CN114466431A - Air awakening method and wireless communication system applying same - Google Patents
Air awakening method and wireless communication system applying same Download PDFInfo
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- CN114466431A CN114466431A CN202011240705.2A CN202011240705A CN114466431A CN 114466431 A CN114466431 A CN 114466431A CN 202011240705 A CN202011240705 A CN 202011240705A CN 114466431 A CN114466431 A CN 114466431A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004891 communication Methods 0.000 title claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 230000003993 interaction Effects 0.000 claims description 15
- 230000007958 sleep Effects 0.000 claims description 7
- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004590 computer program Methods 0.000 claims description 5
- 108010003272 Hyaluronate lyase Proteins 0.000 claims description 4
- 238000009432 framing Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 230000002618 waking effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 208000019116 sleep disease Diseases 0.000 description 1
- 230000004617 sleep duration Effects 0.000 description 1
- 230000004622 sleep time Effects 0.000 description 1
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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
- 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
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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
The invention relates to an air awakening method and a wireless communication system applying the same, and the key points of the method are as follows: a sending end arranges a wake-up frame, the length of the wake-up frame is more than or equal to two or more CAD detection periods, the wake-up frame comprises a plurality of preamble code segments, and idle time exists between the preamble code segments; the preamble section is composed of a "preamble" and "data" including at least "matching information" and "latency"; the 'waiting time' is the time from the current preamble segment to the end of the wake-up frame; all "preamble" transmission times, combined, can cover the entire CAD detection period. The receiving end receives the lead code in the awakening frame of the invention, which covers the whole CAD detection period, thereby avoiding awakening failure; the addition of the 'waiting time' avoids meaningless waiting time of the node, saves a large amount of power consumption, and therefore the cruising ability of the node can be improved.
Description
Technical Field
The invention relates to an air awakening method and a wireless communication system applying the same.
Background
The LoRa (Long Range radio) technology can realize low power consumption and long-distance transmission. In order to realize low power consumption, the receiving end equipment is in a dormant state at ordinary times, in order to realize data interaction between the equipment, an air awakening technology is needed, and before normal data interaction, the sending end awakens the receiving end.
The basic principle of the air wake-up technology is as follows: adding a long lead code before effective data, periodically waking up and monitoring the network by the wireless node, entering a normal receiving process once the lead code is captured, and immediately sleeping if the lead code is not captured, and waiting for next wake-up. In order to ensure that the wireless node does not miss valid data, the preamble duration should be ensured to be slightly longer than the sleep duration of the wireless node.
As shown in fig. 1, the transmission data includes a Preamble (Preamble), an optional header, a data payload, and the like. The receiving end enters a CAD mode every other sleep time, and searches signals in a frequency band when entering the CAD. If the air has the lead code signal, the receiving end can detect the lead code and switch to a receiving mode to realize the data interaction. Thus, the state of the receiving end includes a periodic sleep state and a CAD state, and a reception mode that may exist.
As shown in fig. 2, in the conventional air wakeup technique, the sleep period (or CAD detection period) is 6 seconds, and is characterized by [ long preamble + short data ].
The advantages are that: the method is simple, has high success rate and is suitable for the broadcast mode.
The disadvantages are that: in a non-broadcast mode, a non-target node is also awakened, so that false awakening is caused; after the node is awakened, the node needs to wait for the end of the preamble, and in an extreme case, the node which is awakened by mistake needs to wait for 6 seconds to find that the node is not the target node. This does not comply with the requirement that the duration of a single transmission does not exceed 1 second (ministry of industry and informatization "catalogue and technical requirements for micropower short-range radio transmission equipment", document 52).
Fig. 3 shows another current over-the-air wake-up technique, which belongs to a modification of the preamble, and the wake-up frame (the wake-up frame referred to herein does not include valid data) is formed by sending the preamble + matching information several times in a cycle, such as the wake-up frame in fig. 3 ═ preamble + matching information ═ 4; the matching information is generally a target node address, the duration of a single lead code + matching information is less than 6 seconds, and the duration of lead code + matching information 4 is greater than 6 seconds.
The advantages are that: due to the fact that the matching information is added, the node of the non-target node is prevented from being awakened by mistake.
The disadvantages are that: due to the existence of the matching information, a part of time of the whole CAD detection period is occupied, and if the target node wakes up in the part of time, the lead code cannot be detected, so that a certain probability of waking up failure is caused. In addition, after the node is awakened, it is also necessary to wait for the end of the preamble phase, and in an extreme case, the waiting time is close to 6 seconds, which causes a large power consumption overhead.
In summary, the technical solutions for waking up in the air in the prior art have the problems of large power consumption and failed wake-up.
Disclosure of Invention
The present application is directed to an over-the-air wake-up method and a wireless communication system using the same, which are used to solve the problems of large power consumption and wake-up failure in the prior art.
