CN104735715B - Wireless Multi-Channel communication device and multi channel real-time communication method - Google Patents

Abstract

The invention discloses a wireless multi-channel communication device and a multi-channel real-time communication method. The device includes: a receiving unit for receiving data on a set wireless channel; a sending unit for sending data on a designated wireless channel Data; the central coordination processing unit is electrically connected with multiple receiving units and sending units respectively, and is used to obtain the data received by multiple receiving units in real time. wireless channel, and transmit the data to be sent on this idle wireless channel to the sending unit. The device and method of the present invention can monitor multiple channel conditions at the same time, obtain accurate channel busy-idle thresholds based on effective reception and continuous sampling, and can judge whether collision or distortion occurs by receiving data packets transmitted by itself, with extremely high Real-time performance can avoid communication delay caused by channel conflict.

Description

Wireless multi-channel communication device and multi-channel real-time communication method

technical field

The invention relates to the technical field of wireless communication, in particular to a wireless multi-channel communication device and a multi-channel real-time communication method.

Background technique

At present, most of the communication devices in the wireless communication network transmit and receive data for a single channel, and there is a competition for channel use rights among the communication nodes in the wireless communication network. When two or more wireless signals are sent at the same time, the communication will be destroyed due to the mutual interference of the signals. There have been a variety of channel competition protocols to solve this problem, but the essence is to organize the nodes that need to send wireless signals at the same time sequentially, which will cause communication delays for some nodes. In situations where real-time wireless communication is required, this delay is unbearable, such as communication between cars driving on the highway through a vehicle-mounted wireless system, and the interaction of driving information through wireless signals is required to provide drivers with more safety guarantees In this case, the delay of hundreds of milliseconds caused by wireless communication conflicts may cause accidents between vehicles. Therefore, a mechanism is needed to ensure that the wireless transceiver can send data at any time. This mechanism can well realize the timely communication of the wireless terminal when a critical situation occurs, and meet the needs of wireless network products with high real-time requirements.

Contents of the invention

In view of this, the object of the present invention is to provide a wireless multi-channel communication device and a multi-channel real-time communication method, which can simultaneously monitor the status of multiple channels and select a channel to send data.

Based on the above purpose, the present invention provides a wireless multi-channel communication device, including: a receiving unit, used to receive data on a set wireless channel; a sending unit, used to send data on a designated wireless channel; a central coordination processing unit, Respectively electrically connected to a plurality of the receiving units and the sending unit, for real-time acquisition of data received by the receiving units, when data needs to be transmitted, according to the current status of each wireless channel, specify the wireless channel used by the sending unit An idle wireless channel, and transmit the data to be sent on the idle wireless channel to the sending unit.

According to an embodiment of the present invention, further, an address selection unit is set between the central coordination processing unit and each receiving unit; the address selection unit is connected to the central coordination processing unit through an address bus and a data bus , the address selection unit is connected to the corresponding receiving unit through a data bus; wherein, the receiving unit is uniformly arranged according to the address and distinguished by address numbers; the central coordination processing unit is connected to the sending unit through a serial communication bus .

According to an embodiment of the present invention, further, the wireless channels set by the multiple receiving units are different, and each receiving unit monitors the corresponding wireless channel, and obtains the received signal strength indicator (RSSI) of the wireless channel in real time value, and send it to the data port; the central coordination processing unit circularly selects the receiving unit, and obtains the RSSI value through the data bus.

According to an embodiment of the present invention, further, each of the receiving units is connected to the central coordination processing unit through an independent status line; when receiving a data packet, the receiving unit obtains the RSSI value of the current wireless channel , and send a trigger signal to the central coordination processing unit through the status line, and send the data packet and the RSSI value of the current wireless channel to a data port; wherein the trigger signal includes: a low level signal; When the central coordination processing unit receives the trigger signal, it determines the receiving unit corresponding to the trigger signal, and obtains the data packet and the RSSI value of the current wireless channel from the receiving unit through a data bus.

