CN114584172B - Method for increasing WIA-PA network scale - Google Patents
Method for increasing WIA-PA network scale Download PDFInfo
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- CN114584172B CN114584172B CN202210276523.3A CN202210276523A CN114584172B CN 114584172 B CN114584172 B CN 114584172B CN 202210276523 A CN202210276523 A CN 202210276523A CN 114584172 B CN114584172 B CN 114584172B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000004891 communication Methods 0.000 claims abstract description 17
- 230000001360 synchronised effect Effects 0.000 claims description 21
- 238000005304 joining Methods 0.000 claims description 14
- 238000013468 resource allocation Methods 0.000 claims description 7
- 238000011084 recovery Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 abstract description 2
- 230000003993 interaction Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004801 process automation Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/74—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for increasing reliability, e.g. using redundant or spare channels or apparatus
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/04—Arrangements for maintaining operational condition
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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 relates to a method for increasing the scale of a WIA-PA network, wherein a WIA-PA gateway comprises 3 radio frequency transceiver terminals; the 3 radio frequencies of the WIA-PA gateway are divided into primary and secondary, wherein the radio frequency 1 position is the primary radio frequency; the radio frequency 2 position is the secondary main radio frequency; the radio frequency 3 position is the secondary radio frequency. The invention is based on the WIA-PA gateway, and expands the communication bandwidth of the WIA-PA gateway by increasing the radio frequency number; the utilization rate of time division network resources is improved by reasonably distributing the resources; through interaction and detection among radio frequencies, a redundancy function is realized, so that the network can operate uninterruptedly. Through the method, the WIA-PA network using 3 radio frequency modules is increased by 2 times compared with the prior method using 1 radio frequency module.
Description
Technical Field
The invention belongs to the technical field of wireless sensor networks, and particularly relates to a method for increasing the scale of a WIA-PA network.
Background
In recent years, wireless sensor network technology has been rapidly developed, and wireless sensor networks have been widely deployed in various fields. With the gradual popularization of ubiquitous sensor network services and the development of informatization and big data, the establishment and the use of a large-scale wireless sensor network are the development trend of the wireless sensor network.
The WIA-PA (industrial wireless network standard technology for industrial process automation) standard is a WIA sub-standard formulated by the China Industrial Wireless alliance for the field of process automation, and is a wireless network system for industrial process measurement, monitoring and control based on the IEEE 802.15.4 standard. The WIA-PA is widely applied to a plurality of industries such as petroleum, chemical industry and the like from standard formulation to the present, and with the continuous increase of acquisition equipment, the arrangement of gateways is also required to be increased, so that the reduction of the cost is key, and the increase of the network scale is a problem to be solved urgently.
The WIA-PA network is a convergence time-division & frequency-division multiplexing network with a gateway as a center, and the gateway is used as a data convergence center, and can only communicate with one terminal device on one channel in the same time slot, so that the frequency-division multiplexing for the gateway loses the effect of expanding bandwidth.
The invention aims at the problems and provides a method for increasing the radio frequency number of the WIA-PA gateway and the resource allocation of frequency division multiplexing, by which the scale of the WIA-PA network can be multiplied.
Disclosure of Invention
In order to reduce the installation cost of the gateway, the invention aims to provide a method for increasing the number of radio frequencies and the resource allocation in order to increase the scale of the WIA-PA network, and the invention can multiply the scale of the WIA-PA network.
The technical scheme adopted by the invention for realizing the purposes is as follows: a method of increasing the size of a WIA-PA network comprising the steps of:
sequentially scanning 3 radio frequency interfaces of the WIA-PA gateway, and determining that the three radio frequency modules are a main radio frequency module, a secondary main radio frequency module and a secondary radio frequency module respectively;
allocating short addresses and communication resources to each radio frequency module in sequence, so that the three radio frequency modules transmit and receive data in different channels at the same time;
the method comprises the steps that a primary radio frequency module starts broadcasting, and a secondary primary radio frequency module monitors and synchronizes with the primary radio frequency broadcasting; the secondary radio frequency module monitors the primary radio frequency broadcast and the secondary primary radio frequency broadcast and is synchronous with the broadcast of the primary radio frequency or the secondary primary radio frequency; the equipment to be added monitors the broadcast of the three radio frequency modules to obtain the allocated communication resources.
