CN1324914C - Short message transmitting method for PCS short message system - Google Patents

Abstract

The present invention relates to a short message transmitting method of a PCS short message system. After receiving a short message transmitted by a short message entity, a short message center transmits the short message to a specified user. The present invention is characterized in that whether a short message is an ultralong short message or not is judged before transmission, if false, then the short message is directly transmitted; if true, then the whole ultralong short message is stored in a database, a segment is split from the beginning to be transmitted; whether the rest message is an ultralong short message or not is judged, if false, then the message is directly transmitted; if true, then another segment is split to be transmitted, and the operation is carried out until the message is completely transmitted; all segments can be transmitted one by one after the message is split. After each message segment is completely transmitted, post-treatment, such as charging, etc., is carried out. The treatment efficiency of a short message center is improved, and the reliability and the stability of a system are also guaranteed; particularly, the splitting method has no extra requirements to a network terminal and a cell phone terminal; the correct splitting of long messages and short messages can be completely guaranteed by the short message center.

Description

The Method of Sending Short Message in PCS Short Message System

technical field

The invention relates to the field of short messages in mobile communication, in particular to the sending of ultra-long short messages by a PCS short message system.

Background technique

With the widespread application of the PCS, the short message of the PCS is also used more and more widely. The composition of the short message system of PCS is shown in Figure 1. The short message system generally consists of two parts: a short message center and an external short message entity (ESME). The short message center is divided into a business processing center module, an operation and maintenance module (OMM), It consists of a billing module (BM) and a proxy module (SMPP), responsible for the storage and forwarding of short messages. The external short message entity ESME accesses the SMS center through the SMPP protocol through the SMPP Agent to provide various extended services.

With the expansion and diversification of services, operators will provide various services for users to choose and use, and these services need to be connected to the PCS SMS center through the external SMS entity ESME, and provided to users in the form of SMS. The SMS entity and the SMS center communicate through the SMPP protocol, and the SMS center stores and forwards the messages submitted by these external message entities, and sends these messages to end users. Due to the limitations of the air interface of the current PCS network, the longest content of a short message can only be 116 bytes, that is, a maximum of 58 Chinese characters or 116 English characters. In actual applications, the messages sent by these external message entities often exceed This limit can reach 254 bytes at most. The short message center cannot simply send such super long messages, but needs to unpack the message before sending it. Otherwise, the message received by the end user will be incomplete. For the splitting of long messages, there are several difficulties: first, the user terminal of the split messages can be displayed correctly without garbled characters; second, the split messages should be received by the user in sequence; After the message is split, it can only be charged according to the tariff of an ordinary SMS, and the bill can only be charged after the user has successfully received all the messages. Due to these three conditions, it is difficult to realize the sending of long messages.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for sending super long messages in a new PCS short message system aiming at the defects in the prior art.

The technical solution of the present invention is: after the short message center receives the short message sent by the short message entity, send it to the designated user, it is characterized in that before sending, it is judged whether the short message is a super long short message; if not, it is sent directly; If so, store the whole segment of the ultra-long and short message in the database, split a segment from the starting position and send it; then judge whether the remaining part is an ultra-long and short message, if not, send it directly; if so, separate a segment and send it, until it is sent.

For the splitting, message bodies of different encoding types are split in different ways. If the short messages are all single-byte coded, they can be split directly without scanning, or by scanning. If the encoding of the short message is Chinese encoding, then use scanning to record the number of single-byte encoded characters (such as English, numbers, etc.) within the maximum length of the short message content allowed by the air interface. The parity of the number of bytes determines the length of the message segment sent this time. If it is the maximum length allowed by the air interface -1 or it is the maximum length allowed by the air interface, so as to ensure that there will be no garbled characters.

In the present invention, the initial offset and the length of the short message segment under each split are recorded, the initial offset of the latter section is equal to the initial offset of the previous section plus the length of the previous section, The start offset of the last segment plus the length is equal to the length of the entire short message.

