CN105323813B - A kind of method and user equipment returning to network - Google Patents
A kind of method and user equipment returning to network Download PDFInfo
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Abstract
The invention discloses a kind of methods for returning to network, it include: when needing to return to the second network, the user equipment (UE) of first network is resided according to the first network currently saved and the corresponding position relationship of second network, determines the frequency point of second network of itself present position；The UE searches for the cell of second network on the frequency point of determining second network；And the resident of second network is initiated in the cell of second network searched.The present invention also discloses a kind of UE.
Description
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a method for returning to a network and a User Equipment (UE).
Background
For operators operating multiple mode networks, there is a need to consider the issue of how to guarantee that a UE interoperates in multiple networks for coverage or other reasons.
At present, after a Long Term Evolution (LTE) terminal falls back to a 2G/3G network and needs to return to the LTE network, in order to save operation cost (OPEX), after the LTE network is introduced, an operator does not modify a network element of the 2G/3G network, and only relies on an algorithm of the terminal to perform frequency sweeping, thereby returning to the LTE network. The reason why the LTE terminal falls back to the 2G/3G network may be: circuit Switched Fallback (CSFB), Single Radio Voice Call Continuity (SRVCC), or loss of LTE network coverage, etc. Under the condition, as the network element of the 2G/3G network is not modified, a plurality of traditional interoperation functions from the 2G/3G network to the 4G network, such as inter-system switching and redirection, cannot be realized; the LTE terminal can only search for some or all of the supported LTE frequency points by itself, and the LTE frequency points supported by the LTE terminal can be historical frequency points stored by the LTE terminal or frequency points measured by using other methods, that is, information of the frequency points searched by the LTE terminal is historical frequency point information, so that the success rate of the LTE terminal returning to the LTE network is reduced, and meanwhile, the problem of large time delay exists.
Disclosure of Invention
In order to solve the existing technical problem, embodiments of the present invention provide a method for returning to a network and a UE.
The embodiment of the invention provides a method for returning to a network, which comprises the following steps:
when needing to return to a second network, the UE residing in a first network determines the frequency point of the second network at the current position of the UE according to the corresponding position relation between the first network and the second network which is stored currently;
the UE searches the cell of the second network on the determined frequency point of the second network; and initiating camping of the second network on the searched cell of the second network.
In the foregoing solution, before determining the frequency point of the second network at the current location of the mobile terminal, the method further includes:
and the UE acquires and stores the corresponding position relation.
In the foregoing solution, the determining, by the UE residing in the first network, the frequency point of the second network at the current location of the UE according to the currently stored corresponding location relationship between the first network and the second network includes:
the UE searches the position area code of the second network corresponding to the cell where the UE is currently located according to the corresponding relation between the currently stored position area code of the first network and the position area code of the second network;
and the UE determines the frequency point of the second network corresponding to the cell in which the UE is currently located according to the searched location area code of the second network and the corresponding relation between the currently stored location area code of the second network and the frequency point of the second network.
In the above scheme, the first network is a 2G/3G network; accordingly, the second network is an LTE network.
In the above solution, the corresponding position relationship includes: and the corresponding relation between the Location Area Code (LAC) of the 2G/3G network, the Tracking Area Code (TAC) of the LTE network and the LTE frequency point.
An embodiment of the present invention further provides a UE, including: the device comprises a determining unit, a searching unit and a resident initiating unit; wherein,
the determining unit is configured to determine, when the UE needs to return to the second network, a frequency point of the second network at a current location of the UE according to a currently stored corresponding location relationship between the first network and the second network; the UE camping on the first network;
the searching unit is configured to search for a cell of the second network on the determined frequency point of the second network;
the camping initiating unit is configured to initiate camping of the second network on the searched cell of the second network.
In the foregoing solution, the UE further includes: and the acquisition unit is used for acquiring and storing the corresponding position relation.
In the foregoing solution, the determining unit includes: a searching module and a determining module; wherein,
the searching module is used for searching the position area code of the second network corresponding to the cell where the searching module is currently located according to the corresponding relation between the currently stored position area code of the first network and the position area code of the second network;
the determining module is configured to determine, according to the searched location area code of the second network and a correspondence between the currently stored location area code of the second network and the frequency point of the second network, the frequency point of the second network corresponding to the cell in which the determining module is currently located.
