LTE LENA questions: how to set the rate for an EPS bearer (GBR or NGBR)

[Dapeng Liu]

Hi,

Thanks for answering my questions below.

In the LTE LENA user documentation, it mentions
      
     Activate an EPS Bearer including the setup of the Radio Bearer between an eNB and its attached UE:

1. enum EpsBearer::Qci q = EpsBearer::GBR_CONV_VOICE;
   EpsBearer bearer (q);
   lteHelper->ActivateEpsBearer (ueDevs, bearer);
   

   In the current version of the ns-3 LTE model, the activation of an EPS Bearer will also activate two saturation traffic generators for that bearer, one in uplink and one in downlink.

1. How does the saturation traffic generator work? How do we set the rate for an EPS bearer instead of the saturation?
2. Would lteHelper->ActivateEpsBearer (ueDevs, bearer, EpcTft::Default ()); activate all UEs defined within ueDevs to the same bearer bearer? That does not make sense to me. Each UE has its own bearers.


Thanks a lot for your time,
--
Dapeng

[Arne Lie]

Hi Dapeng,

 

I guess, the "saturation traffic generators" refer to the RLC/SM mode, i.e., the "Saturation Mode" that I think is used when you do not activate the EPC system in LENA. From my understanding, this means that the RLC layer will see a continuous traffic demand from above layers, whenever there is an opportunity to submit new packets. I agree with you that there must be one EPS bearer per UE.

 

best regards

Arne Lie

SINTEF

2012/4/29 Dapeng Liu <auror...@gmail.com>

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[Nicola Baldo]

Hi Dapeng,

On Apr 29, 9:36 pm, Dapeng Liu <auroral1...@gmail.com> wrote:
>
> 1. How does the saturation traffic generator work? How do we set the rate
> for an EPS bearer instead of the saturation?

to use a model other than saturation, you need to use the EPC model
together with some Application. Please see the LENA documentation
about how to do this.


> 2. Would *lteHelper->ActivateEpsBearer (ueDevs, bearer, EpcTft::Default ());
> * activate all UEs defined within *ueDevs* to the same bearer *bearer*?

> That does not make sense to me. Each UE has its own bearers.

bearers are always separate. The above method just creates separate
bearers that all have the same configuration.

Regards,

Nicola