CN1388687A - Radio vehicle area network gateway - Google Patents
Radio vehicle area network gateway Download PDFInfo
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- CN1388687A CN1388687A CN 02137844 CN02137844A CN1388687A CN 1388687 A CN1388687 A CN 1388687A CN 02137844 CN02137844 CN 02137844 CN 02137844 A CN02137844 A CN 02137844A CN 1388687 A CN1388687 A CN 1388687A
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Abstract
The radio vehicle network gateway is used in coach bus, railway train and other high speed traffic facility. The mobile terminals in the carriages constitute the radio vehicle network. The gateway consists of WPAN module, antenna inside carriage, microprocessor, PCM coding and decoding device, cellular network module, D/A converter, variable gain RF powr amplifier and quarter wave antenna outside the carriage. The microprocessor and PCM coding and decoding device are connected separately with WPAN module and cellular network module; the D/A converter input is connected to the microprocessor; the D/A converter and the cellular network module output is connected the variable gain RF power amplifier; the output end of variable gain RF power amplifier is connected to the quarter wave antenna and RF input end the quarter wave antenna is connected to the cellular network module.
Description
One, technical field:
The present invention is used for the vehicles that automobile, train etc. move at a high speed, makes the portable terminal in the compartment form wireless vehicle area network, belongs to the technical field of antenna territory net (WPAN) design.
Two, background technology:
Since last century end, information industry is keeping swift and violent growth momentum, and particularly communication and computer technology have been penetrated into each corner that all trades and professions and people live.People's expectation can be carried out speech and data communication anywhere or anytime.This just needs to use wireless communication technology.To use the gsm system or the cdma system of extensive covering specifically exactly.These system applies are in static or accurate static occasion ideal very, but when portable terminal is in the inside, compartment of the automobile of high-speed motion or train etc., because influencing the factor of electromagnetic wave propagation, the screen effect in metal compartment and Doppler frequency shift etc. exist, communication will run into following point: 1, because signal weakening, portable terminal will have to improve the transmitting power of oneself, with keep with the base station between communicate by letter, this has strengthened power consumption of mobile terminals on the one hand, make shorten the service time of battery, the radiation of excessive on the other hand (about 1 watt) will damage people's health, and this is that the user does not think.2, a little less than signal, arrive to a certain degree,, at this moment just caused the unreliable even interruption of communication even portable terminal with the power emission of maximum, is communicated by letter and still can not normally be carried out.User is undesirable especially for this.Sum up is exactly, and validity, the reliability that improve communication just must improve transmitting power, and owing to the restriction of the structure of portable terminal and operating characteristic power can not be lifted too high.There have been two kinds of methods to solve this contradiction now: 1, directly on portable terminal, to connect external antenna.All can reserve an antennal interface on the general portable terminal, use this interface that antenna is guided to outside the compartment and get final product.This mode has three limitations: one has limited the mobility of portable terminal, and the amplitude that its two performance improves is limited, its three powered battery of still using portable terminal.2, use immediate power amplifier.This method is carried out two-way amplification to all frequency ranges of GSM or cdma system, sends to outside the car after promptly the signal that portable terminal in the car is sent amplifies, and is transmitted in the car after the car external signal is amplified.Do like this and need overcome some difficult points such as the microwave power self feed back, need use some expensive microwave devices, thereby the cost of equipment is very high, and on function, has only realized power amplification, say that totally application cost is too high.
In recent years, be that the WPAN development of representative is swift and violent with bluetooth (Blue Tooth).WPAN with low-power consumption, low radiation, closely, low cost is characteristics, will become a kind of common apparatus of personal mobile communication.WPAN is applied to just constitute in the car wireless vehicle area network, is called for short car territory net.By using vehicle area network gateway, allow portable terminal networking and the switching by gateway in car be connected to Cellular Networks outside the car.Just can well solve the contradiction between transmitting power and the communication quality in this way, realize the optimization of communication system, and, can also provide a lot of new functions, such as providing data, voice communications services for several portable terminals simultaneously owing to formed WPAN; Electronic name card exchanging between different mobile terminal; Even can in car, play internet game.
Three, summary of the invention:
(1) goal of the invention
The purpose of this invention is to provide a kind of in the compartment of motion such as automobile, train framework by the portable terminal of various support WPAN, as mobile phone, notebook computer, PDA etc., the wireless vehicle area network gateway of the wireless vehicle area network of composition.