In the above scheme, the first network is a 2G/3G network; accordingly, the second network is an LTE network.
In the foregoing solution, the UE further includes: and the storage unit is used for storing the corresponding position relation.
According to the method for returning to the network and the UE provided by the embodiment of the invention, when the UE needs to return to the second network, the UE residing in the first network determines the frequency point of the second network at the current position of the UE according to the corresponding position relation between the first network and the second network which is stored currently; the UE searches the cell of the second network on the determined frequency point of the second network; and initiating the residence of the second network on the searched cell of the second network, because the UE determines the frequency point of the second network based on the currently stored corresponding position relationship between the first network and the second network, and searches the cell of the second network on the determined frequency point of the second network, thus avoiding full-band frequency sweeping, namely: and other unnecessary frequency points do not need to be searched, so that the accuracy and the time delay of the UE returning to the second network are ensured.
Drawings
In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having different letter suffixes may represent different examples of similar components. The drawings illustrate generally, by way of example, but not by way of limitation, various embodiments discussed herein.
FIG. 1 is a flow chart of a method for returning to a network according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a method for returning to a network according to a second embodiment of the present invention;
FIG. 3 is a diagram illustrating a network location relationship according to a second embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a network location relationship in a building according to a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of a UE according to an embodiment of the present invention.
Detailed Description
At present, when an LTE terminal falling back to a 2G/3G network returns to the LTE network, only part or all of LTE frequency points supported by the LTE terminal can be searched by self, namely, the returning performance completely depends on the performance of the LTE terminal, a network side does not have any auxiliary measures, and the LTE frequency point information supported by the LTE terminal is historical frequency point information, so that the success rate of returning the LTE terminal to the LTE network is reduced; moreover, if the LTE terminal searches for all frequency points, there is a problem of a long delay.
Based on this, in various embodiments of the invention: when needing to return to a second network, the UE residing in a first network determines the frequency point of the second network at the current position of the UE according to the corresponding position relation between the first network and the second network which is stored currently; the UE searches the cell of the second network on the determined frequency point of the second network; and initiating the residence of the second network in the searched cell of the second network, wherein the corresponding position relationship is changed according to the network deployment, that is, the corresponding position relationship is continuously updated, so that the frequency point determined by the terminal is consistent with the current network deployment, and therefore, the error rate and the time delay of the UE returning to the second network can be greatly reduced by determining the frequency point of the second network based on the currently stored corresponding position relationship.
The present invention will be described in further detail with reference to examples.
Example one
The method for returning to the network in this embodiment, as shown in fig. 1, includes the following steps:
step 101: when needing to return to a second network, the UE residing in a first network determines the frequency point of the second network at the current position of the UE according to the corresponding position relation between the first network and the second network which is stored currently;
specifically, the UE searches for the location area code of the second network corresponding to the cell where the UE is currently located according to the correspondence between the location area code of the first network and the location area code of the second network, which is currently stored;
and the UE determines the frequency point of the second network corresponding to the cell in which the UE is currently located according to the searched location area code of the second network and the corresponding relation between the currently stored location area code of the second network and the frequency point of the second network.
In practical application, the first network may be a 2G/3G network, and correspondingly, the second network may be an LTE network, or a B4G network, a 5G network, or the like; of course, the first network may also be an LTE network or a B4G network, a 5G network, etc., and correspondingly, the second network may be a 2G/3G network; in other words, the present embodiment does not limit the first network and the second network; the first network and the second network may also be other networks as technology develops.
When the first network is a 2G/3G network and the second network is an LTE network, the location area code of the first network refers to: LAC, correspondingly, the location area code of the second network refers to TAC; in other words, the corresponding positional relationship includes: and the corresponding relation of the location area code LAC of the 2G/3G network, the tracking area code TAC of the LTE network and the LTE frequency point. When the first network and the second network are other networks, and so on.
In practical application, the correspondence between the location area code of the first network, the location area code of the second network, and the frequency point of the second network may be stored in a table form, as shown in table 1.
TABLE 1
Before performing this step, the method may further include:
and the UE acquires and stores the corresponding position relation.
Wherein, the corresponding position relationship can be notified to the UE by the network side through the system information of the first network or other signaling; or, a network administrator generation or network operation, administration and Maintenance (OAM) system automatically generates the corresponding location relationship, and the UE may obtain the corresponding location relationship by downloading; that is, the corresponding position relationship may be acquired in a preconfigured manner.
