CN110557796B - Method and apparatus for returning to long term evolution network - Google Patents
Method and apparatus for returning to long term evolution network Download PDFInfo
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- CN110557796B CN110557796B CN201910880763.2A CN201910880763A CN110557796B CN 110557796 B CN110557796 B CN 110557796B CN 201910880763 A CN201910880763 A CN 201910880763A CN 110557796 B CN110557796 B CN 110557796B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/06—Reselecting a communication resource in the serving access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/165—Performing reselection for specific purposes for reducing network power consumption
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
- H04W68/005—Transmission of information for alerting of incoming communication
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Abstract
The invention discloses a method and a device for returning to a long-term evolution network, wherein the method comprises the following steps: after determining that the joint attachment is completed, acquiring a frequency point association table, wherein the frequency point association table comprises an identifier of a first type cell and frequency point information of a second type cell, the coverage area of the first type cell is overlapped with the coverage area of the second type cell, and the network type of the second type cell is a long term evolution network; responding to a paging request sent by a calling terminal, and establishing voice communication with the calling terminal; and if the voice communication is determined to be completed and the frequency point information of the second type cell to be returned is not received within the preset time length, determining the frequency point information of the second type cell to be returned according to the identifier of the currently resident first type cell and the frequency point association table. By searching the frequency point association table, the frequency point information of the second type cell needing to be returned is obtained, so that the terminal returns to the second type cell after completing the voice service in the circuit domain fallback, the fast and high-quality communication network speed of the long-term evolution network is enjoyed, and the user experience is improved.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a method and a device for returning to a long term evolution network.
Background
In the initial stage of Time Division Long Term Evolution (TD-LTE) Network construction, if an operator already has a mature Universal Terrestrial Radio Access Network (UTRAN) or GSM Radio Access Network (GERAN), the operator may use the original CS domain voice scheme to provide voice services and the TD-LTE Network only processes packet Switched data services in view of protection of device investment in the Circuit Switched (CS) domain in conjunction with a deployment strategy of the TD-LTE Network. Among them, GSM is Global System for Mobile Communication (GSM). In this case, a Circuit Switched Fallback (CSFB) technology is adopted, that is, when the terminal under LTE coverage processes the voice service, the terminal first falls back to the CS domain network, and processes the voice service in the CS domain network; therefore, the aim of reusing the existing CS domain equipment to provide the traditional voice service for the user in the TD-LTE network is achieved.
However, after the CS domain voice service is finished and the terminal has a packet switched data service requirement, if the terminal does not return to the LTE network in time, the terminal will continue to process the packet switched data service in the GERAN or UTRAN network where the voice service is performed, so that the user cannot enjoy the fast network speed of LTE, which seriously affects the network experience of the user.
Disclosure of Invention
Therefore, the invention provides a method and a device for returning to a long term evolution network, which aim to solve the problem that in the prior art, the user experience is reduced because a terminal cannot return to the long term evolution network in time after the CS domain voice service is finished.
In order to achieve the above object, a first aspect of the present invention provides a method for returning to a long term evolution network, the method comprising: after determining that the joint attachment is completed, acquiring a frequency point association table, wherein the frequency point association table comprises an identifier of a first type cell and frequency point information of a second type cell, the coverage area of the first type cell is overlapped with the coverage area of the second type cell, and the network type of the second type cell is a long term evolution network; responding to a paging request sent by a calling terminal, and establishing voice communication with the calling terminal; and if the voice communication is determined to be completed and the frequency point information of the second type cell to be returned is not received within the preset time length, determining the frequency point information of the second type cell to be returned according to the identifier of the currently resident first type cell and the frequency point association table.
Wherein the step of jointly attaching comprises: sending an attachment request to a mobile management entity, wherein the attachment request comprises an attachment type which is joint attachment; and determining to complete the joint attachment in response to the attachment response returned by the mobile management entity.
The step of obtaining the frequency point association table comprises the following steps: receiving an association indication message sent by a mobile management entity; and acquiring a frequency point association table according to the association indication message.
Wherein, responding to the paging request sent by the calling terminal, and establishing voice communication with the calling terminal comprises the following steps: responding to a paging request which is forwarded by a mobile management entity and sent by a mobile switching center corresponding to a calling terminal, and sending an extended service request to the mobile management entity so that the mobile management entity obtains an identifier of a fallback cell configured by a base station corresponding to a first-class cell according to a circuit domain fallback identifier carried in the extended service request; and establishing voice communication with the calling terminal according to the identifier of the fallback cell.
