CN1170373C - Community mutual aid type reporting system and method - Google Patents

Abstract

A community mutual aid type reporting system and method, the system includes: a plurality of radios, one of which is an information source; the original information unit comprises an identification code, a digital code of information content/state and a relay sequence digital code; one radio device is a relay machine, and receives and transmits information units one by one when the relay program is executed until the relay program is terminated. The method comprises the following steps: generating and transmitting a raw information unit from an information source; carrying out a relay program of receiving and transmitting, wherein at least one relay machine transmits information by an information unit, and the relay sequence is accumulated in the relay program successively; the relay procedure is terminated. The invention has more convenient and safe communication.

Description

Community mutual aid notification system and method

technical field

The present invention relates to a wireless communication system, and more particularly to a community mutual assistance notification system and method using radio devices.

technical background

At present, wireless communication emphasizes point-to-point interconnection, for example, Party A transmits information to Party B, or Party A and Party B transmit information to each other. However, wireless communication has physical limitations of transceiver devices and restrictions on transmission power by national laws and regulations, which limit the communication distance. Generally speaking, the communication range of legal private wireless intercom equipment is about 20 to 50 meters, and many simple regional communications, such as car siren notification devices, school children's handheld wireless distress devices, and garbage truck arrival notification devices , Fire alarm or burglary alarm notification devices and other regional or short-distance information notification devices, etc., without the assistance of public telecommunication networks or wireless dedicated channels, radio devices lose their convenience in such short communication ranges performance and reliability.

The use of public telecommunication (PSTN) or the setting of wireless dedicated channels helps to break through the limitation of the above-mentioned communication distance. However, if a public telecommunication network or a dedicated channel is used, public agreement (protocol) registration must be performed. Procedures such as bookkeeping, its use equipment is also more complicated, and use cost is higher.

One of the objects of the present invention is to provide a system and method for community mutual assistance notification using radio devices. The present invention adopts the frame format of wireless communication, which includes a specific field (field) to control the initiation of information transmission .

The second object of the present invention is to provide a community mutual aid notification system capable of encrypting the content of transmitted information, so as to maintain the security and reliability of communication.

The third object of the present invention is to provide a system and method for community mutual aid notification with relayed message function.

The fourth object of the present invention is to provide a system and method for community mutual aid notification with better spectrum efficiency.

To achieve the above object, the present invention takes the following technical measures:

The community mutual assistance notification system of the present invention has an original information unit composed of a frame format, which contains the transmitter's identification code (ID), message content/status code (message/status) and relay sequence code, through a plurality of wireless devices, In addition, the relay sequence code is accumulated in the relay process until the relay is terminated, and the information unit can be selectively encrypted to ensure the safety and reliability of the communication.

In addition, when the original message reaches its destination, an echo message (echomessage) unit can be delivered, thereby preventing the same message from wasting channel resources.

The present invention takes following concrete structure and method:

According to an aspect of the present invention, there is provided a community mutual notification system utilizing multiple radio devices using the same modulation, format and coding rules on the same frequency channel, characterized in that:

one of the plurality of radio devices is an information source for transmitting information units to transmit information;

The transmitted original information unit includes: an identification code, a code indicating information content/status and a relay sequence code, which are used to generate the relay program and transmit the information;

At least one of the plurality of radio devices is a relay unit. When executing the relay program, use an information unit to spontaneously receive and transmit one machine after another until the relay program is terminated. In the relay program, the relay sequence code is progressively incremented;

one of the plurality of radio devices is a destination device for receiving the information;

Each radio device decides to execute or terminate the relay procedure according to a mutually agreed rule.

According to another aspect of the present invention, there is provided a community mutual notification method using the same modulation, format and coding rules on the same frequency channel using multiple radio devices, comprising the following steps:

a. Generate and transmit an original information unit sent to the destination device by an information source in the radio device, the information unit includes an identification code, an information content/status code and a relay sequence code;

b. A relay program for receiving and transmitting, in which at least one relay machine among multiple radio devices sends out the information automatically one by one with one information unit, wherein the relay sequence code is accumulated successively in the relay program;

c. Terminate the relay program.