Here, when the corresponding location relationship is notified to the UE by the network side through system information or other signaling, the air interface specifications of the network side and the UE need to be defined, and for a specific implementation, details are not described again for those skilled in the art.
Step 102: the UE searches the cell of the second network on the determined frequency point of the second network; and initiating camping of the second network on the searched cell of the second network.
Here, when the cell of the second network is not searched on the determined frequency point of the second network, the UE searches for the cell of the second network over the full frequency band.
The method for returning to the network provided by the embodiment of the invention is particularly suitable for the application scene that the UE is not configured with the second network adjacent cell in the first network.
According to the method for returning to the network provided by the embodiment of the invention, when the second network needs to be returned, the UE residing in the first network determines the frequency point of the second network at the current position of the UE according to the corresponding position relation between the first network and the second network which is stored currently; the UE searches the cell of the second network on the determined frequency point of the second network; and initiating the residence of the second network on the searched cell of the second network, because the UE determines the frequency point of the second network based on the currently stored corresponding position relationship between the first network and the second network, and searches the cell of the second network on the determined frequency point of the second network, thus avoiding full-band frequency sweeping, namely: and other unnecessary frequency points do not need to be searched, so that the accuracy and the time delay of the UE returning to the second network are ensured.
In addition, the scheme has small change on the network side and the UE, the UE does not need to add hardware equipment, and the cost is low.
Example two
The application scenario of this embodiment is as follows: the UE is an LTE terminal, which falls back to the 2G/3G network and needs to return to the LTE network.
The method for returning to the network in this embodiment, as shown in fig. 2, includes the following steps:
step 201: the LTE terminal acquires and stores the corresponding relation between the LAC of the 2G/3G network, the TAC of the LTE network and the LTE frequency point;
here, the correspondence may be notified to the LTE terminal by the network side through system information or other signaling of the 2G/3G network; or, the network management personnel or the OAM system of the network automatically generates the corresponding relationship, and the LTE may obtain the corresponding position relationship in a downloading manner, that is: and acquiring the corresponding relation in a pre-configured mode.
The minimum coverage unit of the LTE network is a cell, and a plurality of cells form a tracking area (TrackingArea), and the tracking area has a common TAC and is covered by tracking areas corresponding to other TACs around the TAC. Generally, several tracking areas with continuous coverage will have one or several frequency bins as the basic coverage, as shown in fig. 3 and 4. For hot spots, different frequency coverage can be performed to supplement heat, as shown in fig. 3The area shown.
At present, a coverage area corresponding to an LAC of a Global System for Mobile communication (GSM) network may be greater than or equal to a coverage area corresponding to a TAC of an LTE network, and therefore, in a certain region, the LAC of the GSM network may be mapped to several LTE TACs that are covered at the same time, and further mapped to an LTE frequency point, that is: GSMLAC- > LTE TAC- > LTE frequency points, as shown in fig. 3, LAC 1 of the GSM network corresponds to LTE frequency points f0, f1, and as shown in fig. 4, LAC of the GSM network corresponds to LTE frequency points f2, f3, and f 4.
In practical application, for a scenario covered by the LTE inter-frequency hot spot, in order to simplify configuration, only an LTE frequency point for covering may be configured in the correspondence, that is, the GSM LACl in fig. 3 only corresponds to the LTE frequency point f 0.
The LTE terminal may be a Time Division Duplex-LTE (TDD-LTE, Time Division Duplex-LTE) LTE terminal or a Frequency Division Duplex-LTE (FDD-LTE, Frequency Division Duplex-LTE) terminal; alternatively, the terminal is not limited to a data terminal, a Circuit Switched Fallback (CSFB) terminal, a Voice over LTE (VoLTE) terminal, a dual standby terminal, and the like.
It should be noted that: the 2G/3G network of this embodiment is not limited to the GSM network and the UTRAN (Universal Mobile telecommunications System Radio access network).
Step 202: when the LTE network needs to be returned, the LTE terminal searches the TAC of the LTE network corresponding to the cell where the LTE terminal is located according to the correspondence between the LAC of the 2G/3G network and the TAC of the LTE network, wherein the correspondence is stored at present;
here, assuming that the LTE terminal falls back to the GSM network using the CSFB technique, the LTE terminal needs to return to the LTE network after hanging up a Circuit Switched (CS) phone.
