CN116419364B - Wi-SUN network and extension method through wired virtual radio frequency transmission - Google Patents
Wi-SUN network and extension method through wired virtual radio frequency transmission Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
- H04W84/22—Self-organising networks, e.g. ad-hoc networks or sensor networks with access to wired networks
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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
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- 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
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Abstract
The application relates to a Wi-SUN network transmitted by a wired virtual radio frequency and an expansion method, which are applied to the Wi-SUN network, wherein the method specifically comprises the following steps: establishing wired connection of the boundary route nodes and a plurality of route topology first layer radio frequency nodes for simulating radio frequency transmission, and taking each route topology first layer radio frequency node as a wireless access point for establishing radio frequency transmission with the radio frequency node; and according to all the wired communication protocols and the number of the wired communication lines supported by the boundary routing nodes, configuring the wired communication protocols for the boundary routing nodes and the radio frequency nodes of the first layer of each routing topology. The method of the application shunts the data forwarded by the wireless radio frequency of the boundary routing node to the first-level radio frequency node of the routing topology, and transmits the data at the confluence by wired connection, thereby improving the data throughput capacity and the transmission stability of the boundary routing node and improving the communication capacity of Wi-SUN FAN and the external network.
Description
Technical Field
The application belongs to the technical field of wireless Mesh networking, and particularly relates to a Wi-SUN network transmitted through wired virtual radio frequency and an expansion method.
Background
In Wi-SUN networks, the border routing nodes are the hubs of the Wi-SUN FAN to interact with external network data, as the border routing nodes have the ability to communicate with both the backhaul network (WAN) and the wireless radio nodes within the Wi-SUN FAN. The boundary routing node provides the capability of accessing the public network for the wireless radio frequency node in the FAN to the outside, and coordinates and manages the reference time, the frequency hopping time slot and the frequency hopping behavior of the wireless radio frequency node in the FAN. The data access in the FAN is finally completed through the mode of wireless radio frequency transmission between the boundary routing nodes and the nodes of the first level of the routing topology. According to the specification of Wi-SUN network protocol stack, the frequency hopping time slot is divided into unicast time slot and broadcast time slot, when the wireless radio frequency node needs to communicate with the appointed radio frequency node, the wireless radio frequency node needs to be switched to the channel corresponding to the unicast time slot of the appointed node for communication according to the frequency hopping algorithm selected by the appointed node, and the wireless radio frequency node needs to be used in competition.
In existing Wi-SUN networks, the MAC sublayer's access to all channels operates using a contention access mode. All radio frequency nodes in the Wi-SUN FAN need to execute own frequency hopping actions according to the whole network reference time, time slot division, frequency band resources and a given frequency hopping algorithm (such as a direct hash algorithm) strictly according to own frequency hopping sequences, so that channels where boundary routing nodes in any time slot are located are fixed for radio frequency nodes in the first level of all routing topologies. If a radio frequency node of a first level of the routing topology wants to communicate with a border routing node in a certain time slot, it needs to calculate a listening channel where the border routing node is located in the time slot according to the MAC address of the border routing node, and then switch to a corresponding channel and attempt to communicate with the border routing node through a CCA (Clear Channel Assessment) mechanism.
For the boundary routing node, the channel is fixed in any time slot, so that the boundary routing node resides in the time slot of a certain channel, only one radio frequency node of the first level of the routing topology can perform session (data interaction) with the boundary routing node at a time, and only when the session is ended, the radio frequency nodes of the first level of other routing topologies can attempt to perform the next session with the boundary routing node. If the CCA evaluation fails, the session is deferred or the transmission fails due to possible noise in the environment. In addition, data transmitted by radio frequency may be collided by data transmitted by other radio frequencies, so that the opposite end receiving fails. When the Wi-SUN FAN needs to interact with the data with large flow rate in the external network, the data which needs to be forwarded through the radio frequency by the boundary routing node is particularly easy to cause congestion or packet loss, and the overall performance of the network is affected.