Wherein, according to the mark of the falling cell, the step of establishing voice communication with the calling terminal comprises: if the cell identification is different from the identification of the fallback cell when the joint attachment is carried out, updating the position information; if the update of the position information is determined to be completed, sending a paging response to the corresponding mobile switching center, and establishing voice communication.
The step of determining the frequency point information of the second type cell to be returned according to the identifier of the first type cell which resides currently and the frequency point association table comprises the following steps: using the mark of the first type cell which resides at present as an index, searching a frequency point association table to obtain the corresponding relation between the mark of the first type cell and the frequency point information of the second type cell; and determining the frequency point information of the second type cell to be returned according to the corresponding relation between the identifier of the first type cell and the frequency point information of the second type cell.
In order to achieve the above object, a second aspect of the present invention provides a method for returning to a long term evolution network, the method comprising: determining a frequency point association table according to the overlapping coverage range of the first type cell and the second type cell, wherein the frequency point association table comprises the identification of the first type cell and the frequency point information of the second type cell, the coverage range of the first type cell is overlapped with the coverage range of the second type cell, and the network type of the second type cell is a long term evolution network; and if the joint attachment is determined to be completed, sending the frequency point association table to the terminal, so that when the terminal determines that the voice service in the circuit switched fallback is completed and the terminal does not receive the frequency point information of the second cell to be returned within the preset time length, the frequency point information of the second cell to be returned by the terminal is determined according to the identifier of the first cell and the frequency point association table which reside at present.
The method comprises the following steps of determining a frequency point association table according to the overlapping coverage range of a first type cell and a second type cell, wherein the step comprises the following steps: acquiring a first coverage range of a first type cell; acquiring a second coverage range of the second type cell; searching and obtaining an overlapping coverage range of the first coverage range and the second coverage range; and determining a frequency point association table according to the overlapping coverage range.
In order to achieve the above object, a third aspect of the present invention provides an apparatus for returning to a long term evolution network, including: an obtaining module, configured to obtain a frequency point association table after determining that joint attachment is completed, where the frequency point association table includes an identifier of a first-class cell and frequency point information of a second-class cell, a coverage area of the first-class cell overlaps with a coverage area of the second-class cell, and a network type of the second-class cell is a long term evolution network; the voice communication establishing module is used for responding to a paging request sent by the calling terminal and establishing voice communication with the calling terminal; and the frequency point information return determining module is used for determining the frequency point information of the second type cell to be returned according to the identifier of the first type cell and the frequency point association table which reside at present when the voice communication is determined to be completed and the frequency point information of the second type cell to be returned is not received within the preset time length.
In order to achieve the above object, a fourth aspect of the present invention provides an apparatus for returning to a long term evolution network, including: the determining module is used for determining a frequency point association table according to the overlapping coverage range of the first type cell and the second type cell, wherein the frequency point association table comprises the identifier of the first type cell and the frequency point information of the second type cell, the coverage range of the first type cell is overlapped with the coverage range of the second type cell, and the network type of the second type cell is a long term evolution network; and the sending module is used for sending the frequency point association table to the terminal after the joint attachment is determined to be completed, so that when the terminal determines that the voice service in the circuit domain fallback is completed and the terminal does not receive the frequency point information of the second cell to be returned within a preset time length, the frequency point information of the second cell to be returned by the terminal is determined according to the identifier of the currently resident first cell and the frequency point association table.
The invention has the following advantages: after the terminal completes the voice service in the circuit switched fallback, if the frequency point information of the long term evolution network needing to be returned is not received within the preset duration, namely the frequency point information of the second type cell, the terminal can search the obtained frequency point association table according to the identifier of the first cell where the terminal currently resides, and obtain the frequency point information of the second type cell needing to be returned, so that the terminal can be re-accessed into the long term evolution network according to the frequency point information of the second type cell, and the user can still enjoy the fast and high-quality communication network speed of the long term evolution network after completing the voice service in the circuit switched fallback, and further improve the 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 method for returning to a long term evolution network according to a first embodiment of the present invention;
fig. 2 is a flowchart of a method for returning to a long term evolution network according to a second embodiment of the present invention;
fig. 3 is a block diagram of a method for returning to a long term evolution network according to a third embodiment of the present invention;
fig. 4 is a block diagram of an apparatus for returning to a long term evolution network according to a fourth embodiment of the present invention;
fig. 5 is a block diagram of an apparatus returning to a long term evolution network according to a fifth embodiment of the present invention;
fig. 6 is a flowchart of a method for performing joint attachment for a terminal according to a sixth embodiment of the present invention;
fig. 7 is a system block diagram of a return to long term evolution network according to a sixth embodiment of the present invention.
