CN106559739B - Lightweight data transmission method suitable for Bluetooth low-power wireless communication system - Google Patents
Lightweight data transmission method suitable for Bluetooth low-power wireless communication system Download PDFInfo
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- CN106559739B CN106559739B CN201610858166.6A CN201610858166A CN106559739B CN 106559739 B CN106559739 B CN 106559739B CN 201610858166 A CN201610858166 A CN 201610858166A CN 106559739 B CN106559739 B CN 106559739B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a lightweight data transmission method suitable for a Bluetooth low-power-consumption wireless communication system. The receiving end only responds to the handshake signal periodically to indicate that the receiving end is normal, so that the transmitting end can keep connection. The receiving end receives the data in sequence, and the receiving end actively requests the transmitting end to retransmit from the frame number when the frame number is found to be discontinuous because the frame number can be guaranteed by the Bluetooth. Then, the transmitting end jumps back to the frame number and continues to transmit continuously. Based on the requirement of low power consumption of the Bluetooth wireless communication system, the invention ensures the reliability and stability of data transmission while improving the data transmission efficiency, and realizes the high-efficiency transmission of light-weight data in the low-power-consumption system.
Description
Technical Field
The invention relates to a data transmission method, in particular to a data transmission method of low-power-consumption wireless communication.
Background
The prior art bluetooth chip provides a frame of response mechanism, which has low requirements on system performance, but has high time delay, resulting in very low data transmission efficiency. Only about 3% of the air interface capacity can be utilized, and a bottleneck exists in large data volume transmission.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a data transmission method which is suitable for the requirement of a Bluetooth low-power consumption system and can ensure the data transmission efficiency by avoiding the defects of the prior art
The technical problem to be solved by the invention can be realized by adopting the following technical scheme:
a lightweight data transmission method suitable for a Bluetooth low-power wireless communication system is provided, the Bluetooth low-power wireless communication system comprises a sending end and a receiving end, and the method is executed according to the following settings:
for a sending end and a receiving end which establish Bluetooth wireless communication connection, the sending end transmits data to the receiving end, the sending end carries out communication in a write command mode, and the receiving end carries out communication in a notification mode;
data is transmitted from a transmitting end to a receiving end in the form of data packets which are divided into packets, and each data packet comprises a basic information data field which reflects the number of the data packets and the sequence number of the data packet;
the transmitting end transmits data including the following steps S1 through S7,
s1, starting to send data, sending data packets according to the sequence number of the data packets in the basic information data domain, and starting the sending end overtime timer;
s2, in transmitting data,
if the provisional response or the retransmission response instruction notification is received, the process proceeds to step S3;
if the data packet loss response instruction notification is received, performing step S4;
after the last data packet is transmitted, if the end packet response instruction notification is received, the process proceeds to step S7;
s3, resetting the timeout timer of the sending terminal, continuing to send the subsequent data packets, and returning to the step S2;
s4, resetting the sending end overtime timer, retransmitting the lost data packet according to the sequence number of the lost data packet recorded in the data packet loss response instruction notification, and returning to the step S2;
s7, judging the end of data transmission, and closing the sending end overtime timer;
the reception of the packet by the receiving end includes the following steps R1 through R8,
r1, receiving the first data packet, starting the receiving end overtime timer;
r2, in receiving a packet,
if a packet is received, go to step R3;
if N packets are received in the accumulation mode, the step R4 is carried out;
if the data packet is judged to be lost, the step R5 is carried out;
if a retransmitted data packet is received, go to step R6;
if the reception of the last packet is completed, proceed to step R8;
r3, resetting the receiving end overtime timer, returning to the step R2;
r4, transmitting a temporary response or retransmission response instruction notice to the transmitting end, clearing the variables of the accumulated received data packets, and returning to the step R2;
r5, judging the serial number of the data packet in the basic data information domain of the lost data packet, returning a data packet loss response instruction notification to the sending end, notifying the sending end of the lost data packet, and returning to the step R2;
r6, transmitting the temporary response or retransmission response instruction notice back to the transmitting end, and returning to the step R2;
and R8, transmitting the end packet response instruction back to the transmitting end.
