CN113630831A - Cell fallback method, terminal and network side equipment - Google Patents
Cell fallback method, terminal and network side equipment Download PDFInfo
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- CN113630831A CN113630831A CN202111086851.9A CN202111086851A CN113630831A CN 113630831 A CN113630831 A CN 113630831A CN 202111086851 A CN202111086851 A CN 202111086851A CN 113630831 A CN113630831 A CN 113630831A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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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
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
Abstract
The application discloses a cell fallback method, a terminal and network side equipment, and relates to the technical field of communication. The method comprises the following steps: acquiring fallback cell configuration information configured by network side equipment under the condition that joint attachment is determined to be completed; determining the information of a cell to be dropped corresponding to the current terminal according to the configuration information of the dropped cell; acquiring a fallback indication, wherein the fallback indication is used for indicating the cell information of the current terminal fallback; and returning to the cell to be dropped according to the drop indication and the cell to be dropped information. Reducing the range of the fallback cells needing to be screened by the terminal through the configuration information of the fallback cells; on the basis of the pre-configured fallback cell configuration information, the cells which are possible to fallback to the current terminal are screened, the measurement of the fallback cells is not needed when a paging request is received, the information processing amount of the terminal is reduced, and the screening efficiency of the terminal on the fallback cell information is improved; and directly falling to the cell to be fallen back through the falling indication, and shortening the time of the terminal falling to the cell to be fallen back.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a cell fallback method, a terminal, and a network side device.
Background
At present, when it is determined that the position of a Mobile terminal in an idle state exceeds a preset control range, the Mobile terminal needs TO send a Tracking Area Update (TAU) TO a Mobile Management Entity (MME) TO a network side device, but when it is determined that the MME cannot respond TO the Mobile terminal due TO resource limitation, the Mobile terminal enters an Update-TO-Update (ATTEMPTING-TO-Update) state, and the Mobile terminal cannot send user data at this time; if it is determined that the Tracking Area (TA) of the serving cell of the mobile terminal has changed and the current serving cell is not in the forbidden TA list, the mobile terminal continues to transmit the TAU to the MME.
In addition, the mobile terminal in the ATTEMPTING-TO-UPDATE state needs TO measure all cells TO obtain the target fallback cell by screening from multiple measurement results, so that the fallback time is too long, normal communication with other terminals cannot be performed, and the user experience is reduced.
Disclosure of Invention
Therefore, the cell fallback method, the terminal and the network side device are provided, and the problems of how to determine the cell to which the terminal needs to fall back and how to shorten the fall back time of the terminal are solved.
In order to achieve the above object, a first aspect of the present application provides a cell fallback method, including: acquiring fallback cell configuration information configured by network side equipment under the condition that joint attachment is determined to be completed; determining the information of a cell to be dropped corresponding to the current terminal according to the configuration information of the dropped cell; acquiring a fallback indication, wherein the fallback indication is used for indicating the cell information of the current terminal fallback; and returning to the cell to be dropped according to the drop indication and the cell to be dropped information.
In some implementations, the fallback cell configuration information includes a plurality of configured cell information; determining the information of the cell to be dropped corresponding to the current terminal according to the configuration information of the cell to be dropped, wherein the determining comprises the following steps: measuring cells in the information of the configured cells to obtain information of a plurality of first cells to be selected, wherein the information of the first cells to be selected comprises the signal quality of the first cells to be selected, and the quantity of the information of the first cells to be selected is less than or equal to that of the information of the configured cells; sequencing the information of the plurality of first cells to be selected according to the signal quality of the first cells to be selected to obtain a sequencing result; and determining the information of the cell to be fallen back corresponding to the current terminal according to the sequencing result.
In some specific implementations, before determining, according to the sorting result, information of a cell to be dropped corresponding to the current terminal, the method further includes: acquiring real-time position information of a current terminal; measuring a cell corresponding to the current terminal according to the real-time position information to obtain a plurality of pieces of second cell information to be selected, wherein the second cell information to be selected comprises the signal quality of the second cell to be selected; and screening the information of the plurality of second cells to be selected according to the signal quality of the second cells to be selected to obtain a screening result.
In some specific implementations, determining information of a cell to be dropped corresponding to a current terminal according to a sorting result includes: comparing the screening result with the sorting result, and determining information of a plurality of third cells to be selected, wherein the information of the third cells to be selected comprises the signal quality of the third cells to be selected, and the signal quality of the third cells to be selected is greater than a preset signal quality threshold; and determining the information of the cell to be fallen back according to the information of the third cells to be selected, wherein the information of the cell to be fallen back comprises the signal quality of the cell to be fallen back, and the signal quality of the cell to be fallen back is superior to the signal quality of other cells to be selected.
In some implementations, the information of the cell to be dropped includes: frequency point information of a cell to be dropped; according to the fallback indication and the information of the cell to be fallback, the cell to be fallback is fallback-ended, including: and when the fallback indication is determined to be direct fallback, the cell is fallback to the cell to be fallback according to the frequency point information of the cell to be fallback.
In some implementations, obtaining the fallback indication includes: and under the condition that the current terminal is determined to be in the updating trying state and the paging request sent by the calling terminal is received, analyzing the message of the paging request and obtaining a fallback indication.
In some implementations, according to the fallback indication and the information of the cell to be fallback, after the fallback to the cell to be fallback, the method further includes: and sending a paging response to the calling terminal, and establishing communication connection with the calling terminal.
In some implementations, according to the fallback indication and the information of the cell to be fallback, after the fallback to the cell to be fallback, the method further includes: acquiring a first location area identifier of a current terminal during joint attachment and a second location area identifier of the current terminal in a cell to be fallen back; and comparing the first location area identifier with the second location area identifier, and sending a location updating request to the network side equipment under the condition that the first location area identifier is different from the second location area identifier so that the network side equipment updates the location information of the current terminal.
