CN201114034Y - Close range direct communication mobile phone - Google Patents
Close range direct communication mobile phone Download PDFInfo
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- CN201114034Y CN201114034Y CNU2007200247442U CN200720024744U CN201114034Y CN 201114034 Y CN201114034 Y CN 201114034Y CN U2007200247442 U CNU2007200247442 U CN U2007200247442U CN 200720024744 U CN200720024744 U CN 200720024744U CN 201114034 Y CN201114034 Y CN 201114034Y
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Abstract
The utility model relates to a mobile phone capable of performing close-range direct communication, belonging to the mobile phone communication technical field, wherein, a radio frequency module which is connected with the prior data processor is arranged inside the mobile phone; the operating methods are all realized by utilization of the radio frequency module; a calling party adopts the steps that: firstly, connection test; secondly, calling; thirdly, communication; fourthly, end of a call; a called party adopts the steps that: firstly, waiting for being called; secondly, waiting for answering of a mobile phone user; thirdly, communication; fourthly, end of a call. The mobile phone capable of performing close-range direct communication can reduce the data quantity via communication companies and reduce the call data quantity pressure; users can directly communicate and call for free within an effective range; the mobile phone has good sound quality, low cost and convenient carrying, can receive more users to simultaneously call, and can remotely transmit data and share pictures, music and so on together with surrounding friends at any time.
Description
Technical field
The utility model relates to a kind of mobile phone that can carrying out direct communication in close range, belongs to the mobile communication technical field.
Background technology
Along with the progress of modern technologies, radiotechnics has obtained significant progress.But for masses, the application of radio communication, mobile phone is a topmost aspect.Mobile phone brings the huge while easily in the life of giving people, and the information charge of great number has but been earned by communication company.For the not far people of physical distance, but need mobile phone that signal is sent to communications tower, pass through which floor relaying again, signal is sent to the destination.Such communication modes costs an arm and a leg.
Intercom can be realized closely two machine direct communications, and power just can not be by the expense of eating less than 0.5W.But it is that audio analog signals is directly transferred to transmission, has following shortcoming: 1, be subject to disturb, sound quality is poor; 2, available frequency is limited, can't realize extensive use; 3, confidentiality is poor, is eavesdropped easily.
Summary of the invention
The utility model is at deficiency of the prior art, and mobile phone and method of work thereof that a kind of modern design, anti-interference, good confidentiality can carrying out direct communication in close range are provided.
The utility model adopts following technical proposals:
Be provided with the radio-frequency module that links to each other with existing data processor in the mobile phone.
Described radio-frequency module adopts the chip of following model: nRF905.
The method of work of described mobile phone that can carrying out direct communication in close range, the calling party adopts step as follows:
The first step: test connects: utilize radio-frequency module to call out, if the other side in the effective range district, then can be subjected to the other side's return signal, carry out next step; If the other side not in the effective range district, then sends signal and can not get any answer, terminated call;
Second step: call out: utilize radio-frequency module to send call signal,, carry out next step: if addressee refuses is answered terminated call if the other side answers to the other side;
The 3rd step: communication: timesharing transmission and received signal, when sending signal, then utilize the existing audio collecting device of mobile phone with data adopt into, compress and encrypt gathering the data of coming in, data and geocoding that compression and encryption is good send together by radio-frequency module; During received signal, then deciphering, decompress(ion) restores audio signal then, utilizes the receiver of mobile phone to play;
The 4th step: finish conversation;
The called party adopts step as follows:
The first step: wait for called: if radio-frequency module receives the signal that does not belong to this machine address, then radio-frequency module abandons automatically and does not process; If receive the signal that belongs to this machine address, carry out next step;
Second step: radio-frequency module is delivered to data processor with signal, waits that standby is main answers, if the machine master answers, then enters next step; If machine master refusal is answered, then called end, and send refusal to the other side and answer signal;
The 3rd step: communication: timesharing transmission and received signal, when sending signal, then utilize the existing audio collecting device of mobile phone with data adopt into, compress and encrypt gathering the data of coming in, data and geocoding that compression and encryption is good send together by radio-frequency module; During received signal, then deciphering, decompress(ion) restores audio signal then, utilizes the receiver of mobile phone to play;
The 4th step: finish conversation.