Specifically, the data packet further includes a control word and data capacity data field, a data content data field, and a check data field.
The present invention provides an unresponsive handling scheme for the sender, and the step S2 further includes,
if the timeout timer of the sender is expired and no temporary response or retransmission response instruction notification is received, go to step S5;
the transmitting end transmits data further including step S5,
and S5, actively disconnecting the transmission link.
The present invention provides an unresponsive handling scheme for the receiving end, and the step R2 further includes,
if the receiving end timeout timer times out, go to step R7;
the reception-end transmission data further includes step R7,
r7. receive state reset.
The present invention provides a special flow for ending the data packet so that the data transmission is smoothly ended, and in step S2,
after the last data packet is sent, starting a sending end overtime timer, shielding the sending end overtime timer, clearing an end overtime unresponsive counter, and performing step S6;
the transmitting end transmits data further including step S6,
s6, the method comprises the following substeps,
s61, if the end packet response command notice is received, the step S7 is executed;
if the sending end overtime timer is overtime and the end packet response instruction notice is not received, retransmitting the last data packet and increasing the end overtime unresponsive counter once;
if the end timeout unresponsive counter is less than 3, returning to step S61;
if the end timeout unresponsive counter is equal to 3, it is determined that the data transmission has failed.
Compared with the prior art, the invention has the technical effects that the lightweight data transmission method suitable for the Bluetooth low-power wireless communication system has the following advantages:
based on the requirement of low power consumption of the Bluetooth wireless communication system, the invention ensures the reliability and stability of data transmission while improving the data transmission efficiency, and realizes the high-efficiency transmission of light-weight data in the low-power-consumption system.
Drawings
FIG. 1 is a basic flow diagram of a preferred embodiment of the invention, a lightweight data transmission method suitable for a Bluetooth low energy wireless communication system;
FIG. 2 is a schematic flow chart of the preferred embodiment at data transmission timeout;
fig. 3 is a schematic processing flow diagram of the preferred embodiment when the end packet is timed out.
Detailed Description
The following is a detailed description of the embodiments with reference to the drawings.
The invention is designed based on the following characteristics of a Bluetooth low-power consumption system:
1. the single frame data transmission reliability is high. The bottom layer of the Bluetooth has basic frequency hopping, Cyclic Redundancy Check (CRC) Check for short, and a retransmission mechanism, although packet loss is possible, the overall reliability can reach more than 95% after connection is established.
2. The frame order can be guaranteed. Because point-to-point connection is adopted, the bottom layer mechanism of the Bluetooth low energy consumption Low energy system of the BLE system for short can ensure that the frame which is sent first reaches the receiving end before the frame which is sent later.
3. The time delay is large. The BLE system adopts periodic data transmission for power saving, and under the condition of parameter configuration with better compatibility, the receiving and transmitting interval delay is generally more than 40 ms.
4. Power consumption is sensitive. BLE systems are typically used for low power devices, such as bracelets, and therefore the protocol complexity cannot be too high to affect device lifetime.
The sending end of the invention continuously sends the data without confirming the sent data. The receiving end only responds to the handshake signal periodically to indicate that the receiving end is normal, so that the transmitting end can keep connection. The receiving end receives the data in sequence, and the receiving end actively requests the transmitting end to retransmit from the frame number when the frame number is found to be discontinuous because the frame number can be guaranteed by the Bluetooth. Then, the transmitting end jumps back to the frame number and continues to transmit continuously. The method is suitable for lightweight data transmission, no complex state machine exists at the transmitting end and the receiving end, and when the BLE system can ensure a certain data transmission success rate and sequence, high-speed and reliable data transmission can be realized with little extra cost.