In some specific implementations, before obtaining fallback cell configuration information configured by a network side device under a condition that it is determined that the joint attach is completed, the method further includes: sending a joint attachment request to a mobile management entity so that the mobile management entity interacts with a visitor location register and attaches a current terminal to the mobile management entity, wherein the joint attachment request comprises: the attachment identifier is used for representing that the current terminal has a circuit domain fallback function; and responding to the joint attachment response fed back by the mobile management entity, and determining that the current terminal completes joint attachment.
In order to achieve the above object, a second aspect of the present application provides a cell fallback method, including: under the condition that the joint attachment is determined to be completed, sending the configuration information of the fallback cell to the terminal so that the terminal determines the corresponding information of the cell to be fallback according to the configuration information of the fallback cell; and under the condition that the terminal needs to perform cell fallback, sending a fallback indication to the terminal so that the terminal can fallback to the cell to be fallback according to the fallback indication and the cell information to be fallback, wherein the fallback indication is used for indicating the cell information to be fallback.
In order to achieve the above object, a third aspect of the present application provides a terminal comprising: a first obtaining module, configured to obtain fallback cell configuration information configured by a network side device, when it is determined that joint attachment is completed; the determining module is configured to determine the information of the cell to be fallen back corresponding to the current terminal according to the configuration information of the cell to be fallen back; a second obtaining module, configured to obtain a fallback indication, where the fallback indication is used to indicate cell information of a current terminal fallback; and the fallback module is configured to fallback to the cell to be fallback according to the fallback indication and the cell to be fallback information.
In order to achieve the above object, a fourth aspect of the present application provides a network-side device, including: the first configuration module is configured to send fallback cell configuration information to the terminal under the condition that the joint attachment is determined to be completed, so that the terminal determines corresponding information of the cell to be fallback according to the fallback cell configuration information; and the second configuration module is configured to send a fallback indication to the terminal under the condition that the terminal needs to perform cell fallback, so that the terminal falls back to the cell to be fallback according to the fallback indication and the cell information to be fallback, and the fallback indication is used for indicating the cell information to be fallback.
According to the cell fallback method, the terminal and the network side equipment, under the condition that joint attachment is determined to be completed, fallback cell configuration information configured by the network side equipment is obtained, so that the range of fallback cells needing to be screened by the terminal is narrowed, and cell fallback preparation is made in advance; according to the configuration information of the fallback cells, the information of the to-be-fallback cells corresponding to the current terminal is determined, the cells which are possible to fallback of the current terminal are screened on the basis of the pre-configured configuration information of the fallback cells, the measurement of the fallback cells is not needed when a paging request is received, the information processing amount of the terminal is reduced, and the screening efficiency of the terminal on the information of the fallback cells is improved; acquiring a fallback indication, wherein the fallback indication is used for indicating cell information of the current terminal fallback; the falling indication can directly fall back to the cell to be fallen back, the time length of the terminal falling back to the cell to be fallen back is shortened, and the working efficiency of the terminal is effectively improved.
Drawings
The accompanying drawings are included to provide a further understanding of the embodiments of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the principles of the disclosure and not to limit the disclosure. The above and other features and advantages will become more apparent to those skilled in the art by describing in detail exemplary embodiments with reference to the attached drawings.
Fig. 1 shows a flowchart of a cell fallback method according to an embodiment of the present application.
Fig. 2 is a flowchart illustrating a cell fallback method according to another embodiment of the present disclosure.
Fig. 3 is a flowchart illustrating a cell fallback method according to yet another embodiment of the present application.
Fig. 4 shows a block diagram of a terminal according to an embodiment of the present application.
Fig. 5 shows a block diagram of a network device according to an embodiment of the present application.
Fig. 6 shows a block diagram of a cell fallback system according to an embodiment of the present application.
Fig. 7 is a flowchart illustrating a working method of a cell fallback system according to an embodiment of the present application.
In the drawings:
400: the terminal 401: first acquisition module
402: the determination module 403: second acquisition module
404: the fallback module 500: network side equipment
501: the first configuration module 502: second configuration module
601: the called terminal 602: base station
603: the mobility management entity 604: accessing location registers
605: mobile switching center 606: calling terminal
Detailed Description
The following detailed description of embodiments of the present application will be made with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present application, are given by way of illustration and explanation only, and are not intended to limit the present application. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.
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.
When the mobile terminal determines that the TAU is completed, the mobile terminal may send an extended service request to a Mobility Management Entity (MME) to obtain fallback cell information configured by the base station. At this time, the mobile terminal needs TO measure all the configured information of the plurality of fallback cells and send the measurement result TO the base station, so that the base station determines a suitable fallback cell and then feeds back the information of the fallback cell TO the mobile terminal, and the mobile terminal in an UPDATE-trying (ATTEMPTING-TO-UPDATE) state needs TO measure all the cells TO obtain a target fallback cell by screening from the multiple measurement results, which results in an excessively long fallback time, and cannot perform normal communication with other terminals, thereby reducing user experience.
Based on the above problem, a first aspect of the present application provides a cell fallback method.
Fig. 1 shows a flowchart of a cell fallback method according to an embodiment of the present application. The method can be applied to a terminal, and as shown in fig. 1, the cell dropping method can include the following steps.
Step S101, obtaining configuration information of the fallback cell configured by the network side equipment under the condition that the joint attachment is determined to be completed.
The configuration information of the fallback cell comprises information of the fallback cell which is possibly used by the current terminal.
For example, the network side device may generate fallback cell configuration information according to the location information of the current terminal and the information of a preset number (e.g., 2 or 3) of fallback cells matched with the location information, and send the fallback cell configuration information to the current terminal, so as to reduce the number of cells that the current terminal needs to process when searching for a cell.