According to an embodiment of the present invention, further, the central coordination processing unit judges whether the wireless channel is idle or busy according to the obtained RSSI value; when sending data, the central coordination processing unit selects an idle wireless channel, and The sending unit is set to work on the idle wireless channel, and the data to be sent is transmitted to the sending unit through the serial communication bus.

According to an embodiment of the present invention, further, after the data is sent by the sending unit through the idle channel, the receiving unit working on the same wireless channel as the idle channel receives the sent data data: the central coordination processing unit determines whether the transmitted data received by the receiving unit is the same as the original transmitted data, and if so, determines that the transmitted data is successful.

A multi-channel real-time communication method, comprising: multiple receiving units receive data on set wireless channels, and obtain the data received by the multiple receiving units in real time; The idle wireless channel used by the unit, and transmits the data to be sent on the idle wireless channel to the sending unit; the sending unit sends data on the designated wireless channel.

According to an embodiment of the present invention, further, the receiving units are uniformly arranged according to addresses, and are distinguished by address numbers; the wireless channels set by multiple receiving units are different, and each receiving unit monitors Corresponding to the wireless channel, obtain the RSSI value of the received signal strength indicator of the wireless channel in real time, and send it to the data port; cyclically select the receiving unit, and obtain the RSSI value through the data bus.

According to an embodiment of the present invention, further, when receiving a data packet, the receiving unit obtains the RSSI value of the current wireless channel, and sends a trigger signal through the status line, and combines the data packet and the RSSI value of the current wireless channel The RSSI value is sent to the data port; wherein the trigger signal includes: a low-level signal; when the trigger signal is received, the receiving unit corresponding to the trigger signal is determined, and the data packet is obtained from the receiving unit through the data bus and the RSSI value of the current wireless channel.

According to an embodiment of the present invention, further, judge whether the wireless channel is idle or busy according to the obtained RSSI value; when sending data, select an idle wireless channel, and set the sending unit to work on the idle wireless channel channel, and transmit the data to be sent to the sending unit through the serial communication bus; after the data is sent by the sending unit through the idle channel, the wireless channel working on the same wireless channel as the idle channel The receiving unit receives the sent data; the central coordination processing unit judges whether the sent data received by the receiving unit is the same as the original sent data, and if so, judges that the data sending is successful.

As can be seen from the above, in the wireless multi-channel communication device and the multi-channel real-time communication method of the present invention, multiple receiving units can receive data on different wireless channels at the same time, and select an appropriate channel for data transmission in real time when sending data. sent for reliable wireless communication. It can monitor multiple channel conditions at the same time, obtain accurate channel busy-idle thresholds based on effective reception and continuous sampling, and can judge whether collisions or distortions occur by receiving data packets transmitted by itself. Communication delays caused by collisions.

Description of drawings

Fig. 1 is a schematic diagram of an embodiment of the wireless multi-channel communication device of the present invention;

2 is a schematic diagram of another embodiment of the wireless multi-channel communication device of the present invention;

Fig. 3 is a schematic diagram of a network composed of wireless multi-channel communication devices of the present invention;

FIG. 4 is a flowchart of an embodiment of the multi-channel real-time communication method of the present invention.

Fig. 5 is the working flowchart of receiving data of an embodiment of the multi-channel real-time communication method of the present invention;

Fig. 6 is a working flow chart of processing received data in an embodiment of the multi-channel real-time communication method of the present invention;

FIG. 7 is a flow chart of checking and sending data in an embodiment of the multi-channel real-time communication method of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of an embodiment of a wireless multi-channel communication device of the present invention. As shown in FIG. 1 , receiving units 12, 13, 14 receive data on a set wireless channel. The sending unit 15 sends data on a designated wireless channel. The central coordination processing unit 11 is electrically connected with a plurality of receiving units 12, 13, 14 and sending unit 15 respectively, and obtains the data received by a plurality of receiving units 12, 13, 14 in real time. The state specifies the idle wireless channel used by the sending unit 15, and transmits the data to be sent on the idle wireless channel to the sending unit.

