CN112333018A - Networking method for improving Wi-SUN network bandwidth and Wi-SUN network thereof - Google Patents
Networking method for improving Wi-SUN network bandwidth and Wi-SUN network thereof Download PDFInfo
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- H—ELECTRICITY
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Abstract
The invention discloses a networking method for improving the bandwidth of a Wi-SUN network and the Wi-SUN network thereof, relating to the technical field of the Internet of things and comprising the following steps: configuring network parameters of the Wi-SUN network, starting all network nodes and non-network-accessing nodes, sending PAN broadcast frames, retrieving the network nodes capable of establishing connection after the non-network-accessing nodes receive the PAN broadcast frames, establishing connection with the network nodes, joining the Wi-SUN network, and performing network configuration. The method provided by the invention has the advantages of large-scale high bandwidth and good communication quality.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of Internet of things, in particular to a networking method for improving the bandwidth of a Wi-SUN network and the Wi-SUN network.
[ background of the invention ]
Wi-SUN is a Mesh network protocol, each equipment node in the network can communicate with adjacent equipment nodes, route forwarding between the adjacent nodes enables each node in the network to carry out very long-distance jumping, and the Mesh network and active frequency hopping capability is achieved. With the popularization of the Wi-SUN technology, the Wi-SUN has great potential in the field of Internet of things. However, Wi-SUN is a mesh network with a single rate, and when a lower rate is used, the network bandwidth may be limited, and the network bandwidth may affect the network delay and the network scale; when a higher rate is used, inter-node communication with poor link quality may affect the communication distance and the communication success rate. At present, a Wi-SUN network adopts an FSK modulation mode, the supported rate is only 300kbp at most, and in practical application, all nodes which are not accessed to the network can be enabled to access to the network normally, so that nodes which are not accessed to the network and have poor communication link quality need to be considered in the network, and a better communication effect can be ensured by using a lower communication rate. The limitation of single rate makes this situation a bottleneck that restricts the rate of the whole network, and greatly affects the bandwidth of the whole network. When the network scale is large, selecting a low communication rate can prolong the response time of the server, and in addition, using a low rate in a large-scale network can increase the probability of data collision, thereby increasing the difficulty of network time management. Therefore, providing a Wi-SUN network with both large-scale high bandwidth and good communication quality is a problem that must be faced by current Wi-SUN networks.
[ summary of the invention ]
In order to solve the problems, the invention provides a networking method for improving the bandwidth of the Wi-SUN network, which considers large-scale high bandwidth and has good communication quality.
In order to achieve the purpose, the invention adopts the following technical scheme:
a networking method for improving the bandwidth of a Wi-SUN network comprises an accessed node, is used for bringing an un-accessed node needing to be added into the Wi-SUN network, selects a communication rate according to the link quality condition of the node which is acquired in the process of adding the node into the Wi-SUN network and is communicated with the accessed node in the Wi-SUN network, and establishes connection with the accessed node in the Wi-SUN network, and comprises the following steps:
configuring network parameters of a Wi-SUN network, starting the Wi-SUN network, sending a PAN broadcast frame by a network-accessed node (initially a border router), searching the network-accessed node which can establish connection and establishing connection with the network-accessed node after a non-network-accessed node receives the PAN broadcast frame sent by the network-accessed node so as to join the Wi-SUN network, and performing network configuration after joining the Wi-SUN network.
Optionally, when the Wi-SUN network is added, the establishment of the routing topology is completed through an RPL protocol; after the non-network-accessing node is added into the network and network configuration is carried out, the communication rate between the non-network-accessing node and the adjacent network-accessing node is configured according to the rssi of the adjacent network-accessing node.
Optionally, the routing topology includes an uplink route and a downlink route, and during the uplink route, the network-accessed node selects an optimal parent node of the network-accessed node from all other network-accessed nodes adjacent to the network-accessed node, and configures an uplink communication rate between the network-accessed node and the optimal parent node according to the rssi of the selected optimal parent node.
Optionally, during downlink routing, the optimal parent node configures, according to the rssi of the network-accessed node adjacent to the optimal parent node, a downlink communication rate between the optimal parent node and the network-accessed node adjacent to the optimal parent node.