It should be noted that, when the current terminal performs cell measurement or cell search, it needs to perform measurement and processing on information of each searched cell to screen and obtain a cell with the best signal quality. If the number of cells corresponding to the current terminal is too large (for example, the number of corresponding cells is 5 or 8), the information processing amount of the terminal is increased, and the processing efficiency of the current terminal is reduced. And the configuration information of the fallback cell configured by the network side equipment can reduce the processing quantity of the current terminal to the cell information to the maximum extent and improve the processing efficiency of the current terminal.
And step S102, determining the information of the cell to be fallen back corresponding to the current terminal according to the configuration information of the cell to be fallen back.
The fallback cell configuration information may include any one or more of an identifier of a plurality of preset fallback cells, signal quality corresponding to the preset fallback cells, received power corresponding to the preset fallback cells, and transmit power corresponding to the preset fallback cells.
And processing each preset fallback cell by combining the multi-dimensional information to obtain the information of the cell to be fallback corresponding to the current terminal. For example, a plurality of preset fallback cells with the best signal quality are screened, then, the transmission power corresponding to the preset fallback cells is screened from the several preset fallback cells with the best signal quality, the preset fallback cell with the lowest transmission power and the best signal quality is obtained as the cell to be fallback, and information of the cell to be fallback corresponding to the cell to be fallback is obtained. The method and the device can also save the consumption of the receiving power of the terminal, prolong the standby time of the terminal and improve the use experience of a user while ensuring the optimal signal quality.
Step S103, obtaining a fallback indication.
The fallback indication is used for indicating the cell information of the fallback of the current terminal.
For example, the fallback indication may include: and directly dropping the mark. The direct drop identifier is used for indicating the current terminal to directly drop to the cell to be dropped, so that the drop speed of the terminal is accelerated.
And step S104, falling back to the cell to be fallen back according to the falling back indication and the cell to be fallen back information.
The fallback indication and the information of the cell to be fallback are used in combination, and the fallback indication may further include information of the cell to be fallback (for example, an identifier of the cell to be fallback, and the like), so that the terminal accelerates the speed of cell fallback.
In this embodiment, under the condition that it is determined that the joint attachment is completed, the configuration information of the fallback cells configured by the network side device is obtained, so as to narrow the range of the fallback cells that the terminal needs to screen, and prepare for cell fallback in advance; according to the configuration information of the fallback cells, the information of the to-be-fallback cells corresponding to the current terminal is determined, the cells which are possible to fallback of the current terminal are screened on the basis of the pre-configured configuration information of the fallback cells, the measurement of the fallback cells is not needed when a paging request is received, the information processing amount of the terminal is reduced, and the screening efficiency of the terminal on the information of the fallback cells is improved; acquiring a fallback indication, wherein the fallback indication is used for indicating cell information of the current terminal fallback; the falling indication can directly fall back to the cell to be fallen back, the time length of the terminal falling back to the cell to be fallen back is shortened, and the working efficiency of the terminal is effectively improved.
Fig. 2 is a flowchart illustrating a cell fallback method according to another embodiment of the present disclosure. The method can be applied to a terminal, and as shown in fig. 2, the cell dropping method can include the following steps.
Step S201, acquiring fallback cell configuration information configured by the network side device when determining that the joint attachment is completed.
Wherein, the joint attachment is used for attaching the current terminal to the network side device. The fallback cell configuration information comprises a plurality of configured cell information.
For example, if the current terminal supports multiple different network types and the current terminal can simultaneously receive communication signals corresponding to the multiple different network types, the current terminal can be simultaneously attached to network side devices corresponding to the multiple different network types, so as to facilitate the current terminal to perform multiple different service processes.
For example, The current terminal may simultaneously support The 4th Generation Mobile Communication Technology (4G) and The second Generation Mobile Communication Technology (2 nd Generation Mobile Communication Technology, 2G), and The current terminal may register on The network-side device corresponding to The 4G network and also register on The network-side device corresponding to The 2G network, so that The current terminal may simultaneously enjoy Communication services provided by a plurality of different network types, thereby improving user experience.
In some specific implementations, before obtaining fallback cell configuration information configured by a network side device under a condition that it is determined that the joint attach is completed, the method further includes: sending a joint attachment request to a mobile management entity so that the mobile management entity interacts with a visitor location register and attaches a current terminal to the mobile management entity, wherein the joint attachment request comprises: the attachment identifier is used for representing that the current terminal has a circuit domain fallback function; and responding to the joint attachment response fed back by the mobile management entity, and determining that the current terminal completes joint attachment.
The Circuit Switched Fallback (CSFB) technology is suitable for a scene in which a Circuit domain and a wireless network overlap, the network structure is simple, an IP Multimedia System (IMS) does not need to be deployed, existing network resources can be effectively utilized, and utilization efficiency of the network resources is improved.
Through carrying out message interaction with the mobile management entity, realize that current terminal can jointly adhere to, guarantee that current terminal can enjoy the different grade type communication service that circuit switched domain network and wireless network provided simultaneously, promote the use of terminal and experience.
Step S202, measuring the cells in the plurality of configured cell information to obtain a plurality of first cell information to be selected.
The first information of the cell to be selected comprises the signal quality of the first cell to be selected, and the quantity of the first information of the cell to be selected is less than or equal to the quantity of the configured cell information.
For example, the fallback cell configuration information includes N pieces of configured cell information, and for the N pieces of configured cell information, the signal quality of the N configured cells is measured to obtain M pieces of first information about the cell to be selected. Wherein N and M are integers greater than or equal to 1, and M is less than or equal to N.
And measuring each cell based on the N pieces of configured cell information, so that the number of cells to be measured by the current terminal can be reduced, the information processing amount of the current terminal is reduced, and the processing efficiency of the current terminal is improved.
Step S203, according to the signal quality of the first cell to be selected, sorting the information of the plurality of first cells to be selected to obtain a sorting result.
