Decode pcap and make a MSC with AI
What's better than creating an easy Message Sequence Chart (MSC) from a PCAP trace? Doing that and analyzing it with AI (Artificial Intelligence)!
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AA [label="UE"], # ip = 37.50.128.74
AB [label="DNS1"], # ip = 193.254.163.193
AC [label="DNS2"], # ip = 193.254.163.201
AD [label="eNodeB"], # ip = 10.108.235.36
AE [label="MME"], # ip = 10.108.240.42
AF [label="SGW"], # ip = 10.108.240.60
AG [label="PGW"], # ip = 10.108.23.67
AH [label="HSS"], # ip = 10.108.240.41
AI [label="PCRF"], # ip = 10.102.197.218
AJ [label="Charging"], # ip = 10.23.22.85
AK [label="UDR"], # ip = 10.108.235.34
AL [label="NRF"], # ip = 10.102.197.210
AM [label="Application Server"]; # ip = 172.21.143.27
# messages flow
AA => AB [label="[dns] Standard query \n A dns21.mnc001.mcc262.gprs", linecolor="darkblue", textcolor="darkblue"]; #
AA => AC [label="[dns] Standard query \n A dns21.mnc001.mcc262.gprs", linecolor="darkblue", textcolor="darkblue"]; #
AC => AA [label="[dns] Standard query response \n No such name", linecolor="darkblue", textcolor="darkblue"]; #
AB => AA [label="[dns] Standard query response \n No such name", linecolor="darkblue", textcolor="darkblue"]; #
AD => AE [label="[s1ap] (2)InitialUEMessage, Attach request,\n PDN connectivity request", linecolor="magenta", textcolor="magenta"]; #
AE => AD [label="[sctp] SACK (Ack=0)", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] DownlinkNASTransport, Identity request", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=0)", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] DownlinkNASTransport, Identity request", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=1)", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] DownlinkNASTransport, Identity request", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=2)", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] DownlinkNASTransport, Identity request", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=3)", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] DownlinkNASTransport, Identity request", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=4)", linecolor="gray", textcolor="gray"]; #
AD => AE [label="[s1ap] InitialUEMessage, Attach request, PDN connectivity request", linecolor="magenta", textcolor="magenta"]; #
AE => AD [label="[sctp] SACK (Ack=1)", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] DownlinkNASTransport, Identity request", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=5)", linecolor="gray", textcolor="gray"]; #
AD => AE [label="[s1ap] UplinkNASTransport, Identity response", linecolor="magenta", textcolor="magenta"]; #
AE => AD [label="[sctp] SACK (Ack=2)", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] DownlinkNASTransport, Authentication request", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=6)", linecolor="gray", textcolor="gray"]; #
AD => AE [label="[s1ap] UplinkNASTransport, Authentication response", linecolor="magenta", textcolor="magenta"]; #
AE => AD [label="[sctp] SACK (Ack=3)", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] DownlinkNASTransport, Security mode command", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=7)", linecolor="gray", textcolor="gray"]; #
AD => AE [label="[s1ap] UplinkNASTransport, Ciphered message", linecolor="magenta", textcolor="magenta"]; #
AA => AF [label="[gtpv2] Create Session Request", linecolor="cyan", textcolor="cyan"]; #
AF => AA [label="[gtpv2] Create Session Response", linecolor="cyan", textcolor="cyan"]; #
AE => AD [label="[sctp] SACK (Ack=4)", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] DownlinkNASTransport, Ciphered message", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=8)", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] DownlinkNASTransport, Attach reject (Protocol error, unspecified)", linecolor="magenta", textcolor="magenta"]; #
