umts signalling
TRANSCRIPT
UMTSUniversal MobileTelecommunicationsSystem
Signalling
Signalling protocol details
Chapter contents
» UMTS Protocol Internetworking Architecture
» Part 1: Transport Network Protocols, CS and PS
» Part 2: Radio Network Protocols, CS and PS
» Part 3: System Network Protocols, CS and PS
» Examples of UMTS procedures
UMTS Network Protocol Architecture
Transport Network Layer
Radio Network Layer
System Network Layer
Uu Iub Iu E / Gn
User Plane
Control Plane
User Plane
Control Plane
User Plane
Control Plane
NodeB RNC MSC VLR SGSN GMSC GGSN
UMTS Network Transactions
Uu / Iub – Control-Plane
ATM
AAL2
UP FP
MAC
RLC
RRC
MM/SM/CC
AAL5
SSCOP
SSCF- UNI
STC
AAL2L3 NBAP
WCDMA
MAC
RLC
RRC
MM / SM / CC
NodeB RNC
Uu / Iub – User-Plane
ATM
AAL2
UP FP
MAC
RLC
PDCP BMC
Application data
WCDMA
MAC
RLC
PDCP BMC
Application data
NodeB RNC
Iur – User- / Control-Plane
User-Plane
RRC
ATM
AAL2
UP FP
MAC
RLC
AAL5
SSCOP
SSCF-NNI
IP
SCTP
MTP3-B M3UA
STC
AAL2L3
MM/SM/CC
ATM
AAL2
UP FP
MAC
RLC
PDCP BMC
Application data
Control-Plane
SCCP
RNSAP
RNCRNCRNC
RLP
TAF AMR
IuCS – User- / Control-Plane
User-Plane
ATM
AAL2
Iu UP
Application data
Control-Plane
ATM
AAL5
SSCOP
SSCF-NNI
IP
SCTP
MTP3-B M3UA
SCCP STC
AAL2L3RANAP
MM/SM/CC
RNC RNCMSC
IuPS – User- / Control-Plane
User-Plane
ATM
AAL5
IP
IP
Control-Plane
ATM
AAL5
SSCOP
SSCF-NNI
IP
SCTP
MTP3-B M3UA
SCCP
RANAP
MM / CC / SS
UDP
GTP-U
Application data
RNC RNCSGSN
E – User- / Control-Plane
Control-Plane
PCM
MTP-L2
MTP-L3
User-Plane
Application data
SCCP
TCAP
MAP
PCM
ISUP
MSCVLR
MSCVLR
MSCVLR
Gn – User- / Control-Plane
Control-Plane
ATM
AAL5
Ethernet
IP
UDP
ATM
AAL5
Ethernet
IP
UDP
GTP-U
User-Plane
IP
Application data
GTP-C
SGSN GGSN SGSN
Signalling Part 2
Radio Network Layer
ASN.1
RRC, NBAP, RNSAP and RANAPAAL2L3 (ALCAP)
Iu UP, AMR, TAF, RLPPDCP and BMC
RRC
» Radio Resource Control
» Routing of higher layer messages to different MM/CM entities (UE side) or different core network domains
» Creation and management of Radio Bearers
» Broadcasting of System Information
» Paging of UEs
» Dedicated Control handles all functions specific to one UE
» Location Management
» Handover
» Power Management (outer loop power control)
» Configuration of lower layer protocols
» Management of measurement reports
» Specified in 3GPP 25.331
RRC States
Idle Mode
Camping on a UTRAN cell Camping on a GSM cellGPRS idle mode
UTRAN Connected Mode
CELL_DCH CELL_FACH
URA_PCH CELL_PCH
EstablishDedicated
RRC-Connection
ReleaseDedicated
RRC-Connection
EstablishSharedRRC-
ConnectionReleaseSharedRRC-
Connection GPRSPacket
TransferMode
Initof
TBF
Rel.of
TBF
GSM Connected
Mode
EstablishRR-
Connection
ReleaseRR-
Connection
GSM: Handover
UTRAN: Inter-RAT Handover
Cellreselection
RRC – UMTS Connected Mode States
UTRAN Connected Mode
CELL_DCH
CELL_PCH
Release last dedicated channel
Allocation of dedicated channel
RRC State Indicator:URA_PCH
RRC Sta
te In
dicato
r: URA_PCH
RRC State Indicator:
CELL_PCH
Pagingor
Init. UL transfer
Paging o
r Init.
