HSUPA mean UE number limited to 20 !!

[fahmi]

Dear All,

When analyzing some cells I notice this strange behavior:


The HSUPA UE mean number is limited to 20 UEs while the max is up to 25 UE.
THE HSUPA MAX UE number parameter is set to 40.


32262


A real time trace confirm this behavior


32263

What could be the reason behind this limitation in the UL ?

BR,
Fahmi

[khurrambilal01]

Dear All,

When analyzing some cells I notice this strange behavior:


The HSUPA UE mean number is limited to 20 UEs while the max is up to 25 UE.
THE HSUPA MAX UE number parameter is set to 40.


32262


A real time trace confirm this behavior


32263

What could be the reason behind this limitation in the UL ?

BR,
Fahmi


Hi my friend,
Once we increase HSUPA Max user greater than 20/25 then we need to increase the codes associated with HUSPA logical channels E-AGCH, E-HICH, E-RGCH.
If we don't increase the codes then HUSPA user number never goes beyond 20-25.

Increase Code Number for E-RGCH/E-HICH,
Use below command:

//Allocating code resources to E-RGCHsMOD UCELLHSUPA: CellId=xxx, ErgchEhichCodeNum=3;

[pongpang]

Hi my friend,
Once we increase HSUPA Max user greater than 20/25 then we need to increase the codes associated with HUSPA logical channels E-AGCH, E-HICH, E-RGCH.
If we don't increase the codes then HUSPA user number never goes beyond 20-25.

Increase Code Number for E-RGCH/E-HICH,
Use below command:

//Allocating code resources to E-RGCHsMOD UCELLHSUPA: CellId=xxx, ErgchEhichCodeNum=3;

Addition!!!
[ErgchEhichCodeNum*20]>=MaxHSUPAUserNum

[fahmi]

Dear khurrambilal01 (http://www.finetopix.com/member.php?65308-khurrambilal01) & pongpang (http://www.finetopix.com/member.php?34064-pongpang) :

After increasing the codes associated with HUSPA logical channels E-AGCH, E-HICH, E-RGCH (MOD UCELLHSUPA: CellId=xxx, EagchCodeNum=2, ErgchEhichCodeNum=2) , the number of HSUPA UE number has increased up to 35.

32298

But when allocating more code this mean more power will be allocated to these channels. isn't ?
Could this degrade the CSSR or any other potential impact ?

BR,
Fahmi

[muhammadbillal]

Guys I am also facing a similar issue but with the mean HSDPA UE number. The maximum set as per parameters is more but it reaches a max of around 32. What parameter needs to be changed in order to increase it ??

[fahmi]

Just for details, why we rae limited to 20 UEs with ErgchEhichCodeNum=1 :

The E-RGCH and E-HICH share the same code space in the OVSF tree. Orthogonality between the two channels is provided by the use of orthogonal 40 bit signatures that can be transmitted as-is or inverted to signal +1 or -1. Not transmitting a signature in a TTI results in a 0 being assumed by the UE (this is also called DTX in the specifications). The definition of the E-HICH and E-RGCH channels provide the mapping from -1, 0, +1 to the logical values of Up/Down/Hold or ACK/NACK. As there are a total of 40 orthogonal signatures available it is possible to multiplex up to 20 UEs onto a single E-HICH/E-RGCH OVSF code.

[eric4good]

Increasing HSUPA user number allowed in your system will consume more UL resources, therefore close attention to UL congestion of CE, power should be paid, of course thats among other other metrics like R99 traffic, RTWP etc..

[khurrambilal01]

Dear khurrambilal01 (http://www.finetopix.com/member.php?65308-khurrambilal01) & pongpang (http://www.finetopix.com/member.php?34064-pongpang) :

After increasing the codes associated with HUSPA logical channels E-AGCH, E-HICH, E-RGCH (MOD UCELLHSUPA: CellId=xxx, EagchCodeNum=2, ErgchEhichCodeNum=2) , the number of HSUPA UE number has increased up to 35.

32298

But when allocating more code this mean more power will be allocated to these channels. isn't ?
Could this degrade the CSSR or any other potential impact ?

BR,
Fahmi

Yes!
Your UL resources are utilized more now, RTWP can increased, you can get ENU congestion if you are using Algo 2 for UL CAC,
You can get BErate reduction/Inter freq/IRAT handover due to more load on UL if LDR is enabled.

[Muhammad Imran Rafique]

hi Bilal,

such problem is possible in E// as well?

BR/
Imran