CN114040493B - Data bearer establishing method, device, terminal and storage medium - Google Patents
Data bearer establishing method, device, terminal and storage medium Download PDFInfo
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- H—ELECTRICITY
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- H04W76/18—Management of setup rejection or failure
Abstract
The embodiment of the application discloses a data bearer establishing method, a data bearer establishing device, a terminal and a storage medium, and belongs to the technical field of communication. The method comprises the following steps: deregister with the first network in response to receiving rejection information sent by the first network; the rejection information is information for instructing the first network to reject establishment of the additional bearer with the terminal for a first reason; the deregistration with the first network is a process for releasing the registration relationship between the terminal and the cell of the first network; reselecting a registration cell of a first network, and registering with the first network through the reselected registration cell; sending a bearer establishment request to a first network; the bearer establishment request is used for requesting the terminal to establish an additional bearer with the first network. The method and the device avoid the condition that the bearer establishment time is wasted because the next processing is required after the waiting time corresponding to the back-off timer when the additional bearer establishment fails, improve the efficiency of establishing the additional bearer and further improve the efficiency of data transmission.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a method, an apparatus, a terminal, and a storage medium for establishing a data bearer.
Background
When The terminal registers to a 4G (The 4th Generation, fourth Generation mobile communication technology) Network and has successfully established a default PDN (Packet Data Network) bearer with The Network, it may initiate an independent PDN connection request signaling carrying an APN (Access Point Name) designation information to attempt to establish an additional bearer according to a service requirement.
In the related art, the protocol specifies that under the 4G network, the terminal triggers an independent PDN connection request signaling carrying a specified APN, the network may reject the request using PDN connection reject signaling in some cases, and the reject reason carried may be #32or #33. According to the protocol, if the terminal is registered to a Home Public Land Mobile Network (HPLMN) or an Equivalent Home Public Land Mobile Network (EHPLMN), a timer is backed off, and only after the timer is overtime, a new PDN connection request signaling can be initiated to try to establish an additional bearer to the Network, so that the data bearer cannot be established for a long time.
Disclosure of Invention
The embodiment of the application provides a method, a device, equipment and a storage medium for establishing a data bearer, which improve the efficiency of establishing an additional bearer and further improve the efficiency of data transmission. The technical scheme is as follows:
in one aspect, an embodiment of the present application provides a method for establishing a data bearer, where the method is executed by a terminal, and the method includes:
in response to receiving rejection information sent by a first network, deregistering with the first network; the rejection information is information for instructing the first network to reject establishment of an additional bearer with the terminal for a first reason; the deregistration with the first network is a process for releasing the registration relationship between the terminal and the cell of the first network;
reselecting a registration cell of the first network, and registering with the first network through the reselected registration cell;
sending a bearer establishment request to the first network; the bearer establishment request is used for requesting the terminal to establish the additional bearer with the first network.
On the other hand, an embodiment of the present application provides a data bearer establishment apparatus, where the apparatus is used in a terminal, and the apparatus includes:
a deregistration module, configured to deregister with a first network in response to receiving rejection information sent by the first network; the rejection information is information for instructing the first network to reject establishment of an additional bearer with the terminal for a first reason; the deregistration with the first network is a process for releasing the registration relationship between the terminal and the cell of the first network;
the registration module is used for reselecting a registration cell of the first network and registering with the first network through the reselected registration cell;
a request sending module, configured to send a bearer establishment request to the first network; the bearer establishment request is used for requesting the terminal to establish the additional bearer with the first network.
In one possible implementation manner, the registration module includes:
a cell determination submodule configured to determine the registration cell from at least one cell of the first network covering the terminal based on the cell where de-registration is performed.
In one possible implementation manner, the cell determining sub-module includes:
a first determining unit configured to determine the registered cell from cells covering the terminal other than the deregistered cell in response to inclusion of the cells other than the deregistered cell in at least one cell of the first network covering the terminal;
a second determining unit, configured to determine, in response to that no cell other than the cell performing de-registration exists in cells of at least one of the first networks covering the terminal, the cell performing de-registration as the registration cell.
In a possible implementation manner, the terminal includes a mobility management layer and a radio resource control layer; the registration module includes:
a request sending submodule, configured to send, in response to receiving, by the mobility management layer, a cell disabling request to the radio resource control layer through the mobility management layer, the deregistration success information sent by the access network device; the cell forbidding request comprises a cell identifier corresponding to a cell which is successfully unregistered;
the cell shielding submodule is used for shielding the cell which is successfully unregistered through the wireless resource control layer based on the cell identification corresponding to the cell which is successfully unregistered;
and the cell reselection submodule is used for reselecting the registered cell from the unshielded cell through the radio resource control layer.
In one possible implementation, the cell mask submodule includes:
a list generating unit, configured to add a cell identifier corresponding to a cell that is successfully deregistered in the cell barring request to a barring cell list;
the cell reselection submodule, comprising:
and the reselection unit is used for reselecting the registered cell from the cells covering the terminal out of the forbidden cell list through the wireless resource control layer.
In one possible implementation, the apparatus further includes:
and the switching module is used for responding to the times of continuously receiving the rejection information sent by the first network reaching a specified threshold value, and switching the current Radio Access Technology (RAT).
In one possible implementation manner, the switching module includes:
and the switching sub-module is used for responding to the times of continuously receiving the rejection information sent by the first network reaching a specified threshold value, and switching the current Radio Access Technology (RAT) from the fourth generation communication technology to the fifth generation communication technology.
In one possible implementation, the apparatus further includes:
and the service execution module is used for responding to the successful establishment of the additional bearer with the first network and carrying out the voice service based on the IP multimedia system through the additional bearer.
In another aspect, an embodiment of the present application provides a terminal, where the terminal includes a processor and a memory; the memory has stored therein at least one computer instruction that is loaded and executed by the processor to implement the data bearer establishment method as described in the above aspect.
