CN105025585A - Network multiple access method with low power consumption - Google Patents
Network multiple access method with low power consumption Download PDFInfo
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- CN105025585A CN105025585A CN201510445516.1A CN201510445516A CN105025585A CN 105025585 A CN105025585 A CN 105025585A CN 201510445516 A CN201510445516 A CN 201510445516A CN 105025585 A CN105025585 A CN 105025585A
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- 230000005540 biological transmission Effects 0.000 claims abstract description 86
- 238000011144 upstream manufacturing Methods 0.000 claims description 42
- 238000012546 transfer Methods 0.000 claims description 13
- 230000004044 response Effects 0.000 claims description 9
- 230000000284 resting effect Effects 0.000 claims description 8
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 238000002372 labelling Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 8
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Classifications
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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
- H04W74/002—Transmission of channel access control information
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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 a network multiple access method with low power consumption. The method is used in network multiple access data transmission, in which a server communicates with a plurality of terminal equipment via gateway equipment. The method comprises the following steps that a time shaft of data transmission is divided into a plurality of beacon cycles; within a first time interval of the beginning of the current beacon cycle, all terminal equipment enters into an awakening state after being powered up to intercept a notice of the transmission time of an appointment message transmitted to the terminal equipment by gateway equipment; within the time interval after the first time interval of the current beacon cycle, all terminal equipment enters into a dormant state, however, the terminal equipment corresponding to the transmission of the appointment message is awakened on time independently according to the notice of the transmission time of the appointment message. The network multiple access method with low power consumption provided by the invention can effectively solve the problem that multiple terminal equipment is in multiple access into the same network, has the advantages of being small in power consumption, low in cost, high in capacity, high real time and the like, and is applicable to an Internet of Things constructed based on a low speed and long distance transmission technology.
Description
Technical field
The present invention relates to wireless Internet of Things field.More particularly, the present invention relates to a kind of network multiple access method of low-power consumption.
Background technology
Network multiple access method, for server by carrying out the network multiple access data transmission communicated between gateway device with several terminal equipments, wherein gateway device is called downlink transfer to terminal equipment transmission information, and terminal equipment is gateway device transmission information is called uplink.Intermittently communication between gateway device and terminal equipment.Therefore can be divided into communication time and communication time the time.In communication time, both may there is uplink, also may there is downlink transfer.And as long as at communication time, all terminal equipments and gateway device are all be in wake-up states, in order to avoid delay information transmit-receive, but a large amount of electric energy can be consumed like this.
Therefore in order to solve the problem consuming a large amount of electric energy when terminal equipment carries out uplink and downlink transmission, terminal equipment must can carry out dormancy when not having transfer of data.The network multiple access method of existing low-power consumption mainly comprises: Time Synchronizing and time asynchronous scheme based on time division multiple access (TDMA):
Based in the Time Synchronizing of time division multiple access, gateway device gives each terminal equipment distribution regular time section of access consolidated network, terminal equipment can only carry out uplink and downlink transmission in set time section, then dormancy At All Other Times, therefore in consolidated network, number of devices is more, the time interval of individual equipment twice transmission information is longer, can bring very large transmission delay.
Time asynchronous scheme has two kinds of different processing modes at present, wherein a kind of time asynchronous scheme allows terminal equipment to send uplink information in real time by the demand of oneself, but cannot in low-power consumption situation real-time reception downlink information, be therefore mainly applicable to the network of terminal equipment active upload data; Another kind of time asynchronous scheme then allows terminal equipment real-time reception downlink information, but the necessary long-time busy channel of gateway device, to such an extent as to terminal equipment does not have enough channels to send uplink information, cause bandwidth serious waste, communication efficiency is low, mainly be applicable to terminal equipment and receive the network of downlink command, therefore time asynchronous scheme can not realize the network condition that not only needs information upload but also need to receive downlink information.
Therefore, invention one neither consumes too many electric energy, can ensure that again terminal equipment carries out transfer of data in time, rapidly, and the network multiple access method that simultaneously terminal equipment can receive the response message that gateway sends in time seems very necessary.
