CN107682855B - Method and device for searching network through international roaming - Google Patents
Method and device for searching network through international roaming Download PDFInfo
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- H04W8/26—Network addressing or numbering for mobility support
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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Abstract
The invention provides a method and a device for searching a network by international roaming, which can be used for preferentially searching the network by adopting WCDMA (wideband code division multiple Access) if a mobile terminal is judged to be in an international roaming state when the mobile terminal is started; then when successfully registering to the WCDMA network, determining whether an available LTE network neighboring cell exists and recording frequency point information of the WCDMA network; if so, attempting to register the LTE network; if the LTE network fails to be registered, searching and registering the WCDMA network again through the stored frequency point information of the WCDMA network, so that the terminal can be ensured to quickly recover network connection, and the user experience is improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for searching a network through international roaming.
Background
Currently, when a mobile terminal roams internationally, after the mobile terminal roams to some countries, the mobile terminal usually searches for an LTE (Long Term Evolution) network, that is, a 4G network. If the operator of the country where the SIM card is located does not sign the LTE roaming agreement with the operator of the roaming country but only signs the 3G or 2G roaming agreement, even if the 3G or 2G Network of the roaming operator allows the roaming Mobile terminal to register, the Mobile terminal is likely to be denied access by the roaming Network PLMN (Public Land Mobile Network) of the operator of the roaming country because the LTE Network is not searched. Then, the local roaming network PLMN may be marked as FPLMN (Forbidden PLMN) by the mobile terminal, that is, the PLMN is regarded as a PLMN to which the mobile terminal is prohibited from accessing, so that the mobile terminal may not register with the PLMN of the roaming operator, and thus the mobile terminal may not have network access in the roaming country.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for searching a network by international roaming, so as to solve the problem that a mobile terminal cannot access a network when roaming to a country that does not support an LTE protocol in the prior art.
Specifically, the invention is realized by the following technical scheme:
the invention provides a method for searching a network by international roaming, which is applied to a mobile terminal and comprises the following steps:
when starting up, if judging that the mobile terminal is in the international roaming state, adopting WCDMA to preferentially search the network;
when successfully registering to the WCDMA network, determining whether an available LTE network neighboring cell exists and recording frequency point information of the WCDMA network;
if so, attempting to register the LTE network;
and if the LTE network is failed to be registered, searching and registering the WCDMA network again through the stored frequency point information of the WCDMA network.
As an embodiment, the preferentially performing network search by using wideband code division multiple access WCDMA specifically includes:
and acquiring a network searching sequence priority list of the user, and changing the priority of the WCDMA in the network searching sequence priority list into the highest priority.
As an embodiment, the specific method for determining whether there is an available LTE network neighboring cell includes:
acquiring network neighbor cell information of a roaming ground network, wherein the network neighbor cell information comprises network types and frequency point information corresponding to network neighbor cells;
finding an LTE network adjacent area through a network type;
judging whether the LTE network neighboring cell meets the residence condition or not according to the frequency point information of the LTE network neighboring cell; if yes, determining the LTE network neighboring cell as an available LTE network neighboring cell; if not, determining that the LTE network neighboring cell is the unavailable LTE network neighboring cell.
As an embodiment, the determining, by using the frequency point information of the LTE network neighboring cell, whether the LTE network neighboring cell meets the camping condition specifically includes:
detecting the signal intensity of the LTE network neighboring cell through the frequency point information of the LTE network neighboring cell;
calculating a residence value of the LTE network neighboring cell according to the signal intensity of the LTE network neighboring cell;
and when the residence value is larger than 0, determining that the LTE network neighboring cell meets the residence condition.
As an embodiment, when registering the LTE network fails, the method further includes:
and if the PLMN of the LTE network is determined to be in the FPLMN list of the terminal, removing the PLMN of the LTE network from the FPLMN list.
