CN107645700A - A kind of mobile data transmission method based on USSD agreements - Google Patents
A kind of mobile data transmission method based on USSD agreements Download PDFInfo
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Abstract
The present invention relates to a kind of mobile data transmission method based on USSD agreements, breaches limitation of traditional USSD agreements to data length in transmitting procedure；Up first bag PSSR message uses 7bit encoding schemes, can adapt to different MSC/HLR and USSDC network environment；The maximum number of byte that each subpackage of up-downgoing can be transmitted is calculated, efficiency of transmission is improved under the premise of meeting as defined in agreement；Using clear logic, simple repeating transmission affirmation mechanism is realized, and acknowledgement frame is responded without transmitting terminal, reduces propagation delay time.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of mobile data transmission side based on USSD agreements
Method.
Background technology
USSD (Unstructured Supplementary Service Data) technical definition is mobile terminal and network
By attaching position register (HLR) transmission information and a kind of mechanism of instruction between.When user uses USSD business,
The service code that operator defines directly is dialled on mobile terminals, is facilitated as dialing.When user is in roaming state, USSD
Signaling can be routed back to the mobile network of ownership.
USSD has following features：
1st, response quickly：In interactive application, once connected due to need to only establish, reduce and repeatedly establish signaling connection
Time delay, the response time back and forth once is shorter than short message service；
2nd, it is easy to operate：User directly inputs USSD command-strings without carrying out menu setecting step by step；
4th, it is generally applicable：It can substantially be run on GSM mobile handsets all at present；
5th, function is strong：Service can be provided with conversational mode and information service menu mode.
USSD has as a drawback that：
1st, USSD agreements are strictly limited the length of up-downgoing message, according to the regulation of the agreements of GSM 02.09, USSD characters
The maximum length of string is 160 bytes, but also to be limited simultaneously by lower layer protocols such as TCAP, for different situations, USSD characters
The maximum length of string is as shown in table 1.
The USSD character string maximum lengths of table 1
2nd, need to formulate unified subpackage length, the frame format of each attached bag, encoding and decoding side for USSD data divided stator frame
Formula, and attached bag confirm retransmission mechanism；
3rd, part public network MSC equipment can not forwarding terminal first wrap PSSR message and give USSDC (unstructured assistance data clothes
Business center), it is necessary to specially carry out encoding and decoding conversion to the first bag PSSR message.
The content of the invention
In view of above-mentioned analysis, the present invention is intended to provide proposing a kind of mobile data transmission side based on USSD agreements
Method, realize and carried out data transmission between mobile terminal and USSDC using USSD signalings；USSD data are unpacked length, data are compiled
Decoding process and attached bag confirm that retransmission mechanism proposes solution method.
The purpose of the present invention is mainly achieved through the following technical solutions：
A kind of mobile data transmission method based on USSD agreements, comprises the following steps：
Step S1, transmitting terminal carries out processing of unpacking to the upstream data to be sent more than USSD agreement specific lengths；
Step S2, transmitting terminal calculates subpackage quantity according to the size of packet to be sent, and encapsulates each subpacket data frame；
Step S3, transmitting terminal will be sent to USSDC after first sub- packet encoder；
Step S4, first USSD message that USSDC receiving end/sending ends are sent, decode and sent after extracted valid data true
Information is recognized to transmitting terminal；
Step S5, the confirmation that transmitting terminal is sent according to USSDC sent after follow-up attached bag is encoded successively to
USSDC；
Step S6, after USSDC confirms that upstream data finishes receiving, USSDC sends downstream response data to transmitting terminal.
Further, in the step S6, carry out unpacking processing when response data is more than USSD agreement specific lengths simultaneously
Sent after encapsulating each subpacket data frame.
Further, the encapsulation in the step S2 and step S6 is to increase by 2 words to the first bag data in up attached bag
Base64 codings are carried out after saving stem, 1 byte verification, boot symbol, service codes and end code, then carries out 7bit and encodes to form first
Bag data frame；After data in remaining up bag and descending all attached bags are increased with 2 byte headers, the verification of 1 byte and end code
8bit is carried out to encode to form remaining bag data frame.