In another aspect, an embodiment of the present application provides a computer-readable storage medium, where at least one computer instruction is stored, and the computer instruction is loaded and executed by a processor to implement the data bearer establishment method according to the foregoing aspect.
According to an aspect of the application, a computer program product or computer program is provided, comprising computer instructions, the computer instructions being stored in a computer readable storage medium. The processor of the terminal reads the computer instructions from the computer-readable storage medium, and executes the computer instructions, so that the terminal executes the data bearer establishment method provided in the various alternative implementations of the above aspect.
The technical scheme provided by the embodiment of the application has the beneficial effects that at least:
after the terminal registers with the first network through the current registration cell, when the terminal requests to establish the additional bearer with the first network and the request for establishing the additional bearer fails, the terminal can perform de-registration with the first network, then reselect the registration cell, register with the first network through the reselected registration cell, and then request again to establish the additional bearer with the first network, thereby avoiding the situation that the next processing is required to be performed after the waiting time corresponding to the back-off timer when the additional bearer is failed to be established, which causes the waste of the bearer establishment time, improving the efficiency of establishing the additional bearer, and further improving the efficiency of data transmission.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 is a block diagram illustrating a communication system in accordance with an exemplary embodiment;
fig. 2 is a flow chart illustrating a method of data bearer establishment in accordance with an example embodiment;
fig. 3 is a flow chart illustrating a data bearer establishment method according to another example embodiment;
FIG. 4 is a flow diagram of a re-registration network to which the embodiment shown in FIG. 3 relates;
fig. 5 is a flow chart of a RAT handover in accordance with the embodiment of fig. 3;
fig. 6 is a flowchart illustrating bearer establishment during VOLTE according to an example embodiment;
fig. 7 is a flowchart of successful IMS data bearer establishment according to the embodiment shown in fig. 6;
fig. 8 is a flow chart of an IMS data bearer establishment failure according to the embodiment shown in fig. 6;
fig. 9 is a flowchart of a terminal performing RAT handover according to the embodiment shown in fig. 6;
fig. 10 is a block diagram of a data bearer setup apparatus according to an exemplary embodiment of the present application;
fig. 11 is a block diagram illustrating a structure of a terminal according to an exemplary embodiment of the present application.
With the foregoing drawings in mind, certain embodiments of the disclosure have been shown and described in more detail below. These drawings and written description are not intended to limit the scope of the disclosed concepts in any way, but rather to illustrate the concepts of the disclosure to those skilled in the art by reference to specific embodiments.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Reference herein to "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
Fig. 1 shows a block diagram of a communication system provided in an exemplary embodiment of the present application, which may include: access network 12, terminal device 14, and core network 16.
Several access network devices 120 are included in access network 12. The access network equipment 120 may be a base station, which is a device deployed in an access network to provide wireless communication functions for terminals. The base stations may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems using different radio access technologies, names of devices having functions of base stations may be different, for example, in an LTE (Long Term Evolution) system, the devices are called enodebs (Evolved Node bs) or enbs for short; in a 5G NR-U (5G New Radio in Unlicensed Spectrum) system, it is called a gsnodeb (5G base station) or a gNB. The description of "base station" may change as communication technology evolves. For convenience of this embodiment, the above-mentioned apparatuses for providing the terminal device 14 with a wireless communication function are collectively referred to as a network device.
The Terminal devices 14 may include various handheld devices, vehicle mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem with wireless communication capabilities, as well as various forms of user equipment, mobile Stations (MSs), terminals (Terminal devices), and so forth. For convenience of description, the above-mentioned devices are collectively referred to as a terminal. Access network device 120 and terminal device 14 communicate with each other over some air interface technology, such as a Uu interface.
The core network 16 is used as the top layer of the mobile communication network to complete routing and exchange of data, and finally, a channel between the end user and the internet is established, and after the channel is established, the end user can access a data center on the internet, that is, a server of a service provider, so as to use services and services provided by the service provider.
The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Long Term Evolution (Long Term Evolution, LTE) System, an LTE Frequency Division Duplex (FDD) System, an LTE Time Division Duplex (TDD) System, an Advanced Long Term Evolution (Advanced Long Term Evolution, LTE-a) System, a New Radio (New Radio, NR) System, an Evolution System of the NR System, an LTE (LTE-based Access to Unlicensed spectrum, LTE-U) System on an Unlicensed band, an NR-U System, a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) Communication System, a Wireless Local Area Network (WLAN), wireless Fidelity (WiFi), a 6 th Generation Mobile Communication technology (6-Generation, 6G) System, a next Generation Communication System, or other Communication systems.
Generally, the conventional Communication system supports a limited number of connections and is easy to implement, however, with the development of Communication technology, the mobile Communication system will support not only conventional Communication but also, for example, device-to-Device (D2D) Communication, machine-to-Machine (M2M) Communication, machine Type Communication (MTC), vehicle-to-Vehicle (V2V) Communication, and Vehicle networking (V2X) system, etc. The embodiments of the present application can also be applied to these communication systems.
Fig. 2 shows a flowchart of a data bearer establishment method according to an exemplary embodiment of the present application. The data bearer establishing method may be performed by a terminal, for example, the terminal may be the terminal device 14 in the communication system shown in fig. 1. The data bearer establishing method comprises the following steps:
In the embodiment of the application, after the terminal has established the default bearer with the first network, the terminal receives the information that the first network refuses to establish the additional bearer with the terminal for the first reason, and the terminal and the first network perform de-registration to release the registration relationship between the terminal and the cell of the first network.
In one possible implementation, the additional bearer is a bearer for transmitting data generated when the terminal performs a call including a multimedia service, and the additional bearer is established between the terminal and a network, the multimedia service including a service in which the terminal performs a voice call with another terminal. The default bearer is a bearer for transmitting data generated when the terminal processes data traffic using the network, and is established between the terminal and the network. The data service includes an internet access service of the terminal.
