CN111836362A - Method and device for establishing call - 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
- H04W68/02—Arrangements for increasing efficiency of notification or paging channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W76/10—Connection setup
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- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W76/10—Connection setup
- H04W76/11—Allocation or use of connection identifiers
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Abstract
The invention discloses a method and a device for call establishment. The method comprises the following steps: acquiring frequency point information of a current different system cell; responding to second paging request information, and measuring the cell based on the current inter-system cell frequency point information to obtain a measurement result; the second paging request message is sent by the mobility management entity after responding to the first paging request message from the mobile switching center; determining a resident cell based on the measurement result and a preset resident condition; and generating and sending paging response information to a mobile switching center based on the resident cell so that the mobile switching center establishes a call based on the paging response information. The method can accelerate call establishment and improve user experience.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for call setup.
Background
The current Circuit Switched Fallback (CSFB) service flow mainly includes joint attachment, location update, a calling CSFB flow, a called CSFB flow, detach, and the like.
The step of establishing the call by the mobile terminal through the called CSFB process comprises the following steps: first, a Mobile Switching Center (MSC) sends a paging request to a Mobility Management Entity (MME); secondly, the MME sends a paging request to the mobile terminal; then, the mobile terminal receives the paging request of the MME and returns an extended service request to the MME, so that the MME instructs the base station to assist the mobile terminal to fall back to a proper cell according to the extended service request. It should be noted that, after the mobile terminal falls back to a suitable cell, if the cell identifier of the cell is different from the cell identifier pre-stored when the mobile terminal is jointly attached after being powered on, the mobile terminal also needs to perform location update, and sends out paging response information to the MSC after the location update is completed, so as to establish a call.
As can be seen from the above, the current CSFB call setup procedure is complicated, the call setup time is too long, and the user experience is poor.
Disclosure of Invention
Therefore, the invention provides a method and a device for call establishment, which aim to solve the problems of too long call establishment time and poor user experience caused by the complicated flow of the current CSFB call establishment in the prior art.
In order to achieve the above object, a first aspect of the present invention provides a method for call setup, including:
acquiring frequency point information of a current different system cell;
responding to second paging request information, and measuring the cell based on the current inter-system cell frequency point information to obtain a measurement result; the second paging request message is sent by the mobility management entity after responding to the first paging request message from the mobile switching center;
determining a resident cell based on the measurement result and a preset resident condition;
and generating and sending paging response information to a mobile switching center based on the resident cell so that the mobile switching center establishes a call based on the paging response information.
Preferably, the step of obtaining the frequency point information of the current different system cell includes:
receiving first cell system information; the first cell system information comprises first inter-system cell frequency point information;
and storing the frequency point information of the first different system cell as the frequency point information of the current different system cell.
Preferably, after the storing the first inter-system cell frequency point information as the current inter-system cell frequency point information, the method further includes:
receiving system information of a second cell; the second cell system information comprises second inter-system cell frequency point information;
comparing the current inter-system cell frequency point information with the second inter-system cell frequency point information to obtain a comparison result;
and when the comparison result shows that the current different system cell frequency point information is inconsistent with the second different system cell frequency point information, storing the second different system cell frequency point information as the current different system cell frequency point information.
Preferably, the step of receiving the second cell system information includes:
and receiving the system information of the second cell according to a preset time period.
Preferably, before the obtaining of the frequency point information of the current cell of the different system, the method further includes:
responding to a starting instruction, and sending a network attachment request to a mobility management entity;
receiving joint attachment response information; the joint attachment response information is information generated and returned by the mobility management entity based on the network attachment request.
Preferably, before generating and sending the paging response message to the mobile switching center based on the camped cell, the method further includes:
and sending the cell information of the resident cell to a mobility management entity so that the mobility management entity generates and sends response information to the mobile switching center based on the cell information.
Preferably, the preset residence conditions include: the transmission power of the reference signal of the cell is higher than a preset power threshold.