Further, the length of up first bag data need to meet condition：
N be the first bag data length, x be when 2+n+1 not
The byte number filled when can be divided exactly by 3, x ＜ 3,133 are that mobile terminal as defined in USSD initiates first that USSD transmits data
The maximum number of byte of message；According to above formula, it is 102 words that mobile terminal, which initiates the subpackage length that USSD transmission data first are wrapped,
Section, i.e., when the length of data to be sent is more than 102 bytes, it is necessary to carry out processing of unpacking.
Further, the maximum length in remaining described up bag and descending all attached bags is 150 bytes.
Further, 2 byte headers, effectively transmission data Data, 1 byte school are included in each subpacket data frame
Test, wherein, 2 byte headers include：End mark position EofFlag, current data number of frames SeqNum and Data data length
Length；The end mark position EofFlag length is 2bit, and 0 represents that this frame is not last frame, and 1 represents that this frame is last
One frame；The current data number of frames SeqNum length is 6bit, and since 1, scope is that 1~63,0 expression is invalid；It is described
Data data lengths Length is 8bit；1 byte is verified as CRC, for verifying the integrality and correctness of the data frame, with place
Manage possible error code.
Further, in step S3, up first bag data is encoded into character visible string by Base64, concatenated
Behind boot symbol, Service Code, separator " * ", USSD String finally plus after end mark " # " are formed, then to whole
USSD String carry out 7bit codings, are transmitted afterwards according to public network USSD flow.
Further, in step S4, after USSDC receives first USSD message of transmitting terminal transmission, first to whole
USSD String carry out 7bit decodings, remove boot symbol, Service Code, separator " * " and end mark " # ", then right
Data carry out Base64 and decode to obtain initial data, and extracted valid data Data.
Further, in step S5, the coded system of the up USSD attached bags after first USSD message uses 8bit
Coding is transmitted；USSDC is sent to the receive the 2nd to second-to-last subpacket data confirms data frame, and transmitting terminal receives one
Just start the transmission of next subpacket data after the confirmation message of attached bag, otherwise an attached bag on Retransmission timeout；In step S6, descending sound
The coded system of each USSD attached bags of data is answered to be transmitted using 8bit codings；When USSDC acknowledge receipt of to be up last
After one frame attached bag, directly first attached bag in downstream response data is sent to transmitting terminal.
Further, it is judged as last bag if EofFlag fields in the attached bag that USSDC ends receive are 1, by all receipts
Valid data to attached bag combine reduction in order.
The present invention has the beneficial effect that：
1st, the present invention proposes a kind of mobile data transmission method based on USSD agreements, breaches traditional USSD associations
Discuss the limitation to data length in transmitting procedure；
2nd, up first bag PSSR message uses 7bit encoding schemes, can adapt to different MSC/HLR and USSDC networking
Environment；
3rd, the maximum number of byte that each subpackage of up-downgoing can be transmitted is calculated, is improved under the premise of meeting as defined in agreement
Efficiency of transmission；
4th, the present invention is using clear logic, the simple repeating transmission affirmation mechanism of realization, and acknowledgement frame is done without transmitting terminal
Go out response, reduce propagation delay time.
Brief description of the drawings
Accompanying drawing is only used for showing the purpose of specific embodiment, and is not considered as limitation of the present invention, in whole accompanying drawing
In, identical reference symbol represents identical part.
Fig. 1 is data subpackage form schematic diagram to be sent；
Fig. 2 is USSD uplink service interaction diagrams.
Embodiment
The preferred embodiments of the present invention are specifically described below in conjunction with the accompanying drawings, wherein, accompanying drawing forms the application part, and
It is used for the principle for explaining the present invention together with embodiments of the present invention.
The specific embodiment of the present invention, discloses a kind of mobile data transmission method based on USSD agreements,
Specifically include following steps：
Step S1, transmitting terminal carries out processing of unpacking to the upstream data to be sent more than USSD agreement specific lengths
In view of data packet header afterbody and the expense of encoding and decoding, if data length to be sent exceedes defined byte number,
Then according to subpackage length calculation method, each packet length divided stator frame is determined.
The subpackage length calculation method, comprises the following steps：
1) length of the first bag subpackage is calculated
Provided according to agreement, a piece of news of data is transmitted for USSD, the USSD that mobile terminal is initiated is maximum to be supported
133 bytes, USSD 144 bytes of maximum support that network is initiated, unified in order to reach, the present invention is according to the strict word of condition 133
Save to calculate.