Wherein the first network may be a network using a fourth generation communication technology, i.e. a 4G network. The first reason may be an independent PDN connection REQUEST signaling (PDN CONNECTIVITY REQUEST) carrying a specified APN triggered by the terminal in the 4G network, or a REJECT reason carried by the network when rejecting the REQUEST using PDN connection REJECT signaling (PDN CONNECTIVITY REJECT) in some cases.
Illustratively, the first reason may include #32 service option supported ", or, #33 requested service option supported", which is a reject reason transmitted when the UE requests a service not supported by the PLMN, and #33 requested service option supported "is a reject reason transmitted when the UE (terminal) requests a service option to which the UE is not subscribed.
The purpose of the default bearer context activation procedure is to establish a default EPS (Evolved Packet System) bearer context between the UE (terminal) and the EPC (4G core network). The default EPS bearer context activation procedure is initiated by the network as a response to the PDN CONNECTIVITY REQUEST message from the UE.
In a possible implementation manner, the terminal registers to the first network through the access network device, and a cell corresponding to the access network device is a current registered cell of the terminal.
The access network device may be a base station, the cell may be the smallest area unit in the mobility management, the coverage area of the communication network signal through the antenna may be divided into various areas, and a plurality of user terminals may access and communicate in each area.
For example, the effective coverage distance of the base station may be a distance at which the terminal supports receiving the signal and simultaneously can transmit the signal to the base station, and if the effective coverage distance of the base station is 10km, a circular range with the base station as a center of circle and 10km as a radius may be a cell formed by network coverage of the base station.
In the embodiment of the application, the terminal reselects the registration cell of the first network, and the terminal registers with the reselected registration cell of the first network.
In a possible implementation manner, the terminal performs registration by selecting a cell previously registered by the first network or another cell except the previously registered cell as a registration cell of the first network.
For example, after the terminal has previously registered with the cell of the first network, because the terminal receives the rejection information of the first network, the terminal de-registers with the cell of the first network and then re-registers with the first network, when the terminal excludes the base station corresponding to the cell which has performed the past registration, there are base stations at which other signals can cover the terminal, the cell corresponding to the base station where signals can cover the terminal can be used as the cell suitable for the terminal to register, and one of the cells suitable for the terminal to register can be selected as the cell currently registered with the first network.
If the cells suitable for the terminal to register include at least two cells, one of the cells suitable for the terminal to register may be selected as a registration cell according to the strength of signals received by the terminal.
In this embodiment, the terminal may send a bearer establishment request to the first network to request the terminal to establish an additional bearer with the first network through the registration cell.
In a possible implementation manner, the terminal sends a bearer establishment request to the first network through the access network device corresponding to the current registration cell, and requests the terminal to establish an additional bearer with the first network through the registration cell.
If the terminal still receives the rejection information sent by the first network after sending the bearer establishment request to the first network through the access network device corresponding to the target cell, the contents of step 201 and step 202 may be repeatedly executed until the terminal successfully establishes the additional bearer with the first network through the registration cell.
For example, if the terminal still receives the rejection information sent by the first network after sending the bearer establishment request to the first network through the access network device corresponding to the target cell, the contents of step 201 and step 202 may be repeatedly executed, and the additional bearer is sequentially tried to be established between the cell suitable for the terminal to register and the first network until the terminal successfully establishes the additional bearer between the registered cell and the first network or the additional bearer is tried to be established between the cell suitable for the terminal to register and the first network.
To sum up, in the embodiment of the present application, after the terminal registers with the first network through the current registration cell, when the terminal requests to establish the additional bearer with the first network and the request for establishing the additional bearer fails, the terminal may perform deregistration with the first network, then reselect the registration cell, perform registration with the first network through the reselected registration cell, and then request again to establish the additional bearer with the first network, thereby avoiding a situation that the next processing is required after waiting time corresponding to the back-off timer when the additional bearer is failed to establish, which results in wasted bearer establishment time, improving efficiency of establishing the additional bearer, and further improving efficiency of data transmission.
Fig. 3 is a flowchart illustrating a data bearer establishment method according to an exemplary embodiment of the present application. The data bearer establishing method may be performed by a terminal, for example, the terminal may be the terminal device 14 in the communication system shown in fig. 1. The data bearer establishing method comprises the following steps:
In this embodiment, when the terminal receives rejection information sent by the first network after requesting to establish an additional bearer with the first network through the current registration cell, the terminal may release the registration relationship between the terminal and the current registration cell of the first network.
The reject information may be information for instructing the first network to reject establishing the additional bearer with the terminal for a first reason; deregistration with the first network may be a procedure for deregistering the terminal with the current registered cell of the first network.
In a possible implementation manner, after the terminal registers with the cell of the first network, the terminal initiates an additional bearer establishment request to the first network through the registration cell, after the first network receives the additional bearer establishment request, the first network returns rejection information including a rejection reason to the terminal, and the terminal initiates de-registration to the current registration cell of the first network to release the registration relationship between the terminal and the cell of the first network.
In this embodiment of the present application, the terminal may obtain, through signal search, each signal that may be received by the current location of the terminal and is transmitted by the access network device, and reselect the registration cell from the cells corresponding to the access network device, that is, when the terminal is located within the signal coverage of each access network device, the terminal may determine the reselected registration cell from the cells corresponding to each access network device.
In one possible implementation, in response to a cell other than the cell where deregistration is performed being included in the cells of the at least one first network covering the terminal, determining a registered cell from the cells covering the terminal other than the cell where deregistration is performed; and determining the cell for de-registration as a registered cell in response to the cell except the cell for de-registration not existing in the cells of the at least one first network covering the terminal.