(2) technical scheme
The present invention is a kind of wireless vehicle area network gateway, this gateway is by WPAN module and car internal antenna, microprocessor, the PCM codec, the Cellular Networks module, the D/A converter, outer 1/4 wavelength antennas of controllable gain radio-frequency (RF) power amplification car is formed, microprocessor and PCM codec wirelessly are connected with the Cellular Networks module respectively with in WPAN module and the car, the input termination microprocessor of D/A converter, the output termination controllable gain radio-frequency (RF) power amplification of D/A converter and Cellular Networks module, outer 1/4 wavelength antennas of the output termination car of controllable gain radio-frequency (RF) power amplification, the rf inputs of outer 1/4 wavelength antennas of car connects the Cellular Networks module; Microprocessor joins with WPAN module and Cellular Networks module respectively by " R232 " interface, and microprocessor joins by 4 parallel-by-bit data wires and D/A converter; The PCM codec joins by analog voice interface and Cellular Networks module, joins by the monolithic bluetooth module in pcm stream interface and WPAN module and the car internal antenna.
The WPAN module is micropower, WPAN radio frequency and baseband circuit cheaply.This partial circuit generally all has ready-made module to sell.It under the control of microprocessor, be responsible for car in the portable terminal exchange message, comprise identity verification, set up data link, set up voice link and transmission corresponding data etc. on link.The Cellular Networks module is general mobile terminal circuits such as GSM, CDMA.This circuit generally also has ready-made module to sell.It becomes the Cellular Networks user of a standard under the control of microprocessor, be responsible for cellular network base stations between all communicate by letter.WPAN module, Cellular Networks module are all passed through the RS232 interface and are linked to each other with microprocessor.Not photocontrol of microprocessor two modules, it still is the path of data flow between two modules, is responsible for the format conversion of data.Voice pathway between two modules is the PCM codec.Because the WPAN module generally only provides the PCM data-interface, and the Cellular Networks module generally all directly provides analog voice signal, so need add one-level A/D, D/A conversion between the two, this transducer is the PCM codec.When work, the signal strength information that microprocessor also will provide according to the Cellular Networks module, calculate the required gain of radio-frequency (RF) power amplification, inform the D/A converter by 4 parallel-by-bit data port, produce the power output that 16 grades of analog levels are directly controlled radio-frequency (RF) power amplification by the D/A converter, deliver to 1/4 wavelength antennas that is positioned at outside the car body.The input source of radio-frequency (RF) power amplification is directly provided by the Cellular Networks module.And the input of the radio frequency of Cellular Networks module is provided by antenna.Because use in car, the fluctuation range of supply voltage is bigger, provides the power supply that meets the requirements so increase by a power management module for the each several part of gateway.
When not using vehicle area network gateway as yet, gateway is in holding state.In case have the WPAN portable terminal to enter car body and a certain service of application use, gateway at first requires application equipment that authentication information is provided.Just become a member of this WPAN by this WPAN portable terminal after the authentication.The service that it can use gateway to provide by corresponding WPAN agreement.Microprocessor will be mapped as the service that corresponding Cellular Networks provides by the service request of WPAN module mobile terminal receive and it, and finish and the connecting of Cellular Networks by sequence of operations such as dialing.In data communication process, microprocessor will convert the packet that comes from the Cellular Networks module to packet that the WPAN module is familiar with according to the communication protocol of WPAN and Cellular Networks, equally the packet of WPAN module be converted to the packet of Cellular Networks again.And in voice communication course, the Cellular Networks module will directly provide analog voice signal, and this analog signal sends to the WPAN module by after the PCM encoder.Backward channel is similar with it.
By the access of vehicle area network gateway, constitute WPAN between each portable terminal in the car, and make their energy and the outer Cellular Networks system of car carry out data and Speech Communication.It is the outer powerful system of micropower in a kind of car, car.At present, can use bluetooth or similar system in the car, car is exactly outward common GSM; In the future, the WPAN system that utilized bandwidth is wideer in the car, car is outward the public mobile communication system of 3G or renewal.