Assuming that the first bag subpackage length is n, the framing process of USSD a piece of news is：
A, 2 byte headers and the verification of 1 byte are increased for attached bag, it is (2+n+1) byte subdata frame to form length.
B, subdata frame carries out base64 codings, and adds boot symbol, service codes and end code.
, it is necessary to which subdata frame length byte number is 3 integral multiple during subdata frame progress base64 codings；It is if discontented
Foot is, it is necessary to be filled.Assuming that filling length is x bytes, then need to meet the integral multiple that (2+n+1+x) is 3, and x<3；To it
Base64 codings are carried out, and plus after boot symbol, service codes and end mark, length is：(8+ (2+n+1+x) * (4/3)+1) individual word
Symbol.
C, 7bit codings are carried out to the data frame of formation, forms USSD a piece of news, then message-length is：(8+(2+n+
1+x)*(4/3)+1)*(7/8)。
In summary, the first bags of USSD subpackage length needs to meet：
①(8+(2+n+1+x)*(4/3)+1)*(7/8)≤133；
(2. 2+n+1+x) is 3 integral multiple.
Under this constraints, it is 102 that n maximums, which are calculated, and therefore, the first bag subpackage maximum length is 102 bytes.
Therefore, if the length of data to be sent more than 102 bytes, it is necessary to subpackage handle.
2) remaining bag subpackage length computation
Unified in order to reach, remaining message of USSD transmission data calculates according to the strict byte of condition 154.Assuming that its
Remaining bag subpackage length is n, and the framing process of remaining message of USSD is：
A, increase by 2 byte headers and the verification of 1 byte for attached bag, form the subdata frame that length is (2+n+1) byte.
B, end code is added for subdata frame, the length of subdata frame is：+ 1 character of (2+n+1) byte.
C, 8bit codings are carried out to the data frame of formation, it is (2+n+1)+1 byte USSD message to form message-length.
In summary, remaining bag subpackage length of USSD needs to meet：(2+n+1)+1≤154
Under this constraints, it is 150 that n maximums, which are calculated, and therefore, remaining bag subpackage maximum length is 150 bytes.
As shown in figure 1, after data to be sent are unpacked according to subpackage length calculation method, first sub-packet length is 102 words
Section, remaining sub-packet length is 150 bytes, and its last 1 sub-packet length can be less than 150 bytes, is then each attached bag increase by 2
Byte header and the verification of 1 byte, form subpacket data frame.
Step S2, transmitting terminal calculates subpackage quantity according to the size of packet to be sent, and encapsulates each subpacket data frame
Comprising 2 byte headers, effectively transmission data Data, the verification of 1 byte in each subpacket data frame, including at least such as table
Five fields shown in 2.Wherein,
EofFlag is end mark position, and 0 represents that this frame is not last frame, i.e. the SeqNum fields of this frame are not current
The maximum of transmission, 1 represents that this frame is last frame, i.e. the SeqNum fields of this frame are the maximums of current transmission；
SeqNum is current data number of frames, and since 1, scope is that 1~63,0 expression is invalid；
Length identifies Data data lengths；
Data is effective data content；
CRC is used for the integrality and correctness for verifying the data frame, to handle possible error code.
The subpacket data frame field of table 2
| Field | Length |
| EofFlag | 2bit |
| SeqNum | 6bit |
| Length | 8bit |
| Data | — |
| CRC | 8bit |
Step S3, transmitting terminal will be sent to USSDC after first sub- packet encoder
Because part public network MSC does not support to forward up (terminal to USSDC) first to wrap PSSR message, it is necessary to be encoded
After send, up first bag data is encoded into character visible string by Base64 first, be serially connected in boot symbol,
Behind Service Code, separator " * ", USSD String finally plus after end mark " # " are formed, then to whole USSD
String carries out 7bit codings, is transmitted afterwards according to public network USSD flow.
Step S4, first USSD message that USSDC receiving end/sending ends are sent, decode and sent after extracted valid data true
Information is recognized to transmitting terminal
After USSDC receives first USSD message of terminal transmission, 7bit solutions are carried out to whole USSD String first
Code, removes boot symbol, Service Code, separator " * " and end mark " # ", and then carrying out Base64 to data decodes
To initial data, and extracted valid data Data.
