CN106231570B - Method and device for automatic data retransmission of unstructured supplementary data service - Google Patents

Abstract

The invention discloses a method and device for automatic data retransmission of unstructured supplementary data service. The method comprises the following steps: sending the data of the unstructured supplementary data service USSD to a network operator server; acquiring the data returned by the network operator server USSD return message; determine whether the USSD return message is failure information that data transmission fails due to network reasons; if the USSD return message is failure information that data transmission fails due to network reasons, cancel the default and report the USSD return message For the mechanism of the application layer of the system, the USSD data is re-sent to the server of the network operator, which can reduce the manual operation of the user and improve the user experience. In addition, the processing operations of the present invention can be directly processed at the RIL layer of the system, which greatly speeds up the processing speed.

Description

Method and device for automatic data retransmission of unstructured supplementary data service

technical field

The present invention relates to the technical field of mobile communication, and more particularly, to a method and device for automatic data retransmission of unstructured supplementary data services.

Background technique

Unstructured Supplementary Service Data USSD (Unstructured Supplementary Service Data) is a new real-time online interactive session data service based on the Global System for Mobile Communications GSM network. Data is a new service launched on the basis of GSM short message system technology.

The system structure of USSD service and SMS service is the same, and both use the network signaling channel to transmit information. However, sometimes the network may be busy or unknown errors may cause the USSD data to fail to send. At this time, the mobile terminal will receive the network operator. The return message of the failure to send the USSD data returned by the server will be reported to the application layer of the system by default, so as to be displayed on the screen to remind the user that the data sending fails. At this time, the user can only re-send the data manually once, which will be inconvenient. User operation, reducing the user experience.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned defects in the prior art, and to provide a method and device for automatic data retransmission of an unstructured supplementary data service that can reduce user manual operations and improve user experience.

In order to achieve the above purpose, a first aspect of the present invention provides a method for automatic data retransmission of an unstructured supplementary data service, comprising the following steps:

Send the data of the unstructured supplementary data service USSD to the server of the network operator;

Obtain the USSD return message returned by the network operator server;

Determine whether the USSD return message is failure information that data transmission fails due to network reasons;

If the USSD return message is failure information that data transmission fails due to network reasons, the default mechanism of reporting the USSD return message to the application layer of the system is canceled, and the USSD data is re-sent to the network operator server.

Preferably, the steps of obtaining the USSD return message returned by the network operator server, judging whether the USSD return message is failure information that data transmission fails due to network reasons, and re-sending the USSD data to the network operator server The steps are all processed at the RIL layer of the radio interface of the system.

Preferably, the step of obtaining the USSD return message returned by the network operator server specifically includes:

Make the RIL.java of the RIL layer monitor whether the Modem layer of the system receives the USSD return message returned by the network operator server through the message communication mechanism of the Modem;

After receiving the USSD return message returned by the network operator server, the Modem layer of the system obtains the USSD return message at the RIL layer.

Preferably, the step of judging whether the USSD return message is failure information that data transmission fails due to network reasons specifically includes:

At the RIL layer, obtain all the information contained in the USSD return message by viewing the unorganized additional service data instruction;

Parse all the information contained in the USSD return message, thereby judging whether it contains an error code that fails to send data due to network reasons;

If there is an error code that data transmission fails due to network reasons, it is determined that the USSD return message is failure information that data transmission fails due to network reasons.

Preferably, the method also includes the following steps:

When the number of failures of resending USSD data to the network operator server reaches a preset threshold, the resending operation is stopped, and the USSD return message is reported to the application layer of the system to notify the user that the data sending failed.

A second aspect of the present invention provides a data automatic retransmission device for an unstructured supplementary data service, comprising:

The data sending module is used to send the data of the unstructured supplementary data service USSD to the server of the network operator;

The return information acquisition module is used to acquire the USSD return message returned by the network operator server;

The return message judgment module is used to judge whether the USSD return message is failure information that data transmission fails due to network reasons;

The retransmission processing module is used to cancel the default mechanism of reporting the USSD return message to the application layer of the system if the USSD return message is failure information that data transmission fails due to network reasons, and control the data transmission module to re-transmit the data to the network. Carrier server sends USSD data.

