How do i get RSRP value from UE to measure signal of eNB(s)

[陳文聰]

Hello everybody,

i have a set of UE(s) and a set of eNB(s)

i want to measure each UE received signal or RSRP from eNB for choosing to attach the strongest cell of eNB manually!

can anyone help me in this problems!

thanks!!!

[Mehdi]

Hello,
I have some indications that are probably not the best way to do it, but it is better than nothing.
I assume you are not a beginner.

To retrieve the RSRP:

Config::Connect ("/NodeList/*/DeviceList/0/LteUePhy/ReportUeMeasurements", MakeBoundCallback (&ReportUeMeasurementsCallback, this));
void ReportUeMeasurementsCallback (LteUeMeasurementsTestCase *testcase, std::string path,
                             uint16_t rnti, uint16_t cellId, double rsrp, double rsrq, bool servingCell)
{
   // called each time an UE receives a measurement
}

You can use this function to store the RSRP regarding each UE over time.
Then you can write a function GetStrongestCell(...) that returns the ID of the cell that has the strongest signal
Then you add a periodic function HandoverToStrongest(...) that forces the handover:

void DoHandoverRequest (Ptr<NetDevice> ueDev, Ptr<NetDevice> sourceEnbDev, Ptr<NetDevice> targetEnbDev)
{
  uint16_t targetCellId = targetEnbDev->GetObject<LteEnbNetDevice> ()->GetCellId ();
  Ptr<LteEnbRrc> sourceRrc = sourceEnbDev->GetObject<LteEnbNetDevice> ()->GetRrc ();
  uint16_t rnti = ueDev->GetObject<LteUeNetDevice> ()->GetRrc ()->GetRnti ();
  sourceRrc->SendHandoverRequest (rnti, targetCellId); 
}

void HandoverToStrongest(NetDeviceContainer enbLteDevs, NetDeviceContainer ueLteDevs) {
   
    for(uint32_t u = 0 ; u < ueLteDevs.GetN() ; u++) { //for each UE
        uint16_t attachedCellId = ueLteDevs.Get(u)->GetObject<LteUeNetDevice>()->GetRrc()->GetCellId();
        uint16_t strongestCellId = GetStrongestCell(...);
       
        if (attachedCellId != strongestCellId) {
            DoHandoverRequest( ueLteDevs.Get(u), enbLteDevs.Get (attachedCellId-1), enbLteDevs.Get (strongestCellId-1) );
        }
    }

    Simulator::Schedule(Seconds(HANDOVER_FORCING_PERIOD), &HandoverToStrongest, enbLteDevs, ueLteDevs);
}

This is really a dirty solution but it should work.

[Mehdi]

Well it is pretty simple, the RSRP is contained in the rsrp variable !
If you have trouble with ns3 and c++, you will have difficulties to implement this solution...

[Umair Masood]

You can use traces to get the trace file. Please study this documentation http://www.nsnam.org/docs/models/html/lte-user.html... While you can measure only the rsrp values for the serving cells . If you want to get for the neighboring cells you have to check Lte-enb-rrc file. and using traces to get back the value.

[陳文聰]

can u please tell how should i do in here for getting rsrp

i am poor in ns3 and c++

thanks~!!

void ReportUeMeasurementsCallback (LteUeMeasurementsTestCase *testcase, std::string path,
                             uint16_t rnti, uint16_t cellId, double rsrp, double rsrq, bool servingCell)
{
   // called each time an UE receives a measurement
}

陳文聰於 2013年12月4日星期三UTC+8下午5時14分00秒寫道：

[el jari ouarda]

Hello everybody,

pleasee,i have in my simulation 3 users and 8 small cells and 2 enodeB , i want to measure the received sinr from eNB at each position of user( the users are mobiles),to get the id of the cells in a liste then chose manually the attachement of the users!!!!!!!!!
can anyone help me :!!!
thanks