That is, after the terminal performs signal search, if it is determined that the cell corresponding to the access network device that can be connected includes other cells except for the previous registered cell, one of the other cells is selected as the reselected registered cell. If it is determined that there is only one access network device that can be connected and the cell corresponding to the access network device is the previous registered cell, the previous registered cell is continuously selected as the registered cell. Because the network registration is carried out again by replacing the cell after the additional bearer is failed to be established, the terminal can be accessed into the core networks in different areas, and the success rate of the additional bearer establishment can be improved.
For example, taking an independent PDN connection with an additional bearer as an IMS (IP Multimedia Subsystem), when a terminal fails to establish an independent PDN connection of the IMS using a first cell, the terminal may use another cell except the first cell to establish an independent PDN connection of the IMS, and since a different cell is replaced in the process of establishing an independent PDN connection of the IMS again, the terminal may access to a core network in a different area, so that a success rate of establishing an independent PDN connection of the IMS may be increased.
In one possible implementation manner, the terminal includes at least one of a Session Management (SM), a Mobility Management (MM), and a Radio Resource Control (RRC) layer.
The session management layer may be configured to manage bearer establishment between the terminal and the first network, the mobility management layer may be configured to solve a network connection problem caused by mobility of the terminal, and the radio resource control layer may be configured to screen a cell allocated to the terminal for access.
In a possible implementation manner, when the terminal includes a mobility management layer and a radio resource control layer, in response to receiving the successful de-registration information sent by the access network device, the mobility management layer sends a cell disabling request to the radio resource control layer; shielding the successfully unregistered cell through a radio resource control layer based on the cell identifier corresponding to the successfully unregistered cell; and reselecting the registered cell from the unmasked cell through a radio resource management layer.
The cell disable request may include a cell identifier corresponding to a cell in which deregistration is successful. The cell disable request may be a request sent by the session management layer to the mobility management layer to disable the cell for which registration is successful.
Illustratively, when a mobility management layer of a terminal receives information of an additional bearer establishment failure returned by a first network, the mobility management layer sends a signaling of the additional bearer establishment failure to a session management layer according to the received information of the additional bearer establishment failure, so that the session management layer sends a request for preventing a cell which succeeds in deregistration from registering to the mobility management layer, the mobility management layer receives the request and sends a cell disabling request carrying a cell identifier corresponding to the cell which succeeds in deregistration to a radio resource control layer, the radio resource control layer receives the request for disabling the cell which succeeds in deregistration and reselects a registered cell, the signaling carrying a reselection result is returned to the mobility management layer through the radio resource control layer, meanwhile, the mobility management layer sends the signaling carrying the reselection result to the session management layer, and the session management layer sends the registration request to an access network device corresponding to the reselected registered cell through the mobility management layer according to the reselection result.
In a possible implementation manner, the terminal adds a cell identifier corresponding to a cell which is successfully unregistered in the cell forbidden request to a forbidden cell list; and reselecting a registered cell from the cells covering the terminal out of the forbidden cell list through a radio resource control layer.
The radio resource control layer adds the cell identifier to the forbidden cell list according to the received cell identifier corresponding to the cell with successful de-registration, and the radio resource control layer can reselect the registered cell from the cells covering the terminal out of the forbidden cell list according to the forbidden cell list and return the reselection result to the mobile management layer, wherein the reselection result comprises the cell identifier of the reselected registered cell.
For example, when the terminal requests that the additional bearer with the first network is failed to be established, the first network returns information that the additional bearer is failed to be established to the terminal, the terminal may obtain a cell identifier corresponding to a cell that has just been deregistered, and generate a cell barring request including the cell identifier, the terminal may generate a barred cell list based on the cell barring request, where the barred cell list may include cells that have been successfully deregistered in an attempt to establish the additional bearer, the terminal shields cells in the barred cell list, and determines a registration cell of the reselected first network from the unshielded cells. The forbidden cell list may include a cell identifier of a cell corresponding to an access network device to which the terminal is connected when the additional bearer establishment fails all the time.
In the embodiment of the application, the terminal may register with the first network through the reselected registration cell.
In a possible implementation manner, the terminal sends a registration request to the mobility management layer through the session management layer, sends the registration request to the first network through the mobility management layer, and registers with the first network through a reselected registration cell according to the received registration request.
After the terminal registers with the first network through the reselected registration cell, the first network can send registration success information to a mobility management layer of the terminal through access network equipment corresponding to the registration cell, and the mobility management layer sends the registration success information to a session management layer, so that a default bearer can be established between the terminal and the first network.
In the embodiment of the application, the terminal sends a bearer establishment request to the first network to request the terminal to establish an additional bearer with the first network.
The bearer establishment request may be used to request the terminal to establish an additional bearer with the first network.
In a possible implementation manner, when the terminal receives the registration success information sent by the first network through the registration cell, the terminal sends a bearer establishment request to the first network through the registration cell to request the terminal to establish an additional bearer with the first network.
When a session management layer of the terminal receives registration success information sent by the first network through the registration cell, the session management layer in the terminal can send an independent PDN connection request carrying an APN (Internet protocol address name) of IMS to the first network through the mobile management layer, and requests the terminal to establish IMS data bearer with the first network.
Fig. 4 is a flowchart of a network re-registration according to an embodiment of the present application. As shown in fig. 4, after the network rejects the standalone PDN connection request with APN IMS for the reason #32or #33, in order not to use the back-off timer mechanism, the following steps may be performed:
and S41, the terminal executes a deregistration process.
The terminal can initiate a de-registration process through the session management layer, and the network can successfully complete the de-registration process by receiving the request. The session may be a channel for data transmission and the elements of the session may be PDN, bearer or IP streaming elements.
S42, the terminal forbids the current cell which is successfully registered as the service cell for registering next time, and reselects a new cell for registering.