Based on the same conception, the invention also provides a device for searching the network by international roaming, which is applied to the mobile terminal and comprises the following components:
the selection unit is used for preferentially searching the network by adopting the WCDMA if the mobile terminal is judged to be in the international roaming state when the mobile terminal is started;
the determining unit is used for determining whether an available LTE network neighboring cell exists and recording frequency point information of the WCDMA network when the WCDMA network is successfully registered;
the first registration unit is used for trying to register the LTE network when the fact that the available LTE network neighboring cell exists is determined;
and the second registration unit is used for searching and registering the WCDMA network again through the stored frequency point information of the WCDMA network if the registration of the LTE network fails.
As an embodiment, the selecting unit is specifically configured to obtain a network searching order priority list of the selecting unit, and change the priority of the WCDMA in the network searching order priority list to be the highest priority.
As one embodiment, the first registration unit includes:
the network neighbor cell searching unit is used for obtaining network neighbor cell information of a roaming ground network, wherein the network neighbor cell information comprises network types and frequency point information corresponding to network neighbor cells; finding an LTE network adjacent area through a network type;
the judging subunit is used for judging whether the LTE network neighboring cell meets the residence condition or not according to the frequency point information of the LTE network neighboring cell; if yes, determining the LTE network neighboring cell as an available LTE network neighboring cell; if not, determining that the LTE network neighboring cell is the unavailable LTE network neighboring cell.
As an embodiment, the determining subunit is specifically configured to detect the signal strength of the LTE network neighboring cell through the frequency point information of the LTE network neighboring cell; calculating a residence value of the LTE network neighboring cell according to the signal intensity of the LTE network neighboring cell; and when the residence value is larger than 0, determining that the LTE network neighboring cell meets the residence condition.
As an embodiment, the apparatus further comprises:
and the information deleting unit is used for removing the PLMN of the LTE network from the FPLMN list if the PLMN of the LTE network is determined to be in the FPLMN list of the terminal when the registration of the LTE network fails.
Therefore, when the mobile terminal is started, if the mobile terminal is judged to be in the international roaming state, the WCDMA is adopted to preferentially search the network; then when successfully registering to the WCDMA network, determining whether an available LTE network neighboring cell exists and recording frequency point information of the WCDMA network; if so, attempting to register the LTE network; and if the LTE network fails to be registered, searching and registering the WCDMA network again through the stored frequency point information of the WCDMA network. Compared with the prior art, the invention can search and register the WCDMA network through the stored frequency point information of the WCDMA network when the mobile terminal roams to other countries, thereby avoiding the problem that 3G and 2G cannot successfully search for the network due to refusal of 4G network search of the mobile terminal, providing the success rate of network search of the mobile terminal in the international roaming state and improving the user experience.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a process flow diagram of a method for searching for international roaming in an exemplary embodiment of the invention;
fig. 2 is a schematic view of a roaming scenario of a mobile terminal in an exemplary embodiment of the present invention;
fig. 3 is a process flow diagram of another method for searching for international roaming in an exemplary embodiment of the invention;
fig. 4 is a hardware configuration diagram of an apparatus for searching a network by international roaming in an exemplary embodiment of the present invention;
fig. 5 is a logical structure diagram of an apparatus for searching a network by international roaming in an exemplary embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, a flowchart of a method for searching a network by international roaming according to an exemplary embodiment of the present invention is shown, where the method is applied to a mobile terminal, and the method includes:
101, when starting up, if judging that the mobile terminal is in an international roaming state, adopting WCDMA to preferentially search for a network;
in this embodiment, after the mobile terminal is turned on to search the network and resides in a cell, the mobile terminal may receive a cell feedback message to obtain a PLMN of the cell, where the PLMN is MCC country code + MNC network code, for example, the PLMN of china mobile is 46000, the PLMN of china unicom is 46001, where "460" is a country code corresponding to china, and the country code corresponding to the usa is "310". When the country codes in the PLMNs of the terminal are different, it can be stated that the terminal is in the international roaming state. Therefore, the mobile terminal can judge whether the terminal is in the international roaming state according to the PLMN of the cell and the HPLMN (Home PLMN) of the SIM card of the mobile terminal itself. If the HPLMN of the terminal is the same as the PLMN of the cell, the terminal is not in the international roaming state; if the HPLMN of the terminal is different from the PLMN of the cell, the terminal is in the international roaming state.
