CN110324823B - CSFB calling method and system - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
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Abstract
The invention discloses a CSFB calling method, when a CSFB call of a mobile terminal is finished, an MSC processes an SGs interface according to a network where the mobile terminal is located: when the mobile terminal returns to the 4G network, the SGs interface is kept in an activated state; when the mobile terminal resides in the 2/3G network, the SGs interface is suspended; when the mobile terminal has incoming call paging, the MSC pages according to the state of the SGs interface. Correspondingly, a CSFB call system is also disclosed. The method and the system can realize that when the mobile terminal fails to return to the 4G network from the 2/3G network and the resident cell is the same as the fallen cell, the mobile terminal can still be paged, thereby avoiding the situation of call failure.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a CSFB call method and system.
Background
Currently, in a 4G network, when performing a voice call service, a Circuit Switch Fall Back (CSFB) technology is usually adopted to drop a 4G (4th Generation) voice call service Back to a 2G (2nd Generation) network or a 3G (3rd Generation) network, and the voice service is provided through an 2/3G network; when the voice call is finished, the call needs to be returned to the 4G network from the 2/3G network.
If the return fails, the mobile terminal resides in the 2/3G network, and the resident cell is the same as the fallen cell, the location area updating process cannot be performed, the MSC cannot sense that the mobile terminal returns to the 4G network failure, the SGs interface activation state is still maintained, when the mobile terminal has an incoming call, the MSC still sends a paging request to the MME, and at the moment, the mobile terminal resides in the 2/3G network, cannot receive the paging request of the MME, and cannot establish a call, so that the call failure is caused.
Disclosure of Invention
The present invention provides a CSFB call method and system to solve the above-mentioned problem in the prior art, and is used to solve the problem in the prior art that a mobile terminal fails to return to a 4G network from an 2/3G network, and when a camped cell is the same as a fallback cell, an MSC still maintains an SGs interface activated state, and when the mobile terminal has an incoming call, the MSC sends a paging request to an MME, and at this time, the mobile terminal is camped on a 2G/3G network and cannot receive the paging request of the MME, which results in a call failure.
In order to solve the above technical problem, the present invention provides a CSFB call method, including:
after the mobile terminal CSFB call is finished, the MSC processes the SGs interface according to the network where the mobile terminal is located: when the mobile terminal returns to the 4G network, the SGs interface is kept in an activated state; when the mobile terminal resides in the 2/3G network, the SGs interface is suspended;
when the mobile terminal has incoming call paging, the MSC pages according to the state of the SGs interface.
Preferably, the MSC processing the SGs interface according to the network where the mobile terminal is located specifically includes:
after the CSFB call of the mobile terminal is finished, the MSC starts timing;
before the preset time length is reached, MSC receives the position updating information about the mobile terminal sent by MME, and then MSC keeps the SGs interface in an activated state;
receiving a LAU (Location Area Update) message sent by the mobile terminal before the preset time length arrives, or not receiving a Location Update message about the mobile terminal sent by the MME when the preset time length arrives, and suspending the SGs interface by the MSC.
Preferably, the paging performed by the MSC according to the state of the SGs interface specifically includes:
when the SGs interface is in an activated state, the MSC sends paging request information to the MME;
when the SGs interface is in a suspended state, the MSC directly pages in the LAI of the mobile terminal.
Preferably, the preset time length is greater than the CSFB fallback time length of the mobile terminal.
Correspondingly, the invention also provides a CSFB call system, which comprises an MSC, an MME and a mobile terminal,
the MSC is used for processing the SGs interface according to the network of the mobile terminal after the CSFB call of the mobile terminal is finished: when the mobile terminal returns to the 4G network, keeping the SGs interface in an activated state; suspending the SGs interface when the mobile terminal is acquired to reside in the 2/3G network;
the MSC is also used for paging the mobile terminal according to the state of the SGs interface when the mobile terminal has incoming call paging.
Preferably, the MSC comprises a timer and a processing module, the timer is provided with a preset duration,
the timer is used for starting timing after the CSFB call of the mobile terminal is finished and sending a signal to the processing module when a preset time length is reached;
the processing module is used for keeping the SGs interface in an activated state according to the received mobile terminal position updating message sent by the MME when the signal sent by the timer is not received; alternatively, the first and second electrodes may be,
the SGs interface is used for suspending the SGs interface according to the received LAU message sent by the mobile terminal; or, when the signal sent by the timer is received, according to that the mobile terminal location update message sent by the MME is not received, suspending the SGs interface.
