How to limit HSDPA throughput in 3G?

3G / 2G
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1

Hi Experts.

Any idea how to limit HSDPA throughout in 3G?

Vendor Huawei

Main agenda is to limit the HSDPA throughput by RAN end.

Admin note: this post was updated with image below.

How to limit HSDPA throughout in 3G?
How to limit HSDPA throughout in 3G?1080×829 65.7 KB

2

Limit the Power for the HSDPA.

3

No of SF16 codes dedicated for HSDPA can be limited.

4

Better to do it from Core side.

As if you want to limit the resources from RAN side, congestion may occurred and accessibility KPIs might be affected.

5

You have to do Service differentiation based on RAB and synchronize with CN about the strategy.

QOS service differentiation.

This by defining the ARP based on user priority with differents services level and RAB priorities on CN level.

And set the same at RAN side.

Example:

How to limit HSDPA throughout in 3G?
How to limit HSDPA throughout in 3G?1080×829 65.7 KB

6

Yes thanks!

But these CN level or RNC will effect bigger area, we need to tune on smaller area to limit user.

  • Step-1 - Allocate Code Mode to Manual and Code Number for HS-PDSCH to 1, it will reduce the HS User codes and remaining all codes will be free for R99 users. It will reduce the throughput.

  • Step-2 – HS-PDSCH MPO Constant is currently set to 2.5db, if we increase the value on trial cell to 5db and 10db which will further help in reducing HSDPA user.

  • Measure Power Offset = Max(-6, Min(13,CellMaxPower - PcpichPower - Measure Power OffsetConstant))

  • Step-3 – In addition, the power allocated to HSPA must not exceed the maximum permissible power HspaPower change the power value from 0 to negative offset so that the HSPA power will be reduced.

  • Step-4 – Disabling the 16QAM and 64QAM
    //De-Activating DL 16QAM Modulation
    SET ULOCELLMACHSPARA: CME16QAMSW=CLOSE;
    //De-Activating the 64QAM Modulation
    MOD UCELLALGOSWITCH:CellId = xyz, HspaPlusSwitch=64QAM-0;

  • Step-5 – Disabing the dynamic code allocation on switch
    //Deactivating Dynamic Code Allocation Based on NodeB and dynamic code allocation optimization on NodeB
    SET ULOCELLMACHSPARA: DYNCODESW=CLOSE;

7

These actions might affect the Accessibility.

8

Summary of the Changes done

  • Step-1 - Allocate Code Mode to Manual and Code Number for HS-PDSCH to 1, it will reduce the HS User codes and remaining all codes will be free for R99 users. It will reduce the throughput.

  • Step-2 – Disabling the 16QAM and 64QAM
    //De-Activating DL 16QAM Modulation
    SET ULOCELLMACHSPARA: CME16QAMSW=CLOSE;
    De-Activating the 64QAM Modulation
    MOD UCELLALGOSWITCH:CellId = xyz, HspaPlusSwitch=64QAM-0;

  • Step-3 – Disabing the dynamic code allocation on switch
    //Deactivating Dynamic Code Allocation Based on NodeB and dynamic code allocation optimization on NodeB
    SET ULOCELLMACHSPARA: DYNCODESW=CLOSE;

These are the final actions and successfully controlled the 3G Throughput.

9

I think Step-2 – Disabling the 16QAM and 64QAM is not a smart move. You lose significant resources of the cell like this. You limit cell throughput like this instead of limiting users throughput.

I mean users should still be served with 64QAM but with a limited throughput.

You can generate congestion by Step-4 – Disabling the 16QAM and 64QAM.

10

But what are you trying to achieve?

This will destroy user experience.

Better you switch OFF the PS service.

What’s the point of using 3G under QPSK?

11

Basically it’s a very awkward settings but its proposed by Customer Sales Team to limit the 3G usage in specific cities so that they can run a heavy LTE drive campaign to enhance revenue.

Currently, we have two carriers on 3G and 7% UEs supported 3G/2G.

Now they want to do the 3G shutdown in these cities, and before doing 3G shutdown they want to make people to move on LTE.

7% users generating a very low revenue if they will move to LTE they will generate more revenue.

3G Carrier will be added to LTE.

12

Actually this will just upset customers like this and they will go to competition.

You cannot force them to upgrade their UEs to 4G capable devices.

13

Yes we proposed it.

But they have done same experiment in one city last year and it gove a good revenue boost.

Also number of 4G supportered handsets were increased with great margin.

14

Ok, understood. Strategic decision.

But the solution is very drastic.

15

I am not convinced that all users upgraded to 4G from 3G and none went to competition.

But let it be…

16

Is there 2G service in the site?

Usually 3G is kept to cater voice service for the customers whose handset don’t support LTE.

Companies normally shutdown 3G after launching LTE if site has 2G.

17

Yes, 3G or 2G is needed for 4G devices that do not support VoLTE and there is quite a number of them.

18

Yes 2G is blanket.

VoLTE supporter cheap handsets will be pushed in that areas with cheaper price.

Operational cost reduction.

19

The problem of using 2G is that there is no multi-rab.

20

Thank you all.

Yes, definitely: when there is any action there can be pros and cons.