Summary of the invention
An object of the present invention is to solve at least the problems referred to above and defect, and the advantage will illustrated after providing.
A further object of the invention is by setting out multiple period to a beacon period, gateway and terminal equipment carry out uplink and downlink information transmission within the different periods, meet different transmission demands, keeping dormancy when not carrying out information transmission, achieving the object of low power consumption transmission information.
A further object of the invention is the quantity according to upstream message and downstream message in reservation message in each beacon period, the reservation up period dividing different duration for each beacon period and the uplink and downlink network bandwidth resources distribution of preengaging in the beacon period of descending period dynamic adjustments.
A further object of the invention is the response that gateway contains the uplink information to terminal equipment multiple beacon period in transmission response message, to reduce the traffic, avoids waste bandwidth.
Part is embodied by explanation below by other advantage of the present invention, target and feature, part also will by research and practice of the present invention by those skilled in the art is understood.
The invention provides a kind of network multiple access method of low-power consumption, for server by carrying out the network multiple access data transmission communicated between gateway device with several terminal equipments, comprising:
The time shaft of transfer of data is divided into multiple beacon period;
Within first period that current beacon cycle starts, wake-up states is entered after all terminal equipments power up, to intercept the notice in the transmission time of the reservation message that described gateway device sends to terminal equipment, the notice in the transmission time of described reservation message is by described Servers installed;
In period after first period of current beacon cycle, all terminal equipments enter resting state, but the terminal equipment corresponding to the transmission of reservation message can be waken up according to the notice in the transmission time of described reservation message, to realize the transmission of reservation message independently of one another on time.
Preferably, the division methods of described multiple beacon period is the beacon period being divided into continuous print, fixing duration, and the Period Length that arranges of wherein said fixing duration becomes negative correlation with network transfer speeds.
Preferably, described first period is beacon periods, also includes the following period thereafter:
Preengage the up period, within this period, transmit in reservation message, be sent to server from terminal equipment upstream message;
Preengage the descending period, within this period, transmit in reservation message, be sent to terminal equipment from server downstream message.
Preferably, the following period is also included after described first period:
The free competition period, within this period, transmit in non-reservation message, be sent to server from terminal equipment upstream message; And
Within this period, enter after the terminal equipment that will send upstream message in the terminal equipment of resting state is powered and enter wake-up states, to realize the transmission of upstream message.
Preferably, determined the rank of all upstream messages being sent to server from terminal equipment according to significance level by described server, the upstream message that rank is high is arranged in reservation message, and the low upstream message of rank is arranged in non-reservation message, and all downstream messages are all arranged in reservation message.
Preferably, described server is according to the quantity of upstream message and downstream message in reservation message in each beacon period, for each beacon period divides reservation up period and the reservation descending period of different duration, and at beacon periods, division information is sent to terminal equipment.
Preferably, each beacon period is divided into n and waits the time trifle of duration, and the duration of time trifle is greater than and is issued to terminal equipment in beacon periods start message from gateway device and listens to required duration; And
Beacon periods, preengage the up period, preengage the descending period and the free competition period is the integral multiple that duration is time trifle.
Preferably, in the free competition period, the concrete transmitting time trifle of upstream message freely determined by the terminal equipment corresponding to the transmission of the upstream message in all non-reservation message, but need the transmission signal of intercepting other terminal equipment before sending, if transmission signal can not be listened to, then carry out the transmission of upstream message immediately, if transmission signal can be listened to, the then time trifle of free backward delay transmission, and then carry out intercepting to determine whether to send, until current beacon cycle terminates.
Preferably, described server is according to the character of upstream message in the beacon period, upstream message to be answered is replied, and the beacon periods in X beacon period after this beacon period, to all binding response messages that should send in this beacon period to terminal equipment, wherein X is integer.
Preferably, in beacon periods, also send the timestamp of labeling gateway equipment current time, after terminal equipment receives this timestamp, the adjustment time of terminal equipment and the time synchronized of Network Management Equipment.