AE => AD [label="[s1ap] UEContextReleaseCommand [NAS-cause=normal-release]", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=10)", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] DownlinkNASTransport, Ciphered message", linecolor="magenta", textcolor="magenta"]; #
AG => AH [label="[s1ap] ENBConfigurationTransfer", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=11)", linecolor="gray", textcolor="gray"]; #
AH => AG [label="[sctp] SACK (Ack=0)", linecolor="gray", textcolor="gray"]; #
AA => AB [label="[dns] Standard query \n A dns21.mnc001.mcc262.gprs", linecolor="darkblue", textcolor="darkblue"]; #
AA => AC [label="[dns] Standard query \n A dns21.mnc001.mcc262.gprs", linecolor="darkblue", textcolor="darkblue"]; #
AB => AA [label="[dns] Standard query response \n No such name", linecolor="darkblue", textcolor="darkblue"]; #
AC => AA [label="[dns] Standard query response \n No such name", linecolor="darkblue", textcolor="darkblue"]; #
AD => AE [label="[s1ap] UEContextReleaseComplete", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] DATA (TSN=5) (retransmission)", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[sctp] SACK (Ack=5)", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] DownlinkNASTransport, Ciphered message", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=12 )", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] DownlinkNASTransport", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=13 )", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] DownlinkNASTransport, Ciphered message", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=14 )", linecolor="gray", textcolor="gray"]; #
AD => AE [label="[s1ap] UplinkNASTransport, Ciphered message", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] DATA (TSN=6) (retransmission)", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[sctp] SACK (Ack=6 )", linecolor="gray", textcolor="gray"]; #
AD => AE [label="[s1ap] UplinkNASTransport, Ciphered message", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[s1ap] UplinkNASTransport, Ciphered message", linecolor="magenta", textcolor="magenta"]; #
AE => AD [label="[sctp] SACK (Ack=8, Arwnd=77756)", linecolor="gray", textcolor="gray"]; #
AA => AC [label="[dns] Standard query \n A dns21.mnc001.mcc262.gprs", linecolor="darkblue", textcolor="darkblue"]; #
AA => AB [label="[dns] Standard query \n A dns21.mnc001.mcc262.gprs", linecolor="darkblue", textcolor="darkblue"]; #
AC => AA [label="[dns] Standard query response \n No such name", linecolor="darkblue", textcolor="darkblue"]; #
AB => AA [label="[dns] Standard query response \n No such name", linecolor="darkblue", textcolor="darkblue"]; #
AD => AE [label="[s1ap] UEContextReleaseRequest [RadioNetwork-cause=user-inactivity]", linecolor="magenta", textcolor="magenta"]; #
AA => AF [label="[gtpv2] Release Access Bearers Request", linecolor="cyan", textcolor="cyan"]; #
AF => AA [label="[gtpv2] Release Access Bearers Response", linecolor="cyan", textcolor="cyan"]; #
AE => AD [label="[sctp] SACK (Ack=9 )", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] UEContextReleaseCommand [RadioNetwork-cause=user-inactivity]", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=15 )", linecolor="gray", textcolor="gray"]; #
AD => AE [label="[s1ap] UEContextReleaseComplete", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] DATA (TSN=10) (retransmission)", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[sctp] SACK (Ack=10 )", linecolor="gray", textcolor="gray"]; #
AD => AE [label="[s1ap] InitialUEMessage, Tracking area update request", linecolor="magenta", textcolor="magenta"]; #
AA => AF [label="[gtpv2] Modify Bearer Request", linecolor="cyan", textcolor="cyan"]; #
AF => AA [label="[gtpv2] Modify Bearer Response", linecolor="cyan", textcolor="cyan"]; #
AE => AD [label="[sctp] SACK (Ack=11 )", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] DownlinkNASTransport, Ciphered message", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=16 )", linecolor="gray", textcolor="gray"]; #
AD => AE [label="[s1ap] UplinkNASTransport, Ciphered message", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] DATA (TSN=12) (retransmission)", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[sctp] SACK (Ack=12 )", linecolor="gray", textcolor="gray"]; #
