WO2018149046A1 - Plmn selection method and ivs - Google Patents

Abstract

The application discloses a public land mobile network (PLMN) selection method and an in-vehicle system (IVS). The method comprises: upon initialization of an IVS or triggering a PLMN reselection, the IVS selecting, from at least one preconfigured PLMN, a target PLMN, wherein a public safety answering point (PSAP) is deployed in the at least one preconfigured PLMN; measuring an indicator of the target PLMN; when the indicator of the target PLMN reaches a preconfigured threshold, accessing the target PLMN to enable the IVS to transmit data to the PSAP in the target PLMN. The method can be utilized to ensure that a PSAP is deployed in a PLMN accessed by an IVS, ensuring a same encoding method is employed in a transmission process of a minimum set of data (MSD), thereby ensuring reliability of MSD transmission.

Description

A method for selecting PLMN and IVS

This application claims priority from the Chinese Patent Application submitted to the China Patent Office on February 17, 2017, with the application number of 201710086815.X, and the invention titled "A Method and Equipment for Improving the Reliability of Transmission of MSD Data Across Operator Networks" The entire content of which is incorporated herein by reference.

Technical field

The present application relates to the field of communications technologies, and in particular, to a method for selecting a Public Land Mobile Network (PLMN) and an In-Vehicle System (IVS).

Background technique

At present, in the vehicle related services such as Emergency Call (Ecall), Breakdown Call (Bcall), and Information Call (Icall), the Minimum Set of Data (MSD) is used to transmit the vehicle. Related information, the MSD transmits through the voice channel.

Taking Ecall as an example, when a vehicle with Ecall function is deployed, the person in the vehicle can actively trigger the Ecall service or passively trigger the Ecall service by the in-vehicle sensor. After the Ecall service is triggered, the IVS sends the MSD to the nearest Public Safety Answering Point (PSAP), which may include time, location, driving direction, vehicle identification, vehicle diagnostic information, and number of passengers in the vehicle. And other information. The PSAP back office staff dispatched the relevant rescue team to quickly arrive at the scene of the traffic accident according to the information contained in the received MSD.

Due to the particularity of the MSD, it is necessary to ensure the reliability during the MSD transmission process, so that the PSAP receives the correct MSD and provides the corresponding rescue service.

Summary of the invention

The present application provides a method for selecting a PLMN and an IVS. By selecting a target PLMN access in a preset PLMN, it is possible to ensure that a PSAP is deployed in the accessed PLMN, which can avoid coding conversion of the MSD during transmission, and ensure MSD transmission. Reliability.

In a first aspect, the present application provides a method for selecting a PLMN, which is applied to an IVS side, and the method includes:

The IVS selects a target PLMN from the at least one preset PLMN when the IVS initializes or triggers the PLMN reselection, wherein the PSAP is deployed in the at least one preset PLMN; the indicator of the target PLMN is measured; at the target PLMN If the indicator reaches a preset threshold, the target PLMN is accessed to cause the IVS to send data to the PSAP in the target PLMN.

Here, the information of the preset PLMN is pre-stored in the IVS, and the preset PLMN may include the following situations:

First, only one preset PLMN is stored in the IVS, and the preset PLMN belongs to the first operator. Understandably, this situation is more applicable to the scenario where only one operator has PSAP deployment rights, and the operator deploys the PSAP only in one of its subordinate PLMNs. It should be noted that this situation is more suitable for the use scenario of Ecall.

Second, a plurality of preset PLMNs are stored in the IVS, and the plurality of preset PLMNs belong to the first operator. Can Understandably, this situation is more applicable to the scenario where only one operator has PSAP deployment rights, and the operator deploys a PSAP in multiple PLMNs of its subordinates. It should be noted that this situation is more applicable to the use scenarios of commercial service telephone services such as Icall and Bcall.

Thirdly, a plurality of preset PLMNs are stored in the IVS, and the preset PLMNs include a preset PLMN belonging to the first operator and a preset PLMN belonging to the second operator. Understandably, this situation is more suitable for scenarios where multiple operators have PSAP deployment rights. It should be noted that this situation is more applicable to the use scenarios of commercial service telephone services such as Icall and Bcall.

In conjunction with the first aspect, in some embodiments, when a plurality of preset PLMNs are stored in the IVS, the IVS may select a target PLMN from the at least one preset PLMN according to the following selection policy:

First, the IVS selects, from the plurality of preset PLMNs, the preset PLMN registered before the last shutdown or the off-network as the target PLMN.

Second, the IVS selects the preset PLMN with the highest priority from the plurality of preset PLMNs as the target PLMN.

Third, the IVS selects the preset PLMN to which the IVS belongs from the plurality of preset PLMNs as the target PLMN.

Fourth, the IVS selects a user-specified preset PLMN as a target PLMN from a plurality of preset PLMNs.

It should be noted that, instead of being limited to the foregoing four selection policies, the IVS may arbitrarily select one preset PLMN as the target PLMN among the plurality of preset PLMNs, or may select the strongest signal among the plurality of preset PLMNs. Or a preset PLMN with the best indicator as the target PLMN, which is not limited in this application.

With reference to the first aspect, in some embodiments, the at least one preset PLMN includes a preset PLMN belonging to the first operator and a preset PLMN belonging to the second operator, where the belonging to the first operator The priority level of the preset PLMN is higher than the priority level of the preset PLMN belonging to the second operator; the selecting the target PLMN from the at least one preset PLMN includes: the IVS is from the at least one preset PLMN according to the priority level. Select the target PLMN.

With reference to the first aspect, in some embodiments, if the indicator of the preset PLMN in the at least one preset PLMN reaches a preset threshold, the method may also select the PLMN access in the following two manners:

First, the IVS accesses an optimal preset PLMN, wherein the optimal preset PLMN is a preset PLMN whose index is the best among the at least one preset PLMN.

The second type, the IVS access indicator is an optimal PLMN, wherein the indicator optimal PLMN is a PLMN that is the best indicator among the at least one preset PLMN and the at least one non-preset PLMN, the at least one non The PSAP is not deployed in the preset PLMN.

In conjunction with the first aspect, in some embodiments, the data is an MSD.

In a second aspect, the application provides an IVS, including: a processor, a memory, and a transceiver, wherein:

The memory is configured to store at least one preset PLMN, wherein a PSAP is deployed in the at least one preset PLMN;

The processor is configured to select a target PLMN from the at least one preset PLMN when the IVS initializes or triggers a PLMN reselection;

The processor is further configured to measure an indicator of the target PLMN;

The transceiver is configured to access the target PLMN to send data to a PSAP in the target PLMN if an indicator of the target PLMN reaches a preset threshold.

In conjunction with the second aspect, in some embodiments, the preset PLMN stored in the memory can include one of the following:

First, only one preset PLMN is stored in the memory, and the preset PLMN belongs to the first operator. Understandably, this situation is more applicable to the scenario where only one operator has PSAP deployment rights, and the operator deploys the PSAP only in one of its subordinate PLMNs. It should be noted that this situation is more suitable for the use scenario of Ecall.