Step S5, the confirmation that transmitting terminal is sent according to USSDC sent after follow-up attached bag is encoded successively to
USSDC
The coded system of up USSD attached bags and descending USSD attached bags after first USSD message is encoded using 8bit
It is transmitted；
Receiving terminal is sent to each subpacket data received confirms data frame, and transmitting terminal receives the confirmation message of an attached bag
Just start the transmission of next subpacket data afterwards, otherwise an attached bag on Retransmission timeout.
Step S6, after USSDC confirms that upstream data finishes receiving, USSDC sends downstream response data to transmitting terminal
If the attached bag that receiving terminal judges to receive is last bag (EofFlag fields are 1), receiving terminal receives attached bag by all
Valid data (Data fields) combine reduction in order, data are handled accordingly as needed afterwards, processing complete
Afterwards, downstream response data are sent to transmitting terminal；The coded system of each USSD attached bags of downstream response data using 8bit encode into
Row transmission；When USSDC acknowledge receipt of for up last frame attached bag after, do not send confirmation data frame, directly to transmitting terminal send out
Send first attached bag in downstream response data.
Carry out data transmission by taking USSD uplink services as an example, data transmission procedure is as follows：
Assuming that mobile terminal upstream request message need to be split as two subpacket transmissions, USSDC replys response message and equally needed
Two subpacket transmissions are split as, detailed interaction flow is as shown in Fig. 2 substep parsing is as follows.
1st, mobile terminal carries out subpackage to data to be sent, USSD content formats such as table 3 in up first attached bag PSSR
It is shown；
3 up first attached bags of table
2nd, the content of up first attached bag of MSC/HLR transparent transmissions；
3rd, USSDC sends the confirmation message USSR to up first attached bag, and frame format is as shown in table 4；
The confirmation message USSR of table 4
| Citing： | # |
| Field meanings | End mark |
| Length (byte) | 1 byte |
| Coded system | Sent after 8bit codings |
4th, MSC/HLR transparent transmissions confirmation message USSR content；
5th, after terminal receives confirmation message USSR, last up attached bag, the USSR message content formats such as institute of table 5 are sent
Show；
Last the up attached bag of table 5
6th, the content of last up attached bag of MSC/HLR transparent transmissions；
7th, after USSDC receives last up attached bag, (EofFlag fields are as last frame for the data that judge to receive
1) confirmation message, need not be now sent, descending first attached bag will be directly transmitted after response contents subpackage, message content format is such as
Shown in table 6；
6 descending first attached bags of table
8th, the content of descending first attached bag of MSC/HLR transparent transmissions；
9th, terminal sends the confirmation to descending first attached bag, and message content format is as shown in table 7；
The confirmation message of table 7
| Citing： | # |
| Field meanings | End mark |
| Length (byte) | 1 byte |
| Coded system | Sent after 8bit codings |
10th, the content of MSC/HLR transparent transmissions confirmation message；
11st, after USSDC receives confirmation message, last descending attached bag of subpackage is sent, message content format such as table 8
It is shown；
Last the descending attached bag of table 8
12nd, the content of last descending attached bag of MSC/HLR transparent transmissions；
13rd, terminal sends the confirmation to last descending attached bag, and message content format is as shown in table 9；
The confirmation message of table 9
| Citing： | # |
| Field meanings | End mark |
| Length (byte) | 1 byte |
| Coded system | Sent after 8bit codings |
14th, the content of MSC/HLR transparent transmissions confirmation message.
In summary, the mobile data transmission method based on USSD agreements disclosed in the present embodiment breaches tradition
Limitation of the USSD agreements to data length in transmitting procedure；Up first bag PSSR message uses 7bit encoding schemes, Neng Goushi
Answer different MSC/HLR and USSDC network environment；The maximum number of byte that each subpackage of up-downgoing can be transmitted is calculated, is being met
Efficiency of transmission is improved under the premise of as defined in agreement；The present invention simply retransmits affirmation mechanism using clear logic, realization, and
Acknowledgement frame is responded without transmitting terminal, reduces propagation delay time.
It will be understood by those skilled in the art that realizing all or part of flow of above-described embodiment method, meter can be passed through
Calculation machine program instructs the hardware of correlation to complete, and described program can be stored in computer-readable recording medium.Wherein, institute
Computer-readable recording medium is stated as disk, CD, read-only memory or random access memory etc..
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in,
It should all be included within the scope of the present invention.