The invention provides a lightweight data transmission method suitable for a Bluetooth low-power wireless communication system, wherein the Bluetooth low-power wireless communication system comprises a sending end and a receiving end, and the method is executed according to the following settings:
for a sending end and a receiving end which establish Bluetooth wireless communication connection, the sending end transmits data to the receiving end, the sending end carries out communication in a writing command mode, and the receiving end carries out communication in a notification mode.
Data is transmitted from a transmitting end to a receiving end in the form of packets divided into packets, each of which includes a basic information data field CTL reflecting the number of packets and the sequence number of the packet. In particular, the DATA packet further comprises a control word and DATA capacity DATA field ST, a DATA content DATA field DATA, and a check DATA field BCC.
The data packet should conform to the following prescribed format:
description of each data field in the packet:
for example:
when the length of the application data frame exceeds 15 bytes, the sending end should adopt packet sending, and the receiving end should adopt packet receiving.
Then assume that the data to be transmitted (Hex) is 20 bytes as follows:
01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 11 12 13 14 15
at most 15 bytes are transmitted once per packet data, 20 bytes need to be transmitted in a packet mode:
the first package:
the CTL field is 0x 800 x02, which translates to a binary value of 1000000000000010, [ bit:15] =1 indicating that the current packet is the first packet; [ bit: 14-0 ] =2 means that the total number of packets is 2.
The second package:
the field of the CTL data field is 0x 000 x02, the field is converted into 0000000000000010, and [ bit:15] =0, which indicates that the current packet is a continuation packet; [ bit:14~0] =2 indicates that the sequence number of the current packet is 2.
The receiving end receives the two frames of data and then packs the two frames of data into original data.
After the connection between the master and the slave, i.e. the sending end and the receiving end, is established, the master, i.e. the sending end, communicates in a Write Command mode, the slave, i.e. the receiving end, communicates in a Notification mode, and the data communication between the sending end and the receiving end follows the following flow.
As shown in fig. 1, the transmitting-end transmitting data includes the following steps S1 through S7,
s1, starting to send data, sending data packets according to the sequence number of the data packets in the basic information data domain, and starting the sending end overtime timer T1;
s2, in transmitting data,
if the provisional response or the retransmission response instruction notification F1 is received, proceed to step S3;
if the data packet loss response instruction notification F2 is received, go to step S4;
after the last packet is transmitted, if the end packet response instruction notice F3 is received, the process proceeds to step S7;
s3, resetting the timeout timer T1 of the sending terminal, continuing to send the subsequent data packets, and returning to the step S2;
s4, resetting the sending end overtime timer T1, retransmitting the lost data packet according to the sequence number of the lost data packet recorded in the data packet loss response instruction notice F2, and returning to the step S2;
s7, judging the end of data transmission, and closing the sending terminal timeout timer T1;
the reception of the packet by the receiving end includes the following steps R1 through R8,
r1, receiving the first data packet, starting the receiving end overtime timer T2;
r2, in receiving a packet,
if a packet is received, go to step R3;
if N packets are received in the accumulation mode, the step R4 is carried out;
if the data packet is judged to be lost, the step R5 is carried out;
if a retransmitted data packet is received, go to step R6;
if the reception of the last packet is completed, proceed to step R8;
r3, resetting the receiving end timeout timer T2, and returning to the step R2;
r4, transmitting a temporary response or retransmission response command notice F1 to the transmitting terminal, clearing the variables of the accumulated received data packets, and returning to the step R2; the variable of the received data packet is also cleared when the receiving end begins to receive data, and the variable is used for counting the number of the accumulated received data packets;
r5, judging the serial number of the data packet in the basic data information field CTL of the lost data packet, returning a data packet loss response instruction notification F2 to the sending end, notifying the sending end of the lost data packet, and returning to the step R2;
r6, transmitting a temporary response or retransmission response command notice F1 back to the sender, and returning to the step R2;
r8, end packet acknowledgement order notification F3 is returned to the sender.
