CN112770281A - Access control method for field of Internet of things of power equipment - Google Patents
Access control method for field of Internet of things of power equipment Download PDFInfo
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- CN112770281A CN112770281A CN202011613431.7A CN202011613431A CN112770281A CN 112770281 A CN112770281 A CN 112770281A CN 202011613431 A CN202011613431 A CN 202011613431A CN 112770281 A CN112770281 A CN 112770281A
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 230000008569 process Effects 0.000 claims abstract description 14
- 230000007958 sleep Effects 0.000 claims description 16
- 238000004891 communication Methods 0.000 claims description 10
- 238000012163 sequencing technique Methods 0.000 claims description 9
- 238000012790 confirmation Methods 0.000 claims description 5
- 230000004622 sleep time Effects 0.000 claims description 5
- 230000002618 waking effect Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 3
- 238000004364 calculation method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
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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
- H04W4/30—Services specially adapted for particular environments, situations or purposes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
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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 discloses an access control method in the field of power equipment Internet of things, which comprises the following steps: firstly, a power equipment Internet of things base station broadcasts access control information to terminal equipment in a network at regular time in a specific channel, wherein the control information comprises hop count, frame number and control information, and meanwhile, the specific channels form a specific frequency point list which is stored in the base station and the terminal equipment; the method provides two access modes, namely a sweep frequency random access mode for discovering out-of-step after the sensor equipment is awakened, and an access mode for directly omitting an access flow according to DRX scheduling, avoids signal interference in the environment, provides a reliable access mode for the power terminal equipment, reduces the power consumption of the sensor in the access process, and can provide reliable connection once the sensor is out-of-step, thereby meeting the requirements of complex environment change and low power consumption of the power equipment internet of things.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to an access control method in the field of power equipment Internet of things.
Background
The power equipment Internet of things is an application of the Internet of things in a smart grid, is a result of development of an information communication technology to a certain stage, effectively integrates communication infrastructure resources and power system infrastructure resources, improves the informatization level of a power system, improves the utilization efficiency of the existing infrastructure of the power system, and provides important technical support for links such as power grid generation, transmission, transformation, distribution and power utilization.
In the power equipment internet of things, sensor terminal equipment sends collected data to a base station, wherein the collected data mainly belong to a sensing layer, currently, collected monitoring data mainly adopt modes such as optical fiber communication, and meanwhile, some services adopt communication modes such as power line carrier or wireless. Because the working environment of the power internet of things equipment is complex, a plurality of equipment need batteries to supply power for long-term work, and because the geographical position and the working environment can not provide external power sources for the equipment, the cost for replacing the batteries is also extremely high. Therefore, a low-power consumption and reliable access mode is a key requirement for continuous operation of the power internet of things equipment.
The access mode signaling interaction of the existing wireless communication technology is complex, and the terminal equipment needs to be accessed again when awakening every time, so that more power resources need to be consumed, and the requirement of low power consumption of the power terminal equipment cannot be met.
Disclosure of Invention
The invention aims to provide an access control method in the field of power equipment internet of things, and aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: an access control method in the field of power equipment Internet of things comprises the following steps:
(1) controlling signal access: firstly, a power equipment Internet of things base station broadcasts access control information to terminal equipment in a network at regular time in a specific channel, wherein the control information comprises hop count, frame number and control information, and the specific channels form a specific frequency point list;
(2) the terminal equipment is awakened: after the sensor terminal equipment is awakened, if the fact that the broadcast message cannot be received is found, scanning is carried out on a specific channel in a frequency point list, weight sequencing is carried out after scanning is finished, then a channel is preferentially selected for access, a base station sends sleep time (DRX period) to the terminal equipment after access, and after the terminal receives the DRX message, the frame number in the current broadcast message is recorded, the terminal enters sleep and is awakened again after set time;
(3) omitting an access flow: after the sensor terminal equipment is awakened, if the fact that the broadcast message can be received is found, the frame number in the broadcast message is compared with the DRX time received last time, if the first frame number received this time-the last frame number before last sleep-the DRX time is equal to an acceptable threshold value, an access process is omitted, sensor service data are directly sent to a base station, next DRX period is waited, and after the DRX is received and the service data are sent, the sensor terminal equipment enters sleep;
(4) and (3) re-accessing the flow: after the sensor terminal equipment is awakened, if the fact that the broadcast message can be received is found, but the first frame number-the last frame number before last sleep-DRX time is not equal to the acceptable threshold value is received, re-access is carried out, the terminal sends a random access request to the base station, and then after a communication address allocated by the base station is received, the terminal gives play to confirmation information, and the access flow is completed.