Wherein the ordering may include: sorting in ascending order or in descending order, the sorting may further include: any one or more of radix ordering, bubble ordering, direct insert ordering, binary insert ordering, and merge ordering. The signal quality may include: any one or more of a Received Signal Strength Indicator (RSSI), a Signal-to-Interference plus Noise Ratio (SINR), and a Reference Signal Received Power (RSRP).
For example, the information of the plurality of first candidate cells is sorted in an ascending order based on the signal quality (e.g., RSSI) of the first candidate cells, and an ascending order result is obtained, where the ascending order result includes: an identification of a first plurality of cells to be selected having an RSSI greater than a preset signal strength threshold (e.g., -106dBm, etc.). It should be noted that, the above is only an example, and other unexplained manners of sequencing information of a plurality of first candidate cells are also within the protection scope of the present application, and are not described herein again.
And sequencing the information of the plurality of first cells to be selected by a plurality of sequencing methods in different modes to obtain the plurality of first cells to be selected with the best signal quality, so that the subsequent processing is facilitated.
And step S204, determining the information of the cell to be fallen back corresponding to the current terminal according to the sorting result.
Specifically, the cell with the best signal quality in the ranking result may be used as the cell to be dropped corresponding to the current terminal, and the information of the cell to be dropped is obtained.
For example, the cell with the best RSSI value in the ranking result is used as the cell to be dropped corresponding to the current terminal; or, the cell with the best SINR value in the sequencing result is taken as the cell to be dropped corresponding to the current terminal; or, the cell with the best RSRP value in the ranking result is used as the cell to be fallen back corresponding to the current terminal.
In some specific implementations, before determining, according to the sorting result, information of a cell to be dropped corresponding to the current terminal, the method further includes: acquiring real-time position information of a current terminal; measuring a cell corresponding to the current terminal according to the real-time position information to obtain a plurality of pieces of second cell information to be selected, wherein the second cell information to be selected comprises the signal quality of the second cell to be selected; and screening the information of the plurality of second cells to be selected according to the signal quality of the second cells to be selected to obtain a screening result.
The current location of the terminal is dynamically changed in real time, and the real-time location information of the current terminal is location information corresponding to the terminal at the current time (for example, location information determined by a Global Positioning System (GPS), or identification information of a certain landmark building).
In order to obtain more accurate cell information corresponding to the real-time position information of the current terminal, the cell information can be configured by combining a plurality of configuration cell information configured by network side equipment and a plurality of second candidate cells obtained by the terminal through autonomous measurement, the cells needing to be subjected to cell dropping are further screened, a screening result is determined, so that the second candidate cells with better signal quality are obtained, the accuracy of the candidate cells is improved, and preparation is made for the subsequent terminal to perform cell dropping.
In some specific implementations, determining information of a cell to be dropped corresponding to a current terminal according to a sorting result includes: comparing the screening result with the sorting result to determine information of a plurality of third cells to be selected; and determining the information of the cell to be fallen back according to the information of the plurality of third cells to be selected.
The information of the third cell to be selected comprises the signal quality of the third cell to be selected, and the signal quality of the third cell to be selected is greater than a preset signal quality threshold; the information of the cell to be fallen back comprises the signal quality of the cell to be fallen back, and the signal quality of the cell to be fallen back is superior to the signal quality of other cells to be selected.
It should be noted that the third candidate cell information is information of the candidate cells of the quota obtained by performing comprehensive evaluation on the plurality of first candidate cells and the plurality of second candidate cells. The method and the device can ensure that the obtained information of the third cells to be selected is more suitable for the current terminal to carry out cell fallback, and then the information of the third cells to be selected is screened again to determine the information of the cells to be dropped with higher accuracy, and the accuracy of judging the fallback cells is improved.
In step S205, a fallback instruction is acquired.
Wherein the fallback indication is used for cell fallback at least for the current terminal. The fallback indication comprises: fall back directly or not.
In some implementations, obtaining the fallback indication includes: and under the condition that the current terminal is determined to be in the updating trying state and the paging request sent by the calling terminal is received, analyzing the message of the paging request and obtaining a fallback indication.
The attempt update state represents a state in which the current terminal cannot obtain a response of the network side device (for example, a mobility management entity) and cannot perform location update of the terminal.
The network side equipment adds a fallback indication in the paging request to respond to the position update of the current terminal, so that the current terminal can smoothly perform cell fallback, the fault that the current terminal cannot acquire communication service is avoided, and the service quality of the terminal is improved.
Step S206, the cell is fallen back to the cell to be fallen back according to the falling back indication and the information of the cell to be fallen back.
Wherein, the information of the cell to be fallen back comprises: and frequency point information of the cell to be dropped.
In some implementations, dropping to the cell to be dropped according to the drop-back indication and the cell to be dropped information includes: and when the fallback indication is determined to be direct fallback, the cell is fallback to the cell to be fallback according to the frequency point information of the cell to be fallback.
The current terminal directly falls to the cell to be fallen back under the fall back indication of the direct fall back configured by the network side equipment, and the frequency point information of the cell to be fallen back is used for communicating with the network side equipment, so that the smooth communication of the current terminal can be ensured, and the service quality is improved.
In this embodiment, the cell in the configured cell information is measured to obtain information of a plurality of first cells to be selected, and the information of the cells to be dropped is obtained by comprehensive screening in combination with information of a plurality of second cells to be selected, so that the accuracy of the cells to be dropped, which need to be dropped by the current terminal, is improved, the current terminal can smoothly drop to the cells to be dropped according to the drop indication of direct drop configured by the network-side device, and the frequency point information of the cells to be dropped is used for communicating with the network-side device, so that smooth communication of the current terminal can be ensured, and the communication service quality of the terminal is improved.