When the mobile terminal is determined to be in the international roaming state, the network searching order of the mobile terminal may be changed to WCDMA (Wideband Code Division Multiple Access) priority. The WCDMA network is the most common network in the world, and the handset supporting the WCDMA network can use the unicode, and is downward compatible with the GSM network, and can also use the mobile card. However, the LTE network belongs to a 4G protocol network, and is less versatile than the WCDMA network. However, since the network searching sequence of the terminal itself is usually the highest priority of the 4G protocol network (i.e. LTE network), the next is the 3G protocol network (i.e. WCDMA network), and the last is the 2G protocol network, in the prior art, after international roaming, the mobile terminal will search the LTE network first according to the priority sequence, but in countries that do not support the LTE network, the mobile terminal will not be able to access the network. The mobile terminal of the invention can firstly obtain the network searching sequence priority list of the mobile terminal after international roaming, and changes the priority of WCDMA in the network searching sequence priority list into the highest priority, thereby leading the mobile terminal to adopt WCDMA to search network preferentially and register WCDMA network. Since the WCDMA network is more general than the LTE network, the mobile terminal can smoothly perform network access in a roaming place through the WCDMA network.
in this embodiment, after the mobile terminal successfully registers to the WCDMA network in the roaming area, the frequency point information of the current WCDMA network may be recorded and stored, and the so-called frequency point information is the basis for the terminal to connect to the network. The mobile terminal may then further determine whether there are available LTE network neighbors.
As an embodiment, determining whether there is an available LTE network neighboring cell specifically includes: firstly, network neighbor information of a roaming area network can be acquired by receiving system information, wherein the network neighbor information comprises network types and frequency point information corresponding to the network neighbors, and the network types generally comprise LTE, WCDMA, 2G and the like; then finding the LTE network adjacent cell from a plurality of surrounding network adjacent cells through the network type; and judging whether the LTE network neighboring cell meets the residence condition or not according to the frequency point information of the LTE network neighboring cell.
As an optional embodiment, the mobile terminal may first detect the signal strength of the LTE network neighboring cell through the frequency point information of the LTE network neighboring cell, then calculate the residence value of the LTE network neighboring cell through the signal strength of the LTE network neighboring cell, and when the residence value is greater than 0, determine that the LTE network neighboring cell meets the residence condition. If the LTE network neighboring cell is determined to be in accordance with the residence condition, determining the LTE network neighboring cell to be an available LTE network neighboring cell; and if the LTE network neighboring cell does not meet the residence condition, determining that the LTE network neighboring cell is an unavailable LTE network neighboring cell.
For example, please refer to fig. 2, which is a schematic view of a scenario after a mobile terminal roams in an exemplary embodiment of the present invention, wherein it is assumed that the mobile terminal obtains messages of 3 network neighboring cells by receiving a system message after connecting to a WCDMA network in a roaming area, where a first neighboring cell is an LTE network neighboring cell, and corresponding frequency point information is a first frequency point; the adjacent cell II is an LTE network adjacent cell, and the corresponding frequency point information is frequency point II; and the adjacent cell III is a 2G network adjacent cell, and the corresponding frequency point information is frequency point III. Then the mobile terminal screens out the adjacent cells of the LTE network, namely an adjacent cell I and an adjacent cell II, through the network type; and then detecting the signal intensity of the first adjacent cell and the second adjacent cell through the frequency point information of the first adjacent cell and the second adjacent cell, and then calculating the residence value of the LTE network adjacent cell according to the signal intensity and a preset algorithm. And the mobile terminal acquires the residence values calculated by the signal intensity of the first adjacent cell and the second adjacent cell, and if the residence values are greater than 0, the adjacent cells of the LTE network accord with the residence conditions. Assuming that the residence value of the first neighboring cell is greater than 0 and the residence value of the second neighboring cell is less than 0, the mobile terminal may determine that the first neighboring cell meets the residence condition and the second neighboring cell does not meet the residence condition, so that the first neighboring cell is used as an available LTE network neighboring cell.
when it is determined that an available LTE network neighborhood exists in the roaming area, the currently connected WCDMA network may be disconnected, and an attempt may be made to register the LTE network through the available LTE network neighborhood. If the LTE network registration is successful, network access can be carried out through the LTE network.