After the terminal and the first network successfully register, a session management layer in the terminal can inform a radio resource control layer through a mobile management layer in the terminal, the terminal prohibits a cell which is successfully registered currently from being used as a service cell for registration next time, reselects a new cell for registration, and can continue to use the cell which is successfully registered currently for registration again when the radio resource control layer does not find other suitable cells. If the cell is temporarily barred, the radio management module may set a special temporary cell barring list to store the current cell identity. The success rate of additional bearing establishment retry can be improved by forbidding the current cell which is successfully unregistered and reselecting a new cell for registration.
And S43, the terminal re-registers to the 4G network through the reselected registration cell.
After the terminal determines the reselected registration cell, the terminal can initiate registration to the 4G network again through the session management layer, and after the registration with the 4G network is successful, the terminal establishes a default bearer with the 4G network through the session management layer.
S44, the terminal sends an independent PDN connection request carrying APN as IMS through the registration cell, and tries to establish IMS data bearing with the network.
When the default bearer is successfully established, the session management layer may initiate an independent PDN connection establishment request carrying an APN that is IMS to the 4G network.
S45, if the IMS data bearer is successfully established, the session management layer in the terminal informs the radio resource control layer to clear the cell identifier in the cell forbidden list through the mobile management layer in the terminal.
After IMS data bearer is successfully established, the terminal can initiate IMS network registration through a high layer, and start a VOLTE function to realize multimedia voice service.
S46, if the IMS data bearer is failed to be established, the terminal receives the reject information with the reject reason #32or #33 returned by the first network, and the terminal continues to repeat steps S41 to S44.
If the above steps S41 to S44 are repeated twice, the first network rejects the interrupt request by using the reason #32or #33, and the terminal switches the RAT.
In the embodiment of the application, when the number of times of failure of request for establishing additional bearer with the first network by replacing the target cell reaches a specified threshold, the terminal may switch the currently used radio access technology RAT.
In one possible implementation, the current radio access technology RAT is switched from the fourth generation communication technology to the fifth generation communication technology in response to the number of consecutive receptions of the rejection information sent by the first network reaching a specified threshold.
Illustratively, by replacing the registration cell, the additional bearer may be requested to be established with the first network by the registration cell multiple times, and when the number of times of requesting to establish the additional bearer is greater than a specified threshold, the terminal may request to establish the additional bearer with the 4G network, and may be switched to perform the additional bearer establishment with the 5G network by the request, so that the establishment of the additional request is successful.
In one possible implementation, when the above re-registration and re-establishment of the IMS data bearer is completed, the IMS data bearer request is still rejected by the network for the reason #32or #33, and the Voice call mode selected by the terminal is decided according to the operating mode of the terminal and the Voice Domain Preference (Voice Domain Preference) described in the protocol 3gpp TS 24.301 4.3.
When The terminal is set to PS mode 1 and CS/PS mode 1 needs to be converted, the voice call execution CSFB (Circuit Switch Fallback) falls back to The 2nd Generation network or The 3G network.
The voice call is executed in the 2G network or the 3G network, so that the call establishment process is slow, the circuit domain call cannot provide high-quality voice, and meanwhile, in the call process, data service transmission may be influenced, so that the user experience is influenced.
Wherein, when the terminal is set to PS mode 2, the CS/PS mode 2 needs to be converted, and the steps shown in FIG. 4 are executed subsequently. When the terminal is set to CS/PS mode 1 or CS/PS mode 2, the steps shown in FIG. 4 can be executed subsequently. If the 4G network registration through the CS circuit domain fails, if the terminal needs to ensure the function of the voice call at the moment, the terminal needs to forbid the 4G network and switch to the 2G, 3G or 5G network to try to recover the function of the voice call. In order to improve user experience, if the terminal has started the 5G network, the terminal may preferentially switch to the 5G network for registration, and attempt to establish an IMS data bearer with the 5G network.
In a possible implementation manner, if the terminal supports the use of a 5G network, the terminal includes a 4G session management layer, a 4G mobility management layer, and a 5G session management layer.
Fig. 5 is a flowchart of RAT handover according to an embodiment of the present disclosure. As shown in fig. 5, the following steps may be performed:
s51, the terminal sends a request carrying Initial Registration information (Initial Registration) to a 4G mobile management layer of the terminal through the 4G session management layer, and the request is switched to a 5G network.
And S52, if the terminal fails to switch to the 5G network through the 4G mobile management layer, the terminal high layer executes subsequent actions according to the protocol.
If the 4G mobility management layer rejects to switch to the 5G network or rejects to switch to the 5G network due to the fact that the bottom layer of the terminal cannot successfully reside in the 5G cell, the 4G session management layer may notify the higher layer IMS of the failure of establishing the data bearer and the reason of the failure, and the higher layer will perform subsequent actions according to the protocol.
And S53, if the terminal can be successfully switched to the 5G network through the 4G mobile management layer, the 5G session management layer requests to establish data bearer of PDU of IMS with the 5G network.
The terminal receives a request for switching to the 5G network through the 4G mobile management layer, and the bottom layer of the terminal can successfully reside in the 5G cell. The 4G Session management layer may notify the 5G Session management layer to request establishment of an IMS data bearer with the 5G network, and may request establishment of a PDU data channel (PDU Session) of the IMS after the 5G protocol stack is successfully registered with the network.
And step 306, responding to the successful establishment of the additional bearer with the first network, and carrying out the voice service based on the IP multimedia system through the additional bearer.
In the embodiment of the application, after the terminal and the additional bearer of the first network are successfully established, the voice service based on the IMS in the terminal can be started to perform the voice call.
The scheme is a Voice call solution performed by both the IMS and the LTE, so that the terminal user can perform Voice call and internet access functions at the same time, and the scheme is a VOLTE (Voice Over LTE,4G traffic Voice call) function.