In the wireless multi-channel communication device of the present invention, a plurality of receiving units can receive data on different wireless channels at the same time, and select an appropriate channel for data transmission in real time when sending data, thereby realizing real-time and reliable wireless communication. The channel has a certain frequency bandwidth, and multiple wireless channels can be divided by the working wireless frequency, or different receiving units can use different protocols, such as wifi, bluetooth, CDMA, etc.

Fig. 2 is the schematic diagram of another embodiment of wireless multi-channel communication device of the present invention, as shown in Fig. 2, in central coordination processing unit (or central coordination processor) 21 and each receiving unit (or receiver) 1, Address selection units 1, 2...n are set between 2...n. The address selection units 1, 2...n are connected to the central coordination processing unit 21 through the address bus and the data bus, and the address selection units 1, 2...n are connected to the corresponding receiving units 1, 2...n through the data bus. Receiving units 1, 2...n are uniformly arranged according to addresses, and are distinguished by address numbers. The central coordination processing unit 21 is connected with the transmitting unit (or transmitter) 23 through a serial communication bus.

A plurality of receiving units 1, 2...n can work in different communication channels, are uniformly arranged according to addresses, and are all connected to the central coordination processing unit 21 through an address bus, a data bus and a status line. The central coordination processing unit 21 detects the status of each channel through the receiving units 1, 2...n, and then controls the transmitting unit 23 to work on the designated channel and perform real-time reliable communication.

The wireless channels set by multiple receiving units 1, 2...n are different, and each receiving unit monitors the corresponding wireless channel, obtains the received signal strength indicator RSSI value of the wireless channel in real time, and sends it to the data port. The central coordinating processing unit circularly selects the receiving unit and obtains the RSSI value through the data bus.

In one embodiment, the receiving unit 1 is composed of a microprocessor and a wireless communication unit circuit. The microprocessor has two data ports, one is used to store the received communication content, and the other is used to store the signal strength value of the channel in which it is located. , both data ports have data cache capability and are connected to the data bus of the central coordinating processor.

Each receiving unit 1, 2...n is connected to the central coordination processing unit 21 through an independent status line. When receiving the data packet, the receiving unit obtains the RSSI value of the current wireless channel, and sends a trigger signal to the central coordination processing unit through the status line, and sends the data packet and the RSSI value of the current wireless channel to the data port. Trigger signals include: low-level signals, etc. When the central coordination processing unit 21 receives the trigger signal, it determines the receiving unit corresponding to the trigger signal, and obtains the data packet and the RSSI value of the current wireless channel from the receiving unit through the data bus.

In one embodiment, the central coordination processing unit 21 detects the channel states through the receiving units 1, 2...n, which is initiated by the receiving units 1, 2...n. The microprocessor of each receiving unit always obtains the signal strength value of the channel through the wireless communication unit circuit, and puts it in the signal strength data port, and at the same time judges whether the wireless data is received, and if so, changes the state signal line level Inform the central coordinating processing unit 21 by means of the method, and then the central coordinating processing unit 21 gates the receiving unit to obtain the communication content and channel strength.

The working channel of the transmitting unit 23 changes in real time, and is selected by the central coordination processing unit 21 according to the current idle and busy states of all channels. The central coordination processing unit 21 has two sample data for the signal strength collected by each communication receiver, one group of samples stores the signal strength when the channel does not have a communication event (i.e. receiving data), and one group of samples stores the communication event (i.e. receiving data). data) signal strength at the time of occurrence. The central coordination processing unit 21 constantly updates the signal strength division thresholds of busy or idle channels according to two groups of sample values within a certain period of time.

The wireless multi-channel communication device of the present invention can monitor multiple channel conditions at the same time, has parallel communication processing capabilities, can obtain accurate channel busy-idle thresholds according to effective reception and continuous sampling, and can judge channel conflicts through its own receiver, and has Extremely high real-time performance.

