CN108966274B

CN108966274B - Inter-system switching method and user equipment

Info

Publication number: CN108966274B
Application number: CN201811126854.9A
Authority: CN
Inventors: 马裕清
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2018-09-26
Filing date: 2018-09-26
Publication date: 2022-04-05
Anticipated expiration: 2038-09-26
Also published as: CN108966274A

Abstract

The present application relates to the field of communications. The application provides a heterogeneous system switching method and user equipment, wherein the method comprises the following steps: the user equipment judges whether the condition of sending a request for triggering SRVCC switching to a base station is met; detecting whether the user equipment and internet protocol multimedia subsystem network equipment support bSRVCC; if the user equipment and/or the internet protocol multimedia subsystem network equipment do not support bSRVCC, when the condition of sending the SRVCC switching triggering request is met, the user equipment sends the SRVCC switching triggering request to the base station after receiving the ringing message. The method and the device greatly improve the success rate of SRVCC switching and the call success rate of voice under VoLTE.

Description

Inter-system switching method and user equipment

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method for inter-system handover and a user equipment.

Background

As an IP network, a Long Term Evolution (LTE)/Evolved Packet Core (EPC) network is used, and a standard Voice scheme thereof is to use an Internet Protocol (IP) Multimedia Subsystem (IP Multimedia Subsystem (IMS) to carry Voice services under the LTE network, that is, Voice over LTE (Voice over LTE). Considering that the initial deployment of LTE/EPC is hot-spot coverage, which gradually includes points and areas, a traditional Circuit Switched (CS) network can make up for LTE coverage deficiency. Therefore, the LTE/EPC adopts a Single Radio Voice Call Continuity (SRVCC) technology to complete the Voice service switching from the LTE to the CS network. However, at present, there is a case of handover failure, which causes call failure of the ue, and the SRVCC success rate needs to be improved.

Disclosure of Invention

The application provides a heterogeneous system switching method and user equipment, which greatly improve the success rate of SRVCC switching and the success rate of voice calling under VoLTE.

In a first aspect, the present application provides a method for inter-system handover, where a ue determines whether a condition for sending a request for triggering SRVCC handover to a base station is satisfied; detecting whether the user equipment and internet protocol multimedia subsystem network equipment support bSRVCC; if the user equipment and/or the internet protocol multimedia subsystem network equipment do not support bSRVCC, when the condition of sending the SRVCC switching triggering request is met, the user equipment sends the SRVCC switching triggering request to the base station after receiving the ringing message.

Wherein, still include: and if the user equipment and/or the Internet protocol multimedia subsystem network equipment do not support bSRVCC, after a preset timer is overtime, the user equipment sends a request for triggering SRVCC switching to the base station.

Wherein, still include: if the user equipment and/or the internet protocol multimedia subsystem network equipment do not support bSRVCC, after the preset first timer is overtime, the user equipment detects whether a ringing message is received, if the ringing message is not received, after the preset second timer is overtime, the user equipment sends a request for triggering SRVCC switching to the base station.

Wherein the timing time of the first timer is greater than the timing time of the second timer.

Wherein, still include: and the user equipment stops the timer after receiving the ringing message.

Wherein detecting whether the user equipment and the Internet protocol multimedia subsystem network equipment support bSRVCC comprises: obtaining whether the user equipment supports bSRVCC from the configuration information of the user equipment; and acquiring whether the Internet protocol multimedia subsystem network equipment supports bSRVCC according to the information returned to the user equipment by the Internet protocol multimedia subsystem network equipment.

Wherein, the determining, by the ue, whether the condition for sending the SRVCC handover triggering request to the base station is satisfied includes: and the UE judges whether the events B1 and/or B2 meet the conditions reported to the base station.

Wherein the request to trigger the SRVCC handover comprises a measurement report of a B1 and/or B2 event.

In a second aspect, the present application provides a user equipment, including: a judging unit, configured to judge whether a condition for sending a request for triggering SRVCC handover to a base station is satisfied; a detecting unit, configured to detect whether the user equipment and an internet protocol multimedia subsystem network device support bSRVCC; and the sending unit is used for sending the SRVCC switching triggering request to the base station after the user equipment receives the ringing message when the user equipment and/or the Internet protocol multimedia subsystem network equipment do not support bSRVCC.

Wherein the sending unit is further configured to: and if the user equipment and/or the Internet protocol multimedia subsystem network equipment do not support bSRVCC, after a preset timer is overtime, the user equipment sends a request for triggering SRVCC switching to the base station.