Described compression utilizes mp3 compressed format with audio compression; Described encryption method is as follows:
The first step: A, B two machines want to set up correspondence, need two people to set in advance an identical shared password;
Second step: if A, B two confidential communicating, then this communication module is taken out the phone number of A, B two machines earlier, generates a preliminary password;
The 3rd step: generate signcode with preliminary password and shared password;
The 4th step: utilize signcode that data are encrypted.
Called party's connection procedure can add following authentication process itself:
If the error in data that the calling party sends promptly can not think that then the other side's identity is suspicious by decrypting correct information with signcode to side communication, just beam back a string random number; If caller identity is true, it is invalid then can to recognize this information, continues to call out and send correct information, and the wait called party confirms and connects.
Compared with prior art, the beneficial effects of the utility model are:
1, can reduce the data volume of process communication company, reduce communicating data piezometric power;
2, increase the mobile phone cost slightly, in 100 yuan, can realize the mobile phone direct communication greatly, improve the mobile phone competitiveness greatly;
3, in effective range, the user can direct communication, no-charge call, the expenditure of reduction expense greatly;
4, with the intercom conversation compare, tonequality is good, and is cheap, easy to carry, and can hold more users and converse simultaneously;
5, compare with bluetooth, infrared communication equipment, can the long-distance transmissions data, at any time with friend's image sharing, music etc. on every side.
Description of drawings
Fig. 1 is a circuit module figure of the present utility model;
Fig. 2 is radio frequency module circuit figure of the present utility model;
Fig. 3 is a circuit connection diagram of the present utility model;
Fig. 4 is the transmission receiving course figure of every frame data of the present utility model;
Fig. 5 is the calling party of the present utility model flow chart that connects;
Fig. 6 is the called party of the present utility model flow chart that connects.
Embodiment
The utility model will be further described below in conjunction with accompanying drawing.
Embodiment:
The monolithic wireless transceiver chip nRF905 that radio-frequency module can adopt Norway Nordic Semiconductor ASA company to release, operating voltage is 1.9～3.6V, nRF905 can finish the work of handling prefix and CRC (CRC) automatically, can finish Manchester's code/decoding automatically by hardware in the sheet, use SPI interface and micro-controller communications, dispose very convenient.The nRF905 radio-frequency module can either be launched, and can receive again, only needs its switching working mode of control on the software, promptly can finish quasi-duplex work.Its power consumption is very low, and electric current is 12.5mA when receiving mode, under the sending mode during with the emission of the power output of 10dBm electric current have only 11mA, add certainly after the power amplifier, need electric current big.During nRF905 transmission data is the non real-time mode, and promptly transmitting terminal sends data, is temporary in earlier after receiving terminal is received in the chip memory, and the MCU of outside can reach in chip when needed again.Can send a packet at every turn, the delay of 0.1s is arranged approximately, but people can not feel to some extent to this delays in the conversation, and by metadata cache, guarantee that voice are uninterrupted that the fluency that (overall delay, but uninterrupted) conversed is unaffected.
Radio-frequency module links to each other with data processor, and processor can directly use present mobile phone processor inside, increases some corresponding programs and handles and get final product, and need not increase new processor.
MCU (for example Intel PXA255 processor) is connected with radio-frequency module by control bus (Control among Fig. 1), data/address bus (Data among Fig. 1), signal bus (Signal among Fig. 1).
With Intel PXA255 processor is example, and its pin connection status is as follows:
At first, MCU exports control signal to control bus, radio-frequency module is placed configuration status, by data/address bus (spi bus) configuration words is dealt into radio-frequency module then, finish the configuration of radio-frequency module, the radio-frequency module initial configuration is receiving mode (before the control bus change signal, also under configuration status, can not receive data).Control bus changes signal then, makes radio-frequency module be in accepting state, waits for receiving outer signals.If receive correct signal. radio-frequency module is notified MCU by signal bus, and MCU takes out data by data/address bus (spi bus).
