Method and device for realizing USSD (Unstructured Supplementary Service Data) function in IMS (IP Multimedia Subsystem) network

Abstract

The invention discloses a method and a device for realizing an USSD (Unstructured Supplementary Service Data) function in an IMS (IP Multimedia Subsystem) network, which relate to the field of a core network. The method comprises steps: protocol conversion processing is carried out on uplink USSD signaling from a terminal, uplink USSD signaling supported by an USSD center is obtained, and the uplink USSD signaling is sent to the USSD center; and protocol conversion processing is carried out on downlink USSD signaling from the USSD center, downlink USSD signaling supported by the terminal is obtained, and the downlink USSD signaling is sent to the terminal. When a 2G / 3G network is updated to the IMS network, the existing network resources can be effectively reused, and the investment cost of an operator is saved.

Description

technical field [0001] The present invention relates to the core network field, in particular to a method and device for realizing the function of Unstructured Supplementary Service Data Center (USSD) in an IP Multimedia Subsystem (IP Multimedia Subsystem, IMS) network. Background technique [0002] In the standard protocol, when the terminal is in the second-generation (2nd-Generation, 2G) or third-generation (3rd-Generation, 3G) network and in the IMS network, the interaction process between the terminal and the core network element USSD center is as follows: Figure 1 to Figure 4 shown. Among them, the flow chart of the interaction between the terminal registered in the 2G or 3G circuit switched (CircuitSwitched, CS) network and the USSD center is as follows: Figure 1 to Figure 2 As shown, the flow chart of the interaction between the terminal registered in the IMS network and the USSD center is as follows Figure 3 to Figure 4 shown. [0003] figure 1 It is a flow c...

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Problems solved by technology

[0021] Depend on Figure 1 to Figure 4 It can be seen that when a user registers in the IMS, according to the current standard protocol, the USSD signaling encapsulated by the SIP protocol is directly exchanged between the S-CSCF and the USSD center. Therefore, when the network is upgraded from the 2G / 3G CS network to the IMS network, the USSD center is required Support the SIP protocol, which requires the transformation of the original USSD center to support SIP signaling, which increases the difficulty of smooth network upgrades and increases the investment of operators

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