CN111885507A - Sensing method of dual-medium converged communication network - Google Patents
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Abstract
The invention provides a perception method of a dual-medium converged communication network, relates to the technical field of communication, and mainly solves the technical problems of independent perception of two medium networks, insufficient utilization of channel resources and poor timeliness of service data transmission in the perception method of the dual-medium communication network. The invention is applied to a Mesh network with double-medium fusion, and comprises the following components: the network center node firstly completes the double-medium fusion communication networking; selecting a sensing node and a sensing path; constructing a dual-medium parallel sensing superframe, and broadcasting and sending beacons to a network in parallel through network sub-nodes; constructing a dual-medium serial sensing superframe, and alternately broadcasting and sending a beacon to a network through a sensing node; if the network sub-node which has joined the network receives the perception information, the network synchronization is completed; and if the network child node which does not join the network receives the sensing information, initiating a network access request according to the sensing information. Therefore, the invention has the characteristics of high efficiency, high transmission speed and high sensing capability.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a sensing method of a dual-medium converged communication network.
Background
The ubiquitous power internet of things connects power users and equipment thereof, power grid enterprises and equipment thereof, power generation enterprises and equipment thereof, suppliers and equipment thereof, and people and things, generates shared data, and serves the users, the power grid, the power generation, the suppliers and government society; the power grid is used as a hub, the platform and the sharing function are played, and a larger opportunity is created for the development of the whole industry and more market subjects, so that the value service is provided.
And the local communication network is an important component of the ubiquitous power Internet of things. The existing local communication network solutions mainly include: the system comprises a narrow-band carrier network, a wide-band power line carrier network, a micro-power wireless network, a narrow-band power line carrier and micro-power wireless dual-medium communication network, and a wide-band power line carrier and micro-power wireless dual-medium communication network. The network sensing is a key link of local communication network operation maintenance, is used for discovery of nodes of the whole network, synchronization of network time, sensing of link state change in the network and the like, can provide a good operation basis for establishment and maintenance of dual-medium communication network routing, network time synchronization and service data transmission, and is an important direction of current research.
In the prior art, a network sensing method is usually performed in a manner that a central node initiates the network sensing method, periodically transmits the network sensing method in a broadcast manner, and forwards the network sensing method by other nodes.
The broadband power line carrier network (HPLC network for short) performs network perception by sending beacons and collecting site discovery list messages, and comprises a central beacon, an agent beacon and a discovery beacon. Micropower wireless networks (RF networks for short) are typically network aware by broadcasting beacon frames and collection of neighbor lists. The dual-media communication network generally senses the RF path and the HPLC path separately because the transmission rates of the two paths are different from each other.
Therefore, in the existing network sensing method, the way of forwarding beacons by all network sub-nodes generates waste of channel resources; in the network sensing process, all beacons are transmitted in a designated beacon time slot, and the transmission of service data is influenced due to the long duration of the beacon time slot.
Disclosure of Invention
One of the purposes of the present invention is to provide a sensing method for a dual-media converged communication network, which solves the technical problems of independent sensing of two media networks, insufficient channel resource utilization, low sensing efficiency, and poor timeliness of service data transmission in the network operation and maintenance process of the prior art. Advantageous effects can be achieved in preferred embodiments of the present invention, as described in detail below.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention discloses a perception method of a dual-medium converged communication network, which is applied to a dual-medium converged Mesh network, wherein the dual-medium converged Mesh network comprises the following steps: the network node comprises a network central node, at least two node layers surrounding the network central node, and wireless channels and/or carrier channels between the network central node and network sub-nodes on the node layers and between the network sub-nodes; the perception method comprises the following steps:
the network center node broadcasts and sends an HPLC beacon and an RF beacon to network sub-nodes on a node layer to complete dual-medium fusion communication networking;
the network central node constructs a dual-medium parallel sensing superframe, and broadcasts and sends an HPLC beacon and an RF beacon in parallel so that all network sub-nodes forward the HPLC beacon and the RF beacon layer by layer in parallel, wherein the dual-medium parallel sensing superframe comprises parallel superframe wireless and parallel superframe carriers;
the network center node is arranged in a node layer and selects a sensing node and a sensing path; the network center node constructs a dual-medium serial sensing superframe, and alternately broadcasts and sends an HPLC beacon and an RF beacon so that the sensing node alternately forwards the HPLC beacon and the RF beacon, wherein the dual-medium serial sensing superframe comprises serial superframe wireless and serial superframe carriers;
if the network sub-node which has joined the network receives the perception information, the network synchronization is completed; wherein, the perception information is an HPLC beacon and an RF beacon;
and if the network child node which does not join the network receives the sensing information, initiating a network access request according to the sensing information.
