how to improve the HSDPA cell throughput

[tareq1010]

Dear expert,
plz share your idea to improve the HSDPA cell throughput. iam talking about the HSDPA cell throughput not user throughput.
in our network the customer need the HS cell throughput higher than 2.3Mbps and thecurrent HS cell thoughput is 1.9Mbps.
is the number of HSCCH codes effect on Cell throughput.

the current configuration in our network as below:
-we have two carerier, first carreir for voice, R99 and HSDPA HSUPA and second carrier for HSDPA and HSUPA only.
-code allocation in RNC in static with 5 codes and it is open on NodeB level.
-4 HSCCH code.
-the power utilization is ok.
-the IUB and IUPS utilization is OK.
-IUB link are over IP.
-max number of HSDPA users is 64
-64QAM and other HSPA+ features are enabled.
-load balancing and Service DRD are enabled.
-Huawei equipment RAN 12 RNC6900 and NodeB 3900

plz share any idea to improve the HS Cell throughput.

[melkaiy]

sirs, check the channelization codes if set at correct parameters. i hope this one helps...(please add reputation) thanks

[adewijaya]

Dear expert,
plz share your idea to improve the HSDPA cell throughput. iam talking about the HSDPA cell throughput not user throughput.
in our network the customer need the HS cell throughput higher than 2.3Mbps and thecurrent HS cell thoughput is 1.9Mbps.
is the number of HSCCH codes effect on Cell throughput.

the current configuration in our network as below:
-we have two carerier, first carreir for voice, R99 and HSDPA HSUPA and second carrier for HSDPA and HSUPA only.
-code allocation in RNC in static with 5 codes and it is open on NodeB level.
-4 HSCCH code.
-the power utilization is ok.
-the IUB and IUPS utilization is OK.
-IUB link are over IP.
-max number of HSDPA users is 64
-64QAM and other HSPA+ features are enabled.
-load balancing and Service DRD are enabled.
-Huawei equipment RAN 12 RNC6900 and NodeB 3900

plz share any idea to improve the HS Cell throughput.

I think, your HSCCH code too less for improving cell throughput, otherwise licence of HSPA+ already activated

[hari_2208]

Try to find parameter regarding nodeb schedulars,which allocate resources in node-b....which exploits different conditions to give max throughput.

[hesh]

Dear expert,
plz share your idea to improve the HSDPA cell throughput. iam talking about the HSDPA cell throughput not user throughput.
in our network the customer need the HS cell throughput higher than 2.3Mbps and thecurrent HS cell thoughput is 1.9Mbps.
is the number of HSCCH codes effect on Cell throughput.

the current configuration in our network as below:
-we have two carerier, first carreir for voice, R99 and HSDPA HSUPA and second carrier for HSDPA and HSUPA only.
-code allocation in RNC in static with 5 codes and it is open on NodeB level.
-4 HSCCH code.
-the power utilization is ok.
-the IUB and IUPS utilization is OK.
-IUB link are over IP.
-max number of HSDPA users is 64
-64QAM and other HSPA+ features are enabled.
-load balancing and Service DRD are enabled.
-Huawei equipment RAN 12 RNC6900 and NodeB 3900

plz share any idea to improve the HS Cell throughput.


As per your setting everything goes fine..even 4 HSCCH is also fine, even if you want to improve HSDPA cell throughput then try to increase HSPDSCH code number from 5 to something 7 or 8 and check.

"open on NodeB level" that means on NODE B level it is "Dynamic allocation"..right??if this is the situation then only way to have increase code numbers...

[tareq1010]

yes, the code allocation in the node B level is dynamic,, i tried before to increase the number of codes to 10 in the second carrier but the there was no improvement on the cell throughput. with strategy, the minmum codes is 10 and if there is free codes, they can use it also as the nodeB level is dynamic.

[adewijaya]

1. Review the counter
2. Make it dedicated/cell HSPDSCH code

[hesh]

yes, the code allocation in the node B level is dynamic,, i tried before to increase the number of codes to 10 in the second carrier but the there was no improvement on the cell throughput. with strategy, the minmum codes is 10 and if there is free codes, they can use it also as the nodeB level is dynamic.


"minmum codes is 10" you mean to say @RNC level Alloccodes is "Automatic" coz in Manual(Static) coding setting there is no minimum or maximum.

[tareq1010]

if you put the code allocation is static 10 codes in RNC level and the code allocation is automatic in NodeB level, this mean the minimum codes you can get is 10 and if there is more free code, you can use it.

