CN111683400A - Ultra-low power consumption wireless network two-way communication method with short downlink response time delay - Google Patents
Ultra-low power consumption wireless network two-way communication method with short downlink response time delay Download PDFInfo
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- CN111683400A CN111683400A CN202010516315.7A CN202010516315A CN111683400A CN 111683400 A CN111683400 A CN 111683400A CN 202010516315 A CN202010516315 A CN 202010516315A CN 111683400 A CN111683400 A CN 111683400A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
- H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/188—Time-out mechanisms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0248—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal dependent on the time of the day, e.g. according to expected transmission activity
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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
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Abstract
A bidirectional communication method of an ultra-low power consumption wireless network with short downlink response time delay is provided. The invention belongs to an optimization method for realizing bidirectional communication and short downlink response time delay for an ultra-low power consumption wireless network. The invention aims to solve the problem that the ultra-low power consumption of a wireless network and the short downlink response time delay of two-way communication are difficult to simultaneously guarantee in some practical applications, and mainly comprises an awakening mode and a return confirmation part, wherein the awakening mode is that a gateway node continuously sends a control message for a long time so that a wireless node which regularly performs CCA detection receives a downlink control message, the awakening mode can realize two-way communication and guarantee that the downlink response time delay is within a minute level, and a return confirmation mechanism realizes end-to-end confirmation and packet loss retransmission and can guarantee that the downlink control message is reliably transmitted to the wireless node.
Description
Technical Field
The invention belongs to an optimization scheme for realizing bidirectional communication and short downlink response time delay for an ultra-low power consumption wireless network, and relates to a realization method for realizing bidirectional communication and short downlink response time delay on the premise of ensuring the ultra-low power consumption of the wireless network.
Background
With the continuous maturity and development of the wireless technology of the internet of things, the related industry of the internet of things is continuously rising, and the wireless technology plays an increasingly important role in various fields. Although data collection is a core requirement of the internet of things industry, in practical application, downlink control is an indispensable part in different application scenarios. In some practical applications of the internet of things, the wireless nodes are powered by batteries, so that the cost is limited, and the energy of the nodes is very limited. If the batteries are replaced frequently, not only is the network maintenance inconvenient, but also huge cost overhead is brought. In order to avoid a large amount of cost overhead caused by frequent battery replacement, a high network life needs to be achieved without considering the battery replacement, that is, the average energy consumption of the wireless network nodes must be extremely low, and the network needs to be in a low-power consumption sleep state as much as possible. In recent years, some related excellent practices, such as LoRa, Sigfox, NB-IoT and the like, have emerged, and generally focus on key features such as long distance, low cost, low energy consumption and the like. On the premise of ensuring the ultra-low power consumption of the wireless network, the technology generally has no bidirectional communication capability or has long downlink response delay (in the order of hours). The downlink response time delay is defined as the time required from the beginning of the server sending the downlink control command to the end of all the wireless nodes receiving the downlink control command. In order to save energy and prolong the life of wireless networks, most of the multi-hop ad hoc networks such as ZigBee, 6LoWPAN and the like generally adopt low duty cycle technology. Compared with a normally open method, the MAC protocol with low duty ratio obviously improves energy efficiency. However, frequent CCA making necessarily consumes a lot of energy, and it is difficult to ensure ultra-low power consumption of the wireless network. In some practical applications, it is required to ensure that the downlink response time delay is within a minute level on the premise of ensuring the ultra-low power consumption of the wireless network. Therefore, it is necessary to design a method that not only can guarantee the ultra-low power consumption of the wireless network, but also can implement bidirectional communication and has a short downlink response time delay.
Disclosure of Invention
The invention provides a method for realizing bidirectional communication of an ultra-low power consumption wireless network and having short downlink response time delay. The method can achieve the purposes of bidirectional communication and short downlink response time delay on the premise of keeping the ultra-low power consumption and the high reliability of the wireless network. The invention mainly comprises two parts of an awakening mode and a return confirmation. The wake-up mode is a process in which the gateway node continuously transmits a control message for a long time so that the wireless node performing CCA detection every several tens of seconds receives a downlink control message. The wake-up mode can realize bidirectional communication and ensure that the downlink response time delay is within a minute level. The return confirmation mechanism realizes end-to-end confirmation and packet loss retransmission, and can ensure reliable transmission of the downlink control message to the wireless node.
1. The wake-up mode is characterized by: the gateway node needs to continuously send the control message for a long time, so that the wireless node performing CCA detection every tens of seconds can receive the downlink control message. The wireless node is powered by a battery, and the energy is limited. In order to ensure that the node can receive the downlink control command, the node needs to do CCA periodically, but frequent CCA doing will consume a large amount of energy. Therefore, the wireless node is set to perform CCA once every dozens of seconds in the wake-up mode, so that the low average power consumption of the wireless node is guaranteed, and downlink communication can be supported. Meanwhile, the time for sending the control message by the gateway node is slightly longer than the CCA period of the wireless node. The whole control process is as follows:
(1.1) the wireless node performs periodical CCA to listen to the downlink control message, wherein the period is tens of seconds, such as 30 seconds.
