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UMTS - GPRS Tunneling Protocol
about 9 years ago
GTP protocol is designed for the tunneling and for the encapsulation of control messages in GPRS
GTP is available in two variants, control and user plane. GTP-C manages the control plane signaling, and it is important for the data transfer protocol to the user, GTP-U; it is called user plane. Current versions, suitable for EPS are GTPv1 US and GTPv2-C.
Control Plane of GPRS Tunneling Protocol
GTPv2-C is used on the EPC signaling interfaces (including SGSNs of at least Rel. 8). For example:
- S3 (between SGSN and MME),
- S4 (between SGSN and Serving GW),
- S5 and S8 (between Serving GW and PDN GW),
- S10 (between two MMEs), and
- S11 (between MME and Serving GW).
Message Type Message Additional Explanation 0 Reserved Shall never be used (intentionally excluded from protocol, to enforce explicit setting) 1/2 Echo Request/ Response Used to probe if a GTP version supported by the sending node. 3 Version Not Supported Indication Contains the latest GTP version supported the sending node. 4/5 Direct Transfer Request/ Response Used for tunneling signaling message on S101 interface for optimized handover, between HRPD access not and MME 6/7 Notification Request/ Response Used for tunneling notification on S101 between HRPD access node and MME 25/26 SRVCC PS to CS request Used to trigger and confirm SRVCC initiation between SGSN/MME and MSC server 27/28 SRVCC PS to CS complete Notification Used to indicated and confirm completion of SRVCC between MSC server and SGSN/ MME 32/33 Create Session Request Used to establish connectivity between two nodes 34/35 Modify Bearer Request Used to modify properties of a single or of multiple bearer, include bearer context information 36/37 Delete Session Request Tears down GTP control session 38/39 Change Notification request Used for reporting location information 66/67 Delete bearer command/ failure indication Instruct nodes to delete bearer and confirm back 68/69 Bearer resource command/ failure indication Used to allocate or modify resources 73 Stop paging indication Sent from SGW to the MME or SGSN 95/96 Create bearer request/ response Instruct nodes to install bearers and confirms back 97/98 Update bearer request Used to inform the control plane nodes from the user plane about bearer changes
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