In summary, the prior art has the following disadvantages:
1. the transmission mechanism of the wireless radio frequency requires that all radio frequency nodes of the first level of the routing topology in the same unicast time slot must compete to acquire the use right of the channel and attempt to communicate with the boundary routing nodes.
2. The wireless radio frequency transmission is half duplex communication, and the communication rate and the utilization rate of communication time slots are not high. In addition, the wireless radio frequency communication is easily affected by environmental noise, and needs a CCA detection and CSMA back-off mechanism, which easily causes communication delay or communication failure.
3. According to the routing topology of the Wi-SUN FAN, when the nodes in the Wi-SUN FAN communicate with an external network, the data flowing in and out need to be forwarded through the boundary routing nodes by wireless radio frequency. Because the nodes of the first level of the routing topology need to compete for the monitored channels in the unicast time slots of the boundary routing nodes when communicating with the boundary routing nodes, the wireless radio frequency communication rate and the communication mechanism between the boundary routing nodes and the nodes of the first level of the routing topology become the bottleneck restricting the communication between the Wi-SUN FAN internal nodes and the external network.
4. The wireless radio frequency communication capability of the boundary routing nodes and the nodes of the first level of the routing topology is insufficient, so that the number of wireless nodes deployed in the WI-SUN FAN cannot be too large, otherwise, the scene that the WI-SUN FAN and the external network perform large-flow data interaction cannot be satisfied. In areas where the number of nodes is large and dense, such as densely populated towns, the node capacity limitation in WI-SUN FAN can only be solved by increasing the number of WI-SUN FAN. However, increasing the number of WI-SUN FAN not only increases the corresponding hardware cost, but also does not have a negotiation mechanism between WI-SUN FAN at present, so that the network behavior of each WI-SUN FAN is difficult to manage, and the mutual interference between different WI-SUN FAN is caused. In addition, more Wi-SUN FAN will increase the corresponding network management and maintenance costs.
Therefore, a new Wi-SUN network and an extension method are needed to solve the problem caused by insufficient wireless transmission capability of the radio frequency side of the boundary routing node when the Wi-SUN FAN communicates with an external network.
Disclosure of Invention
Based on the above-mentioned drawbacks and deficiencies of the prior art, it is an object of the present application to at least solve one or more of the above-mentioned problems of the prior art, in other words, to provide a Wi-SUN network and an extension method through wired virtual radio frequency transmission that meet one or more of the above-mentioned needs.
In order to achieve the aim of the application, the application adopts the following technical scheme:
in a first aspect, the present application provides a Wi-SUN network extension method through wired virtual radio frequency transmission, which is applied to a Wi-SUN network, and specifically includes the following steps:
s1, establishing wired connection of analog radio frequency transmission between a boundary route node and a plurality of route topology first layer radio frequency nodes, and taking each route topology first layer radio frequency node as a wireless access point for establishing radio frequency transmission with the radio frequency node;
s2, acquiring various wired communication protocols and quantity supported by the boundary routing node;
s3, acquiring various wired communication protocols and quantity supported by a plurality of radio frequency nodes of a first layer of routing topology;
s4, according to all the wired communication protocols and the number of the wired communication lines supported by the boundary routing nodes, the wired communication protocols are configured for the boundary routing nodes and the radio frequency nodes of the first layer of each routing topology.
As a preferred embodiment, the Wi-SUN network extension method of the present application through wired virtual radio frequency transmission further includes:
the method comprises the steps of obtaining the memory sizes of the boundary routing node and the radio frequency node of the first layer of the routing topology, obtaining the total routing information size of the radio frequency node connected with the radio frequency node of the first layer of the routing topology, and if the memory size of the boundary routing node or the radio frequency node of the first layer of the routing topology is insufficient, externally hanging DRAM for the boundary routing node or the radio frequency node of the first layer of the routing topology.
In a preferred embodiment, in step S1, establishing a wired connection between a border routing node and a plurality of radio frequency nodes of a first layer of a routing topology for simulating radio frequency transmission specifically includes the following steps:
s11, registering a virtual radio frequency PHY layer driver for the MAC layer of the boundary routing node;
s12, establishing wired connection of analog radio frequency transmission according to the virtual radio frequency PHY layer drive.