In the drawings:
401: the acquisition module 402: establishing a voice communication module
403: the module 501 for determining returned frequency point information: determining module
502: the sending module 6001: 4G terminal
6002: the mobility management entity 6003: visitor location register
6004: home location register 7001: calling terminal
7002: mobile switching center 7003: 4G base station
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.
A first embodiment of the invention relates to a method of returning to a long term evolution network. The method and the device are used for enabling the terminal to return to the long-term evolution network in time after the voice service in the CS domain is finished so as to obtain high-quality network service and improve user experience.
The implementation details of the method for returning to the long term evolution network in the present embodiment are specifically described below, and the following is only for facilitating understanding of the implementation details of the present solution, and is not necessary to implement the present solution.
Fig. 1 is a flowchart of a method for returning to a long term evolution network in this embodiment, where the method may be applied to a called terminal, and the called terminal may be a smart phone installed with a Subscriber Identity Module (SIM), or may be other devices capable of performing voice communication, such as a tablet computer and a smart watch, which are described above only by way of example, and other terminals not described above are within the protection scope of the present application.
The method may include the following steps.
In step 101, after determining that the joint attachment is completed, a frequency point association table is obtained.
The frequency point association table comprises an identifier of a first type cell and frequency point information of a second type cell, the coverage area of the first type cell is overlapped with the coverage area of the second type cell, and the network type of the second type cell is a long term evolution network.
It should be noted that the frequency point association table may be obtained by receiving a relevant message sent by the mobility management entity. The network type of The first type cell in The frequency point association table is a second Generation Mobile Communication network (The 2Generation Mobile Communication Technology, 2G) or a third Generation Mobile Communication network (The 3Generation Mobile Communication Technology, 3G); the network type of The second type of cell is a long term evolution network, that is, The second type of cell may be a cell in The fourth Generation Mobile Communication network (4G), or a cell in The fifth Generation Mobile Communication network (5G), which is not limited herein, and other non-described long term evolution networks are also within The protection scope of The present application, and are not described herein again.
In one specific implementation, an association indication message sent by a mobility management entity is received; and acquiring a frequency point association table according to the association indication message.
It should be noted that the association indication message carries a frequency point association table, where the association indication message is used to indicate that the terminal has completed joint attachment, and the identifier of the corresponding first-type cell, the identifier of the second-type cell, and the overlapping coverage of the first-type cell and the second-type cell may be obtained according to the frequency point association table, so as to facilitate subsequent processing.
In step 102, voice communication is established with the calling terminal in response to a paging request sent by the calling terminal.
In a specific implementation, in response to a paging request, which is forwarded by a mobile management entity and sent by a mobile switching center corresponding to a calling terminal, an extended service request is sent to the mobile management entity, so that the mobile management entity obtains, according to a circuit domain fallback identifier carried in the extended service request, an identifier of a fallback cell configured by a base station corresponding to a first-class cell; and establishing voice communication with the calling terminal according to the identifier of the fallback cell.
It should be noted that the CS fallback flag is used to indicate that the terminal has the CS fallback capability, that is, the related processing procedure of the voice communication can be dropped to the 2G or 3G communication network for processing, so that the existing CS domain device of the operator can be fully utilized, and the device cost of the operator can be reduced.
Wherein, the step of establishing voice communication with the calling terminal according to the identifier of the fallback cell comprises: if the cell identification is different from the identification of the fallback cell when the joint attachment is carried out, updating the position information; if the update of the position information is determined to be completed, sending a paging response to the corresponding mobile switching center, and establishing voice communication.
It should be noted that, a terminal performing voice communication with the calling terminal is a 4G terminal, the 4G terminal may carry a 4G multimode card or may be a 5G terminal, and no limitation is made herein, the terminal may be any terminal in a long term evolution network, and network types of other terminals not described are also within the protection scope of the present application, and are not described herein again.
Specifically, when the identifier of the fallback cell acquired by the terminal is not the cell identifier when the terminal performs the joint attachment, it indicates that the location of the terminal has changed, and needs to update its own location information, and simultaneously informs the mobile switching center of the location information of the terminal, so that the mobile switching center can acquire the corresponding cell information, and further enable the calling terminal and the terminal to establish the voice communication.