Preferably, the MSC further includes a paging module, configured to perform paging according to a state of the SGs interface when the mobile terminal has an incoming call: and sending paging request information to the MME when the SGs interface is in an activated state, and paging in the LAI of the mobile terminal when the SGs interface is in a suspended state.
Preferably, the preset duration of the timer is greater than the CSFB fallback duration of the mobile terminal.
The beneficial technical effects of the invention are as follows: in the CSFB call method and system of the invention, after the CSFB call of the mobile terminal is finished, the MSC processes the SGs interface according to the network where the mobile terminal is located: when the mobile terminal returns to the 4G network, the SGs interface is kept in an activated state; when the mobile terminal resides in the 2/3G network, the SGs interface is suspended; when the mobile terminal has incoming call paging, the MSC pages according to the state of the SGs interface.
Specifically, after a CSFB call of a mobile terminal is finished, timing is started, if an MSC receives a mobile terminal position updating message sent by an MME before a preset time length is reached, the MSC keeps an SGs interface in an activated state, and when an incoming call is paged, the MSC sends paging request information to the MME; if the LAU message sent by the mobile terminal is received before the preset time length is reached, or if the mobile terminal position updating message sent by the MME is still not received when the preset time length is reached, the MSC suspends the SGs interface, and when an incoming call is paged, the MSC pages in the LAI of the mobile terminal, so that the mobile terminal can still be paged when the resident cell is the same as the fallen cell, and the condition of call failure is avoided.
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Fig. 1 is a flow chart of a CSFB call method according to embodiment 1 of the present invention;
fig. 2 is a flow chart of a CSFB call method according to embodiment 2 of the present invention;
fig. 3 is a schematic structural diagram of a CSFB call system according to embodiment 4 of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the CSFB call method and system of the present invention are further described in detail below with reference to the accompanying drawings and embodiments.
Example 1:
as shown in fig. 1, the present embodiment provides a CSFB call method, including:
after the mobile terminal CSFB call is finished, the MSC processes the SGs interface according to the network where the mobile terminal is located: when the mobile terminal returns to the 4G network, the SGs interface is kept in an activated state; when the mobile terminal resides in the 2/3G network, the SGs interface is suspended;
when the mobile terminal has incoming call paging, the MSC pages according to the state of the SGs interface.
Example 2:
as shown in fig. 1 and 2, the present embodiment discloses a CSFB call method, in which a mobile terminal has a 4G multimode card, and the 4G multimode card selects a CSFB technique to implement a voice call.
The method comprises the following steps:
the joint attachment process is specifically that the 4G multi-mode card of the mobile terminal sends an Attach Request message to the MME, wherein the parameter Attach Type indicates that the mobile terminal is a joint EPS/IMSI attachment process, and the parameter indicates that the mobile terminal has CS Fallback capability, the MME sends an SGsAP-LOCATION-UPDATE-Request message to a corresponding VLR, the message comprises parameters such as new LAI, IMSI, MME name and LOCATION UPDATE Type of the 4G multi-mode card, the VLR stores MME information and creates SGs association with the 4G multi-mode card under the MME, the VLR initiates a 4G multi-mode card LOCATION UPDATE process to the HLR according to user information and LOCATION area information, the VLR returns confirmation information to the MME, and the MME sends an Attach Accept message to the mobile terminal to complete joint attachment.
the called signaling flow is specifically that a calling MSC sends a calling request to an attached MSC of a mobile terminal, the called MSC sends a paging request to an MME, the MME sends the paging request to the mobile terminal, the mobile terminal receives the paging request sent by the MME and sends an extended service request to the MME, the MME sends a mobile terminal fallback cell indication to an eNB, the eNB sends the configured fallback cell information to the mobile terminal, the mobile terminal performs fallback cell measurement and sends a measurement result to the eNB, the eNB determines a proper fallback cell and then sends the information to the mobile terminal, and the mobile terminal falls back to the proper cell. It should be noted that, when the dropped cell is consistent with the cell identifier during the joint attachment, the mobile terminal does not need to perform location update, and at this time, the MSC does not delete the SGs interface association relationship of the mobile terminal. The mobile terminal sends paging response information to the MSC to establish a call.
In step 102 in this embodiment, the method is not only applicable to the mobile terminal being a called party, but also applicable to the mobile terminal being a calling party, and the CSFB calling signaling procedure is not described herein again.
After the conversation is finished, the mobile terminal returns two conditions whether the 4G network is successful or not: if the mobile terminal sends out the joint location update after successfully returning to the 4G network from the 2/3G network, and the MSC receives the information about the location update of the mobile terminal sent by the MME, the MSC can perceive that the mobile terminal successfully returns to the 4G network.