Preferably, the processing operations of the returned information acquisition module, the returned message judgment module and the retransmission processing module are all processed at the radio interface RIL layer of the system.

Preferably, the returned information acquisition module specifically includes:

The monitoring unit is used to make the RIL.java of the RIL layer monitor whether the Modem layer of the system receives the USSD return message returned by the network operator server through the message communication mechanism of the Modem;

The first obtaining unit is configured to obtain the USSD return message at the RIL layer after the Modem layer of the system receives the USSD return message returned by the network operator server.

Preferably, the returned message judgment module specifically includes:

The second obtaining unit is used to obtain all the information contained in the USSD return message by viewing the unorganized additional service data instruction at the RIL layer;

The judgment unit is used to parse all the information contained in the USSD return message, thereby judging whether it contains an error code that fails to send data due to network reasons; and if it contains an error code that fails to send data due to network reasons, Then, it is determined that the USSD return message is failure information that data transmission fails due to network reasons.

Preferably, the retransmission processing module is further configured to control the data transmission module to stop the retransmission operation when the number of failures of the data transmission module to retransmit the USSD data to the network operator server reaches a preset threshold The USSD returns a message and reports it to the application layer of the system to notify the user that the data transmission fails.

Compared with the prior art, the beneficial effects of the present invention are:

The present invention sets up an automatic data retransmission mechanism of the unstructured supplementary data service USSD. When the USSD return message returned by the network operator server is obtained, it will be judged whether the USSD return message is the failure information that the data transmission fails due to network reasons. , if yes, cancel the default mechanism of reporting the USSD return message to the application layer of the system, and automatically re-send the USSD data to the network operator server, which can reduce the manual operation of the user and improve the user experience.

Further, the processing operations of the present invention can be directly performed at the RIL layer of the system, which can quickly obtain the message that the USSD data fails to send and facilitate the processing of related operations, greatly speeding up the processing speed.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are For some embodiments of the present invention, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a flow chart of a method for automatic data retransmission of an unstructured supplementary data service provided by the present invention;

Fig. 2 is the flow chart of the automatic data resending method of another kind of unstructured supplementary data service provided by the present invention;

Fig. 3 is the information structure diagram of a kind of USSD return message provided by the present invention,

4 is a structural block diagram of a data automatic retransmission device for unstructured supplementary data services provided by the present invention;

FIG. 5 is a structural block diagram of another apparatus for automatic data retransmission of unstructured supplementary data service provided by the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The method and apparatus for automatic data retransmission of unstructured supplementary data services provided by the embodiments of the present invention can be applied to mobile terminals, where the mobile terminals include smart phones, tablet computers, or other electronic devices that support unstructured supplementary data services.

Based on the Android system, the system architecture of the mobile terminal can be divided into four layers: the bottom-up Modem layer, the RIL (radio interface) layer, the framework layer and the application layer.

FIG. 1 is a flowchart of a method for automatic data retransmission of an unstructured supplementary data service in an embodiment of the present invention. As shown in the figure, the method of this embodiment includes the following steps:

Step S101, sending the data of the unstructured supplementary data service USSD to the network operator server;

Initially, the mobile terminal can send the data of the unstructured supplementary data service USSD to the server of the network operator at the application layer of the system, and then transmit the information with the network side.

Step S102, obtaining the USSD return message returned by the network operator server;

After the mobile terminal sends the data of the unstructured supplementary data service USSD to the network operator server, the network operator server will return the USSD return message to the mobile terminal, wherein the Modem layer of the system will receive the USSD return message first. However, the processing of the Modem layer is more complicated. Usually, the message is not processed, but reported directly. Therefore, the RIL layer, the framework layer and the application layer can theoretically obtain the received USSD return message from the network operator server, but because the RIL layer is a For the layer that communicates directly with the Modem layer, considering the time required for reporting, processing directly at the RIL layer is the most convenient and fastest. Therefore, the received USSD return message fed back by the server of the network operator may preferably be acquired at the RIL layer and processed in the following steps.