In one embodiment, when sending data, the central coordination processing unit 21 selects an idle wireless channel, and sets the transmitting unit 23 to work in this idle wireless channel, and transmits the data to be sent to the transmitting unit through the serial communication bus twenty three.

After the data is transmitted by the transmitting unit 23 through the idle channel, the receiving unit 1 working on the same wireless channel as the idle channel receives the transmitted data. The central coordination processing unit 21 determines whether the transmitted data received by the receiving unit 1 is the same as the original transmitted data, and if so, determines that the transmitted data is successful.

The communication reliability of the wireless multi-channel communication device of the present invention is judged by whether the receiving unit can receive the data packets transmitted by the device itself. If the wireless signal sent by the transmitting unit is received by the receiving unit in the same working channel, and the data content is exactly the same as the transmission content, it means that there is no error in the transmission process and the data communication is successful. Otherwise, it is considered that the channel has collided or the signal is distorted. Need to resend.

The wireless multi-channel communication device of the present invention can judge whether the data packets transmitted by itself collide or be distorted, and support a large number of wireless terminals in the same wireless network to work at the same time, and is especially suitable for vehicles with a large amount of concurrent data and real-time communication occasions where sexual demands are particularly high.

Fig. 3 is a vehicle-mounted wireless network composed of wireless multi-channel communication devices of the present invention, and wireless multi-channel communication devices 31 and 32 are respectively arranged on different cars. Devices in the system can simultaneously transmit information on other wireless channels, realizing simultaneous communication between any two communication nodes within the same radio coverage area, working in parallel and independently of each other.

In one embodiment, the wireless multi-channel communication device of the present invention has a central coordination processing unit 21, several identical communication receivers 22, several address selection units 29 and a wireless communication transmitting unit 23, and each receiving unit 22 works on different wireless channels.

Each receiving unit 22 is independently connected to the central coordination processing unit 21 through a status line 26, and the status line is controlled by the receiving unit 22 and is usually at a high level. After each receiving unit 22 is powered on, the device is initialized, and it is set to work in the corresponding wireless channel according to its own program, and is in the receiving state. The value of the received signal strength RSSI of the current channel is sampled in real time and placed on the data bus 24. At the same time, it is judged whether there is When a complete data packet arrives, the receiving unit 22 pulls the level of the status line 26 low when it receives a complete data signal from the corresponding wireless channel of other wireless multi-channel communication devices of the same type.

The central coordination processing unit 21 cyclically selects various communication receivers, and obtains the signal strength value on the wireless channel sensed by each receiving unit in real time. Simultaneously, the low level that occurs on the status line 26 can trigger the central coordinating processing unit 21 to enter the interrupt state, and after the central coordinating processor 21 enters the interrupt caused by this kind of situation, it can judge which path receiving unit causes the interrupt, and reads The complete data signal received by the receiving unit and the signal strength value of the current wireless channel are used as one of the basis for judging that the channel is busy next time.

When needing to transmit data, the central coordination processing unit 21 selects an idle channel by judging the busyness and idleness of each channel at the current moment, sets the transmitting unit 23 to work in the idle channel, and transmits the content to be sent through the serial communication bus To the transmitting unit 23, send immediately. After the data transmission is completed, the receiving unit n30 corresponding to the transmission channel receives the data content sent by the transmitting unit 23, and causes the low level of the status line 26 to trigger an interrupt, and the central coordination processing unit 21 judges whether the transmission is successful.

FIG. 4 is a flowchart of an embodiment of the multi-channel real-time communication method of the present invention. As shown in Figure 4:

In step 301, multiple receiving units receive data on a set wireless channel.

Step 302, obtain the data received by multiple receiving units in real time; when the data needs to be transmitted, specify the idle wireless channel used by the transmitting unit according to the current status of each wireless channel, and transmit the data to be sent on this idle wireless channel to the transmitting unit unit.