The invention provides a kind of network multiple access method of low-power consumption, the time shaft of transfer of data is divided into multiple beacon period, within first period that current beacon cycle starts, wake-up states is entered after all terminal equipments power up, to intercept the notice in the transmission time of the reservation message that described gateway device sends to terminal equipment, the notice in the transmission time of described reservation message is by described Servers installed, in period after first period of current beacon cycle, all terminal equipments enter resting state, but the terminal equipment corresponding to the transmission of reservation message can be waken up independently of one another according to the notice in the transmission time of described reservation message on time, low cost can be built thus, low-power consumption, low delay, on a large scale, high efficiency network.
Accompanying drawing explanation
Fig. 1: in the present invention, terminal equipment is received information and sends the time diagram of information;
Fig. 2: the workflow block diagram of terminal equipment in the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail, can implement according to this with reference to specification word to make those skilled in the art.
Should be appreciated that used hereinly such as " to have ", other element one or more do not allotted in " comprising " and " comprising " term or the existence of its combination or interpolation.
Multiple terminal equipment utilizes multiple access method described in the invention, wirelessly accesses same gateway device, and gateway device accesses application server by modes such as Ethernet/GPRS/3G again.The data that terminal equipment needs (timing or by specific events trigger) as required to be collected by equipment pass to application server, then first must send the data to gateway device, be transmitted to application server by gateway device.Application server then needs the data to receiving to reply, and (timing or by specific events trigger) transmitting order to lower levels, to terminal equipment, also all first must send to gateway device, then be transmitted to terminal equipment by gateway device as required.
The invention provides a kind of network multiple access method of low-power consumption, for server by carrying out the network multiple access data transmission communicated between gateway device with several terminal equipments, comprising:
The time shaft of transfer of data is divided into multiple beacon period;
Within first period that current beacon cycle starts, wake-up states is entered after all terminal equipments power up, to intercept the notice in the transmission time of the reservation message that described gateway device sends to terminal equipment, the notice in the transmission time of described reservation message is by described Servers installed;
In period after first period of current beacon cycle, all terminal equipments enter resting state, but the terminal equipment corresponding to the transmission of reservation message can be waken up according to the notice in the transmission time of described reservation message, to realize the transmission of reservation message independently of one another on time.
The division methods of described multiple beacon period is the beacon period being divided into continuous print, fixing duration, the Period Length that arranges of wherein said fixing duration becomes negative correlation with network transfer speeds, namely, if network transfer speeds is faster, then the Period Length of a beacon period is shorter, if network transfer speeds is slower, then the Period Length of a beacon period is longer.
Described first period is beacon periods, also includes the following period thereafter:
Preengage the up period, within this period, transmit in reservation message, be sent to server from terminal equipment upstream message;
Preengage the descending period, within this period, transmit in reservation message, be sent to terminal equipment from server downstream message.
The following period is also included after described first period:
The free competition period, within this period, transmit in non-reservation message, be sent to server from terminal equipment upstream message; And
Within this period, enter after the terminal equipment that will send upstream message in the terminal equipment of resting state is powered and enter wake-up states, to realize the transmission of upstream message.
Determined the rank of all upstream messages being sent to server from terminal equipment according to significance level by described server, the upstream message that rank is high is arranged in reservation message, and the low upstream message of rank is arranged in non-reservation message, and all downstream messages are all arranged in reservation message.
Division information, according to the quantity of upstream message and downstream message in reservation message in each beacon period, for each beacon period divides reservation up period and the reservation descending period of different duration, and is sent to terminal equipment at beacon periods by described server.
Each beacon period is divided into n and waits the time trifle of duration, and the duration of time trifle is greater than and is issued to terminal equipment in beacon periods start message from gateway device and listens to required duration; And
Beacon periods, preengage the up period, preengage the descending period and the free competition period is the integral multiple that duration is time trifle.
In the free competition period, the concrete transmitting time trifle of upstream message freely determined by the terminal equipment corresponding to the transmission of the upstream message in all non-reservation message, but need the transmission signal of intercepting other terminal equipment before sending, if transmission signal can not be listened to, then carry out the transmission of upstream message immediately, if transmission signal can be listened to, then the time trifle of free backward delay transmission, and then carry out intercepting to determine whether to send, until current beacon cycle terminates.
