CN111970027B - Method for sending beacon signal of broadband carrier communication network - Google Patents
Method for sending beacon signal of broadband carrier communication network Download PDFInfo
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- H—ELECTRICITY
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- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/544—Setting up communications; Call and signalling arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/542—Systems for transmission via power distribution lines the information being in digital form
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/546—Combination of signalling, telemetering, protection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/04—Scheduled or contention-free access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
Abstract
A method for sending beacon signals of a broadband carrier communication network defines 14-16 bits of every 16 bits of a non-central beacon information field in time slot allocation information of the beacon signals as follows: if the last 3 bits of the Y + Z non-central beacon time slots are all 0, the nodes sequentially allocate beacon time slots on a time axis and send beacon signals, otherwise, different nodes can send beacon signals on the same time axis at the same time; in the initial operation stage of the network, the central coordinator sends a beacon signal according to an original beacon sending mechanism, and then sends the beacon signal according to a three-phase line concurrent mechanism: the central coordinator defines reserved bits in the non-central beacon information field based on the aforementioned time slot arrangement and transmits the reserved bits in the central beacon signal; after receiving the beacon signal, the other nodes analyze the time slot arrangement plan of the superframe, which is made by the central coordinator, according to the signaling definition content, and then send and receive signals in respective time slots.
Description
Technical Field
The invention belongs to the technical field of broadband carrier communication, and particularly relates to a method for sending a beacon signal of a broadband carrier communication network.
Background
In order to better meet the information acquisition service requirement of an automatic carrier centralized meter reading system of an intelligent electric meter, two power grid enterprises in China, namely a Chinese power grid company (for short, a national grid) and a southern power grid company in China (for short, a southern grid), issue communication standards aiming at a low-voltage power line broadband high-speed carrier technology in 2017, the file names of the communication standards are respectively 'technical specification for interconnection and intercommunication of low-voltage power line high-speed carrier communication' and 'technical requirement for broadband carrier communication of a low-voltage power user centralized meter reading system', the standards carry out detailed protocol regulation on a service layer, a data link layer and a physical layer, and lay a foundation for large-scale production and application of related communication equipment. The two standards use the MAC protocol of the ieee802.15.4 standard for data link layer protocol design to a certain extent, so the design ideas and frameworks of the two standards are basically the same, and only some slight differences exist in some details.
In a low-voltage distribution network, the transmission line is generally in a three-phase four-wire system, three lines of which represent A, B, C three phases respectively, and one line is a neutral line N. The rotor of the generator consists of three sets of coils at 120 degrees to each other, which produce alternating currents 120 degrees out of phase. The three-phase power supply is to use the three groups of currents as live wires respectively, connect the live wires to different electrical appliances and connect the live wires and the electrical appliances to a common zero wire. In a single-phase power transmission line entering a user, two lines are arranged, one line is a live line, the other line is a zero line, and the zero line is required to pass through current under a normal condition so as to form a loop of the current in the single-phase line. In a three-phase system, when three phases are balanced, the neutral line (zero line) is currentless, so the system is called a three-phase four-wire system. In a 380V low-voltage distribution network, N lines are provided for obtaining 220V interphase voltage from 380V line-to-line voltage, and in some cases, the N lines may be used for zero-sequence current detection so as to monitor three-phase power supply balance.
In a broadband high-speed carrier network which is widely applied at present, in order to save the hardware cost of equipment, all nodes in the network, including a single-phase communication module and a three-phase communication module, are single physical channels, that is, a signal transceiver of the network can only work on one of three phase lines of a/B/C at each time point, and cannot be switched, but a network coordinator (CCO) can automatically change the working phase line at any time through switching (see fig. 1).
Carrier communication link layer protocols established by the national network and the south network are based on a beacon mechanism to carry out network operation and maintenance, and in each beacon period, a central beacon signal initiated by a CCO is subjected to hop-by-hop downlink relay through a network proxy node (PCO) to broadcast the signaling content in the beacon to cover the nodes of the whole network. Under the conditions of large network node scale and large network layer number, the number of network agent nodes will increase, the channel overhead for sending beacon signals will also increase, how to reduce the overhead of beacon signals under the same communication effect condition, and optimizing the beacon signal sending mechanism under the existing standard protocol framework is a focus of attention of various device manufacturers.
Disclosure of Invention
The invention aims to provide an improved sending method of a beacon signal of a broadband carrier communication network, which optimizes a sending mechanism of the beacon signal and reduces the overhead of the beacon signal under the existing standard protocol framework.