If the mobile terminal fails to return to the 4G network from the 2/3G network, the mobile terminal resides in the 2/3G network, when the resident cell is the same as the fallen cell, the mobile terminal does not perform the location area updating process, and when the resident cell is different from the fallen cell, the mobile terminal performs the location area updating process.
specifically, after the CSFB call of the mobile terminal ends, the MSC starts timing;
before the preset time length is reached, MSC receives the position updating information about the mobile terminal sent by MME, and then MSC keeps the SGs interface in an activated state;
and receiving LAU information sent by the mobile terminal before the preset time length is reached, or not receiving the position updating information about the mobile terminal sent by the MME when the preset time length is reached, and suspending the SGs interface by the MSC.
And the preset time length is greater than the CSFB fallback time length of the mobile terminal.
In this embodiment, the MSC starts timing after the CSFB call of the mobile terminal is ended, and quickly determines whether the mobile terminal has returned from the 2/3G network to the 4G network successfully or not within a preset time period as much as possible by setting the preset time period, and then processes the SGs interface according to the network where the mobile terminal is located. It is theorized that the time for the mobile terminal to return from the 2/3G network to the 4G network should be equal to the CSFB fall-back time, so the MSC starts timing after the mobile terminal CSFB call is ended, and the preset time is slightly longer than the CSFB fall-back time. Since the CSFB fall-back time is generally several tens of seconds, the preset time is preferably 1 minute.
In this embodiment, if the MSC receives a location update message about the mobile terminal sent by the MME before the preset duration arrives, it indicates that the mobile terminal successfully returns to the 4G network after the call is ended, and the MSC keeps the SGs interface in the active state. If the MSC receives the LAU message sent by the mobile terminal before the preset time length is reached, the mobile terminal is not successfully returned to the 4G network after the call is finished, and the resident cell is different from the dropped cell, and the MSC suspends the SGs interface. If the mobile terminal position updating message sent by the MME is not received when the preset time length is reached, the mobile terminal is not successfully returned to the 4G network after the conversation is finished, and the resident cell is the same as the dropped cell, the MSC suspends the SGs interface. It should be noted that, suspending the SGs interface in the present invention may also be understood as closing the SGs interface.
104, when the mobile terminal has incoming call paging, the MSC pages according to the state of the SGs interface;
specifically, when the SGs interface is in an active state, the MSC sends paging request information to the MME; when the SGs interface is in a suspended state, the MSC directly pages in the LAI of the mobile terminal.
In this embodiment, when the mobile terminal has an incoming call, the MSC first determines the state of the SGs interface, and when the SGs interface is in an active state, sends paging request information to the MME; and when the SGs interface is in a suspended state, directly paging in the LAI of the mobile terminal.
And 105, the mobile terminal returns a paging response after receiving the paging message and establishes a call.
In the CSFB call method provided in embodiments 1 and 2, after a CSFB call of a mobile terminal is ended, an MSC starts timing, where a preset time length is slightly longer than a CSFB fallback time length, and if the MSC receives a mobile terminal location update message sent by an MME before the preset time length arrives, indicating that the mobile terminal is in a 4G network, the MSC keeps an SGs interface in an active state, and when there is an incoming call, the MSC sends a paging request message to the MME; if the LAU message sent by the mobile terminal is received before the preset time length is reached, or the mobile terminal location updating message sent by the MME is not received when the preset time length is reached, which indicates that the mobile terminal is resident in the 2/3G network, the MSC suspends the SGs interface, and when an incoming call is paged, the MSC pages in the LAI of the mobile terminal, so that the mobile terminal can be quickly paged when the resident cell is the same as the dropped cell, and the condition of call failure is avoided.
When the resident cell is the same as the fallback cell, the preset time interval in the invention is shorter than the time interval for requesting TAU (Tracking Area Update) by the mobile terminal itself in the prior art, because the default time interval of TAU is 54 minutes, and the preset time interval of the invention is slightly longer than the CSFB fallback time interval, the invention can significantly reduce the probability of call failure.
In addition, in the prior art, when there is an incoming call, the MSC first pages in the 2/3G network, and determines whether the mobile terminal returns to the 4G network during the paging process, and if the determination result is yes, sends a paging request to the MME. When the mobile terminal successfully returns to the 4G network after the CSFB voice call is finished, the method can finish the processing of the interface within the preset time length after the call is finished, and can quickly page the corresponding network when the incoming call is paged again, thereby reducing the load of a base station and a wireless interface in the 2/3G network compared with the prior art and saving resources.