Step S103, judging whether the USSD return message is failure information that data transmission fails due to network reasons;

The USSD return message returned by the network operator server may include a data sending success message and a data sending failure message. When the mobile terminal transmits the message to the server of the network operator, sometimes the network may experience a busy network or an unknown error, which may cause the USSD data to fail to be sent. other identification information) to determine whether data transmission fails due to network reasons, and if data transmission fails due to network reasons, step S104 is performed.

Step S104, cancel the default mechanism of reporting the USSD return message to the application layer of the system, and re-send the USSD data to the network operator server.

In the prior art, by default, if the USSD return message is failure information that data transmission fails due to network reasons, the Modem layer of the system will report the USSD return message to the application layer of the system to notify the user. In this implementation In step S104 of the example, it may be preferable to directly re-send the USSD data to the network operator server at the RIL layer, and it is not necessary to report to the application layer. Of course, it can also be processed at the framework layer of the system.

The method of the embodiment of the present invention sets the data automatic retransmission mechanism of the unstructured supplementary data service USSD, which can reduce the manual operation of the user and improve the user experience.

FIG. 2 is a flowchart of another method for automatic data retransmission of an unstructured supplementary data service in an embodiment of the present invention. The method of this embodiment is designed based on the MTK platform. As shown in the figure, the method of this embodiment includes the following steps:

Step S201, sending the data of the unstructured supplementary data service USSD to the network operator server;

Initially, the mobile terminal can send the data of the unstructured supplementary data service USSD to the server of the network operator at the application layer of the system, and then transmit the information with the network side.

Step S202, make the RIL.java of the RIL layer monitor whether the Modem layer of the system receives the USSD return message returned by the network operator server through the message communication mechanism of the Modem;

Step S203, when the Modem layer of the system receives the USSD return message returned by the network operator server, then obtains the USSD return message at the RIL layer;

Among them, the mobile terminal can monitor the RIL_UNSOL_ON_USSD message in the RIL.java file of the system RIL layer. When the Modem layer receives the USSD return message, the Modem layer can send the USSD return message through an unorganized additional service data command (ie AT+CUSD). It is sent to RILD (a module in the RIL layer), and the RILD is sent to RIL.java through the socket (socket), so that the USSD return message can be obtained at the RIL layer.

Step S204, at the RIL layer, obtain all the information contained in the USSD return message by viewing unorganized additional service data instructions;

The AT command is the way for the Modem layer of the MTK platform to communicate with the RIL layer, and the RIL layer can obtain all the data information contained in the USSD return message by viewing the unorganized additional service data command (ie AT+CUSD). It is the method by which MTK obtains the information contained in the USSD return message. FIG. 3 is the information structure of the obtained USSD return message.

Step S205, analyzing all the information contained in the USSD return message, thereby judging whether it contains an error code that fails to send data due to network reasons;

Wherein, step S205 may be performed in the RILD of the RIL layer, or may be performed in RIL.java, and in this embodiment, the processing is preferably performed in RIL.java.

As shown in FIG. 3 , the USSD return message includes code information such as 0, 2, and 4, and the code information represents whether the data is sent successfully or has other meanings.

Exemplarily, the definition of the code information included in the USSD return message may be as follows:

static final int USSD_MODE_NOTIFY = 0;

static final int USSD_MODE_REQUEST = 1;

static final int USSD_MODE_NW_RELEASE=2;

static final int USSD_MODE_LOCAL_CLIENT=3;

static final int USSD_MODE_NOT_SUPPORTED = 4;

static final int USSD_MODE_NW_TIMEOUT=5.

According to the above definition, 4 and 5 are both error codes represented by the failure of data transmission due to network reasons. If there is an error code of data transmission failure due to network reasons, it is determined that the USSD return message is due to network reasons. If the failure information that fails to be sent is sent, step S206 is executed.

Step S206, cancel the default mechanism of reporting the USSD return message to the application layer of the system, and send the USSD data to the network operator server again;

During specific operations, if the USSD return message is failure information that data transmission fails due to network reasons, it can be directly processed at the RIL layer, and the USSD data is re-sent to the network operator server without reporting to the application layer.