Further, the network center node selects a sensing node and a sensing path in a node layer, and the method includes:
through communication networking, a network center node preliminarily acquires a first parent-child relationship graph of each layer of network child nodes, and selects a sensing node;
in a first parent-child relationship diagram of network child nodes from the Nth layer to the (N + 1) th layer, when the network child node of the Nth layer is connected with the most network child nodes in the (N + 1) th layer, the network child node of the Nth layer is a first sensing node of the Nth layer, wherein N represents the number of node layers, and N is more than or equal to 1;
the network center node records and stores the first sensing node of the Nth layer and the sensing path of the network sub-node of the N +1 th layer connected with the first sensing node of the Nth layer; in addition, a sensing path of a first sensing node at the Nth layer connected with a network child node at the (N + 1) th layer is removed from the first parent-child relationship graph, and then the network center node obtains a second parent-child relationship graph of the network child nodes from the Nth layer to the (N + 1) th layer;
in a second parent-child relationship diagram of the network child nodes from the nth layer to the (N + 1) th layer, when the network child node of the nth layer is connected with the most network child nodes in the (N + 1) th layer, the network child node is a second sensing node of the nth layer;
the network center node records and stores the second sensing node of the Nth layer and the sensing path of the network sub-node of the N +1 th layer connected with the second sensing node of the Nth layer; in addition, a sensing path of a second sensing node at the Nth layer connected with a network child node at the (N + 1) th layer is removed from the second parent-child relationship graph, so that the network center node obtains a third parent-child relationship graph of the network child nodes from the Nth layer to the (N + 1) th layer;
by analogy, after the screening of the network sub-node of the (N + 1) th layer is completed, the network center node completes recording and stores the sensing node of the (N) th layer and the sensing path of the network sub-node of the (N + 1) th layer connected with the sensing node of the (N + 1) th layer;
and the N +1 layer is a node layer which surrounds the outermost layer of the network center node.
Further, the network center node selects a sensing node and a sensing path in the node layer, and further includes:
after the network center node finishes recording and storing all sensing nodes of the Nth layer and sensing paths from the Nth layer to the (N + 1) th layer, starting to record and store the sensing nodes of the (N-1) th layer and the sensing paths from the (N-1) th layer to the Nth layer;
by analogy, when the network center node finishes recording and stores the sensing node on the node layer closest to the network center node, the network center node finishes selecting the sensing node and the sensing path.
Further, the serial superframe wirelessly comprises: a TDMA period and a CSMA period of serial superframe wireless, wherein the TDMA period of serial superframe wireless is connected with the CSMA period of serial superframe wireless;
a TDMA period of the serial superframe wireless for serially transmitted RF beacons;
and the CSMA period of the serial superframe is used for evaluating whether a wireless channel is idle or not so as to enable the wireless channel to carry out data transmission.
Further, the serial superframe carrier includes: a first CSMA period, a second CSMA period, and a TDMA period of a serial superframe carrier; one end of the TDMA time interval of the serial superframe carrier is connected with the first CSMA time interval, and the other end of the TDMA time interval of the serial superframe carrier is connected with the second CSMA time interval;
the first CSMA time period is used for sensing whether a carrier channel is idle or not so as to enable the carrier channel to carry out data transmission;
the TDMA period of the serial superframe carrier is used for serially transmitting the HPLC beacon;
and the second CSMA time period is used for sensing whether the carrier channel is idle or not so as to enable the carrier channel to carry out data transmission.
Further, the hub node constructs a dual-medium serial sensing superframe and alternately broadcasts and transmits the HPLC beacon and the RF beacon, so that the sensing node alternately forwards the HPLC beacon and the RF beacon, including:
firstly, in serial superframe wireless, a network center node and a sensing node send RF beacons, and then in serial superframe carriers, the network center node and the sensing node send HPLC beacons; or the like, or, alternatively,
firstly, the network center node and the sensing node send HPLC beacons in serial superframe carriers, and then the network center node and the sensing node send RF beacons in serial superframe radio.
