Regarding S1 interface and bandwidth(bwp)

[satya singh]

Please someone explain me this thing-

1.How a gnb is configured to communicate with mme or sgw , is it configured when we pass epchelper object to nrhelper and then call for installGNbDevice ?

2. Whatever the bandwidth we declare in our simulation , when a gnb gets attached to the core , the whole bandwidth is available for them only individually or configure multiple type of ue , or can be utilized by each and every gnb whether connected or not ?

Ptr<NrHelper> nrHelper4f = CreateObject<NrHelper>();

Ptr<NrPointToPointEpcHelper> epcHelper = CreateObject<NrPointToPointEpcHelper>();

nrHelper4f->SetEpcHelper(epcHelper);

NetDeviceContainer fronthaulEnbNetDev =

nrHelper4f->InstallGnbDevice(backhaulGnbContainer, allBwps);

[satya singh]

Actually i have configured 2 type of gnb  for different purpose (backhaul and fronthaul) ,  and i only want communication between one type of gnb with core . 

[George Frangulea]

I suggest you look at existing info such as:
 The NR tutorial: https://cttc-lena.gitlab.io/nr/cttc-nr-demo-tutorial.pdf

Also, you must refine your questions more. What do you mean by " the whole bandwidth is available for them only individually or configure multiple type of ue" ? The gNB available bandwidth is the one you set for allBwps and pass when you call InstallGnbDevice. 
I recommend enabling LOGs or adding your own to understand better what happens when you compile. 

[satya singh]

Thank you George for your response , now i understand about bandwidth related question , there is one more question , can we configure standalone scenario using nr module like we normally do in ns3 , is it necessary to have core and remotehost in simulation.