Wherein the sending unit is further configured to: if the user equipment and/or the internet protocol multimedia subsystem network equipment do not support bSRVCC, after the preset first timer is overtime, the user equipment detects whether a ringing message is received, if the ringing message is not received, after the preset second timer is overtime, the user equipment sends a request for triggering SRVCC switching to the base station.

Wherein the sending unit is further configured to: and stopping the timer after the user equipment receives the ringing message.

Wherein the detection unit is configured to: obtaining whether the user equipment supports bSRVCC from the configuration information of the user equipment; and acquiring whether the Internet protocol multimedia subsystem network equipment supports bSRVCC according to the information returned to the user equipment by the Internet protocol multimedia subsystem network equipment.

Wherein the judging unit is configured to: and judging whether the events B1 and/or B2 meet the condition reported to the base station.

In a third aspect, the present application provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of any of the methods described above.

In a fourth aspect, the present application provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of any of the above methods when executing the program.

The inter-system switching method has the following beneficial effects:

in the application, the user equipment judges whether a condition of sending a request for triggering SRVCC handover to a base station is met, whether the user equipment and the IMS network equipment support bSRVCC is detected, if the user equipment and/or the IMS network equipment do not support bSRVCC, the user equipment sends the request for triggering SRVCC handover to the base station after receiving a ringing message, namely, a measurement report is reported to the base station, namely, the measurement report is sent in a delayed manner, because the handover of the user equipment after receiving the ringing message is not bSRVCC, the bSRVCC is avoided being triggered, and the handover is changed into the handover of other types of SRVCC, such as aSRVCC, the success rate of SRVCC handover is improved, and the success rate of a VoLTE call under an LTE weak signal is also improved.

Drawings

Fig. 1 is a diagram of a network system architecture implementing SRVCC;

FIG. 2 is a first flowchart illustrating a method for inter-system handover according to the present application;

FIG. 3 is a second flowchart illustrating a method for inter-system handover according to the present application;

fig. 4 is a third schematic flowchart of the inter-system handover method of the present application;

fig. 5 is a fourth flowchart illustrating a method for inter-system handover according to the present application;

fig. 6 is a first schematic structural diagram of a user equipment according to the present application;

fig. 7 is a schematic structural diagram of a user equipment according to the present application.

Detailed Description

The present application is further described with reference to the following figures and examples.

In the following description, the terms "first" and "second" are used for descriptive purposes only and are not intended to indicate or imply relative importance. The following description provides embodiments of the invention, which may be combined or substituted for various embodiments, and this application is therefore intended to cover all possible combinations of the same and/or different embodiments described. Thus, if one embodiment includes feature A, B, C and another embodiment includes feature B, D, then this application should also be considered to include an embodiment that includes one or more of all other possible combinations of A, B, C, D, even though this embodiment may not be explicitly recited in text below.

In the following description, the expressions "have", "may have", "include" and "include" or "may include" and "may include" indicate the presence of corresponding features (e.g., elements such as values, functions, operations or components), but do not preclude the presence of additional features.

In the following description, when one element (e.g., a first element) is referred to as being "operatively or communicatively coupled" or "connected" to another element (e.g., a second element), it may be directly coupled or connected to the other element or intervening elements (e.g., third elements) may be present. On the other hand, when one element (e.g., a first element) is referred to as being "directly coupled" or "directly connected" to another element (e.g., a second element), it is understood that there are no intervening elements (e.g., third elements).

The following description provides examples, and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements described without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For example, the described methods may be performed in an order different than the order described, and various steps may be added, omitted, or combined. Furthermore, features described with respect to some examples may be combined into other examples.

It should be noted that in the following description, the terms "system" and "network" are often used interchangeably.

The application is applied to a network system for voice communication through an IMS network, including but not limited to an LTE network system.

User Equipment (UE) in this application may refer to a device that provides voice and/or data connectivity to a User, a handheld device with wireless connectivity, or other processing device connected to a wireless modem. A UE may communicate with one or more core networks via a Radio Access Network (RAN), and may be a mobile terminal such as a mobile telephone (or "cellular" telephone) and a computer having a mobile terminal, such as a portable, pocket, hand-held, computer-included, or vehicle-mounted mobile device, that exchanges languages and/or data with the RAN. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). A Base Station (BS) device, which may also be referred to as a Base Station in this application, is a device deployed in a radio access network to provide wireless communication functions. The device for providing the Base Station function in the 2G Network includes a Base Transceiver Station (BTS) and a Base Station Controller (BSC), the device for providing the Base Station function in the 3G Network includes a Node B (Node B) and a Radio Network Controller (RNC), the device for providing the Base Station function in the 4G Network includes an Evolved Node B (eNodeB), and the device for providing the Base Station function in the WLAN is an Access Point (AP).