As a further preferred embodiment, the virtual radio frequency PHY layer driver transmits data to each of the routing topology first layer radio frequency nodes in a time-sharing manner when broadcasting the data frame, the data including a uniform broadcast transmission time and a time-sharing offset time.
As a further preferred embodiment, the virtual radio PHY layer driver is configured to provide radio related state control callbacks and radio extension callback virtual functions, virtual radio transceiving functions, and virtual radio MAC address writing and reading to the MAC layer of the Wi-SUN protocol stack.
As a preferred embodiment, the wired communication protocol includes SPI, UART, ETHERNET, USB, CAN.
In a second aspect, the present application also provides a Wi-SUN network system transmitted by wired virtual radio frequency, extended using a method as any one of the above;
the Wi-SUN network system transmitted by the wired virtual radio frequency specifically comprises: the boundary routing nodes and the plurality of routing topology first-layer radio frequency nodes establish wired connection for simulating radio frequency transmission, and each routing topology first-layer radio frequency node serves as a wireless access point for establishing radio frequency transmission with the radio frequency node.
As a preferred embodiment, the border routing node and the radio frequency node in the first layer of the routing topology plug-in DRAM.
As a preferred embodiment, the radio frequency nodes of the first layer of the routing topology are connected to the border routing nodes by SPI, UART, ETHERNET, USB or CAN protocol.
Compared with the prior art, the application has the beneficial effects that:
according to the Wi-SUN network and the extension method through the wired virtual radio frequency transmission, the boundary routing nodes and the radio frequency nodes of the first level of the routing topology are connected in a wired mode to conduct virtual radio frequency communication, data originally required to be forwarded by the boundary routing nodes through radio frequencies in the Wi-SUN FAN are reasonably sunk to the radio frequency nodes of the first level of the routing topology, namely, the data forwarded by the boundary routing nodes in a wireless radio frequency mode are distributed to the first-level radio frequency nodes of the routing topology, and the data at the confluence are transmitted through wired connection, so that the data throughput capacity and confluence transmission stability of the boundary routing nodes are improved, and the communication capacity of the Wi-SUN FAN and an external network is improved.
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Fig. 1 is a schematic diagram of a Wi-SUN network system for transmitting by wire virtual radio frequency according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.
In the following description, various embodiments of the application are provided, and various embodiments may be substituted or combined, so that the application is intended to include all possible combinations of the same and/or different embodiments described. Thus, if one embodiment includes feature A, B, C and another embodiment includes feature B, D, then the present application should also be considered to include embodiments that include one or more of all other possible combinations including A, B, C, D, although such an embodiment may not be explicitly recited in the following.
The following description provides examples and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements described without departing from the scope of the application. Various examples may omit, replace, or add various procedures or components as appropriate. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Furthermore, features described with respect to some examples may be combined into other examples.
One embodiment of the present application provides a Wi-SUN network extension method through wired virtual radio frequency transmission, which is applied to a Wi-SUN network, and specifically includes the following steps:
s1, establishing wired connection of analog radio frequency transmission between a boundary route node and a plurality of route topology first layer radio frequency nodes, and taking each route topology first layer radio frequency node as a wireless access point for establishing radio frequency transmission with the radio frequency node;
s2, acquiring various wired communication protocols and quantity supported by the boundary routing node;
s3, acquiring various wired communication protocols and quantity supported by a plurality of radio frequency nodes of a first layer of routing topology;
s4, according to all the wired communication protocols and the number of the wired communication lines supported by the boundary routing nodes, the wired communication protocols are configured for the boundary routing nodes and the radio frequency nodes of the first layer of each routing topology.
The method first selects a wired communication protocol (UART, SPI, ETHERNET, USB, CAN, etc.) supported by the boundary routing node and the radio frequency nodes of the first level of the routing topology through steps S2 and S3, and determines the number of radio frequency nodes of the first level of the routing topology to be used. And then, associating the hardware channel of the selected communication mode with the radio frequency node of the first level of the corresponding routing topology to form a primary network topology with fixed network.