Example 3:
the embodiment provides a CSFB calling system, which comprises an MSC, an MME and a mobile terminal,
the MSC is used for processing the SGs interface according to the network of the mobile terminal after the CSFB call of the mobile terminal is finished: when the mobile terminal returns to the 4G network, keeping the SGs interface in an activated state; suspending the SGs interface when the mobile terminal is acquired to reside in the 2/3G network;
the MSC is also used for paging the mobile terminal according to the state of the SGs interface when the mobile terminal has incoming call paging.
Example 4:
as shown in fig. 3, the present embodiment discloses a CSFB call system, which includes a mobile terminal, wherein the mobile terminal has a 4G multimode card, and the 4G multimode card selects a CSFB technique to implement a voice call.
In this embodiment, the mobile terminal may be used as a calling party to execute a CSFB calling signaling procedure to establish a call, and may also be used as a called party to execute a CSFB called signaling procedure to establish a call.
It should be noted that, after the call is ended, the mobile terminal returns to the 4G network whether the two situations exist successfully or not: if the mobile terminal successfully returns to the 4G network from the 2/3G network, a joint location update request is sent, and the MSC receives a joint location update message sent by the MME and senses that the mobile terminal successfully returns to the 4G network.
If the mobile terminal fails to return to the 4G network from the 2G/3G network, the mobile terminal resides in the 2G/3G network, when the resident cell is the same as the fallen cell, the mobile terminal does not perform the location area updating process, and when the resident cell is different from the fallen cell, the mobile terminal performs the location area updating process.
The system also comprises an MSC and an MME,
the MSC is used for processing the SGs interface according to the network of the mobile terminal after the CSFB call of the mobile terminal is finished: when the mobile terminal returns to the 4G network, keeping the SGs interface in an activated state; suspending the SGs interface when the mobile terminal is acquired to reside in the 2/3G network;
specifically, the MSC includes a timer 11 and a processing module 12,
the timer 11 is configured to start timing after the mobile terminal CSFB call is ended, and a preset time length is set in the timer 11, where the preset time length is greater than a mobile terminal CSFB fall-back time length, and is configured to send a signal to the processing module 12 when the preset time length is reached.
In this embodiment, it is theoretically inferred that the time when the mobile terminal returns from the 2/3G network to the 4G network should be equal to the CSFB fallback duration, so the timer 11 is configured to start timing according to the obtained CSFB call end message, and the preset duration of the timer 11 is slightly longer than the CSFB fallback duration. In particular, the preset time period of the timer 11 is preferably 1 minute. When the preset time length of 1 minute is reached, the timer 11 is used for sending a signal to the processing module 12.
A processing module 12, configured to, when a signal sent by the timer 11 is not received, maintain the SGs interface in an active state according to a received mobile terminal location update message sent by the MME; or, according to the received LAU message sent by the mobile terminal, suspending the SGs interface; or when the signal sent by the timer is received, according to the fact that the mobile terminal position updating message sent by the MME is not received, the SGs interface is suspended.
In this embodiment, the processing module 12 is electrically connected to the timer 11, the MME, and the mobile terminal, and when the processing module 12 does not receive the signal sent by the timer 11 and receives a location update message about the mobile terminal sent by the MME, it indicates that the mobile terminal successfully returns to the 4G network after the call is ended, and the processing module 12 is configured to keep the SGs interface in an activated state; when the processing module 12 does not receive the signal sent by the timer 11 and receives the LAU message sent by the mobile terminal, it indicates that the mobile terminal does not successfully return to the 4G network after the call is ended, and the resident cell is different from the dropped cell, the processing module 12 is configured to suspend the SGs interface; when the processing module 12 receives the signal sent by the timer 11 and does not receive the location update message of the mobile terminal sent by the MME, it indicates that the mobile terminal does not successfully return to the 4G network after the call is ended, and the resident cell is the same as the dropped cell, and the processing module 12 is configured to suspend the SGs interface.
The MSC is also used for paging the mobile terminal according to the state of the SGs interface when the mobile terminal has incoming call paging.
Specifically, the MSC further includes a paging module 13, configured to perform paging according to a state of the SGs interface when the mobile terminal has an incoming call: when the SGs interface is in an activated state, sending paging request information to the MME; paging is performed in the LAI of the mobile terminal when the SGs interface is in a suspended state.
In this embodiment, the paging module 13 is configured to determine the state of the SGs interface to perform paging according to the obtained message that the mobile terminal has incoming call paging: when the SGs interface is in an active state, the paging module 13 is configured to send paging request information to the MME; when the SGs interface is in the suspend state, the paging module 13 is configured to page in the LAI of the mobile terminal.