Preferably, the step of determining a camping cell based on the measurement result and a preset camping condition includes:
acquiring a pre-resident cell based on the measurement result and a preset resident condition; the transmitting power of the reference signal of the pre-resident cell is higher than a preset power threshold value; the measurement result comprises the transmitting power of a reference signal corresponding to a cell;
and selecting the pre-resident cell with the highest transmission power of the reference signal as the resident cell.
A second aspect of the present invention provides an apparatus for call setup, the apparatus comprising:
the first acquisition module is used for acquiring the frequency point information of the current different system cell;
the first measurement module is used for responding to the second paging request information, measuring the cell based on the current inter-system cell frequency point information and obtaining a measurement result; the second paging request message is sent by the mobility management entity after responding to the first paging request message from the mobile switching center;
a first determining module, configured to determine a camping cell based on the measurement result and a preset camping condition;
a first generating module, configured to generate paging response information based on a camped cell;
a first sending module, configured to send the paging response message to a mobile switching center, so that the mobile switching center establishes a call based on the paging response message.
Preferably, the above apparatus further comprises:
a first receiving module, configured to receive system information of a first cell; the first cell system information comprises first inter-system cell frequency point information;
and the first storage module is used for storing the frequency point information of the first different system cell as the frequency point information of the current different system cell.
The invention has the following advantages:
the invention provides a method for establishing a call, which firstly obtains the frequency point information of a current different system cell. Secondly, responding to second paging request information, and measuring the cell based on the frequency point information of the current different system cell to obtain a measuring result; the second paging request message is sent by the mobility management entity after responding to the first paging request message from the mobile switching center. Then, the resident cell is determined based on the measurement result and the preset resident condition, it should be noted that, in the method, the base station is not instructed by the mobility management entity to assist the mobile terminal to determine the resident cell, so that the time for determining the resident cell is shortened. And finally, generating and sending paging response information to the mobile switching center based on the resident cell so that the mobile switching center establishes a call based on the paging response information, thereby quickening call establishment and improving user experience.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a flowchart of a call setup method according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for updating frequency point information of a current inter-system cell according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a call setup apparatus according to an embodiment of the present invention.
In the drawings:
31: the first obtaining module 32: first measuring module
33: the first determination module 34: a first generation module
35: first sending module
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The current Circuit Switched Fallback (CSFB) service flow mainly includes joint attachment, location update, a calling CSFB flow, a called CSFB flow, detach, and the like.
The step of establishing the call by the mobile terminal through the called CSFB process comprises the following steps: first, a Mobile Switching Center (MSC) sends a paging request to a Mobility Management Entity (MME); secondly, the MME sends a paging request to the mobile terminal; then, the mobile terminal receives the paging request of the MME and returns an extended service request to the MME, so that the MME instructs the base station to assist the mobile terminal to fall back to a proper cell according to the extended service request. It should be noted that, after the mobile terminal falls back to a suitable cell, if the cell identifier of the cell is different from the cell identifier pre-stored when the mobile terminal is jointly attached after being powered on, the mobile terminal also needs to perform location update, and sends out paging response information to the MSC after the location update is completed, so as to establish a call.
As can be seen from the above, the current CSFB call setup procedure is complicated, the call setup time is too long, and the user experience is poor.
In order to solve the above problem, the present embodiment provides a method for call setup, as shown in fig. 1, the method includes the following steps:
step S101, obtaining frequency point information of a current different system cell.
The current inter-system cell frequency point information comprises a position area identifier, a network color code, a base station color code, an inter-system cell identifier and an inter-system cell frequency point.
It should be noted that the CSFB-enabled mobile terminal can only process the services of the circuit domain in the mobile communication network after the joint attachment is completed. Therefore, in one embodiment, after the mobile terminal is powered on, the joint attachment is first completed, and then the current inter-system cell frequency point information is acquired.