That is, for the network to reject the standalone PDN connection request carrying APN of IMS for reason #32or #33, the terminal may first not start the back-off timer, but may perform the steps of re-registering the 4G network with two chances and then initiating the standalone PDN connection request with APN of IMS, and may camp on using a different cell each time, thereby improving the success rate of PDN establishment. If the two retries fail and the failure reason is still that the #32or the #33,4g session management layer can try to request to register the 5G network, if the registration succeeds, the PDU additional bearer of the IMS can be requested to be established, so that the terminal user can work on the high-speed network as much as possible, the experience of the terminal user on high-quality voice call and high-speed data transmission is provided, and meanwhile, the situation that the VOLTE voice function cannot be used in the waiting time due to the starting of the back-off timer is avoided, and the experience of the terminal user on the VOLTE voice function is improved.
To sum up, in the embodiment of the present application, after the terminal registers with the first network through the current registration cell, when the terminal requests to establish the additional bearer with the first network and the request fails to establish the additional bearer, the terminal may perform de-registration with the first network, then reselect the registration cell, perform registration with the first network through the reselected registration cell, and then request again to establish the additional bearer with the first network, thereby avoiding a situation that the additional bearer establishment time is wasted due to the fact that the next processing is required after the waiting time corresponding to the back-off timer when the additional bearer establishment fails, improving the efficiency of establishing the additional bearer, and further improving the efficiency of data transmission.
Taking the application of the scheme for establishing the data bearer in the VOLTE process as an example, fig. 6 shows a schematic flow diagram for establishing the bearer in the VOLTE process according to an exemplary embodiment of the present application. As shown in fig. 6, the terminal is registered to the 4G network and has successfully established a default PDN bearer with the network, but the 4G network rejects the independent PDN connection request with APN IMS for reasons #32 and #33. In response to the session management layer 61 of the terminal receiving the reject information of the reasons #32 and #33, transmitting a deregistration request (SM _ Detach _ Req) to the mobility management layer 62 in the terminal, the mobility management layer 62 transmitting the deregistration request (Detach _ Req) to the 4G network 64, the 4G network 64 performing a deregistration procedure after receiving the deregistration request, and returning a deregistration success information (Detach _ Accept) to the mobility management layer 62, the mobility management layer 62 transmitting a Detach signaling (SM _ Detach _ Cnf) to the session management layer 61, the session management layer 61 generating and transmitting a Cell disable request (SM _ Block _ Cell _ Req) to the mobility management layer 62 based on the received Detach signaling, the mobility management layer 62 transmitting the Cell disable request (MM _ Block _ Cell _ Req) to the radio resource control layer 63, the radio resource control layer 63 disabling the Cell based on the received Cell request, receiving a request for forbidding the Cell, the radio resource control layer 63 determining the Cell identifier which needs to be masked currently according to the Cell forbidding request, generating a temporary forbidden Cell list, and the radio resource control layer 63 sending a reselection result signaling (MM _ Block _ Cell _ Cnf) to the mobility management layer 62, wherein the reselection result signaling may carry the reselected registered Cell identifier, the mobility management layer 62 sending a reselection result signaling (SM _ Block _ Cell _ Cnf) to the session management layer 61, the session management layer 61 in the terminal sending a registration request (SM _ Attach _ Req) to the mobility management layer 62 after receiving the reselection result signaling, the mobility management layer 62 sending a registration request (Attach _ Req) to the 4G network 64, the 4G network 64 receiving the registration request and establishing a default bearer between the terminal and the 4G network 64, the 4G network returns the successful registration information (Attach _ Accept) to the mobility management layer 62, the mobility management layer 62 sends a signaling (SM _ Attach _ Cnf) carrying the successful registration information to the session management layer 61, the session management layer 61 sends an independent PDN setup connection Request (SM _ PDN _ Est _ Req with APN = IMS) carrying the APN IMS to the mobility management layer 62, and the mobility management layer 62 initiates an IMS data bearer setup Request (PDN _ Connectivity _ Request) to the 4G network 64.
Requesting the establishment of an IMS data bearer may include two cases. Fig. 7 is a flowchart of successful IMS data bearer establishment according to an embodiment of the present application. As shown in fig. 7, the 4G network 64 receives a PDN setup IMS data bearer request, the 4G network 64 returns information that IMS data bearer setup is successful to the mobility management layer 62, the mobility management layer 62 sends a connection signaling (SM _ PDN _ Est _ Cnf with APN = IMS) to the session management layer 61, additional bearer setup between the terminal and the 4G network is completed, meanwhile, the session management layer 61 sends a request for forbidden list cleaning (SM _ Clear _ Cell _ Req) to the radio resource control layer 63 through the mobility management layer 62, the radio resource control layer 63 deletes a Cell identifier in the temporary Cell forbidden list according to the received request to remove shielding of a Cell, and then the radio resource control layer 63 sends a cleaning completion signaling (SM _ Clear _ Cell _ Cnf) to the session management layer 61 through the mobility management layer 62.
Fig. 8 is a flowchart of an IMS data bearer establishment failure according to an embodiment of the present application. As shown in fig. 8, after the 4G network 64 REJECTs the PDN setup IMS data bearer request, the 4G network 64 sends an additional bearer setup failure message (PDN _ Connectivity ITY _ REJECT with its ESM cause #32or # 33) carrying the rejection reason to the mobility management layer 62, the mobility management layer 62 sends an additional bearer setup request (SM _ PDN _ Est _ Rej with its ESM cause #32or # 33) carrying the rejection reason to the session management layer 61, if the IMS data bearer setup fails, the network still uses the rejection reason #32or #33, the terminal will continue to repeat the steps in fig. 6, if the IMS data bearer setup has been repeated twice, the network always REJECTs the terminal request using the reason #32or the reason #33, the terminal will perform the RAT handover procedure, thereby further restoring the voice call function.