Preferably, in the step (1), the frequency point list is composed of specific frequency points within 470MHz to 510MHz, and the composed frequency point list is stored in the base station and the terminal device.
Preferably, in step (1), the frequency point of the base station must be in the frequency point list of the terminal.
Preferably, in the step (2), the score calculated by a specific formula according to the signal strength RSSI and the hop count of the received signal is used as a basis for the weight ranking.
Preferably, in step (2), the method for calculating the weight value is as follows: firstly, according to the signal strength (RSSI) obtained in the process of scanning the frequency points, the frequency points in the channel list are divided into four grades, and the corresponding scores are respectively 128, 64, 32 and 16. And then, taking a value obtained by subtracting the hop count in the scanning BCH from the score as a final weight value, and sequencing the weight values of each channel after the scanning is finished.
Preferably, in the step (3), the method for omitting the access procedure is that after the terminal is accessed, the base station sends a DRX cycle (DRXTime) to the terminal to tell that the terminal should wake up again after a corresponding time.
Preferably, in the step (3), the terminal records the frame number of the last broadcast signal (FrameIdx1) before sleeping, and records the frame number of the first broadcast signal (FrameIdx2) after waking up next time.
Preferably, in the step (3), whether re-access is needed is determined by a formula | FrameIdx2-FrameIdx1-DRXTime | < acceptable threshold (Delta), if the formula is established, the access procedure is directly omitted, and if the formula is not established, the terminal sends the random access request to re-perform random access.
Preferably, in the step (4), the terminal device sends the collected sensor service data after completing the access procedure, receives the DRX cycle, and then enters the sleep state.
Compared with the prior art, the invention has the following beneficial effects:
the method provides two access modes, namely a sweep frequency random access mode for discovering out-of-step after the sensor equipment is awakened, and an access mode for directly omitting an access flow according to DRX scheduling, avoids signal interference in the environment, provides a reliable access mode for the power terminal equipment, reduces the power consumption of the sensor in the access process, and can provide reliable connection once the sensor is out-of-step, thereby meeting the requirements of complex environment change and low power consumption of the power equipment internet of things.
Drawings
Fig. 1 is a flow chart of the operation of the device in the power terminal according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An access control method in the field of power equipment Internet of things comprises the following steps:
(1) controlling signal access: firstly, a power equipment Internet of things base station broadcasts access control information to terminal equipment in a network at regular time in a specific channel, wherein the control information comprises hop count, frame number and control information, and the specific channels form a specific frequency point list;
(2) the terminal equipment is awakened: after the sensor terminal equipment is awakened, if the fact that the broadcast message cannot be received is found, scanning is carried out on a specific channel in a frequency point list, weight sequencing is carried out after scanning is finished, then a channel is preferentially selected for access, a base station sends sleep time (DRX period) to the terminal equipment after access, and after the terminal receives the DRX message, the frame number in the current broadcast message is recorded, the terminal enters sleep and is awakened again after set time;
(3) omitting an access flow: after the sensor terminal equipment is awakened, if the fact that the broadcast message can be received is found, the frame number in the broadcast message is compared with the DRX time received last time, if the first frame number received this time-the last frame number before last sleep-the DRX time is equal to an acceptable threshold value, an access process is omitted, sensor service data are directly sent to a base station, next DRX period is waited, and after the DRX is received and the service data are sent, the sensor terminal equipment enters sleep;
(4) and (3) re-accessing the flow: after the sensor terminal equipment is awakened, if the fact that the broadcast message can be received is found, but the first frame number-the last frame number before last sleep-DRX time is not equal to the acceptable threshold value is received, re-access is carried out, the terminal sends a random access request to the base station, and then after a communication address allocated by the base station is received, the terminal gives play to confirmation information, and the access flow is completed.