In step 103, if it is determined that the voice communication is completed and the frequency point information of the second cell to be returned is not received within the preset time period, the frequency point information of the second cell to be returned is determined according to the identifier of the currently resident first cell and the frequency point association table.
In specific implementation, a timer is started to start timing after the terminal completes voice communication, and if the frequency point information of the second cell to be returned is not received within a preset time period, the frequency band association table is searched to obtain the frequency point information of the second cell to be returned, so that the terminal can return to a long-term evolution network as soon as possible, the time period for selecting the network by a user is reduced, and better use experience is brought to the user.
In a specific implementation, the identifier of a first type cell which resides at present is used as an index, and a frequency point association table is searched to obtain the corresponding relation between the identifier of the first type cell and the frequency point information of a second type cell; and determining the frequency point information of the second type cell to be returned according to the corresponding relation between the identifier of the first type cell and the frequency point information of the second type cell.
For example, the identifier of the first type cell is 10054, and the frequency point information of the second type cell is determined by looking up whether the cell identifier of 10054 exists in the frequency point association table. If the cell with the cell identifier of 10054 is found in the frequency point association table, according to the corresponding relationship between the identifier of the first type cell and the frequency point information of the second type cell, for example, the frequency point information of the second type cell corresponding to 10054 is the frequency point a in the 40 frequency band, the frequency point a is the frequency point of the second type cell that the terminal needs to return, and the terminal can access the second type cell with the frequency point a, so that the terminal can still enjoy the fast and high-quality communication network speed of the long-term evolution network after completing the voice service in the circuit domain fallback.
In this embodiment, after the terminal completes the voice service in the circuit switched fallback, if the frequency point information of the long term evolution network that needs to be returned, that is, the frequency point information of the second type cell, is not received within a preset duration, the terminal may search the obtained frequency point association table according to the identifier of the first cell where the terminal currently resides, and obtain the frequency point information of the second type cell that needs to be returned, so that the terminal can be re-accessed to the long term evolution network according to the frequency point information of the second type cell, and it is ensured that the user can still enjoy the fast and high-quality communication network speed of the long term evolution network after completing the voice service in the circuit switched fallback, thereby improving the user experience.
A second embodiment of the invention relates to a method of returning to a long term evolution network. The second embodiment is substantially the same as the first embodiment, and mainly differs therefrom in that: before acquiring the frequency point association table, the terminal needs to perform joint attachment.
Fig. 2 is a flowchart of a method for returning to a long term evolution network in this embodiment, where the method may be applied to a called terminal, and the called terminal may be a smart phone installed with a Subscriber Identity Module (SIM), or may be other devices capable of performing voice communication, such as a tablet computer and a smart watch, which are described above only by way of example, and other terminals not described above are within the protection scope of the present application. The method may include the following steps.
In step 201, an attach request is sent to the mobility management entity.
Wherein, the attach request includes an attach type, and the attach type is a joint attach.
It should be noted that, in a specific implementation, the attach request may include not only an attach type, but also a terminal capability value, where the attach type indicates that the attach flow is a joint attach flow, and the terminal capability value indicates that the terminal has a capability of falling back from the circuit domain. The Mobility Management Entity may be a Mobility Management Entity (MME) in a 4G communication network, or an Access and Mobility Management Function Entity (AMF) in a 5G communication network, which is described above only by way of example, and other non-described Mobility Management entities are also within the protection scope of the present application and are not described herein again.
In step 202, it is determined that the joint attach is completed in response to the attach response returned by the mobility management entity.
In a specific implementation, after receiving an attach request sent by a terminal, a mobility management entity sends a local update request to a corresponding Visitor Location Register (VLR), where the local update request may include parameters such as a new Location area code, an identifier of the terminal, a name of the mobility management entity, and a local update type; the VLR stores the information of the mobility management entity, creates an SGs interface association relationship between the mobility management entity and the terminal, initiates a Location updating process between the VLR and a Home Location Register (HLR) according to the user information and the Location area information, and simultaneously sends a confirmation message to the mobility management entity, wherein the confirmation message can carry a frequency point association table and a corresponding relationship between the terminal and the mobility management entity, namely the SGs interface association relationship.
In step 203, after determining that the joint attachment is completed, a frequency point association table is obtained.
In step 204, voice communication is established with the calling terminal in response to the paging request sent by the calling terminal.
In step 205, if it is determined that the voice communication is completed and the frequency point information of the second cell to be returned is not received within the preset time period, the frequency point information of the second cell to be returned is determined according to the identifier of the currently residing first cell and the frequency point association table.