(3) technique effect
This invention has following advantage:
1, antenna is installed in outside the car body, has avoided the metal car body, make and communicate by letter more unobstructedly between antenna and the base station, and prevent that aerial radiation from damaging human body shielding electromagnetic waves;
2, gateway and antenna can strengthen its transmitting power, so that higher communication quality to be provided by the power supply of the vehicles such as automobile or train;
3, the portable terminal in the car body is launched with micropower, can prolong the service time of battery effectively, and reduces electromagnetic radiation, reduces the injury to human body;
4, the portable terminal in the car body is formed wireless vehicle area network, swap data easily.As, electronic name card exchanging, networking trivial games etc.
5, this scheme can be used for other similar occasion, in the building with screen effect.
Four, description of drawings
Fig. 1 is a car territory net system schematic.It is any portable terminal, vehicle area network gateway GATE WAY2, the cellular network base stations BS3 that supports WPAN that MOBILE1_1～MOBILE1_n is wherein arranged.
Fig. 2 is a structured flowchart of the present invention.WPAN module and car internal antenna 2.1, microprocessor 2.2.1, PCM codec 2.2.2, Cellular Networks module 2.3, D/A converter 2.4.1, controllable gain radio-frequency (RF) power amplification 2.4.2, the outer 1/4 wavelength antennas 2.4.3 of car are wherein arranged.
Fig. 3 is the structural representation of gateway of the present invention.
Five, embodiment
A vehicle area network gateway is installed in the compartment.Function served as bridge between this gateway one side cycling start territory net and the GSM net is organized into car territory net to each Bluetooth mobile terminal in the car (bluetooth notebook computer, bluetooth cellular phone, bluetooth PDA) on the other hand.This gateway is a standard mobile subscriber for the GSM net, because SIM (Subscriber Identifier Module) card is equipped with in the gateway the inside; And bring the Bluetooth mobile terminal in compartment into for the user, this gateway is the Network Access Point server of holding concurrently.
The specific implementation of the vehicle area network gateway of corresponding and Fig. 2 as shown in Figure 3.
Microprocessor uses the MC68302 of MOTOROLA company.This chip is the microprocessor of 16 bit, the 5V power supply, and operating frequency is 20MHz, and the RS232 serial ports of two 115.2kbps can be provided, and one 4 parallel port.The WPAN module is used the BC02 monolithic Bluetooth chip of CSR company.This chip is integrated radio circuit, Base-Band Processing DSP and a microprocessor, so bluetooth protocol repertory all operates in this chip internal.It connects with microprocessor MC68302 by the RS232 mouth, connects with PCM codec MSM7540L by 4 data lines.The Cellular Networks module is used the MC35 of SIEMENS company, and this module is supported all GSM net characteristics such as EGSM900/GSM1800, GPRS multi-slot class 8.It links to each other with microprocessor by another RS232 mouth, and direct and PCM codec exchange analog voice signal.The available maximum data transfer rate of this module is 85.6kbps.AD7524 is 8 figure place weighted-voltage D/A converters, and we are only with its 1st, 3,5,7 totally 4, remaining the 0th, 2,4,6 position height.The height reference level is changed to 1V, 2.6V respectively.This A/D converter provides 16 grades of power controls for radio-frequency module.RF2173 is the controllable gain radio-frequency power amplifier.The highest transmitting power that provides 4 watts of this amplifier.This is very big for vehicle-carrying communication.The output of power amplifier is fed to the car outside antenna by 50 Ω coaxial lines, and is launched by antenna.
When not having Bluetooth mobile terminal in the car, gateway is in PARK (dormancy) state.Gsm module, PCM codec are not worked at this moment, and microprocessor enters little power consumption state, but and bluetooth module also enters the Discovery Status of little power consumption.When portable terminal entered the compartment and activate self Bluetooth function, terminal was with the Bluetooth gateway around the active inquiry and by sequence of operations such as authentication, service discovery composition WPAN.After the networking, portable terminal just can use gateway and provide all served.What for example enter the compartment is a bluetooth notebook computer.After the networking success, notebook requires to use " Dial-up Network service ".Gateway will be controlled gsm module and dial up on the telephone, and start the GPRS function.Now this notebook just is connected on the Internet, can enjoy the enjoyment of the speed online of the fastest 85.6kbps.When and for example bluetooth cellular phone enters the compartment, also will carry out operations such as a series of link setup, authentication, service discovery between bluetooth module in the mobile phone and the gateway, and finally use the GSM network to carry out voice communication or send SMS message by the switching of gateway.Uniquely with above-mentioned data communication different be that when carrying out voice communication, the path of voice signal is a bluetooth module---PCM codec---gsm module does not pass through microprocessor.Do the utilization rate that can reduce microprocessor like this, so that data communication services at a high speed can also be provided when voice communication is carried out.The transmitting power of portable terminal is extremely low (about 1mW) in above-mentioned all voice, the data communication process, is about the one thousandth of GSM mobile handset.Therefore the energy content of battery that consumes and also be extremely low to the injury of human body.And the antenna that is in outside the compartment can be with bigger power emission signal.This does not worry that on the one hand because car body has shielding action the outer more powerful emission meeting of car damages the human body in the car; Vehicle area network gateway is powered by car on the other hand, need not consider power problems; Have, the car outside antenna can use antenna system again, improves antenna gain, further improves receptivity, reduces radiation.