The first embodiment is as follows:
an access control method in the field of power equipment Internet of things comprises the following steps:
(1) controlling signal access: firstly, a power equipment Internet of things base station broadcasts access control information to terminal equipment in a network at regular time in a specific channel, wherein the control information comprises hop count, frame number and control information, meanwhile, the specific channel forms a specific frequency point list, the frequency point list comprises specific frequency points in 470 MHz-510 MHz, the formed frequency point list is stored in the base station and the terminal equipment, and the frequency point of the base station is required to be in the frequency point list of the terminal, so that the situation that the terminal cannot scan the frequency point of the base station and cannot access the terminal is prevented;
(2) the terminal equipment is awakened: after the sensor terminal equipment is awakened, if the fact that the broadcast message cannot be received is found, scanning is carried out on a specific channel in a frequency point list, weight sequencing is carried out after scanning is finished, then a preferred channel is selected for access, after the access, a base station sends sleep time (DRX period) to the terminal equipment, after the terminal receives the DRX message, a frame number in the current broadcast message is recorded, the terminal enters sleep and is awakened again after set time, the value calculated according to a specific formula by the signal strength RSSI and the hop count of the received signal is used as the basis of the weight sequencing, and the calculation method of the weight value is as follows: firstly, according to the signal strength (RSSI) obtained in the process of scanning the frequency points, the frequency points in the channel list are divided into four grades, and the corresponding scores are respectively 128, 64, 32 and 16. Then, a value obtained by subtracting the hop count in the scanning BCH from the score is used as a final weight value, and after the scanning is finished, the weight values of all channels are sorted, so that the accuracy of weight value calculation can be improved, and the sensor terminal equipment can be conveniently accessed according to sorting preference;
(3) omitting an access flow: after the sensor terminal equipment is awakened, if the fact that the broadcast message can be received is found, the frame number in the broadcast message is compared with the DRX time received last time, if the first frame number received this time-the last frame number before last sleep-the DRX time is equal to an acceptable threshold value, an access process is omitted, sensor service data are directly sent to a base station, next DRX period is waited, and after the DRX is received and the service data are sent, the sensor terminal equipment enters sleep;
(4) and (3) re-accessing the flow: after the sensor terminal equipment is awakened, if the fact that the broadcast message can be received is found, but the first frame number-the last frame number before last sleep-DRX time is not equal to the acceptable threshold value is received, re-access is carried out, the terminal sends a random access request to the base station, and then after a communication address allocated by the base station is received, the terminal gives play to confirmation information, and the access flow is completed.
Example two:
an access control method in the field of power equipment Internet of things comprises the following steps:
(1) controlling signal access: firstly, a power equipment Internet of things base station broadcasts access control information to terminal equipment in a network at regular time in a specific channel, wherein the control information comprises hop count, frame number and control information, meanwhile, the specific channel forms a specific frequency point list, the frequency point list comprises specific frequency points in 470 MHz-510 MHz, the formed frequency point list is stored in the base station and the terminal equipment, and the frequency point of the base station is required to be in the frequency point list of the terminal, so that the situation that the terminal cannot scan the frequency point of the base station and cannot access the terminal is prevented;
(2) the terminal equipment is awakened: after the sensor terminal equipment is awakened, if the fact that the broadcast message cannot be received is found, scanning is carried out on a specific channel in a frequency point list, weight sequencing is carried out after scanning is finished, then a preferred channel is selected for access, after the access, a base station sends sleep time (DRX period) to the terminal equipment, after the terminal receives the DRX message, a frame number in the current broadcast message is recorded, the terminal enters sleep and is awakened again after set time, the value calculated according to a specific formula by the signal strength RSSI and the hop count of the received signal is used as the basis of the weight sequencing, and the calculation method of the weight value is as follows: firstly, according to the signal strength (RSSI) obtained in the process of scanning the frequency points, the frequency points in the channel list are divided into four grades, and the corresponding scores are respectively 128, 64, 32 and 16. Then, a value obtained by subtracting the hop count in the scanning BCH from the score is used as a final weight value, and after the scanning is finished, the weight values of all channels are sorted, so that the accuracy of weight value calculation can be improved, and the sensor terminal equipment can be conveniently accessed according to sorting preference;
