CN114584172A - Method for increasing WIA-PA network scale - Google Patents
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- 238000013468 resource allocation Methods 0.000 claims description 7
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- H—ELECTRICITY
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- 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
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- 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
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Abstract
The invention relates to a method for increasing WIA-PA network scale, the WIA-PA gateway includes 3 radio frequency transmit-receive ends; 3 radio frequencies of the WIA-PA gateway have primary and secondary scores, wherein the position of radio frequency 1 is a primary radio frequency; the radio frequency 2 position is a secondary main radio frequency; the radio frequency 3 location is a secondary radio frequency. Based on the WIA-PA gateway, the invention enlarges the communication bandwidth of the WIA-PA gateway by increasing the number of radio frequencies; 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, and the network can run uninterruptedly. By the method, the WIA-PA network with 3 radio frequency modules is used, and the network scale is increased by 2 times compared with that when 1 radio frequency module is used before.
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 facing industrial process automation) standard is a WIA sub-standard established by the China industry wireless alliance aiming at the field of process automation, and is a wireless network system for measuring, monitoring and controlling industrial processes based on the IEEE 802.15.4 standard. WIA-PA has been widely applied to multiple industries such as petroleum, chemical industry and the like from standard establishment to the present, along with the continuous increase of acquisition equipment, the arrangement of gateways needs to be increased, and in order to reduce cost and reduce the arrangement of gateways, the increase of network scale is a problem to be solved urgently.
The WIA-PA network is a convergence type time division and frequency division multiplexing network with a gateway as a center, 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 loses the function of expanding the bandwidth for the gateway.
Aiming at the problems, the invention provides a method for increasing WIA-PA gateway radio frequency number and resource allocation of frequency division multiplexing, and the method can multiply the WIA-PA network scale.
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 resource allocation in order to increase the scale of the WIA-PA network.
The technical scheme adopted by the invention to realize the purpose is as follows: a method of scaling up a WIA-PA network, comprising the steps of:
sequentially scanning 3 radio frequency interfaces of the WIA-PA gateway, and determining three radio frequency modules as a main radio frequency module, a sub-main radio frequency module and a sub-radio frequency module respectively;
allocating short addresses and communication resources to each radio frequency module in sequence, so that the three radio frequency modules simultaneously transmit and receive data in different channels;
the main radio frequency module starts broadcasting, and the secondary main radio frequency module monitors the main radio frequency broadcasting and synchronizes with the main 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; so that the equipment to be added monitors the broadcast of the three radio frequency modules to obtain the distributed communication resources.
The secondary main radio frequency module monitors the main radio frequency broadcast and is synchronous with the main radio frequency broadcast, and the method comprises the following steps:
when the main radio frequency is detected to exist, the broadcasting of the sub main radio frequency module and the broadcasting of the main radio frequency module are synchronous;
when the primary radio frequency is detected to be absent or failed, the role of the secondary primary radio frequency module is upgraded to the primary radio frequency and is used as a clock source of a network to broadcast own time without being synchronous with other broadcasts;
and when the recovery of the main radio frequency is detected, switching back to the role of the secondary main radio frequency and synchronizing with the main radio frequency broadcast.
The sub-radio frequency module monitors the main radio frequency broadcast and the sub-main radio frequency broadcast, and is synchronous with the broadcast of the main radio frequency or the sub-main radio frequency, and the method comprises the following steps:
when the existence of the main radio frequency or the sub-main radio frequency is detected, the broadcasting of the sub-radio frequency and the main radio frequency or the sub-main radio frequency is synchronous;
when the primary radio frequency and the secondary primary radio frequency are detected to be absent or have faults, the role of the secondary radio frequency module is upgraded to the primary radio frequency and is used as a clock source of a network to broadcast own time without being synchronous with other broadcasts;
when the recovery of the main radio frequency or the sub-main radio frequency is detected, the role of the sub-radio frequency is immediately switched back to be synchronous with the broadcast of the main radio frequency or the sub-main radio frequency.
The resource allocation mode of the three radio frequency modules is a frequency division multiplexing mode, namely the communication resources of the main radio frequency module, the secondary main radio frequency module and the secondary radio frequency module except for broadcasting are different channels of the same time slot.