Described server is according to the character of upstream message in the beacon period, upstream message to be answered is replied, and the beacon periods in X beacon period after this beacon period, to all binding response messages that should send in this beacon period to terminal equipment, wherein X is integer.
In beacon periods, also send the timestamp of labeling gateway equipment current time, after terminal equipment receives this timestamp, the adjustment time of terminal equipment and the time synchronized of Network Management Equipment.
In order to meet the real-time of uplink and downlink information transmission, time shaft is divided into continuous print beacon period by the inventive method, and each beacon period length is consistent, but can regulate according to traffic rate.Such as, when adopting 10Kbps traffic rate, 2s can be used as beacon period length.Gateway device periodically sends beacon frame, to identify different beacon periods.Contain gateway device current time stamp in beacon frame, terminal equipment, receiving beacon frame and after parsing timestamp, can revising the time of oneself, keeps and gateway synchronization.The time span that described beacon frame comprises beacon periods described in current beacon cycle, preengages the up period, preengages descending period and free competition period section, terminal equipment carries out time synchronized according to described timestamp.
In order to allow the terminal equipment low-power consumption multiple access access consolidated network with multiple uplink and downlink transmission demand, each beacon period is divided into four transmission periods by the inventive method: beacon periods, preengage the up period, preengage descending period and free competition period.The regular hour is needed owing to send/receive beacon frame between gateway device and terminal equipment, time synchronization error can be caused, therefore each beacon period is divided into multiple trifle by the inventive method further, the time span of every trifle is equal, and need be greater than the error detecting beacon frame start time position.Such as under 10Kbps speed, each beacon period length is 2s, and detecting beacon frame start time position error is 10ms, then can be divided into 128 trifles beacon period, every trifle 15.625ms.Define the division of current beacon cycle transmission period in the beacon frame that gateway device sends, also namely each transmission period occupies how many trifles.
As shown in Figure 1, in the n-th beacon period, above-mentioned 4 transmission periods occupy 10,4,14,100 trifles respectively, and sum of adding up equals 128, and within (n+1)th beacon period, above-mentioned 4 transmission periods then occupy 10,0,8,110 trifles respectively.The object dividing the different transmission period is to meet different transmission demands: in the reservation up period, and terminal equipment can conflict free transmission uplink information, is applicable to the application of high real-time requirement; In the reservation descending period, terminal equipment can real-time reception downlink information; In the free competition period, then may there is conflict in terminal equipment, exists and send failed probability, is applicable to send general data.And the accounting of each transmission period can adjust flexibly according to the terminal equipment of access network, thus the uplink and downlink network bandwidth resources in the beacon period of dynamic adjustments is distributed.In Time Synchronizing based on time division multiple access (TDMA), terminal equipment at the appointed time can only carry out uplink and downlink transmission in sheet, and when number of devices is larger, the timeslice a good distance off that individual equipment obtains, can bring very large delay; The time asynchronous scheme of similar loraWAN agreement allows terminal equipment to send uplink information as required, but there is failed probability, and cannot in low-power consumption situation real-time reception downlink information; The time asynchronous scheme of similar ContikiMAC agreement then allows terminal equipment real-time reception downlink information, but gateway device must send lead code by long-time busy channel, and cause bandwidth serious waste, communication efficiency is low.
Gateway device sends outside beacon frame in beacon periods, also sends binding acknowledgement frame, replys for the uplink information sent received terminal equipment.Each terminal equipment sends a uplink information at most within a beacon period, the binding acknowledgement frame that gateway device sends in the n-th+x beacon period, be the response to the uplink information that received terminal equipment sends within the n-th beacon period, wherein x is an adjustable system parameters.The response to multiple uplink information may be comprised in a binding acknowledgement frame, to reduce the traffic, avoid waste bandwidth.As shown in Figure 1, if arrange x=1, then the binding acknowledgement frame sent in (n+1)th beacon period is the response to the uplink information (An, Bn, Cn) that received terminal equipment sends within the n-th beacon period.If arrange larger x, then can process and set binding acknowledgement frame content by server according to the uplink information received, and between gateway and server, there is the situation of certain communication delay.