(3) omitting an access flow: after waking up, if finding that the broadcast message can be received, the sensor terminal equipment compares the frame number in the broadcast message with the DRX time received last time, if the first frame number received this time-the last frame number before last sleep-DRX time is an acceptable threshold, the sensor terminal equipment omits the access procedure, directly sends sensor traffic data to the base station, waits for the next DRX cycle, enters sleep after receiving DRX and sending the traffic data, and omits the access procedure by the method that the base station sends a DRX cycle (DRXTime) to the terminal after the terminal accesses, tells the terminal to wake up again after the corresponding time, records the frame number of the last broadcast signal (FrameIdx1) before the terminal sleeps, records the frame number of the first broadcast signal (FrameIdx2) after the next wake-up, and records the acceptable threshold (Delta) through the formula of FrameIdx 2-framex 1-DRXTime | after the terminal wakes up again, judging whether re-access is needed, if the formula is established, directly omitting an access flow, and if the formula is not established, sending a random access request by the terminal to re-perform random access;
(4) and (3) re-accessing the flow: after the sensor terminal equipment is awakened, if the fact that the broadcast message can be received is found, but the first frame number-the last frame number before last sleep-DRX time is not equal to an acceptable threshold value, re-access is carried out, the terminal sends a random access request to the base station, then after a communication address allocated by the base station is received, confirmation information is played, an access flow is completed, the terminal equipment sends collected sensor service data after the access flow is completed, receives a DRX period, and then enters a sleep state.
The given access scene is an electric power terminal device and an access node, the acceptable threshold value in the access process is delta 10s, and the specific access steps are as follows:
(1) the power terminal device receives the broadcast message frame sequence number FrameIdx1 last time (538), the received DRX cycle is 300(s), and the power terminal device enters sleep after sending data;
(2) when the power terminal equipment wakes up according to the last received DRX cycle, the frame number of the received broadcast message is FrameIdx 2-833;
(3) FrameIdx2-FrameIdx1-DRXTime | -833 | -538 | -5 | -delta ═ 10, and the terminal can omit the access process according to the above formula;
(4) and the terminal receives the next DRX period after awakening for 5s, sends the acquired service data and then enters a sleep state.
The method provides two access modes, namely a sweep frequency random access mode for discovering out-of-step after the sensor equipment is awakened, and an access mode for directly omitting an access flow according to DRX scheduling, avoids signal interference in the environment, provides a reliable access mode for the power terminal equipment, reduces the power consumption of the sensor in the access process, and can provide reliable connection once the sensor is out-of-step, thereby meeting the requirements of complex environment change and low power consumption of the power equipment internet of things.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. An access control method in the field of power equipment Internet of things is characterized in that: the method comprises the following steps:
(1) controlling signal access: firstly, a power equipment Internet of things base station broadcasts access control information to terminal equipment in a network at regular time in a specific channel, wherein the control information comprises hop count, frame number and control information, and the specific channels form a specific frequency point list;
(2) the terminal equipment is awakened: after the sensor terminal equipment is awakened, if the fact that the broadcast message cannot be received is found, scanning is carried out on a specific channel in a frequency point list, weight sequencing is carried out after scanning is finished, then a channel is preferentially selected for access, a base station sends sleep time (DRX period) to the terminal equipment after access, and after the terminal receives the DRX message, the frame number in the current broadcast message is recorded, the terminal enters sleep and is awakened again after set time;
(3) omitting an access flow: after the sensor terminal equipment is awakened, if the fact that the broadcast message can be received is found, the frame number in the broadcast message is compared with the DRX time received last time, if the first frame number received this time-the last frame number before last sleep-the DRX time is equal to an acceptable threshold value, an access process is omitted, sensor service data are directly sent to a base station, next DRX period is waited, and after the DRX is received and the service data are sent, the sensor terminal equipment enters sleep;
(4) and (3) re-accessing the flow: after the sensor terminal equipment is awakened, if the fact that the broadcast message can be received is found, but the first frame number-the last frame number before last sleep-DRX time is not equal to the acceptable threshold value is received, re-access is carried out, the terminal sends a random access request to the base station, and then after a communication address allocated by the base station is received, the terminal gives play to confirmation information, and the access flow is completed.