The broadcasts of the three radio frequency modules all include the current role of the radio frequency module and the total number of the child nodes carried by the radio frequency module.
After the broadcasts of the three radio frequency modules are synchronized, the radio frequency broadcasts are normally sent, so that after equipment to be added receives the broadcasts of the 3 radio frequency modules, the number of sub-nodes of the three radio frequency modules is compared, the radio frequency module with the least number of the sub-nodes is selected to be accessed into a network, and an addition request is sent to a manager through an addition receiving 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 table, selecting time slots occupied by the other two radio frequency modules but not occupied by the radio frequency modules, selecting channels different from the occupied channels from available channels, and allocating the channels to the radio frequency modules and a first hop communication link on a path of the equipment to be joined.
A gateway to scale up a WIA-PA network, comprising:
the manager is used for scanning 3 radio frequency interfaces of the WIA-PA gateway in sequence and determining three radio frequency modules as a main radio frequency module, a sub-main radio frequency module and a sub-radio frequency module respectively; allocating short addresses and communication resources to each radio frequency module in sequence, so that the three radio frequency modules simultaneously transmit and receive data in different channels;
the manager is used for receiving a joining request; the joining request is a joining request sent by a radio frequency module which selects the radio frequency module with the least number of sub nodes to access the network by comparing the number of the sub nodes of the three radio frequency modules of the equipment to be joined; in the resource table, selecting time slots occupied by the other two radio frequency modules but not occupied by the radio frequency modules, selecting channels different from the occupied channels from the available channels, and allocating the channels to the radio frequency modules and the first hop communication links on the paths of the devices to be joined.
The method for increasing the WIA-PA network scale provided by the invention 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 redundancy function;
3, balancing the number of sub-nodes of each radio frequency of the WIA-PA gateway;
resource utilization improvement in WIA-PA networks.
Drawings
FIG. 1 is a schematic diagram of the WAI-PA gateway device;
FIG. 2 is a schematic diagram of WIA-PA gateway initial resource allocation;
FIG. 3 is a schematic diagram of a secondary primary radio frequency state machine;
FIG. 4 is a schematic diagram of an RF state machine;
FIG. 5 is a schematic diagram of resource occupation before a new node is added;
fig. 6 is a schematic diagram of a resource occupation request after a new node is added.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Based on the WIA-PA gateway, the invention enlarges the communication bandwidth of the WIA-PA gateway by increasing the number of radio frequencies; the utilization rate of time division network resources is improved by reasonably distributing the resources; through interaction and detection among the radio frequencies, the redundancy function is realized, and the network can operate uninterruptedly. By the method, the WIA-PA network with 3 radio frequency modules is used, and the network scale is increased by 2 times compared with that when 1 radio frequency module is used before.
A method for increasing the WIA-PA network scale specifically comprises the following steps:
the WIA-PA network is a time division network taking a gateway as a center;
the WIA-PA gateway comprises 3 radio frequency transceiving ends;
the 3 radio frequencies of the WIA-PA gateway have primary and secondary scores, wherein: the radio frequency 1 position is a main radio frequency; the radio frequency 2 position is a secondary main radio frequency; the radio frequency 3 position is a secondary radio frequency;
the WIA-PA gateway master radio frequency is a clock source of the WIA-PA network by default and is not synchronous with other broadcasts at any time;
when the main radio frequency exists, the broadcasting of the sub main radio frequency and the main radio frequency is synchronous; when the main radio frequency is lost or fails, the secondary main radio frequency is upgraded to the main radio frequency and used as a clock source of the network to broadcast the time of the secondary main radio frequency without synchronizing with other broadcasts; when the recovery of the main radio frequency is detected, the role of the secondary main radio frequency is immediately switched back to be synchronous with the main radio frequency broadcast.