IMS Voice is used in LTE networks, however, LTE networks have low coverage at the initial deployment stage, and in order to avoid the problem of Call drop when a user moves from an LTE network to a UTRAN or GERAN network, the 3rd Generation Partner protocol (3 GPP) proposes a technical scheme for Voice Call Continuity (VCC). VCC refers to a scheme for smoothly switching Voice over IP (VoIP) services of a bearer source network to a CS domain of a target network, and is used to maintain continuity of the Voice services.

According to the number of different wireless signals simultaneously received by the UE, the VCC includes two modes, i.e., Dual Radio (DR) and Single Radio (SR), i.e., DRVCC and SRVCC. The SR refers to that the UE can only receive a radio signal of one carrier frequency at one time point. The application is applied to SRVCC scenes.

Fig. 1 is a diagram of a network system architecture for implementing SRVCC, as shown in fig. 1, the system includes: a source E-UTRAN, a source Mobile Management Entity (MME), an SRVCC Network Interworking Function (IWF), a target Mobile Switching Center (MSC), a target Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (UMTS) or Enhanced Data Rate GSM (Enhanced Data Rate for GSM Evolution) evolved Radio Access Network (GSM EDGE Radio Access Network, GERAN), and an IMS Network.

The source E-UTRAN is an access network part of the LTE network system and comprises an eNodeB and the like.

The MME is configured to perform a Packet Switch (PS) bearer partitioning function, distinguish a VoIP bearer from a non-VoIP bearer, initiate a handover to an SRVCC of a target cell, coordinate a synchronous execution of a PS handover and an SRVCC handover, and perform a non-voice bearer suspension and a non-voice bearer recovery.

SRVCC IWF, processing the voice service switching preparation request sent by MME through Sv interface, initiating the session switching from IMS domain to CS domain, and processing the CS switching and session switching flow. The MSC Server performs SRVCC IWF functions.

In addition to the conventional function, a Home Subscriber Server (HSS) in the SRVCC solution needs to store a Session Transfer Number Single-Radio (STN-SR) as a special parameter. In the UE attachment process, the HSS inserts the STN-SR parameter into the signed user data message and transmits the signed user data message to the MME, and then forwards the signed user data message to the MSC.

In the above, only a few main network elements in SRVCC are briefly described, and the SRVCC handover procedure is described below.

Based on the network system architecture diagram, when the UE moves from the LTE network to the 2G/3G network and reports a measurement report of an inter-system detection event to the E-UTRAN, SRVCC Handover (HO) is triggered. The SRVCC handover procedure includes:

(1) the UE sends a measurement report of the inter-system detection event to the source eNodeB. Wherein the inter-system detection events include B1 and B2 events. The B1 event is: measuring a Reference Signal Receiving Power (RSRP) value of a different Radio Access Type (RAT) cell; the reporting conditions of the event measurement report of B1 are as follows: the RSRP value of the inter-RAT cell is higher than the absolute threshold. The B2 event is: measuring RSRP values of a serving cell and a different RAT cell; the reporting conditions of the event measurement report of B2 are as follows: the RSRP value of the serving cell is lower than the absolute threshold 1 and the RSRP value of the neighbor cell is higher than the absolute threshold 2.

The different RAT cell refers to a neighboring cell which belongs to a different network type from the current serving cell of the UE.

(2) And the source eNodeB judges to initiate SRVCC handover to UTRAN/GERAN according to a handover judgment algorithm.

(3) And the source eNodeB sends a handover required to the source MME and identifies the handover as SRVCC.

(4) After receiving the handover requirement of SRVCC, the source MME separates the voice bearer (QCI ═ 1) from other PS bearers according to a QoS Class Identifier (QCI).

(5) The source MME then performs the PS-CS handover procedure. And the source MME selects a target SRVCC IWF (namely SRVCC IWF) according to the target ID carried in the handover required, and sends a PS-CS request to the SRVCC IWF. The PS-CS request includes information such as STN-SR, Mobile Subscriber Integrated Services Digital Network (ISDN/Public Switched Telephone Network (PSTN) number, MSISDN, and MME context.

(6) After receiving the PS-CS switching request, the SRVCC IWF sends a switching preparation request to the target MSC.

(7) The target MSC sends a redirection request to a Radio Network Subsystem (RNS), i.e. a target base station, of the target UTRAN/EGRAN, requesting allocation of CS Radio bearer resources.