UL tr
ansfer
CELL_FACH
URA_PCH
RRC Connection Establishment
„ ... a point-to-point bi-directional connection between RRC peer entitiesin the UE and the UTRAN characterised by the allocation of a U-RNTI.
A UE has either zero or one RRC connection.“RNC
( RLC-SAP: TM, CCCH ) RRC CONNECTION REQUEST
[ RRC TAId, Initial UE Id, Establishment Cause ]
( RLC-SAP: UM, CCCH ) RRC CONNECTION SETUP
[ RRC TAId, new U-RNTI, SRB ]
( RLC-SAP: AM, DCCH ) RRC CONNECTION SETUP COMPLETE
[ RRC TAId, UE Radio Acces Capability ]Successful
Unsuccessful ( RLC-SAP: TM, CCCH ) RRC CONNECTION REQUEST
[ RRC TAId, Initial UE Id, Establishment Cause ]
( RLC-SAP: UM, CCCH ) RRC CONNECTION REJECT
[ RRC TAId, Cause ]
Idle
Connected
RRC Connection Release
RNC
( RLC-SAP: UM, DCCH ) RRC CONNECTION RELEASE
[ RRC TAId, Release Cause ]
( RLC-SAP: UM / AM, DCCH ) RRC CONNECTION RELEASE COMPLETE
[ RRC TAId ]
( RLC-SAP: UM, CCCH ) RRC CONNECTION RELEASE
[ U-RNTI, RRC TAId, Release Cause ]
RRC Signalling Connection
RNC
( RLC-SAP: AM, DCCH ) INITIAL DIRECT TRANSFER
[ CN Domain Id, NAS SDU ]
( RLC-SAP: AM, DCCH ) UPLINK DIRECT TRANSFER
[ CN Domain Id, NAS SDU ]
( RLC-SAP: AM, DCCH ) DOWNLINK DIRECT TRANSFER
[ RRC TAId, CN Domain Id, NAS SDU ]
( RLC-SAP: AM, DCCH ) SIGNALLING CONNECTION RELEASE
[ RRC TAId, CN Domain Id ]
RRC Radio Bearer Setup
RNC
( RLC-SAP: AM, DCCH ) RADIO BEARER SETUP * COMPLETE
[ RRC TAId ]
( RLC-SAP: AM, DCCH ) RADIO BEARER SETUP *
[ RRC TAId, SRB and RB Info / List etc. ]
( RLC-SAP: AM, DCCH ) RADIO BEARER SETUP * FAILURE
[ RRC TAId , Failure Cause ]
( RLC-SAP: AM, DCCH ) RADIO BEARER SETUP *
[ RRC TAId, SRB and RB Info / List etc. ]
NBAP
» Node B Application Part
» Cell Configuration Management
» Common Transport Channel Configuration
» System Information Management
» Resource Event Management
» Measurements on common and dedicated resources
» Radio Link Management of dedicated resources
» Radio Link Supervision
» Specified in 3GPP 25.433
NBAP Elementary Procedure
» Two classes of elementary procedures:
» Class 1: Elementary procedure with response,
success or failure
» Class 2: Elementary procedure without response
» NBAP Initiating Message is transporting the procedure request
» For Class 1 elementary procedure the response is transmitted
» Success: Successful Outcome Message
» Failure: Unsuccessful Outcome Message
» The elementary procedure is identified by the parameter
Procedure Identification Code.
» The CRNC Communication Context contains all info for the CRNC tocommunicate with a specific UE.
» The Context is identified by the parameter
CRNC Communication Context Identifier.