Wherein the selected wired communication protocol must be commonly supported by both the border routing node and the radio frequency nodes of the first level of the routing topology. The hardware channels of the second selected wired communication protocol must be exclusive to the radio frequency nodes of the first level of each routing topology.
Assuming that the boundary routing node supports 5 paths of UART,3 paths of SPI,2 paths of ETHERNET and 2 paths of USB; assume that the first level of radio nodes of the deployed routing topology are 6 and all support UART and SPI, but not ETHERNET and USB. For the radio frequency nodes of the first level of the 6 routing topologies, 5 radio frequency nodes can be selected to communicate with the boundary routing nodes by adopting UART, and 1 radio frequency node can communicate with the boundary routing nodes by adopting SPI; or 3 UART communication nodes and 3 SPI communication nodes.
In addition, when the wired connection is established in step S1 and the wired communication protocol is configured in step S4, hardware driving of the communication protocol selected by the node is first implemented. For example, for SPI communication, the boundary routing node end always acts as a master, the radio frequency nodes of the first level of the routing topology always act as slaves, and each radio frequency node of the first level of the routing topology needs an external interrupt pin to be used as a trigger notification for communication with the boundary routing node.
The wired communication protocol described above includes SPI, UART, ETHERNET, USB, CAN.
Further, in step S1 of the above method, establishing a wired connection between the border routing node and a plurality of radio frequency nodes of the first layer of routing topology for simulating radio frequency transmission specifically includes the following steps:
s11, registering a virtual radio frequency PHY layer driver for the MAC layer of the boundary routing node;
s12, establishing wired connection of analog radio frequency transmission according to the virtual radio frequency PHY layer drive.
Because the wired communication between the boundary routing node and the radio frequency node of the first level of the routing topology has the characteristic of simulating radio frequency transmission in the method, the MAC layer is required to register the virtual radio frequency PHY layer driver, and then the wired connection simulating radio frequency transmission is established according to the virtual radio frequency PHY layer driver. Specifically, this virtual radio frequency PHY layer driver includes the following functions:
1. the PHY layer driver has a timer with a resolution of one microsecond providing a 32-bit global timestamp value for the protocol stack for full network reference time and time synchronization of the protocol stack MAC layer.
2. The PHY driving structure includes members including PHY connection type, band information, MAC address information, and PHY MTU size information.
3. PHY state control, including related operations of the PHY layer (e.g., reset, on, off, etc.); a given radio frequency configuration, mainly frequency band related parameters; ED (energy detection), the ED result read by the virtual PHY is always optimal by default, namely, the channel is considered to be noiseless and available; analog channel switching; virtual transmit power settings; virtual ACK acknowledgement suspension configuration; returning the symbol rate in terms of symbols per second; global time acquisition, etc.
4. In terms of reception: the PHY layer driver stores a timestamp of the received data packet, where the time references the first byte of the received frame. In addition, the RSSI (signal quality) and LQI (link quality) of the received frame are filled with optimal values by default.
5. In terms of transmission: the CCA mode of the PHY layer drive read storage is always false, and the drive does not do CCA check and proceeds with the next operation, i.e. the default channel is available, without using CSMA backoff mechanism.
6. Virtual broadcasting: when the boundary routing node transmits the broadcast data frame, the boundary routing node needs to transmit data to the connection channels of the radio frequency nodes of the first level of the routing topology in a time sharing way, and because the initial transmission time of each channel transmitted in the time sharing way has deviation, the boundary routing node needs to transmit the uniform broadcast transmission time and the offset time information when each channel transmits the broadcast to the radio frequency nodes of the first level of the routing topology so as to ensure that the reference time is accurately uniform. Assume that there are three radio nodes in the FAN at the first level of the routing topology, N1, N2, N3, respectively. The start time stamps of the data frames sent by the boundary routing nodes to N1, N2 and N3 are T1, T2 and T3 respectively, and T1< T2< T3. The data frame transmitted to each channel needs to include a start time stamp Tn (T1, T2, T3) and a uniform broadcast time T0 (t0=t1) when the data frame is transmitted.