If MCU will send data by radio-frequency module, then earlier radio-frequency module is placed configuration status by control bus, by the change configuration words, make radio-frequency module be configured to sending mode.Control bus changes signal then, makes radio-frequency module be in transmit status, by data/address bus (spi bus) data is delivered to radio-frequency module, and radio-frequency module sends data.
The user adopts different communication modes, selects by communication company or direct communication, and processor can obtain different states, so the data that collection is come in to voice acquisition module are carried out different modes and handled.If the user selects the communication through communication company, then processor sends data as present mobile phone by existing mobile communication mode; If the user selects direct communication, processor just is sent to radio-frequency module with data, by radio-frequency module data is sent to destination address.
A/D in the data acquisition transforms, compress speech, transform etc. with voice decompress(ion), D/A in the voice restoration process, and no matter be use which kind of communication mode, all use identical operations, so circuit and processing mode are not compared not variation with original mobile phone.
Communication equipment is in holding state at ordinary times always, promptly is in the wait called state, and communication process is as follows:
Calling party's (A machine) adopts step as follows:
The first step: test connects: utilize radio-frequency module to call out the B machine, if the B machine is beamed back answer signal, the other side then is described in the effective range district, both sides can communicate, so carry out next step; If in the regular hour, do not receive the answer signal of B machine, then judge the B machine not in the effective range district, terminated call, and the A machine " links unsuccessful " to user prompt;
Second step: call out: utilize radio-frequency module to send call signal to the B machine, ID number (being cell-phone number) being about to AB two machines encrypts with signcode, send to the other side, to prove the identity of oneself to the other side, prove it oneself is not pseudo-installation, at this moment the B machine can have been determined the identity of A machine, and can send the B machine ID that encrypts with signcode, and this moment, the B identity was judged in the deciphering of A machine, if deciphering is unsuccessful, illustrate that data are wrong, the other side has beamed back random number series, if successful decryption, illustrate that then two functions connect and wait for that the other side answers, the A machine " waits for that the other side answers " to user prompt, if the other side answers, carries out next step; If addressee refuses is answered, terminated call, the A machine is to user prompt " the other side is temporary transient is inconvenient to receive calls ";
The 3rd step: communication: timesharing transmission and received signal, when sending signal, then utilize the existing audio collecting device of mobile phone with data adopt into, compress and encrypt gathering the data of coming in, data and geocoding that compression and encryption is good send together by radio-frequency module; During received signal, then deciphering, decompress(ion) restores audio signal then, utilizes the receiver of mobile phone to play; This process is very similar to the mode of present mobile communication, and difference just is the radio transition equipment difference, and mobile phone has adopted antenna for mobile phone, and has adopted radio-frequency module here;
The 4th step: finish conversation;
Being called out (B machine) side adopts step as follows:
The first step: wait for called: if radio-frequency module receives the signal that does not belong to this machine address, then radio-frequency module abandons automatically and does not process; If receive the signal that belongs to this machine address, then carry out next step;
Second step: radio-frequency module is passed to processor with calling party (A machine) ID number, processor control radio-frequency module is beamed back answer signal to the A machine, and the shared signcode of taking-up AB two machines, if at this moment the A machine is received answer signal, send after ID number of AB two machines can being encrypted with signcode, then B machine decryption verification if checking is unsuccessful, is then beamed back random sequence; If be proved to be successful, send the identity of proof oneself after then local B machine ID being encrypted with signcode, at this moment standby is main answers for B mobile phone jingle bell etc., if the machine master answers, then enters next step; If machine master refusal is answered, then called end, and send refusal to the other side and answer signal;
The 3rd step: communication: timesharing transmission and received signal, when sending signal, then utilize the existing audio collecting device of mobile phone with data adopt into, compress and encryption gathering the data of coming in, data and geocoding that compression and encryption is good send together by radio-frequency module: during received signal, and then deciphering, decompress(ion) restores audio signal then, utilizes the receiver of mobile phone to play;
The 4th step: finish conversation.