Second, the memory stores a plurality of preset PLMNs, and the plurality of preset PLMNs belong to the first operator. Understandably, this situation is more applicable to the scenario where only one operator has PSAP deployment rights, and the operator deploys a PSAP in multiple PLMNs of its subordinates. It should be noted that this situation is more applicable to the use scenarios of commercial service telephone services such as Icall and Bcall.

Thirdly, the memory stores a plurality of preset PLMNs, wherein the plurality of preset PLMNs include a preset PLMN belonging to the first operator and a preset PLMN belonging to the second operator. Understandably, this situation is more suitable for scenarios where multiple operators have PSAP deployment rights. It should be noted that this situation is more applicable to the use scenarios of commercial service telephone services such as Icall and Bcall.

With reference to the second aspect, in some embodiments, when a plurality of preset PLMNs are stored in the memory, the processor may select a target PLMN from the at least one preset PLMN according to the following selection policy:

First, the processor selects, from the plurality of preset PLMNs, the preset PLMN that was last turned off or registered before the off-network as the target PLMN.

Second, the processor selects the preset PLMN with the highest priority from the plurality of preset PLMNs as the target PLMN.

Third, the processor selects the preset PLMN to which the IVS belongs from the plurality of preset PLMNs as the target PLMN.

Fourth, the processor selects a user-specified preset PLMN as a target PLMN from a plurality of preset PLMNs.

It should be noted that, the processor is not limited to the foregoing four selection policies, and the processor may arbitrarily select one preset PLMN as the target PLMN among the plurality of preset PLMNs, and may also select the most signal among the plurality of preset PLMNs. A preset PLMN with strong or optimal index is used as the target PLMN, which is not limited in this application.

With reference to the second aspect, in some embodiments, the at least one preset PLMN includes a preset PLMN belonging to the first operator and a preset PLMN belonging to the second operator, where the first carrier belongs to the first carrier. The priority level of the preset PLMN is higher than the priority level of the preset PLMN belonging to the second operator; the processor selecting the target PLMN from the at least one preset PLMN comprises: the processor is from at least one preset according to the priority level The target PLMN is selected in the PLMN.

With reference to the second aspect, in some embodiments, if the indicator of the preset PLMN in the at least one preset PLMN reaches a preset threshold, the processor may be further configured to instruct the transceiver to access the optimal preset PLMN. The optimal preset PLMN is a preset PLMN that is optimal in the at least one preset PLMN; the transceiver is further configured to access the optimal preset PLMN, or

The processor may be further configured to instruct the transceiver to access an indicator optimal PLMN, wherein the indicator optimal PLMN For the PLMN in the at least one preset PLMN and the at least one non-pre-set PLMN, the PSAP is not deployed in the at least one non-pre-populated PLMN; the transceiver is further configured to access the indicator optimal PLMN.

In connection with the second aspect, the data is an MSD.

In a third aspect, the application provides an IVS, including: a processing unit, a storage unit, and an access unit, where:

The storage unit is configured to store at least one preset PLMN, wherein a PSAP is deployed in the at least one preset PLMN;

The processing unit is configured to select a target PLMN from the at least one preset PLMN when the IVS initializes or triggers a PLMN reselection;

The processing unit is further configured to measure an indicator of the target PLMN;

The access unit is configured to access the target PLMN to send data to a PSAP in the target PLMN if an indicator of the target PLMN reaches a preset threshold.

It can be understood that the functional unit included in the IVS can be used to perform the method of the above first aspect, and the specific description can be referred to.

In a fourth aspect, the present application provides a computer readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the first aspect and the first Any one of the various possible implementations on the one hand.

In a fifth aspect, the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform any one of the first aspect and each of the possible implementations of the first aspect.

By implementing the present application, by selecting a PLMN access in a preset PLMN and ensuring that a PSAP is deployed in the accessed PLMN, it is ensured that the MSD uses the same coding mode in the transmission process, thereby avoiding coding conversion in the MSD transmission process, thereby ensuring Reliability of MSD transmission. The implementation of the present application can ensure that the MSD is accurately transmitted to the PSAP, so that the PSAP can provide a corresponding service for the vehicle, and can reduce the loss caused by the accident or failure of the vehicle.

DRAWINGS

In order to more clearly illustrate the technical solutions in the present application or the background art, the drawings to be used in the present application or the background art will be described below.

FIG. 1 is a schematic diagram of a transmission process of an MSD in the prior art.

2 is a speech diagram of a prior art MSD transmission in a cross-communication carrier.

FIG. 3 is a schematic diagram of PSAP paging after an IVS accesses a PLMN deployed with a PSAP provided by the present application.

4 is a schematic diagram of performing PSAP paging after an IVS accesses a PLMN without a PSAP provided by the present application.

FIG. 5 is a schematic diagram of a PSAP deployed in a PLMN under the first operator provided by the present application.

FIG. 6 is a schematic diagram of a PSAP deployed in multiple PLMNs under the first operator provided by the present application.

FIG. 7 is a schematic diagram of a PSAP deployed in a plurality of PLMNs under the first operator and the second operator provided by the present application.

FIG. 8 is a schematic flow chart of a method for selecting a PLMN provided by the present application.

FIG. 9 is a schematic diagram of a process of an IVS transmission MSD provided by the present application.

FIG. 10 is a schematic flowchart diagram of another method for selecting a PLMN provided by the present application.

FIG. 11 is a schematic flowchart diagram of still another method for selecting a PLMN provided by the present application.

FIG. 12 is a structural block diagram of an implementation manner of an IVS provided by the present application.

FIG. 13 is a functional block diagram of an IVS provided by the present application.

detailed description

The present application is described below in conjunction with the drawings in the present application.

Referring to FIG. 1, FIG. 1 is a schematic diagram showing a process of transferring an MSD from an IVS to a PSAP in the prior art related to the present application. As shown in FIG. 1, the transmission process of the MSD may include the following steps:

Step 1. The IVS sends the MSD.

Step 2: The MSD transmits the access PLMN to the IVS. The access PLMN of the IVS depends on the PLMN selection process of the IVS. It can be understood that the base station and the mobile switching center included in the access PLMN are only exemplarily listed in FIG. 1. In actuality, the access PLMN may include more network elements, for example, a home location register (Home Location Register (HLR), Authentication Center (AUC), Equipment Identity Register (EIR), etc.

Step 3: The MSD is transmitted to the Public Switched Telephone Network (PSTN) by accessing the PLMN.

Step 4: The MSD is transmitted to the destination PLMN where the PSAP is deployed through the PSTN. A PSAP is deployed in the destination PLMN. Optionally, the destination PLMN may be a PLMN deployed with a PSAP closest to the vehicle where the IVS is located. The PLMN in which the PSAP is deployed belongs to the PSAP service provider. It can be understood that the fixed-line switching center and the PSAP included in the destination PLMN are exemplarily listed in FIG. 1. In actuality, the destination PLMN may include more network elements.