Further, the parallel superframe wirelessly comprises: the TDMA time interval of the parallel superframe wireless is connected with the CSMA time interval of the parallel superframe wireless;
the TDMA periods of the parallel superframe radio for parallel transmitted RF beacons;
and the CSMA period of the parallel superframe is used for evaluating whether a wireless channel is idle or not so as to enable the wireless channel to carry out data transmission.
Further, the parallel superframe carriers include: the TDMA time interval of the parallel superframe carrier is connected with the CSMA time interval of the parallel superframe carrier;
the TDMA periods of the parallel superframe carriers are used for the parallel transmission of HPLC beacons;
and the CSMA period of the parallel superframe carrier is used for sensing whether a carrier channel is idle or not so as to enable the carrier channel to carry out data transmission.
Further, the dual media parallel sensing superframe comprises a plurality of time frames and a short time frame; the time frame includes parallel superframe wireless and parallel superframe carriers, and the short time frame includes one TDMA period of the parallel superframe wireless and one TDMA period of the parallel superframe carrier.
Furthermore, the invention also comprises a sensing period, wherein the sensing period comprises a dual-medium parallel sensing superframe and a plurality of dual-medium serial sensing superframes.
The perception method of the dual-medium converged communication network provided by the invention at least has the following beneficial technical effects:
the invention designs a sensing method of a dual-medium converged communication network by utilizing the Mesh network topological structure characteristic of the dual-medium converged communication network, aiming at the problems of the prior art that service data cannot be transmitted and a large number of nodes forward beacons to cause channel resource waste in the network sensing process. The invention comprises the following steps: the network center node broadcasts and sends an HPLC beacon and an RF beacon to network sub-nodes on a node layer to complete dual-medium fusion communication networking; further, a network center node constructs a dual-medium parallel sensing superframe, and broadcasts and sends the HPLC beacon and the RF beacon in parallel, so that all network sub-nodes forward the HPLC beacon and the RF beacon layer by layer in parallel; furthermore, the network center node selects a sensing node and a sensing path in the node layer; and constructing a dual-medium serial sensing superframe by the central node of the network, and alternately broadcasting and transmitting beacons so that the sensing node alternately forwards the HPLC beacon and the RF beacon.
If the network sub-node which has joined the network receives the perception information, the network synchronization is completed; wherein, the perception information is an HPLC beacon and an RF beacon; and if the network child node which does not join the network receives the sensing information, initiating a network access request according to the sensing information.
The sensing period of the invention consists of a dual-medium parallel sensing superframe and a plurality of dual-medium serial sensing superframes, the problems of the prior sensing technology can be solved, the sensing efficiency of the dual-medium communication network is improved, and the transmission of service data is ensured in the network sensing process.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a Mesh network with dual-media fusion;
FIG. 2 is a flow chart of a sensing method of the dual media converged communication network of the present invention;
FIG. 3 is a flow chart of the present invention for screening sensing nodes and sensing paths;
FIG. 4 is a block diagram of a dual-media serial-aware superframe according to the present invention;
FIG. 5 is a schematic diagram of the structure of a dual-media parallel sensing superframe according to the present invention;
FIG. 6 is a schematic diagram of the sensing cycle of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Referring to fig. 1 and 2, the present invention is a sensing method for a dual-media converged communication network, which is applied to a dual-media converged Mesh network, where the dual-media converged Mesh network includes: the network node comprises a network central node, at least two node layers surrounding the network central node, and wireless channels and/or carrier channels between the network central node and network sub-nodes on the node layers and between the network sub-nodes; the perception method comprises the following steps:
s1: the network center node broadcasts and sends an HPLC beacon and an RF beacon to network sub-nodes on a node layer to complete dual-medium fusion communication networking;
s2: the network central node constructs a dual-medium parallel sensing superframe, and broadcasts and sends an HPLC beacon and an RF beacon in parallel so that all network sub-nodes forward the HPLC beacon and the RF beacon layer by layer in parallel, wherein the dual-medium parallel sensing superframe comprises parallel superframe wireless and parallel superframe carriers;
s3: the network center node is arranged in a node layer and selects a sensing node and a sensing path; the network center node constructs a dual-medium serial sensing superframe, and alternately broadcasts and sends an HPLC beacon and an RF beacon so that the sensing node alternately forwards the HPLC beacon and the RF beacon, wherein the dual-medium serial sensing superframe comprises serial superframe wireless and serial superframe carriers;
s41: if the network sub-node which has joined the network receives the perception information, the network synchronization is completed; wherein, the perception information is an HPLC beacon and an RF beacon;
s42: and if the network child node which does not join the network receives the sensing information, initiating a network access request according to the sensing information.