The secondary main radio frequency module monitors and synchronizes with the main radio frequency broadcast, and comprises the following steps:
when the existence of the main radio frequency is detected, the secondary main radio frequency module is synchronous with the broadcasting of the main radio frequency module;
when the main radio frequency is detected to be missing or faulty, the role of the secondary main radio frequency module is updated to the main radio frequency, and the secondary main radio frequency module is used as a clock source of a network to broadcast own time and is not synchronous with other broadcasts;
and switching back to the secondary main radio frequency role when the main radio frequency recovery is detected, and synchronizing with the main radio frequency broadcast.
The secondary radio frequency module monitors a primary radio frequency broadcast and a secondary primary radio frequency broadcast, is synchronous with the broadcast of the primary radio frequency or the secondary primary radio frequency, and comprises the following steps:
when the presence of the main radio frequency or the secondary main radio frequency is detected, the secondary radio frequency is synchronous with the broadcast of the main radio frequency or the secondary main radio frequency;
when the main radio frequency and the secondary main radio frequency are detected to be absent or faulty, the role of the secondary radio frequency module is updated to the main radio frequency, and the secondary radio frequency module is used as a clock source of a network to broadcast own time and does not need to be synchronized with other broadcasts;
when the recovery of the main radio frequency or the secondary main radio frequency is detected, the role of the secondary radio frequency is immediately switched back to be synchronous with the broadcasting of the main radio frequency or the secondary main radio frequency.
The resource allocation mode of the three radio frequency modules is a frequency division multiplexing mode, namely, the communication resources except broadcasting of the main radio frequency module, the secondary main radio frequency module and the secondary radio frequency module are all different channels of the same time slot.
The broadcast of the three radio frequency modules includes the current role of the radio frequency module and the total number of nodes in the band.
After the broadcasting of the three radio frequency modules is synchronized, the radio frequency broadcasting is normally transmitted, so that after the equipment to be added receives the broadcasting of the 3 radio frequency modules, firstly, comparing the number of the sub-nodes of the three radio frequency modules, selecting the radio frequency module with the minimum number of the sub-nodes to access the network, and transmitting a joining request to the manager through the joining time slot of the radio frequency module;
after receiving a joining request of the equipment to be joined, the manager allocates resources to the radio frequency module selected by the equipment to be joined; in the resource list, selecting the time slot occupied by another two radio frequency modules but not occupied by the radio frequency modules, and selecting the channel different from the occupied channel from the available channels, and distributing the channel to the radio frequency modules and the first-hop communication link on the path of the device to be added.
A gateway for increasing the size of a WIA-PA network, comprising:
the manager is used for sequentially scanning the 3 radio frequency interfaces of the WIA-PA gateway and determining that the three radio frequency modules are a main radio frequency module, a secondary main radio frequency module and a secondary radio frequency module respectively; allocating short addresses and communication resources to each radio frequency module in sequence, so that the three radio frequency modules transmit and receive data in different channels at the same time;
the manager is used for receiving the joining request; the joining request is a joining request sent by the radio frequency module, wherein the joining request is obtained by comparing the number of the sub-nodes of the three radio frequency modules, selecting the radio frequency module with the least number of the sub-nodes to access the network; in the resource list, selecting the time slot occupied by another two radio frequency modules but not occupied by the radio frequency modules, and selecting the channel different from the occupied channel from the available channels, and distributing the channel to the radio frequency modules and the first-hop communication link on the path of the device to be added.
The method for increasing the WIA-PA network scale can obviously increase the network scale, and has the beneficial effects that:
the WIA-PA network scale is multiplied according to the number of radio frequencies;
the WIA-PA gateway radio frequency has a redundant function;
3, the number of each radio frequency equalized sub-node of the WIA-PA gateway;
and 4, improving the resource utilization rate of the WIA-PA network.
Drawings
FIG. 1 is a schematic diagram of WAI-PA gateway equipment;
FIG. 2 is a schematic diagram of the initial resource allocation situation of the WIA-PA gateway;
FIG. 3 is a schematic diagram of a secondary main radio frequency state machine;
FIG. 4 is a schematic diagram of a radio frequency state machine;
FIG. 5 is a schematic diagram of the resource occupancy prior to the addition of a new node;
FIG. 6 is a schematic diagram of a resource occupancy request after a new node has joined.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The invention is based on the WIA-PA gateway, and expands the communication bandwidth of the WIA-PA gateway by increasing the radio frequency number; the utilization rate of time division network resources is improved by reasonably distributing the resources; through interaction and detection among radio frequencies, a redundancy function is realized, so that the network can operate uninterruptedly. Through the method, the WIA-PA network using 3 radio frequency modules is increased by 2 times compared with the prior method using 1 radio frequency module.