Step 5. The MSD transmits to the PSAP in the destination PLMN.

Since the MSD is transmitted over the voice channel, the MSD needs to encode and decode to accommodate the voice channel when passing through the access PLMN and the destination PLMN.

It can be seen from FIG. 1 that in the transmission process of the foregoing MSD, the access PLMN and the destination PLMN of the IVS are not the same PLMN, and the access PLMN of the IVS and the communication carrier to which the destination PLMN belongs cannot be guaranteed to be the same. In general, different communication carriers use different air interface coding methods to encode and decode the MSD. For example, when the MSD transmits in the PLMN subordinate to the communication carrier A, the coding mode 1 may be used for encoding and decoding. The MSD is in the MSD. When transmitting through a PLMN subordinate to the communication carrier B, it is possible to perform coding and decoding work using the coding mode 2. Therefore, when the MSD is transmitted between PLMNs under different communication carriers, the MSD is easily lost or deformed due to the conversion of the coding mode. In this case, the reliability of the MSD transmission will be greatly affected, which may delay the rescue progress.

For example, it is assumed that the access PLMN of the IVS belongs to the communication carrier A, and the communication carrier A uses the Wideband Code Division Multiple Access Adaptive Multi-Rate Wideband (WCDMA AMR-WB). Coding, the destination PLMN (with PSAP deployed) belongs to the communication carrier B, and the communication carrier B uses the Global System for Mobile Communication Adaptive Multi-Rate Narrowband (GSM AMR-NB) for encoding. Referring to FIG. 2, the left diagram of FIG. 2 shows the spectrum of the uplink MSD sent by the IVS to the access PLMN, and the right diagram shows the PSAP reception. The spectrum of the downlink MSD. As can be seen from FIG. 2, in the prior art, the MSD is distorted in the case of transmission across the communication carrier, and data reliability cannot be guaranteed.

Since the above prior art cannot guarantee the reliability of the MSD transmission, the present application provides a method for selecting a PLMN, the IVS selects a target PLMN access from at least one preset PLMN, and transmits the MSD using the target PLMN. The PSAP is deployed in the at least one preset PLMN. The method can ensure that the IVS accesses the PLMN where the PSAP is located, that is, the IVS and the PSAP use the same PLMN. It can be understood that the data is encoded and decoded in the same PLMN by using a certain encoding manner, so that in the present application, the MSD does not have the problem of transcoding when encoding and decoding in the transmission process, and does not cause the MSD. Distortion or distortion ensures the reliability of MSD transmission.

In order to better understand the method of the present application, the PLMN is first introduced in detail. PLMN is a network established and operated by the government or its approved operators to provide the public with the purpose of land mobile communication services. For example, in China, operators such as China Mobile, China Unicom, and telecommunications include one or more PLMNs. In France, operators such as Orange, SFR, and Bouygues also deploy one or more PLMNs. Each PLMN has a unique identifier, and the identity of the PLMN is composed of a Mobile Country Code (MCC) and a Mobile Country Code (MNC). For example, in China, the identity of one of the PLMNs moved by the operator is 46000, of which 460 is MCC and 00 is MNC. In France, one of the PLMNs of the operator Orange is identified as 20801. 208 is MCC and 01 is MNC.

It should be understood that although at least one PLMN under each operator can provide the land mobile communication service to the public, the PSAP cannot be deployed in the PLMN under each operator. Among them, the deployment rights of the PSAP are generally given by the government to each operator. That is, only the operator with the PSAP deployment authority can deploy the PSAP in one or more of its subordinate PLMNs to provide the PSAP service to the public.

In the present application, the PLMN can be divided into two categories: a PLMN in which a PSAP is deployed and a PLMN in which a PSAP is not deployed.

The first category is a PLMN with a PSAP deployed. In this category, a PSAP is deployed in the PLMN, ie, the PSAP is bound to the PLMN. After the IVS selects the PLMN to be deployed with the PSAP, when the PSAP paging is required to establish a connection with the PSAP, the PSAP deployed in the PLMN accessed by the IVS is bound to be called. Referring to FIG. 3, FIG. 3 is a schematic diagram of an IVS accessing a PLMN deployed with a PSAP provided by the present application. As shown in the figure, when PSAP 1 is deployed in PLMN 1, when IVS accesses PLMN 1 and PSAP paging, it will inevitably page to PSAP 1.

In the second category, there is no PLMN where the PSAP is deployed. In this category, no PSAP is set in the PLMN. After the IVS is selected and the PMN is not deployed, the PSAP needs to be connected to the PMN where the PSAP is deployed to successfully call the PSAP. Referring to FIG. 4, FIG. 4 is a schematic diagram of a PSAP paging after an IVS accessing a PLMN without a PSAP provided by the present application. As shown in the figure, PSAP is not deployed in PLMN1, PSAP2 is deployed in PLMN2. When IVS accesses PLMN1 and pages PSAP, IVS needs to connect to PLMN2 through PLMN 1, and then PMN2 through PLMN2.

In order to better understand the method of the present application, the preset PLMN in the IVS will be described in detail first. In the present application, the preset PLMNs belong to the second type of PLMN, that is, the PSAP is deployed in the preset PLMN. In IVS The deployment rights of the preset PLMN and PSAP are related to the specific deployment situation, which is described in detail below.

(1) Only one preset PLMN is stored in the IVS, and the preset PLMN belongs to the first operator.

Understandably, this situation is more applicable to the scenario where only one operator has PSAP deployment rights, and the operator deploys the PSAP only in one of its subordinate PLMNs. Here, the operator who has the PSAP deployment authority can be referred to as the first carrier.

The PLMN in which the PSAP is deployed in the first operation can provide the PSAP service for the agreed area, and the agreed area can be a country area or a city area. Referring to FIG. 5, FIG. 5 is a schematic diagram of a PSAP deployed in a PLMN under the first operator provided by the present application. As shown in the figure, the PLMN deploying the PSAP under the first operator can provide a PSAP service for the agreed area.

In the case where there is only one PLMN in which the PSAP is deployed in the first operator, the IVS stores related information of the PLMN and sets the PLMN as a preset PLMN. For example, suppose that the Chinese government gives the PSAP deployment authority of the China region to the mobile, and the mobile only deploys the PSAP in the 46000 PLMN belonging to it, then the IVS stores the relevant information of the 46000 PLMN, and sets the 46000 PLMN as the preset PLMN. For another example, suppose that the Chinese government has granted the PSAP deployment authority of the China region to China Unicom, and Unicom deployed the PSAP in its 46001PLMN, then the IVS stores the relevant information of the 46001 PLMN and sets the 46001 PLMN as the preset PLMN.

It can be understood that the case where the PSAP is deployed in one PLMN described in the above (1) is more suitable for the use scenario of the Ecall.

(2) A plurality of preset PLMNs are stored in the IVS, and the plurality of preset PLMNs belong to the first operator.

