diff --git a/config/gnbsim.yaml b/config/gnbsim.yaml
index 03dea859..2a0ffa3a 100644
--- a/config/gnbsim.yaml
+++ b/config/gnbsim.yaml
@@ -10,6 +10,7 @@ info:
   description: GNBSIM initial local configuration
 
 configuration:
+  runConfigProfilesAtStart: true
   singleInterface: false #default value
   execInParallel: false #run all profiles in parallel
   httpServer: # Serves APIs to create/control profiles on the go
diff --git a/gnbsim.go b/gnbsim.go
index 2625f768..5b23f282 100644
--- a/gnbsim.go
+++ b/gnbsim.go
@@ -113,6 +113,7 @@ func action(c *cli.Context) error {
 		// Keep running gnbsim as long as profiles are not finished
 		for _, profile := range config.Configuration.Profiles {
 			if !profile.Enable {
+				logger.AppLog.Errorln("disabled profileType ", profile.ProfileType)
 				continue
 			}
 			profileWaitGrp.Add(1)
diff --git a/gnodeb/worker/gnbcpueworker/handler.go b/gnodeb/worker/gnbcpueworker/handler.go
index 20fb6b64..2803493c 100644
--- a/gnodeb/worker/gnbcpueworker/handler.go
+++ b/gnodeb/worker/gnbcpueworker/handler.go
@@ -42,18 +42,31 @@ func HandleInitialUEMessage(gnbue *gnbctx.GnbCpUe,
 	intfcMsg common.InterfaceMessage) {
 
 	msg := intfcMsg.(*common.UuMessage)
-	sendMsg, err := test.GetInitialUEMessage(gnbue.GnbUeNgapId, msg.NasPdus[0], "")
-	if err != nil {
-		gnbue.Log.Errorln("GetInitialUEMessage failed:", err)
-		return
-	}
-	err = gnbue.Gnb.CpTransport.SendToPeer(gnbue.Amf, sendMsg)
-	if err != nil {
-		gnbue.Log.Errorln("SendToPeer failed:", err)
-		return
+	if gnbue.AmfUeNgapId != 0 {
+		sendMsg, err := test.GetUplinkNASTransport(gnbue.AmfUeNgapId, gnbue.GnbUeNgapId, msg.NasPdus[0])
+		if err != nil {
+			gnbue.Log.Errorln("GetUplinkNASMessage failed:", err)
+			return
+		}
+		err = gnbue.Gnb.CpTransport.SendToPeer(gnbue.Amf, sendMsg)
+		if err != nil {
+			gnbue.Log.Errorln("SendToPeer failed:", err)
+			return
+		}
+		gnbue.Log.Traceln("Sent Uplink NAS Message to AMF")
+	} else {
+		sendMsg, err := test.GetInitialUEMessage(gnbue.GnbUeNgapId, msg.NasPdus[0], "")
+		if err != nil {
+			gnbue.Log.Errorln("GetInitialUEMessage failed:", err)
+			return
+		}
+		err = gnbue.Gnb.CpTransport.SendToPeer(gnbue.Amf, sendMsg)
+		if err != nil {
+			gnbue.Log.Errorln("SendToPeer failed:", err)
+			return
+		}
+		gnbue.Log.Traceln("Sent Initial UE Message to AMF")
 	}
-
-	gnbue.Log.Traceln("Sent Initial UE Message to AMF")
 }
 
 func HandleDownlinkNasTransport(gnbue *gnbctx.GnbCpUe,
diff --git a/profile/context/profile.go b/profile/context/profile.go
index e1e58c96..e3d49f4d 100644
--- a/profile/context/profile.go
+++ b/profile/context/profile.go
@@ -120,7 +120,7 @@ func (profile *Profile) Init() {
 func SendStepEventProfile(name string) error {
 	profile, found := ProfileMap[name]
 	if found == false {
-		err := fmt.Errorf("unknown profile:%v", profile)
+		err := fmt.Errorf("unknown profile:%s", name)
 		log.Println(err)
 		return err
 	}
@@ -144,7 +144,7 @@ func SendStepEventProfile(name string) error {
 func SendAddNewCallsEventProfile(name string, number int32) error {
 	profile, found := ProfileMap[name]
 	if found == false {
-		err := fmt.Errorf("unknown profile:%v", profile)
+		err := fmt.Errorf("unknown profile:%s", name)
 		return err
 	}
 	msg := &common.ProfileMessage{}
@@ -237,7 +237,7 @@ func (p *Profile) GetNextProcedure(pCtx *ProfileUeContext, currentProcedure comm
 		itp, _ := p.PIterations[pCtx.CurrentItr]
 		pCtx.Log.Infoln("Current Iteration map - ", itp)
 		if itp.WaitMap[pCtx.CurrentProcIndex] != 0 {
-			time.Sleep(time.Second * time.Duration(itp.WaitMap[pCtx.CurrentProcIndex]))
+			time.Sleep(time.Millisecond * time.Duration(itp.WaitMap[pCtx.CurrentProcIndex]))
 		}
 		nextProcIndex := pCtx.CurrentProcIndex + 1
 		nextProcedure, found := itp.ProcMap[nextProcIndex]
diff --git a/realue/nas/build.go b/realue/nas/build.go
index 231ba4f2..a2462f9a 100644
--- a/realue/nas/build.go
+++ b/realue/nas/build.go
@@ -30,7 +30,7 @@ func GetServiceRequest(ue *realuectx.RealUe) ([]byte, error) {
 	data := new(bytes.Buffer)
 	err := nasMsg.GmmMessageEncode(data)
 	if err != nil {
-		return nil, fmt.Errorf("encode failed: %v\n", err)
+		return nil, fmt.Errorf("encode failed:+%v", err)
 	}
 
 	return data.Bytes(), nil
diff --git a/realue/nas/nas_security.go b/realue/nas/nas_security.go
index 324befee..b6e0ecae 100644
--- a/realue/nas/nas_security.go
+++ b/realue/nas/nas_security.go
@@ -8,6 +8,7 @@ package nas
 import (
 	"fmt"
 	"reflect"
+	"sync"
 
 	realuectx "github.com/omec-project/gnbsim/realue/context"
 
@@ -17,6 +18,9 @@ import (
 	"github.com/omec-project/ngap/ngapType"
 )
 
+var decodeMutex sync.Mutex
+var encodeMutex sync.Mutex
+
 func EncodeNasPduWithSecurity(ue *realuectx.RealUe, pdu []byte, securityHeaderType uint8,
 	securityContextAvailable bool) ([]byte, error) {
 	m := nas.NewMessage()
@@ -68,6 +72,8 @@ func GetNasPduSetupRequest(ue *realuectx.RealUe, msg *ngapType.PDUSessionResourc
 
 func NASEncode(ue *realuectx.RealUe, msg *nas.Message, securityContextAvailable bool) (
 	payload []byte, err error) {
+	encodeMutex.Lock()
+	defer encodeMutex.Unlock()
 
 	if ue == nil {
 		err = fmt.Errorf("amfUe is nil")
@@ -137,6 +143,9 @@ func NASEncode(ue *realuectx.RealUe, msg *nas.Message, securityContextAvailable
 }
 
 func NASDecode(ue *realuectx.RealUe, securityHeaderType uint8, payload []byte) (msg *nas.Message, err error) {
+	decodeMutex.Lock()
+	defer decodeMutex.Unlock()
+
 	if ue == nil {
 		err = fmt.Errorf("amfUe is nil")
 		return