AD => AE [label="[s1ap] InitialUEMessage, Control plane service request", linecolor="magenta", textcolor="magenta"]; #
AE => AD [label="[sctp] SACK (Ack=13 )", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] ConnectionEstablishmentIndication", linecolor="magenta", textcolor="magenta"]; #
AA => AF [label="[gtpv2] Modify Bearer Request", linecolor="cyan", textcolor="cyan"]; #
AF => AA [label="[gtpv2] Modify Bearer Response", linecolor="cyan", textcolor="cyan"]; #
AE => AD [label="[s1ap] DownlinkNASTransport, Ciphered message", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=18 )", linecolor="gray", textcolor="gray"]; #
AI => AJ [label="[coap] CON, MID:16839, POST", linecolor="lime", textcolor="lime"]; #
AI => AJ [label="[coap] CON, MID:16839, POST", linecolor="lime", textcolor="lime"]; #
AI => AJ [label="[coap] CON, MID:16839, POST", linecolor="lime", textcolor="lime"]; #
AJ => AI [label="[coap] CON, MID:16839, POST", linecolor="lime", textcolor="lime"]; #
AJ => AI [label="[coap] CON, MID:16839, POST", linecolor="lime", textcolor="lime"]; #
AJ => AI [label="[coap] CON, MID:16839, POST", linecolor="lime", textcolor="lime"]; #
AE => AD [label="[s1ap] DownlinkNASTransport, Ciphered message", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=19 )", linecolor="gray", textcolor="gray"]; #
AG => AH [label="[s1ap] ENBConfigurationTransfer", linecolor="magenta", textcolor="magenta"]; #
AH => AG [label="[sctp] SACK (Ack=1 )", linecolor="gray", textcolor="gray"]; #
AD => AE [label="[s1ap] UEContextReleaseRequest [RadioNetwork-cause=user-inactivity]", linecolor="magenta", textcolor="magenta"]; #
AA => AF [label="[gtpv2] Release Access Bearers Request", linecolor="cyan", textcolor="cyan"]; #
AF => AA [label="[gtpv2] Release Access Bearers Response", linecolor="cyan", textcolor="cyan"]; #
AE => AD [label="[sctp] SACK (Ack=14 )", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] UEContextReleaseCommand [RadioNetwork-cause=user-inactivity]", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=20 )", linecolor="gray", textcolor="gray"]; #
AD => AE [label="[s1ap] UEContextReleaseComplete", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] DATA (TSN=15) (retransmission)", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[sctp] SACK (Ack=15 )", linecolor="gray", textcolor="gray"]; #
AA => AB [label="[dns] Standard query \n A dns21.mnc001.mcc262.gprs", linecolor="darkblue", textcolor="darkblue"]; #
AA => AB [label="[dns] Standard query \n A dns21.mnc001.mcc262.gprs", linecolor="darkblue", textcolor="darkblue"]; #
AB => AA [label="[dns] Standard query response \n No such name", linecolor="darkblue", textcolor="darkblue"]; #
AC => AA [label="[dns] Standard query response \n No such name", linecolor="darkblue", textcolor="darkblue"]; #
AD => AE [label="[s1ap] UEContextReleaseRequest [RadioNetwork-cause=user-inactivity]", linecolor="magenta", textcolor="magenta"]; #
AA => AF [label="[gtpv2] Release Access Bearers Request", linecolor="cyan", textcolor="cyan"]; #
AF => AA [label="[gtpv2] Release Access Bearers Response", linecolor="cyan", textcolor="cyan"]; #
AE => AD [label="[sctp] SACK (Ack=16 )", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] UEContextReleaseCommand [RadioNetwork-cause=user-inactivity]", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=21 )", linecolor="gray", textcolor="gray"]; #
AD => AE [label="[s1ap] UEContextReleaseComplete", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] DATA (TSN=17) (retransmission)", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[sctp] SACK (Ack=17 )", linecolor="gray", textcolor="gray"]; #
AA => AF [label="[gtpv2] Echo Request", linecolor="cyan", textcolor="cyan"]; #
AF => AA [label="[gtpv2] Echo Response", linecolor="cyan", textcolor="cyan"]; #
AG => AH [label="[s1ap] ENBConfigurationTransfer", linecolor="magenta", textcolor="magenta"]; #
AH => AG [label="[sctp] SACK (Ack=2 )", linecolor="gray", textcolor="gray"]; #