A method for increasing the scale of a WIA-PA network, comprising:
the WIA-PA network is a time division network taking a gateway as a center;
the WIA-PA gateway comprises 3 radio frequency transceiver terminals;
the 3 radio frequencies of the WIA-PA gateway are divided into primary and secondary, wherein: the radio frequency 1 position is the main radio frequency; the radio frequency 2 position is the secondary main radio frequency; the radio frequency 3 position is the secondary radio frequency;
the WIA-PA gateway main radio frequency defaults to a clock source of the WIA-PA network, and is not synchronous with other broadcasting at any moment;
the WIA-PA gateway secondary main radio frequency is synchronized with the broadcast of the main radio frequency when the main radio frequency exists; when the main radio frequency is missing or fails, the secondary main radio frequency is upgraded to the main radio frequency, is used as a clock source of a network, broadcasts own time, and does not need to be synchronized with other broadcasts; when the recovery of the main radio frequency is detected, the secondary main radio frequency role is immediately switched back to be synchronous with the main radio frequency broadcast.
The WIA-PA gateway secondary radio frequency is synchronous with the broadcast of the primary radio frequency or the secondary primary radio frequency when the primary radio frequency or the secondary primary radio frequency exists; when the main radio frequency and the secondary main radio frequency are in missing or fault, the secondary radio frequency is updated to the main radio frequency, is used as a clock source of a network, broadcasts own time, and does not need to be synchronized with other broadcasts; when the recovery of the main radio frequency or the secondary main radio frequency is detected, immediately switching back to the secondary radio frequency role, and synchronizing with the broadcasting of the main radio frequency or the secondary main radio frequency;
the 3 radio frequency resource allocation modes of the WIA-PA gateway are frequency division multiplexing modes, namely communication resources except broadcasting of radio frequency 1, radio frequency 2 and radio frequency 3 are different channels with the same time slot as far as possible;
the WIA-PA gateway broadcasts 3 radio frequencies, which all contain the current role of the radio frequency and the total number of the nodes.
The WIA-PA gateway consists of a manager and 3 radio frequency modules, and as shown in figure 1, the 3 radio frequency modules are connected with the manager through serial ports.
The WIA-PA gateway is powered on initially, firstly, 3 radio frequency interfaces are scanned in sequence, whether the 3 radio frequency interfaces are inserted into radio frequency modules or not is scanned, and the role of each radio frequency module is determined: a primary radio frequency, a secondary primary radio frequency, and a secondary radio frequency.
Assuming that all 3 radio frequency interfaces are inserted into a radio frequency module, after the number and roles of radio frequency access are determined, short addresses and communication resources are allocated to each radio frequency in sequence. Wherein the short address of the primary radio frequency is 0001, the short address of the secondary primary radio frequency is 0002, and the short address of the secondary radio frequency is 0003; the broadcasting time slots of the 3 radio frequencies are different time slots of the same channel in sequence; the adding receiving and sending time slots of the 3 radio frequencies are any available channels of different time slots in sequence. Such as shown in fig. 2, is one case of initializing resource allocation.
After the initialization is completed, the main radio frequency module starts broadcasting, and the broadcasting has own roles (main radio frequency) and the number of child nodes fields; the secondary main radio frequency and the secondary radio frequency enter a receiving state, continuously monitor the broadcast of the main radio frequency on a broadcast channel, check a role field in the broadcast, confirm that the broadcast is the main radio frequency broadcast, synchronize the broadcast with the primary radio frequency broadcast, and discard the broadcast if not; after the secondary main radio frequency and the secondary radio frequency continuously receive 2 main radio frequency broadcasts, synchronization is successful, and the respective broadcasts are sent on respective broadcast time slots, and the broadcasts also have own roles and byte point number fields.
After the synchronization is completed, the 3 radio frequencies all transmit respective broadcasts in respective broadcast time slots, and the secondary main radio frequency and the secondary radio frequency still need to monitor the broadcasts of the main radio frequency continuously and keep synchronization.
After the synchronization is completed, the secondary main radio frequency and the secondary radio frequency still need to monitor the broadcast of the main radio frequency continuously and keep the synchronization. When the secondary main radio frequency continuously receives the broadcast of the main radio frequency for 10 times, judging that the main radio frequency is lost or fails, changing the self role into the main radio frequency, informing a manager of the judging result and the role switching result, and transmitting the broadcast of the main radio frequency in the own broadcast time slot, wherein the state conversion process of the secondary main radio frequency is shown in figure 3; when the secondary radio frequency continuously receives the broadcast of the main radio frequency for 10 times, the radio frequency is set to be in a long receiving state, if the broadcast of the main radio frequency is still not received for 60 seconds, the situation that both the main radio frequency and the secondary main radio frequency are lost or fail is judged, the roles of the secondary radio frequency are changed into the main radio frequency, the judging result and the role switching result are notified to the manager, the broadcast of the main radio frequency is sent in the broadcasting time slot of the secondary radio frequency, and the state conversion process of the secondary radio frequency is shown in fig. 4.