Step 203: the LTE terminal determines an LTE frequency point corresponding to a cell in which the LTE terminal is currently located according to the searched TAC of the LTE network and the correspondence between the LAC of the LTE network and the LTE frequency point which is currently stored;
step 204: the LTE terminal searches a cell of the LTE network on the determined corresponding LTE frequency point;
step 205: the LTE terminal judges whether a cell of the LTE network is searched, if so, step 206 is executed, otherwise, step 207 is executed;
here, in practical application, the correspondence between LAC of the 2G/3G network, TAC of the LTE network, and LTE frequency point may be stored in the LTE terminal in a table manner shown in table 1; when a plurality of corresponding relations exist, the LTE terminal determines an LTE frequency point corresponding to a cell where the LTE terminal is located from a table according to the sequence from top to bottom, if the cell of the LTE network is not searched on the determined LTE frequency point, the LTE frequency point in the next corresponding relation in the table is used as the LTE frequency point corresponding to the cell where the LTE terminal is located, the cell of the LTE network is searched on the determined LTE frequency point, if the cell of the LTE network is not searched, the LTE frequency point in the next corresponding relation in the table is used as the LTE frequency point corresponding to the cell where the LTE terminal is located, the cell of the LTE network is searched on the determined LTE frequency point, and the like, until the cell of the LTE network is searched on the determined LTE frequency point; when the cells of the LTE network are not searched on the LTE frequency points in all the corresponding relations, the LTE terminal searches the cells of the LTE network on the full frequency band.
Step 206: initiating the residing of the second network on the searched cell of the second network, and ending the current processing process;
step 207: and the LTE terminal searches the cell of the LTE network in the full frequency band, initiates the residence of the second network in the searched cell and ends the current processing flow.
EXAMPLE III
To implement the method of the first embodiment, this embodiment provides a UE, as shown in fig. 5, where the UE includes: a determining unit 51, a searching unit 52 and a resident initiating unit 53; wherein,
the determining unit 51 is configured to determine, when needing to return to a second network, a frequency point of the second network at a current location of the UE according to a currently stored corresponding location relationship between a first network and the second network; the UE camping on the first network;
the searching unit 52 is configured to search for a cell of the second network on the determined frequency point of the second network;
the camping initiating unit 53 is configured to initiate camping of the second network on the searched cell of the second network.
Wherein, the determining unit 51 may further include: a searching module and a determining module; wherein,
the searching module is used for searching the position area code of the second network corresponding to the cell where the searching module is currently located according to the corresponding relation between the currently stored position area code of the first network and the position area code of the second network;
the determining module is configured to determine, according to the searched location area code of the second network and a correspondence between the currently stored location area code of the second network and the frequency point of the second network, the frequency point of the second network corresponding to the cell in which the determining module is currently located.
Here, in practical application, the first network may be a 2G/3G network, and correspondingly, the second network may be an LTE network, or a B4G network, a 5G network, or the like; of course, the first network may also be an LTE network or a B4G network, a 5G network, etc., and correspondingly, the second network may be a 2G/3G network; in other words, the present embodiment does not limit the first network and the second network; the first network and the second network may also be other networks as technology develops.
When the first network is a 2G/3G network and the second network is an LTE network, the location area code of the first network refers to: LAC, correspondingly, the location area code of the second network refers to TAC; in other words, the corresponding positional relationship includes: and the corresponding relation of the location area code LAC of the 2G/3G network, the tracking area code TAC of the LTE network and the LTE frequency point. When the first network and the second network are other networks, and so on.
In practical application, the correspondence between the location area code of the first network, the location area code of the second network, and the frequency point of the second network may be stored in a table form, as shown in table 1.
The UE may further include: and the acquisition unit is used for acquiring and storing the corresponding position relation.
The UE may further include: and the storage unit is used for storing the corresponding position relation.
Wherein, the corresponding position relationship can be notified to the acquiring unit by the network side through the system information or other signaling of the first network; or, the network administrator generates or the OAM system of the network automatically generates the corresponding position relationship, and the obtaining unit may obtain the corresponding position relationship in a downloading manner; that is, the corresponding position relationship may be acquired in a preconfigured manner.