Wherein, the step that the mobile terminal completes the joint attachment comprises the following steps: first, the mobile terminal responds to a power-on command, and sends a network attachment request to a Mobility Management Entity (MME), where the network attachment request includes attachment type indication information and CSFB capability support indication information. Second, the mobile terminal receives the joint attach response information. The joint attach response information is information generated and returned by the mobility management entity based on the network attach request. In some embodiments, after receiving a network attach request of a mobile terminal, a mobility management entity sends Location update request information to a Visitor Location Register (VLR) according to the network attach request, where the Location update request information includes parameters such as a Location Area Identity (LAI), an International Mobile Subscriber Identity (IMSI), a domain name of an MME, and a Location update type. And the visitor location register generates and returns confirmation information to the mobility management entity after updating the location area identification code of the user based on the location updating request information. And the mobile management entity receives the confirmation information, generates and sends joint attachment response information to the mobile terminal based on the confirmation information so as to indicate that the joint attachment of the mobile terminal is completed.
In this embodiment, after the mobile terminal is powered on and completes the joint attachment, the step of acquiring the frequency point information of the current different system cell includes: first, a mobile terminal receives first cell system information, wherein the first cell system information is cell system information broadcasted by a base station to a network, and the first cell system information includes first inter-system cell frequency point information. Then, the mobile terminal stores the first inter-system cell frequency point information as the current inter-system cell frequency point information.
It should be noted that many times, the mobile terminal is in the process of moving, that is, the cells of the different systems around the mobile terminal are in the process of changing. In order to timely master the frequency point information of the different system cell in the current area of the mobile terminal, the mobile terminal needs to timely update the frequency point information of the different system cell after storing the frequency point information of the first different system cell as the frequency point information of the different system cell. In one embodiment, as shown in fig. 2, the method for updating the frequency point information of the current inter-system cell by the mobile terminal includes the following steps:
step S201, receiving the second cell system information.
The second cell system information is cell system information broadcasted by the base station to the network, and the second cell system information comprises second inter-system cell frequency point information. In some embodiments, the mobile terminal receives the system information of the second cell according to a preset time period, so as to implement a process of updating the frequency point information of the current cell of the different system under the condition of low loss of the mobile terminal. The preset time period may be 1 second.
Step S202, comparing the frequency point information of the current different system cell with the frequency point information of the second different system cell to obtain a comparison result.
And the comparison result comprises that the current inter-system cell frequency point information is consistent with the second inter-system cell frequency point information, or the current inter-system cell frequency point information is inconsistent with the second inter-system cell frequency point information.
Step S203, when the comparison result shows that the current inter-system cell frequency point information is inconsistent with the second inter-system cell frequency point information, storing the second inter-system cell frequency point information as the current inter-system cell frequency point information.
It should be noted that, when the comparison result indicates that the current inter-system cell frequency point information is inconsistent with the second inter-system cell frequency point information, it indicates that the inter-system cells around the mobile terminal have changed. In order to ensure the smooth establishment of the call, the mobile terminal needs to update the frequency point information of the current different system cell, that is, the frequency point information of the second different system cell is stored as the frequency point information of the current different system cell.
And step S102, responding to the second paging request information, and measuring the cell based on the frequency point information of the current different system cell to obtain a measuring result.
The measurement result includes cell identification and measurement parameter information, and the measurement parameter information includes transmission power of a reference signal and the like. The second paging request message is sent by the mobility management entity after responding to the first paging request message from the mobile switching center. The first paging request message is a message generated by the mobile switching center according to a call to the mobile terminal and sent to the mobility management entity when the network receives the call.
And step S103, determining a resident cell based on the measurement result and a preset resident condition.
Wherein, the resident cell is a cell where the mobile terminal falls back.
In one embodiment, the preset residence conditions include: the transmission power of the reference signal of the cell is higher than a preset power threshold. In this embodiment, the determining, by the mobile terminal, the camping cell based on the measurement result and the preset camping condition includes the following steps: first, the mobile terminal acquires a pre-camping cell based on the measurement result and a preset camping condition, for example, a cell in which the transmission power of the reference signal in the measurement result is higher than a preset power threshold is acquired as the pre-camping cell. Wherein, the measurement result comprises the transmitting power of the reference signal corresponding to the cell. And the transmission power of the reference signal of the pre-resident cell is higher than a preset power threshold value. And secondly, the mobile terminal selects a pre-resident cell with the highest transmission power of the reference signal as a resident cell.