And step 104, if the registration of the LTE network fails, searching and registering the WCDMA network again through the stored frequency point information of the WCDMA network.
If the mobile terminal fails to register the LTE network, the WCDMA network is searched again and registered through the stored frequency point information of the WCDMA network, and the mobile terminal can be directly connected with the WCDMA network through the frequency point information of the WCDMA network because the mobile terminal is successfully registered with the WCDMA network before, so that the rapid recovery of network access is ensured.
In addition, as an embodiment, when the mobile terminal fails to register in the LTE network, the PLMN of the LTE network may be further acquired, the FPLMN list of the mobile terminal recorded in the SIM card of the mobile terminal is acquired, and then it is determined whether the PLMN of the LTE network is in the FPLMN list, and if so, the PLMN of the LTE network is removed from the FPLMN list, so as to avoid that the LTE network is blacklisted and the LTE network cannot be subsequently attempted to be connected again.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the solution of the present invention is further described in detail with reference to fig. 3.
Please refer to fig. 3, which is a flowchart illustrating another method for searching for an international roaming network according to an exemplary embodiment of the present invention, specifically including:
when the mobile terminal is started, the PLMN of a roaming place and the HPLMN of the SIM card of the mobile terminal can be read, whether the mobile terminal is in an international roaming state or not is judged according to the PLMN of the roaming place and the HPLMN, and if the PLMN is the same as the HPLMN, the mobile terminal is not in the international roaming state; if the PLMN is different from the HPLMN, the mobile terminal is in an international roaming state.
If the mobile terminal is in the international roaming state, the network searching sequence can be forcibly modified to be the priority of WCDMA;
305, trying to register the LTE network according to the available LTE network neighboring cell; turning to step 306;
307, performing network access through the LTE network, and ending;
309, removing the PLMN of the LTE network from the FPLMN list, and turning to 310;
and 310, searching again and registering the WCDMA network through the stored frequency point information of the WCDMA network, and ending.
Compared with the prior art, the invention can ensure that the mobile terminal firstly carries out network connection through the WCDMA when roaming to other countries, and then searches and registers the WCDMA network through the stored frequency point information of the WCDMA network when trying to connect the LTE network and breaking the network, thereby ensuring that the terminal can quickly recover the network connection, avoiding the problem that the 3G and 2G can not successfully search the network due to refusal of the 4G network search of the mobile terminal, providing the success rate of the network search of the mobile terminal in the international roaming state and improving the user experience.
Based on the same conception, the invention also provides a device for searching the network by international roaming, which can be realized by software, or by hardware or a combination of the software and the hardware. The device for searching network by international roaming is a logical device, which is operated by reading corresponding computer program instructions in a memory by a CPU of a mobile terminal where the device is located.
Referring to fig. 4, a device 500 for international roaming network searching according to an exemplary embodiment of the present invention is applied to a mobile terminal, and the basic operating environment of the device includes a CPU, a memory and other hardware, and from a logical aspect, the logical structure of the device 500 is as shown in fig. 5, where:
a selecting unit 501, configured to preferentially perform network searching by using WCDMA if the mobile terminal is in an international roaming state when the mobile terminal is turned on;
a determining unit 502, configured to determine whether an available LTE network neighboring cell exists and record frequency point information of the WCDMA network when the WCDMA network is successfully registered;
a first registration unit 503, configured to attempt to register the LTE network when it is determined that an available LTE network neighboring cell exists;
a second registration unit 504, configured to search and register the WCDMA network again through the stored frequency point information of the WCDMA network if registration of the LTE network fails.