The technical solution of the present invention can be: after the short message center receives the short message sent by the short message entity, send it to the designated user, which is characterized in that before sending, it is judged whether the short message is a super long short message; if not, it is directly sent ; If so, store the entire segment of the ultra-long short message in the database and split it by scanning; for the segmented short message, use the starting offset and length of each segment to mark, and the starting offset of the latter segment The value of the amount is the start offset of the previous segment plus the length of the previous segment; then the message segment after splitting is sent segment by segment.

The billing in the technical solution of the present invention is to carry out subsequent processing such as billing after all message segments have been sent.

Adopting the technical solution of the present invention does not increase the processing of storing short messages in the database of the short message center. For the storage of short messages, it is only a short message, and the scanning of long messages only needs to be scanned for 3 times at most, which improves the efficiency of short messages. The processing efficiency of the center also ensures the reliability and stability of the system. What's more important is that this splitting method has no extra requirements for the network and the mobile terminal, and the short message center can fully guarantee the correct splitting of long and short messages.

Description of drawings

Fig. 1 shows the composition of PCS short message system;

Fig. 2 shows the flow chart of short message center sending long message;

Fig. 3 has shown the situation that long message does not record in the database before splitting;

Fig. 4 shows the situation recorded in the database when the first message is sent after the long message is split;

Figure 5 shows the situation recorded in the database when the second segment of the message is split after the first segment of the long message is successfully sent;

FIG. 6 shows the situation recorded in the database when the last segment of a long message is sent.

Detailed ways

Add two attribute items of the long message on the basis of the original short message information stored in the SMS center: the length of the currently sent message segment (cur_UDLen) and the starting offset of the currently sent message (cur_UDOffset), adding these two The attribute item can store the entire long message in the database in the short message system, and the content of the message to be sent can be obtained only according to the offset and the length of the current message, and can be retried when the message fails to be sent. It is not necessary to scan the entire message again to obtain the content and length of the message to be sent; the sending order of the split message is also guaranteed by these two attribute items, and only after the current message is correctly received by the user, will the Send the next piece of message; when all the message pieces are successfully received by the user, the SMS center will charge, and only charge according to the cost of one message. If during the sending process, the sending of a certain segment of the message permanently fails, then the subsequent message segment will not be sent, and the SMS center will not charge for this long message, because the user has not received all the messages completely.

Since the length of a single segment when splitting is closely related to the maximum message length allowed to be transmitted by the actual air interface, the following description is based on the assumption that the air interface is 116 bytes.

An embodiment of the present invention is:

When the length of a new message to be sent is too long, scan backward from the current short message offset. Since there are single-byte and double-byte encoded characters in the message body, scanning is performed to ensure that there are no garbled characters in the sent message segment. The principle of scanning is: within the range of the maximum length of the short message content allowed by the air interface (currently 116 bytes), record the number of single-byte encoded characters, and determine the number of characters according to the parity of the number of single-byte encoded characters. Determine whether the length of the message segment sent this time is the maximum length allowed by the air interface -1 or the maximum length allowed by the air interface.

The length of the currently sent message segment (cur_UDLen) and the initial offset of the currently sent message (cur_UDOffset) are recorded in the database of the SMS center. With these two values, it is possible to know which section of the currently sent message is, and to judge whether this section of message has been accepted by the user according to the paging result in the end call message response. If the user has already received this message, the SMS center modifies these two attribute values, and then starts scanning and sending a new message from the changed starting offset (cur_UDOffset) of the current message, and records this time at the same time The length of the sent message segment (ur_UDLen).

Another embodiment of the present invention is: first splitting the ultra-long and short messages by means of scanning, and then sending them segment by segment. The start offset and length are also recorded for each message segment.

The first embodiment of the present invention will be illustrated below with reference to the accompanying drawings. Except for the above differences, the second embodiment is the same as the first embodiment and will not be described in detail.