Step 303, the sending unit sends data on the designated wireless channel.

The receiving units are uniformly arranged according to the address and distinguished by the address number. The wireless channels set by multiple receiving units are different, each receiving unit monitors the corresponding wireless channel, obtains the RSSI value of the received signal strength indicator of the wireless channel in real time, and sends it to the data port; the receiving unit is cyclically selected, through The data bus gets the RSSI value.

Fig. 5 is the working flow diagram of receiving data of an embodiment of the multi-channel real-time communication method of the present invention; As shown in Fig. 5:

Step 401, setting the wireless communication circuit of the receiving unit as the receiving device.

Step 402, acquire the received signal strength indicator RSSI value of the wireless channel in real time, and send it to the data port.

Step 403, judge whether the data packet is received, if yes, go to step 404, if not, go back to step 402.

Step 404, set the value of the status line to M.

Step 405, when receiving the data packet, the receiving unit obtains the RSSI value of the current wireless channel, and sends a trigger signal through the status line, and sends the M byte of the data packet and the RSSI value of the current wireless channel to the data port; the trigger signal includes : Low level signal, etc.

In steps 406, 407, 408, the received data packets are transmitted.

When the trigger signal is received, the receiving unit corresponding to the trigger signal is determined, and the data packet and the RSSI value of the current wireless channel are obtained from the receiving unit through the data bus.

Fig. 6 is the working flowchart of processing the received data of an embodiment of the multi-channel real-time communication method of the present invention, as shown in Fig. 6:

In step 501, the low level on the status line can trigger the interrupt 1 state.

Step 502, after entering the interruption caused by this situation, determine which receiving unit caused the interruption.

Steps 503, 504, 505, select the receiver; read the status bus and the data bus, and store the complete data signal received from the receiving unit and the signal strength value of the current wireless channel as the next time to judge that the channel is busy One of the basis.

Step 506, update the RSSI threshold of the wireless channel.

Fig. 7 is the working flow diagram of the check sending data of an embodiment of the multi-channel real-time communication method of the present invention; As shown in Fig. 7:

In step 601, it is necessary to send data and enter the interrupt 2 state.

Steps 602 and 603, judge whether the wireless channel is idle or busy according to the obtained RSSI value; when sending data, select an idle wireless channel, and set the sending unit to work on this idle wireless channel, and pass the data to be sent through The serial communication bus transmits to the sending unit.

Step 604, send data.

Step 605, after the data is sent by the sending unit through the idle channel, the receiving unit working on the same wireless channel as the idle channel receives the sent data. The central coordination processing unit judges whether the sent data received by the receiving unit is the same as the original sent data, and if so, judges that the data sending is successful.

In the wireless multi-channel communication device and multi-channel real-time communication method provided by the above-mentioned embodiments, multiple receiving units can simultaneously receive data on different wireless channels, and select an appropriate channel for data transmission in real time when sending data, so as to realize reliable wireless communication. communication. It can monitor multiple channel conditions at the same time, obtain accurate channel busy-idle thresholds based on effective reception and continuous sampling, and can judge whether collisions or distortions occur by receiving data packets transmitted by itself. Communication delays caused by collisions.

Those of ordinary skill in the art should understand that: the above descriptions are only specific embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention etc., should be included within the protection scope of the present invention.

Claims (9)

1. a kind of Wireless Multi-Channel communication device, which is characterized in that including：

Receiving unit, for receiving data on the wireless channel of setting；

Transmission unit, for the transmission data on specified wireless channel；

Central co-ordination handles unit, is electrically connected respectively with multiple receiving units and the transmission unit, for obtaining in real time The data that multiple receiving units receive, it is specified described according to the state of current each wireless channel when needing to emit data The idle wireless channel that transmission unit uses, and the data sent will be needed to be transferred to the transmission on idle wireless channel herein Unit；

Wherein, when sending out data, the Central co-ordination handles the wireless channel of unit selection free time and sets the transmission list First wireless channel idle herein that works, it would be desirable to which the data of transmission are transferred to the transmission unit by serial communication bus； After data are sent by the transmission unit by the channel of the free time, it is operated in identical with the channel of free time wireless The receiving unit of channel receives this data sent；Receiving unit connects described in the Central co-ordination processing unit judges Whether the data sent received are identical as originally transmitted data, if it is, judging transmission data success.