Understandably, this situation is more applicable to the scenario where only one operator has PSAP deployment rights, and the operator deploys a PSAP in multiple PLMNs of its subordinates. Here, the operator who has the PSAP deployment authority can be referred to as the first carrier.

Among them, multiple PLMNs deployed by the first operator with PSAPs can provide PSAP services for different regions. Referring to FIG. 6, FIG. 6 is a schematic diagram of a PSAP deployed in multiple PLMNs under the first operator provided by the present application. As shown in FIG. 6, the first operator has n PLMNs deployed with a PSAP, wherein PMN 1 is deployed in PLMN 1, PSAP 2 is deployed in PLMN 2, and so on, and PSAP is deployed in PLMN n. n. Alternatively, PLMN 1 may provide PSAP services for Region 1, PLMN 2 may provide PSAP services for Region 2, and PLMN n may provide PSAP services for Region n. It should be noted that when multiple PMNs deployed by the first operator provide PSAP services for each region, there may be overlapping areas between the regions, or multiple deployments of PSAPs under the first carrier. The PLMN can also provide PSAP services for the same region at the same time.

In a case where there are a plurality of PLMNs in which the PSAP is deployed in the first operator, the IVS stores information about a plurality of PLMNs in which the PSAPs are deployed, and sets the plurality of PLMNs in which the PSAPs are deployed as preset PLMNs. For example, if the Chinese government grants PSAP deployment rights to China Mobile, and the mobile deploys PSAP in its 46000PLMN and 46002PLMN, the IVS can store information about at least one of 46000 PLMN or 46002PLMN, and At least one of 46000 PLMN or 46002 PLMN is set as a preset PLMN.

Referring to Table 1, Table 1 shows information about the preset PLMN stored by the IVS in a specific embodiment.

Serial number

Preset PLMN

PLMN logo

Deployed PSAP

Own carrier

1	Preset PLMN1		Logo 1	PSAP1		First operator
2	Preset PLMN2		Logo 2	PSAP2	First operator
...	...	...	...	...
n	Preset PLMNn	Identification n	PSAPn	First operator

Table 1

As shown in Table 1, the IVS stores related information of n preset PLMNs, wherein PSAP1 is deployed in the first preset PLMN, PSAP2 is deployed in the second preset PLMN, and so on. PSAPn is deployed in n preset PLMNs.

It can be understood that the related information of the preset PLMN stored in the IVS is not limited to the items listed in the above table. In actual applications, more abundant information may be stored in the IVS. For example, the IVS may also store the area coverage of each of the preset PLMNs and the like.

It can be understood that, in a specific implementation, the preset PLMN in the IVS may be stored in the manner shown in Table 1 above, or may directly store related information of the at least one preset PLMN without using a list storage manner. In the SIM card or USIM card or other storage device in the IVS.

It can be understood that, in the case of deploying a PSAP in multiple PLMNs as described in the above (2), and the multiple PLMNs belong to the same operator, it is more suitable for the use scenario of commercial service telephone services such as Icall and Bcall.

(3) A plurality of preset PLMNs are stored in the IVS, and the preset PLMNs include a preset PLMN belonging to the first operator and a preset PLMN belonging to the second operator.

Understandably, this situation is more suitable for scenarios where multiple operators have PSAP deployment rights. Here, the two operators have PSAP deployment rights as an example. One operator with PSAP deployment rights can be referred to as the first carrier, and another operator with PSAP deployment rights is called the second carrier. The first operator may deploy the PSAP in at least one of its subordinate PLMNs, and the second operator may also deploy the PSAP in at least one of its subordinate PLMNs.

Among them, the first operator and the second operator can provide PSAP services for different regions respectively. Referring to FIG. 7, FIG. 7 is a schematic diagram of a PSAP deployed in a plurality of PLMNs in a first carrier and a second carrier provided by the present application.

As shown in FIG. 7, the first operator provides a PSAP service for the area 1, and the first operator has m PLMNs with PSAPs deployed. Among them, PSAP 1 is deployed in PLMN 1, PSAP 2 is deployed in PLMN 2, and so on, PSAP m is deployed in PLMN m. Alternatively, PLMN 1 may provide PSAP service for sub-area 1, PLMN2 may provide PSAP service for sub-area 2, and PLMN m may provide PSAP service for sub-area m.

As shown in FIG. 7, the second operator provides a PSAP service for the region 2, and the second operator has n-m PLMNs with PSAPs deployed. Among them, PSAP m+1 is deployed in PLMN m+1, and PSAP n is deployed in PLMN n. Optionally, the PLMN m+1 may provide a PSAP service for the sub-region m+1, and the PLMN n may provide the PSAP service for the sub-region n.

It should be noted that when multiple PMNs deployed by the first operator and the second operator respectively provide PSAP services for each region, there may be overlapping areas between the regions, or the first carrier and the first Multiple PLMNs deployed under the operator with PSAP can also provide PSAP services for the same region at the same time.

In a case where at least one of the first operator and the second operator has a PLMN in which the PSAP is deployed, the IVS stores information about a plurality of PLMNs in which the PSAP is deployed, and the plurality of PLMNs deployed with the PSAP Set to preset PLMN. For example, suppose the Chinese government grants the PSAP deployment authority to Mobile and China Unicom, and the mobile deploys the PSAP in its 46000PLMN and 46002PLMN. Unicom deploys the PSAP in its 46001PLMN, then the IVS can store 46000PLMN, 46002PLMN or Information about any of the PLMNs in the 46001 PLMN, and any of the 46000 PLMN, 46002 PLMN, or 46001 PLMN is set as the preset PLMN.

See Table 2, which shows information about the preset PLMN stored by the IVS in a particular embodiment.

Serial number	Preset PLMN	PLMN logo	Deployed PSAP	Own carrier
1	Preset PLMN1		Logo 1	PSAP1	First operator
...	...	...	...	...
m	Preset PLMN m	Mark m	PSAP m	First operator
m+1	Preset PLMN m+1	Mark m+1	PSAP m+1	Second operator
...	...	...	...	...
n	Preset PLMN n	Identification n	PSAP n	Second operator

Table 2

As shown in Table 1, the related information of n preset PLMNs is stored in the IVS. Among them, there are m preset PLMNs belonging to the first operation, and n-m preset PLMNs belong to the second operator. PSAP1 is deployed in the first preset PLMN, PSAP 2 is deployed in the second preset PLMN, and so on, PSAP m is deployed in the mth preset PLMN, and PSAP n is deployed in the nth preset PLMN.

It can be understood that the related information of the preset PLMN stored in the IVS is not limited to the items listed in the above table. In actual applications, more abundant information may be stored in the IVS. For example, the IVS may also store the area coverage of each of the preset PLMNs and the like.

It can be understood that, in a specific implementation, the preset PLMN in the IVS may be stored in the manner shown in Table 2 above, or may directly store related information of the at least one preset PLMN without using a list storage manner. In the SIM card or USIM card or other storage device in the IVS.