It should be further noted that, in the current call setup process, after the mobile terminal receives and responds to the second paging request information sent by the mobility management entity, the mobile terminal returns an extended service request to the mobility management entity based on the second paging request information, so that the mobility management entity instructs the base station to assist the mobile terminal to determine the resident cell according to the extended service request. In addition, in the process that the base station assists the mobile terminal to determine the resident cell, the base station and the mobile terminal need to interact for many times to determine the resident cell. Namely, the current call establishment process has complicated steps, long required time and poor user experience. Therefore, in this embodiment, after receiving the second paging request information, the mobile terminal does not instruct the base station to assist the mobile terminal to fall back to the different system cell through the mobility management entity, but the mobile terminal directly measures the cell based on the obtained current frequency point information of the different system cell to obtain a measurement result, and determines the resident cell based on the measurement result and the preset resident condition, so that the step of determining the resident cell by the mobile terminal is reduced, the mobile terminal does not need to interact with the base station for multiple times to determine the resident cell, and the time of determining the resident cell by the mobile terminal is shortened.
And step S104, generating and sending paging response information to the mobile switching center based on the resident cell so that the mobile switching center establishes a call based on the paging response information.
The paging response information includes a cell identifier and a terminal identifier.
In another embodiment, in order to avoid that the mobile switching center repeatedly sends the first paging request message before the call is established, the mobile terminal first sends cell information of the resident cell to the mobility management entity before sending the paging response message to the mobile switching center, so that the mobility management entity generates and sends response message to the mobile switching center based on the cell information. It should be noted that, the mobile switching center may know that the mobile terminal has received the second paging response message of the mobility management entity based on the response message, and therefore, the mobile switching center does not repeatedly send the first paging request message to the mobility management entity any more.
The embodiment provides a call establishment method, which first obtains frequency point information of a current different system cell. Secondly, responding to second paging request information, and measuring the cell based on the frequency point information of the current different system cell to obtain a measuring result; the second paging request message is sent by the mobility management entity after responding to the first paging request message from the mobile switching center. Then, the resident cell is determined based on the measurement result and the preset resident condition, it should be noted that, in the method, the base station is not instructed by the mobility management entity to assist the mobile terminal to determine the resident cell, so that the time for determining the resident cell is shortened. And finally, generating and sending paging response information to the mobile switching center based on the resident cell so that the mobile switching center establishes a call based on the paging response information, thereby quickening call establishment and improving user experience.
The present embodiment further provides an apparatus for call setup, as shown in fig. 3, the apparatus includes: a first acquisition module 31, a first measurement module 32, a first determination module 33, a first generation module 34 and a first transmission module 35.
The first obtaining module 31 is configured to obtain frequency point information of a current inter-system cell. The current inter-system cell frequency point information comprises a position area identifier, a network color code, a base station color code, an inter-system cell identifier and an inter-system cell frequency point.
In one embodiment, the apparatus for call setup further comprises: the device comprises a first receiving module and a first storage module. The method for acquiring the frequency point information of the current different system cell by the call establishment device comprises the following steps: first, a first receiving module receives first cell system information, wherein the first cell system information is cell system information broadcasted by a base station to a network, and the first cell system information includes first inter-system cell frequency point information. And finally, the first storage module stores the frequency point information of the first different system cell as the frequency point information of the current different system cell.
It should be noted that the mobile terminal is often in the process of moving with the user, that is, the inter-system cells around the mobile terminal are in the process of changing. In order to timely master the frequency point information of the different system cell in the current area of the mobile terminal, the call establishment device needs to timely update the frequency point information of the different system cell after storing the frequency point information of the first different system cell as the frequency point information of the different system cell. In one embodiment, the apparatus for call setup further comprises a comparison module. The step of updating the frequency point information of the current different system cell by the call establishment device comprises the following steps:
first, the first receiving module receives system information of a second cell. The second cell system information is cell system information broadcasted by the base station to the network, and the second cell system information comprises second inter-system cell frequency point information. In some embodiments, the first receiving module receives the system information of the second cell according to a preset time period, so as to implement a process of updating the frequency point information of the current cell of the different system under the condition of low loss of the mobile terminal. The preset time period may be 1 second.