After the secondary main radio frequency or the secondary radio frequency is switched to the main radio frequency role, broadcasting still needs to be monitored in the broadcasting time slots of the original main radio frequency and the original secondary main radio frequency.
When the main radio frequency is recovered, the method firstly needs to enter a long receiving state, monitors whether the broadcast of the main radio frequency exists, synchronizes with the main radio frequency if the broadcast of the main radio frequency exists, and sends the broadcast of the main radio frequency after the synchronization is successful; when the primary radio frequency monitors that the primary radio frequency broadcast is recovered, the role of the primary radio frequency broadcast is switched back to the secondary radio frequency broadcast;
after the secondary main radio frequency is recovered, the secondary main radio frequency enters a long receiving state, monitors whether the broadcast of the main radio frequency exists, synchronizes with the main radio frequency if the broadcast exists, judges whether the main radio frequency broadcast is from the main radio frequency or the secondary radio frequency, keeps the roles of the secondary main radio frequency unchanged if the broadcast is the original main radio frequency broadcast, and transmits the broadcast of the secondary main radio frequency; if the broadcast is primary radio frequency broadcast, the broadcast is switched to a main radio frequency role, and the broadcast of the main radio frequency is sent.
When the secondary radio frequency receives the primary radio frequency or the primary radio frequency broadcast sent by the primary radio frequency, the role of the secondary radio frequency is switched to the secondary radio frequency, and the secondary radio frequency broadcast is sent.
When the radio frequency broadcast is normally transmitted, the terminal equipment to be added can monitor the broadcast of 3 radio frequency modules at most. After receiving the broadcast of 3 radio frequency modules, the terminal equipment to be added firstly compares the number of the sub-nodes of the 3 radio frequency modules, selects the radio frequency module with the least number of the sub-nodes to access the network, and sends an addition request to the manager through the addition time slot of the radio frequency module, so as to ensure the network balance of the 3 radio frequency modules.
After receiving the joining request of the equipment to be joined, the manager allocates resources to the radio frequency modules selected by the equipment to be joined, selects the time slots which are occupied by the other two radio frequency modules but not occupied by the radio frequency modules in the resource table, selects the channels which are different from the occupied channels from the available channels, and allocates the channels to the radio frequency modules and the first-hop communication links on the paths of the equipment to be joined so as to realize the optimal utilization of the resources.
For example, when 1 subsection B is added to the network at the main radio frequency, and the resource occupation of the main radio frequency is shown in fig. 5, where the time slot 20 is the time slot resource sent to the node B by the main radio frequency, and the time slot 80 is the time slot resource sent to the main radio frequency by the node B; at this time, when the second node C uploads the join request message through the secondary main radio frequency, and allocates resources for the node, first, find the time slot that has been occupied by other two radio frequencies and has an available channel free, and ensure that the gateway end of the time slot is the transmitting end or is the receiving end, that is, first, find the time slot 20, when the channel 11 is occupied, and both channels 16 and 21 are free, the time slot may be allocated to the node C, then, when the occupied 11 channel is checked, 20 is sent by the gateway, and the node B receives, then, when allocated to the node C, the node C also has to send by the gateway, the node C receives, so that radio frequency interference between two antennas can be avoided, and accordingly, other resources of the node C continue to be allocated, and if the occupied time slot with a free channel is not found, other free time slots can be allocated at will, and the network resource condition after the node C enters the network is shown in fig. 6.
Assuming that the number of the sub-nodes accessed by the 3 radio frequency modules is the same and the links are the same, the broadcast channel of the network manager is 11 channels, and the available channels are 11, 16, 21 and 26, the 3 radio frequency modules increase the access bandwidth of the gateway to 3 times; and then, resources are allocated to the 3 radio frequency modules by a frequency division multiplexing method, so that 3 radio frequencies of the gateway transmit and receive data on different channels simultaneously, an interactive link for distributing resources to a far-end multi-hop node is saved, the maximum utilization rate of time slot resources can be obtained, namely, a WIA-PA network of the 3 radio frequency modules can be accessed to a 500-point mesh network.