It can be understood that, in the case that the PSAP is deployed in multiple PLMNs as described in the above (3), and the multiple PLMNs can belong to different operators respectively, it is more suitable for the usage scenarios of commercial service telephone services such as Icall and Bcall.

The above details the various cases of the preset PLMN in the IVS in the present application, and the method of the present application will be described below in conjunction with the above various cases.

First, in the present application, the IVS can be triggered to perform the method of selecting a PLMN in the present application in the following two cases.

First, when the IVS is initialized, it is necessary to select a PLMN access, and perform the method of selecting a PLMN in the present application. After the selected access PLMN, the IVS selects one cell to camp in the cell belonging to the access PLMN and initiates a registration procedure. In this case, after the IVS accesses the PLMN, when the IVS initiates an Ecall, a Bcall, an Icall, and the like, and needs to transmit a vehicle related service of the MSD, the MSD may be directly transmitted through the selected access PLMN.

Second, when the IVS performs the operation of the PLMN reselection, the method of selecting the PLMN in the present application is performed.

In some embodiments, after the IVS accesses a certain PLMN, periodically confirm whether there is a better one. The PLMN periodically performs an operation of PLMN reselection, that is, a method of selecting a PLMN in the present application is periodically performed.

In other embodiments, the PLMN currently accessed by the IVS is not applicable, and the IVS performs the operation of the PLMN reselection, that is, the IVS performs the method of selecting the PLMN in the present application to select one. Better PLMN access. For example, when the PLMN currently accessed by the IVS is not the home PLMN of the IVS, or the signal strength of the PLMN currently accessed by the IVS is poor, the IVS performs the method of selecting the PLMN in this application.

In other embodiments, when the IVS initiates an Ecall, a Bcall, an Icall, or the like that needs to transmit a vehicle related service of the MSD, the IVS performs an operation of the PLMN reselection, that is, performs the method of selecting the PLMN. In this case, the IVS has already accessed a certain PLMN at the time of initialization, but the PLMN accessed at the time of initialization does not necessarily have a PSAP deployed. By performing the method of selecting a PLMN in the present application, the IVS reselects a PLMN access belonging to a PSAP service provider, deployed with a PSAP, and transmits the MSD through the selected PLMN.

Please refer to FIG. 8. FIG. 8 is a schematic flowchart diagram of a method for selecting a PLMN provided by the present application. In the method embodiment shown in FIG. 8, the preset PLMN in the IVS is in the above (1) case, that is, the first operator has the PSAP deployment authority, and the first operator is deployed only in one of the subordinate PLMNs. The PSAP. The IVS sets the PLMN as a preset PLMN. The method can include the following steps:

S101. The IVS selects the preset PLMN as the target PLMN, where the PSAP is deployed in the preset PLMN.

Here, there is only one preset PLMN in the IVS, that is, the only one of the first operators that is deployed with the PSAP. That is, the IVS selects a PLMN that is unique to the first operator and deploys the PSAP as the target PLMN.

S102. Measure an indicator of the target PLMN.

Specifically, a PLMN includes a plurality of cells (Cells), and the indicator of the PLMN is a corresponding indicator of the indicator optimal cell among the plurality of cells in the PLMN. For example, the indicator of one PLMN may be an indicator corresponding to a cell with the best indicator under the PLMN. In this application, the target PLMN may have one or more indicators, including signal strength, signal to noise ratio, Received Signal Strength Indication (RSSI), and Received Signal Code Powe (Received Signal Code Powe, RSCP), Energy Chip/Interfere Other Cell (Ec/Io) from other cells.

S103. If the indicator of the target PLMN reaches a preset threshold, access the target PLMN, so that the IVS sends data to the PSAP in the target PLMN.

In the present application, the IVS stores in advance a preset threshold corresponding to each indicator. The indicator of the target PLMN reaches a corresponding preset threshold, indicating that the indicator of the target PLMN is good, and data can be transmitted normally or efficiently.

Accessing the target PLMN, it can be ensured that a PSAP is deployed in the access PLMN of the IVS, and the IVS can send data to the PSAP in the target PLMN.

In the present application, after the IVS accesses the target PLMN, when initiating Ecall, Bcall, Icall, and the like, the MSD may be sent to the PSAP in the target PLMN, so that the PSAP provides a corresponding service for the vehicle.

Referring to FIG. 9, FIG. 9 illustrates a process in which the IVS transmits an MSD after implementing the method for selecting a PLMN according to the present application. Here, in comparison with FIG. 1, the access PLMN and the destination PLMN of the IVS in FIG. 1 are PLMNs under different operators, and the access PLMN and the destination PLMN use different coding modes, and the MSD is encoded and converted during transmission. Reliability is affected. As shown in FIG. 9, after the method described in this application is implemented, the access PLMN and the destination PLMN are the same PLMN, and the MSD uses the same coding mode during transmission, thereby avoiding the coding conversion of the MSD during transmission, and ensuring transmission. The reliability of the MSD in the process. The implementation of the present application can ensure that the MSD is accurately transmitted to the PSAP, so that the PSAP can provide a corresponding service for the vehicle, and can reduce the loss caused by the accident or failure of the vehicle.

Please refer to FIG. 10. FIG. 10 is a schematic flowchart diagram of another method for selecting a PLMN provided by the present application. The difference between the embodiment of FIG. 10 and the embodiment of FIG. 8 is that in the method embodiment shown in FIG. 10, the preset PLMN is in the above (2) or (3) cases, that is, the preset PLMN has Multiple, the plurality of preset PLMNs may belong to the same operator, or may belong to different operators. The method can include the following steps:

S201. The IVS selects a target PLMN from the plurality of preset PLMNs, wherein the PSAPs are deployed in the plurality of preset PLMNs.

In the present application, the IVS may select a target PLMN from a plurality of preset PLMNs according to different policies, as follows:

First, the IVS selects, from the plurality of preset PLMNs, the preset PLMN registered before the last shutdown or the off-network as the target PLMN.

Here, the IVS temporarily saves the PLMN that was last shut down or registered (ie, accessed) before the off-network. If the IVS registered before the last shutdown or off-net is just a preset PLMN, the preset is selected. The PLMN acts as the target PLMN. In this case, selecting the PLMN that was accessed before the IVS can ensure that the PLMN and the IVS are compatible, and the PLMN is a preset PLMN, and the PSAP can be guaranteed to be deployed in the PLMN.

Second, the IVS selects the preset PLMN with the highest priority from the plurality of preset PLMNs as the target PLMN.

Here, the IVS may set a priority for each preset PLMN when the preset PLMN is stored in advance. When performing the method in the present application, the IVS selects the preset PLMN with the highest priority among the plurality of preset PLMNs as the target PLMN.

Third, the IVS selects the preset PLMN to which the IVS belongs from the plurality of preset PLMNs as the target PLMN.