2. The power equipment Internet of things field access control method according to claim 1, characterized in that: in the step (1), the frequency point list is composed of specific frequency points within 470 MHz-510 MHz, and the composed frequency point list is stored in the base station and the terminal equipment.
3. The power equipment Internet of things field access control method according to claim 1, characterized in that: in the step (1), the frequency point of the base station must be in the frequency point list of the terminal.
4. The power equipment Internet of things field access control method according to claim 1, characterized in that: in the step (2), the score calculated by the RSSI and the hop count of the received signal according to a specific formula is used as a basis for weight sorting.
5. The power equipment Internet of things field access control method according to claim 1, characterized in that: in the step (2), the method for calculating the weight value is as follows: firstly, according to the signal strength (RSSI) obtained in the process of scanning the frequency points, the frequency points in the channel list are divided into four grades, and the corresponding scores are respectively 128, 64, 32 and 16. And then, taking a value obtained by subtracting the hop count in the scanning BCH from the score as a final weight value, and sequencing the weight values of each channel after the scanning is finished.
6. The power equipment Internet of things field access control method according to claim 1, characterized in that: in the step (3), the method for omitting the access procedure is that after the terminal is accessed, the base station sends a DRX cycle (DRXTime) to the terminal to tell the terminal to wake up again after a corresponding time.
7. The power equipment Internet of things field access control method according to claim 1, characterized in that: in the step (3), the terminal records the frame number of the last broadcast signal (FrameIdx1) before sleeping, and records the frame number of the first broadcast signal (FrameIdx2) after waking up next time.
8. The power equipment Internet of things field access control method according to claim 1, characterized in that: in the step (3), whether re-access is needed is judged through a formula | FrameIdx2-FrameIdx1-DRXTime | < acceptable threshold (Delta), if the formula is true, an access flow is directly omitted, and if the formula is false, the terminal sends a random access request to re-perform random access.
9. The power equipment Internet of things field access control method according to claim 1, characterized in that: in the step (4), the terminal device sends the acquired sensor service data after completing the access process, receives the DRX cycle, and then enters the sleep state.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105282835A (en) * | 2014-06-20 | 2016-01-27 | 苹果公司 | Wlan system with opportunistic transitioning to a low power state for power management |
| KR20170114258A (en) * | 2016-04-01 | 2017-10-13 | 주식회사 케이티 | Methods for performing handover and Apparatuses thereof |
| US20180234919A1 (en) * | 2015-09-25 | 2018-08-16 | Sony Corporation | Wireless telecommunications system |
| CN109151957A (en) * | 2017-06-28 | 2019-01-04 | 珠海市魅族科技有限公司 | Communication means and communication device, the communication equipment of WLAN |
| CN112087790A (en) * | 2019-06-14 | 2020-12-15 | 海信集团有限公司 | Control channel detection method and device applied to Internet of things and storage medium |
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2020
- 2020-12-31 CN CN202011613431.7A patent/CN112770281B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105282835A (en) * | 2014-06-20 | 2016-01-27 | 苹果公司 | Wlan system with opportunistic transitioning to a low power state for power management |
| US20180234919A1 (en) * | 2015-09-25 | 2018-08-16 | Sony Corporation | Wireless telecommunications system |
| KR20170114258A (en) * | 2016-04-01 | 2017-10-13 | 주식회사 케이티 | Methods for performing handover and Apparatuses thereof |
| CN109151957A (en) * | 2017-06-28 | 2019-01-04 | 珠海市魅族科技有限公司 | Communication means and communication device, the communication equipment of WLAN |
| CN112087790A (en) * | 2019-06-14 | 2020-12-15 | 海信集团有限公司 | Control channel detection method and device applied to Internet of things and storage medium |
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