7.7.14 Tunnel Endpoint Identifier Control Plane
29.0603GPPGeneral Packet Radio Service (GPRS)GPRS Tunnelling Protocol (GTP) across the Gn and Gp interfaceRelease 17TS
The Tunnel Endpoint Identifier Control Plane information element contains the Tunnel Endpoint Identifier for the control plane; it is assigned by the receiver of the flow. It distinguishes the tunnel from other tunnels between the same pair of entities. The value 0 is reserved for special cases defined in clause 8.2.
If the receiver has not yet assigned a TEID for this tunnel, it shall assign an unused value to the TEID.
If the receiver has already assigned a Tunnel Endpoint Identifier Control Plane to the tunnel, but has not yet received confirmation of successful assignment from the transmitter, this information element shall take the same value as was sent before for this tunnel.
The receiver receives confirmation of successful assignment of its Tunnel Endpoint Identifier Control Plane from the transmitter when it receives any message with its assigned Tunnel Endpoint Identifier Control Plane in the GTP header from the transmitter.
If the Tunnel Endpoint Identifier Control Plane is received from the transmitter, this information element shall be stored.
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Bits |
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Octets |
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
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1 |
Type = 17 (Decimal) |
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2 – 5 |
Tunnel Endpoint Identifier Control Plane |
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Figure 22: Tunnel Endpoint Identifier Control Plane Information Element