After gateway device sends binding acknowledgement frame in beacon periods, also send reserve transmission set of time frame, send uplink information or reception downlink information for notification terminal equipment at the time point of specifying.As shown in Figure 1, comprise the up and reservation downgoing time of reservation in the reserve transmission set of time frame that gateway device sent in the n-th beacon period, in the reserve transmission set of time frame that (n+1)th beacon period sends, then only comprise reservation downgoing time.Suppose that arranging reservation upstream time point in the reserve transmission set of time frame that gateway device sent in the n-th beacon period is A:n:1, then terminal equipment A knows after resolving that oneself should start to send reservation uplink information in the 11st of this beacon period trifle, wherein 10=10 (beacon period length)+1 (reservation upstream time point), other terminal equipment then keeps mourning in silence in the whole reservation up period, therefore can not produce up conflict, avoid uplink information and lose.Similar, arranging reservation downgoing time point in the reserve transmission set of time frame that n-th beacon period sent is B:1 A:5 C:10, then terminal equipment B knows after resolving that oneself should start to receive reservation downlink information in the 15th of a current beacon cycle trifle, wherein 15=10 (beacon period length)+4 (preengaging up Period Length)+1 (reservation downgoing time point), terminal equipment A knows after resolving that oneself should start to receive reservation downlink information the 19th trifle, wherein 19=10 (beacon period length)+4 (preengaging up Period Length)+5 (reservation downgoing time point), and terminal equipment C knows after resolving that oneself should start to receive reservation downlink information the 24th trifle, wherein 24=10 (beacon period length)+4 (preengaging up Period Length)+10 (reservation downgoing time point).Gateway device adopts identical computational methods, starts to send corresponding downlink information at corresponding time point.In this manner, terminal equipment on the one hand can receive downlink information timely, on the other hand can dormancy when preengaging in the descending period and not preengaging downlink information, thus reduces power consumption.
In the free competition period, all terminal equipments all can send uplink information, for avoiding conflict, need to carry out collision detection in transmission, whether first perception periphery has the node sending uplink information, if possible produces conflict, then random back a period of time attempts sending again.As shown in Figure 1, in (n+1)th beacon period, terminal equipment C carries out collision detection before trial sends uplink information, find sending uplink information Bn+1 with terminal equipment B, therefore after making a concession a period of time at random, again carry out collision detection, found that not conflict, just send uplink information Cn+1.
Fig. 2 is the general work flow process of terminal equipment.Namely enter transmission state after terminal equipment powers up, listen for beacons frame, if do not receive beacon frame, then dormancy a period of time, reenter transmission state.Terminal equipment obtains after beacon frame, resolves timestamp wherein, according to timestamp oneself time synchronous, and obtains the transmission mode setting of current period.Then binding acknowledgement frame is received, and reserve transmission set of time frame, and arrange according to the transmission time, according to described mode above, send reservation uplink information at corresponding time point or receive reservation downlink information, and send uplink information, enter resting state At All Other Times.After current beacon cycle terminates, if need synchronous, or there is uplink information to be sent, or need to carry out subscription information transmission, then enter transmission state, otherwise proceed dormancy.This working method, can effectively reduce terminal equipment power consumption.
Although embodiment of the present invention are open as above, it is not restricted to listed in specification and execution mode utilization.It can be applied to various applicable the field of the invention completely.For those skilled in the art, can easily realize other amendment.Therefore do not deviating under the universal that claim and equivalency range limit, the present invention is not limited to specific details and illustrates here and the legend described.
Claims (10)
1. a network multiple access method for low-power consumption, for server by carrying out the network multiple access data transmission communicated between gateway device with several terminal equipments, is characterized in that, comprise:
The time shaft of transfer of data is divided into multiple beacon period;
Within first period that current beacon cycle starts, wake-up states is entered after all terminal equipments power up, to intercept the notice in the transmission time of the reservation message that described gateway device sends to terminal equipment, the notice in the transmission time of described reservation message is by described Servers installed;
In period after first period of current beacon cycle, all terminal equipments enter resting state, but the terminal equipment corresponding to the transmission of reservation message can be waken up according to the notice in the transmission time of described reservation message, to realize the transmission of reservation message independently of one another on time.