In order to achieve the above purpose, the present invention provides an over-the-air wake-up method, which comprises the following steps:
the method comprises the following steps: a sending end arranges a wake-up frame, the length of the wake-up frame is more than or equal to two or more CAD detection periods, and the wake-up frame comprises a plurality of preamble segments; the preamble section is composed of a "preamble" and "data" including at least "matching information" and "latency"; the 'waiting time' is the time from the current preamble segment to the end of the wake-up frame; all the lead code sending time is combined together, so that the whole CAD detection period can be covered;
step two: a sending end performs framing sending; after receiving the preamble segment, the receiving end firstly compares the matching information, and the sleeping is immediately carried out when the matching fails; matching successfully, if the corresponding 'waiting time' is larger than 0, immediately sleeping, awakening after the waiting time is up, and waiting for receiving data; if the waiting time is 0, immediately waiting for receiving data;
step three: the sending/receiving end carries out data interaction;
step four: and after the data interaction is finished, the receiving end sleeps again.
Further, the length of the wake-up frame is greater than or equal to two CAD detection periods.
Further, there is an idle time between preamble segments.
Further, the "data" further includes a "subsequent downlink access rule" for determining a frequency band during data interaction.
Further, the "matching information" is an address, a group address or a broadcast address of the target node.
Further, the sending end arranges the wake-up frame according to wake-up parameters, wherein the wake-up parameters include spreading factor SF, coding rate CR, bandwidth BW, preamble length, CAD detection period and load length of LoRa.
The invention also provides a wireless communication system, which comprises a sending end and a receiving end, wherein the sending end and the receiving end execute the computer program to realize the method.
The lead code in the awakening frame covers the whole CAD detection period, so that awakening failure is avoided; the addition of the 'waiting time' avoids meaningless waiting time of the node, saves a large amount of power consumption, and therefore the cruising ability of the node can be improved.
Drawings
Fig. 1 is a LoRa transmit data structure;
FIG. 2 is a prior art wakeup frame structure;
FIG. 3 is another prior art wake-up frame structure;
fig. 4 is a wake-up frame structure according to an embodiment of the present invention.
Detailed Description
As shown in fig. 4, the main idea of the air wake-up scheme of this embodiment is:
the method comprises the steps that 1, lead codes are fragmented, each lead code fragment comprises a lead code and data, the data comprises matching information and waiting time, the matching information prevents nodes from being awoken by mistake, the waiting time prompts that a wireless node which is successfully matched enters a receiving mode immediately or enters the receiving mode after sleeping for a period of time, and therefore waiting after the wireless node is awoken is avoided.
2, the presence of the above "data" may cause a wake-up failure probability. Therefore, the length of the wake-up frame is two CAD detection periods, although wake-up failure may occur in one CAD detection period, the time gap of the missing lead code is made up through the second CAD detection period, and therefore the wake-up success rate is guaranteed.
In addition, since the absence of the preamble in the previous CAD detection period can be compensated for in the second CAD detection period, idle time can be inserted between preamble segments in each CAD period, as shown in fig. 4.
The specific wake-up process comprises the following steps:
the method comprises the following steps: the sending end arranges a wake-up frame according to the wake-up parameters, the length of the wake-up frame is more than or equal to two CAD detection periods, the wake-up frame comprises a plurality of preamble segments, and idle time exists between the preamble segments.
The wake-up parameters include spreading factor SF of LoRa, coding rate CR, bandwidth BW, preamble length, CAD detection period, load length (data length in preamble segment), and other parameters. The preamble segment is [ preamble + data ]. The arrangement of preamble segments includes:
1, calculating the total times of leading code segments in two continuous CAD detection periods;
2, "data" is "matching information + latency + subsequent downstream access rule (none); the "matching information" may be an address, a group address, or a broadcast address of the target node; the 'waiting time' is the time of normal data interaction after the current preamble segment is finished and the wake-up frame is finished, the 'waiting time' means that the receiving node is told to sleep in the time, and the receiving node can wait for receiving data after waking up after the time is finished; the 'follow-up downlink access rule' tells the receiving terminal to wait for receiving data according to the rule switching parameter after the waiting time is up.
3, in the preamble segment, the time for sending the preamble is longer than the time for sending the data; the latency in the last preamble segment is 0.
4, in order to ensure the awakening success rate, the time for sending all the lead codes is combined together, and the whole CAD detection period can be covered. That is, it must be ensured that the "preamble" of the second period is to cover the "idle + data" part of the first period.
As shown in fig. 4, one wake-up frame includes 5 preamble segments with idle time therebetween, the first 6s period includes 3 preamble segments (not exactly 3), the second 6s period includes 2 preamble segments, and the "preamble" of the second period covers the "idle + data" portion of the first period.
Step two: a sending end performs framing sending; after receiving the wake-up frame (preamble segment), the receiving end firstly compares the matching information, and goes to sleep immediately after the matching fails; matching successfully, if the 'waiting time' is larger than 0, immediately sleeping, awakening after the waiting time is up, and waiting for receiving data; if the "waiting time" is 0, the reception is immediately waited.
Step three: and when the waiting time is up, the transmitting/receiving end switches the frequency band to carry out data interaction.
If the wake-up frame has no 'follow-up downlink access rule' item, the frequency band does not need to be switched, and data interaction is directly carried out; or after the wake-up frame is finished, the sending end sends a command alone to command the receiving end to change the frequency band, and then data interaction is performed.