Exemplarily, fig. 9 is a flowchart of a terminal performing RAT handover according to an embodiment of the present application. As shown in fig. 9, when the terminal fails To reestablish the IMS data bearer by replacing the cell, the terminal starts To perform the step of switching To the 5G network and attempts To establish the IMS data bearer, the terminal sends an initial registration request of 5G (SM _ Reg _ To _5g _req) To the 4G mobility management layer 93 through the 4G session management layer 92, in a case where the 4G network fails To switch To the 5G network, in this case, the 4G mobility management layer 93 rejects switching To the 5G network or the terminal bottom layer fails To camp on the 5G cell, the 4G mobility management layer sends initial registration failure information (SM _ Reg _ To _5g _req) To the 4G session management layer 92, and the 4G session management layer 92 sends connection information (PDN _ Est _ Rej with APN = IMS) To the terminal upper layer, so that the upper layer can perform subsequent actions as specified by the protocol. In another case, the 4G network successfully switches To the 5G network, in which case the 4G mobility management layer 93 accepts the request for switching To the 5G network and the terminal underlay may successfully camp on the 5G cell, the 4G mobility management layer 93 sends an initial registration success signaling (SM _ Reg _ To _5g _ rej) To the 4G session management layer 92, and the 4G session management layer 92 sends connection information (SM _ Est _ PDN _ Req with APN = IMS) To the 5G session management layer 94, so that the 5G session management layer 94 successfully registers the 5G network according To the received connection information and attempts To establish an IMS data bearer with the 5G network.
To sum up, in the embodiment of the present application, after the terminal registers with the first network through the current registration cell, when the terminal requests to establish the additional bearer with the first network and the request for establishing the additional bearer fails, the terminal may perform deregistration with the first network, then reselect the registration cell, perform registration with the first network through the reselected registration cell, and then request again to establish the additional bearer with the first network, thereby avoiding a situation that the next processing is required after waiting time corresponding to the back-off timer when the additional bearer is failed to establish, which results in wasted bearer establishment time, improving efficiency of establishing the additional bearer, and further improving efficiency of data transmission.
Fig. 10 shows a block diagram of a data bearer setup apparatus according to an exemplary embodiment of the present application. The data bearer establishing device is used in a terminal, and comprises:
a deregistration module 1010, configured to deregister with a first network in response to receiving rejection information sent by the first network; the rejection information is information for instructing the first network to reject establishment of an additional bearer with the terminal for a first reason; the deregistration with the first network is a process for releasing the registration relationship between the terminal and the cell of the first network;
a registration module 1020, configured to reselect a registration cell of the first network and register with the first network through the reselected registration cell;
a request sending module 1030, configured to send a bearer establishment request to the first network; the bearer establishment request is used for requesting the terminal to establish the additional bearer with the first network.
In a possible implementation manner, the registration module 1020 includes:
a cell determining submodule configured to determine the registered cell from at least one cell of the first network covering the terminal based on a cell for performing de-registration.
In one possible implementation, the cell determining sub-module includes:
a first determining unit configured to determine the registered cell from cells covering the terminal other than the deregistered cell in response to inclusion of the cells other than the deregistered cell in at least one cell of the first network covering the terminal;
a second determining unit, configured to determine, in response to that no cell other than the cell performing de-registration exists in cells of at least one of the first networks covering the terminal, the cell performing de-registration as the registration cell.
In a possible implementation manner, the terminal includes a mobility management layer and a radio resource control layer; the registration module 1020 includes:
a request sending submodule, configured to send, in response to receiving, by the mobility management layer, a cell disabling request to the radio resource control layer through the mobility management layer, the deregistration success information sent by the access network device; the cell forbidding request comprises a cell identifier corresponding to a cell which is successfully unregistered;
the cell shielding submodule is used for shielding the cell with successful de-registration through the wireless resource control layer based on the cell identification corresponding to the cell with successful de-registration;
and the cell reselection submodule is used for reselecting the registered cell from the unshielded cell through the radio resource control layer.
In one possible implementation, the cell mask submodule includes:
a list generating unit, configured to add a cell identifier corresponding to a cell that is successfully deregistered in the cell barring request to a barring cell list;
the cell reselection submodule, comprising:
and the reselection unit is used for reselecting the registered cell from the cells covering the terminal out of the forbidden cell list through the wireless resource control layer.
In one possible implementation, the apparatus further includes:
and the switching module is used for responding to the times of continuously receiving the rejection information sent by the first network reaching a specified threshold value, and switching the current Radio Access Technology (RAT).
In one possible implementation manner, the switching module includes:
and the switching sub-module is used for responding to the times of continuously receiving the rejection information sent by the first network reaching a specified threshold value, and switching the current Radio Access Technology (RAT) from the fourth generation communication technology to the fifth generation communication technology.
In one possible implementation, the apparatus further includes:
and the service execution module is used for responding to the successful establishment of the additional bearer with the first network and carrying out the voice service based on the IP multimedia system through the additional bearer.
To sum up, in the embodiment of the present application, after the terminal registers with the first network through the current registration cell, when the terminal requests to establish the additional bearer with the first network and the request fails to establish the additional bearer, the terminal may perform de-registration with the first network, then reselect the registration cell, perform registration with the first network through the reselected registration cell, and then request again to establish the additional bearer with the first network, thereby avoiding a situation that the additional bearer establishment time is wasted due to the fact that the next processing is required after the waiting time corresponding to the back-off timer when the additional bearer establishment fails, improving the efficiency of establishing the additional bearer, and further improving the efficiency of data transmission.
Fig. 11 is a block diagram illustrating a structure of a terminal according to an exemplary embodiment of the present application. The terminal may be an electronic device installed and running with an application, such as a smart phone, a tablet computer, an electronic book, a portable personal computer, and the like. A terminal in the present application may include one or more of the following components: a processor 1110, a memory 1120, and a screen 1130.