Optionally, when the optimal father node is selected, based on an RPL protocol, calculating rank values of all other network-accessed nodes adjacent to the network-accessed node according to the level ordinal and the rssi of the network-accessed node, and using the network-accessed node with the smallest rank value as the optimal father node.
Optionally, all nodes in the Wi-SUN network send PAN broadcast frames at the broadcast channel at the lowest communication rate.
Optionally, the non-network-accessing node that does not receive the PAN broadcast frame sent by the network-accessing node sends a PAN broadcast frame request frame to the network-accessing node, and after receiving the PAN broadcast frame request frame sent by the non-network-accessing node, the network-accessing node sends the PAN broadcast frame to the non-network-accessing node that sends the PAN broadcast frame request frame.
Optionally, all non-network-accessing nodes in the Wi-SUN network send PAN broadcast frame request frames at the broadcast channel at the lowest communication rate.
Optionally, the non-network-accessing node searches the network-accessing node which can establish the connection through a key authentication mode and establishes the connection with the network-accessing node.
Optionally, the key authentication between the non-networked node and the networked node uses an 802.1X protocol.
Optionally, the Wi-SUN network has a PANID and a network name, and the PAN broadcast frame sent by the network-connected node includes the PANID and the network name of the Wi-SUN network.
Optionally, configuring the network parameters of the Wi-SUN network includes:
configuring a modulation mode of the Wi-SUN network as an OFDM mode;
configuring PHY option of an OFDM mode of the Wi-SUN network as option2 and sensitivity and data rate which can be achieved by different modulation schemes corresponding to option 2;
configuring a communication rate mapping relation corresponding to the rssi of each accessed node in the Wi-SUN network;
and configuring the lowest communication rate of the Wi-SUN network.
Optionally, when each network-accessed node in the Wi-SUN network communicates with an adjacent network-accessed node, the network-accessed node acquires an rssi of the adjacent network-accessed node, and adjusts a communication rate between the network-accessed node and the adjacent network-accessed node according to a communication rate mapping relationship corresponding to the rssi.
Optionally, each of the networked nodes in the Wi-SUN network and the neighboring networked nodes communicate at the unique channel at a variable communication rate.
The invention has the following beneficial effects:
according to the technical scheme, the communication rate between the nodes which have accessed the network is adjusted through the rssi value between the adjacent nodes, so that the network bandwidth can be increased, the probability of data collision is reduced, the robustness and robustness of the whole network are enhanced, the time delay can be reduced, the probability of data collision is reduced, and the network scale is increased; meanwhile, the problem of network data collision caused by long network communication time occupied by low communication speed can be reduced. On the other hand, flexible rate selection does not cause poor communication power due to poor link quality using high rates.
In addition, the invention also provides a Wi-SUN network, wherein the Wi-SUN network is networked by any one of the networking methods for improving the bandwidth of the Wi-SUN network.
The beneficial effect of the Wi-SUN network provided by the invention is similar to the beneficial effect reasoning process of the networking method of the Wi-SUN network, and the reasoning process is not repeated herein.
These features and advantages of the present invention will be disclosed in more detail in the following detailed description of the invention. The best mode or means of the present invention will be described in detail, but the present invention is not limited thereto. In addition, each of these features, elements and components appearing hereinafter is a plurality and different symbols or numerals are labeled for convenience of representation, but all represent components of the same or similar construction or function.
[ detailed description ] embodiments
The technical solutions of the embodiments of the present invention are explained and illustrated below, but the following embodiments are only preferred embodiments of the present invention, and not all of them. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
Reference in the specification to "one embodiment" or "an example" means that a particular feature, structure or characteristic described in connection with the embodiment itself may be included in at least one embodiment of the patent disclosure. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.
