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white_Noise
2011-10-05, 05:40 PM
Hello Experts,

If anyone can help undertstanding why does HSUPA consume much more Channel elements (CEs) than the HSDPA does?

Thank you in advance..

boring
2011-10-05, 05:51 PM
Hi,

HSDPA is a common channel and as a result CEs are shared among users. essentially, users are multiplexed on a TTI (= 2ms) basis, and as a result the same resources (i.e. CEs) can be shared by everybody

on the other hand, HSUPA is a dedicated channel which also makes use of soft handover. This situation is similar to R99 channels: CEs must be allocated on a dedicated basis for the duration of the HSUPA session, and of course different resources are required on each Node-B participating in the HSUPA active set.

hope this helps

white_Noise
2011-10-05, 05:58 PM
Hi,

But as per my knowledge, the CE consumption for HSDPA will be zeo in case the SRB over HSPA feature was used, correct me If I'm missing anything here..

boring
2011-10-05, 06:04 PM
basically, that is correct.

because HSDPA has shared CE usage, all HSDPA users appear as if they don;t use any CE at all while in HSDPA. and this is the same not only for SRB but everything running over HSDPA

what i want to say here is that the "shared usage" is not caprtured by (for example) DL Credit usage node-b huawei counters, and this counter appears as zero. makes sense?

agenov
2011-10-05, 06:04 PM
Hi,

But as per my knowledge, the CE consumption for HSDPA will be zeo in case the SRB over HSPA feature was used, correct me If I'm missing anything here..


There are also CEs for HSDPA processing but they are reserved in the NodeB and not need any additional modifications unlike UL direction. You have 1 CEs because of associated DCH channel and in case of HSDPA over SRB of course you save it.

BR
Alex

white_Noise
2011-10-05, 06:10 PM
basically, that is correct.

because HSDPA has shared CE usage, all HSDPA users appear as if they don;t use any CE at all while in HSDPA. and this is the same not only for SRB but everything running over HSDPA

what i want to say here is that the "shared usage" is not caprtured by (for example) DL Credit usage node-b huawei counters, and this counter appears as zero. makes sense?

so in other words, the HSDPA does not need the NodeB CE "Processing" needed by the HSUPA..

boring
2011-10-05, 07:10 PM
so in other words, the HSDPA does not need the NodeB CE "Processing" needed by the HSUPA..

i don't really understand your question.

in any case, HSDPA and HSUPA use different pools of CEs (at least for Huawei)

white_Noise
2011-10-06, 05:06 AM
i don't really understand your question.

in any case, HSDPA and HSUPA use different pools of CEs (at least for Huawei)

what I meant was, in case of SRB over HSDPA, the DL CE pool usage would be zero..

boring
2011-10-06, 05:54 AM
yeap that is correct

linhhy
2011-10-06, 03:40 PM
Hi,

The diffenrent is, HSUPA require much CE for high speech dedicated channel with low SF, while HSDPA is only require CE for associated channel, means A-DCH, and R99, these channel with high SF.