private void EndSession(ISession session, DateTime end, IRat rat)
{
if (session == null)
{
throw new VerticalHandoverPredictionException($"{nameof(session)} is null");
}
if (rat == null)
{
throw new VerticalHandoverPredictionException($"{nameof(rat)} is null");
}
rat.RemoveSession(session);
session.SetEndTime(end);
SessionId = Guid.Empty;
var callLog = new CallLog
{
UserId = MobileTerminalId,
SessionId = session.SessionId,
StartTime = session.Start,
Duration = session.End.Subtract(session.Start),
SessionSequence = String.Join("", session.SessionSequence.Select(x => (int)x))
};
IsActive = false;
AddCallLog(callLog);
//if (Simulator.NetworkSimulator.Instance.SaveCallLogs)
//Utils.CsvUtils._Instance.Write<CallLogMap, CallLog>(callLog, $"{Environment.CurrentDirectory}/calllogs.csv");
HetNet.Instance.TotalSessions++;
}
private void StartNewSessionAndAdmitCall(CallStartedEvent evt, IMobileTerminal mobileTerminal, IRat rat)
{
var session = new Session(rat.RatId, evt.Time);
mobileTerminal.SetSessionId(session.SessionId);
rat.TakeNetworkResources(evt.Call.Service.ComputeRequiredNetworkResources());
session.AddToActiveCalls(evt.Call);
var state = mobileTerminal.UpdateMobileTerminalState(session);
session.AddToSessionSequence(state);
rat.AddSession(session);
}
public void Handover(ICall call, ISession session, IMobileTerminal mobileTerminal, IRat source)
{
if (call == null)
{
throw new VerticalHandoverPredictionException($"{nameof(call)} is invalid");
}
if (session == null)
{
throw new VerticalHandoverPredictionException($"{nameof(session)} is invalid");
}
if (mobileTerminal == null)
{
throw new VerticalHandoverPredictionException($"{nameof(mobileTerminal)} is invalid");
}
if (source == null)
{
throw new VerticalHandoverPredictionException($"{nameof(source)} is invalid");
}
var callsToHandedOverToTargetRat = session.ActiveCalls.Select(x => x.Service).ToList();
callsToHandedOverToTargetRat.Add(call.Service);
var rats = Rats
.Where(x => x.RatId != session.RatId &&
x.Services.ToHashSet().IsSupersetOf(callsToHandedOverToTargetRat))
.OrderBy(x => x.Services.Count())
.ToList();
var requiredNetworkResouces = 0;
foreach (var service in callsToHandedOverToTargetRat)
{
requiredNetworkResouces += service.ComputeRequiredNetworkResources();
}
foreach (var target in rats)
{
if (requiredNetworkResouces <= target.AvailableNetworkResources())
{
UpdateHandovers(call.Service);
source.RealeaseNetworkResources(requiredNetworkResouces - call.Service.ComputeRequiredNetworkResources());
source.RemoveSession(session);
session.SetRatId(target.RatId);
target.TakeNetworkResources(requiredNetworkResouces);
session.AddToActiveCalls(call);
var state = mobileTerminal.UpdateMobileTerminalState(session);
session.AddToSessionSequence(state);
target.AddSession(session);
return;
}
}
//If call cannot be handed over then the incoming call is blocked
BlockedCalls++;
}