The TI assigning unit 1104 is configured to assign the TI to the PDP context according to the RAU request message when the TI checking unit 1103 determines that the PDP context does not include a TI.

The TI sending unit 1105 is configured to send the TI to the UE.

Referring to FIG. 12, a first embodiment of an SGSN according to the present invention includes an activation request message receiving unit 1201, an attribute determining unit 1202, a converting unit 1203, and a parameter sending unit 1204.

The activation request message receiving unit 1201 is configured to receive an Activate PDP Context Request message sent by a UE.

The attribute determining unit 1202 is configured to determine whether the UE is a UE having a Pre-R8 attribute according to ability information of the UE in the Activate PDP Context Request message.

The converting unit 1203 is configured to convert a QoS parameter in the Activate PDP Context Request message when the UE is the UE having the Pre-R8 attribute.

The parameter sending unit 1204 is configured to send the converted QoS parameter to a PGW.

Referring to FIG. 13, a first embodiment of a PGW according to the present invention includes a bearer creating request message receiving unit 1301, a second attribute determining unit 1302, a second converting unit 1303, and a bearer creating unit 1304.

The bearer creating request message receiving unit 1301 is configured to receive a Default Bearer Request message sent by an SGSN.