Structural features of the present invention are described in detail as follows in conjunction with accompanying drawing and embodiment:

Brief description of the picture

Fig. 1: A schematic diagram of an embodiment of a mutual aid notification system composed of a plurality of radio devices of the present invention;

Figure 2: Schematic diagram of the frame format of the information unit;

Figure 3: Schematic diagram of time control for receiving and retransmitting;

Fig. 4: A schematic diagram of a frame format of an information unit in another embodiment of the present invention.

Figure 5: Schematic diagram of multiple radios illustrating the transmission of reply information elements at the destination to establish a communication narrow path;

Fig. 6: Flowchart of information unit relay transmission through multiple radio devices in the present invention.

Fig. 7: Flow chart of each radio device in the present invention.

Table 1: A schematic diagram of relay transmission of an information unit of the present invention via multiple radio devices.

Detailed ways

As shown in Figure 1, it is a schematic diagram of an embodiment of a mutual notification system composed of a plurality of radio devices of the present invention; wherein, all wireless communication devices select the same channel, modulation format and coding algorithm; first utilize radio device 10 to transmit An information unit, as shown in the figure, the information unit is a formatted frame, which includes a plurality of fields, which are preamble 21, identification code 22, information content/status code 23, and relay sequence code 24 And the first relay location marker (FRLM). When the radio device 10 generates the information unit 2 and before it is transmitted, the radio device identification code 22 and the information content/status code 23 are inserted into the information unit. The information unit also includes a pre-identification code 21 for digital wireless communication. If the radio device 10 is a mobile device (mobile device), the relay sequence code 24 is 0, and the address mark 25 of the first relay person is blank; if the radio device 10 is a fixed device (immobile device), such as the host of a wireless phone, Then the relay sequence code 24 is 1, and the first relay address mark 25 is the transmitter's own address, that is, the address of the radio device 10 .

The first (possibly the nearest) recipient is the wireless device 12, if the relay sequence code 24 of its received information unit is 0, then check the content of the identification code 22, if it is the same as its own identification code, it means that the wireless device 12 is The host of the radio device 10 also indicates that the information unit has arrived at its destination, and displays the information content/status code 23 on the display screen of the radio device 12 at this time. If the identification code 22 is not the identification code of the radio device 12, then add 1 to the relay sequence code 24, and place the address of the radio device 12 at the address mark 25 of the first relay person, such as "the bookstore on Fifth Street", and copy The rest of the original information unit is then transmitted.

The operation of the second and subsequent receivers, that is, the radio device 13 and other subsequent radio devices, adds 1 to the relay sequence code 24, and copies the rest of the information unit 2 to transmit. In other words, during the process of relay transmission of information, the relay sequence code 24 is continuously broken and accumulated, and its value is accumulated by 1 every time it is transmitted again.

Finally, if any of the following situations occurs, the information relay will be terminated. Determine whether the radio device 14 terminates the information relay, first check the content of its identification code 22 after the radio device 14 receives the information unit 2, if it is the known identification code 22 of the radio device 14, then the display screen of the radio device 14 displays the information content/ The status code 23 and the first relay address mark 25, in this case, the information relay is terminated. The second situation is to use the relay sequence code 24 to terminate the information relay. When the relay sequence code 24 reaches a specific critical value (threshold), such as 20, it means that the relay process has reached twenty stations. In order to avoid consuming radio frequency resources, the relay is terminated. The third situation is that if the identification code 22 is the identification code 22 that has been relay-transmitted within a certain period of time before, such as 10 seconds, it means that the radio device 14 has mutually assisted the transmission of the same information, and is retransmitted by the adjacent mutual aid machine , so it is no longer sent.

In the above method, each mutual aid machine decides whether to transmit the information unit 2 again according to the content of the identification code 22, and the host computer, such as the radio device 14, also utilizes to compare whether the identification code 22 of itself is identical with the identification code 22 of the information unit 2, and then Decided to terminate the mutual aid relay.