According to the method, the data originally required to be forwarded to the boundary routing node through the radio frequency in the Wi-SUN FAN are forwarded to the radio frequency node of the first level of the routing topology only through the radio frequency, and then the data are forwarded to the boundary routing node through the mode of wired connection virtual radio frequency communication. The communication mode between the boundary route node and the route topology primary node is changed from the original wireless radio frequency mode transmission to wired communication, and the data which is originally required to be forwarded by the boundary route node in the network topology by radio frequency is reasonably sunk to the route topology primary node through the wired connection virtual radio frequency communication, so that the pressure of the radio frequency transmission of the boundary route node is dispersed.
Meanwhile, the method for changing the communication mode between the boundary routing node and the first-level node of the routing topology from the original wireless radio frequency mode transmission to the wired communication has the following advantages:
the wired transmission has flexible communication modes (UART, SPI, ETHERNET, USB, CAN, etc.), supports full duplex, faster speed and higher stability, and each channel is exclusive and does not need CCA check, CSMA back-off, etc. before transmission. The radio frequency nodes and the boundary routes of the first level of each routing topology have respective wired transmission channels, the problem of mutual interference does not exist during data transmission of each channel, CCA detection is not needed before transmission, the time slot utilization rate is high, and parallel transmission among the channels can be realized. The throughput capacity of communication on the upper side and the lower side of the boundary routing node is increased, the stability of transmission is enhanced, and the problem of data congestion caused by insufficient wireless radio frequency transmission capacity of the boundary routing node is solved.
In addition, the communication capability of the boundary routing nodes of the WI-SUN FAN and the radio frequency nodes of the first level of the routing topology can be enhanced by a mode of wire transmission virtual radio frequency communication, the deployment quantity of the FANs can be reduced for areas with large and dense node quantity, and meanwhile, the interference among different FANs and the management maintenance cost are also reduced. By reducing the interference, the method of the application can further increase the number of the deployment of the wireless radio frequency nodes in the Wi-SUN FAN, so that as many nodes as possible are cooperatively managed in the same Wi-SUN FAN, and the mutual interference among the Wi-SUN FANs caused by excessive Wi-SUN FANs is avoided.
Assuming that the boundary routing node supports 5 paths of UART,3 paths of SPI,2 paths of ETHERNET and 2 paths of USB; assume that the first level of radio nodes of the deployed routing topology are 6 and all support UART and SPI, but not ETHERNET and USB. For the radio frequency nodes of the first level of the 6 routing topologies, 5 radio frequency nodes can be selected to communicate with the boundary routing nodes by adopting UART, and 1 radio frequency node can communicate with the boundary routing nodes by adopting SPI; or 3 UART communication nodes and 3 SPI communication nodes.
As a preferred embodiment, the Wi-SUN network extension method of the present application through wired virtual radio frequency transmission further includes:
the memory sizes of the boundary routing nodes and the radio frequency nodes of the first layer of the routing topology are obtained, the routing information size of the radio frequency nodes is obtained, and if the memory sizes of the boundary routing nodes or the radio frequency nodes of the first layer of the routing topology are insufficient, the boundary routing nodes or the radio frequency nodes of the first layer of the routing topology are the external DRAM.
The embodiment also provides a specific implementation example of the method, and supposing that in a dense area where 5000 radio frequency nodes need to be deployed, due to the limitation of the radio frequency side transmission capability of the boundary routing node of the existing Wi-SUN FAN, the deployment node needs to be divided into a plurality of different FAN. Only one Wi-SUN FAN needs to be divided by the method of the application. The specific implementation is as follows: NXP I.MXRT 1170 is selected as a main control chip, microchip AT86RF215M is selected as a Sub-1GHz wireless transceiver, mb-OS is selected as a software platform integration (Wi-SUN protocol stack), and the wireless transceiver adopts FSK 50kbps for communication.