Then, the comparison module compares the current inter-system cell frequency point information with the second inter-system cell frequency point information to obtain a comparison result. And the comparison result comprises that the current inter-system cell frequency point information is consistent with the second inter-system cell frequency point information, or the current inter-system cell frequency point information is inconsistent with the second inter-system cell frequency point information.
And finally, when the comparison result shows that the current different-system cell frequency point information is inconsistent with the second different-system cell frequency point information, the first storage module stores the second different-system cell frequency point information as the current different-system cell frequency point information.
It should be noted that, when the comparison result indicates that the current inter-system cell frequency point information is inconsistent with the second inter-system cell frequency point information, it indicates that the inter-system cells around the mobile terminal have changed. In order to ensure the smooth establishment of the call, the call establishment device needs to update the current inter-system cell frequency point information, that is, the second inter-system cell frequency point information is stored as the current inter-system cell frequency point information.
And the first measurement module 32 is configured to respond to the second paging request information, and measure the cell based on the current inter-system cell frequency point information to obtain a measurement result.
The measurement result includes cell identification and measurement parameter information, and the measurement parameter information includes transmission power of a reference signal and the like. The second paging request message is sent by the mobility management entity after responding to the first paging request message from the mobile switching center. The first paging request message is a message generated by the mobile switching center according to a call to the mobile terminal and sent to the mobility management entity when the network receives the call.
The first determining module 33 is configured to determine a camping cell based on the measurement result and a preset camping condition. Wherein, the resident cell is a cell where the mobile terminal falls back.
In one embodiment, the first determination module 33 includes a first acquisition sub-module and a first selection sub-module. In the present embodiment, the preset residence conditions include: the transmission power of the reference signal of the cell is higher than a preset power threshold. The first determining module 33 determines the camping cell based on the measurement result and the preset camping condition, including the following steps: first, the first obtaining submodule obtains the pre-camping cell based on the measurement result and the preset camping condition, for example, the first obtaining submodule obtains a cell, as the pre-camping cell, in the measurement result, where the transmission power of the reference signal is higher than a preset power threshold. Wherein, the measurement result comprises the transmitting power of the reference signal corresponding to the cell. And the transmission power of the reference signal of the pre-resident cell is higher than a preset power threshold value. And secondly, the first selection submodule selects a pre-resident cell with the highest transmission power of the reference signal as a resident cell.
The first generating module 34 is configured to generate paging response information based on the camping cell. The paging response information includes a cell identifier and a terminal identifier.
The first sending module 35 is configured to send a paging response message to the mobile switching center, so that the mobile switching center establishes a call based on the paging response message.
In another embodiment, the apparatus for call setup further comprises a second sending module. In order to avoid that the mobile switching center continuously and repeatedly sends the first paging request message before the call is established, before the second sending module 35 sends the paging response message to the mobile switching center, the second sending module first sends the cell information of the camped cell to the mobility management entity, so that the mobility management entity generates and sends the response message to the mobile switching center based on the cell information. It should be noted that, the mobile switching center may know that the mobile terminal has received the second paging response message of the mobility management entity based on the response message, and therefore, the mobile switching center does not repeatedly send the first paging request message to the mobility management entity any more.
The working modes of the modules in the call setup apparatus provided in this embodiment correspond to the steps in the call setup method, and therefore, the detailed working modes of the modules in the call setup apparatus can refer to the call setup method provided in this embodiment.