In order to achieve the purpose, the invention adopts the following technical solutions:
a method for transmitting a beacon signal of a broadband carrier communication network,
defining a non-central beacon information field in time slot allocation information of a beacon signal as allocation information for indicating Y + Z non-central beacon time slots, wherein the signaling length is 16 x (Y + Z) bits, Y represents the number of nodes which are arranged by a central coordinator in a superframe and are used for sending proxy beacon signals, Z represents the number of nodes which are arranged by the central coordinator in the superframe and are used for sending discovery beacon signals, in each 16 bits of the non-central beacon information field, 1-12 bits represent short addresses of beacon signal sending nodes, 13 bits represent beacon types, and 14-16 bits are defined as: if the last 3 bits of the Y + Z non-central beacon time slots are all 0, the Y + Z nodes sequentially allocate one beacon time slot one by one on a time axis and send beacon signals; if at least one nonzero value exists in the last 3bit values of the Y + Z non-central beacon time slots, different nodes can simultaneously send beacon signals on the same time axis;
the beacon signal sending method comprises the following steps:
step 2, after the initial operation stage of the network is completed, the central coordinator sends a beacon signal according to a three-phase line concurrent mechanism:
the central coordinator divides each node in the agent beacon node set at the beginning of the current superframe into three subsets according to the phase line of the node set, then the nodes in the three subsets are respectively sorted from small to large according to the network hierarchy, and the sending time slots of the agent beacon signals of the agent beacon nodes on different phases are arranged according to the sorting of the nodes in each subset;
the central coordinator divides each node in the discovery beacon node set when the current superframe starts into three subsets according to the phase line of the node, and the discovery beacon nodes on different phase lines simultaneously transmit beacon signals;
step 3, the central coordinator defines reserved bits in the non-central beacon information field based on the time slot arrangement in the step 2 and sends the defined content in the central beacon signal;
and 4, after receiving the beacon signals, other nodes analyze the time slot arrangement plan of the superframe, which is formulated by the central coordinator, according to the signaling definition content, and then respectively transmit and receive signals on the arranged time slots.
Further, when at least one non-zero value exists in the last 3bit values of the Y + Z non-central beacon time slots, the Y + Z nodes allocate the beacon time slots according to the following rules: the last 3bit value corresponding to the 1 st node is set to be 000, for the subsequent nodes, if the last 3bit value of a certain node is the same as that of the previous node, the starting position of the sending time slot of the node is the ending position of the sending time slot of the previous node, otherwise, the starting position of the sending time slot of the node is the same as that of the previous node.
Further, the last 3 bits of the non-central beacon information field of each node have a value of 000 or 001.
Further, in step 2, after the three-phase line concurrence mechanism is executed to transmit the beacon signal, the proxy beacon nodes located on two different phase lines do not transmit the proxy beacon signal at the same time in consecutive superframes.
Further, when a node is off-network, the central coordinator arranges the parent node of the off-network node in the tree topology to independently use a time slot to transmit the proxy beacon signal.
Further, in step 2, the time slot scheduling method for discovering the beacon node is as follows: dividing each node in a discovery beacon node set at the beginning of a current superframe into three subsets according to a phase line of the node, then respectively sequencing the nodes in the three subsets from small to large according to short addresses, dividing the element number of the three subsets by a beacon period counting value modulus of the current superframe to correspondingly obtain three remainder values, then carrying out right cyclic shift on each subset according to the result of sequencing the short addresses from small to large on the basis of the remainder values of each subset, and arranging the sending time slots of sending beacon signals of the discovery beacon nodes on different phase lines by a central coordinator according to the sequencing of the nodes in each shifted subset.
Further, in step 2, when the transmission time slots of the agent beacon nodes are arranged, for the nodes located in the same level in the 1 st superframe, the nodes located in the same level in the 1 st superframe are sorted from small to large according to the short addresses, in the subsequent superframe, for the nodes located in the same level on a certain phase line, if the nodes located in the level are changed compared with the previous superframe, the nodes are sorted from small to large according to the short addresses, and if the nodes located in the level are not changed, the nodes belonging to the first phase line set are sorted, and the sorting result of the nodes located in the same level in the superframe is that one node is circularly shifted from the left of the sorting result of the previous superframe; for the nodes belonging to the second phase line set, the ordering result of the nodes at the same level in the superframe is that the right cycle of the ordering result of the previous superframe shifts by one node, and for the nodes belonging to the third phase line set, the ordering result of the nodes at the same level in the superframe is consistent with the ordering result of the previous superframe.
According to the technical scheme, the method of the invention adopts a three-phase four-wire system to the broadband carrier communication network on the low-voltage distribution network under the existing protocol framework and system, the method improves the sending mode of the beacon signals, utilizes the isolation of three-phase power supply wires to carrier signals under the framework of the existing standard content, improves the serial sending mechanism that the network coordinator of the original protocol only arranges one node on a time slice to send the beacon signals by using one power line into the parallel sending mechanism that three nodes with different phases are allowed to simultaneously send the beacon signals by using 3 different power supply wires respectively on the time slice, therefore, under the condition of obtaining the same beacon signal transmission effect as the original protocol, the cost of occupying the channel by the beacon signal is reduced by 2/3, and the overall communication performance of the network is effectively improved.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive effort.