AA => AC [label="[dns] Standard query \n A dns21.mnc001.mcc262.gprs", linecolor="darkblue", textcolor="darkblue"]; #
AA => AB [label="[dns] Standard query \n A dns21.mnc001.mcc262.gprs", linecolor="darkblue", textcolor="darkblue"]; #
AC => AA [label="[dns] Standard query response \n No such name", linecolor="darkblue", textcolor="darkblue"]; #
AB => AA [label="[dns] Standard query response \n No such name", linecolor="darkblue", textcolor="darkblue"]; #
AD => AE [label="[s1ap] InitialUEMessage, Control plane service request", linecolor="magenta", textcolor="magenta"]; #
AE => AD [label="[sctp] SACK (Ack=18 )", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] ConnectionEstablishmentIndication", linecolor="magenta", textcolor="magenta"]; #
AA => AF [label="[gtpv2] Modify Bearer Request", linecolor="cyan", textcolor="cyan"]; #
AF => AA [label="[gtpv2] Modify Bearer Response", linecolor="cyan", textcolor="cyan"]; #
AE => AD [label="[s1ap] DownlinkNASTransport", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=23 )", linecolor="gray", textcolor="gray"]; #
AI => AJ [label="[coap] CON, MID:16839, POST", linecolor="lime", textcolor="lime"]; #
AI => AJ [label="[coap] CON, MID:16839, POST", linecolor="lime", textcolor="lime"]; #
AI => AJ [label="[coap] CON, MID:16839, POST", linecolor="lime", textcolor="lime"]; #
AJ => AI [label="[coap] CON, MID:16839, POST", linecolor="lime", textcolor="lime"]; #
AJ => AI [label="[coap] CON, MID:16839, POST", linecolor="lime", textcolor="lime"]; #
AJ => AI [label="[coap] CON, MID:16839, POST", linecolor="lime", textcolor="lime"]; #
AE => AD [label="[s1ap] DownlinkNASTransport, Ciphered message", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=24 )", linecolor="gray", textcolor="gray"]; #
AD => AE [label="[s1ap] UEContextReleaseRequest [RadioNetwork-cause=user-inactivity]", linecolor="magenta", textcolor="magenta"]; #
AA => AF [label="[gtpv2] Release Access Bearers Request", linecolor="cyan", textcolor="cyan"]; #
AF => AA [label="[gtpv2] Release Access Bearers Response", linecolor="cyan", textcolor="cyan"]; #
AE => AD [label="[sctp] SACK (Ack=19 )", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] UEContextReleaseCommand [RadioNetwork-cause=user-inactivity]", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=25 )", linecolor="gray", textcolor="gray"]; #
AD => AE [label="[s1ap] UEContextReleaseComplete", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] DATA (TSN=20) (retransmission)", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[sctp] SACK (Ack=20 )", linecolor="gray", textcolor="gray"]; #
AD => AE [label="[s1ap] InitialUEMessage, Detach request (EPS detach)", linecolor="magenta", textcolor="magenta"]; #
AA => AF [label="[gtpv2] Delete Session Request", linecolor="cyan", textcolor="cyan"]; #
AF => AA [label="[gtpv2] Delete Session Response", linecolor="cyan", textcolor="cyan"]; #
AE => AD [label="[sctp] SACK (Ack=21 )", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[s1ap] DownlinkNASTransport, Ciphered message", linecolor="magenta", textcolor="magenta"]; #
AE => AD [label="[s1ap] UEContextReleaseCommand [NAS-cause=detach]", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] SACK (Ack=27 )", linecolor="gray", textcolor="gray"]; #
AD => AE [label="[s1ap] UEContextReleaseComplete", linecolor="magenta", textcolor="magenta"]; #
AD => AE [label="[sctp] DATA (TSN=22) (retransmission)", linecolor="gray", textcolor="gray"]; #
AE => AD [label="[sctp] SACK (Ack=22 )", linecolor="gray", textcolor="gray"]; #
AG => AH [label="[s1ap] ENBConfigurationTransfer", linecolor="magenta", textcolor="magenta"]; #
AH => AG [label="[sctp] SACK (Ack=3 )", linecolor="gray", textcolor="gray"]; #
AK => AE [label="[s1ap] InitialUEMessage, Control plane service request", linecolor="magenta", textcolor="magenta"]; #
AE => AK [label="[sctp] SACK (Ack=0 )", linecolor="gray", textcolor="gray"]; #
AE => AK [label="[s1ap] ConnectionEstablishmentIndication", linecolor="magenta", textcolor="magenta"]; #
AA => AF [label="[gtpv2] Modify Bearer Request", linecolor="cyan", textcolor="cyan"]; #