(8) After the radio bearer resource is allocated, the target MSC sends a handover preparation response to the SRVCC IWF, and allocates a handover number.

(9) And the SRVCC IWF establishes circuit domain bearing connection with the target MSC by using the switching number.

(10) SRVCC IWF initiates the session transfer process, IMS network executes the session transfer process and updates the far end. After the session transfer process is completed, the IMS network sends a response message to the SRVCC IWF.

(11) The SRVCC IWF performs UE access. And the SRVCC IWF sends a PS-CS switching response to the source MME to indicate the UE to access. The MME sends a handover Command HO Command to the eNodeB.

The UE starts to try to access the CS network, and the target base station sends a redirection monitoring Detect message to the target MSC, which indicates that the UE has detected a new channel and has the condition of accessing the new wireless channel but has not really accessed the new channel. And after receiving the Relocation Detect message reported by the target base station, the target MSC sends a mapping processing access signaling MAPP ROCESS ACCESS SIGNALLINGIND message to the SRVCC IWF through the interoffice mapping MAP signaling. When the UE is successfully accessed to the CS network or the access is failed, the target base station sends a Relocation Complete message to the target MSC and informs the target MSC of the completion of the switching. And after receiving the reported Relocation Complete message, the target MSC sends a mapping sending end signaling MAP SEND END SIGNAL IND message to the SRVCC IWF through the inter-exchange MAP signaling.

(12) After receiving the response message and MAP SEND END SIGNAL IND (i.e., indicating the UE handover complete message) sent by the IMS network, the SRVCC IWF sends a PS-CS handover complete response to the source MME. SRVCC IWF sends PS-CS Complete Notification message SRVCC PS tocS Complete Notification message to source MME, and notifies the source MME that the handover is completed.

(13) The source MME releases the PS dedicated bearer. And after receiving the response message and the UE switching completion message sent by the IMS network, the SRVCC IWF sends a PS-CS completion notification message to the source MME. And after the MME receives the PS-CS completion notification message, releasing the PS special bearer of the UE in the IMS network. If the initial session transfer is successful and the UE access is successful, the SRVCC IWF can indicate the switching success through the PS-CS completion notification message; if the initial session transfer fails or the UE fails to access, the SRVCC IWF may indicate the handover failure through a PS-CS completion notification message.

In the SRVCC handover procedure, there is a handover failure, which results in a call failure of the ue. The inventor finds out through research that: under the weak LTE signal, the VoLTE call easily triggers the inter-system handover, namely the LTE is switched to 3G or 2G. Many network operators do not support pre-ringing Single standby Voice Call Continuity (SRVCC), but support ringing Single standby Voice Call Continuity (SRVCC in Alerting) and Enhanced Single Radio Voice Call Continuity (esvcc). If the ue reports a measurement report to the base station before receiving a 180Ring message (ringing message) in a call process, bSRVCC may occur, but since the ue or the network side device does not support bSRVCC, bSRVCC handover fails, and thus the call fails.

In the method, the user equipment sends the measurement report to the base station after the timer is overtime or receives a ringing message, namely, the measurement report is sent to the base station in a delayed manner, so that triggering of bSRVCC is avoided, and the triggering of other types of SRVCC is changed into triggering of SRVCC, such as aSRVCC switching, so that the success rate of SRVCC switching is improved, and the success rate of VoLTE calling under LTE weak signals is improved.

In order to facilitate understanding of those skilled in the art, the present application provides a specific implementation process of the technical solution provided by the present application through the following embodiments.

Fig. 2 is a schematic flow chart of the inter-system handover method of the present application, and as shown in fig. 2, the inter-system handover method of the present application includes step 202, in which a ue determines whether a condition for sending a request for triggering SRVCC handover to a base station is satisfied; step 204, the user equipment detects whether the user equipment and the internet protocol multimedia subsystem network equipment support bSRVCC; step 206, if the user equipment and/or the internet protocol multimedia subsystem network equipment do not support bSRVCC, when the condition of sending the SRVCC handover triggering request is satisfied, the user equipment sends the SRVCC handover triggering request to the base station after receiving the ringing message. Steps 202 and 204 are described below.

Step 202, the ue determines whether the condition for sending the SRVCC handover triggering request to the base station is satisfied.