It should be noted that steps 203 to 205 in this embodiment are the same as steps 101 to 103 in the first embodiment, and are not repeated herein.
In the embodiment, the mobile management entity can know that the terminal needs to perform joint attachment by sending the attachment request carrying the attachment type to the mobile management entity, so that the terminal can acquire the frequency point association table after determining that the joint attachment is completed; after the voice service in the circuit domain fallback is completed, if the frequency point information of the long term evolution network needing to be returned, namely the frequency point information of the second type cell, is not received within a preset time period, the terminal can search the obtained frequency point association table according to the identifier of the first cell where the terminal currently resides, and obtain the frequency point information of the second type cell needing to be returned, so that the terminal can be re-accessed into the long term evolution network according to the frequency point information of the second type cell, a user can still enjoy the fast and high-quality communication network speed of the long term evolution network after the voice service in the circuit domain fallback is completed, and further the user experience degree is improved.
A third embodiment of the present invention relates to a method of returning to a long term evolution network. The implementation details of the method for returning to the long term evolution network in the present embodiment are specifically described below, and the following is only for facilitating understanding of the implementation details of the present solution, and is not necessary to implement the present solution.
Fig. 3 is a flowchart of a method for returning to a long term evolution network in this embodiment, where the method may be used for a mobility management entity, where the mobility management entity may be an MME in a 4G communication network or an AMF in a 5G communication network, which are described above only by way of example, and other non-described mobility management entities are also within the protection scope of the present application and are not described herein again. The method may include the following steps.
In step 301, a frequency point association table is determined according to overlapping coverage areas of the first type cell and the second type cell.
The frequency point association table comprises an identifier of a first type cell and frequency point information of a second type cell, the coverage area of the first type cell is overlapped with the coverage area of the second type cell, and the network type of the second type cell is a long term evolution network.
It should be noted that the network type of the first type cell is a 2G communication network or a 3G communication network; the lte network may include a 4G communication network or a 5G communication network, which are only examples, and the specific type of the lte network is not limited herein, and other lte networks not described are also within the protection scope of the present application, and are not described herein again.
In one specific implementation, a first coverage area of a first type cell is obtained; acquiring a second coverage range of the second type cell; searching and obtaining an overlapping coverage range of the first coverage range and the second coverage range; and determining a frequency point association table according to the overlapping coverage range.
For example, in the rectangular coordinate, the coordinates (1,1) are used as circles and the radius is 1, the second coverage area is a circle in the rectangular coordinate, the coordinates (2.5,2) are used as circles and the radius is 1, an overlapping portion exists between the first coverage area and the second coverage area, the overlapping portion is an overlapping coverage area, if the terminal appears in the overlapping coverage area, the terminal can simultaneously acquire the broadcast messages sent by the first type cell and the second type cell, and further acquire the identifier of the first type cell and the frequency point information of the second type cell, so that the mobile management entity can acquire the corresponding relationship between the two types of cells according to the measurement information reported by the terminal and establish the association table.
In step 302, if it is determined that the joint attachment is completed, the frequency point association table is sent to the terminal.
It should be noted that, when the terminal is in the overlapping coverage range, joint attachment may be completed, and the frequency point association table sent by the mobility management entity is obtained. Because the terminal can carry out circuit switched fallback, namely, voice communication service is fallback to the CS domain network for processing, an operator can still utilize the originally adopted hardware equipment of the CS domain after the network is upgraded, and the equipment cost is reduced. And then when the terminal determines that the voice service in the circuit switched fallback is completed and the terminal does not receive the frequency point information of the second type cell to be returned within the preset time, the frequency point information of the second type cell to be returned by the terminal is determined according to the identifier of the currently-resident first type cell and the frequency point association table, so that the terminal can still enjoy the fast and high-quality communication network speed of the long-term evolution network after the voice communication service in the circuit switched fallback is completed, and further the user experience degree is improved.
In this embodiment, the frequency point association table is determined by obtaining the overlapping coverage range of the first-class cell and the second-class cell, and the frequency point association table is sent to the terminal, so that the terminal can complete the voice service in the circuit domain fallback, and when the terminal does not receive the frequency point information of the second-class cell to be returned within a preset time, the frequency point information of the second-class cell to be returned by the terminal can be determined according to the identifier of the currently-resident first-class cell and the frequency point association table, so that the terminal can still enjoy the fast and high-quality communication network speed of the long-term evolution network after the voice communication service in the circuit domain fallback is completed, and further improve the user experience.