2. the network multiple access method of low-power consumption as claimed in claim 1, it is characterized in that, the division methods of described multiple beacon period is the beacon period being divided into continuous print, fixing duration, and the Period Length that arranges of wherein said fixing duration becomes negative correlation with network transfer speeds.
3. the network multiple access method of low-power consumption as claimed in claim 1, it is characterized in that, described first period is beacon periods, also includes the following period thereafter:
Preengage the up period, within this period, transmit in reservation message, be sent to server from terminal equipment upstream message;
Preengage the descending period, within this period, transmit in reservation message, be sent to terminal equipment from server downstream message.
4. the network multiple access method of low-power consumption as claimed in claim 3, is characterized in that, also include the following period after described first period:
The free competition period, within this period, transmit in non-reservation message, be sent to server from terminal equipment upstream message; And
Within this period, enter after the terminal equipment that will send upstream message in the terminal equipment of resting state is powered and enter wake-up states, to realize the transmission of upstream message.
5. the network multiple access method of low-power consumption as claimed in claim 4, it is characterized in that, determined the rank of all upstream messages being sent to server from terminal equipment according to significance level by described server, the upstream message that rank is high is arranged in reservation message, and the low upstream message of rank is arranged in non-reservation message, and all downstream messages are all arranged in reservation message.
6. the network multiple access method of low-power consumption as claimed in claim 3, it is characterized in that, described server is according to the quantity of upstream message and downstream message in reservation message in each beacon period, for each beacon period divides reservation up period and the reservation descending period of different duration, and at beacon periods, division information is sent to terminal equipment.
7. the network multiple access method of low-power consumption as claimed in claim 6, it is characterized in that, each beacon period is divided into n and waits the time trifle of duration, and the duration of time trifle is greater than and is issued to terminal equipment in beacon periods start message from gateway device and listens to required duration; And
Beacon periods, preengage the up period, preengage the descending period and the free competition period is the integral multiple that duration is time trifle.
8. the network multiple access method of low-power consumption as claimed in claim 7, it is characterized in that, in the free competition period, the concrete transmitting time trifle of upstream message freely determined by the terminal equipment corresponding to the transmission of the upstream message in all non-reservation message, but need the transmission signal of intercepting other terminal equipment before sending, if transmission signal can not be listened to, then carry out the transmission of upstream message immediately, if transmission signal can be listened to, the then time trifle of free backward delay transmission, and then carry out intercepting to determine whether to send, until current beacon cycle terminates.
9. the network multiple access method of low-power consumption as claimed in claim 8, it is characterized in that, described server is according to the character of upstream message in the beacon period, upstream message to be answered is replied, and the beacon periods in X beacon period after this beacon period, to all binding response messages that should send in this beacon period to terminal equipment, wherein X is integer.
10. the network multiple access method of low-power consumption as claimed in claim 1, it is characterized in that, in beacon periods, also send the timestamp of labeling gateway equipment current time, after terminal equipment receives this timestamp, the adjustment time of terminal equipment and the time synchronized of Network Management Equipment.
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| WO2017128661A1 (en) * | 2016-01-29 | 2017-08-03 | 华为技术有限公司 | Method for data transmission in wireless local area network, access point and station |
| CN107580375A (en) * | 2016-07-05 | 2018-01-12 | 珠海市魅族科技有限公司 | Communication means, communicator and the website of WLAN |
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| CN109922163A (en) * | 2017-12-13 | 2019-06-21 | 中国电信股份有限公司 | File transmitting method, access gateway of internet of things and Internet of things system |
| CN110958713A (en) * | 2019-11-29 | 2020-04-03 | 武汉智菱物联科技有限公司 | Low-power-consumption communication method based on dormancy and awakening mechanism |
| CN111031107A (en) * | 2019-11-29 | 2020-04-17 | 武汉智菱物联科技有限公司 | Geological disaster monitoring system and method based on low-power-consumption communication network |
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