In some embodiments, the request to trigger the SRVCC handover includes a measurement report of B1 and/or B2 events, the B1 and B2 events being inter-system detection events. Wherein, the B1 event is: measuring a Reference Signal Receiving Power (RSRP) value of a different Radio Access Type (RAT) cell; the reporting conditions of the event measurement report of B1 are as follows: the RSRP value of the inter-RAT cell is higher than the absolute threshold. The B2 event is: measuring RSRP values of a serving cell and a different RAT cell; the reporting conditions of the event measurement report of B2 are as follows: the RSRP value of the serving cell is lower than the absolute threshold 1 and the RSRP value of the neighbor cell is higher than the absolute threshold 2. In some embodiments, this step includes the ue determining whether the B1 and/or B2 events satisfy the conditions reported to the base station.

In some embodiments, this step further comprises the user equipment initiating a voice call.

In step 204, the user equipment detects whether the user equipment and the internet protocol multimedia subsystem network equipment support bSRVCC.

Wherein, the switching is bSRVCC if the 180Ring message is not received in the calling signaling; the 180Ring message is received in the calling signaling or the 180Ring message is sent by the called party, but the called party does not pick up the call, that is, the called party does not send 200ok, and the calling party does not receive 200ok, and the call is switched to the aSRVCC at this time, and the aSRVCC can occur at the calling side or the called side. The call is established and then the call is switched to eSRVCC. Many network operators do not support bsrvvcc, but support aSRVCC and eSRVCC.

In some embodiments, the user equipment detects whether the user equipment and the internet protocol multimedia subsystem network equipment support bSRVCC by: obtaining whether the user equipment supports bSRVCC from the configuration information of the user equipment, that is, whether the user equipment supports the switching before the ringing message is not received; the user equipment determines whether the IMS network device supports bSRVCC according to information returned to the user equipment by the IMS network device, for example, whether a network element in the IMS network supports bSRVCC may be included in information sent to the user equipment by the IMS network this time or before.

Step 206, if the user equipment and/or the internet protocol multimedia subsystem network equipment do not support bSRVCC, when the condition of sending the SRVCC handover triggering request is satisfied, the user equipment sends the SRVCC handover triggering request to the base station after receiving the ringing message.

In some embodiments, during a call of a user equipment, a trigger event of a B1 event or a B2 event is not controllable, bSRVCC may occur, aSRVCC may also occur, and the like. When at least one of the user equipment and the internet protocol multimedia subsystem network equipment does not support bSRVCC, if the bSRVCC occurs, the inter-system handover may fail, thereby causing a call failure. In order to avoid the failure of inter-system handover, the user equipment reports a measurement report to the base station after receiving the ringing message, because the handover of the user equipment after receiving the ringing message is not bSRVCC, the triggering of bSRVCC is avoided, and the handover is changed into the triggering of other types of SRVCC handover, such as aSRVCC or eSRVCC, so that the success rate of SRVCC handover is improved, and the success rate of VoLTE calling under LTE weak signals is improved.

In some embodiments, the user equipment reports a measurement report of the B1 or B2 event to the base station for triggering the base station to initiate the SRVCC handover. Optionally, before reporting the measurement report to the base station, the method further includes: the user equipment receives a request message of the inter-system detection event sent by the base station.

In the method, the user equipment sends the measurement report to the base station after receiving the ringing message, so that triggering of bSRVCC is avoided, and other types of SRVCC switching, such as aSRVCC or eSRVCC, are triggered, and the success rate of SRVCC switching and the call success rate of the user equipment are improved.

Fig. 3 is a flowchart illustrating a second method for inter-system handover according to the present application, and as shown in fig. 3, the method for inter-system handover according to the present application includes step 202, in which the ue determines whether a condition for sending a request for triggering SRVCC handover to the base station is satisfied; step 204, the user equipment detects whether the user equipment and the internet protocol multimedia subsystem network equipment support bSRVCC; step 206A, if the user equipment and/or the Internet protocol multimedia subsystem network equipment do not support bSRVCC, when the condition of sending the SRVCC switching request is satisfied, the user equipment sends the SRVCC switching request to the base station after receiving the ringing message; or after the preset timer is overtime, the user equipment sends a request for triggering the SRVCC switching to the base station. Step 202-206A is described below.

This step is already described above and will not be described here.

Step 206A, if the user equipment and/or the Internet protocol multimedia subsystem network equipment do not support bSRVCC, when the condition of sending the SRVCC switching request is satisfied, the user equipment sends the SRVCC switching request to the base station after receiving the ringing message; or after the preset timer is overtime, the user equipment sends a request for triggering the SRVCC switching to the base station.