Example one
The embodiment provides a networking method for improving the bandwidth of a Wi-SUN network, wherein the Wi-SUN network comprises a network-accessed node, namely a boundary route, a routing node and a leaf node, has a PANID and a Wi-SUN network name, and is configured or generated by the boundary route of the network-accessed node. The routing node is an accessed network node with routing forwarding capability; the leaf node is the network-accessed node without the routing forwarding capability. Hardware aspect: the AT86RF215M chip using ATMEL has multi-rate and multi-region frequency shift keying (MR-FSK), orthogonal frequency division multiplexing (MR-OFDM), and offset quadrature phase shift keying (MR-O-QPSK) and receive rate adaptation capabilities. Software aspect: the method is characterized in that the method uses mbed-os which is open source by arm company, follows Apache-2.0 protocol, an application layer is developed in c + +, and a core layer is packaged with RTOS and a network protocol stack, wherein the network protocol stack comprises a Wi-SUN protocol stack and supports FSK modulation mode.
The networking method for improving the bandwidth of the Wi-SUN network provided by the embodiment is used for bringing the non-network-accessing node which needs to be added into the Wi-SUN network, and selecting an appropriate rate according to the link quality condition obtained in the process of adding the networking method into the Wi-SUN network when the networking method communicates with the node in the Wi-SUN network, namely the network-accessing node and/or the non-network-accessing node, so as to establish a connection with the network-accessing node in the Wi-SUN network, and comprises the following steps:
configuring network parameters of the Wi-SUN network, which specifically comprises the following steps:
configuring the modulation mode of the Wi-SUN network as an OFDM mode, wherein when the OFDM modulation mode is adopted, seven different rates can be provided by different modulation schemes (MCS) under the same PHY option at most, and the rate range can be from 50Kbps to 2.4 Mbps;
the modulation mode of the Wi-SUN network is option2, and the sensitivity and data rate that can be achieved under different modulation schemes corresponding to option2 are shown in table 1:
the option2 in the OFDM modulation mode of the AT86RF215M radio frequency chip is selected, on one hand, the lowest rate can reach the lowest 50Kbps, and the range of one-hop transmission is enlarged; meanwhile, the maximum rate can reach 1.2Mbps, and the network bandwidth can be effectively increased, so that the option2 can ensure the necessary communication quality while the communication rate is improved.
Configuring a communication rate mapping relation corresponding to the rssi of each network-accessed node in the Wi-SUN network, as shown in Table 2:
| MCS | speed[kb/s] | rssi[dBm] |
| 0 | 50 | -84～-72 |
| 1 | 100 | -71～-60 |
| 2 | 200 | -59～-48 |
| 3 | 400 | -47～-36 |
| 4 | 600 | -35～-24 |
| 5 | 800 | -23～-12 |
| 6 | 1200 | -11～0 |
the lowest communication rate of the Wi-SUN network is configured, specifically, in this embodiment, the lowest communication rate, i.e., MCS0, corresponds to 50 Kpbs.
After the network parameters are configured, the network-accessed node of the WI-SUN network is started, the network-accessed node sends a PAN broadcast frame at the lowest communication rate, namely 50Kbps, in the broadcast channel, and notifies the effective non-network-accessed node to join the network. The transmission range between one hop can be increased by transmitting at the lowest rate, so that the condition that nodes which are not accessed to the network cannot be accessed to the network due to poor link quality is avoided. The PAN broadcast frame sent by the network-accessed node comprises the PANID and the network name of the Wi-SUN network. After receiving the PAN broadcast frame sent by the accessed node, the non-accessed node searches the accessed node which can establish connection in a key authentication mode and establishes connection with the accessed node so as to join the Wi-SUN network. The key authentication between the non-networked node and the networked node uses the 802.1X protocol. If the non-network-accessing node does not receive the PAN broadcast frame sent by the network-accessing node for a long time, the non-network-accessing node is in a non-network state for a long time, therefore, the non-network-accessing node sends a PAN broadcast frame request frame to the network-accessing node, and after the network-accessing node receives the PAN broadcast frame request frame sent by the non-network-accessing node, the network-accessing node sends the PAN broadcast frame to the non-network-accessing node sending the PAN broadcast frame request frame. The PAN broadcast frame request frame is also transmitted at the lowest communication rate in the broadcast channel. And after the non-network-accessing node receives the PAN broadcast frame, reading the rssi corresponding to the network-accessing node which sends the PAN broadcast frame, and storing the read rssi and the corresponding network-accessing node in a neighbor node table of the non-network-accessing node.