[adewijaya]

if you put the code allocation is static 10 codes in RNC level and the code allocation is automatic in NodeB level, this mean the minimum codes you can get is 10 and if there is more free code, you can use it.

that i said before, make it dedicated per sector. it's hard to achieve this if you still using shared code

[andoniwireless]

Hi, in your formula, how is the value of symb..?

[MHDRF]

did you try to set 2 hscch instead of 4

[gprastomo]

Try following :
1. implement 46 dBm/40 watt PA per cell
2. maximize pdsch code to 15 code per cell
3. reduce HSSCCH code to 2
4. Reduce inter freq neighbour and inter rat neighbour to reduce CM which affect the power.
5. increase the Bandwidth of IuB

[paulus]

Hi..

1. If Iub is already IP, check whether it's already pass directly to MSTP (the physical BW should be minimum 15 Mbps, in my network, it's 32/40 Mbps direct to MSTP)
Some nodeBs, perhaps are connected to other nodeBs (although IP), which mostly, it's Physicall Iub capacity is not equal to configuration.
2. Put "alllocate mode" to "automatic", and max HSPDSCH code to 15 codes.
This is based on theory :
Throughput = (ChipRate/SF) x bits per Symbol x coding rate x Nb of codes
Throughput HSDPA 15 Code = (3,84x 10 pangkat 6)/16 x 4 x 1 x 15 = 14,4 Mbps
Putting "manual" on allocate mode will have a higher possibility for code congestion


Br,

Paul

[bino]

Hi,

I think, configuration in your network is ok (like our network).
Here's some ideas about factors that impact to HSDPA performance
26092

[giegala]

check out ACK/NACK ratio of HSDPA counters in nodeB. NACK % should be about 10%. much higher or lower values shows that scheduler is not working on optimum.

[firstmaxim]

How about assigning dynamic power allocation to the HS-SCCHs. This should make available the surplus power to the HS-DSCHs.

[firstmaxim]

Please go through some of the features like Continuous Packet Connectivity (CPC), blind HS-SCCH detection that can be implemented in HSPA+. The resulting power saving/reduced interference should improve cell throughput.

[firstmaxim]

Agree, ACK NACK power optimization is also crucial for maximizing HSPA thoughput. If there is ACK failure, we would just have a retransmission. A NACK failure is disastrous because this would invoke RLC layer retransmissions from RLC, which will add to further latency and more retransmissions.

[WCDMA/HSPA]

Try following :
1. implement 46 dBm/40 watt PA per cell
2. maximize pdsch code to 15 code per cell
3. reduce HSSCCH code to 2
4. Reduce inter freq neighbour and inter rat neighbour to reduce CM which affect the power.
5. increase the Bandwidth of IuB

Yes, reduce HO frequently ( include event 1d) will help to improve the HSDPA throughput.

br,

[firstmaxim]

Another method is to enable Proportional Fair Scheduler. The cell throughput is higher compared to Round Robin, for LOS and multipath, pedestrian and vehicular environments.

[jan74]

You can check what algorithm is used for HSDPA Scheduling. If using Round Robin, this emans each user is served in turn regardless of rf conditions. This helps users on cell edge but keeps cell throughput low. If you use Proportional Fair, where rf conditions are taken into account in the scheduler, users in good rf get served more and also improves cell throughput. Not sure what the setup is with Huawei but maybe they allow different types?

Regards

PS. Sorry FirstMaxim. I never saw your comment!

[ali.benc]

Find below some idea which can help to iimprove your HSDPA throughput:

1) you can first check the available license on the Node B
2) You can make the allocation of hspdsch codes dynamic on cell level, and allocate the max=14 and with HSSCCH=4
3) Check the RF condition if there is any poor EcNo try to clear it ( check any interference, check RTWP....)
4) Check availibility of CE and Power ask for board expansion if any congestion is there
5) Check the User Cat on your network and ask the customer to activate DC-HSDPA but this require to have two carriers HSDPA so you may need to have a third carrier which not easy


Ali

Please quote if you found interesting

[elkador]

I would suggest to set both frequency to R99 & HSPA.
Having one freq dedicated to HSPA does not necessarily help the cell thxput.

Less handover between F1 and F2 will help your overall user exp. and raise the thxput.

[dimooon11]

One of the ideas is to set more aggressive thresholds for Entry and Exit for modulation schemes and let the system to compensate increased BLER with HARQ.
These thresholds has to be analyzed on per-sector basis and there is need to pay close attention to NACK ratio and changes in delay.