HPLC is a high-speed power line carrier, also called a broadband power line carrier, and is a broadband power line carrier technology for data transmission over a low-voltage power line. The broadband power line carrier communication network is a communication network which takes a power line as a communication medium and realizes the aggregation, transmission and interaction of the power utilization information of low-voltage power users. The HPLC beacon is a high speed powerline carrier beacon.
As shown in fig. 1, a Mesh network comprises a network center node CAC, a node layer surrounding the network center node CAC and network sub-nodes DAU on the node layer, radio channels (indicated by dashed connecting lines) and/or carrier channels (indicated by solid connecting lines) between the network center node and the network sub-nodes and between the network sub-nodes. Therefore, the dual-medium converged communication network of the invention means that two transmission media, namely a wireless channel and a carrier channel, exist in the Mesh network, the wireless channel not only transmits wireless signals, but also transmits RF beacons, and the carrier channel not only transmits carrier signals, but also transmits HPLC beacons.
The specific implementation manner of step S1 is that the network central node sends out a first networking request, and according to the pre-stored user profile, the wireless networking condition and the carrier networking condition, the network sub-node list and the signal strength (field strength) of the network sub-node are counted, and the network sub-node can also be set. In other words, the communication networking completes the construction of the communication channels between all the nodes in the Mesh network with the dual-media fusion. When communication networking is carried out, the network center node can acquire the signal intensity of each network sub-node, set the communication time slot of each network sub-node and send related signals to the corresponding network sub-nodes in the communication time slots.
In step S2, the network center node constructs a dual-medium parallel sensing superframe, broadcasts and transmits the HPLC beacon and the RF beacon to all network sub-nodes in parallel, and then all network sub-nodes forward the HPLC beacon and the RF beacon in parallel layer by layer.
In step S3, the central node of the network selects a sensing node and a sensing path, and stores the location information of the sensing node. Then, the network center node constructs a dual-medium serial sensing superframe and alternately broadcasts and sends the HPLC beacon and the RF beacon to all network sub-nodes, but only the sensing node can forward the HPLC beacon and the RF beacon.
Step S42, if the network child node that does not join the network receives the sensing information, the network entry request may be initiated according to the time slot arrangement and other contents in the beacon, where the sensing information is an HPLC beacon and an RF beacon. Namely, the HPLC beacon and the RF beacon transmitted in the dual-media serial sensing superframe or the dual-media parallel sensing superframe can initiate a network access request according to the time slot arrangement and other contents in the beacon as long as the network sub-nodes which are not accessed to the network receive the HPLC beacon and the RF beacon.
The sensing method of the invention designs the dual-medium serial sensing superframe and the dual-medium parallel sensing superframe for beacon transmission by utilizing the Mesh network topological structure characteristic of the dual-medium converged communication network. According to the invention, through the mode of alternately broadcasting and transmitting the beacon on the sensing node and the sensing path in the dual-medium serial sensing superframe, the minimum node set capable of covering the nodes of the whole network is selected as the sensing node and the sensing path with wider connection, so that the network sensing efficiency is improved. The invention ensures the full coverage of the network nodes and the access of the nodes which are not accessed to the network by a mode of broadcasting and sending the beacons to all network sub-nodes in parallel through the double-medium parallel sensing superframe. Therefore, through the key technology, the invention realizes the high-efficiency perception of the state of the dual-medium network and also has the advantages of high efficiency, high transmission speed and wider coverage rate.