The current ultra-long messages are sent from the external message entity to the SMS center. As shown in Figure 2, the SMS center receives the short message submitted by the external message entity, and after a series of processing such as authentication, sends the short message specified in the message. The user sends the message. Before the final call, it is judged whether the message is an overlong message, if so, the SMS center will split it, and send the message in segments in sequence, if it is not overlong, it will be sent directly. The specific split plan is as follows:

Assuming that the SMS center receives a super long message with a length of 254 bytes (254 bytes is the maximum message body allowed by SUBMIT_SM defined in the smpp3.4 protocol), the steps for the SMS center to deliver the message are as follows :

Step 1: Save the short message in the short message database, where UDLen records the length of the short message, and both cur_UDOffset and cur_UDLen are 0, which is the initial state before splitting, see Figure 3;

Step 2: Split the first segment of the message. At this time, scan the short message from the current short message offset cur_UDOffset to obtain the length of the message delivered this time. Record the length of the message sent this time in cur_UDLen, as shown in Figure 4, the message between cur_Offset+cur_UDLen is the content of the message sent this time, when the message is not sent successfully and needs to be retried, according to cur_offset and cur_UDLen You can know which segment of the message needs to be retried

Step 3: After a message is sent successfully, change the offset cur_UDOffset of the short message. The current cur_UDOffset is the offset of the last time and move back the number of bytes of the message sent last time, that is, cur_UDOffset=cur_UDOffset+cur_UDLen, and then if If the remaining messages still need to be split, scan the messages according to the second step to determine the message segment delivered this time, as shown in Figure 5;

Step 4: After the last message is successfully sent, the current offset cur_UDOffset and current message length cur_UDLen in the short message table are shown in Figure 6. At this time, judge whether the sum of cur_UDOffset and cur_UDLen is equal to the length of the short message UDLen can know whether all message segments of this long message have been sent successfully, and then perform subsequent processing such as billing;

So far, all the sending of a long message has been completed. If any part of the message fails to be sent permanently during the process of sending the message segment, then the subsequent messages will not be sent, and no billing will be performed. All long messages will be split and sent The guarantee of the order of time and the guarantee of billing only after the sending is successful are based on whether the equation (cur_UDOffset+cur_UDLen)==UDLen holds true.

To sum up, by adopting the technical solution of the present invention, only two fields are added in the database, the problem of processing long messages in PCSSC can be realized very simply, and the system processing capacity and efficiency of the SMS center are guaranteed. In the short message system of G network and C network, there is no ability to send long messages, but the agreement with ESME stipulates that super long messages cannot be sent to the SMS center. C network to be applied.

Claims (5)

1, a kind of method of PCS short message system sending short message, after short message center receives the short message that short message entity sends, send to designated user, it is characterized in that before sending, judge whether short message is super long short message If not, send directly; if so, store the whole section of the ultra-long short message in the database, split a section from the starting position and send it, and the splitting is directly splitting the short message encoded by single byte; Single-byte coded short messages are scanned to record the number of single-byte coded characters within the maximum length of the short message content allowed by the air interface, which is determined according to the parity of the number of single-byte coded characters Is the length of the message segment sent this time the maximum length allowed by the air interface -1 or the maximum length allowed by the air interface; then judge whether the remaining part is a super long or short message, if not, send it directly; if so, remove it A segment is sent until the send is complete. 2, the described method of PCS short message system of claim 1 sends short message, it is characterized in that, the starting offset and the length of the short message segment under splitting at every turn are recorded, the starting offset of the latter section The amount is equal to the start offset of the previous segment plus the length of the previous segment, and the start offset of the last segment plus the length is equal to the length of the entire short message. 3. The method for sending a short message by the PCS short message system according to any one of claims 1 to 2, characterized in that, after the short message is sent, the charging follow-up processing is performed. 4, a kind of method of PCS short message system sending short message, after short message center receives the short message that short message entity sends, send to designated user, it is characterized in that before sending, judge whether short message is super long short message ; If not, send directly; if so, store the entire section of the ultra-long short message in the database and split it by scanning. The splitting is directly splitting the single-byte encoded short message; For short messages, record the number of single-byte coded characters, and determine whether the length of the message segment sent this time is the maximum length allowed by the air interface -1 or the length allowed by the air interface according to the parity of the number of single-byte coded characters The maximum length of the short message segment; for the split short message segment, it is marked with the start offset and length of each segment, and the value of the start offset of the latter segment is the start offset of the previous segment plus the previous segment length; and then sent segment by segment according to the split message segments. 5. The method for sending short messages by the PCS short message system according to claim 4, characterized in that, after all the message segments have been sent, the charging follow-up processing is performed.

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