The radio frequency nodes of the first level of the routing topology are planned to be connected with the boundary routing nodes in a wired mode, and the radio frequency node plan of the first level of each routing topology can accommodate 1000 sub-nodes, namely the routing nodes which can serve as the sub-nodes of the second level of the 1000 routing topologies.
In this embodiment, the main control chip selected by the boundary routing node is NXP i.mxrt 1170, which has 2MB SRAM/TCM, 2-way ENET, 6-way SPI, 12-way UART, and a USB 2.0. According to the planning, the boundary routing node needs to store the routing information of all nodes in the Wi-SUN FAN, so that the boundary routing node needs to plug in a DRAM; the node of the radio frequency node of the first level of the routing topology needs to store 1000 pieces of child node neighbor information, the size of each piece of neighbor node information is about 1K, the occupied memory of 1000 pieces of nodes is about 1M, and a plug-in DRAM is not needed. The other-level neighbor table tentative capacity is 1000.
The radio frequency nodes and border routing nodes of the first level of the routing topology may be connected using SPI, UART, ETHERNET, USB or CAN protocols. Because the rate used by the AT86RF215M wireless transceiver is 50kpbs, in order to fully consider the communication situation when a large amount of high-density data is sent, in this implementation, all the radio frequency nodes of the first level of the 5 routing topology and the boundary routing nodes are directly connected by wires, that is, the 1 st to 5 th LPSPIs of the boundary routing nodes are connected with the 1 st LPSPIs of the radio frequency nodes of the first level of the 5 routing topology, and a GPIO pin is additionally added to each channel as a slave node of the SPI (the radio frequency node of the first level of the routing topology) to actively trigger the SPI master node (the boundary routing node) to communicate, the SPI communication rate is set to 10mbps, the LPSPIs use an interrupt mode to send and receive, the first 2 bytes of each frame need to include the length information of the current frame, and the global 32-bit microsecond timestamp when the first byte of each frame is received needs to be recorded for time synchronization and calibration of the Wi-SUN protocol stack.
GPT (General Purpose Timer) using NXP i.mxrt 1170 is used to implement us_tick under Mbed-OS as a Wi-SUN protocol stack global microsecond timestamp for time slot synchronization and clock reference at the MAC layer.
The virtual radio frequency PHY driver is encapsulated based on the LPSPI driver and registered as an IEEE 802.15.4RF driver for Mbed-OS. The virtual radio PHY driver provides the MAC layer of the Wi-SUN protocol stack with radio related status control callbacks and radio expansion callbacks (including band setting, channel switching, transmit power, ED, CCA mode, etc. related) virtual functions, virtual radio transceiving functions, and virtual radio MAC address writing and reading.
After the Wi-SUN network is expanded in the mode, virtual radio frequency driving is realized on the SPI communication mode by the boundary routing node and the radio frequency nodes of the first level of the routing topology, corresponding IEEE 802.15.4RF driving is registered to the MAC layer of the Wi-SUN protocol stack, and Wi-SUN FAN networking is completed according to the virtual radio frequency driving relied on by the Wi-SUN protocol stack. Because the radio frequency nodes of the first level of the routing topology and the boundary routing nodes are in SPI communication in fact, the data of the radio frequency side is changed from the original collection to the boundary nodes to the collection to the radio frequency nodes of the first level of the 5 routing topologies, and the radio frequency sides of the radio frequency nodes of the first level of the 5 routing topologies all have respective independent frequency hopping sequences and can be mutually and parallelly transmitted and received without being influenced. Therefore, the data of the radio frequency side in the original Wi-SUN FAN are converged to the boundary route nodes and are converted to the radio frequency nodes of the first level of 5 route topology, the pressure of the boundary route nodes is relieved, the communication capacity of the Wi-SUN FAN and an external network is improved, and the capacity of the network is further improved.
In a second aspect, the present application also provides a Wi-SUN network system transmitted by wired virtual radio frequency, extended using the method as in the above embodiment.