In the CSFB call systems provided in embodiments 3 and 4, the MSC includes a timer 11, a processing module 12, and a paging module 13, and the timer 11 is configured to start timing after the CSFB call of the mobile terminal is ended. A processing module 12, configured to, when a signal sent by the timer is not received, maintain the SGs interface in an active state according to a received mobile terminal location update message sent by the MME; or, the SGs interface is suspended according to the received LAU message sent by the mobile terminal; or, when the signal sent by the timer is received, according to that the mobile terminal location update message sent by the MME is not received, suspending the SGs interface. The paging module 13 is configured to determine a state of the SGs interface according to a message that the mobile terminal has an incoming call page, and perform paging: when the SGs interface is in an activated state, sending paging request information to the MME; paging is performed in the LAI of the mobile terminal when the SGs interface is in a suspended state. Therefore, when the resident cell is the same as the dropped cell, the mobile terminal can still be paged quickly, and the condition of call failure is avoided.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (6)
1. A CSFB call method, comprising the steps of:
after the mobile terminal CSFB call is finished, the MSC processes the SGs interface according to the network where the mobile terminal is located: when the mobile terminal returns to the 4G network, the SGs interface is kept in an activated state; when the mobile terminal resides in the 2/3G network, the SGs interface is suspended;
when the mobile terminal has incoming call paging, MSC pages according to the state of SGs interface,
the MSC processing the SGs interface according to the network where the mobile terminal is located specifically includes:
after the CSFB call of the mobile terminal is finished, the MSC starts timing;
before the preset time length is reached, MSC receives the position updating information about the mobile terminal sent by MME, and then MSC keeps the SGs interface in an activated state;
and receiving LAU information sent by the mobile terminal before the preset time length is reached, or not receiving the position updating information about the mobile terminal sent by the MME when the preset time length is reached, and suspending the SGs interface by the MSC.
2. The CSFB call method of claim 1, wherein the paging by the MSC according to the state of the SGs interface specifically comprises:
when the SGs interface is in an activated state, the MSC sends paging request information to the MME;
when the SGs interface is in a suspended state, the MSC directly pages in the LAI of the mobile terminal.
3. The CSFB call method of claim 1 or 2, wherein the preset duration is greater than a mobile terminal CSFB fallback duration.
4. A CSFB call system is characterized in that the CSFB call system comprises an MSC, an MME and a mobile terminal,
the MSC is used for processing the SGs interface according to the network of the mobile terminal after the CSFB call of the mobile terminal is finished: when the mobile terminal returns to the 4G network, keeping the SGs interface in an activated state; suspending the SGs interface when the mobile terminal is acquired to reside in the 2/3G network;
the MSC is also configured to page the mobile terminal when it has an incoming call based on the state of the SGs interface,
the MSC comprises a timer and a processing module, wherein the timer is internally provided with a preset time length,
the timer is used for starting timing after the CSFB call of the mobile terminal is finished and sending a signal to the processing module when a preset time length is reached;
the processing module is used for keeping the SGs interface in an activated state according to the received mobile terminal position updating message sent by the MME when the signal sent by the timer is not received; alternatively, the first and second electrodes may be,
the SGs interface is suspended according to the received LAU message sent by the mobile terminal; or, the mobile terminal is configured to suspend the SGs interface according to that the mobile terminal location update message sent by the MME is not received when receiving the signal sent by the timer.
5. The CSFB call system of claim 4, wherein the MSC further comprises a paging module configured to page according to a status of the SGs interface when the mobile terminal is paged by an incoming call: and sending paging request information to the MME when the SGs interface is in an activated state, and paging in the LAI of the mobile terminal when the SGs interface is in a suspended state.
6. The CSFB call system of any of claims 4-5, wherein the preset duration is greater than a mobile terminal CSFB fall back duration.
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| CN111818602B (en) * | 2020-07-13 | 2023-03-10 | 中国联合网络通信集团有限公司 | CSFB calling method, mobile management entity, service gateway and system |
| CN111918391B (en) * | 2020-09-08 | 2023-03-14 | 中国联合网络通信集团有限公司 | Paging processing method, evolved node B and mobile terminal |
| CN112714457B (en) * | 2021-02-20 | 2023-03-21 | 中国联合网络通信集团有限公司 | Coverage quality evaluation method, device, equipment and computer readable storage medium |
| CN113676975B (en) * | 2021-09-27 | 2022-08-26 | 中国联合网络通信集团有限公司 | Communication method, MME, MSC and communication system |
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