Claims (10)
1. a kind of mobile data transmission method based on USSD agreements, it is characterised in that comprise the following steps：
Step S1, transmitting terminal carries out processing of unpacking to the upstream data to be sent more than USSD agreement specific lengths；
Step S2, transmitting terminal calculates subpackage quantity according to the size of packet to be sent, and encapsulates each subpacket data frame；
Step S3, transmitting terminal will be sent to USSDC after first sub- packet encoder；
Step S4, first USSD message that USSDC receiving end/sending ends are sent, decode and send confirmation letter after extracted valid data
Cease to transmitting terminal；
Step S5, sent after the confirmation that transmitting terminal is sent according to USSDC is successively encoded follow-up attached bag to USSDC；
Step S6, after USSDC confirms that upstream data finishes receiving, USSDC sends downstream response data to transmitting terminal.
2. data transmission method according to claim 2, it is characterised in that in the step S6, when response data exceedes
Carry out unpacking during USSD agreement specific lengths and handle and sent after encapsulating each subpacket data frame.
3. data transmission method according to claim 2, it is characterised in that the encapsulation in the step S2 and step S6 is
Carried out after increasing by 2 byte headers, 1 byte verification, boot symbol, service codes and end code to the first bag data in up attached bag
Base64 is encoded, then is carried out 7bit and encoded to form the first bag data frame；To the data in remaining up bag and descending all attached bags
Increase by 2 byte headers, 1 byte verification and end code after carry out 8bit encode to form remaining bag data frame.
4. data transmission method according to claim 2, it is characterised in that the length of up first bag data need to expire
Sufficient condition：N is the length of the first bag data, and x is when 2+n+1 can not
The byte number filled when being divided exactly by 3, x ＜ 3,133 are first of mobile terminal initiation USSD transmission data as defined in USSD and disappeared
The maximum number of byte of breath；According to above formula, it is 102 bytes that mobile terminal, which initiates the subpackage length that USSD transmission data first are wrapped,
I.e. when the length of data to be sent is more than 102 bytes, it is necessary to carry out processing of unpacking.
5. data transmission method according to claim 4, it is characterised in that remaining described up bag and descending all attached bags
In maximum length be 150 bytes.
6. data transmission method according to claim 3, it is characterised in that include 2 words in each subpacket data frame
Stem, effectively transmission data Data, the verification of 1 byte are saved, wherein, 2 byte headers include：End mark position EofFlag, current number
According to number of frames SeqNum and Data data length Length；The end mark position EofFlag length is 2bit, and 0 represents this
Frame is not last frame, and 1 represents that this frame is last frame；The current data number of frames SeqNum length is 6bit, is opened from 1
Begin, scope is that 1~63,0 expression is invalid；The Data data lengths Length is 8bit；1 byte is verified as CRC, for verifying
The integrality and correctness of the data frame, to handle possible error code.
7. data transmission method according to claim 1, it is characterised in that in step S3, up first bag data is passed through
Cross Base64 and be encoded into character visible string, be serially connected in boot symbol, Service Code, behind separator " * ", finally plus knot
USSD String are formed after beam symbol " # ", then 7bit codings are carried out to whole USSD String, afterwards according to public network USSD stream
Journey is transmitted.
8. data transmission method according to claim 1, it is characterised in that in step S4, USSDC receives transmitting terminal hair
After first USSD message sent, 7bit decodings are carried out to whole USSD String first, remove boot symbol, Service
Code, separator " * " and end mark " # ", Base64 then is carried out to data and decodes to obtain initial data, and extract significant figure
According to Data.
9. data transmission method according to claim 2, it is characterised in that in step S5, after first USSD message
Up USSD attached bags coded system using 8bit coding be transmitted；USSDC is to the receive the 2nd to second-to-last attached bag
Data, which are sent, confirms data frame, and transmitting terminal receives the transmission for just starting next subpacket data after the confirmation message of an attached bag, no
A then attached bag on Retransmission timeout；In step S6, the coded systems of each USSD attached bags of downstream response data using 8bit encode into
Row transmission；When USSDC acknowledge receipt of for up last frame attached bag after, directly to transmitting terminal send downstream response data in
First attached bag.
10. data transmission method according to claim 9, it is characterised in that if in the attached bag that USSDC ends receive
EofFlag fields are 1 and are judged as last bag, and all valid data for receiving attached bag are combined into reduction in order.
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| CN107645700B (en) | 2020-10-27 |
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