CN1635753A - A method for reducing data transmission traffic in GPRS system - Google Patents

A method for reducing data transmission traffic in GPRS system Download PDF

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Publication number
CN1635753A
CN1635753A CNA2003101177072A CN200310117707A CN1635753A CN 1635753 A CN1635753 A CN 1635753A CN A2003101177072 A CNA2003101177072 A CN A2003101177072A CN 200310117707 A CN200310117707 A CN 200310117707A CN 1635753 A CN1635753 A CN 1635753A
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CN
China
Prior art keywords
gprs
data
communication terminal
mode
control centre
Prior art date
Application number
CNA2003101177072A
Other languages
Chinese (zh)
Inventor
韦昌荣
陈从华
王余良
余建成
高洪君
Original Assignee
厦门雅迅网络股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 厦门雅迅网络股份有限公司 filed Critical 厦门雅迅网络股份有限公司
Priority to CNA2003101177072A priority Critical patent/CN1635753A/en
Publication of CN1635753A publication Critical patent/CN1635753A/en

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Abstract

This invention discloses a method for reducing transmission data flow in GPRS system, the data transmission from control center to GPRS communication terminal adopting UDP mode, the data transmission from control center to GPRS communication terminal adopting TCP mode, in satellite positioning data transmission (such as vehicle positioning), the upper information quantity is much greater than down control instruction, so the upper data transmission adopting UDP mode, one frame length is only half of that of TCP mode, the GPRS system adopting data stream charging, said invention greatly reduces communication fee and saves communication space.

Description

A kind of method that in gprs system, reduces the transmitting data stream amount

Technical field

The present invention relates to reduce in a kind of method that reduces data traffic, particularly gprs system the method for data traffic.

Background technology

In order effectively moving targets such as vehicle to be supervised, need in time to understand the position of target, the satellite fix mode that adopts is mostly come transmission information by gsm system at present, but gsm system owing to charge press line duration so generally can not real-time online, and the vehicle satellite location data is wanted real-time Transmission, therefore message transmission can only solve by modes such as notes, along with development of Communication Technique, gprs system has solved the problem of real-time online, the expense of its communication by data quantity transmitted how much calculate rather than gsm system as long as onlinely just charge.The communication terminal of GPRS is communicated by letter by Transmission Control Protocol or udp protocol dual mode with control centre, and these two kinds of communication modes all must support node GGSN to control by the gateway GPRS in the gprs system, and GGSN also plays acting server simultaneously.But because the GGSN own characteristic can not provide permanent agency to the UDP mode, when promptly adopting UDP mode transmitting downlink data, data can not arrive the GPRS communication terminal, therefore all adopt the TCP mode to transmit data now, definition according to ICP/IP protocol, when adopting the communication of TCP formula, data are by the IP head, protocol header and user data three parts are formed, wherein the IP head is generally 20 bytes, the protocol header of TCP is 20 bytes, and user data divides 20 bytes account and 20 byte user profile in the transmission of vehicle satellite location data, TCP is in order to guarantee reliable transmission, and every frame data all need to reply, and reply data length is 40 bytes, even need sometimes to retransmit, length one group of data is 120 bytes like this, and wherein user profile at most only accounts for the whole sixth of organizing number, and concerning vehicle-mounted global position system, one group of data be will pass by few per three seconds, the very big expense and the waste of communication space therefore caused.

Summary of the invention

The objective of the invention is under the prerequisite that does not reduce user profile, reduce the flow of transfer of data.

The present invention is achieved in that

A kind of method that reduces the transmitting data stream amount in gprs system adopts the UDP mode from the GPRS communication terminal when data are transmitted in control centre, adopt the TCP mode from control centre when the GPRS communication terminal transmits data.

Described data are the vehicle satellite location data.

Described transmission means is preset in communication terminal and the control centre by the mode of parameter setting.