NBAP Example Procedure
RNC
INITIATING MESSAGE
[ Procedure Code: RADIO LINK SETUP,
Transaction-Id, C-Id, Channel parameter ]
NodeB
SUCCESSFUL OUTCOME
[ Procedure Code: RADIO LINK SETUP,
Transaction-Id, Channel parameter ]Successful
Unsuccessful
INITIATING MESSAGE
[ Procedure Code: RADIO LINK SETUP,
Transaction-Id, C-Id, Channel parameter ]
UNSUCCESSFUL OUTCOME
[ Procedure Code: RADIO LINK SETUP,
Transaction-Id, Cause ]
RANAP
» Radio Access Network Application Part
» Transfer of NAS-PDU between CN and UTRAN
» Overall RAB management
» Relocating of SRNC
» Controlling the security mode of UTRAN
» Paging the UE
» Release of RAB and the Iu connection resources
» SCCP uses SSN=142 for RANAP identification
» Specified in 3GPP 25.413
RANAP Elementary Procedure
» Three classes of elementary procedures:
» Class 1: Elementary procedure with response
( success and / or failure )
» Class 2: Elementary procedure without response
» Class 3: Elementary procedure with possibility of
multiple responses ( success and/or failure )
» RANAP Initiating Message is transporting the procedure request
» For Class 1 elementary procedure the response is transmitted
» Success: Successful Outcome Message
» Failure: Unsuccessful Outcome Message
» For Class 3 elementary procedure the response is transmitted as
Outcome Message
RANAP Example Procedure
RNC
INITIATING MESSAGE
[ Procedure Code: INITIAL UE MESSAGE,
CN Domain Id, LAI, SAI, Iu Signal.Conn.Id, NAS PDU ]
INITIATING MESSAGE
[ Procedure Code: SECURITY MODE CONTROL,Integrity protection info, key status ]
SUCCESSFUL OUTCOME
[ Procedure Code: SECURITY MODE CONTROL,Integrity protection algorithm ]
MSC
Class 2
Class 1
INITIATING MESSAGE
[ Procedure Code: RAB ASSIGNMENT,RAB Id and Info, Cause ]
OUTCOME
[ Procedure Code: RAB ASSIGNMENT,Success or failure IEs for RAB Id and Info ]
Class 3
Signalling Part 3
System Network LayerCircuit Switched:
Mobility Management and Call Control
control plane between CN nodes
Packet Switched:Mobility and Session Management
control plane between CN nodes
Location Based Services
CS Mobility Management
» Procedures well known from GSM
» MM procedures to establish and release connections.
» Transfer of Call Management (CM) sublayer messages.
» MM common procedures for security functions, e.g.
Authentication procedure.
» MM specific procedures for location functions like
Periodic location updating or IMSI attach procedure.
» UE identified by IMSI or TMSI.
» Specified in 3GPP 24.008
CS Call Control
» Procedures well known from GSM
» CC establishes and releases CC connections between UE and
CN.
» Activation of voice/multimedia codec.» Based on 3G-324M, variant of H.324. See 3GPP 26.111.
» Interworking with RANAP for establishment of a RAB.» CC SETUP QoS will be mapped onto RANAP RAB assignment.
» Specified in 3GPP 24.008
CS MOC Example
MM: CM Service Request[ Mobile Identity, MS Classmark ]
MM: CM Service Accept
MSC VLR
CC: Setup[ Called Party Number, Bearer Capability ]
CC: Call Proceeding
CC: Alert
CC: Connect
CC: Connect Ack.
MM: Authentication Request
MM: Authentication Response
Call set-up
Call release CC: Disconnect [ Cause ]
CC: Relase
CC: Reease Complete
PS Mobility Management
» Procedures well known from GPRS (GMM)
» GMM protocol makes use of a signalling connection between UE and SGSN.
» GMM establishes and releases GMM contexts, e.g. GPRS Attach.
» GMM specific procedures for location functions likePeriodic routing area updating.
» New message implemented to provide service to CM sublayer on topof GMM:
» SERVICE REQUEST message
» Initiated by UE, used to establish a secure connection to the network and
to request the bearer establishment for sending data.
» UE identified by IMSI or P-TMSI
» Specified in 3GPP 24.008
PS Session Management
» Procedures well known from GPRS (SM)
» Counterpart to CS CC protocol, i.e.
it is used to establish and release packet data sessions.
» SM procedures to setup and release one or more
PDP contexts.
» PDP Contexts are handled in UE and GGSN.
» SGSN represents interworking function.