Step four: and after the data interaction is finished, the receiving end enters a 'dormancy-CAD' mode again.
After the data interaction is finished, the sending end can send a frame of data to inform the receiving end, and the receiving end enters a 'dormancy-CAD' power saving mode after receiving the frame of data; the receiving end sets the time-out time at the same time, and the receiving end directly enters a 'dormancy-CAD' power-saving mode until no new instruction is received.
In other embodiments, the length of one wake-up frame may be three or more CAD detection periods, or may be three or more non-integer periods.
In the above embodiment, the receiving node periodically performs "sleep — CAD" to listen to a certain channel, and may also listen to 2 channels at the same time: the default channel and the working channel ensure that the user can be successfully awakened without losing contact under any condition.
In the above embodiments, the sending end calculates the total number of sending preamble segments and the waiting time of each time according to the wake-up parameters, including spreading factor SF, coding rate CR, bandwidth BW, preamble length, CAD detection period, and load length (data length in the preamble segment), and may manually calculate the parameters of several fixed channels, or may calculate the parameters of any channel according to a certain mathematical model.
The above embodiments are described with LoRa as an example, and as other embodiments, the present invention may be applied to other wireless communication protocols.
In addition, the present invention also provides an embodiment of a wireless communication system, where the wireless communication system includes a sending end and a receiving end, and both the sending end and the receiving end have devices such as a processor and a memory for executing and storing computer programs, and when the computer programs are executed, the method of the above embodiment can be implemented.
The specific structures of the transmitting end and the receiving end, etc., belong to the prior art, and are not described in detail.
Those skilled in the art will appreciate that the present embodiments are well understood to encompass communication systems embodying computer program instructions for performing the methods described herein.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (7)
1. An over-the-air wake-up method, characterized by comprising the steps of:
the method comprises the following steps: a sending end arranges a wake-up frame, the length of the wake-up frame is more than or equal to two or more CAD detection periods, and the wake-up frame comprises a plurality of preamble segments; the preamble section is composed of a "preamble" and "data" including at least "matching information" and "latency"; the 'waiting time' is the time from the current preamble segment to the end of the wake-up frame; all the lead code sending time is combined together, so that the whole CAD detection period can be covered;
step two: a sending end performs framing sending; after receiving the preamble segment, the receiving end firstly compares the matching information, and the sleeping is immediately carried out when the matching fails; matching successfully, if the corresponding 'waiting time' is larger than 0, immediately sleeping, awakening after the waiting time is up, and waiting for receiving data; if the waiting time is 0, immediately waiting for receiving data;
step three: the sending/receiving end carries out data interaction;
step four: and after the data interaction is finished, the receiving end sleeps again.
2. An over-the-air wake-up method according to claim 1, characterized in that the wake-up frame length is equal to or greater than two CAD detection cycles.
3. An over-the-air wake-up method according to claim 1, characterized in that there is an idle time between preamble segments.
4. An over-the-air wake-up method according to claim 1, wherein the "data" further comprises "subsequent downlink access rules" for determining frequency bands at the time of data interaction.
5. An over-the-air wake-up method according to claim 1, characterized in that the "matching information" is an address, a group address or a broadcast address of a target node.
6. An over-the-air wake-up method according to any of the claims 1 to 5, characterized in that the sending end arranges the wake-up frame according to wake-up parameters, which include spreading factor SF, code rate CR, bandwidth BW, preamble length, CAD detection period and load length of LoRa.
7. A wireless communication system comprising a transmitting end and a receiving end, the transmitting end and the receiving end executing computer programs to implement the method of any one of claims 1 to 6.
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| CN202011240705.2A CN114466431A (en) | 2020-11-09 | 2020-11-09 | Air awakening method and wireless communication system applying same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117915442A (en) * | 2023-12-22 | 2024-04-19 | 嘉齐半导体(深圳)有限公司 | Method, equipment and system for reducing false wake-up power consumption |
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| WO2015184625A1 (en) * | 2014-06-05 | 2015-12-10 | 华为技术有限公司 | Asynchronous wakeup method and device |
| CN106937368A (en) * | 2015-12-31 | 2017-07-07 | 深圳友讯达科技股份有限公司 | The secondary wake/sleep method of low power loss communication node, node and system |
| CN110519832A (en) * | 2019-07-16 | 2019-11-29 | 杭州电子科技大学 | A kind of LoRa Star Network low power loss communication method of self-adapting load |
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- 2020-11-09 CN CN202011240705.2A patent/CN114466431A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101557408A (en) * | 2008-04-11 | 2009-10-14 | 中国人民解放军信息工程大学 | Wireless sensor network active mode resting dispatching method |
| CN102396188A (en) * | 2009-04-15 | 2012-03-28 | 皇家飞利浦电子股份有限公司 | Energy efficient transmission in a network |
| WO2015184625A1 (en) * | 2014-06-05 | 2015-12-10 | 华为技术有限公司 | Asynchronous wakeup method and device |
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Cited By (1)
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| CN117915442A (en) * | 2023-12-22 | 2024-04-19 | 嘉齐半导体(深圳)有限公司 | Method, equipment and system for reducing false wake-up power consumption |
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