Step S207: When the number of failures of resending the USSD data to the network operator server reaches a preset threshold, the resending operation is stopped, and the USSD return message is reported to the application layer of the system to notify the user of the failure to send the data.

In specific implementation, the threshold can be preferably set to 3 times, and of course can also be set to other times, but the number of failures is too many, and the continuous retransmission will increase the system burden. Therefore, in this embodiment, when the number of failures in resending the USSD data reaches three times, the resending operation can be stopped and the user can be notified of the failure to send the data.

The processing steps of the method in the embodiment of the present invention can be directly performed at the RIL layer of the system, which can obtain the message of the failure to send USSD data more quickly and facilitate the processing of related operations, which greatly speeds up the processing speed.

It should be noted that the automatic data retransmission method of the unstructured supplementary data service of the present invention can also be designed on the basis of the platform provided by the Qualcomm platform or other platform providers, because the existing technology platforms are already well Yes, the USSD return message can be obtained only by calling the interface through the relevant commands set by each platform, so it is not limited to the "AT+CUSD" command provided by the MTK platform to obtain the USSD return message.

4 is a structural block diagram of an apparatus for automatic data retransmission of an unstructured supplementary data service in an embodiment of the present invention. As shown in the figure, the apparatus in this embodiment includes a data sending module 1, a return information acquisition module 2, and a return The message judgment module 3 and the retransmission processing module 4, the principles of the above modules will be described in detail below.

The data sending module 1 is used for sending the data of the unstructured supplementary data service USSD to the server of the network operator;

Specifically, the data sending module 1 may send the data of the unstructured supplementary data service USSD to the network operator server at the application layer of the system during initial sending, and then transfer information with the network side.

Return information acquisition module 2, for acquiring the USSD return message returned by the network operator server;

After the mobile terminal sends the data of the unstructured supplementary data service USSD to the network operator server, the network operator server will return the USSD return message to the mobile terminal, wherein the Modem layer of the system will receive the USSD return message first. However, the processing of the Modem layer is more complicated. Usually, the message is not processed, but reported directly. Therefore, the RIL layer, the framework layer and the application layer can theoretically obtain the received USSD return message from the network operator server, but because the RIL layer is a For the layer that communicates directly with the Modem layer, considering the time required for reporting, processing directly at the RIL layer is the most convenient and fastest. Therefore, the processing operations of the return information acquisition module 2, the return message judgment module 3 and the retransmission processing module 4 can preferably be processed at the RIL layer of the system.

Return message judgment module 3, for judging whether the USSD return message is failure information that data transmission fails due to network reasons;

The USSD return message returned by the network operator server may include a data sending success message and a data sending failure message. When the mobile terminal transmits a message to the network operator server, sometimes the network may be busy or an unknown error occurs, which may cause the USSD data to fail to be sent. : error code or other identification information) to determine whether data transmission fails due to network reasons, and if data transmission fails due to network reasons, the retransmission processing module 4 can be activated.

The retransmission processing module 4 is used to cancel the default mechanism of reporting the USSD return message to the application layer of the system if the USSD return message is the failure information that data transmission fails due to network reasons, and control the data transmission module to re-transmit the data to the system. The network operator server sends the USSD data.

In the prior art, by default, if the USSD return message is failure information that data transmission fails due to network reasons, the Modem layer of the system will report the USSD return message to the application layer of the system to notify the user. In this implementation In an example, the retransmission processing module 4 can control the data transmission module to directly re-send the USSD data to the network operator server at the RIL layer, and does not need to report to the application layer. Of course, it can also be processed at the framework layer of the system.

The device in the embodiment of the present invention is provided with an automatic data retransmission mechanism of the unstructured supplementary data service USSD, which can reduce the manual operation of the user and improve the user experience.

FIG. 5 is a structural block diagram of another apparatus for automatic data retransmission of unstructured supplementary data service in an embodiment of the present invention. As shown in the figure, on the basis of the apparatus of the above-mentioned embodiment, the apparatus of this embodiment also includes Data transmission module 1, return information acquisition module 2, return message judgment module 3 and retransmission processing module 4, processing operations of the data transmission module 1, return information acquisition module 2, return message judgment module 3 and retransmission processing module 4 All are directly processed at the RIL layer of the system.

