Method and system for realizing radio voice call continuity (RVCC)

Abstract

The invention relates to a method and a system for realizing radio voice call continuity (RVCC). The method comprises the following steps that a core network determines and sends single RVCC (SRVCC) ability information shared with user equipment (UE) initiating the radio voice to a current radio access network system, wherein the shared SRVCC ability information shows the SRVCC ability information to different radio access network systems; and after the UE initiates the radio voice, the current radio access network system judges to trigger SRVCC to a target cell when judging that the SRVCC ability information sent by the core network shows support of the SRVCC ability to the target cell corresponding to the inter-system measurement report. By adopting the method and the system, the current radio access network system can correctly trigger the SRVCC flow and avoid handover failure.

Description

technical field [0001] The present invention relates to a mobile communication system, more specifically, to a method and system for realizing voice service call continuity. Background technique [0002] SRVCC (Single Radio Voice Call Continuity, single voice call continuity) function is to ensure that voice service users move from LTE (Long Term Evolution, long-term evolution) network to UTRAN (UMTS Terrestrial Radio Access Network-UMTS Terrestrial Radio Access Network) / GERAN (GSM EDGE Radio Access Network, GSM / EDGE wireless access network) or CDMA2000lxRTT (a CDMA2000 type based on radio transmission technology (RTT)) system, the continuity of voice services. [0003] In the initial stage of LTE network deployment, the coverage of the entire network will not be achieved, but the coverage of hotspot areas will be mainly covered. When the deployed LTE network provides VoIP (voice) services, users who initiate VoIP services in the LTE network will leave the coverage of LTE. ...

AI Technical Summary

Problems solved by technology

[0011] There is a problem here: because the two different SRVCC procedures of the UE for different target systems correspond to two UE capabilities respectively, and there is only one "SRVCC Operation Possible" indication field delivered by the MME to the eNB, so the UE only supports one In the case of SRVCC, this field cannot indicate the SRVCC process of which target system the UE actually supports, and errors will be caused when the MME fills in the cells and the eNB makes SRVCC decisions

[0013] Question 1: How should the "SRVCC Operation Possible" field be filled in the UE Context Setup Request message or HandoverRequest message sent by the MME to the eNB? If it is filled in as "Possible", it may cause the eNB to mistakenly trigger the SRVCC process when it decides the handover between UE and CDMA2000lxRTT; if it does not carry this information element, it will cause the eNB to fail to trigger the SRVCC process to UTRAN / GERAN

[0014] Question 2: Assume that in question 1, the MME sets the "SRVCC Operation Possible" field to "Possible", if the UE initiates a voice service in the E-UTRAN network at this time, and because it reaches the edge of the E-UTRAN network, the adjacent CDMA2000lx neighbor cell The quality meets the different system measurement criteria, and the measurement report is reported to the eNB. The eNB mistakenly believes that both the UE and the target CDMA2000lxRTT network support SRVCC through the saved "SRVCC Operation Possible" field, so it triggers the SRVCC process to the target CDMA2000lx neighbor cell, resulting in handover failure. Service interruption affects user experience

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