Optionally, the selecting unit 501 is specifically configured to obtain a network searching order priority list of itself, and change the priority of the WCDMA in the network searching order priority list to the highest priority.
Optionally, the first registering unit 503 includes:
a searching subunit 5031, configured to obtain network neighboring cell information of the roaming destination network, where the network neighboring cell information includes a network type and frequency point information corresponding to a network neighboring cell; finding an LTE network adjacent area through a network type;
a determining subunit 5032, configured to determine, according to the frequency point information of the LTE network neighboring cell, whether the LTE network neighboring cell meets the residence condition; if yes, determining the LTE network neighboring cell as an available LTE network neighboring cell; if not, determining that the LTE network neighboring cell is the unavailable LTE network neighboring cell.
Optionally, the determining subunit 5032 is specifically configured to detect the signal strength of the LTE network neighboring cell through the frequency point information of the LTE network neighboring cell; calculating a residence value of the LTE network neighboring cell according to the signal intensity of the LTE network neighboring cell; and when the residence value is larger than 0, determining that the LTE network neighboring cell meets the residence condition.
Optionally, the apparatus further comprises:
an information deleting unit 505, configured to, when registration of the LTE network fails, remove the PLMN of the LTE network from the FPLMN list if it is determined that the PLMN of the LTE network is in the FPLMN list of the terminal.
In summary, the present invention can enable the mobile terminal to preferentially perform network searching by using WCDMA if the mobile terminal is in the international roaming state; then when successfully registering to the WCDMA network, determining whether an available LTE network neighboring cell exists and recording frequency point information of the WCDMA network; if so, attempting to register the LTE network; and if the LTE network fails to be registered, searching and registering the WCDMA network again through the stored frequency point information of the WCDMA network. Compared with the prior art, the invention can search and register the WCDMA network through the stored frequency point information of the WCDMA network when the mobile terminal roams to other countries, thereby avoiding the problem that 3G and 2G cannot successfully search for the network due to refusal of 4G network search of the mobile terminal, providing the success rate of network search of the mobile terminal in the international roaming state and improving the user experience.
The implementation process of the functions and actions of each unit in the above device is specifically described in the implementation process of the corresponding step in the above method, and is not described herein again.
For the device embodiments, since they substantially correspond to the method embodiments, reference may be made to the partial description of the method embodiments for relevant points. The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of the application. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for searching a network through international roaming is applied to a mobile terminal, and is characterized in that the method comprises the following steps:
when starting up, if judging that the mobile terminal is in the international roaming state, adopting wideband code division multiple access WCDMA to preferentially search the network;
when successfully registering to the WCDMA network, determining whether an available Long Term Evolution (LTE) network adjacent cell exists and recording frequency point information of the WCDMA network;
if so, attempting to register the LTE network;
if the LTE network fails to be registered, searching, registering and connecting to the WCDMA network again through the stored frequency point information of the WCDMA network.
2. The method according to claim 1, wherein the searching for the network by using wideband code division multiple access WCDMA is performed preferentially, specifically:
and acquiring a network searching sequence priority list of the user, and changing the priority of the WCDMA in the network searching sequence priority list into the highest priority.
3. The method of claim 1, wherein the specific method for determining whether there is an available LTE network neighboring cell is:
acquiring network neighbor cell information of a roaming ground network, wherein the network neighbor cell information comprises network types and frequency point information corresponding to network neighbor cells;
finding an LTE network adjacent area through a network type;
judging whether the LTE network neighboring cell meets the residence condition or not according to the frequency point information of the LTE network neighboring cell; if yes, determining the LTE network neighboring cell as an available LTE network neighboring cell; if not, determining that the LTE network neighboring cell is the unavailable LTE network neighboring cell.