The identification code 22 is divided into two types: a public identification code and a private identification code. Regarding fire alarm, burglary alarm and regional notification systems, publicly recognized identification codes are used for common use; The identification code 22 can also use a specific algorithm to mix the information content/status code 33 or the relay sequence code 34 into the identification code 22 so that the receiving end can identify its authenticity.

The signal transmission and retransmission of the mutual aid machine adopts an asynchronous method. If necessary, the time interval of retransmission is determined by random rules, so as to reduce the interference caused by the simultaneous retransmission of information units between mutual aid machines.

Fig. 3 shows the schematic diagram of time control of information unit reception and retransmission in the embodiment of the present invention; wherein (a) represents the time schedule of a certain specific radio device continuously transmitting information units, and its second transmission time _t2 is the same as the first transmission time The time interval ΔT ₁ of time t ₁ is a random number within 60±10 seconds; (b) represents the time course of the recipient of the information source adjacent to (a), firstly ΔT ₂ is the time for synchronizing the information source and receiving the information unit 2 The interval is about 1 millisecond (ms), and then the internal calculation interval ΔT ₃ of about 5 milliseconds is reserved, and the interval ΔT ₄ is about 10 seconds, which is reserved for the host to announce the cancellation of retransmission (to be discussed later), and finally, the interval ΔT ₅ is less than about 50 milliseconds, which is the time period for relays, i.e. non-information holders, to retransmit other people's information. The ΔT ₅ used by each machine is randomly designated to prevent different relays from transmitting at the same time when retransmitting, causing mutual interference.

Each mutual aid machine can also receive an identifiable information unit 2 multiple times from other machines. At this time, the conflict problem can be resolved according to the communication rule of conflict detection multiple aggressiveness (CSMA); if a conflict occurs and its information content cannot be identified, then give up The identification and retransmission opportunities. Because the retransmissions of adjacent aircrafts are all provided with random number time intervals, therefore, the information transmitted several times before and after a specific emission source can reach the destination, and the chance of not reaching the destination is extremely small.

The channel used by this system can specify any common channel, such as CH1 of CT1. Because this system uses the communication principle of store and forward to transfer information mutually, each radio device does not need to have the ability to receive and transmit at the same time, and a single channel of the same frequency can perform transmission and reception. Currently widely used wireless devices, such as household wireless phones, are sufficient. If a home wireless phone is used as a mutual aid machine, when there is a general call demand, a blank channel can be selected for use; The communication channel of the mobile phone in order to perform the functions of a general radiotelephone.

Another feature of the present invention is to allow temporary mutual aid machines to join. For example, when a visitor enters the regional mutual assistance area, he can request the security support of the mutual assistance system, especially for vehicle storage. When the visitor's vehicle is parked on the side of the road, the visitor goes to the security unit to register the identification code 22 of the vehicle sub-machine, which may include the algorithm of the identification code 22 . If the vehicle encounters an emergency, such as car theft, the security unit of the mutual assistance system can notify the owner. The security unit can prepare a card reading device for the user of the sub-machine to pre-embed the card with the identification code 22 and the algorithm of the identification code 22 to log into the main unit, so that the sub-machines entering the new area can form a new mutual aid sub-machine.

The above method can be further improved, so that each mutual aid machine may omit some mutual aid work while the communication between the slave machine and the host machine remains unimpeded, which requires adding more fields in the information unit to achieve the above effect. As shown in Figure 4, the information unit 3, in addition to the front identification code 31, the identification code 32, the information content/status code 33, the relay sequence code 34 and the address mark 35 of the first relay person, also includes canceling and retransmitting (retransmit canceling) 36 and the field of tunnel established 37, and the information content/status code 33 includes three columns of public annotation, private message and session key (not shown in the figure). shown), which will be explained in detail later.

As shown in Figure 4, it is a schematic diagram of another embodiment of the present invention, illustrating an information unit with a frame format of a further relay attack field; in the information unit 3 shown in Figure 4, the two mutual aid products can be canceled by using The transmit 36 field terminates the relay. Under certain circumstances, the cancel retransmit 36 field can directly or immediately instruct a relay machine to continue or stop the relay of information. Utilizing the cancel retransmission 36 field to terminate unnecessary handoffs allows the communication system to be used more efficiently.