» Specified in 3GPP 24.008
PS Activate PDP Context Example
GMM: Service Request[ Mobile Identity, MS Classmark ]
GMM: Service Accept
SM: Activate PDP Context Request[ APN, Type of PDP-Address, QoS ]
SM: Activate PDP Context Accept[ PDP-Address, QoS ]Connection
set-up
Connectionrelease SM: Deactivate PDP Context Request
SM: Deactivate PDP Context Accept
SGSN
Iu Procedures
• Location Update on IuCS
• MOC on IuCS
• MTC on IuCS
• Attach on IuPS
• PDP Context on IuPS
Location Update on IuCS 1/2
NodeB
Initial Direct Transfer [ NAS: LUREQ ]
DL Direct Transfer [ NAS: AUTREQ ]
RNC MSC
CR – RANAP: * Initial UE Message [ MM: LUREQ ]
CC
DT1 – RANAP: * Direct Transfer [ MM: AUTREQ ]
UL Direct Transfer [ NAS: AUTRESP ]DT1 – RANAP: * Direct Transfer [ MM: AUTRESP ]
DT1 – RANAP: * Common ID
* : Initiating Message
RRC Connection Setup
RRC Connection Request
NBAP: Radio Link Setup
AAL2L3: Establish
Location Update on IuCS 2/2
NodeB
DL Direct Transfer [ NAS: LUACC ]
RNC MSC
DT1 – RANAP: * Direct Transfer [ MM: LUACC ]
DT1 – RANAP: InitiatingMsg [ Iu Release ]RRC Connection Release
DT1 – RANAP: SuccOutcome [ Iu Release ]
NBAP: Radio Link Deletion
RLSD
RLC
AAL2L3: Release
Security Mode CompleteDT1 – RANAP: SuccOutcome [ Security Mode Control ]
Security Mode Command DT1 – RANAP: InitiatingMsg [ Security Mode Control ]
* : Initiating Message
MOC on IuCS 1/4
NodeB
Initial Direct Transfer [ NAS: CMSREQ ]
DL Direct Transfer [ NAS: AUTREQ ]
RNC MSC
CR – RANAP: * Initial UE Message [ MM: CMSREQ ]
CC
DT1 – RANAP: * Direct Transfer [ MM: AUTREQ ]
UL Direct Transfer [ NAS: AUTRESP ]DT1 – RANAP: * Direct Transfer [ MM: AUTRESP ]
DT1 – RANAP: * Common ID
Security Mode Command
Security Mode Complete
DT1 – RANAP: InitiatingMsg [ Security Mode Control ]
DT1 – RANAP: SuccOutcome [ Security Mode Control ]
* : Initiating Message
UL Direct Transfer [ NAS: SETUP ]DT1 – RANAP: * Direct Transfer [CC : SETUP ]
MOC on IuCS 2/4
NodeB RNC MSC
* : Initiating Message
DL Direct Transfer [ NAS: CPROC ]DT1 – RANAP: * Direct Transfer [ MM: CPROC ]
DT1 – RANAP: InitiatingMsg [ RAB Assignment ]
NBAP: Synchronised Radio LinkReconfiguration Preparation
AAL2L3: Establish Request
AAL2L3: Establish Confirm
AAL2L3: Establish Request
AAL2L3: Establish Confirm
Iu UP: ProcCode [ Initialisation ]
Iu UP: Ack
Radio Bearer Setup
DT1 – RANAP: Outcome [ RAB Assignment ]
MOC on IuCS 3/4
NodeB RNC MSC
* : Initiating Message
DL Direct Transfer [ NAS: ALERT ]DT1 – RANAP: * Direct Transfer [CC : ALERT ]
Iu UP: Type 0 [ AMR data ]
DL Direct Transfer [ NAS: CONNECT ]DT1 – RANAP: * Direct Transfer [CC : CONNECT ]
DL Direct Transfer [ NAS: CONN ACK ]DT1 – RANAP: * Direct Transfer [CC : CONN ACK ]
Iu UP: Type 0 [ AMR data ]
Iu UP: Type 0 [ AMR data ]
DL Direct Transfer [ NAS: DISC ]DT1 – RANAP: * Direct Transfer [CC : DISC ]
DL Direct Transfer [ NAS: RELEASE ]DT1 – RANAP: * Direct Transfer [CC : RELEASE ]
DL Direct Transfer [ NAS: REL COMP ]DT1 – RANAP: * Direct Transfer [CC : REL COMP ]
MOC on IuCS 4/4
NodeB RNC MSC
DT1 – RANAP: InitiatingMsg [ Iu Realease ]RRC Connection Release