Here, there is only one PLMN to which the IVS belongs, and may be stored in the IVS. For example, the PLMN to which the IVS belongs may be China Mobile's 46000 PLMN, or China Unicom's 46001 PLMN, or China Telecom's 46003 PLMN. The attribution of the home PLMN and the mobile phone are similar. The SIM card or the USIM card in the mobile phone stores the information of the home location, and the attribution is unique. For example, the attribution may be Shenzhen, Beijing, Shanghai, or the like.

In the present application, if the home PLMN of the IVS is exactly a preset PLMN, the PLMN is selected as the target PLMN. In this case, the home PLMN of the IVS is selected as the target PLMN, and the IVS does not roam when accessing the network, and the operation is simple. And the PLMN is a preset PLMN, and it can ensure that the PSAP is deployed in the PLMN.

Fourth, the IVS selects a user-specified preset PLMN as a target PLMN from a plurality of preset PLMNs.

Here, the user may also designate a certain PLMN, and the IVS directly selects the PLMN designated by the user from the plurality of preset PLMNs as the target PLMN.

It can be understood that, instead of being limited to the four selection strategies described above, the IVS may also select a target PLMN from the plurality of preset PLMNs according to other selection policies. For example, the IVS can be any of the plurality of preset PLMNs A preset PLMN is selected as the target PLMN, and a preset PLMN with the strongest signal or the best indicator among the plurality of preset PLMNs may be selected as the target PLMN, which is not limited in this application.

S202. Measure an indicator of the target PLMN.

S203. If the indicator of the target PLMN reaches a preset threshold, access the target PLMN, so that the IVS sends data to the PSAP in the target PLMN.

It should be noted that the related descriptions of the steps S102-S103 in the embodiment of FIG. 8 may be referred to in the steps S202-S203, and details are not described herein.

In the present application, if the indicator of the target PLMN does not reach the preset threshold, the IVS continues to select another preset PLMN as the new target PLMN among the plurality of preset PLMNs, and performs the same steps. S202-S203, until the target PLMN access conforming to the requirements of the present application is selected.

It should be noted that, when the IVS continues to select another preset PLMN as the new target PLMN among the multiple preset PLMNs, the foregoing second selection policy may be used, or a preset PLMN may be arbitrarily selected. A preset PLMN with the strongest signal or the best indicator may also be selected as the new target PLMN, which is not limited in this application.

Here, reference may be made also to FIG. 9, which illustrates a process in which the IVS transmits an MSD after implementing the method of selecting a PLMN of the present application. As shown in FIG. 9, after the method described in this application is implemented, the access PLMN and the destination PLMN are the same PLMN, and the MSD uses the same coding mode during transmission, thereby avoiding the coding conversion of the MSD during transmission, and ensuring transmission. The reliability of the MSD in the process. The implementation of the present application can ensure that the MSD is accurately transmitted to the PSAP, so that the PSAP can provide a corresponding service for the vehicle, and can reduce the loss caused by the accident or failure of the vehicle.

Referring to FIG. 11, FIG. 11 is a schematic flowchart of still another method for selecting a PLMN provided by the present application. In the method embodiment shown in FIG. 9, the preset PLMN in the IVS is in the above (3) case, that is, a scenario in which multiple operators have PSAP deployment rights. The method embodiment shown in FIG. 11 is exemplified by two operators having PSAP deployment rights. The method may include the following steps:

S301. The IVS selects a target PLMN from the plurality of preset PLMNs according to a priority level.

In the present application, the plurality of preset PLMNs include a preset PLMN belonging to the first operator and a preset PLMN belonging to the second operator, wherein the priority level of each preset PLMN belonging to the first operator Both are higher than each preset PLMN belonging to the second operator.

Specifically, the IVS first selects a target PLMN in a preset PLMN belonging to the first operator with a high priority. When the target PLMN is selected, the target PLMN may be selected by using the selection policy in the foregoing embodiment of FIG. 10 . For details, refer to the related description in the embodiment of FIG. 10 , and details are not described herein.

S302. Measure an indicator of the target PLMN.

S303. If the indicator of the target PLMN reaches a preset threshold, access the target PLMN, so that the IVS sends data to the PSAP in the target PLMN.

It should be noted that the related descriptions of the steps S102-S103 in the embodiment of FIG. 8 may be referred to in the steps S302-S303, and details are not described herein.

In the present application, if the indicator of the target PLMN does not reach the preset threshold, the IVS continues to select another preset PLMN as the new target PLMN in the preset PLMN belonging to the first operator. Steps S302-S303 are also performed until the target PLMN access conforming to the requirements of the present application is selected. If it belongs to the first If there is no target PLMN in the preset PLMN of the operator that meets the requirements of the present application, the preset PLMN is selected as the new target PLMN among the preset PLMNs belonging to the second operator, and steps S302-S303 are also performed until the selection is met. The target PLMN access required by this application.

Here, reference may be made to FIG. 9, which illustrates a process in which the IVS transmits an MSD after implementing the method of selecting a PLMN described in the present application. As shown in FIG. 9, after the method described in this application is implemented, the access PLMN and the destination PLMN are the same PLMN, and the MSD uses the same coding mode during transmission, thereby avoiding the coding conversion of the MSD during transmission, and ensuring transmission. The reliability of the MSD in the process. The implementation of the present application can ensure that the MSD is accurately transmitted to the PSAP, so that the PSAP can provide a corresponding service for the vehicle, and can reduce the loss caused by the accident or failure of the vehicle.

In some embodiments, for the method for selecting a PLMN in the foregoing method embodiment shown in FIG. 8, FIG. 10 or FIG. 11, if the indicator of the preset PLMN in the at least one preset PLMN stored in the IVS reaches a preset threshold, The method may further comprise the step of: the IVS accessing an optimal preset PLMN, wherein the optimal preset PLMN is a preset PLMN that is optimal in the at least one preset PLMN.

Specifically, in this case, all the preset PLMN indicators do not reach the preset threshold, and the preset threshold may be set too high, or may be the index of the preset PLMN. At this time, the IVS may select the preset PLMN access with the best indicator in the at least one preset PLMN. Although the preset PLMN indicator of the access does not reach the preset threshold, the PSAP is deployed in the accessed preset PLMN.

After the above steps are implemented, the access PLMN and the destination PLMN are the same PLMN, and the MSD uses the same coding mode during transmission, which avoids the coding conversion of the MSD during transmission, and can ensure the reliability of the MSD during transmission.

In other embodiments, for the method for selecting a PLMN in the foregoing method embodiment shown in FIG. 8, FIG. 10 or FIG. 11, if the indicator of the preset PLMN is not reached in the at least one preset PLMN stored in the IVS Setting a threshold, the method may further include the step of: the IVS access indicator optimal PLMN, wherein the indicator optimal PLMN is an indicator of the at least one preset PLMN and the at least one non-preset PLMN PLMN, the PSAP is not deployed in the at least one non-pre-populated PLMN.