The embodiment of the present application provides another possible implementation manner, where after dropping to the cell to be dropped according to the drop-back instruction and the information of the cell to be dropped in step S206, the method further includes: acquiring a first location area identifier of a current terminal during joint attachment and a second location area identifier of the current terminal in a cell to be fallen back; and comparing the first location area identifier with the second location area identifier, and sending a location updating request to the network side equipment under the condition that the first location area identifier is different from the second location area identifier so that the network side equipment updates the location information of the current terminal.
Wherein, first position district sign or second position district sign, can both include: any one or more of the mobile country number, the mobile network number and the location area number, but the first location area identifier and the second location area identifier need to keep the same number of digits so as to be convenient for comparison.
For example, if the first location area identity is a combined number of a mobile country number, a mobile network number and a location area number, the second location area identity is also a combined number of a mobile country number, a mobile network number and a location area number.
If the first location area identifier and the second location area identifier are determined to be different, it is represented that the current terminal has moved, the real-time location information of the current terminal is different from the location information of the current terminal when the current terminal is jointly attached, and the network side equipment is required to update the location information of the current terminal, so that a better communication service is conveniently provided for the current terminal.
The embodiment of the present application provides another possible implementation manner, where after dropping to the cell to be dropped according to the drop-back instruction and the information of the cell to be dropped in step S104, the method further includes: and sending a paging response to the calling terminal, and establishing communication connection with the calling terminal.
The calling terminal is a terminal that sends a paging request, and the calling terminal expects to establish a communication connection with a current terminal and perform a corresponding communication service (e.g., a voice service or a data service).
After the communication connection between the current terminal and the calling terminal is determined, the position updating request of the current terminal can obtain the response of the network side equipment, the communication smoothness between the current terminal and the calling terminal can be ensured, and the use experience of the terminal is improved.
Fig. 3 is a flowchart illustrating a cell fallback method according to yet another embodiment of the present application. The method can be applied to a network side device (e.g., a base station, an MME, etc.), and as shown in fig. 3, the cell dropping method can include the following steps.
Step S301, sending fallback cell configuration information to the terminal when determining that the joint attachment is completed.
Wherein, the configuration information of the fallback cell comprises a plurality of configuration cell information, and the configuration cell information comprises: and configuring the identification of the cell and/or configuring the frequency point information of the cell.
When the terminal obtains the configuration information of the fallback cells, the terminal can screen the cells which are possible to fall back from the current terminal according to the configuration information of the fallback cells to determine the information of the cells to be fallen back corresponding to the terminal, and the terminal does not need to measure the fallback cells when receiving a paging request, so that the information processing amount of the terminal is reduced, and the screening efficiency of the terminal on the information of the fallback cells is improved.
Step S302, under the condition that the terminal needs to perform cell fall back, a fall back instruction is sent to the terminal.
The fallback indication is used for indicating the cell information of the terminal fallback. The fallback indication comprises: fall back directly or not.
For example, the terminal may drop back to the to-be-dropped cell corresponding to the to-be-dropped cell information according to the direct drop-back in the drop-back indication, so as to accelerate the cell drop-back speed of the terminal.
In this embodiment, when it is determined that the joint attachment is completed, the fallback cell configuration information is sent to the terminal, so that the range of the terminal for performing cell measurement can be reduced, the information processing amount of the terminal is reduced, and the screening efficiency of the terminal on the fallback cell information is improved; and under the condition that the terminal needs to perform cell fallback, sending a fallback indication to the terminal so that the terminal can directly fall back to the cell to be fallback, and communicating by using the frequency point information corresponding to the cell to be fallback, thereby improving the service quality of the terminal.
A second aspect of the present application provides a terminal. Fig. 4 shows a block diagram of a terminal according to an embodiment of the present application.
As shown in fig. 4, the terminal 400 includes: a first obtaining module 401, configured to obtain fallback cell configuration information configured by a network side device when it is determined that joint attachment is completed; a determining module 402, configured to determine, according to the fallback cell configuration information, information of a cell to be fallback corresponding to the current terminal; a second obtaining module 403, configured to obtain a fallback indication, where the fallback indication is used to indicate cell information of a current terminal fallback; a fallback module 404 configured to fallback to the cell to fallback according to the fallback indication and the cell to fallback information.
In some implementations, the fallback cell configuration information includes a plurality of configured cell information; the determining module 402 is specifically configured to: measuring cells in the information of the configured cells to obtain information of a plurality of first cells to be selected, wherein the information of the first cells to be selected comprises the signal quality of the first cells to be selected, and the quantity of the information of the first cells to be selected is less than or equal to that of the information of the configured cells; sequencing the information of the plurality of first cells to be selected according to the signal quality of the first cells to be selected to obtain a sequencing result; and determining the information of the cell to be fallen back corresponding to the current terminal according to the sequencing result.
In some implementations, the terminal 400 further includes: the processing module is configured to acquire real-time position information of a current terminal; measuring a cell corresponding to the current terminal according to the real-time position information to obtain a plurality of pieces of second cell information to be selected, wherein the second cell information to be selected comprises the signal quality of the second cell to be selected; and screening the information of the plurality of second cells to be selected according to the signal quality of the second cells to be selected to obtain a screening result.
In some specific implementations, determining information of a cell to be dropped corresponding to a current terminal according to a sorting result includes: comparing the screening result with the sorting result, and determining information of a plurality of third cells to be selected, wherein the information of the third cells to be selected comprises the signal quality of the third cells to be selected, and the signal quality of the third cells to be selected is greater than a preset signal quality threshold; and determining the information of the cell to be fallen back according to the information of the third cells to be selected, wherein the information of the cell to be fallen back comprises the signal quality of the cell to be fallen back, and the signal quality of the cell to be fallen back is superior to the signal quality of other cells to be selected.