When the main radio frequency or the secondary main radio frequency exists, the broadcasting of the secondary radio frequency and the main radio frequency or the secondary main radio frequency is synchronous; when the main radio frequency and the secondary main radio frequency are lost or failed, the secondary radio frequency is upgraded to the main radio frequency and used as a clock source of a network to broadcast own time without being synchronous with other broadcasts; when the main radio frequency or the sub-main radio frequency is detected to be recovered, immediately switching back to the role of the sub-radio frequency, and synchronizing with the broadcast of the main radio frequency or the sub-main radio frequency;
in the WIA-PA gateway, the resource allocation mode of 3 radio frequencies is a frequency division multiplexing mode, namely communication resources except for broadcasting of the radio frequency 1, the radio frequency 2 and the radio frequency 3 are different channels of the same time slot as much as possible;
in the WIA-PA gateway, the broadcast of 3 radio frequencies comprises the current role of the radio frequency and the total number of the sub nodes.
The WIA-PA gateway is composed 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 initially electrified, and firstly, 3 radio frequency interfaces are sequentially scanned, whether the 3 radio frequency interfaces are inserted into radio frequency modules is scanned, and the role of each radio frequency module is determined: primary radio frequency, secondary primary radio frequency, and secondary radio frequency.
Assuming that 3 radio frequency interfaces are all inserted into a radio frequency module, after the number and roles of radio frequency accesses are determined, short addresses and communication resources are sequentially allocated to each radio frequency. Wherein, the short address of the main radio frequency is 0001, the short address of the sub-main radio frequency is 0002, and the short address of the sub-radio frequency is 0003; the broadcast time slots of 3 radio frequencies are different time slots of the same channel in sequence; the adding receiving and adding sending time slots of 3 radio frequencies are any available channels of different time slots in sequence. Such as shown in fig. 2, is a case of initializing resource allocation.
After initialization is completed, the main radio frequency module starts broadcasting, and the broadcasting has a self role (main radio frequency) and a sub-node number field; the secondary main radio frequency and the secondary radio frequency enter a receiving state, the broadcast of the main radio frequency is continuously monitored on a broadcast channel, the role field in the broadcast is checked, the broadcast is synchronous with the main radio frequency if the broadcast is confirmed to be the main radio frequency, and otherwise, the broadcast is discarded; after the secondary main radio frequency and the secondary radio frequency continuously receive 2 main radio frequency broadcasts, the synchronization is successful, and the respective broadcasts are sent on respective broadcast time slots, and similarly, the broadcasts also have self roles and word node number fields.
After the synchronization is completed, the 3 radio frequencies all send respective broadcasts in respective broadcast time slots, and the secondary main radio frequency and the secondary radio frequency still need to continuously monitor the broadcasts of the main radio frequency and keep synchronization.
After the synchronization is completed, the secondary primary and secondary radio frequencies still need to continue to monitor the broadcast of the primary radio frequency and keep in synchronization. When the secondary primary radio frequency does not receive the broadcast of the primary radio frequency for 10 times continuously, judging that the primary radio frequency is missing or failed, changing the role of the secondary primary radio frequency into the primary radio frequency, informing the manager of the judgment result and the role switching result, and sending the broadcast of the primary radio frequency in the broadcast time slot of the secondary primary radio frequency, wherein the state switching process of the secondary primary radio frequency is shown in fig. 3; when the secondary radio frequency does not receive the broadcast of the primary radio frequency for 10 times continuously, the radio frequency is set to be in a long receiving state, if the broadcast of the primary radio frequency cannot be received for 60 seconds, the primary radio frequency and the secondary primary radio frequency are judged to be missing or failed, the role of the secondary radio frequency is changed into the primary radio frequency, the judgment result and the role switching result are notified to the manager, the broadcast of the primary radio frequency is sent in the broadcast time slot of the secondary radio frequency, and the state switching process of the secondary radio frequency is shown in fig. 4.
The secondary primary radio frequency or the secondary radio frequency still needs to monitor the broadcast in the broadcast time slot of the original primary radio frequency and the original secondary primary radio frequency after being switched to the role of the primary radio frequency.