AAL2L3: Release Request
AAL2L3: Release Confirm
AAL2L3: Relase ( DTCH )
DT1 – RANAP: SuccOutcome [ Iu Release ]
NBAP: Radio Link Deletion
AAL2L3: Relase ( DCCH )
RLSD
RLC
MTC on IuCS 1/5
NodeB
( PCH ) Paging Type 1
RNC MSC
UDT – RANAP: Paging
* : Initiating Message
AAL2L3: Establish ( DCCH )
NBAP: Radio Link Setup
UL – DL – SYNC
RRC Connection Request
RRC Connection Setup
RRC Connection Setup Comp
Initial Direct Transfer [ NAS: PRES ]CR – RANAP: * Initial UE Message [ MM: PRES ]
CC
MTC on IuCS 2/5
NodeB
DL Direct Transfer [ NAS: AUTREQ ]
RNC MSC
DT1 – RANAP: * Direct Transfer [ MM: AUTREQ ]
UL Direct Transfer [ NAS: AUTRESP ]DT1 – RANAP: * Direct Transfer [ MM: AUTRESP ]
DT1 – RANAP: * Common ID
Security Mode Command
Security Mode Complete
DT1 – RANAP: InitiatingMsg [ Security Mode Control ]
DT1 – RANAP: SuccOutcome [ Security Mode Control ]
* : Initiating Message
DL Direct Transfer [ NAS: SETUP ]DT1 – RANAP: * Direct Transfer [CC : SETUP ]
UL Direct Transfer [ NAS: CCONF ]DT1 – RANAP: * Direct Transfer [CC : CCONF ]
MTC on IuCS 3/5
NodeB RNC MSC
DT1 – RANAP: InitiatingMsg [ RAB Assignment ]
Synchronised Radio LinkReconfiguration Preparation
AAL2L3: Establish Request
AAL2L3: Establish Confirm
AAL2L3: Establish Request
AAL2L3: Establish Confirm
Iu UP: ProcCode [ Initialisation ]
Iu UP: AckNBAP: Radio Bearer Setup
DT1 – RANAP: Outcome [ RAB Assignment ]
MTC on IuCS 4/5
NodeB RNC MSC
* : Initiating Message
DL Direct Transfer [ NAS: ALERT ]DT1 – RANAP: * Direct Transfer [ CC: ALERT ]
Iu UP: Type 0 [ AMR data ]
DL Direct Transfer [ NAS: CONNECT ]DT1 – RANAP: * Direct Transfer [ CC: CONNECT ]
DL Direct Transfer [ NAS: CONN ACK ]DT1 – RANAP: * Direct Transfer [ CC: CONN ACK ]
Iu UP: Type 0 [ AMR data ]
Iu UP: Type 0 [ AMR data ]
DL Direct Transfer [ NAS: DISC ]DT1 – RANAP: * Direct Transfer [CC : DISC ]
DL Direct Transfer [ NAS: RELEASE ]DT1 – RANAP: * Direct Transfer [CC : RELEASE ]
DL Direct Transfer [ NAS: REL COMP ]DT1 – RANAP: * Direct Transfer [CC : REL COMP ]
MTC on IuCS 5/5
NodeB RNC MSC
DT1 – RANAP: InitiatingMsg [ Iu Realease ]RRC Connection Release
AAL2L3: Release Request
AAL2L3: Release Confirm
AAL2L3: Relase ( DTCH )
DT1 – RANAP: SuccOutcome [ Iu Release ]
NBAP: Radio Link Deletion
AAL2L3: Relase ( DCCH )
RLSD
RLC
Attach on IuPS 1/2
NodeB
RRC Connection Setup
RRC Connection Request
Initial Direct Transfer [ NAS: ATRQ ]
DL Direct Transfer [ NAS: ACRQ ]
RNC
CR – RANAP: * Initial UE Message [ GMM: ATRQ ]
CC
DT1 – RANAP: * Direct Transfer [ GMM: ACRQ ]
UL Direct Transfer [ NAS: ACRE ]DT1 – RANAP: * Direct Transfer [ GMM: ACRE ]
* : Initiating Message
NBAP: Radio Link Setup
AAL2L3: Establish
SGSN
Attach on IuPS 2/2
NodeB
DL Direct Transfer [ NAS: ATAC ]
RNC MSC
DT1 – RANAP: * Direct Transfer [ GMM: ATAC ]
DT1 – RANAP: InitiatingMsg [ Iu Release ]RRC Connection Release
DT1 – RANAP: SuccOutcome [ Iu Release ]
NBAP: Radio Link Deletion
RLSD
RLC
AAL2L3: Release
Security Mode CompleteDT1 – RANAP: SuccOutcome [ Security Mode Control ]
Security Mode Command DT1 – RANAP: InitiatingMsg [ Security Mode Control ]