Claims (3)
1, a kind of wireless vehicle area network gateway, it is characterized in that this gateway is by WPAN module and car internal antenna (2.1), microprocessor (2.2.1), PCM codec (2.2.2), Cellular Networks module (2.3), D/A converter (2.4.1), outer 1/4 wavelength antennas (2.4.3) of controllable gain radio-frequency (RF) power amplification (2.4.2) car is formed, microprocessor (2.2.1) and PCM codec (2.2.2) respectively with WPAN module and car in wireless (2.1) be connected with Cellular Networks module (2.3), the input termination microprocessor (2.2.1) of D/A converter (2.4.1), the output termination controllable gain radio-frequency (RF) power amplification (2.4.2) of D/A converter (2.4.1) and Cellular Networks module (2.3), outer 1/4 wavelength antennas (2.4.3) of the output termination car of controllable gain radio-frequency (RF) power amplification (2.4.2), the rf inputs of outer 1/4 wavelength antennas (2.4.3) of car connects Cellular Networks module (2.3).
2, wireless vehicle area network gateway according to claim 1, it is characterized in that microprocessor (2.2.1) joins with WPAN module and Cellular Networks module (2.3) respectively by " R232 " interface, microprocessor (2.2.1) joins by 4 parallel-by-bit data wires and D/A converter (2.4.1).
3, wireless vehicle area network gateway according to claim 1 and 2, it is characterized in that PCM codec (2.2.2) joins by analog voice interface and Cellular Networks module (2.3), join by the monolithic bluetooth module in pcm stream interface and WPAN module and the car internal antenna (2.1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02137844 CN1388687A (en) | 2002-06-25 | 2002-06-25 | Radio vehicle area network gateway |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02137844 CN1388687A (en) | 2002-06-25 | 2002-06-25 | Radio vehicle area network gateway |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100366108C (en) * | 2004-06-14 | 2008-01-30 | 上海贝尔阿尔卡特股份有限公司 | After No.3 generation mobile communication system, mobile access agent device and mobile communication method |
| CN100442685C (en) * | 2005-09-02 | 2008-12-10 | 东南大学 | Device for forming annular array beam in VAN |
| CN102377818A (en) * | 2010-08-10 | 2012-03-14 | Sk实业株式会社 | Method for providing wireless internet service for a wireless lan terminal in a vehicle, and wireless internet device for a vehicle providing the method |
| CN103024935A (en) * | 2011-09-23 | 2013-04-03 | 通用汽车环球科技运作有限责任公司 | System and method for vehicle based cellular offload |
-
2002
- 2002-06-25 CN CN 02137844 patent/CN1388687A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100366108C (en) * | 2004-06-14 | 2008-01-30 | 上海贝尔阿尔卡特股份有限公司 | After No.3 generation mobile communication system, mobile access agent device and mobile communication method |
| CN100442685C (en) * | 2005-09-02 | 2008-12-10 | 东南大学 | Device for forming annular array beam in VAN |
| CN102377818A (en) * | 2010-08-10 | 2012-03-14 | Sk实业株式会社 | Method for providing wireless internet service for a wireless lan terminal in a vehicle, and wireless internet device for a vehicle providing the method |
| CN103024935A (en) * | 2011-09-23 | 2013-04-03 | 通用汽车环球科技运作有限责任公司 | System and method for vehicle based cellular offload |
| CN103024935B (en) * | 2011-09-23 | 2016-09-14 | 通用汽车环球科技运作有限责任公司 | System and method for honeycomb based on vehicle unloading |
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