In some implementations, the information of the cell to be dropped includes: frequency point information of a cell to be dropped; the fallback module 404 is specifically configured to, when it is determined that the fallback indication is a direct fallback, fallback to the cell to be fallback according to the frequency point information of the cell to be fallback.
In some specific implementations, the second obtaining module 403 is specifically configured to, in a case that it is determined that the current terminal is in an update attempt state and receives a paging request sent by the calling terminal, perform message parsing on the paging request to obtain a fallback indication.
In some implementations, according to the fallback indication and the information of the cell to be fallback, after the fallback to the cell to be fallback, the method further includes: and sending a paging response to the calling terminal, and establishing communication connection with the calling terminal.
In some implementations, the terminal 400 further includes: the comparison module is configured to acquire a first location area identifier of the current terminal during joint attachment and a second location area identifier of the current terminal in the cell to be fallen back; and comparing the first location area identifier with the second location area identifier, and sending a location updating request to the network side equipment under the condition that the first location area identifier is different from the second location area identifier so that the network side equipment updates the location information of the current terminal.
In some implementations, the terminal 400 further includes: a joint attachment module configured to send a joint attachment request to the mobility management entity, so that the mobility management entity interacts with the visitor location register to attach the current terminal to the mobility management entity, wherein the joint attachment request includes: the attachment identifier is used for representing that the current terminal has a circuit domain fallback function; and responding to the joint attachment response fed back by the mobile management entity, and determining that the current terminal completes joint attachment.
In the embodiment, under the condition that the joint attachment is determined to be completed, the first acquisition module is used for acquiring the configuration information of the fallback cells configured by the network side equipment so as to narrow the range of the fallback cells needing to be screened by the terminal and make preparation for cell fallback in advance; the method comprises the steps that a determining module is used for determining information of a cell to be fallen back corresponding to a current terminal according to the configuration information of the cell to be fallen back, and the cell which is possible to fall back of the current terminal is screened on the basis of the pre-configured configuration information of the cell to be fallen back, so that the measurement of the cell to be fallen back is not required when a paging request is received, the information processing amount of the terminal is reduced, and the screening efficiency of the terminal on the information of the cell to be fallen back is improved; acquiring a fallback indication by using a second acquisition module, wherein the fallback indication is used for indicating cell information of the current terminal fallback; the fall-back module is used for directly falling back to the cell to be fallen back through the fall-back indication, the time length of the terminal falling back to the cell to be fallen back is shortened, and the working efficiency of the terminal is effectively improved.
A third aspect of the present application provides a network side device. Fig. 5 shows a block diagram of a network device according to an embodiment of the present application.
As shown in fig. 5, the network side device 500 includes: a first configuration module 501, configured to send fallback cell configuration information to a terminal when determining that the joint attachment is completed, so that the terminal determines, according to the fallback cell configuration information, information of a cell to be fallback corresponding to the terminal; the second configuration module 502 is configured to, under the condition that it is determined that the terminal needs to perform cell fallback, send a fallback indication to the terminal, so that the terminal falls back to the cell to be fallback according to the fallback indication and the cell information to be fallback, where the fallback indication is used to indicate the cell information to be dropped by the terminal.
In the embodiment, under the condition that the joint attachment is determined to be completed, the first configuration module is used for sending the configuration information of the fallback cell to the terminal, so that the range of the terminal for cell measurement can be narrowed, the information processing amount of the terminal is reduced, and the screening efficiency of the terminal on the information of the fallback cell is improved; and under the condition that the terminal needs to perform cell fallback, sending a fallback instruction to the terminal by using the second configuration module so that the terminal can directly fall back to the cell to be fallback, and communicating by using the frequency point information corresponding to the cell to be fallback, thereby improving the service quality of the terminal.
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 application, a unit that is not so closely related to solving the technical problem proposed by the present application is not introduced in the present embodiment, but it does not indicate that no other unit exists in the present embodiment.
A fourth aspect of the present application provides a cell fallback system. Fig. 6 shows a block diagram of a cell fallback system according to an embodiment of the present application.
As shown in fig. 6, the cell dropping system includes the following devices: called terminal 601, base station 602, mobility management entity 603, visitor location register 604, mobile switching center 605 and calling terminal 606.
The called terminal 601 is installed with a 4G multimode card, and the 4G multimode card can implement a voice call service with the calling terminal 602 in a Circuit Switched Fallback (CSFB) manner.
Fig. 7 is a flowchart illustrating a working method of a cell fallback system according to an embodiment of the present application. As shown in fig. 7, the method for operating the cell dropping system includes the following steps.
In step S701, after the called terminal 601 is powered on, it sends a joint Attach Request (Attach Request) to the mobility management entity 603.
Wherein the joint attach request may be forwarded to the mobility management entity 603 via an access network device (e.g., base station 602, etc.). The joint attach request includes: and attaching the identifier. The attach flag is used to characterize that the called terminal 601 has a circuit domain fallback function, and the attach requested by the called terminal 601 is based on an Evolved Packet System (EPS) and an International Mobile Subscriber Identity (IMSI). The IMSI is an identifier used to distinguish different users in a cellular network, and the IMSI is a non-repeating identifier in all cellular networks.
In step S702, the mobility management entity 603 sends a local UPDATE REQUEST (LOCATION-UPDATE-REQUEST) to the Visitor LOCATION Register (VLR) 604.
Wherein the local update request comprises: any one or more of a Location Area Identity (LAI) where the called terminal 601 is currently located, an IMSI of the 4G multi-mode card, an identifier of the mobile management entity 603, and a local update type.
In step S703, after receiving the local update request, the visitor location register 604 stores the information in the local database, and creates an attach completion identifier associated with the called terminal 601 to determine that the called terminal 601 completes the joint attach.