When the Wi-SUN network is added, the establishment of the routing topology is completed through an RPL protocol; and synchronously completing communication rate configuration in the process that the node which is not accessed to the network joins the Wi-SUN network. The network-accessed node configures the communication rate with the adjacent routing node according to the rssi of the adjacent routing node, and the routing topology comprises an uplink route and a downlink route:
during uplink routing, because the optimal father node to be selected is always in the neighbor node table of the accessed network node, the accessed network node selects the optimal father node of the accessed network node from all the routing nodes adjacent to the accessed network node, and configures the uplink communication rate between the accessed network node and the optimal father node of the accessed network node according to the rssi of the selected optimal father node, namely, the communication rate matched with the rssi is selected according to the table 2 to be used as the uplink communication rate between the accessed network node and the optimal father node.
During downlink routing, because the child node is also in the neighbor node table of the optimal parent node, the optimal parent node configures the downlink communication rate between the optimal parent node and the network-accessed node of the child node according to the rssi of the child node, namely, the communication rate matched with the rssi is selected according to the table 2 to be used as the downlink communication rate between the optimal parent node of the network-accessed node and the child node.
And the optimal father node is selected based on an RPL (resilient packet layer) protocol, all the network-accessed node rank values adjacent to the nodes which are not accessed to the network are calculated according to the level ordinal and the rssi of the routing node, and the routing node with the minimum rank value is used as the optimal father node.
After the accessed nodes join the accessed nodes of the Wi-SUN network, each accessed node and the adjacent accessed nodes communicate in the unicast channel at a variable communication rate. All the networked nodes in the network send PAN broadcast frames and PAN Configuration broadcast frames at intervals, and since the network link may change with time, the networked nodes update the rssi of the networked nodes with which they communicate through the received broadcast. In addition, in order to ensure that the selected communication rate can achieve a better communication success rate, the accessed nodes need to continuously count the communication success rate of data frames which are interacted with the adjacent uplink and downlink accessed nodes and need to respond within a period of time. If the communication success rate is low and the packet loss rate is increased within a period of time, which indicates that the communication quality is worse, the communication rate is properly reduced to compensate the communication success rate; if the communication success rate is high and the packet loss rate is increased within a period of time, which indicates that the communication success rate is improved more and more, the current communication rate can be maintained or the communication rate can be properly increased. Therefore, the networked node needs to continuously collect the rssi value in the broadcast frame of the neighboring networked node around and re-evaluate the new communication rate according to the communication condition in a period of time. The network node is accessed. The communication rate between the nodes which have accessed the network is adjusted through the rssi value between the adjacent nodes and the communication success rate, so that the network bandwidth can be effectively improved, and the problem of network data collision caused by long network communication time occupied by the slow communication rate can be reduced. On the other hand, the flexible rate selection can not cause the problem of poor communication power caused by poor link quality and high rate, thereby ensuring the stability of the network.
The technical scheme provided by the embodiment can not only increase the network bandwidth, reduce the probability of data collision, enhance the robustness and robustness of the whole network, but also reduce the time delay, reduce the probability of data collision and increase the network scale.
Example two
The Wi-SUN network provided by this embodiment is networked by the networking method of the Wi-SUN network described in the first embodiment, or performs communication rate adjustment.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in other forms without departing from the spirit or essential characteristics thereof. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (15)
1. The networking method for improving the bandwidth of the Wi-SUN network is characterized in that the Wi-SUN network comprises accessed nodes, the networking method for improving the bandwidth of the Wi-SUN network is used for bringing non-accessed nodes needing to be added into the Wi-SUN network, and selecting a communication rate according to the link quality situation of the nodes needing to be added into the Wi-SUN network and communicating with the accessed nodes in the Wi-SUN network, and establishing connection with the accessed nodes in the Wi-SUN network, wherein the networking method comprises the following steps:
configuring network parameters of the Wi-SUN network, starting the Wi-SUN network, sending a PAN broadcast frame by a network-accessed node, retrieving the network-accessed node which can establish connection and establishing connection with the network-accessed node after the network-inaccessible node receives the PAN broadcast frame sent by the network-accessed node so as to join the Wi-SUN network, and performing network configuration after joining the Wi-SUN network.