As shown in FIG. 5 , after receiving the information unit 3 transmitted by the radio device 10 , the host 14 puts a notification marked as known information in the field of cancel retransmission 36 . Once the slave near the main frame 14 receives the character containing the appropriate cancellation and retransmission, the "forward relay" behavior is stopped immediately, which prevents the information unit 3 from being transmitted to unnecessary areas.

Canceling the field of retransmission 36 can not only prevent unnecessary forward relay, but also provide the function of reverse relay. The host 14 inserts the content of the cancel retransmission 36 field to confirm whether the information unit of the slave near the host 14 reaches the host 14 safely. The same confirmation can use the same relay procedure as the previously described forward relay to continue relaying to other slaves. For each mutual aid machine that may save the previous forward relay record and receive the reverse relay information content, it can be easily identified whether it is in the On the forward or reverse relay path, according to whether it is on the forward or reverse path, the mutual aid machine can decide whether to continue copying. Reverse relay. In this way, the reverse relay will eventually reach the original radio and establish a two-way communication mechanism.

The following uses Table 1 to illustrate the situation of each field when the information unit 3 shown in FIG. 5 is transmitted through several mutual aid machines. This example uses the radio device (slave machine) 10 to transmit the information unit 3 to inform the host 14 about its own security status, wherein the information content/status code 33 includes a public code 331 , private information 332 and a temporary key 334 . Except for the temporary key 334, the host machine 14 and the slave machine 10 share the same private key (private key), and the private key will not be transmitted through the radio channel. When the slave machine 10 transmits the information unit 3, the root private key and the temporary key 334 convert the plaintext of the information content/status code 33 into an encrypted message, and the encrypted message is allowed to be transmitted by other mutual aid machines , in this embodiment, the temporary key 334 used is "KEYM".

There are two ways to encrypt the information content/status code 33. For example, first use the private key to encrypt the private information 332 plus the plaintext temporary key 334 into ciphertext, and then combine the plaintext public code 331 and the ciphertext using the temporary key 334 to encrypt. Another way is that the public code 331 is encrypted with the temporary key 334, while the private information 332 and the plaintext temporary key 334 are encrypted with the private key. The purpose of this is to keep the private code 332 decrypted only by the master or the slave, while still being able to transmit the temporary key to the destination and keep the temporary key decrypted only by the master. After encryption, the slave machine transmits a complete frame 3 and requests relay, and at this time, the values in relay sequence code 34 and communication narrow path established 37 are all 0.

After receiving the information unit 3, the nearest relay machine (probably the first station) copies the rest of the original information unit and then transmits it. Since the relay machine itself does not have the private key to crack the information content/status code 33, that is, the non-transmitter’s The main frame, therefore, adds 1 to the relay sequence code 34, and puts its own address "7FOX ST" in the first relay address mark 35, the second and subsequent receivers, i.e. the second station and its subsequent The operation of the mutual aid machine is to add 1 to the relay sequence code 34 in each relay, and to copy the remaining content of the information unit 3 to retransmit. The relay sequence code 34 is continuously accumulated until the host, that is, the eleventh station, receives the information unit 3 . The radio device of the eleventh station (the host computer of the friendly shooter) has the same private key as the transmitter, therefore, after receiving the information unit 3, it can decipher the private information 332 and the temporarily used information content/status code 33 of the encryption. Key 334, the host holds and enters and just can understand the present security state of transmitting sub-unit.

After the host computer receives the information unit 3 sent by the transmitter slave, it will untie the private information 332 and the temporary key n4 in the interval time between ΔT ₄ , (interval time between mutual machine waiting for cancellation and retransmission), and cancel and retransmit 36 In this embodiment, the temporary key of "KEYAA" is inserted into the original information unit 3, and then, the remaining part of the originally encrypted information unit 3 is copied and sent out. The mutual aid machine adjacent to the host computer receives the reply information unit 3' of the host computer in the time interval of _ΔT4 , and uses the reply information unit 3' to take out the temporary key 36, so the mutual aid machine adjacent to the host computer can decode the common code 331 into the original text "111 ", for the confirmation of reception, the public code is a public code system that is recognized by each other, for example, "111" means that the information is accepted without error; and "EEE" means that the current situation is urgent and so on. By comparing the previous receiving identification code 32 with the confirmation code "111", the adjacent radio device determines that the receiving host has safely received the information of its slave. , helping the host to establish a two-way transmission path, perform reverse relay and send its reply information unit 3'.