In step S2, the network center node selects a sensing node and a sensing path in the node layer, including: (see also FIG. 3)
S21: through communication networking, a network center node preliminarily acquires a first parent-child relationship graph of each layer of network child nodes, and selects a sensing node;
s22: in a first parent-child relationship diagram of network child nodes from the Nth layer to the (N + 1) th layer, when a network child node A of the Nth layer is connected with the most network child nodes in the (N + 1) th layer, the network child node A is a first sensing node of the Nth layer, wherein N represents the number of node layers, and N is more than or equal to 1;
s23: the network center node records and stores the first sensing node of the Nth layer and the sensing path of the network sub-node of the N +1 th layer connected with the first sensing node of the Nth layer; in addition, a sensing path of a first sensing node at the Nth layer connected with a network child node at the (N + 1) th layer is removed from the first parent-child relationship graph, and then the network center node obtains a second parent-child relationship graph of the network child nodes from the Nth layer to the (N + 1) th layer;
s24: in a second parent-child relationship diagram of the network child nodes from the nth layer to the (N + 1) th layer, when the network child node B of the nth layer is connected with the most network child nodes in the (N + 1) th layer, the network child node B is a second sensing node of the nth layer;
s25: the network center node records and stores the second sensing node of the Nth layer and the sensing path of the network sub-node of the N +1 th layer connected with the second sensing node of the Nth layer; in addition, a sensing path of a second sensing node at the Nth layer connected with a network child node at the (N + 1) th layer is removed from the second parent-child relationship graph, so that the network center node obtains a third parent-child relationship graph of the network child nodes from the Nth layer to the (N + 1) th layer;
s26: by analogy, after the screening of the network sub-node of the (N + 1) th layer is completed, the network center node completes recording and stores the sensing node of the (N) th layer and the sensing path of the network sub-node of the (N + 1) th layer connected with the sensing node of the (N + 1) th layer;
and the N +1 layer is a node layer which surrounds the outermost layer of the network center node.
In step S23, the sensing path, where the first sensing node at the nth layer is connected to the network child node at the N +1 th layer, includes the first sensing node at the nth layer, the network child node at the N +1 th layer connected to the first sensing node at the nth layer, and a data transmission channel therebetween. When the sensing path of the first sensing node at the Nth layer connected with the network child node at the (N + 1) th layer is removed from the first parent-child relationship graph, the first sensing node at the Nth layer, the network child node at the (N + 1) th layer connected with the first sensing node at the Nth layer and a data transmission channel between the first sensing node and the network child node are removed. Similarly, in step S25, the sensing path, where the second sensing node at the nth layer is connected to the network child node at the N +1 th layer, includes the second sensing node at the nth layer, the network child node at the N +1 th layer connected to the second sensing node at the nth layer, and a data transmission channel therebetween. When a sensing path of a second sensing node at the nth layer connected with a network child node at the (N + 1) th layer is removed from the second parent-child relationship graph, the second sensing node at the nth layer, the network child node at the (N + 1) th layer connected with the second sensing node at the nth layer and a data transmission channel between the second sensing node and the network child node are removed. Then, in step S26, the network child nodes of each layer are filtered according to the method of eliminating until the set of network child nodes of each layer is an empty set.
Step S2: the network center node selects a sensing node and a sensing path in a node layer, and the method further comprises the following steps:
s27: after the network center node finishes recording and storing all sensing nodes of the Nth layer and sensing paths from the Nth layer to the (N + 1) th layer, starting to record and store the sensing nodes of the (N-1) th layer and the sensing paths from the (N-1) th layer to the Nth layer;
s28: by analogy, when the network center node finishes recording and stores the sensing node on the node layer closest to the network center node, the network center node finishes selecting the sensing node and the sensing path.
In the present invention, the sensing paths are screened from the outermost node layer, and the sensing paths are gradually screened to the central node of the network according to the steps from S21 to S27.
In step S3, the hub node constructs a dual-media serial sensing superframe, and broadcasts and transmits the HPLC beacon and the RF beacon alternately, so that the sensing node forwards the HPLC beacon and the RF beacon alternately, where the dual-media serial sensing superframe includes serial superframe wireless and serial superframe carriers.
Referring to fig. 4, the serial superframe wireless includes: a TDMA period and a CSMA period of serial superframe wireless, wherein the TDMA period of serial superframe wireless is connected with the CSMA period of serial superframe wireless;
a TDMA period of the serial superframe wireless for serially transmitted RF beacons;
and the CSMA period of the serial superframe is used for evaluating whether a wireless channel is idle or not so as to enable the wireless channel to carry out data transmission.