2. The networking method for improving the bandwidth of the Wi-SUN network according to claim 1, wherein when joining the Wi-SUN network, the establishment of the routing topology is completed through an RPL protocol; after the non-network-accessing node is added into the network and network configuration is carried out, the communication rate between the non-network-accessing node and the adjacent network-accessing node is configured according to the rssi of the adjacent network-accessing node.
3. The networking method for improving the bandwidth of the Wi-SUN network according to claim 2, wherein the routing topology includes an uplink route and a downlink route, and when the uplink route is performed, the accessed node selects an optimal parent node of the accessed node from all other accessed nodes adjacent to the accessed node, and configures the uplink communication rate between the accessed node and the optimal parent node according to the rssi of the selected optimal parent node.
4. The networking method for improving the bandwidth of the Wi-SUN network according to claim 3, wherein during downlink routing, the optimal parent node configures the downlink communication rate between the optimal parent node and the neighboring network-accessed node according to the rssi of the neighboring network-accessed node.
5. The networking method for improving Wi-SUN network bandwidth as recited in claim 4, wherein when an optimal father node is selected, based on an RPL protocol, rank values of all other networked nodes adjacent to the networked node are calculated according to the level ordinal and rssi of the networked node, and the networked node with the smallest rank value is taken as the optimal father node.
6. The networking method for improving the bandwidth of the Wi-SUN network according to claim 1, wherein all the nodes that have accessed the network and the nodes that have not accessed the network in the Wi-SUN network send PAN broadcast frames at a broadcast channel at the lowest communication rate.
7. The networking method for increasing the bandwidth of a Wi-SUN network according to claim 6, wherein a non-network-accessing node that does not receive a PAN broadcast frame sent by a network-accessing node sends a PAN broadcast frame request frame to a network-accessing node, and after receiving the PAN broadcast frame request frame sent by the non-network-accessing node, the network-accessing node sends the PAN broadcast frame to the non-network-accessing node that sent the PAN broadcast frame request frame.
8. The networking method for improving the bandwidth of a Wi-SUN network according to claim 7, wherein all non-networked nodes in the Wi-SUN network send PAN broadcast frame request frames at a broadcast channel at the lowest communication rate.
9. The networking method for improving the bandwidth of the Wi-SUN network according to one of claims 1 to 8, wherein the non-network-accessing node retrieves and establishes a connection with a network-accessing node that can establish a connection by means of key authentication.
10. The networking method for improving the bandwidth of the Wi-SUN network of claim 9, wherein the key authentication between the non-networked node and the networked node uses an 802.1X protocol.
11. The networking method for improving the bandwidth of the Wi-SUN network according to one of claims 1 to 8, wherein the Wi-SUN network has a PANID and a network name, and the PAN broadcast frame sent by the network-accessing node includes the PANID and the network name of the Wi-SUN network.
12. The networking method for improving the bandwidth of the Wi-SUN network according to one of claims 1 to 8, wherein configuring the network parameters of the Wi-SUN network comprises:
configuring a modulation mode of the Wi-SUN network as an OFDM mode;
configuring PHY option of an OFDM mode of the Wi-SUN network as option2 and sensitivity and data rate which can be achieved by different modulation schemes corresponding to option 2;
configuring a communication rate mapping relation corresponding to the rssi of each accessed node in the Wi-SUN network;
and configuring the lowest communication rate of the Wi-SUN network.
13. The networking method for improving the bandwidth of a Wi-SUN network according to claim 12, wherein when each of the networked nodes in the Wi-SUN network communicates with an adjacent networked node, the networked node obtains an rssi of the adjacent networked node, and adjusts a communication rate between the networked node and the adjacent networked node according to a communication rate mapping relationship corresponding to the rssi.
14. The networking method for improving the bandwidth of the Wi-SUN network according to claim 13, wherein each of the networked nodes in the Wi-SUN network communicates with the neighboring networked nodes at a unique channel at a variable communication rate.
15. A Wi-SUN network, characterized in that, the Wi-SUN network is networked by the networking method for improving the bandwidth of the Wi-SUN network according to any one of claims 1 to 14.
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