Here, when the corresponding location relationship is notified to the obtaining unit by the network side through system information or other signaling, the air interface specifications of the network side and the UE need to be defined, and for a specific implementation, details are not described again for those skilled in the art.
When the cell of the second network is not searched on the determined frequency point of the second network, the searching unit 52 searches the cell of the second network on the full frequency band.
The scheme provided by the embodiment of the invention is particularly suitable for the application scene that the UE is not configured with the second network adjacent cell in the first network.
In practical application, the searching module and the determining module may be implemented by a Central Processing Unit (CPU), a Digital Signal Processor (DSP), or a Programmable logic Array (FPGA) in the UE; the search unit 52, the resident initiation unit 53, and the acquisition unit may be implemented by a CPU, a DSP, or an FPGA in the UE in combination with a transceiver; the storage unit may be implemented by a memory in the UE.
When the UE provided in the embodiment of the present invention needs to return to a second network, the determining unit 51 determines a frequency point of the second network at a current location of the UE according to a currently stored corresponding location relationship between the first network and the second network; the searching unit 52 searches the cell of the second network on the determined frequency point of the second network; the residence initiating unit 53 initiates residence of the second network on the searched cell of the second network, and because the frequency point of the second network is determined based on the currently stored corresponding position relationship between the first network and the second network, and the cell of the second network is searched on the determined frequency point of the second network, full-band frequency sweeping can be avoided, that is: and other unnecessary frequency points do not need to be searched, so that the accuracy and the time delay of the UE returning to the second network are ensured.
In addition, the scheme has small change on the network side and the UE, the UE does not need to add hardware equipment, and the cost is low.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (8)
1. A method for returning to a network, the method comprising:
user Equipment (UE) acquires and stores a corresponding position relation between a first network and a second network;
when needing to return to the second network, the UE residing in the first network determines the frequency point of the second network at the current position of the UE according to the corresponding position relation between the first network and the second network which is stored currently;
the UE searches the cell of the second network on the determined frequency point of the second network; and initiating camping of the second network on the searched cell of the second network.
2. The method of claim 1, wherein the determining, by the UE residing in the first network, the frequency point of the second network at the current location of the UE according to the currently stored corresponding location relationship between the first network and the second network comprises:
the UE searches the position area code of the second network corresponding to the cell where the UE is currently located according to the corresponding relation between the currently stored position area code of the first network and the position area code of the second network;
and the UE determines the frequency point of the second network corresponding to the cell in which the UE is currently located according to the searched location area code of the second network and the corresponding relation between the currently stored location area code of the second network and the frequency point of the second network.
3. The method of claim 1, wherein the first network is a 2G/3G network; accordingly, the second network is an LTE network.
4. The method according to claim 3, wherein the corresponding positional relationship comprises: and the corresponding relation of the location area code LAC of the 2G/3G network, the tracking area code TAC of the LTE network and the LTE frequency point.
5. A UE, wherein the UE comprises: the device comprises an acquisition unit, a determination unit, a search unit and a resident initiation unit; wherein,
the acquiring unit is used for acquiring and storing the corresponding position relation between the first network and the second network;
the determining unit is configured to determine, when the UE needs to return to the second network, a frequency point of the second network at a current location of the UE according to a currently stored corresponding location relationship between the first network and the second network; the UE camping on the first network;
the searching unit is configured to search for a cell of the second network on the determined frequency point of the second network;
the camping initiating unit is configured to initiate camping of the second network on the searched cell of the second network.
6. The UE of claim 5, wherein the determining unit comprises: a searching module and a determining module; wherein,
the searching module is used for searching the position area code of the second network corresponding to the cell where the searching module is currently located according to the corresponding relation between the currently stored position area code of the first network and the position area code of the second network;
the determining module is configured to determine, according to the searched location area code of the second network and a correspondence between the currently stored location area code of the second network and the frequency point of the second network, the frequency point of the second network corresponding to the cell in which the determining module is currently located.
7. The UE of claim 5, wherein the first network is a 2G/3G network; accordingly, the second network is an LTE network.
8. The UE of claim 5, wherein the UE further comprises: and the storage unit is used for storing the corresponding position relation.
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| WO2018065936A1 (en) * | 2016-10-07 | 2018-04-12 | Telefonaktiebolaget Lm Ericsson (Publ) | Support of single radio voice call continuity in next generation (5g) networks |
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