During the interval ΔT ₄ , other machines adjacent to the host may have received its original information unit 3, but have not relayed it forward or received the information at all. Once the reply message unit 3' is received, all such receivers stop performing forward relay, so that the radio resources in this area are reserved and not wasted. If the relative positions of the relay machines between the slave machine and the main machine have not changed, the reply information unit 3' will relay the relay station by station, that is, return from the tenth station to the ninth station. The eighth station and so on. In this way, each station spontaneously transmits the reply information unit 3', that is, performs a reverse relay, and the information unit 3' will return to somewhere close to the slave via its original communication path. If the sub-machine also has the ability to receive, the contents of the retransmission field 36 of the confirmation reply information unit 3 can be used to ensure that the two-way communication link (communication link) is established. After this, 1 can be inserted in the field of the established 37 of the communication narrow path. Communication narrow paths to indicate bidirectional transmission paths shall be established. If the field value of the communication narrow path has been established 37 is 1, the relay machine not located on the reverse relay path is forced to stop the forward and reverse relays. Judging by the possibility of receiving clear radio signals, only those relays located on the host computer at the geometric position The mutual aid machine between the slave machine participates in the relay. This placement will greatly reduce the number of radios participating in the relay and the channel usage in an area. This method will further restrict the two-way transmission path to become a two-way transmission "narrow path". In the future, when the sub-unit transmits the information unit again, the communication narrow path is likely to be used again.

The temporary key 334 can be different every time, and only the slave machine and the main machine hold the private key at the same time, that is, only the main machine can decipher the encrypted information unit 3 and the temporary key 334. Download the temporary key or pretend to be the transmitter to transmit the information unit. Therefore, the safety and reliability of communication can be guaranteed.

In addition to maintaining the security and reliability of communication, the two-way transmission implemented by the above method can establish a virtual narrow communication path and save communication resources. If the virtual narrow path is not established, the transmission of information may be transmitted in all directions centered on the sub-machine, and transmitted out sequentially through the relay. However, since the host is only in one direction, the relay in other directions becomes meaningless. waste. By establishing a communication narrow path, communication resources can be used more effectively. If the sub-unit sets the communication narrow path established as 1, then the radio devices not on the communication narrow path will not participate in the relay transmission of information, so unnecessary communication resources can be saved.

Using the same identification code 32 is extremely important to the establishment of the communication narrow path, and for successive information transfers, the sub-units only use the same identification code 32 . When the host transmits the reply information unit 3' through the communication narrow path, each mutual machine can compare the records of the information identification code 32 before and after. Therefore, the mutual aid machine can judge its role as forward relay or reverse relay according to its past transmission and reception records.

In some special cases, such as changes in the radio wave environment or different sub-units handle mutual aid transmissions in their adjacent areas, so the busyness of each relay unit varies from time to time. At this time, the receiver may not be able to receive information due to busy recording. Therefore, the virtual communication narrow path may be temporarily unavailable, and the handset may therefore not be able to receive any response. In order to solve this problem, the field of communication narrow path has been established 37 is returned to 0, which means that the support of other mutual aid machines is required to re-establish the communication narrow path.