Specifically, in this case, the IVS measures an indicator of the at least one non-preset PLMN, and from all the optional PLMNs, that is, from the at least one preset PLMN and the at least one non-preset The PLMN access with the best indicator is selected in the PLMN. Wherein, if the PLMN accessed by the IVS is a preset PLMN, the PSAP deployed in the access PLMN can ensure the reliability of the MSD transmission. If the PLMN accessed by the IVS is a non-preferred PLMN, the PMN is not deployed in the access PLMN, but the access PLMN is the best indicator, which can ensure the efficiency of the MSD transmission, and can also be transmitted through multiple transmissions. Guarantee the reliability of the MSD.

The above detailed description of the method of the present application, in order to facilitate the better implementation of the above solution of the present application, the present application also provides a corresponding device.

One implementation of the IVS referred to in this application is described below. The information of the preset PLMN is stored in the IVS, and the preset PLMN stored in the IVS may refer to the related description of the foregoing (1), (2), and (3) cases.

Referring to FIG. 12, FIG. 12 is a structural block diagram of an implementation manner of the IVS 100 provided by the present application. As shown in FIG. 12, the IVS 100 can include a baseband chip 110, a memory 115 (one or more computer readable storage media), a radio frequency (RF) module 116, and a peripheral system 117. These components can communicate over one or more communication buses 114.

The peripheral system 117 is mainly used to implement the interaction function between the IVS 100 and the user/external environment, and mainly includes the input and output devices of the IVS 100. In a specific implementation, the peripheral system 117 can include a touch screen controller 118, a camera controller 119, an audio controller 120, and a sensor management module 121. Each controller may be coupled to a respective peripheral device (such as touch screen 123, camera 124, audio circuit 125, and sensor 126). It should be noted that the peripheral system 117 may also include other I/O peripherals.

The baseband chip 110 can be integrated to include one or more processors 111, a clock module 112, and a power management module 113. The clock module 112 integrated in the baseband chip 110 is primarily used to generate the clocks required for data transfer and timing control for the processor 111. The power management module 113 integrated in the baseband chip 110 is mainly used to provide a stable, high-precision voltage for the processor 111, the radio frequency module 116, and the peripheral system.

A radio frequency (RF) module 116 is used to receive and transmit radio frequency signals, primarily integrating the receiver and transmitter of the IVS 100. A radio frequency (RF) module 116 communicates with the communication network and other communication devices via radio frequency signals. In a specific implementation, the radio frequency (RF) module 116 may include, but is not limited to: an antenna system, an RF transceiver, one or more amplifiers, a tuner, one or more oscillators, a digital signal processor, a CODEC chip, a SIM card, and Storage media, etc. In some embodiments, a radio frequency (RF) module 116 can be implemented on a separate chip. In this application, a radio frequency module can be used to communicate with an access PLMN to transmit an MSD.

Memory 115 is coupled to processor 111 for storing various software programs and/or sets of instructions. In particular implementations, memory 115 may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, or other non-volatile solid state storage devices. The memory 115 can store an operating system (hereinafter referred to as a system) such as an embedded operating system such as ANDROID, IOS, WINDOWS, or LINUX. The memory 115 can also store a network communication program that can be used to communicate with one or more additional devices, one or more terminal devices, one or more network devices. The memory 115 can also store a user interface program, which can realistically display the content of the application through a graphical operation interface, and receive user control operations on the application through input controls such as menus, dialog boxes, and keys. .

In the present application, the memory 115 can also store related information of the preset PLMN. The preset PLMN stored in the memory 115 may refer to the related description of the preset PLMN in the foregoing (1), (2), and (3) cases.

It should be understood that the IVS 100 is only one example provided by the present application, and that the IVS 100 may have more or fewer components than those shown, may combine two or more components, or may have different configurations of components.

FIG. 13 shows a functional block diagram of an IVS provided by the present application. The functional blocks of the IVS may implement the present application by hardware, software, or a combination of hardware and software. Those skilled in the art will appreciate that the functional blocks described in FIG. 13 may be combined or separated into several sub-blocks to implement the present application. Accordingly, the above description in this application may support any possible combination or separation or further definition of the functional modules described below.

As shown in FIG. 13, the IVS 110 may include a processing unit 111, a storage unit 112, and an access unit 113. among them:

The storage unit 112 is configured to store at least one preset PLMN. The PSAP is deployed in the at least one preset PLMN. The at least one preset PLMN stored in the storage unit 112 may refer to the above (1) (two). ) (3) a relevant description in the case;

The processing unit 111 is configured to select a target PLMN from the at least one preset PLMN;

The processing unit 111 is further configured to measure an indicator of the target PLMN;

The processing unit 111 is further configured to: when the indicator of the target PLMN reaches a preset threshold, instruct the access unit to access the target PLMN;

The access unit 113 is configured to access the target PLMN.

In a specific implementation, the access unit 113 may be the radio frequency module in FIG. 10, and may be used to communicate with the access PLMN to transmit the MSD.

In some possible implementations, the processing unit 111 is specifically configured to select, from the at least one preset PLMN, the preset PLMN registered before the last shutdown or the off-network as the target PLMN; or select the priority from the at least one preset PLMN. The highest preset PLMN is used as the target PLMN; or the preset PLMN to which the IVS belongs is selected as the target PLMN from at least one preset PLMN; or the user-specified preset PLMN is selected as the target PLMN from the at least one preset PLMN .

In some possible implementations, the at least one preset PLMN includes a preset PLMN belonging to the first operator and a preset PLMN belonging to the second operator, where the preset PLMN belonging to the first operator The priority level is higher than the priority level of the preset PLMN belonging to the second operator; the processing unit 111 is specifically configured to select the target PLMN from the at least one preset PLMN according to the priority level.

In some possible implementation manners, if the indicator of the preset PLMN in the at least one preset PLMN reaches a preset threshold, the processing unit 111 may be further configured to instruct the access unit 113 to access the optimal preset PLMN, where The optimal preset PLMN is the preset PLMN whose index is the best among the at least one preset PLMN; or the processing unit 111 is further configured to instruct the access unit 113 to access the index optimal PLMN, wherein the indicator is optimal The PLMN is the PLMN with the best indicator among the at least one preset PLMN and the at least one non-preset PLMN, and the PSAP is not deployed in the at least one non-preset PLMN. The access unit 113 is specifically configured to access the optimal preset PLMN or access the indicator optimal PLMN.

In an alternative embodiment, the data is an MSD.

For a specific implementation manner of the function block included in the IVS 110 of FIG. 13, reference may be made to the foregoing embodiment, and details are not described herein.

The implementation of the present application can ensure that the access PLMN and the destination PLMN are the same PLMN. The MSD uses the same coding mode during transmission, which avoids the coding conversion of the MSD during transmission and ensures the reliability of the MSD during transmission. The implementation of the present application can ensure that the MSD is accurately transmitted to the PSAP, so that the PSAP can provide a corresponding service for the vehicle, and can reduce the loss caused by the accident or failure of the vehicle.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with the present application are generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center By wire (eg coaxial cable, fiber, digital User line) or wireless (eg infrared, wireless, microwave, etc.) to another website site, computer, server or data center. The computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media. The usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state hard disk).