In a preferred embodiment of the present invention, as shown in fig. 1, the above-described method is embodied as follows,
1) the sending end starts to send data and starts a sending end timeout timer T1 at the same time;
2) the receiving end starts a receiving end overtime timer T2 after receiving the P1, then resets T2 every time new data is received, if the T2 is overtime and still does not receive a new data packet, the receiving end judges that the data reception is failed, and the receiving state is reset;
3) the receiving end needs to reply at least one temporary response or retransmission response command notification F1 within 30 packets received continuously, obviously setting N to 30 here;
4) after receiving the F1, the sending end resets a sending end timeout timer T1;
5) if the receiving end judges that the data has packet loss, replying a data packet loss response instruction to notify F2;
6) the sender resets a sender timeout timer T1 after receiving F2, retransmits the lost packet, and waits for a temporary response or a retransmission response command to notify F1;
7) the receiving end receives the retransmission packet and replies a temporary response or retransmission response instruction to notify F1;
8) the sending end judges whether the response is the response of the retransmission packet after receiving the F1, if the F1 is the response of the retransmission packet, the subsequent packet is continuously sent, otherwise, the T1 is continuously retransmitted after overtime, and if the three times of retransmission fails, the link is judged to be disconnected;
9) for the subsequent packets (such as P7 and P8 in fig. 1) of the lost packet, the receiving end may choose to receive or not receive, and the protocol does not make mandatory requirements;
10) the sending end sends the last data packet, waits for the end packet response instruction to inform F3, and the receiving end replies the end packet response instruction to inform F3 after judging that all data are received;
11) the sender receives the end packet response instruction to notify F3, determines that data transmission is finished, and closes the sender timeout timer T1.
The present invention provides an unresponsive handling scheme for the sender, and the step S2 further includes,
if the sender timeout timer times out T1 and no temporary response or retransmission response command notification is received F1, go to step S5;
the transmitting end transmits data further including step S5,
and S5, actively disconnecting the transmission link.
In the preferred embodiment of the present invention, as shown in fig. 2, that is, the sender continuously sends data, and if no F1 or F2 is received after timeout, the transmission link is actively disconnected.
The present invention provides an unresponsive handling scheme for the receiving end, and the step R2 further includes,
if the receiving end timeout timer T2 times out, go to step R7;
the reception-end transmission data further includes step R7,
r7. receive state reset.
In the preferred embodiment of the present invention, as shown in fig. 2, that is, if the receiving end does not receive data after time out, the receiving state is reset.
The present invention provides a special flow for ending the data packet so that the data transmission is smoothly ended, and in step S2,
after the last data packet is sent, starting a sending end overtime timer T3, shielding the sending end overtime timer T1, clearing an end overtime unresponsive counter, and performing step S6;
the transmitting end transmits data further including step S6,
s6, the method comprises the following substeps,
s61, if the end packet response command notice F3 is received, the step S7 is carried out;
if the transmission end timeout timer T3 times out and the end packet response command notice is not received F3, the last data packet is retransmitted, and the end timeout unresponsive counter is incremented once;
if the end timeout unresponsive counter is less than 3, returning to step S61;
if the end timeout unresponsive counter is equal to 3, it is determined that the data transmission has failed.
A preferred embodiment of the present invention, as shown in fig. 3, is a process,
1) the sender sends the last packet and starts the sending end timeout timer T3, and masks the sender timeout timer T1. Even T1 times out in this scenario will not cause the data transmission to be disconnected;
2) if no response is received after T3 times out, the end packet is retransmitted, and the process is repeated three times, if no response is received, the data transmission is determined to fail.
The instruction notification in the method according to the preferred embodiment of the present invention employs the following settings,
the temporary response or retransmission response instruction notifies F1 example:
example of the data packet loss response instruction notification F2:
end packet reply instruction notification F3 example:
the method of the invention has great expandability. When the power consumption problem of the receiving end is not critical, the receiving end requests the transmitting end for data retransmission started by the frame after finding the frame loss, and can receive subsequent data transmitted by the transmitting end before starting retransmission. And after the lost frame is retransmitted by the transmitting end, the F2 frame is sent again, and the content of the data frame which is received and stored before is skipped, thereby further improving the efficiency.