AF => AA [label="[gtpv2] Modify Bearer Response", linecolor="cyan", textcolor="cyan"]; #
AE => AK [label="[s1ap] DownlinkNASTransport, Ciphered message", linecolor="magenta", textcolor="magenta"]; #
AK => AE [label="[sctp] SACK (Ack=1 )", linecolor="gray", textcolor="gray"]; #
AL => AJ [label="[coap] CON, MID:16839, POST, End of Block #1052", linecolor="lime", textcolor="lime"]; #
AL => AJ [label="[coap] CON, MID:16839, POST, End of Block #1052", linecolor="lime", textcolor="lime"]; #
AL => AJ [label="[coap] CON, MID:16839, POST, End of Block #1052", linecolor="lime", textcolor="lime"]; #
AJ => AL [label="[coap] CON, MID:16839, POST, End of Block #1052", linecolor="lime", textcolor="lime"]; #
AJ => AL [label="[coap] CON, MID:16839, POST, End of Block #1052", linecolor="lime", textcolor="lime"]; #
AJ => AL [label="[coap] CON, MID:16839, POST, End of Block #1052", linecolor="lime", textcolor="lime"]; #
AE => AK [label="[s1ap] DownlinkNASTransport, Ciphered message", linecolor="magenta", textcolor="magenta"]; #
AK => AE [label="[sctp] SACK (Ack=2 )", linecolor="gray", textcolor="gray"]; #
AK => AE [label="[s1ap] UplinkNASTransport, Ciphered message", linecolor="magenta", textcolor="magenta"]; #
AL => AM [label="[data] 49153 → 5686 Len=300"]; #
AK => AE [label="[sctp] DATA (TSN=1) (retransmission)", linecolor="gray", textcolor="gray"]; #
AE => AK [label="[sctp] SACK (Ack=1 )", linecolor="gray", textcolor="gray"]; #
AK => AE [label="[s1ap] UplinkNASTransport, Ciphered message", linecolor="magenta", textcolor="magenta"]; #
AL => AJ [label="[coap] CON, MID:16839, POST, End of Block #1052", linecolor="lime", textcolor="lime"]; #
AL => AJ [label="[coap] CON, MID:16839, POST, End of Block #1052", linecolor="lime", textcolor="lime"]; #
AL => AJ [label="[coap] CON, MID:16839, POST, End of Block #1052", linecolor="lime", textcolor="lime"]; #
AJ => AL [label="[coap] CON, MID:16839, POST, End of Block #1052", linecolor="lime", textcolor="lime"]; #
AJ => AL [label="[coap] CON, MID:16839, POST, End of Block #1052", linecolor="lime", textcolor="lime"]; #
AJ => AL [label="[coap] CON, MID:16839, POST, End of Block #1052", linecolor="lime", textcolor="lime"]; #
AE => AK [label="[sctp] SACK (Ack=2 )", linecolor="gray", textcolor="gray"]; #
AE => AK [label="[s1ap] DownlinkNASTransport, Ciphered message", linecolor="magenta", textcolor="magenta"]; #
AK => AE [label="[sctp] SACK (Ack=3 )", linecolor="gray", textcolor="gray"]; #
AA => AC [label="[dns] Standard query \n A dns21.mnc001.mcc262.gprs", linecolor="darkblue", textcolor="darkblue"]; #
AA => AB [label="[dns] Standard query \n A dns21.mnc001.mcc262.gprs", linecolor="darkblue", textcolor="darkblue"]; #
AC => AA [label="[dns] Standard query response \n No such name", linecolor="darkblue", textcolor="darkblue"]; #
AB => AA [label="[dns] Standard query response \n No such name", linecolor="darkblue", textcolor="darkblue"]; #
AK => AE [label="[s1ap] UEContextReleaseRequest [RadioNetwork-cause=user-inactivity]", linecolor="magenta", textcolor="magenta"]; #
AA => AF [label="[gtpv2] Release Access Bearers Request", linecolor="cyan", textcolor="cyan"]; #
AF => AA [label="[gtpv2] Release Access Bearers Response", linecolor="cyan", textcolor="cyan"]; #
AE => AK [label="[sctp] SACK (Ack=3 )", linecolor="gray", textcolor="gray"]; #
AE => AK [label="[s1ap] UEContextReleaseCommand [RadioNetwork-cause=user-inactivity]", linecolor="magenta", textcolor="magenta"]; #
AK => AE [label="[sctp] SACK (Ack=4 )", linecolor="gray", textcolor="gray"]; #
AK => AE [label="[s1ap] UEContextReleaseComplete", linecolor="magenta", textcolor="magenta"]; #
AK => AE [label="[sctp] DATA (TSN=4) (retransmission)", linecolor="gray", textcolor="gray"]; #
AE => AK [label="[sctp] SACK (Ack=4 )", linecolor="gray", textcolor="gray"]; #
AA => AC [label="[dns] Standard query \n A dns21.mnc001.mcc262.gprs", linecolor="darkblue", textcolor="darkblue"]; #
AA => AB [label="[dns] Standard query \n A dns21.mnc001.mcc262.gprs", linecolor="darkblue", textcolor="darkblue"]; #