In the present embodiment, a device for call setup is provided, first, a first obtaining module 31 obtains frequency point information of a current inter-system cell. Secondly, the first measurement module 32 responds to the second paging request information, and measures the cell based on the current inter-system cell frequency point information to obtain a measurement result; the second paging request message is sent by the mobility management entity after responding to the first paging request message from the mobile switching center. Then, the first determining module 33 determines the resident cell based on the measurement result and the preset resident condition, it should be noted that the apparatus does not instruct the base station to assist the mobile terminal to determine the resident cell through the mobility management entity any more, thereby shortening the time for determining the resident cell. Finally, the first generating module 34 generates paging response information based on the resident cell, and the first sending module 35 sends the paging response information to the mobile switching center, so that the mobile switching center establishes a call based on the paging response information, thereby speeding up call establishment and improving user experience.
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 (10)
1. A method for call setup, the method comprising:
acquiring frequency point information of a current different system cell;
responding to second paging request information, and measuring the cell based on the current inter-system cell frequency point information to obtain a measurement result; the second paging request message is sent by the mobility management entity after responding to the first paging request message from the mobile switching center;
determining a resident cell based on the measurement result and a preset resident condition;
and generating and sending paging response information to a mobile switching center based on the resident cell so that the mobile switching center establishes a call based on the paging response information.
2. The method according to claim 1, wherein the step of obtaining the frequency point information of the current inter-system cell comprises:
receiving first cell system information; the first cell system information comprises first inter-system cell frequency point information;
and storing the frequency point information of the first different system cell as the frequency point information of the current different system cell.
3. The method according to claim 2, wherein after storing the first inter-system cell frequency point information as the current inter-system cell frequency point information, further comprising:
receiving system information of a second cell; the second cell system information comprises second inter-system cell frequency point information;
comparing the current inter-system cell frequency point information with the second inter-system cell frequency point information to obtain a comparison result;
and when the comparison result shows that the current different system cell frequency point information is inconsistent with the second different system cell frequency point information, storing the second different system cell frequency point information as the current different system cell frequency point information.
4. The method of claim 3, wherein the step of receiving the second cell system information comprises:
and receiving the system information of the second cell according to a preset time period.
5. The method according to claim 1, wherein before the obtaining of the frequency point information of the current inter-system cell, further comprising:
responding to a starting instruction, and sending a network attachment request to a mobility management entity;
receiving joint attachment response information; the joint attachment response information is information generated and returned by the mobility management entity based on the network attachment request.
6. The method of claim 1, wherein before generating and sending the paging response message to the mobile switching center based on the camped cell, the method further comprises:
and sending the cell information of the resident cell to a mobility management entity so that the mobility management entity generates and sends response information to the mobile switching center based on the cell information.
7. The method of claim 1, wherein the preset dwell condition comprises: the transmission power of the reference signal of the cell is higher than a preset power threshold.
8. The method of claim 7, wherein the step of determining the camping cell based on the measurement result and a preset camping condition comprises:
acquiring a pre-resident cell based on the measurement result and a preset resident condition; the transmitting power of the reference signal of the pre-resident cell is higher than a preset power threshold value; the measurement result comprises the transmitting power of a reference signal corresponding to a cell;
and selecting the pre-resident cell with the highest transmission power of the reference signal as the resident cell.
9. An apparatus for call setup, the apparatus comprising:
the first acquisition module is used for acquiring the frequency point information of the current different system cell;
the first measurement module is used for responding to the second paging request information, measuring the cell based on the current inter-system cell frequency point information and obtaining a measurement result; the second paging request message is sent by the mobility management entity after responding to the first paging request message from the mobile switching center;
a first determining module, configured to determine a camping cell based on the measurement result and a preset camping condition;
a first generating module, configured to generate paging response information based on a camped cell;
a first sending module, configured to send the paging response message to a mobile switching center, so that the mobile switching center establishes a call based on the paging response message.
10. The apparatus of claim 9, further comprising:
a first receiving module, configured to receive system information of a first cell; the first cell system information comprises first inter-system cell frequency point information;
and the first storage module is used for storing the frequency point information of the first different system cell as the frequency point information of the current different system cell.
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