The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the same logical relationship is included, which are all within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.
A fourth embodiment of the present invention relates to a device for returning to a long term evolution network, and specific implementation of the device may refer to the related description of the first embodiment, and repeated details are omitted. It should be noted that, the specific implementation of the apparatus in this embodiment may also refer to the related description of the second embodiment, but is not limited to the above two examples, and other unexplained examples are also within the protection scope of the apparatus.
Fig. 4 is a device for returning to a long term evolution network in this embodiment, and the device mainly includes: an obtaining module 401, configured to obtain a frequency point association table after determining that joint attachment is completed, where the frequency point association table includes an identifier of a first-class cell and frequency point information of a second-class cell, a coverage area of the first-class cell overlaps with a coverage area of the second-class cell, and a network type of the second-class cell is a long term evolution network; a voice communication establishing module 402, configured to establish voice communication with the calling terminal in response to a paging request sent by the calling terminal; a module 403 for determining frequency point information to be returned, configured to determine, when it is determined that voice communication is completed and the frequency point information of the second type cell to be returned is not received within a preset time period, the frequency point information of the second type cell to be returned according to the identifier of the currently-residing first type cell and the frequency point association table.
A fifth embodiment of the present invention relates to a device for returning to a long term evolution network, and the specific implementation of the device may refer to the related description of the third embodiment, but is not limited to the above embodiment, and other embodiments not described are also within the protection scope of the device, and repeated details are not repeated.
Fig. 5 is a device for returning to a long term evolution network in this embodiment, and the device mainly includes: a determining module 501, configured to determine a frequency point association table according to an overlapping coverage area of a first-class cell and a second-class cell, where the frequency point association table includes an identifier of the first-class cell and frequency point information of the second-class cell, the coverage area of the first-class cell overlaps with the coverage area of the second-class cell, and the network type of the second-class cell is a long term evolution network; a sending module 502, configured to send the frequency point association table to the terminal after it is determined that the joint attachment is completed, so that when the terminal determines that the voice service in the circuit switched fallback is completed and the terminal does not receive the frequency point information of the second type cell to be returned within a preset time, the frequency point information of the second type cell to be returned by the terminal is determined according to the identifier of the currently residing first type cell and the frequency point association table.
It should be noted that each module referred to in this embodiment is a logical module, and in practical applications, one logical unit may be one physical unit, may be a part of one physical unit, and may be implemented by a combination of multiple physical units. In addition, in order to highlight the innovative part of the present invention, elements that are not so closely related to solving the technical problems proposed by the present invention are not introduced in the present embodiment, but this does not indicate that other elements are not present in the present embodiment.
A sixth embodiment of the present invention relates to a system for returning to a long term evolution network, and as shown in fig. 6 and 7, the system specifically includes: a 4G terminal 6001, a mobility management entity 6002(MME), a visitor location register 6003(VLR) and a home location register 6004 (HLR); a calling terminal 7001, a mobile switching center 7002(MSC), and a 4G base station 7004.
Fig. 6 is a flowchart of performing a joint attachment and obtaining a frequency point association table by a 4G terminal, where the joint attachment specifically includes the following steps.
In step 601, after the 4G terminal 6001 is powered on, the joint attach process of the 4G terminal 6001 is started, and an attach request is sent to the mobility management entity 6002.
It should be noted that the attach request includes an attach type and a terminal capability value, where the attach type indicates that this is a joint attach procedure, and the terminal capability value is used to indicate that the 4G terminal 6001 has the capability of circuit domain fallback. The mobility management entity 6002 may be an MME in a 4G network, or an AMF in a 5G network, which is described above only by way of example, and other non-described mobility management entities are also within the protection scope of the present application, and are not described herein again.
In step 602, the mobility management entity 6002 sends a local update request to the corresponding VLR.
It should be noted that the local UPDATE REQUEST (e.g., the message SGsAP-LOCATION-UPDATE-REQUEST) includes parameters such as a new LOCATION area identifier, an International Mobile Subscriber Identity (IMSI) of the 4G terminal 6001, a name of the Mobile management entity 6002, and a local UPDATE type. The SGsAP is an application protocol of an SGs interface, and the SGs interface refers to an interface between an MME and an MSC, and is used for handling mobility management, a paging procedure, and the like between an Evolved Packet System (EPS) and a CS domain.