The attach complete flag is used to mark that the called terminal 601 has completed the combined attach, and meanwhile, the visitor location register 604 also stores the network address corresponding to the mobility management entity 603, so as to facilitate subsequent paging of the called terminal 601.
In step S704, the visitor location register 604 feeds back the association attachment response to the mobility management entity 603, so that the mobility management entity 603 forwards the association attachment response to the called terminal 601.
Wherein the joint attachment response comprises: an attach complete identifier, a Temporary Mobile Station Identifier (TMSI) corresponding to the called terminal 601, and an LAI. The joint attach response may be forwarded by the mobility management entity 603 to an access network device (e.g., the base station 602, etc.), and then forwarded by the access network device to the called terminal 601.
It should be noted that, after the mobility management entity 603 obtains the joint attach response, the mobility management entity 603 stores the TMSI and LAI corresponding to the called terminal 601, so as to facilitate communication connection with the called terminal 601.
In step S705, after receiving the joint attach response, the called terminal 601 obtains an attach completion identifier therein, where the attach completion identifier is used to indicate that the called terminal 601 has completed joint attach.
It should be noted that, since the called terminal 601 has the CSFB function, the called terminal 601 can handle the circuit domain service when it is determined that the called terminal 601 completes the association attachment.
In step S706, the called terminal 601 sends a configuration request to the base station 602.
In step S707, the base station 602 feeds back a configuration response to the called terminal 601.
Wherein the configuration response comprises: fallback cell configuration information, the fallback cell configuration information including a plurality of configuration cell information.
In step S708, when it is determined that the called terminal 601 is in the idle state and location update is required, a TAU request is sent to the mobility management entity 603.
In step S709, when the called terminal 601 does not receive the TAU response fed back by the mobility management entity 603 within a preset time period (e.g., 5 seconds or 10 seconds), it is determined that the called terminal 601 enters ATTEMPTING-TO-UPDATE state, and at this time, the called terminal 601 starts a timer.
It should be noted that, while step S708 is executed, step S710 may also be executed synchronously.
In step S710, the called terminal 601 measures multiple configured cells in the fallback cell configuration information to obtain multiple pieces of first information of the cells to be selected, and stores the multiple pieces of first information of the cells to be selected in the local storage.
Wherein, a plurality of first cell information of waiting to select includes: the identities of a plurality of first candidate cells, and the signal quality of the first candidate cells is superior to the signal quality of other configured cells in the configuration information of the fallback cell; the number of the first information of the cell to be selected is less than or equal to the number of the information of the configured cell.
In step S711, the calling terminal 606 sends a call request to the mobile switching center 605, and desires to establish a communication connection with the called terminal 601.
It should be noted that the call request sent by the calling terminal 606 may be forwarded to the mobile switching center 605 through an access network device (not shown in the figure). The access network device and the mobile switching terminal 605 may use the same communication protocol for communication connection, where the network types of the access network device and the mobile switching terminal 605 are the same.
The Mobile Switching Center 605 may be a Mobile Switching Center (MSC) or other network devices, and the communication protocol used between the Mobile Switching Center 605 and the access network device matches the communication protocol used between the access network device and the calling terminal 606.
In step S712, the mobile switching center 605 forwards the call request to the mobility management entity 603.
Step S713, when it is determined that the mobility management entity 603 receives the call request sent by the calling terminal, the mobility management entity 603 can know that the called terminal 601 is currently in the ATTEMPTING-TO-UPDATE state through the history communication record of the called terminal 601, so that the call request is updated according TO the information of the target fallback cell and the fallback indication, and sends the updated call request TO the called terminal 601
The fallback indication is used to indicate that the called terminal 601 directly falls back to the target fallback cell, where the information of the target fallback cell includes an identifier of the target fallback cell and/or frequency point information of the target fallback cell.
It should be noted that the target fallback cell may be a cell obtained by screening from information of a plurality of first candidate cells, may also be a cell obtained by screening from information of a plurality of second candidate cells reported by the called terminal 601, and may also be a cell obtained by comprehensively screening and determining information of a plurality of first candidate cells and information of a plurality of second candidate cells. The second candidate cell information is cell information obtained by measuring a cell corresponding to the called terminal 601 based on the real-time location information of the called terminal 601. And the signal quality of the target fallback cell is the best quality cell in the plurality of candidate cells.
Step S714, after receiving the updated call request, the called terminal 601 performs message analysis on the updated call request to obtain information and a fallback indication of the target fallback cell; and directly falls back to the target fall-back cell according to the fall-back indication.
The called terminal 601 directly falls back to the target fall-back cell through the fall-back indication, so that the time length of the called terminal 601 falling back to the target fall-back cell is shortened.
In some specific implementations, when the called terminal 601 determines that the cell fallback is completed, if the called terminal 601 detects that the LAI of the target fallback cell is not consistent with the LAI corresponding to the cell during the joint attachment, the called terminal 601 sends a location update request to the mobility management entity 603, so that the mobility management entity 603 forwards the location update request to the visitor location register 604, and the visitor location register 604 updates the information, which is stored in the visitor location register 604 by the called terminal 601, and corresponds to the called terminal 601.
In step S715, the called terminal 601 feeds back the call response to the calling terminal 606, and establishes a communication connection with the calling terminal 606, so that the voice call service with the calling terminal 606 is completed.
In this embodiment, under the condition that it is determined that the called terminal enters the update-attempted state, the called terminal may perform fallback cell measurement according to the obtained fallback cell configuration information configured by the network-side device, so as to narrow the range of the called terminal performing cell measurement, reduce the information processing amount of the called terminal, and enable the called terminal to store several pieces of frequency point information with best measurement signals; when a calling terminal sends a calling request to a called terminal, a mobile management entity can add a fallback indication in the calling request to respond to the position update of the called terminal, so that the called terminal can fall back to a target fallback cell according to the fallback indication of direct fallback, and the cell fallback accuracy of the called terminal is improved; meanwhile, the calling terminal can establish communication connection with the called terminal so as to realize normal communication between the two terminals.