In some embodiments, this step is preceded or further includes setting a timer, and the time setting of the timer can be adjusted according to the current network test as long as the 180Ring message is received by the ue and then the measurement report is sent. That is to say, the time setting of the timer is adjusted according to the current network test, and the timer can meet the requirement that the user equipment has received 180Ring messages after the timer is overtime, so that the user equipment reports a measurement report to the base station after the timer is overtime, that is, the measurement report is sent in a delayed manner, and thus the triggering of bSRVCC can be avoided and converted into triggering of other types of SRVCC handover, such as aSRVCC, so that the success rate of SRVCC handover is improved, and the success rate of VoLTE calling under the LTE weak signal is improved. In this embodiment, when the timer is overtime or the ue has received the ringing message, the ue sends a request for triggering SRVCC handover to the base station, that is, reports a measurement report to the base station, so as to trigger the base station to initiate SRVCC handover.

In some embodiments, step 206A further comprises the user equipment stopping the timer after receiving the ringing message to conserve system resources of the user equipment.

Fig. 4 is a third flowchart illustrating a method for inter-system handover according to the present application, and as shown in fig. 4, the method for inter-system handover according to the present application includes step 202, in which the ue determines whether a condition for sending a request for triggering SRVCC handover to the base station is satisfied; step 204, the user equipment detects whether the user equipment and the internet protocol multimedia subsystem network equipment support bSRVCC; step 206B, if the user equipment and/or the Internet protocol multimedia subsystem network equipment do not support bSRVCC, when the condition of sending the SRVCC switching request is satisfied, the user equipment sends the SRVCC switching request to the base station after receiving the ringing message; or after the preset first timer is overtime, the user equipment detects whether the ringing message is received, if the ringing message is not received, after the preset second timer is overtime, the user equipment sends a request for triggering SRVCC switching to the base station. Steps 202-206B are described below.

This step is already described above and will not be described here.

Step 206B, if the user equipment and/or the Internet protocol multimedia subsystem network equipment do not support bSRVCC, when the condition of sending the SRVCC switching request is satisfied, the user equipment sends the SRVCC switching request to the base station after receiving the ringing message; or after the preset first timer is overtime, the user equipment detects whether the ringing message is received, if the ringing message is not received, after the preset second timer is overtime, the user equipment sends a request for triggering SRVCC switching to the base station.

In some embodiments, this step is preceded or further includes setting a timer, and the time setting of the timer can be adjusted according to the current network test as long as the 180Ring message is received by the ue and then the measurement report is sent. In the step, the measurement report is reported in a delayed manner through a timer, so that the user equipment sends the measurement report after receiving the ringing message, the step comprises two timers, when the first timer is overtime, the user equipment detects whether the ringing message is received, if the ringing message is not received, the second timer is started, and after the second timer is overtime, the user equipment reports the measurement report to the base station. The first timer and the second timer can set different timing time, and the user equipment can receive 180Ring messages after the second timer is overtime more easily through the combination of the first timer and the second timer, so that the control is simpler, more convenient, more flexible and more accurate. Optionally, the timing time of the first timer is longer than the timing time of the second timer, so that the second timer can perform fine adjustment of the delay time, and it is more accurate and easier to implement that the user equipment has received the 180Ring message after the timer times out.

The following describes an interaction procedure between a UE and an eNodeB in the present application, and as shown in fig. 5, the interaction procedure includes:

301, UE receives a request message of inter-system detection event sent by eNodeB;

the UE judges whether the condition of sending a request for triggering SRVCC switching to a base station is met or not;

303. detecting whether user equipment and internet protocol multimedia subsystem network equipment support bSRVCC; if so, the UE reports a measurement report to the eNodeB; if not, go to step 304;

304. after receiving the ringing message or the overtime of the timer, the UE reports a measurement report to the base station for triggering the base station to initiate SRVCC switching;

and 305, the eNodeB initiates the SRVCC handover and executes the SRVCC handover process.

In this embodiment, the ue reports the measurement report to the base station after the timer expires or receives a ringing message, so as to avoid triggering of bSRVCC, and convert the bSRVCC into triggering of other types of SRVCC handover, such as aSRVCC, thereby improving the success rate of SRVCC handover and improving the call success rate of VoLTE under LTE weak signals.

Fig. 6 is a schematic structural diagram of a user equipment according to the present application, and as shown in fig. 6, a user equipment 10 includes: a judging unit 11, where the judging unit 11 is configured to judge whether a condition for sending a request for triggering SRVCC handover to a base station is satisfied; a detecting unit 12, wherein the detecting unit 12 is configured to detect whether the user equipment and the internet protocol multimedia subsystem network equipment support bSRVCC; a sending unit 13, where the sending unit 13 is configured to, if the user equipment and/or the internet protocol multimedia subsystem network device do not support bSRVCC, send a request for triggering SRVCC handover to the base station after the user equipment receives the ringing message when a condition for sending a request for triggering SRVCC handover is satisfied.