As shown in Figure 6, it is a flow chart of relay transmission of an information unit in the above-mentioned embodiment of the present invention through a plurality of radio devices. For the information unit 3, the process from the transmitter to being received by the host through the relay mutual assistance can be from Figure 6. The transmitter A generates an information unit 3 in which the information content 33 includes a common code 331 in step S10. Private information 32 and temporary key 334, after step 12, information unit 3 is converted into cipher text, after that, information unit 3 is sent out in step S14, and finally received by radio device X, if radio device X is not transmitter A The host, the value of each field of the information element 3 will determine the response of the radio device X. When the relay sequence code 34 in the information unit 3 is less than a fixed value, for example, a preset critical value, then proceed to step S16 to process the relay sequence code 34, wherein the typical situation is that the value in the relay sequence code 34 is 0, This represents that the radio device X is the first relay of the information unit 3. In addition to adding 1 to the relay sequence code 34, it also includes setting the address of the radio device X in the first relay address field 35, and copying the information unit 3. The data in other fields is sent out again, and in this way, the relay transmission is repeated. When the relay sequence code 34 of the information unit 3 is greater than the current critical value in step S14, the situation shown in step S18 indicates that the information unit 3 has been transmitted by many relays, but has not yet been received by the host. In order to avoid consuming communication resources, The relay is terminated, ie step S20. The content discussed in step S22 is another situation, that is, when the field of the communication narrow path established 37 of the information unit 3 is 1, according to other fields in the information unit 3, such as the identification code 32, the radio device X judges that the communication narrow path has not been established before. When the original information unit of the information unit 3 is transmitted, it means that the radio device X is not on the path of the previous communication of the information unit 3, in other words, the radio device X does not need to transmit the information unit 3 again, so the relay of the information unit 3 Then terminate, that is, step 520 .

If the radio device X is the host of the transmitter A, the ciphertext of the received information unit is broken back into plaintext and a temporary key, that is step S24. Then, the cancel retransmission field 36 of the information unit 3 is set into the temporary key, that is, step S26, as a sign that the information unit 3 has been received by the host. Then, it proceeds to step S28, and transmits the information unit 3 after copying the data of other fields by the radio device X.

An information unit 3 transmitted by radio X is received by a nearby radio Y, the role of radio Y will affect the change of information unit 3 . If the radio device Y is the transmitter A, then proceed to step S30, and set 1 in the communication narrow path establishment field 37 of the information unit 3; After confirming that the original information has safely arrived at the destination, and then transmitting the information including the temporary key, that is step S34, to complete the reverse relay. Such a flow is repeated. If the radio device Y is not the previous relay, the transmission of the information unit 3 that has been inserted into the temporary key is terminated, that is, step S36. This step can be identified by using the identification code 32 of the information unit 3 or comparing other field data.

As shown in Figure 7, the flow chart of each radio device in the present invention, the following further describes the role played by the radio device in this mutual aid machine system and the flow of the radio device receiving different information in different situations and making different responses, wherein, Each radio device can be divided into information originator and relay receiver/receiver according to its different environmental conditions. Look at the owner information unit 3, that is, step S40, and encrypt the information content of the information unit 3 into ciphertext with its own private key, as the information unit of the ciphertext, that is, step S42, so that the information unit cannot be used by other people crack. After transmitting the information unit 3 in step S44, the action of the transmitter is terminated. On the other hand, the relayer/receiver refers to a non-information originator, whose role is either the relayer of the information unit 3 or the receiver. After the relay machine receives the information unit 3, it will identify whether it is the destination (i.e. the host) that the information unit 3 wants to transmit. This is step S50 and S52. This identification is based on whether the relay machine recognizes the ID column of the information unit 3. If step If the result of S52 is "yes", it means that the relay is the host of the transmitter, and then step S54 is performed to solve the original text of the information unit 3 and the temporary key, and then insert the temporary key in the canceling and retransmitting field of the information unit 3. With key, promptly step S56, like this, can stop further forward relay and carry out reverse relay, then, transmit information unit 3 and go out, promptly step S58.

The aforementioned process is aimed at whether the relay machine is the host or not. If the result of step S52 is negative, it means that the relay unit needs to wait for a time interval of _ΔT4 to try to receive the message of canceling retransmission transmitted by the other unit, and the judging process is step S60. If the information received, canceled and retransmitted is received within the time interval of _ΔT4 , it means that the relay information unit has reached its destination, and the forward relay can be canceled. The relay information includes canceling and retransmitting the key, that is, step S62, and reverse relaying. After the replacement process, the information unit 3' is transmitted, step S64. If the result of step S60 is no, it means that the host computer of the relay machine has never received this information unit 3. Then, the relay machine further checks whether the relay sequence code 34 field of the information unit 3 is 0, that is, step S66. This step is a relay The machine understands whether itself is the first recipient of the information unit 3, if the result is yes, then proceed to step S68, the first relay position mark 35 of the information unit 3 is inserted into the position of the relay machine itself, if the step is both If the result of 6 is no, the relay machine will directly add 1 to the relay sequence code 34, i.e. step S70, and copy other fields of the information unit 3 at the same time, and then transmit, i.e. step S64.