After the main radio frequency is recovered, the main radio frequency is required to enter a long receiving state first, whether the broadcast of the main radio frequency exists is monitored, if yes, the main radio frequency is synchronized with the broadcast of the main radio frequency, and after the synchronization is successful, the broadcast of the main radio frequency is sent; when the primary radio frequency monitors that the main radio frequency broadcast is recovered, the role of the primary radio frequency broadcast is switched to the secondary radio frequency broadcast;
after the secondary main radio frequency is recovered, the long receiving state is also entered, whether the broadcast of the main radio frequency exists or not is monitored, if yes, the broadcast is synchronous with the main radio frequency, whether the broadcast of the main radio frequency comes from the main radio frequency or the secondary radio frequency is judged, if the broadcast is the original broadcast of the main radio frequency, the role of the secondary main radio frequency is kept unchanged, and the broadcast of the secondary main radio frequency is sent; if the broadcast is the primary radio frequency broadcast, the radio frequency broadcast is switched to the main radio frequency role, and the broadcast of the main radio frequency is sent.
When the secondary radio frequency receives the primary radio frequency broadcast sent by the original primary radio frequency or the original secondary radio frequency, the role of the secondary radio frequency is switched to the secondary radio frequency, and the broadcast of the secondary radio frequency is sent.
When the radio frequency broadcast is normally sent, the terminal equipment to be added can monitor the broadcast of 3 radio frequency modules at most. After the terminal equipment to be added receives the broadcast of the 3 radio frequency modules in sequence, the number of the sub-nodes of the 3 radio frequency modules is compared, the radio frequency module with the least number of the sub-nodes is selected to be accessed into the network, and an adding request is sent to the manager through the adding receiving time slot of the radio frequency module, so that the network balance of the 3 radio frequency modules is ensured.
After receiving a joining request of a device to be joined, a manager allocates resources to a radio frequency module selected by the device to be joined, selects a time slot occupied by the other two radio frequency modules but not occupied by the radio frequency module in a resource table, selects a channel different from the occupied channel from available channels, and allocates the channel to the radio frequency module and a first hop communication link on a path of the device to be joined, so that the optimal utilization of the resources is realized.
For example, when 1 subnode B has joined the network under the primary radio frequency, and the resource occupation of the primary radio frequency is as shown in fig. 5, where the timeslot 20 is a timeslot resource sent by the primary radio frequency to the node B, and the timeslot 80 is a timeslot resource sent by the node B to the primary radio frequency; at this time, the second node C uploads the join request message through the secondary primary radio frequency, when the node is allocated with resources, firstly searches the time slot which is occupied by other two radio frequencies and still has free available channels, and ensures that the gateway ends of the time slot are all sending ends or all receiving ends, i.e., slot 20 is found first, is occupied on channel 11, is free on both channels 16 and 21, then this slot may be allocated to node C, then, when the occupied 11 channels are viewed, 20 is gateway sending and node B receiving, and when the occupied 11 channels are allocated to the node C, the channels must be gateway sending and node C receiving, this avoids radio interference between the two antennas, and thus, other resources of the C node are continuously allocated, and if no time slot with an occupied and free channel is found, other idle time slots can be randomly allocated, and the network resource condition after the C node accesses the network is as shown in fig. 6.
Assuming that the number of the sub-nodes accessed by the 3 radio frequency modules is the same, 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 access bandwidth of the gateway is increased by 3 times by the 3 radio frequency modules; and then through the method of frequency division multiplexing, distribute resources for 3 radio frequency modules, make 3 radio frequencies of the gateway receive and dispatch the data on different signal channels at the same time, save the resource and distribute to the interactive link of the distant end multihop node, can make the time slot resource obtain the maximum utilization factor, namely WIA-PA network of 3 radio frequency modules, can insert 500 mesh networks.
Claims (8)
1. A method of scaling up a WIA-PA network, comprising the steps of:
sequentially scanning 3 radio frequency interfaces of the WIA-PA gateway, and determining three radio frequency modules as a main radio frequency module, a sub-main radio frequency module and a sub-radio frequency module respectively;
allocating short addresses and communication resources to each radio frequency module in sequence, so that the three radio frequency modules simultaneously transmit and receive data in different channels;
the main radio frequency module starts broadcasting, and the secondary main radio frequency module monitors and synchronizes with the main radio frequency broadcast; 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; so that the equipment to be added monitors the broadcast of the three radio frequency modules to obtain the distributed communication resources.