Claims (17)

1. A method for selecting a PLMN, comprising:

   When the IVS initializes or triggers the PLMN reselection, the IVS selects the target PLMN from the at least one preset PLMN, wherein the PSAP is deployed in the at least one preset PLMN;

   Measuring an indicator of the target PLMN;

   And if the indicator of the target PLMN reaches a preset threshold, accessing the target PLMN, so that the IVS sends data to a PSAP in the target PLMN.
2. The method of claim 1 wherein the selecting, by the IVS, the target PLMN from the at least one pre-PLMN comprises:

   The IVS selects, from the at least one preset PLMN, the preset PLMN that was last turned off or registered before the off-network as the target PLMN; or

   The IVS selects the preset PLMN with the highest priority from the at least one preset PLMN as the target PLMN; or

   The IVS selects the preset PLMN to which the IVS belongs from the at least one preset PLMN as the target PLMN; or

   The IVS selects a user-specified preset PLMN from the at least one preset PLMN as the target PLMN.
3. The method according to claim 1, wherein the at least one preset PLMN includes a preset PLMN belonging to the first operator and a preset PLMN belonging to the second operator, wherein the first operation belongs to the first operation. The priority level of the preset PLMN of the quotient is higher than the priority level of the preset PLMN belonging to the second operator;

   The selecting, by the IVS, the target PLMN from the at least one preset PLMN comprises: the IVS selecting a target PLMN from the at least one preset PLMN according to a priority level.
4. The method according to any one of claims 1 to 3, wherein the method further comprises:

   And if the indicator of the preset PLMN in the at least one preset PLMN reaches a preset threshold, the IVS accesses the optimal preset PLMN, wherein the optimal preset PLMN is in the at least one preset PLMN. The preferred PLMN with the best indicator; or,

   And if the indicator of the preset PLMN in the at least one preset PLMN reaches a preset threshold, the IVS access indicator is an optimal PLMN, wherein the indicator optimal PLMN is in the at least one preset PLMN and at least A PLMN with the best indicator in the non-pre-populated PLMN, and no PSAP is deployed in the at least one non-pre-populated PLMN.
5. A method according to any one of claims 1 to 4, wherein the data is an MSD.
6. An IVS, comprising: a processor, a memory, and a transceiver, wherein:

   The memory is configured to store at least one preset PLMN, wherein a PSAP is deployed in the at least one preset PLMN;

   The processor is configured to select a target PLMN from the at least one preset PLMN when the IVS initializes or triggers a PLMN reselection;

   The processor is further configured to measure an indicator of the target PLMN;

   The transceiver is configured to access the target PLMN to send data to a PSAP in the target PLMN if an indicator of the target PLMN reaches a preset threshold.
7. The IVS according to claim 6, wherein the processor is specifically configured to select, from the at least one preset PLMN, the preset PLMN registered before the last shutdown or the off-network as the target PLMN; or

   Selecting the preset PLMN with the highest priority from the at least one preset PLMN as the target PLMN; or

   Selecting the preset PLMN to which the IVS belongs from the at least one preset PLMN as the target PLMN; or

   A user-specified preset PLMN is selected from the at least one preset PLMN as the target PLMN.
8. The IVS according to claim 6, wherein the at least one preset PLMN includes a preset PLMN belonging to the first operator and a preset PLMN belonging to the second operator, wherein the first operation belongs to the first operation. The priority level of the preset PLMN of the quotient is higher than the priority level of the preset PLMN belonging to the second operator;

   The processor is specifically configured to select a target PLMN from the at least one preset PLMN according to a priority level.
9. The IVS according to any one of claims 6 to 8, wherein the processor is further configured to: if the indicator of the preset PLMN in the at least one preset PLMN reaches a preset threshold, indicating the sending and receiving Accessing the optimal preset PLMN, wherein the optimal preset PLMN is a preset PLMN that is optimal in the at least one preset PLMN; the transceiver is further configured to access the optimal preset PLMN, or,

   The processor is further configured to: if the indicator that the preset PLMN is not in the at least one preset PLMN reaches a preset threshold, instruct the transceiver to access an indicator optimal PLMN, where the indicator optimal PLMN is The PLMN in the at least one preset PLMN and the at least one non-preset PLMN, wherein the PSAP is not deployed in the at least one non-preferred PLMN; the transceiver is further configured to access the indicator optimal PLMN.
10. The IVS of any of claims 6-9, wherein the data is an MSD.
11. An IVS, comprising: a processing unit, a storage unit, and an access unit, wherein:

    The storage unit is configured to store at least one preset PLMN, wherein a PSAP is deployed in the at least one preset PLMN;

    The processing unit is configured to select a target PLMN from the at least one preset PLMN when the IVS initializes or triggers a PLMN reselection;

    The processing unit is further configured to measure an indicator of the target PLMN;

    The access unit is configured to access the target PLMN to send data to a PSAP in the target PLMN if an indicator of the target PLMN reaches a preset threshold.
12. The IVS according to claim 11, wherein the processing unit is specifically configured to select, from the at least one preset PLMN, the preset PLMN registered before the last shutdown or the off-network as the target PLMN; or

    Selecting the preset PLMN with the highest priority from the at least one preset PLMN as the target PLMN; or

    Selecting the preset PLMN to which the IVS belongs from the at least one preset PLMN as the target PLMN; or

    A user-specified preset PLMN is selected as the target PLMN from at least one preset PLMN.
13. The IVS according to claim 11, wherein the at least one preset PLMN includes a preset PLMN belonging to the first operator and a preset PLMN belonging to the second operator, wherein the first operation belongs to the first operation. The priority level of the preset PLMN of the quotient is higher than the priority level of the preset PLMN belonging to the second operator;

    The processing unit is specifically configured to select a target PLMN from the at least one preset PLMN according to a priority level.
14. The IVS according to any one of claims 11 to 13, wherein the processing unit is further configured to: if the indicator that the preset PLMN is not in the at least one preset PLMN reaches a preset threshold, indicating the connection The inbound unit accesses the optimal preset PLMN, wherein the optimal preset PLMN is a preset PLMN that is optimal in the at least one preset PLMN; the access unit is further configured to access the optimal Preset PLMN, or,

    The processing unit is further configured to: if the indicator of the preset PLMN in the at least one preset PLMN reaches a preset preset, instruct the access unit to access an indicator optimal PLMN, where the indicator optimal PLMN a PSAP is not deployed in the at least one non-pre-populated PLMN, and the access unit is further configured to access the indicator optimally. PLMN.
15. The IVS of any of claims 11-14, wherein the data is an MSD.
16. A computer readable storage medium comprising instructions which, when executed on a computer, cause the computer to perform the method of claims 1-5.
17. A computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of claims 1-5.

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