Utilize the wireless "consultation" application that can be developed in this system, and the mobile machine can obtain useful public or private information around in the form of consultation. For example, when a car owner who is driving wants to check the location of the car in an unfamiliar place, this application is very practical. A publicly-approved service device can broadcast the device's definite location, and mobiles within its radio service range can determine its literal location if it correctly receives and interprets the information it transmits. For applications that require accuracy within a range of about a hundred feet, this is the most cost-effective positioning service. Wireless consulting can also allow water and electricity companies to use wireless methods to read meters. For example, a meter reading car can drive to the user's vicinity to inquire about the readings of each meter. Using mutual assistance, the meter reading distance can be greatly extended by multiple relays. The consultation function is also very useful for clinics that provide appointment registration or first-in-first-serve restaurants. Clinics or restaurants can broadcast the waiting time or service number. In the nearest clinic or restaurant, any patient or customer can use the mutual aid machine to know the service number status of the clinic or restaurant within the reach of the radio wave or the reach of the radio wave after multiple relays.

Based on the characteristics of the mutual aid machine, the consulting function can be completed in active mode or passive mode. For example, if a car owner who is driving wants to inquire about the current location of his vehicle, he can embed the text "REQ FOR LOC" in the information content/status code 33 field to request a location service. The nearby mutual aid point recognizes this as a positioning request, and no longer transmits the information unit with the relay service according to the usual practice. At this point the broadcast capable receiver replies to this request with the location displayed in the Info Content/Status Code 33 field. According to the general relay rules, different position responders use different response times ΔT ₅ , and the response signals will not always appear at the same time to cause conflicts. The consulting machine can immediately receive and determine the data of a more reliable location, which is called active query service (active query). Another kind of active consulting service is the meter reading business of the hydropower company. The meter reading car can shoot information to request a certain serial number of water and electricity meters to report its readings, and the mutual aid machine can relay the consulting information unit until the person inquired water. The meter transmits, cancels, retransmits and responds to its reading. Using the principle of establishing a two-way communication link, the reading can reach the meter reading vehicle. Passive query services, such as busy hospitals or restaurants, are generally unable to handle a large number of active consultation requests from customers. Therefore, the information required by the public can be placed in column 33 of the information content/status code in plain text. Continuously broadcast, so that mobile machines within the range of its radio waves can be used. These information units can be further relayed by using other mutual aid machines in the vicinity, so that the mobile machine can also use this service in a larger area. In these examples, the mobile will only listen passively and will not be able to transmit and actively request responses.

Compared with the prior art, the present invention has the following effects:

To sum up, using the present invention, the limitation of the communication distance of the radio device is broken through. This system uses a unique shared sending and receiving and termination agreement, and provides the holders of the radio device to form a communication network in a mutual assistance manner according to the relay law, without the need for Relying on the establishment of public telecommunication networks or dedicated radio channels, the purpose of long-distance regional information transmission can be achieved. To use this system, you only need to have the transceiver device permitted by the current laws and regulations to achieve long-distance communication effects. Users even only need to use existing consumer-level communication equipment, and only slightly change the software content of the equipment. , the mutual assistance function proposed by the present invention can be achieved.

On the other hand, through the two-way transmission between the slave and the host, and the encryption of information content, the security and reliability of communication can be guaranteed.

The invention can make wireless communication more convenient and reliable, and has a wide range of applications, such as car anti-theft alarms, children's emergency cell phones, fire alarms, security alarms, garbage collection, notifications of vehicle arrivals, and notifications between floors or units of a building, etc. , can be promoted and used.

The above content is to use the embodiment to illustrate the technical characteristics of the present invention, and is not used to limit the protection scope of the present invention. Even if someone makes a slight change on the basis of the concept of the present invention, it should still belong to the protection scope of the present invention.