Claims (6)
1. A method for increasing the size of a WIA-PA network comprising the steps of:
sequentially scanning 3 radio frequency interfaces of the WIA-PA gateway, and determining that the three radio frequency modules are a main radio frequency module, a secondary main radio frequency module and a secondary radio frequency module respectively;
allocating short addresses and communication resources to each radio frequency module in sequence, so that the three radio frequency modules transmit and receive data in different channels at the same time;
the method comprises the steps that a primary radio frequency module starts broadcasting, and a secondary primary radio frequency module monitors and synchronizes with the primary radio frequency broadcasting; the secondary radio frequency module monitors the primary radio frequency broadcast and the secondary primary radio frequency broadcast and is synchronous with the broadcast of the primary radio frequency or the secondary primary radio frequency;
the equipment to be added monitors the broadcast of the three radio frequency modules to obtain the distributed communication resources;
the secondary radio frequency module monitors a primary radio frequency broadcast and a secondary primary radio frequency broadcast, is synchronous with the broadcast of the primary radio frequency or the secondary primary radio frequency, and comprises the following steps:
when the presence of the main radio frequency or the secondary main radio frequency is detected, the secondary radio frequency is synchronous with the broadcast of the main radio frequency or the secondary main radio frequency;
when the main radio frequency and the secondary main radio frequency are detected to be absent or faulty, the role of the secondary radio frequency module is updated to the main radio frequency, and the secondary radio frequency module is used as a clock source of a network to broadcast own time and does not need to be synchronized with other broadcasts;
when the recovery of the main radio frequency or the secondary main radio frequency is detected, immediately switching back to the secondary radio frequency role, and synchronizing with the broadcasting of the main radio frequency or the secondary main radio frequency;
the resource allocation mode of the three radio frequency modules is a frequency division multiplexing mode, namely, the communication resources except broadcasting of the main radio frequency module, the secondary main radio frequency module and the secondary radio frequency module are all different channels of the same time slot.
2. The method of claim 1, wherein the secondary primary radio frequency module listens to and synchronizes with a primary radio frequency broadcast, comprising the steps of:
when the existence of the main radio frequency is detected, the secondary main radio frequency module is synchronous with the broadcasting of the main radio frequency module;
when the main radio frequency is detected to be missing or faulty, the role of the secondary main radio frequency module is updated to the main radio frequency, and the secondary main radio frequency module is used as a clock source of a network to broadcast own time and is not synchronous with other broadcasts;
and switching back to the secondary main radio frequency role when the main radio frequency recovery is detected, and synchronizing with the main radio frequency broadcast.
3. The method of claim 1 wherein the broadcast of three rf modules each includes the current role of the rf module and the total number of nodes in the band.
4. The method for increasing the WIA-PA network scale according to claim 1, wherein after the broadcasting of the three radio frequency modules is synchronized, the radio frequency broadcasting is normally transmitted, so that after the equipment to be added receives the broadcasting of the 3 radio frequency modules, firstly comparing the number of the sub-nodes of the three radio frequency modules, selecting the radio frequency module with the minimum number of the sub-nodes to access the network, and transmitting a joining request to the manager through the joining time slot of the radio frequency module;
after receiving a joining request of the equipment to be joined, the manager allocates resources to the radio frequency module selected by the equipment to be joined; in the resource list, selecting the time slot occupied by another two radio frequency modules but not occupied by the radio frequency modules, and selecting the channel different from the occupied channel from the available channels, and distributing the channel to the radio frequency modules and the first-hop communication link on the path of the device to be added.
5. The method of increasing the size of a WIA-PA network of claim 1, wherein the WIA-PA gateway comprises:
the manager is used for sequentially scanning the 3 radio frequency interfaces of the WIA-PA gateway and determining that the three radio frequency modules are a main radio frequency module, a secondary main radio frequency module and a secondary radio frequency module respectively; and sequentially distributing short addresses and communication resources to each radio frequency module, so that the three radio frequency modules transmit and receive data in different channels at the same time.
6. The method of claim 5, wherein the manager is configured to receive a join request; the joining request is a joining request sent by the radio frequency module, wherein the joining request is obtained by comparing the number of the sub-nodes of the three radio frequency modules, selecting the radio frequency module with the least number of the sub-nodes to access the network; in the resource list, selecting the time slot occupied by another two radio frequency modules but not occupied by the radio frequency modules, and selecting the channel different from the occupied channel from the available channels, and distributing the channel to the radio frequency modules and the first-hop communication link on the path of the device to be added.
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| 工业无线6TiSCH协议栈的设计与实现;李鑫;中国优秀硕士学位论文全文数据库;全文 * |
| 工业无线网络管理器的设计与实现;李敏;朱元杰;王恒;王彦斌;;自动化仪表(第06期);全文 * |
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