In step 603, the VLR stores the information of the mobility management entity 6002 and creates an SGs interface association between the mobility management entity 6002 and the MSC.
In step 604, the VLR initiates a location update procedure with the HLR regarding the 4G terminal 6001 according to the subscriber information and the location area information.
In step 605, the VLR sends location update confirmation information to the mobility management entity 6002.
In step 606, the mobility management entity 6002 sends an attach response message to the 4G terminal 6001, completing the joint attach.
In step 607, after the terminal receives the attach response and determines that the combined attach procedure is completed, the mobility management entity 6002 issues a frequency point association table to the 4G terminal 6001.
It should be noted that the frequency point association table may be determined by using the following acquisition process, where the specific acquisition process includes: the method comprises the steps of obtaining a coverage area of a 4G cell corresponding to a base station under the jurisdiction of a mobile management entity 6002, obtaining a coverage area of a 2G cell and a 3G cell corresponding to a base station under the jurisdiction of an MSC, finding out an overlapping coverage area of the 2G cell and the 3G cell and the 4G cell, determining a frequency point association table according to the overlapping coverage area, wherein the frequency point association table comprises the 4G cell corresponding to the overlapping coverage area and a corresponding relation between the 2G cell and the 3G cell, and the mobile management entity 6002 stores the frequency point association table.
Fig. 7 is a flowchart of the 4G terminal receiving the call request of the calling terminal to perform voice communication after completing the joint attachment, and returning to the LTE network after completing the voice communication.
In step 701, the calling terminal 7001 sends a paging request to the corresponding mobile switching center 7002, and the mobile switching center 7002 forwards the paging request to the mobility management entity 6002 corresponding to the called terminal (i.e., the 4G terminal 6001), so that the mobility management entity 6002 forwards the paging request to the 4G terminal 6001.
In step 702, after receiving the paging request sent by the mobility management entity 6002, the 4G terminal 6001 sends an extended service request to the mobility management entity 6002.
In step 703, the mobility management entity 6002 sends a 4G terminal 6001 fallback cell indication to the 4G base station 7003.
In step 704, the 4G base station 7003 transmits the configured fallback cell information to the 4G terminal 6001.
In step 705, the 4G terminal 6001 performs a fallback cell measurement and sends the measurement result to the 4G base station 7003.
In step 706, the 4G base station 7003 determines an appropriate fallback cell according to the measurement result reported by the 4G terminal 6001, and sends the information of the fallback cell to the 4G terminal 6001, so that the 4G terminal 6001 can fallback to the appropriate fallback cell.
In step 707, if the dropped cell is not consistent with the cell identifier at the time of the joint attachment, the 4G terminal 6001 first performs location update.
In step 708, after the 4G terminal 6001 completes the location update, it sends a paging response message to the MSC that it has determined to establish voice communication with the calling terminal 7001.
In step 709, after the voice communication in step 708 is finished, the 4G terminal 6001 starts a timer, and if the timer expires and the 4G terminal 6001 still does not receive the frequency point information of the LTE Network cell issued by the corresponding Radio Network Controller (RNC), the 4G terminal 6001 searches for the corresponding 4G cell frequency point in the frequency point association table according to the currently-residing cell identifier, so that the found 4G cell frequency point returns to the 4G Network.
In step 710, if the cell identifier currently camped on is not in the frequency point association table stored in the 4G terminal 6001, the 4G terminal 6001 returns to the LTE network according to the normal return flow.
In this embodiment, after the terminal completes the voice service in the circuit switched fallback, if the frequency point information of the long term evolution network that needs to be returned, that is, the frequency point information of the second type cell, is not received within a preset duration, the terminal may search the obtained frequency point association table according to the identifier of the first cell where the terminal currently resides, and obtain the frequency point information of the second type cell that needs to be returned, so that the terminal can be re-accessed to the long term evolution network according to the frequency point information of the second type cell, and it is ensured that the user can still enjoy the fast and high-quality communication network speed of the long term evolution network after completing the voice service in the circuit switched fallback, thereby improving the 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 returning to a long term evolution network, the method comprising:
after determining that the joint attachment is completed, acquiring a frequency point association table, wherein the frequency point association table comprises an identifier of a first type cell and frequency point information of a second type cell, the coverage area of the first type cell is overlapped with the coverage area of the second type cell, and the network type of the second type cell is a long term evolution network;
responding to a paging request sent by a calling terminal, and establishing voice communication with the calling terminal;
and if the voice communication is determined to be completed and the frequency point information of the second type cell to be returned is not received within the preset time length, determining the frequency point information of the second type cell to be returned according to the identifier of the first type cell which is resident at present and the frequency point association table.