The serial superframe carrier includes: a first CSMA period, a second CSMA period, and a TDMA period of a serial superframe carrier; one end of the TDMA time interval of the serial superframe carrier is connected with a first CSMA time interval, and the other end of the TDMA time interval of the serial superframe carrier is connected with a second CSMA time interval;
the first CSMA time period is used for sensing whether a carrier channel is idle or not so as to enable the carrier channel to carry out data transmission;
the TDMA period of the serial superframe carrier is used for serially transmitting the HPLC beacon;
and the second CSMA time period is used for sensing whether the carrier channel is idle or not so as to enable the carrier channel to carry out data transmission.
It should be explained that parameters such as the number of periods, the number of time slots of the periods, the length of each time slot, the network scale and the like of the serial superframe wireless and serial superframe carriers are all set by the network central node, and the RF beacon and the HPLC beacon are sent to the sensing node through the dual-medium serial sensing superframe according to the screened sensing path, so that the RF beacon and the HPLC beacon are broadcasted to the whole network.
In a specific application, the first CSMA time period and the CSMA time period of serial superframe wireless can realize partial coincidence in time relation, and the second CSMA time period and the CSMA time period of serial superframe wireless can realize complete coincidence in time relation; for example, the first CSMA period has 25 slots, of which the last 5 slots can coincide with the slots of the CSMA period of the serial superframe wireless.
In step S3, the method for constructing a dual-media serial sensing superframe by a hub node and alternately broadcasting and transmitting an HPLC beacon and an RF beacon so that the sensing node alternately forwards the HPLC beacon and the RF beacon includes:
firstly, in serial superframe wireless, a network center node and a sensing node send RF beacons, and then in serial superframe carriers, the network center node and the sensing node send HPLC beacons; or the like, or, alternatively,
firstly, the network center node and the sensing node send HPLC beacons in serial superframe carriers, and then the network center node and the sensing node send RF beacons in serial superframe radio.
It should be noted that, when the RF beacon is transmitted in the serial superframe wireless, the hub node and the sensor node only transmit the RF beacon, and the carrier channel performs data transmission. When the HPLC beacon is sent in the serial superframe carrier, the network center node and the sensing node only send the HPLC beacon, and meanwhile, the wireless channel carries out data transmission.
The invention adopts a serial sensing superframe sending mode, namely, both an RF beacon and an HPLC beacon are embedded into the serial sensing superframe, and also adopts a sensing node and sensing path selection algorithm in the step S3 to select a minimum node set capable of covering nodes of the whole network as a sensing node, thereby improving the network sensing efficiency
Referring to fig. 5, the parallel superframe wireless includes: the TDMA time interval of the parallel superframe wireless is connected with the CSMA time interval of the parallel superframe wireless;
the TDMA periods of the parallel superframe radio for parallel transmitted RF beacons;
and the CSMA period of the parallel superframe is used for evaluating whether a wireless channel is idle or not so as to enable the wireless channel to carry out data transmission.
The parallel superframe carriers include: the TDMA time interval of the parallel superframe carrier is connected with the CSMA time interval of the parallel superframe carrier;
the TDMA periods of the parallel superframe carriers are used for the parallel transmission of HPLC beacons;
and the CSMA period of the parallel superframe carrier is used for sensing whether a carrier channel is idle or not so as to enable the carrier channel to carry out data transmission.
The dual-medium parallel sensing superframe comprises a plurality of time frames and a short time frame; the time frame includes parallel superframe wireless and parallel superframe carriers, and the short time frame includes one TDMA period of the parallel superframe wireless and one TDMA period of the parallel superframe carrier.
It should be noted that the dual media parallel sensing superframe is divided into N equal-length time frames and 1 TDMA short-time frame, the N equal-length time frames are composed of TDMA time slots and CSMA time slots, and the TDMA time slots and the CSMA time slots are respectively composed of a certain number of time slots. Since the network size may not be an integer multiple of the number of TDMA slots (i.e. when the network size% is not equal to 0), the number of nodes that are added up is allocated to the last TDMA short-time frame.
And parameters such as the length of each time slot, the network scale, the time slot number of the TDMA (time division multiple access) period, the time slot number of the CSMA (Carrier sense multiple Access) period and the like of the dual-medium parallel sensing superframe are set by the network center node and are broadcast and sent to the network sub-nodes through the parallel superframe, so that the whole network is achieved.
For example, if the number of nodes is 25, with only 1 beacon per time frame (which can be an HPLC beacon or an RF beacon), then 25 time frames are required.