(1.2) the gateway node reliably sends the control message to the whole network, and the continuous sending time is the wireless node CCA period plus 1 second, or longer than 1 second, but the normal communication time is affected, so the time does not need to be prolonged.
And (1.3) after receiving the downlink control message, the wireless node judges whether the destination address is the address of the wireless node. And if the destination address is the self address, executing the command carried by the control message.
And (1.4) the wireless node judges whether to need to transmit back confirmation or not according to the confirmation field of the downlink control message. If the return confirmation is needed, the return confirmation is executed, and the specific process is described in the return confirmation part.
2. The backhaul acknowledgement is characterized in that: the return confirmation mechanism realizes end-to-end confirmation and packet loss retransmission, and can ensure reliable transmission of the downlink control message to the wireless node. And after the wireless node receives the downlink control command and judges that the destination address is the self address, judging whether to return confirmation or not according to the confirmation field of the downlink control message. If a return acknowledgement is required, an acknowledgement message is waited and sent for a random period of time. If the gateway node waits for the time-out of the feedback confirmation message, the downlink control message needs to be retransmitted through the awakening mode. When the retransmission times exceed the maximum retransmission times, the control message is discarded and the network administrator is warned.
The specific process is as follows:
(2.1) the wireless node to be acknowledged waits and sends an acknowledgement message at random for a period of time.
And (2.2) if the gateway node receives the confirmation message, ending the downlink communication. And if the gateway node waits for the overtime of the returned confirmation message, retransmitting the downlink control message through the awakening mode.
(2.3) if the gateway node retransmits the downlink control message, repeating the above steps 2.1 and 2.2 until the number of retransmissions reaches the maximum limit.
And (2.4) when the retransmission times exceed the maximum retransmission times, discarding the control message and alarming a network administrator.
The invention uses the awakening mode and the return confirmation mechanism, can realize two-way communication and has shorter downlink response time delay on the premise of ensuring the ultra-low power consumption of the wireless network.
The invention has the beneficial effects that:
1. the wireless node is set to perform CCA once every dozens of seconds in the awakening mode, so that the average wireless node is guaranteed
The power consumption is extremely low and the downlink communication can be supported.
2. Aiming at the problem that in some practical applications, the ultra-low power consumption of a wireless network and the short downlink response time delay of bidirectional communication are difficult to guarantee simultaneously, the invention provides a method which not only can guarantee the ultra-low power consumption of the wireless network, but also can realize the bidirectional communication and the short downlink response time delay. The method has the main advantage that the aim of bidirectional communication with short downlink response time delay can be achieved on the premise of ensuring high reliability and ultralow power consumption of the wireless network.
3. When the retransmission times exceed the maximum retransmission times, the control message is discarded, and an alarm is given to a network administrator, so that a timely warning effect is achieved.
Drawings
Fig. 1 is a schematic diagram of a bidirectional communication method of an ultra-low power consumption wireless network with short downlink response time delay;
FIG. 2 is a flow diagram of an awake mode;
FIG. 3 is a flowchart of acknowledgment feedback;
the first embodiment is as follows:
a wireless network two-way communication method with short downlink response time delay and ultra-low power consumption comprises a wake-up mode and a return confirmation, wherein the wake-up mode sets a wireless node to periodically perform CCA detection, so that the wireless node which periodically performs CCA detection receives a downlink control message, the wireless node receives a downlink control command, judges whether the return confirmation is needed or not according to a confirmation field of the downlink control message, waits for and randomly sends a confirmation message if the return confirmation is needed, and retransmits the downlink control message through the wake-up mode if the gateway node waits for the time-out of the return confirmation message.
The working method of the wake-up mode comprises the following steps:
(1.1) the wireless node monitors a downlink control message by a periodic CCA;
(1.2) the gateway node sends a control message to the whole network;
(1.3) after receiving the downlink control message, the wireless node judges whether the destination address is the address of the wireless node, and if the destination address is the address of the wireless node, the wireless node executes a command carried by the control message;
and (1.4) the wireless node judges whether the backhaul confirmation is needed or not according to the confirmation field of the downlink control message, and if the backhaul confirmation is needed, the backhaul confirmation is executed.
The specific working method of the return confirmation is as follows:
(2.1) the wireless node to be confirmed waits and sends a confirmation message at random for a period of time;
(2.2) if the gateway node receives the confirmation message, finishing the downlink communication; if the gateway node waits for the overtime of the returned confirmation message, retransmitting the downlink control message through the awakening mode;
(2.3) if the gateway node retransmits the downlink control message, repeating the above steps 2.1 and 2.2 until the retransmission times reach the maximum limit;
and (2.4) when the retransmission times exceed the maximum retransmission times, discarding the control message and alarming a network administrator.