In the communication process as above, described compression utilizes mp3 compressed format with audio compression; Described encryption method is as follows:
The first step: A, B two machines want to set up correspondence, need two people to set in advance an identical shared password;
Second step: if A, B two confidential communicating, then processor takes out the phone number of A, B two machines earlier, generates a preliminary password;
The 3rd step: generate signcode with preliminary password and shared password;
The 4th step: utilize signcode that data are encrypted;
Illustrate: shared password only need be provided with once, communication later on needn't be provided with again, and in a single day this password set, and the user just needn't be concerned about again, all shared passwords do not need the user to remember, and crack difficulty so the user can get this password setting very complicated the raising; Certainly do not change password for a long time and can reduce fail safe yet, the user will revise password, then must verify its authority, after promptly the user need input the Authority Verification password, can enter the modification rights state, and do not have the people of this authority, and can not check password, more can not revise password, certainly the user must remember the Authority Verification password, just as remembeing present bank card password, verify that here this authority only needs a password, greatly reduces the burden of user's memory cipher.
In the communication process as above, called party's connection procedure can add following authentication process itself:
If the error in data that the calling party sends promptly can not think that then the other side's identity is suspicious by decrypting correct information with signcode to side communication, just beam back a string random number, resist third party's decryption to a certain extent; If rub-out signal comes from unpredictalbe at random mistake, and caller identity is true, so the calling party can to recognize this information invalid, continue to call out and send correct information, the wait called party confirms and connects, if the calling party is third party disguiser, then be difficult to judge that this information is the encryption private mark of random number series or correct information, want to judge, also need carry out more complex calculations, reduce greatly and crack efficient.
Relevant is described as follows:
1, two people will set up correspondence, at first will know the other side's phone number.
2, two people will be provided with the shared password of communication.Under the normal condition, the physiognomy that uses this module can be provided with shared password apart from all not far when two people meet, and two people will converse, and same shared password must be set.If security requirements is not very high, can not establish password, even information also can't be eavesdropped by domestic consumer like this.
When 3, two people communicate by letter, the same with present mobile communication, directly from telephone directory, take out number, or direct dialing numbers, can attempt connecting with the other side.
4, certain, in order not conflict, can set out special-purpose direct communication assignment key, just as present some mobile phone uses two nets simultaneously with the handset call key.Want to utilize communication common carrier communication, just use existing assignment key; Want direct communication, just use the dedicated array of keys of establishing in addition, very easy to use.Whether the user also can be provided with, and is unsuccessful if direct communication connects, and changes over to automatically by communication common carrier and calls out, select these functions to be determined by user oneself fully.
5, radio-frequency module can directly be integrated in the mobile phone, and the user is very convenient to carry, does not need other equipment.This module can also with the more shared devices of mobile phone, such as: power supply, voice acquisition module, circuit board, data processing chip etc. can further reduce cost like this.Under the situation of mass production, if every mobile phone increases this function, the estimated cost increase is no more than 100 yuan, and has this function to get mobile phone, and class will improve greatly, and cost performance is higher.
6, about communication frequency band, can adopt the general free frequency range of country, can freely use as 3 ISM channels of 433/868/915 MHz, perhaps the free frequency range of the 2.4GHz public ISM in the whole world.Certainly, if with this technology large-scale application in communication, can formulate standard specially, set up other frequency range for this reason.
Claims (2)
- One kind can carrying out direct communication in close range mobile phone, it is characterized in that, be provided with the radio-frequency module that links to each other with existing data processor in the mobile phone.
- 2. a kind of mobile phone that can carrying out direct communication in close range as claimed in claim 1 is characterized in that described radio-frequency module adopts the chip of following model: nRF905.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200247442U CN201114034Y (en) | 2007-07-10 | 2007-07-10 | Close range direct communication mobile phone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200247442U CN201114034Y (en) | 2007-07-10 | 2007-07-10 | Close range direct communication mobile phone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201114034Y true CN201114034Y (en) | 2008-09-10 |
Family
ID=39965782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200247442U Expired - Fee Related CN201114034Y (en) | 2007-07-10 | 2007-07-10 | Close range direct communication mobile phone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201114034Y (en) |
-
2007
- 2007-07-10 CN CNU2007200247442U patent/CN201114034Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080910 |