2. device as described in claim 1, it is characterised in that：

It is handled in the Central co-ordination and address selection unit is set between unit and each receiving unit；

Described address selecting unit handles unit with the Central co-ordination by address bus and data/address bus and connect, described address Selecting unit is connected by data/address bus with corresponding receiving unit；Wherein, the receiving unit unifies layout by address, passes through Address number is mutually distinguished；

The Central co-ordination processing unit is connect by serial communication bus with the transmission unit.

3. device as claimed in claim 1 or 2, it is characterised in that：

Multiple receiving units are all operated in different wireless channels, and each receiving unit monitors corresponding wireless communication Road, obtains the received signal strength indicator RSSI value of wireless channel in real time, and is sent to data port；

The Central co-ordination processing unit cycle gates the receiving unit, and the RSSI value is obtained by data/address bus.

4. device as claimed in claim 3, it is characterised in that：

Each receiving unit handles unit with the Central co-ordination by independent condition line and connect；

Upon reception of the data packet, the receiving unit obtains the RSSI value of current radio channel, and by the condition line to The Central co-ordination processing unit sends trigger signal, and the RSSI value of the data packet and the current radio channel is sent to Data port；Wherein, the trigger signal includes：Low level signal；

When Central co-ordination processing unit receives the trigger signal, determine that the corresponding reception of the trigger signal is single Member obtains the RSSI value of the data packet and the current radio channel by data/address bus from this receiving unit.

5. device as claimed in claim 4, it is characterised in that：

Whether the Central co-ordination processing unit judges wireless channel in idle or busy condition according to the RSSI value of acquisition.

6. a kind of multi channel real-time communication method, which is characterized in that including：

Multiple receiving units receive data on the wireless channel of setting；

The data that multiple receiving units receive are obtained in real time；When needing to emit data, according to the state of current each wireless channel The idle wireless channel that specified transmission unit uses, and the data sent will be needed to be transferred to transmission on idle wireless channel herein Unit；

Transmission unit transmission data on specified wireless channel；

Wherein, when sending out data, it chooses idle wireless channel and to set the transmission unit work idle wireless herein Channel, it would be desirable to which the data of transmission are transferred to the transmission unit by serial communication bus；

After data are sent by the transmission unit by the channel of the free time, it is operated in identical with the channel of free time The receiving unit of wireless channel receives this data sent；

The data sent that receive of receiving unit described in Central co-ordination processing unit judges whether with originally transmitted data It is identical, if it is, judging transmission data success.

7. method as claimed in claim 6, it is characterised in that：

The receiving unit unifies layout by address, is mutually distinguished by address number；

Multiple receiving units are all operated in different wireless channels, and each receiving unit monitors corresponding wireless communication Road, obtains the received signal strength indicator RSSI value of wireless channel in real time, and is sent to data port；

Cycle gates the receiving unit, and the RSSI value is obtained by data/address bus.

8. the method for claim 7, it is characterised in that：

Upon reception of the data packet, the receiving unit obtains the RSSI value of current radio channel, and is sent and touched by condition line It signals, the RSSI value of the data packet and the current radio channel is sent to data port；Wherein, the trigger signal Including：Low level signal；

When receiving the trigger signal, the corresponding receiving unit of the trigger signal is determined, connect from this by data/address bus Receive the RSSI value that unit obtains the data packet and the current radio channel.

9. method as claimed in claim 8, it is characterised in that：

Judge wireless channel whether in idle or busy condition according to the RSSI value of acquisition.