Table 1:

Claims (23)

1. A community mutual assistance notification system utilizing multiple radio devices on the same channel using the same modulation, format and coding rules, characterized in that: one of the plurality of radio devices is an information source for transmitting information units to transmit information; The transmitted original information unit includes: an identification code, a code indicating information content/status and a relay sequence code, which are used to generate the relay program and transmit the information; At least one of the plurality of radio devices is a relay unit. When executing the relay program, use an information unit to spontaneously receive and transmit one machine after another until the relay program is terminated. In the relay program, the relay sequence code is progressively incremented; one of the plurality of radio devices is a destination device for receiving the information; Each radio device decides to execute or terminate the relay procedure according to a mutually agreed rule. 2. The system according to claim 1, wherein the relay is terminated when the relay sequence code reaches a critical value. 3. The system according to claim 1, characterized in that the termination of said relay is at said information unit with an identification code known to the recipient. 4. The system according to claim 1, characterized in that the termination of the relay is when the identification code of the information unit has been relay-transmitted by the same relay machine within a certain period of time before. 5. The system according to claim 1, characterized in that at least one relay machine waits for a period of time reserved for other machines to transmit cancel retransmission information elements before retransmitting. 6. The system of claim 1, wherein at least one of said relays waits for a randomly selected period of time before retransmitting to reduce interference caused by simultaneously retransmitting said information units. 7. The system of claim 1, wherein said information unit is encrypted so that only said destination device can decipher it. 8. The system according to claim 1, characterized in that a forward relay and a reverse relay are used to establish a two-way communication link between the information source and the focused device. 9. The system according to claim 1, wherein the information element includes a communication narrow path established field. 10. The system of claim 1, wherein the information element further comprises sending a reply information element from the destination device to the information source to inform that the information has reached the destination device. 11. The system according to claim 1, wherein the information element further includes a field for canceling retransmission to inform the termination of transmission. 12. The system of claim 1, wherein said information source periodically generates and transmits an original information unit. 13. A community mutual aid notification method using multiple radio devices on the same channel using the same modulation, format and coding rules, characterized in that it includes the following steps: a. Generate and transmit an original information unit sent to the destination device by an information source in the radio device, the information unit includes an identification code, an information content/status code and a relay sequence code; b. A relay program for receiving and transmitting, in which at least one relay machine among multiple radio devices spontaneously transmits the information one by one with one information unit, wherein the relay sequence code is accumulated successively in the relay program; c. Terminate the relay procedure; Each radio device decides to execute or terminate the relay procedure according to a mutually agreed rule. 14. The method according to claim 13, wherein the step c includes the following step: judging whether the relay sequence code reaches a critical value again, so as to terminate the relay program. 15. The method according to claim 13, characterized in that the step c includes the following step: judging whether the identification code is an identification code known to the receiver, so as to terminate the relay procedure. 16. The method according to claim 13, characterized in that said step c includes the following step: judging whether the identification code has been transmitted by the same relay machine within a certain period of time, so as to terminate the relay program. 17. The method according to claim 13, wherein said step a includes the step of: encrypting said information so that only said destination device can decipher the encrypted information. 18. The method of claim 17, further comprising the step of: generating and transmitting a reply information element from the destination device to the information source; A public code capable of expressing the meaning of the reply message is deciphered from the reply message unit. 19. The method according to claim 18, further comprising the step of: inserting a communication narrow path established field in the reply information unit, in which a communication connection is established between the information source and the destination device. 20. The method of claim 17, wherein said information is encrypted using a private key shared only by said information source and destination devices. 21. The method according to claim 13, characterized in that at least one relay unit waits for a period of time reserved for other units to transmit a cancel retransmission information element before retransmitting. 22. The method of claim 13, further comprising the steps of: Encrypt the public code using a temporary key; Encrypt private information and temporary keys using a private key; The public code can only be deciphered by the mutual aid machines after the temporary key is deciphered by the target device. 23. The method of claim 13, wherein said information source periodically generates and transmits an original information unit.

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