2. The method of claim 1, wherein the sub-master radio frequency module listens to and synchronizes with the master radio frequency broadcast, comprising the steps of:
when the main radio frequency is detected to exist, the broadcasting of the sub main radio frequency module and the broadcasting of the main radio frequency module are synchronous;
when the primary radio frequency is detected to be absent or failed, the role of the secondary primary radio frequency module is upgraded to the primary radio frequency and is used as a clock source of a network to broadcast own time without being synchronous with other broadcasts;
and when the recovery of the main radio frequency is detected, switching back to the role of the secondary main radio frequency and synchronizing with the main radio frequency broadcast.
3. The method of claim 1, wherein the sub-rf module listens for a primary rf broadcast and a sub-primary rf broadcast, and synchronizes with the broadcast of the primary rf or the sub-primary rf broadcast, comprising the steps of:
when the existence of the main radio frequency or the sub-main radio frequency is detected, the broadcasting of the sub-radio frequency and the main radio frequency or the sub-main radio frequency is synchronous;
when the primary radio frequency and the secondary primary radio frequency are detected to be absent or have faults, the role of the secondary radio frequency module is upgraded to the primary radio frequency and is used as a clock source of a network to broadcast own time without being synchronous with other broadcasts;
when the recovery of the main radio frequency or the sub-main radio frequency is detected, the role of the sub-radio frequency is immediately switched back to be synchronous with the broadcast of the main radio frequency or the sub-main radio frequency.
4. The method of claim 1, wherein the resource allocation of the three rf modules is frequency division multiplexing, that is, the communication resources of the primary rf module, the secondary primary rf module, and the secondary rf module except for broadcast are different channels of the same timeslot.
5. The method of claim 1 wherein the broadcasts of all three RF modules include the current role of the RF module and the total number of child nodes.
6. The method of increasing the size of a WIA-PA network of claim 1,
after the broadcasts of the three radio frequency modules are synchronized, the radio frequency broadcasts are normally sent, so that after equipment to be added receives the broadcasts of the 3 radio frequency modules, the number of sub-nodes of the three radio frequency modules is compared, the radio frequency module with the least number of the sub-nodes is selected to be accessed into a network, and an adding request is sent to a manager through an adding receiving 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 table, selecting time slots occupied by the other two radio frequency modules but not occupied by the radio frequency modules, selecting channels different from the occupied channels from available channels, and allocating the channels to the radio frequency modules and a first hop communication link on a path of the equipment to be joined.
7. A gateway for scaling up a WIA-PA network, comprising:
the manager is used for scanning 3 radio frequency interfaces of the WIA-PA gateway in sequence and determining that the three radio frequency modules are respectively a main radio frequency module, a secondary main radio frequency module and a secondary radio frequency module; and sequentially distributing short addresses and communication resources to each radio frequency module, so that the three radio frequency modules simultaneously receive and transmit data in different channels.
8. The gateway for scaling up a WIA-PA network of claim 7, wherein the manager is configured to receive a join request; the joining request is a joining request sent by a radio frequency module which selects the radio frequency module with the least number of sub nodes to access the network by comparing the number of the sub nodes of the three radio frequency modules of the equipment to be joined; in the resource table, selecting time slots occupied by the other two radio frequency modules but not occupied by the radio frequency modules, selecting channels different from the occupied channels from the available channels, and allocating the channels to the radio frequency modules and the first hop communication links on the paths of the devices to be joined.
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| YUAN DONGFENG: "Design and implementation of low power consumption based on WIA-PA Networks", 2010 3RD INTERNATIONAL CONFERENCE ON ADVANCED COMPUTER THEORY AND ENGINEERING(ICACTE) * |
| 李敏;朱元杰;王恒;王彦斌;: "工业无线网络管理器的设计与实现", 自动化仪表, no. 06 * |
| 李鑫: "工业无线6TiSCH协议栈的设计与实现", 中国优秀硕士学位论文全文数据库 * |
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