In addition, further, the described return information acquisition module 2 specifically includes:

The monitoring unit 21 is used to make the RIL.java of the RIL layer monitor whether the Modem layer of the system receives the USSD return message returned by the network operator server through the message communication mechanism of the Modem;

The first obtaining unit 22 is configured to obtain the USSD return message at the RIL layer after the Modem layer of the system receives the USSD return message returned by the network operator server.

The monitoring unit 21 can monitor the RIL_UNSOL_ON_USSD message in the RIL.java file of the system RIL layer. When the Modem layer receives the USSD return message, the Modem layer can send the USSD return message through an unorganized additional service data instruction (ie AT+CUSD). To RILD (a module in the RIL layer), the RILD is then sent to RIL.java through a socket (socket), so that the first obtaining unit 22 can obtain the USSD return message at the RIL layer.

Optionally, in this embodiment, the returned message judgment module 3 specifically includes:

The second obtaining unit 31 is used to obtain all the information contained in the USSD return message by viewing the unorganized additional service data instruction at the RIL layer;

The AT command is the way for the Modem layer of the MTK platform to communicate with the RIL layer, and the RIL layer can obtain all the data information contained in the USSD return message by viewing the unorganized additional service data command (ie AT+CUSD). It is the method by which MTK obtains the information contained in the USSD return message. FIG. 3 is the information structure of the obtained USSD return message.

The judgment unit 32 is used to parse all the information contained in the USSD return message, thereby judging whether it contains an error code that fails to send data due to network reasons; and if it contains an error code that fails to send data due to network reasons , then it is determined that the USSD return message is failure information that data transmission fails due to network reasons.

Further, the processing operation of the judging unit 32 may be specifically performed in RILD of the RIL layer, or may be performed in RIL.java, and in this embodiment, it is preferably performed in RIL.java.

As shown in FIG. 3 , the USSD return message includes code information such as 0, 2, and 4, and the code information represents whether the data is sent successfully or has other meanings.

Exemplarily, the definition of the code information included in the USSD return message may be as follows:

static final int USSD_MODE_NOTIFY = 0;

static final int USSD_MODE_REQUEST = 1;

static final int USSD_MODE_NW_RELEASE=2;

static final int USSD_MODE_LOCAL_CLIENT=3;

static final int USSD_MODE_NOT_SUPPORTED = 4;

static final int USSD_MODE_NW_TIMEOUT=5.

According to the above definition, "4" and "5" are both error codes representing the failure of data transmission due to network reasons. If there is an error code for data transmission failure due to network reasons, it is determined that the USSD return message is because The failure message that the data transmission fails due to network reasons.

If the judging unit 32 judges that the USSD return message is failure information that data transmission fails due to network reasons, the retransmission processing module 4 can directly process it at the RIL layer, and the control data transmission module 1 directly re-transmits the data to the network operator at the RIL layer. The server sends USSD data without reporting it to the application layer.

As a preferred embodiment, the retransmission processing module 4 can also be used to control the data transmission module to stop the retransmission operation when the number of failures of the data transmission module to retransmit the USSD data to the network operator server reaches a preset threshold, The USSD return message is reported to the application layer of the system to notify the user that the data transmission fails.

In specific implementation, the threshold can be preferably set to 3 times, and of course can also be set to other times, but the number of failures is too many, and the continuous retransmission will increase the system burden. Therefore, in this embodiment, when the number of failures of resending data reaches three times, the resending operation can be stopped and the user can be notified of the failure of data sending.

The processing steps of the apparatus according to the embodiment of the present invention can be directly performed at the RIL layer of the system, which can quickly acquire the message that the USSD data fails to send and facilitate the processing of related operations, which greatly speeds up the processing.

It should be noted that the apparatus for automatic data retransmission of the unstructured supplementary data service provided by the above embodiments is only illustrated by the division of the above functional modules. In practical applications, the above functions may be allocated by different The function module is completed, that is, the internal structure of the system is divided into different function modules to complete all or part of the functions described above.

Those of ordinary skill in the art can understand that all or part of the steps in the methods of the above embodiments can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium. Storage media, such as ROM/RAM, magnetic disks, optical disks, etc.