2. The method of claim 1, wherein the jointly attaching step comprises:
sending an attachment request to a mobile management entity, wherein the attachment request comprises an attachment type, and the attachment type is joint attachment;
determining to complete the joint attach in response to an attach response returned by the mobility management entity.
3. The method according to claim 2, wherein the step of obtaining the frequency point association table comprises:
receiving an association indication message sent by the mobile management entity;
and acquiring the frequency point association table according to the association indication message.
4. The method of claim 1, wherein the step of establishing voice communication with the calling terminal in response to the paging request sent by the calling terminal comprises:
responding to a paging request which is forwarded by a mobile management entity and sent by a mobile switching center corresponding to a calling terminal, and sending an extended service request to the mobile management entity so that the mobile management entity obtains an identifier of a fallback cell configured by a base station corresponding to a first type cell according to a circuit domain fallback identifier carried in the extended service request;
and establishing the voice communication with the calling terminal according to the identifier of the fallback cell.
5. The method of claim 4, wherein the step of establishing the voice communication with the calling terminal according to the identity of the fallback cell comprises:
if the cell identification when the joint attachment is carried out is different from the identification of the fallback cell, updating the position information;
and if the updating of the position information is determined to be completed, sending a paging response to the corresponding mobile switching center to establish the voice communication.
6. The method according to any of claims 1 to 5, wherein the step of determining the frequency point information of the second type cell to be returned according to the identifier of the first type cell currently residing and the frequency point association table comprises:
using the identifier of the first type cell which resides at present as an index, searching the frequency point association table to obtain the corresponding relation between the identifier of the first type cell and the frequency point information of the second type cell;
and determining the frequency point information of the second type cell to be returned according to the corresponding relation between the identifier of the first type cell and the frequency point information of the second type cell.
7. A method for returning to a long term evolution network, the method comprising:
determining a frequency point association table according to the overlapping coverage range of a first type cell and a second type cell, wherein the frequency point association table comprises the identification of the first type cell and the frequency point information of the second type cell, the coverage range of the first type cell is overlapped with the coverage range of the second type cell, and the network type of the second type cell is a long term evolution network;
and if the joint attachment is determined to be completed, sending the frequency point association table to a terminal so that the terminal determines the frequency point information of the second type cell which needs to be returned by the terminal according to the identifier of the first type cell which is resident at present and the frequency point association table when the terminal determines that the voice service in the circuit switched fallback is completed and the terminal does not receive the frequency point information of the second type cell which needs to be returned within a preset time length.
8. The method according to claim 7, wherein the step of determining the frequency point association table according to the overlapping coverage of the first type cell and the second type cell comprises:
acquiring a first coverage range of the first type cell;
acquiring a second coverage range of the second type cell;
searching for an overlapping coverage range of the first coverage range and the second coverage range;
and determining the frequency point association table according to the overlapping coverage range.
9. An apparatus for returning to a long term evolution network, comprising:
an obtaining module, configured to obtain a frequency point association table after determining that joint attachment is completed, where the frequency point association table includes an identifier of a first type cell and frequency point information of a second type cell, a coverage area of the first type cell overlaps a coverage area of the second type cell, and a network type of the second type cell is a long term evolution network;
the voice communication establishing module is used for responding to a paging request sent by a calling terminal and establishing voice communication with the calling terminal;
and the frequency point information return determining module is used for determining the frequency point information of the second type cell to be returned according to the identifier of the first type cell which is resident at present and the frequency point association table when the voice communication is determined to be completed and the frequency point information of the second type cell to be returned is not received within the preset time length.
10. An apparatus for returning to a long term evolution network, comprising:
a determining module, configured to determine a frequency point association table according to an overlapping coverage area of a first-class cell and a second-class cell, where the frequency point association table includes an identifier of the first-class cell and frequency point information of the second-class cell, the coverage area of the first-class cell overlaps with the coverage area of the second-class cell, and the network type of the second-class cell is a long term evolution network;
and the sending module is used for sending the frequency point association table to a terminal after the joint attachment is determined to be completed, so that the terminal determines the frequency point information of the second type cell which needs to be returned by the terminal according to the identifier of the first type cell which is currently resident and the frequency point association table when the terminal determines that the voice service in the circuit switched fallback is completed and the terminal does not receive the frequency point information of the second type cell which needs to be returned within a preset time length.
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