Claims (4)
1. A lightweight data transmission method suitable for a Bluetooth low-power wireless communication system, wherein the Bluetooth low-power wireless communication system comprises a sending end and a receiving end, and the method is implemented according to the following settings:
for a sending end and a receiving end which establish Bluetooth wireless communication connection, the sending end transmits data to the receiving end, the sending end carries out communication in a write command mode, and the receiving end carries out communication in a notification mode;
data is transmitted from a transmitting end to a receiving end in the form of data packets which are divided into packets, and each data packet comprises a basic information data field which reflects the number of the data packets and the sequence number of the data packet;
the transmitting end transmits data including the following steps S1 through S7,
s1, starting to send data, sequentially sending data packets according to the serial numbers of the data packets in a basic information data domain, and simultaneously starting an overtime timer of a sending end;
s2, in the process of sending the data,
if the provisional response or the retransmission response instruction notification is received, the process proceeds to step S3;
if the data packet loss response instruction notification is received, performing step S4;
if receiving the temporary response or retransmission response instruction notification, judging whether the response is the response of the retransmission packet, if the response is the response of the retransmission packet, continuing to send the subsequent packet, otherwise, continuing to resend after the timeout timer of the sending end times out, and if the three times of resending fails, judging that the link is disconnected;
after the last data packet is sent, starting a sending end overtime timer, shielding the sending end overtime timer, clearing an end overtime unresponsive counter, and performing step S6;
after the last data packet is transmitted, if the end packet response instruction notification is received, the process proceeds to step S7;
s3, resetting the timeout timer of the sending end, continuously sending the subsequent data packet, and returning to the step S2;
s4, resetting the sending end overtime timer, retransmitting the lost data packet according to the sequence number of the lost data packet recorded in the data packet loss response instruction notification, and returning to the step S2;
s6, the method comprises the following steps of,
s61, if receiving the end packet response instruction notification, performing step S7;
if the sending end overtime timer is overtime and the end packet response instruction notice is not received, retransmitting the last data packet and increasing the end overtime unresponsive counter once;
if the end timeout unresponsive counter is less than 3, returning to step S61;
if the end overtime unresponsive counter is equal to 3, judging that the data transmission fails;
s7, judging that data transmission is finished, and closing a sending end overtime timer;
the reception of the packet by the receiving end includes the following steps R1 through R8,
r1, receiving a first data packet, and starting a receiving end timeout timer;
r2. in the process of receiving a data packet,
if a packet is received, go to step R3;
if N packets are received in the accumulation mode, the step R4 is carried out;
if the data packet is judged to be lost, the step R5 is carried out;
if a retransmitted data packet is received, go to step R6;
if the reception of the last packet is completed, proceed to step R8;
r3, resetting the receiving end timeout timer, and returning to the step R2;
r4, returning a temporary response or retransmission response instruction notification to the sending end, clearing the variable of the accumulated data packet, and returning to the step R2;
r5. judging the serial number of the data packet in the basic data information domain of the lost data packet, returning a data packet loss response instruction notification to the sending end, notifying the sending end of the lost data packet, and returning to the step R2;
r6. transmitting a temporary response or retransmission response instruction notice back to the sender, returning to step R2;
r8. returns an end packet reply order notification to the initiator.
2. The method of claim 1, wherein the method comprises:
the data packet further includes a control word and data capacity data field, a data content data field, and a check data field.
3. The method of claim 1, wherein the method comprises:
the step S2 may further include,
if the timeout timer of the sender is expired and no temporary response or retransmission response instruction notification is received, go to step S5;
the transmitting end transmits data further including step S5,
and S5, actively disconnecting the transmission link.
4. The method of claim 1, wherein the method comprises:
said step R2 further includes the step of,
if the receiving end timeout timer times out, go to step R7;
the reception-end transmission data further includes step R7,
r7. receive a status reset.
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