If each time frame has 2 beacons, 25/2 is 12 or more than 1, then 12 time frames +1 short time frames are needed, and the last node performs the forwarding of the beacon in the short time frame.
The dual-medium parallel sensing superframe of the invention can be seen from the time period that the parallel superframe wireless and the parallel superframe carrier are simultaneously transmitted to each network sub-node in the network from the network central node in parallel, however, as understood from the time slot, the RF beacon is configured in the time slot of the TDMA period of the parallel superframe wireless, the HPLC beacon is configured in the time slot of the TDMA period of the parallel superframe carrier, and importantly, the time slot configured by the RF beacon and the time slot configured by the HPLC beacon are different. Therefore, the beacons are planned to be transmitted on the wireless channel and the carrier channel in parallel through the network center node, but one network sub-node is prevented from transmitting the beacons on the wireless channel and the carrier channel at the same time in a certain time slot. The dual media sense the transmission of the superframe in parallel and also ensure the full coverage of the network nodes and the access of the nodes which are not accessed to the network.
Referring to fig. 6, the present invention further includes a sensing period, where the sensing period includes a dual-media parallel sensing superframe and a plurality of dual-media serial sensing superframes.
It should be noted that, in the sensing period, after one dual-medium parallel sensing superframe, a plurality of dual-medium serial sensing superframes are connected to complete beacon transmission in the complete sensing period. The invention adopts the sensing superframe structure composed of the TDMA time slot and the CSMA time slot no matter the dual-medium serial sensing superframe or the dual-medium parallel sensing superframe, and can normally transmit the service data during the beacon transmission period of the dual-medium serial sensing superframe, thereby greatly improving the sensing efficiency and the sensing speed of the dual-medium fusion communication network and ensuring the sensing quality.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A sensing method of a dual-medium converged communication network is applied to a dual-medium converged Mesh network, and the dual-medium converged Mesh network comprises the following steps: the network node comprises a network central node, at least two node layers surrounding the network central node, and wireless channels and/or carrier channels between the network central node and network sub-nodes on the node layers and between the network sub-nodes; the perception method comprises the following steps:
the network center node broadcasts and sends an HPLC beacon and an RF beacon to network sub-nodes on a node layer to complete dual-medium fusion communication networking;
the network central node constructs a dual-medium parallel sensing superframe, and broadcasts and sends an HPLC beacon and an RF beacon in parallel so that all network sub-nodes forward the HPLC beacon and the RF beacon layer by layer in parallel, wherein the dual-medium parallel sensing superframe comprises parallel superframe wireless and parallel superframe carriers;
the network center node is arranged in a node layer and selects a sensing node and a sensing path; the network center node constructs a dual-medium serial sensing superframe, and alternately broadcasts and sends an HPLC beacon and an RF beacon so that the sensing node alternately forwards the HPLC beacon and the RF beacon, wherein the dual-medium serial sensing superframe comprises serial superframe wireless and serial superframe carriers;
if the network sub-node which has joined the network receives the perception information, the network synchronization is completed; wherein, the perception information is an HPLC beacon and an RF beacon;
and if the network child node which does not join the network receives the sensing information, initiating a network access request according to the sensing information.
2. The sensing method according to claim 1, wherein the selecting, by the hub node in the node layer, a sensing node and a sensing path includes:
through communication networking, a network center node preliminarily acquires a first parent-child relationship graph of each layer of network child nodes, and selects a sensing node;
in a first parent-child relationship diagram of network child nodes from the Nth layer to the (N + 1) th layer, when the network child node of the Nth layer is connected with the most network child nodes in the (N + 1) th layer, the network child node of the Nth layer is a first sensing node of the Nth layer, wherein N represents the number of node layers, and N is more than or equal to 1;
the network center node records and stores the first sensing node of the Nth layer and the sensing path of the network sub-node of the N +1 th layer connected with the first sensing node of the Nth layer; in addition, a sensing path of a first sensing node at the Nth layer connected with a network child node at the (N + 1) th layer is removed from the first parent-child relationship graph, and then the network center node obtains a second parent-child relationship graph of the network child nodes from the Nth layer to the (N + 1) th layer;
in a second parent-child relationship diagram of the network child nodes from the nth layer to the (N + 1) th layer, when the network child node of the nth layer is connected with the most network child nodes in the (N + 1) th layer, the network child node is a second sensing node of the nth layer;
the network center node records and stores the second sensing node of the Nth layer and the sensing path of the network sub-node of the N +1 th layer connected with the second sensing node of the Nth layer; in addition, a sensing path of a second sensing node at the Nth layer connected with a network child node at the (N + 1) th layer is removed from the second parent-child relationship graph, so that the network center node obtains a third parent-child relationship graph of the network child nodes from the Nth layer to the (N + 1) th layer;
by analogy, after the screening of the network sub-node of the (N + 1) th layer is completed, the network center node completes recording and stores the sensing node of the (N) th layer and the sensing path of the network sub-node of the (N + 1) th layer connected with the sensing node of the (N + 1) th layer;
and the N +1 layer is a node layer which surrounds the outermost layer of the network center node.