The second embodiment is as follows:
based on the first embodiment, the wake-up mode: the invention realizes that the gateway node continuously sends the control message for a long time through the awakening mode, thereby leading the wireless node which performs CCA detection every tens of seconds to be capable of receiving the downlink control message. The wireless node is powered by a battery, and the energy is limited. In order to ensure that the node can receive the downlink control command, the node needs to do CCA periodically, but frequent CCA doing will consume a large amount of energy. Therefore, the wireless node is set to perform CCA once every dozens of seconds in the wake-up mode, so that the low average power consumption of the wireless node is guaranteed, and downlink communication can be supported. Meanwhile, the time for sending the control message by the gateway node is slightly longer than the CCA period of the wireless node. The specific process is as follows:
(1) the wireless node carries out periodical CCA detection, and the aim is to monitor a downlink control message, and the detection period is 30 seconds;
(2) the gateway node reliably issues the control message to the whole network, the continuous sending time is 1 second added to the wireless node CCA detection period, for example, 30 seconds is taken as a period for detection, and the CCA period is added by one second, namely 31 seconds;
(3) and after receiving the downlink control message, the wireless node judges whether the destination address is the own address. And if the destination address is the self address, executing the command carried by the control message.
(4) And the wireless node judges whether to return confirmation or not according to the confirmation field of the downlink control message. If the return confirmation is needed, the return confirmation is executed, and the specific process is described in the return confirmation part.
2. Returning confirmation: the invention realizes end-to-end confirmation and packet loss retransmission by using a return confirmation mechanism, and can ensure that the downlink control message is reliably transmitted to the wireless node. And after the wireless node receives the downlink control command and judges that the destination address is the self address, judging whether to return confirmation or not according to the confirmation field of the downlink control message. If the return confirmation is needed, the confirmation message is waited and sent at random for a period of time, the waiting for random time is to avoid collision, because the return process may have multiple gateway responses, and the direct return or the return with a fixed time length will cause collision and packet loss. If the gateway node waits for the time-out of the feedback confirmation message, the downlink control message needs to be retransmitted through the awakening mode. When the retransmission times exceed the maximum retransmission times, the control message is discarded and the network administrator is warned. The specific process is as follows:
(1) the wireless node to be acknowledged waits and transmits an acknowledgement message at random for a period of time.
(2) And if the gateway node receives the confirmation message, finishing the downlink communication. And if the gateway node waits for the overtime of the returned confirmation message, retransmitting the downlink control message through the awakening mode.
(3) If the gateway node retransmits the downlink control message, the above steps 1 and 2 are repeatedly executed until the number of retransmissions reaches the maximum limit.
(4) When the retransmission times exceed the maximum retransmission times, the control message is discarded and the network administrator is warned.
Claims (4)
1. A bidirectional communication method of an ultra-low power consumption wireless network with short downlink response time delay comprises an awakening mode and a return acknowledgement, and is characterized in that: the awakening mode sets that the wireless node periodically performs CCA detection, the wireless node which performs CCA detection periodically receives the downlink control message, the wireless node receives the downlink control command, judges whether the downlink control message needs to be returned and confirmed or not according to the confirmation field of the downlink control message, if the downlink control message needs to be returned and confirmed, the wireless node waits for and sends the confirmation message at random for a period of time, and if the gateway node waits for the returned and confirmed message to be overtime, the wireless node retransmits the downlink control message through the awakening mode.
2. The bidirectional communication method of the ultra-low power consumption wireless network with short downlink response time delay according to claim 1, wherein the working method of the wake-up mode is as follows:
(1.1) the wireless node monitors a downlink control message by a periodic CCA;
(1.2) the gateway node sends a control message to the whole network;
(1.3) after receiving the downlink control message, the wireless node judges whether the destination address is the address of the wireless node, and if the destination address is the address of the wireless node, the wireless node executes a command carried by the control message;
and (1.4) the wireless node judges whether the backhaul confirmation is needed or not according to the confirmation field of the downlink control message, and if the backhaul confirmation is needed, the backhaul confirmation is executed.
3. The bidirectional communication method of the ultra-low power consumption wireless network with short downlink response time delay according to claim 2, wherein in step 1.1, the wireless node performs periodic CCA detection, and the period for listening to the downlink control message is once every 30 seconds.
4. The method according to claim 1, wherein the backhaul acknowledgement specifically works in a manner that:
(2.1) the wireless node to be confirmed waits and sends a confirmation message at random for a period of time;
(2.2) if the gateway node receives the confirmation message, finishing the downlink communication; if the gateway node waits for the overtime of the returned confirmation message, retransmitting the downlink control message through the awakening mode;
(2.3) if the gateway node retransmits the downlink control message, repeating the above steps 2.1 and 2.2 until the retransmission times reach the maximum limit;
and (2.4) when the retransmission times exceed the maximum retransmission times, discarding the control message and alarming a network administrator.
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