Optionally, the sending unit 13 is further configured to: if the user equipment and/or the internet protocol multimedia subsystem network equipment do not support bSRVCC, after the preset timer is overtime, the user equipment sends a request for triggering SRVCC handover to the base station.

Optionally, the sending unit 13 is further configured to; if the user equipment and/or the internet protocol multimedia subsystem network equipment do not support bSRVCC, after the preset first timer is overtime, the user equipment detects whether a ringing message is received, if the ringing message is not received, after the preset second timer is overtime, the user equipment sends a request for triggering SRVCC switching to the base station.

Optionally, the timing time of the first timer is greater than the timing time of the second timer.

Optionally, the sending unit 13 is further configured to: the timer is stopped after the user equipment receives the ringing message.

Optionally, the detection unit 12 is configured to: obtaining whether the user equipment supports bSRVCC from the configuration information of the user equipment; and determining whether the Internet protocol multimedia subsystem network equipment supports bSRVCC according to the information returned to the user equipment by the Internet protocol multimedia subsystem network equipment.

Optionally, the determining unit 11 is configured to determine whether the event B1 and/or the event B2 meet the condition reported to the base station.

Optionally, the request to trigger the SRVCC handover includes a measurement report of a B1 and/or B2 event.

In this specification, for the ue embodiment, since it is basically similar to the inter-system handover method embodiment, please refer to the description of the inter-system handover method embodiment for relevant points.

The embodiment provides a user equipment, which sends a request for triggering SRVCC handover to a base station after a timer expires or a ringing message is received, that is, a measurement report is reported to the base station, so as to avoid triggering of bSRVCC, and convert the bSRVCC into triggering of other types of SRVCC handover, such as aSRVCC, thereby improving a success rate of SRVCC handover and improving a call success rate of VoLTE under an LTE weak signal.

Fig. 7 is a schematic structural diagram of a user equipment according to the present application, and as shown in fig. 7, the user equipment 25 includes a processor 20, a memory 21, a transmitter 23, and a receiver 22, and the processor 20, the memory 21, the transmitter 23, and the receiver 22 communicate with each other through a bus 24.

In some embodiments, the processor 20 may be a single or multi-core central processing unit, or a specific integrated circuit, or configured to implement one or more integrated circuits of the present application. The Memory 21 may be a Random Access Memory (RAM) or a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. Memory 21 is used to store computer instructions 211, which computer instructions 211 may include program code.

In some embodiments, the receiver 22 is configured to receive an inter-system detection event request message sent by the base station eNodeB. The processor 20 is configured to determine whether a condition for sending a request for triggering SRVCC handover to a base station is satisfied; detecting whether user equipment and internet protocol multimedia subsystem network equipment support bSRVCC; the transmitter 23 is configured to, if the user equipment and/or the internet protocol multimedia subsystem network equipment do not support bSRVCC, send a request for triggering SRVCC handover to the base station after the user equipment receives the ringing message when a condition for sending the request for triggering SRVCC handover is satisfied.

Optionally, the transmitter 23 is further configured to: if the user equipment and/or the internet protocol multimedia subsystem network equipment do not support bSRVCC, after the preset timer is overtime, the user equipment sends a request for triggering SRVCC handover to the base station.

Optionally, the transmitter 23 is further configured to: if the user equipment and/or the internet protocol multimedia subsystem network equipment do not support bSRVCC, after the preset first timer is overtime, the user equipment detects whether a ringing message is received, if the ringing message is not received, after the preset second timer is overtime, the user equipment sends a request for triggering SRVCC switching to the base station.

Optionally, the transmitter 23 is further configured to: the timer is stopped after the user equipment receives the ringing message. In other embodiments, processor 20 may also stop the timer after the user equipment receives the ringing message.

Optionally, the processor 20 is further configured to: obtaining whether the user equipment supports bSRVCC from the configuration information of the user equipment; and determining whether the Internet protocol multimedia subsystem network equipment supports bSRVCC according to the information returned to the user equipment by the Internet protocol multimedia subsystem network equipment.

Optionally, the processor 20 is configured to: and judging whether the events B1 and/or B2 meet the condition of reporting to the base station.

The user equipment provided by the embodiment reports the measurement report to the base station after the timer is overtime or receives a ringing message, so that triggering of bSRVCC is avoided, and other types of SRVCC handover, such as aSRVCC, are triggered, the success rate of SRVCC handover is improved, and the call success rate of VoLTE under an LTE weak signal is improved.

