection that seems to take all the remaining DL power up to 95% of Total power (power offset is 5%). Then when we try to start as CS call, will the HSDPA power be reduced in order to accept this CS call (CAC access threshold for AMR call is 80%) ? What is the algorithm that is going to reduce the HSDPA power in order for the CS call not to be rejected ? How does it work with CAC algorithm ?
The point is that we have many Call Setup Failure for DL power congestion with 70% load+1HSDPA+1HSUPA and then 1 CS trying to access.

Do you have any idea on that? Is it normal considering the load ? If not what parameters (HSDPA, CAC, Power Control...) that could overcome the problem ?

Thanks,
TEK.
2012-01-20, 02:15 PM
kin12345

Re: DL Power congestion

Quote:

Originally Posted by tek74

Hi Experts,

We put 70% DL load for DT purpose on all the cells of one of our cluster (still not commercial). We had a HSDPA connection that seems to take all the remaining DL power up to 95% of Total power (power offset is 5%). Then when we try to start as CS call, will the HSDPA power be reduced in order to accept this CS call (CAC access threshold for AMR call is 80%) ? What is the algorithm that is going to reduce the HSDPA power in order for the CS call not to be rejected ? How does it work with CAC algorithm ?
The point is that we have many Call Setup Failure for DL power congestion with 70% load+1HSDPA+1HSUPA and then 1 CS trying to access.

Do you have any idea on that? Is it normal considering the load ? If not what parameters (HSDPA, CAC, Power Control...) that could overcome the problem ?

Thanks,
TEK.

You might need to try to reduce the power congestion for that site such as using adjacent sites to offload the traffic( downtilt or uptilt) from the site that has power congestion. What about 2nd carrier upgrade or double the the power for that particular site?
2012-01-21, 06:30 AM
jayk

Re: DL Power congestion

Quote:

Originally Posted by tek74

Hi Experts,

We put 70% DL load for DT purpose on all the cells of one of our cluster (still not commercial). We had a HSDPA connection that seems to take all the remaining DL power up to 95% of Total power (power offset is 5%). Then when we try to start as CS call, will the HSDPA power be reduced in order to accept this CS call (CAC access threshold for AMR call is 80%) ? What is the algorithm that is going to reduce the HSDPA power in order for the CS call not to be rejected ? How does it work with CAC algorithm ?
The point is that we have many Call Setup Failure for DL power congestion with 70% load+1HSDPA+1HSUPA and then 1 CS trying to access.

Do you have any idea on that? Is it normal considering the load ? If not what parameters (HSDPA, CAC, Power Control...) that could overcome the problem ?

Thanks,
TEK.

HsdpaMaxGBPThd is power threshold for HSDPA users and rest power is for DCH Users. Default value of HsdpaMaxGBPThd is 100%, that means all available power can be utilized for HSDPA services. You can do a trial to change this parameter.

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