The Memory 1120 may include a Random Access Memory (RAM) or a Read-Only Memory (Read-Only Memory). Optionally, the memory 1120 includes a non-transitory computer-readable medium. The memory 1120 may be used to store instructions, programs, code, sets of codes, or sets of instructions. The memory 1120 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for implementing at least one function (such as a touch function, a sound playing function, an image playing function, and the like), instructions for implementing the above method embodiments, and the like, and the operating system may be an Android (Android) system (including a system based on Android system depth development), an IOS system developed by apple corp (including a system based on IOS system depth development), or other systems. The data storage area can also store data (such as a phone book, audio and video data, chat record data) created by the terminal in use and the like.
The screen 1130 may be a capacitive touch display screen for receiving a touch operation of a user thereon or nearby using any suitable object such as a finger, a stylus, or the like, and displaying a user interface of each application. The touch display screen is generally provided at a front panel of the terminal. The touch display screen may be designed as a full-face screen, a curved screen, or a profiled screen. The touch display screen can also be designed to be a combination of a full-face screen and a curved-face screen, and a combination of a special-shaped screen and a curved-face screen, which is not limited in the embodiment of the present application.
In addition, those skilled in the art will appreciate that the configurations of the terminals illustrated in the above-described figures do not constitute limitations on the terminals, as the terminals may include more or less components than those illustrated, or some components may be combined, or a different arrangement of components may be used. For example, the terminal further includes a radio frequency circuit, a shooting component, a sensor, an audio circuit, a Wireless Fidelity (WiFi) component, a power supply, a bluetooth component, and other components, which are not described herein again.
The embodiment of the present application further provides a computer-readable storage medium, where at least one computer instruction is stored in the computer-readable storage medium, and the at least one computer instruction is loaded and executed by a processor to implement the data bearer establishment method according to the above embodiments.
According to an aspect of the application, there is provided a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the terminal reads the computer instructions from the computer-readable storage medium, and executes the computer instructions, so that the terminal executes the data bearer establishment method provided in the various alternative implementations of the above aspect.
Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in the embodiments of the present application may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable storage medium. Computer-readable storage media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (11)
1. A method for establishing a data bearer, the method being performed by a terminal, the method comprising:
in response to receiving rejection information sent by a first network, deregistering with the first network; the rejection information is information for instructing the first network to reject establishment of an additional bearer with the terminal for a first reason; the deregistration with the first network is a process for releasing the registration relationship between the terminal and the cell of the first network;
reselecting a registration cell of the first network, and registering with the first network through the reselected registration cell;
sending a bearer establishment request to the first network; the bearer establishment request is used for requesting the terminal to establish the additional bearer with the first network.
2. The method of claim 1, wherein reselecting the registered cell of the first network comprises:
re-determining the registered cell from at least one cell of the first network covering the terminal based on the cell where de-registration is performed.
3. The method of claim 2, wherein the determining the registered cell from the cells of at least one of the first networks covering the terminal based on the cell performing the de-registration comprises:
determining the registered cell from the cells covering the terminal except the cell for deregistration in response to the cells except the cell for deregistration being included in the cells covering at least one of the first networks of the terminal;
determining the cell for deregistration as the registered cell in response to the absence of cells other than the cell for deregistration from the cells of at least one of the first networks covering the terminal.
4. The method of claim 1, wherein the terminal comprises a mobility management layer and a radio resource control layer; the reselecting a registered cell of the first network includes:
responding to the mobile management layer receiving the de-registration success information sent by the access network equipment, and sending a cell forbidding request to the radio resource control layer through the mobile management layer; the cell forbidding request comprises a cell identifier corresponding to a cell which is successfully unregistered;
shielding the successfully unregistered cell through the radio resource control layer based on the cell identifier corresponding to the successfully unregistered cell;
reselecting the registered cell from an unshielded cell through the radio resource control layer.
5. The method of claim 4, wherein the masking the cell with successful de-registration through the radio resource control layer based on the cell identifier corresponding to the cell with successful de-registration comprises:
adding the cell identifier corresponding to the cell which is successfully unregistered in the cell forbidden request to a forbidden cell list;
the reselecting the registered cell from the unshielded cell through the radio resource control layer comprises:
and reselecting the registered cell from the cells covering the terminal out of the forbidden cell list through the wireless resource control layer.
6. The method of claim 1, further comprising:
switching a current radio access technology, RAT, in response to a number of consecutive receptions of the rejection information sent by the first network reaching a specified threshold.
7. The method of claim 6, wherein switching the current Radio Access Technology (RAT) in response to the number of consecutive receptions of the rejection information sent by the first network reaching a specified threshold comprises:
and switching the current Radio Access Technology (RAT) from the fourth generation communication technology to the fifth generation communication technology in response to the number of times the rejection information sent by the first network is continuously received reaching a specified threshold.
8. The method of claim 1, further comprising:
in response to the additional bearer establishment with the first network being successful, conducting voice traffic over an internet protocol, IP, multimedia system over the additional bearer.
9. An apparatus for establishing a data bearer, wherein the apparatus is used in a terminal, and the apparatus comprises:
a deregistration module, configured to deregister with a first network in response to receiving rejection information sent by the first network; the rejection information is information for instructing the first network to reject establishment of an additional bearer with the terminal for a first reason; the deregistration with the first network is a process for releasing the registration relationship between the terminal and the cell of the first network;
the registration module is used for reselecting a registration cell of the first network and registering with the first network through the reselected registration cell;
a request sending module, configured to send a bearer establishment request to the first network; the bearer establishment request is used for requesting the terminal to establish the additional bearer with the first network.
10. A terminal, characterized in that the terminal comprises a processor and a memory; the memory has stored therein at least one computer instruction that is loaded and executed by the processor to implement the data bearer establishment method of any one of claims 1 to 8.
11. A computer-readable storage medium having stored thereon at least one computer instruction, which is loaded and executed by a processor to implement the data bearer establishment method according to any one of claims 1 to 8.
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