UL Direct Transfer [ NAS: ACOM ]DT1 – RANAP: * Direct Transfer [ GMM: ACOM ]
* : Initiating Message
PDP Context on IuPS 1/3
NodeB
Initial Direct Transfer [ NAS: SREQ ]
DL Direct Transfer [ NAS: ACRQ ]
RNC MSC
CR – RANAP: * Initial UE Message [ GMM: SREQ ]
CC
DT1 – RANAP: * Direct Transfer [ GMM: ACRQ ]
UL Direct Transfer [ NAS: ACRE ]DT1 – RANAP: * Direct Transfer [ GMM: ACRE ]
DT1 – RANAP: * Common ID
Security Mode Command
Security Mode Complete
DT1 – RANAP: InitiatingMsg [ Security Mode Control ]
DT1 – RANAP: SuccOutcome [ Security Mode Control ]
* : Initiating Message
PDP Context on IuPS 2/3
NodeB RNC MSC
* : Initiating Message
DT1 – RANAP: InitiatingMsg [ RAB Assignment ]
NBAP: Synchronised Radio LinkReconfiguration Preparation
AAL2L3: Establish
NBAP: Radio Bearer Setup
DT1 – RANAP: Outcome [ RAB Assignment ]
DL Direct Transfer [ NAS: APCA ]DT1 – RANAP: * Direct Transfer [ SM : APCA ]
UL Direct Transfer [ NAS: APCR ]DT1 – RANAP: * Direct Transfer [SM : APCR ]
Application data flowon dedicated VPI/VCI
using AAL5
PDP Context on IuPS 3/3
NodeB RNC MSC
DT1 – RANAP: InitiatingMsg [ Iu Realease ]RRC Connection Release
AAL2L3: Relase ( DTCH )
DT1 – RANAP: SuccOutcome [ Iu Release ]
NBAP: Radio Link Deletion
AAL2L3: Relase ( DCCH )
RLSD
RLC
UL Direct Transfer [ NAS: DPCR ]DT1 – RANAP: * Direct Transfer [SM : DPCR ]
DL Direct Transfer [ NAS: DPCA ]DT1 – RANAP: * Direct Transfer [ SM : DPCA ]
CS-Control Plane between CN nodes
» Standard SS#7 protocols are used as control plane transport layers.
» For circuit switched procedures ISDN user part is used to setup connections and to control the traffic channel.
» Procedures for network specific functions are handled by the MAPprotocol, known from GSM/GPRS.
» Procedures for subscriber specific functions are handled by INAP and CAP protocol, also know from GSM/GPRS.
» More or less old specification numbers are used. Version number will indicate the type of network standard (GSM, GPRS or UMTS)
GPRS Tunneling Protocol Interfaces
» Three types of GTP protocols1. GTP – Control Plane
2. GTP – User Plane
3. GTP‘
other PLMN
SGSN GGSN
CGF
SGSN
SGSN
UTRAN
UTRAN
3.
1. + 2.
2.
2.
GTP
» Tunnel is identified by Tunnel Endpoint Identifier
» C-Plane: TID-C; U-Plane: TID-D (Data)
» GTP-C:» Establish, management and release of user specific tunnels between
GSNs for exchange of signalling information.
» supports creation, modification and deletion of PDP Contexts
» supports mobility management (relocation of RNC)
» GTP-U:» Transport of application data
» GTP‘:» Transport of charging data records from SGSN and GGSN to Charging
Gateway.
» Specified in 3GPP 29.060
GTP – C and – U Example
GTP-C-TM: Create PDP Context Request[ TID-C, DL-TID-D, MSISDN, NSAPI, APN, PDP-Info ]
GTP-C-TM: Create PDP Context Response[ TID-C, UL-TID-D, PDP-Address, Cause ]
PDP Contextset-up
PDP Contextrelease
SGSN GGSN
GTP-U: Tunnel-PDU[ UL-TID-D, ]
GTP-U: Tunnel-PDU[ UL-TID-D, ]
GTP-U: Tunnel-PDU[ DL-TID-D, ]
GTP-C-TM: Delete PDP Context Request[ TID-C, NSAPI, Teardown Ind ]
GTP-C-TM: Delete PDP Context Response[ TID-C, Cause ]