It is clear to a person skilled in the art that the solution of the present application can be implemented by means of software and/or hardware. The "unit" and "module" in this specification refer to software and/or hardware that can perform a specific function independently or in cooperation with other components, where the hardware may be, for example, an FPGA (Field-Programmable Gate Array), an IC (Integrated Circuit), or the like.

The processing units and/or modules of the present application may be implemented by analog circuits that perform the functions described herein, or may be implemented by software that performs the functions described herein.

The application also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor implements the steps of the inter-system switching method when executing the program.

The present application also provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the inter-system handover method described above. The computer-readable storage medium may include, but is not limited to, any type of disk including floppy disks, optical disks, DVD, CD-ROMs, microdrive, and magneto-optical disks, ROMs, RAMs, EPROMs, EEPROMs, DRAMs, VRAMs, flash memory devices, magnetic or optical cards, nanosystems (including molecular memory ICs), or any type of media or device suitable for storing instructions and/or data.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.

All functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately used as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for inter-system handover, comprising:

the user equipment judges whether the condition of sending a request for triggering SRVCC switching to a base station is met;

detecting whether the user equipment and internet protocol multimedia subsystem network equipment support bSRVCC;

if the user equipment and/or the internet protocol multimedia subsystem network equipment do not support bSRVCC, when the condition of sending the SRVCC switching triggering request is met, the user equipment sends the SRVCC switching triggering request to the base station after receiving the ringing message;

if the user equipment and/or the internet protocol multimedia subsystem network equipment do not support bSRVCC, after a preset first timer is overtime, the user equipment detects whether a ringing message is received, if the ringing message is not received, after a preset second timer is overtime, the user equipment receives the ringing message, and the user equipment sends a request for triggering SRVCC switching to the base station; the timing time of the first timer is greater than the timing time of the second timer.

2. The inter-system handover method according to claim 1, further comprising:

and if the user equipment and/or the Internet protocol multimedia subsystem network equipment do not support bSRVCC, after a preset timer is overtime, the user equipment sends a request for triggering SRVCC switching to the base station.

3. The inter-system handover method according to claim 1 or 2, further comprising: and the user equipment stops the timer after receiving the ringing message.

4. The inter-system handover method according to claim 1 or 2, wherein detecting whether the user equipment and an internet protocol multimedia subsystem network device support bSRVCC comprises:

obtaining whether the user equipment supports bSRVCC from the configuration information of the user equipment;

and acquiring whether the Internet protocol multimedia subsystem network equipment supports bSRVCC according to the information returned to the user equipment by the Internet protocol multimedia subsystem network equipment.

5. The inter-system handover method according to claim 1 or 2, wherein the determining, by the ue, whether the condition for sending the SRVCC handover triggering request to the base station is satisfied comprises:

and the UE judges whether the events B1 and/or B2 meet the conditions reported to the base station.

6. The inter-system handover method according to claim 1 or 2, wherein the request for triggering SRVCC handover comprises a measurement report of B1 and/or B2 events.

7. A user equipment, the user equipment comprising:

a judging unit, configured to judge whether a condition for sending a request for triggering SRVCC handover to a base station is satisfied;

a detecting unit, configured to detect whether the user equipment and an internet protocol multimedia subsystem network device support bSRVCC;

a sending unit, configured to send, if the ue and/or the internet protocol multimedia subsystem network device do not support bSRVCC, a request for triggering SRVCC handover to the base station after the ue receives a ringing message when a condition for sending the request for triggering SRVCC handover is satisfied;

the sending unit is further configured to: if the user equipment and/or the internet protocol multimedia subsystem network equipment do not support bSRVCC, after a preset first timer is overtime, the user equipment detects whether a ringing message is received, if the ringing message is not received, after a preset second timer is overtime, the user equipment receives the ringing message, and the user equipment sends a request for triggering SRVCC switching to the base station; the timing time of the first timer is greater than the timing time of the second timer.

8. The UE of claim 7, wherein the sending unit is further configured to:

9. The UE of claim 7 or 8, wherein the sending unit is further configured to: and stopping the timer after the user equipment receives the ringing message.

10. The UE of claim 7 or 8, wherein the detecting unit is configured to:

11. The UE of claim 7 or 8, wherein the determining unit is configured to: and judging whether the events B1 and/or B2 meet the condition reported to the base station.

12. The user equipment according to claim 7 or 8, wherein the request for triggering the SRVCC handover comprises a measurement report of a B1 and/or B2 event.

13. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.

14. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method of any of claims 1-6 are implemented when the program is executed by the processor.