After adopting said method, though GGSN can not provide permanent agency, because the IP address of control centre is fixing IP, GGSN can select route according to purpose IP, thereby the transmitting uplink data of GPRS communication terminal is arrived control centre.Definition according to ICP/IP protocol, when adopting the communication of UDP formula, data also are made up of IP head, protocol header and user data three parts, but the protocol header of UDP is 8 bytes, one frame data length is 68 bytes, and the UDP mode does not need to reply and retransmit, and usually, adopts the every frame data of the comparable TCP transmission means of UDP transmission means to save 52 bytes at least.The main communication data of GPRS communication terminal all is upstream data (per at least three seconds pass once), so the upstream data that passes to control centre from communication terminal adopts the UDP mode to transmit, can save half data traffic of pact at least.For the downlink data that passes to communication terminal from control centre, during owing to employing UDP mode, GGSN can not provide permanent agency, and when promptly adopting UDP mode transmitting downlink data, data can not arrive the GPRS communication terminal.And when adopting TCP mode transmitting downlink data, GGSN can be that the TCP link keeps permanent agency, promptly as long as the TCP link exists, just can bring into play the responsibility of communication agent, can guarantee the proper communication of GPRS communication terminal upstream data and control centre's upstream data.As long as the GPRS communication terminal is online, control centre can be transferred to instruction on the GPRS terminal at any time.Therefore control centre can only adopt the TCP mode to communicate when GPRS communication terminal transmission data.And generally to the vehicle-mounted relatively vehicle location information of transmitting to control centre of the director data of communication terminal (promptly vehicle-mounted) seldom by control centre, so it is downlink data only accounts for seldom part of GPRS communication terminal communication data, little to the data traffic influence of GPRS communication terminal.Therefore adopt all transmission data after this method approximately to have only original half, thereby reach the purpose of the data traffic that reduces the GPRS communication terminal, saved a large amount of communication costs, also saved a large amount of communication spaces simultaneously.

Embodiment

The present invention will be further described below in conjunction with specific embodiment.

In the vehicle global position system, on vehicle, be provided with and comprise satellite positioning receiver, GPRS Control on Communication and satellite location data handled and to the ride terminal that communication controler is controlled, be collectively referred to as the GPRS communication terminal.When the GPRS Control on Communication being carried out parameter just firstization is provided with, can in advance the uplink communication protocol parameter be made as the TCP mode, at the communication software GPRS server of control centre's outfit with gprs system, the GPRS communication terminal is realized communicating by letter by GGSN with the GPRS server.The GPRS server adopts two network interface card structures, and one of them IP address is Intranet IP, and an IP address is a public network.Embodiments of the invention are used for control centre the driving trace of controlled vehicle are monitored in real time.The GPRS communication terminal is according to the requirement of control centre, according to certain interval (time interval, distance are at interval) to data such as its positional information of central transmission (longitude, latitude), speed, traffic direction and times.For example, controlled vehicle is a bank note transport car, and the predetermined 2 seconds latitude, longitude to control centre's transmission of location information (degree, minute, second), are exercised direction (degree, minute, second) and time (year, month, day, hour, min, second) speed of a motor vehicle (km/hour).The GPRS communication terminal can adopt TCP, also can adopt UDP mode and control centre to communicate, the GPRS server of control centre can support the GPRS communication terminal simultaneously to control centre's transmission data the time, after the parameters such as the public network IP of given GPRS server and udp port number, data can be transferred to control centre by UDP.Though the UDP mode is unreliable transmission, the center no response may pass sometimes and lose, and data passed one group in per at least three seconds in the vehicle satellite fix, so lose one group occasionally information of vehicles were not had too much influence.Meanwhile, for the instruction that makes control centre can send to the GPRS communication terminal, need the GPRS communication terminal to set up TCP and be connected with the GPRS server.Like this, both can guarantee that control centre sent instructions to the reliability of GPRS communication terminal, can guarantee again that GPRS terminal upstream data can arrive data center, can save the data traffic of GPRS communication terminal simultaneously, thereby reach the purpose of saving communication cost.

Claims (3)

1, a kind of method that reduces the transmitting data stream amount in gprs system is characterized in that: adopt the UDP mode from the GPRS communication terminal when data are transmitted in control centre, adopt the TCP mode from control centre when the GPRS communication terminal transmits data.
2, a kind of method that reduces the transmitting data stream amount in gprs system as claimed in claim 1, it is characterized in that: described data are the vehicle satellite location data.
3, a kind of method that reduces the transmitting data stream amount in gprs system as claimed in claim 1, it is characterized in that: described transmission means is preset in communication terminal and the control centre by the mode of parameter setting.
CNA2003101177072A 2003-12-30 2003-12-30 A method for reducing data transmission traffic in GPRS system CN1635753A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2003101177072A CN1635753A (en) 2003-12-30 2003-12-30 A method for reducing data transmission traffic in GPRS system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2003101177072A CN1635753A (en) 2003-12-30 2003-12-30 A method for reducing data transmission traffic in GPRS system

Publications (1)

Publication Number Publication Date
CN1635753A true CN1635753A (en) 2005-07-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
CNA2003101177072A CN1635753A (en) 2003-12-30 2003-12-30 A method for reducing data transmission traffic in GPRS system

Country Status (1)

Country Link
CN (1) CN1635753A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103037321A (en) * 2011-10-06 2013-04-10 通用汽车有限责任公司 Method of communicating with a vehicle having a telematics unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103037321A (en) * 2011-10-06 2013-04-10 通用汽车有限责任公司 Method of communicating with a vehicle having a telematics unit
CN103037321B (en) * 2011-10-06 2017-03-01 通用汽车有限责任公司 Method with the vehicle communication with telematics unit

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