The application relates to a Wi-SUN network system transmitted by a wired virtual radio frequency, the structure schematic diagram of which is shown in figure 1, which comprises the following steps: the boundary routing nodes and the plurality of routing topology first-layer radio frequency nodes establish wired connection for simulating radio frequency transmission, and each routing topology first-layer radio frequency node serves as a wireless access point for establishing radio frequency transmission with the radio frequency node.
The boundary route node and the radio frequency node of the first layer of the route topology are used for hanging DRAM according to the total memory required by the connection node.
In a specific embodiment, the radio frequency nodes of the first layer of the routing topology are connected with the boundary routing nodes through SPI protocol.
It should be noted that, for simplicity of description, the foregoing method embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present application is not limited by the order of acts described, as some steps may be performed in other orders or concurrently in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present application.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The foregoing is merely exemplary embodiments of the present disclosure and is not intended to limit the scope of the present disclosure. That is, equivalent changes and modifications are contemplated by the teachings of this disclosure, which fall within the scope of the present disclosure. Embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a scope and spirit of the disclosure being indicated by the claims.
Claims (9)
1. A Wi-SUN network expansion method through wired virtual radio frequency transmission is applied to a Wi-SUN network, and is characterized by comprising the following steps:
s1, establishing wired connection of a boundary route node and a plurality of route topology first layer radio frequency nodes for simulating radio frequency transmission, and taking each route topology first layer radio frequency node as a wireless access point for establishing radio frequency transmission with the radio frequency node;
s2, acquiring various wired communication protocols and quantity supported by the boundary routing node;
s3, acquiring various wired communication protocols and quantity supported by the radio frequency nodes of the first layer of the routing topology;
s4, according to all the wired communication protocols and the number of the wired communication lines supported by the boundary routing nodes, the wired communication protocols are configured for the boundary routing nodes and each routing topology first-layer radio frequency node.
2. The Wi-SUN network extension method of claim 1, further comprising:
the memory sizes of the boundary routing node and the radio frequency node of the first layer of the routing topology are obtained, the total routing information size of the radio frequency node connected with the radio frequency node of the first layer of the routing topology is obtained, and if the memory size of the boundary routing node or the radio frequency node of the first layer of the routing topology is insufficient, the boundary routing node or the radio frequency node of the first layer of the routing topology is externally hung with a DRAM.
3. The Wi-SUN network extension method through wired virtual radio frequency transmission according to claim 1, wherein in the step S1, establishing wired connection of the boundary routing node and the plurality of radio frequency nodes of the first layer of the routing topology for simulating radio frequency transmission specifically comprises the following steps:
s11, registering a virtual radio frequency PHY layer driver for the MAC layer of the boundary routing node;
s12, establishing wired connection of analog radio frequency transmission according to the virtual radio frequency PHY layer driver.
4. A Wi-SUN network extension method according to claim 3, wherein the virtual radio PHY layer driver transmits data to each of the routing topology first layer radio nodes in a time-sharing manner when broadcasting a data frame, the data including a uniform broadcast transmission time and a time-sharing offset time.
5. The Wi-SUN network extension method of claim 3, wherein the virtual radio PHY layer driver is configured to provide radio related state control callbacks and radio extension callback virtual functions, virtual radio transceiving functions, and virtual radio MAC address writing and reading to a MAC layer of a Wi-SUN protocol stack.
6. The Wi-SUN network extension method of claim 1, wherein the wired communication protocol comprises SPI, UART, ETHERNET, USB, CAN.
7. A Wi-SUN network system transmitted by wired virtual radio frequency, characterized by being extended using the method of any of claims 1-6;
the Wi-SUN network system through the wired virtual radio frequency transmission specifically comprises: the boundary routing nodes and the routing topology first layer radio frequency nodes establish wired connection for simulating radio frequency transmission, and each routing topology first layer radio frequency node serves as a wireless access point for establishing radio frequency transmission with the radio frequency node.
8. The Wi-SUN network system of claim 7, wherein the border routing node and the routing topology first layer radio nodes plug-in DRAM.
9. The Wi-SUN network system of claim 7, wherein the routing topology first layer rf nodes are connected to the border routing nodes via SPI, UART, ETHERNET, USB or CAN protocol.
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