4. The method of claim 3, wherein the determining whether the LTE network neighboring cell meets the camping condition according to the frequency point information of the LTE network neighboring cell specifically comprises:
detecting the signal intensity of the LTE network neighboring cell through the frequency point information of the LTE network neighboring cell;
calculating a residence value of the LTE network neighboring cell according to the signal intensity of the LTE network neighboring cell;
and when the residence value is larger than 0, determining that the LTE network neighboring cell meets the residence condition.
5. The method of claim 1, wherein when registering with the LTE network fails, the method further comprises:
and if the PLMN of the LTE network is determined to be in the forbidden public land mobile network FPLMN list of the terminal, removing the PLMN of the LTE network from the FPLMN list.
6. An apparatus for searching a network in international roaming, applied to a mobile terminal, the apparatus comprising:
the selection unit is used for preferentially searching the network by adopting the WCDMA if the mobile terminal is judged to be in the international roaming state when the mobile terminal is started;
the determining unit is used for determining whether an available LTE network neighboring cell exists and recording frequency point information of the WCDMA network when the WCDMA network is successfully registered;
the first registration unit is used for trying to register the LTE network when the fact that the available LTE network neighboring cell exists is determined;
and the second registration unit is used for searching, registering and connecting to the WCDMA network again through the stored frequency point information of the WCDMA network when the registration of the LTE network fails.
7. The apparatus of claim 6,
the selection unit is specifically configured to obtain a network searching sequence priority list of the selection unit, and change the priority of the WCDMA in the network searching sequence priority list to the highest priority.
8. The apparatus of claim 6, wherein the first registration unit comprises:
the network neighbor cell searching unit is used for obtaining network neighbor cell information of a roaming ground network, wherein the network neighbor cell information comprises network types and frequency point information corresponding to network neighbor cells; finding an LTE network adjacent area through a network type;
the judging subunit is used for judging whether the LTE network neighboring cell meets the residence condition or not according to the frequency point information of the LTE network neighboring cell; if yes, determining the LTE network neighboring cell as an available LTE network neighboring cell; if not, determining that the LTE network neighboring cell is the unavailable LTE network neighboring cell.
9. The apparatus of claim 8,
the judging subunit is specifically configured to detect the signal strength of the LTE network neighboring cell through the frequency point information of the LTE network neighboring cell; calculating a residence value of the LTE network neighboring cell according to the signal intensity of the LTE network neighboring cell; and when the residence value is larger than 0, determining that the LTE network neighboring cell meets the residence condition.
10. The apparatus of claim 6, further comprising:
and the information deleting unit is used for removing the PLMN of the LTE network from the FPLMN list if the PLMN of the LTE network is determined to be in the FPLMN list of the terminal when the registration of the LTE network fails.
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| CN110830981A (en) * | 2018-08-14 | 2020-02-21 | 展讯通信（上海）有限公司 | Automatic attempt method and device for forbidden network and mobile terminal |
| CN109257800A (en) * | 2018-10-13 | 2019-01-22 | Oppo广东移动通信有限公司 | Communication network cut-in method, electronic device and computer readable storage medium |
| CN109257801A (en) * | 2018-10-26 | 2019-01-22 | Oppo广东移动通信有限公司 | Communication network cut-in method, electronic device and computer readable storage medium |
| CN109041168A (en) * | 2018-10-26 | 2018-12-18 | Oppo广东移动通信有限公司 | Communication network cut-in method, electronic device and computer readable storage medium |
| CN110708738B (en) | 2019-09-29 | 2021-11-19 | 维沃移动通信有限公司 | Network information processing method and terminal equipment |
| CN111182613B (en) * | 2019-12-20 | 2021-02-02 | 翱捷科技股份有限公司 | Multi-mode mobile terminal and network searching method thereof |
| CN116744434B (en) * | 2023-08-15 | 2023-11-07 | 荣耀终端有限公司 | Communication method, storage medium and electronic equipment |
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Address after: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee after: Qingdao Hisense Mobile Communication Technology Co.,Ltd. Address before: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee before: HISENSE MOBILE COMMUNICATIONS TECHNOLOGY Co.,Ltd. |