3. The sensing method according to claim 2, wherein the hub node selects a sensing node and a sensing path in a node layer, and further comprising:
after the network center node finishes recording and storing all sensing nodes of the Nth layer and sensing paths from the Nth layer to the (N + 1) th layer, starting to record and store the sensing nodes of the (N-1) th layer and the sensing paths from the (N-1) th layer to the Nth layer;
by analogy, when the network center node finishes recording and stores the sensing node on the node layer closest to the network center node, the network center node finishes selecting the sensing node and the sensing path.
4. The sensing method of claim 1, wherein the serial superframe wirelessly comprises: a TDMA period and a CSMA period of serial superframe wireless, wherein the TDMA period of serial superframe wireless is connected with the CSMA period of serial superframe wireless;
a TDMA period of the serial superframe wireless for serially transmitted RF beacons;
and the CSMA period of the serial superframe is used for evaluating whether a wireless channel is idle or not so as to enable the wireless channel to carry out data transmission.
5. The sensing method of claim 1, wherein the serial superframe carrier comprises: a first CSMA period, a second CSMA period, and a TDMA period of a serial superframe carrier; one end of the TDMA time interval of the serial superframe carrier is connected with the first CSMA time interval, and the other end of the TDMA time interval of the serial superframe carrier is connected with the second CSMA time interval;
the first CSMA time period is used for sensing whether a carrier channel is idle or not so as to enable the carrier channel to carry out data transmission;
the TDMA period of the serial superframe carrier is used for serially transmitting the HPLC beacon;
and the second CSMA time period is used for sensing whether the carrier channel is idle or not so as to enable the carrier channel to carry out data transmission.
6. The method for sensing according to any one of claims 4 to 5, wherein the hub node constructs a dual-medium serial sensing superframe and alternately broadcasts and transmits the HPLC beacon and the RF beacon, so that the sensing node alternately forwards the HPLC beacon and the RF beacon, and the method comprises the following steps:
firstly, in serial superframe wireless, a network center node and a sensing node send RF beacons, and then in serial superframe carriers, the network center node and the sensing node send HPLC beacons; or the like, or, alternatively,
firstly, the network center node and the sensing node send HPLC beacons in serial superframe carriers, and then the network center node and the sensing node send RF beacons in serial superframe radio.
7. The method for sensing as defined in claim 1, wherein the parallel superframe wirelessly comprises: the TDMA time interval of the parallel superframe wireless is connected with the CSMA time interval of the parallel superframe wireless;
the TDMA periods of the parallel superframe radio for parallel transmitted RF beacons;
and the CSMA period of the parallel superframe is used for evaluating whether a wireless channel is idle or not so as to enable the wireless channel to carry out data transmission.
8. The sensing method of claim 7, wherein the parallel superframe carriers comprise: the TDMA time interval of the parallel superframe carrier is connected with the CSMA time interval of the parallel superframe carrier;
the TDMA periods of the parallel superframe carriers are used for the parallel transmission of HPLC beacons;
and the CSMA period of the parallel superframe carrier is used for sensing whether a carrier channel is idle or not so as to enable the carrier channel to carry out data transmission.
9. The sensing method according to claim 8, wherein the dual media parallel sensing superframe comprises several time frames and one short time frame; the time frame includes parallel superframe wireless and parallel superframe carriers, and the short time frame includes one TDMA period of the parallel superframe wireless and one TDMA period of the parallel superframe carrier.
10. The sensing method according to claim 1, further comprising a sensing period, wherein the sensing period comprises one dual-media parallel sensing superframe and a plurality of dual-media serial sensing superframes.
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