The above-mentioned embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, The simplification should be equivalent replacement manners, which are all included in the protection scope of the present invention.

Claims (4)

1. a kind of automatic repeating method of the data of unstructured supplementary data traffic, which is characterized in that this method includes following step It is rapid:

The data of unstructured supplementary data traffic USSD are sent to network operator server in application layer；In wireless interface RIL layers obtain the USSD that network operator server returns and return to message；Specifically: it is supervised in RIL layers of RIL.java file RIL_UNSOL_ON_USSD message is surveyed, the USSD that network operator server return is received when Modem layers returns to message, then USSD return message is sent to RILD by amorphous additional service data instruction, the RILD is sent out by socket RIL.java is given, returns to message to obtain the USSD at RIL layers；

At RIL layers of wireless interface, the error code information for being included in message is returned to according to the USSD and judges that the USSD is returned Whether message is because network cause causes data to send the failure information to fail；Specifically: at RIL layers by checking inorganization The mode of addition service data instruction return to all information for being included in message to obtain the USSD；It is solved in RIL.java It analyses the USSD and returns to all information for being included in message, to judge whether it includes because network cause causes data to be sent out Send the error code of failure；If including to determine that the USSD is returned because network cause causes data to send the error code of failure Message is because network cause causes data to send the failure information to fail；The network cause causes data to send Network busy, which causes data to send failure or network unknown error, causes data to send failure；

If the USSD return message be because of the failure information that network cause causes data to send failure, cancel default general USSD returns to information reporting to the mechanism of systematic difference layer, and at RIL layers of wireless interface again to network operator server Send USSD data.

2. the automatic repeating method of the data of unstructured supplementary data traffic according to claim 1, which is characterized in that should Method is further comprising the steps of:

When reaching preset threshold value to the frequency of failure that network operator server sends USSD data again, then stop again Operation is sent, and gives USSD return information reporting to systematic difference layer, to notify user data to send failure.

3. a kind of automatic retransmission apparatus of the data of unstructured supplementary data traffic, which is characterized in that the device includes:

Data transmission blocks, the data for sending unstructured supplementary data traffic USSD in application layer take to network operator Business device；

Return information obtains module, disappears for obtaining the USSD return that network operator server returns at RIL layers of wireless interface Breath；The return information obtains module and specifically includes: monitoring unit, for monitoring RIL_ in RIL layers of RIL.java file UNSOL_ON_USSD message；First acquisition unit, for receiving the USSD of network operator server return when Modem layers Message is returned, then USSD return message is sent to by RILD, the RILD by amorphous additional service data instruction It is sent to RIL.java by socket, returns to message to obtain the USSD at RIL layers；

Message judgment module is returned to, for returning to the error code for being included in message according to the USSD at RIL layers of wireless interface Information judges that the USSD returns to whether message is because of the failure information that network cause causes data to send failure；The return Message judgment module specifically includes: second acquisition unit, at RIL layers by checking that amorphous additional service data instructs Mode return to all information for being included in message to obtain the USSD；Judging unit, for parsing institute in RIL.java It states USSD and returns to all information for being included in message, to judge whether it includes to lose because network cause causes data to send The error code lost；If including to determine that the USSD returns to message because network cause causes data to send the error code of failure For because network cause causes data to send the failure information to fail；It unsuccessfully includes network that the network cause, which causes data to send, It is busy to cause data transmission failure or network unknown error that data is caused to send failure；

Retransmission process module, if returning to message for the USSD is because of the failure letter that network cause causes data to send failure Breath, then that cancels default returns to USSD information reporting to the mechanism of systematic difference layer, and controls data transmission blocks in nothing RIL layers of line interface sends USSD data to network operator server again.

4. the automatic retransmission apparatus of the data of unstructured supplementary data traffic according to claim 3, which is characterized in that

The retransmission process module is also used to send USSD data to network operator server again when data transmission blocks When the frequency of failure reaches preset threshold value, then controls data transmission blocks and stop retransmitting operation, and the USSD is returned Information reporting gives systematic difference layer, to notify user data to send failure.