It is to be understood that the above embodiments are merely exemplary embodiments that are employed to illustrate the principles of the present application, and that the present application is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the application, and these changes and modifications are to be considered as the scope of the application.
Claims (12)
1. A cell fallback method, the method comprising:
acquiring fallback cell configuration information configured by network side equipment under the condition that joint attachment is determined to be completed;
determining the information of the cell to be fallen back corresponding to the current terminal according to the configuration information of the cell to be fallen back;
acquiring a fallback indication, wherein the fallback indication is used for indicating the cell information of the current terminal fallback;
and dropping to the cell to be dropped according to the dropping indication and the cell to be dropped information.
2. The method of claim 1, wherein the fallback cell configuration information comprises a plurality of configuration cell information;
determining the information of the cell to be dropped corresponding to the current terminal according to the configuration information of the cell to be dropped, including:
measuring cells in the configured cell information to obtain a plurality of pieces of first information of cells to be selected, wherein the first information of cells to be selected comprises the signal quality of the first cells to be selected, and the quantity of the first information of cells to be selected is less than or equal to that of the configured cell information;
sequencing the information of the plurality of first cells to be selected according to the signal quality of the first cells to be selected to obtain a sequencing result;
and determining the information of the cell to be fallen back corresponding to the current terminal according to the sequencing result.
3. The method according to claim 2, wherein before determining the information of the cell to be fallen back corresponding to the current terminal according to the sorting result, the method further comprises:
acquiring real-time position information of the current terminal;
measuring a cell corresponding to the current terminal according to the real-time position information to obtain a plurality of pieces of second cell information to be selected, wherein the second cell information to be selected comprises the signal quality of the second cell to be selected;
and screening the information of the plurality of second cells to be selected according to the signal quality of the second cells to be selected to obtain a screening result.
4. The method according to claim 3, wherein the determining information of the cell to be fallen back corresponding to the current terminal according to the sorting result comprises:
comparing the screening result with the sorting result, and determining information of a plurality of third cells to be selected, wherein the information of the third cells to be selected comprises the signal quality of the third cells to be selected, and the signal quality of the third cells to be selected is greater than a preset signal quality threshold;
and determining the information of the cell to be fallen back according to the information of the plurality of third cells to be selected, wherein the information of the cell to be fallen back comprises the signal quality of the cell to be fallen back, and the signal quality of the cell to be fallen back is superior to the signal quality of other cells to be selected.
5. The method of claim 1, wherein the information of the cell to be fallen back comprises: frequency point information of a cell to be dropped;
the dropping to the cell to be dropped according to the dropping indication and the cell to be dropped information comprises:
and under the condition that the fallback indication is determined to be direct fallback, the cell to be fallback is fallback to according to the frequency point information of the cell to be fallback.
6. The method of claim 1, wherein the obtaining the fallback indication comprises:
and under the condition that the current terminal is determined to be in the updating attempt state and the paging request sent by the calling terminal is received, analyzing the paging request to obtain the fallback indication.
7. The method of claim 6, wherein dropping back to the cell to be dropped according to the drop-back indication and the cell to be dropped information further comprises:
and sending a paging response to the calling terminal, and establishing communication connection with the calling terminal.
8. The method according to any one of claims 1 to 7, wherein said dropping back to the cell to be dropped according to the drop-back indication and the cell to be dropped information further comprises:
acquiring a first location area identifier of the current terminal during joint attachment and a second location area identifier of the current terminal in the cell to be fallen back;
and comparing the first location area identifier with the second location area identifier, and sending a location updating request to the network side equipment under the condition that the first location area identifier is different from the second location area identifier, so that the network side equipment updates the location information of the current terminal.
9. The method according to any one of claims 1 to 7, wherein before the obtaining the fallback cell configuration information configured by the network side device under the condition that it is determined that the joint attach is completed, the method further includes:
sending a joint attachment request to a mobility management entity so that the mobility management entity interacts with a visitor location register to attach the current terminal to the mobility management entity, wherein the joint attachment request includes: the attachment identifier is used for representing that the current terminal has a circuit domain fallback function;
and responding to a joint attachment response fed back by the mobile management entity, and determining that the current terminal completes the joint attachment.
10. A cell fallback method, the method comprising:
under the condition that the joint attachment is determined to be completed, sending fallback cell configuration information to a terminal, so that the terminal determines corresponding information of a cell to be fallback according to the fallback cell configuration information;
and under the condition that the terminal needs to perform cell fallback, sending a fallback indication to the terminal so that the terminal falls back to the cell to be fallen according to the fallback indication and the cell information to be fallen, wherein the fallback indication is used for indicating the cell information to be fallen back by the terminal.
11. A terminal, comprising:
a first obtaining module, configured to obtain fallback cell configuration information configured by a network side device, when it is determined that joint attachment is completed;
a determining module configured to determine information of a cell to be dropped corresponding to a current terminal according to the configuration information of the dropped cell;
a second obtaining module, configured to obtain a fallback indication, where the fallback indication is used to indicate cell information of fallback of the current terminal;
and the fallback module is configured to fallback to the cell to be fallback according to the fallback indication and the cell to be fallback information.
12. A network-side device, comprising:
a first configuration module, configured to send fallback cell configuration information to a terminal under a condition that it is determined that the joint attachment is completed, so that the terminal determines, according to the fallback cell configuration information, information of a cell to be fallback corresponding to the terminal;
and the second configuration module is configured to send a fallback indication to the terminal under the condition that it is determined that the terminal needs to perform cell fallback, so that the terminal falls back to the cell to be fallen according to the fallback indication and the cell information to be fallen, and the fallback indication is used for indicating the cell information to be fallen back by the terminal.
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