AC => AA [label="[dns] Standard query response \n No such name", linecolor="darkblue", textcolor="darkblue"]; #
AB => AA [label="[dns] Standard query response \n No such name", linecolor="darkblue", textcolor="darkblue"]; #
AA => AF [label="[gtpv2] Echo Request", linecolor="cyan", textcolor="cyan"]; #
AF => AA [label="[gtpv2] Echo Response", linecolor="cyan", textcolor="cyan"]; #
}Summary of the Message Flow
The message flow represented in the MSC (Message Sequence Chart) consists of multiple signaling communications primarily focusing on the GTPv2 (GPRS Tunneling Protocol), S1 Application Protocol (S1AP), SCTP (Stream Control Transmission Protocol), and CoAP (Constrained Application Protocol).
-
GTPv2 Messages:
- Modify Bearer Response: The process begins with a Modify Bearer Response from AF (Access Function) to AA (the entity managing sessions).
- Subsequent requests and responses between these entities, including an Echo Request and Response.
-
S1AP Messages:
- Multiple exchanges related to Downlink and Uplink NASTransport messages are observed, indicating the transfer of encrypted user data across the S1 interface.
- Release requests and commands suggest a context release procedure due to user inactivity.
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CoAP Messages:
- A series of consecutive CON messages are exchanged between AL and AJ, indicating a Block-wise transfer of data via the CoAP protocol.
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DNS Messages:
- DNS queries are made by AA, with responses indicating "no such name," suggesting potential issues with domain resolution for the specified DNS records.
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SCTP Messages:
- SACK messages are sent back and forth to acknowledge the successful receipt of data packets, implying flow control mechanisms are being implemented.
Potential Issues
- The repeated DNS queries with responses indicating "No Such Name" should be investigated, as they indicate that the network cannot resolve specific domain names, which could lead to connectivity issues.
- The consistent usage of the same CoAP MID (Message ID) across multiple messages could suggest a problem. Normally, each message should have a unique MID to identify them independently.
- The flow includes multiple retransmissions and SACK messages which, while allowing for reliable transfer, could indicate packet loss or latency issues.
Summary of Protocols Used
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GTPv2:
- Standard: 3GPP TS 29.060
- Function: Primarily used for signaling in mobile broadband networks to manage bearer paths.
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S1AP:
- Standard: 3GPP TS 36.413
- Function: Handles signaling between the Evolved Packet Core (EPC) and the evolved NodeB (eNB).
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SCTP:
- Standard: IETF RFC 4960
- Function: A transport layer protocol used to transport user data in a network, providing reliable message-oriented communication.
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CoAP:
- Standard: IETF RFC 7252
- Function: Designed for use in resource-constrained networks and devices, enabling easy communication in the IoT domain.
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DNS:
- Standard: IETF RFC 1035
- Function: Resolves domain names to IP addresses, essential for networking.
Proposal for Entity Names
- AF: Access Function (e.g., "AccessGateway")
- AA: Access Application (e.g., "SessionManager")
- AE: Application Entity (e.g., "UserEquipment")
- AK: Application Kernel (e.g., "EPCController")
- AL: Application Layer (e.g., "DataHandler")
- AJ: Another Joint Application (e.g., "DataReceiver")
- AM: Application Message Processor (e.g., "MessageDispatcher")
- AC: Addressing Component (e.g., "Resolver")
- AB: Another Addressing Block (e.g., "DNSClient")
By assigning clearer names to the entities, the message flow can become easier to understand and analyze in the context of network operations and interactions.