FIG. 1 is a schematic diagram of the operation of a node in a three-phase carrier network;
FIG. 2 is a schematic diagram of a tree network topology of a broadband high-speed carrier communication network of a power consumption information acquisition system;
FIG. 3 is a schematic diagram of a superframe timeslot structure in "technical Specification for interconnection and interworking of Low Voltage Power line high speed Carrier communication";
fig. 4 is a signal structure diagram of a beacon signal;
FIG. 5 is a diagram illustrating content definition of non-central beacon information;
FIG. 6 is a schematic diagram of a single-channel serial transmission mechanism of a beacon in a conventional protocol;
fig. 7 is a schematic diagram of beacon slots of neighboring nodes distributed on a time axis;
FIG. 8 is a diagram illustrating the distribution of proxy beacon slots according to an embodiment of the present invention;
FIG. 9 is a diagram illustrating values in a non-central beacon information field according to an embodiment of the invention;
fig. 10 is a diagram illustrating a distribution of discovery beacon slots according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned and other objects, features and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 2, the broadband high-speed carrier communication network of the power consumption information collection system generally forms a multi-level association tree network that connects all Slave Stations (STAs) with a Central Coordinator (CCO) as a center and a Proxy Coordinator (PCO) as a relay agent. The central coordinator acts as a central control node for network operation, and uses a superframe time slot structure based on a beacon period to perform network communication, and simultaneously uses a beacon signal to maintain the synchronous and orderly operation of the whole network. In the technical specification of interconnection and interworking of low-voltage power line high-speed carrier communication of the national network, the time slot division of the superframe is shown in fig. 3, and one beacon period includes 4 types of time slots, which are respectively: a beacon slot region, a TDMA slot region, a CSMA slot region, and a bonded CSMA slot region. Similar structures are adopted for time slot division of a superframe in 'technical requirements for broadband carrier communication of a low-voltage power user centralized meter reading system' of the south network, and only 4 time slots are different in sequencing, but because related signaling contents of a TDMA time slot area in two standard protocols only specify the length of the time slot area but do not have corresponding specific node allocation information, the time slot of the type cannot be utilized in practical application, the time slot length is usually 0, and the time slot sequencing of the two protocols is practically the same.
The central coordinator implements synchronized ordered management of the entire network slot structure by using beacon signals, which are of 3 types: the beacon signals of the central beacon, the proxy beacon and the discovery beacon all adopt the signal structure shown in fig. 4 and comprise a preamble signal, a frame control signal and a load signal. At the starting time position of each beacon period, the central coordinator starts to transmit a central beacon signal, and the signal signaling content of the central coordinator carries the time slot parameter information of the beacon period and other network management information. The time slot parameter information mainly comprises the time length of the beacon time slot, the number (X, Y and Z values) of the three types of beacon time slots, network short addresses (TEI) of Y + Z sending nodes corresponding to Y proxy beacon time slots and Z discovery beacon time slots one by one, and related parameters of a CSMA time slot area and a binding CSMA time slot area.
After one node in the network receives a beacon signal sent by another node, if it is found through signaling content analysis that the node is one of the Y + Z sending nodes and the beacon time slot allocated by the node is not yet available on the time axis, the node relays and sends an agent beacon signal or a discovery beacon signal on the time slot belonging to the node after the time of the beacon time slot is reached. Based on this mechanism and the selection of the appropriate proxy relay node, the central coordinator can utilize the X + Y + Z beacon slots to implement downlink network-wide broadcast transmission of its beacon signaling information in one beacon period.
The national network standard and the south network standard define the load field of the beacon signal, and the specific definition is shown in table 1 (in two protocols, the length of the load field of the beacon signal is defined as 136 bytes or 520 bytes), the definition of the beacon management information in the load field is shown in table 2, the definition of the management information type in the beacon management information is shown in table 3, the definition of the time slot allocation message (national network) in the management information type is shown in table 4, and the design idea of the south network standard for the time slot allocation message is basically consistent with that of the national network, which is described by taking the national network standard as an example.
TABLE 1 definition of Beacon Signal payload field
Table 2 field definitions for beacon management messages
Table 3 type definition and content description of management messages
Table 4 content definition of slot assignment message field
As can be seen from table 4, the length of the non-central beacon information is a dynamic value, and the information carried by the non-central beacon information is allocation information for indicating Y + Z non-central beacon time slots, which includes an allocation node short address of a time slot and a beacon type of the time slot, the content of the non-central beacon information is defined as shown in fig. 5, which includes the allocation node short address of the time slot, the beacon type of the time slot, and a reserved bit, the reserved bit does not make any definition of the content, and all values default to zero.
In order to meet the information transmission requirement, in the non-central beacon information, the selection of the agent node set must ensure that the sum of the coverage areas of the beacon relay signals of the agent node set can contain all the accessed nodes of the network; the simultaneous discovery beacon signal can be used for guiding non-networked nodes, and topology discovery and quality detection between networked nodes, so that all Slave Stations (STAs) in the network need to periodically transmit the discovery beacon signal.
As can be seen from the above definition of the information about beacon signal and beacon slot arrangement, the current protocol only arranges one node to transmit a beacon signal on the same time slice of each phase line (fig. 6). Although this mechanism can realize the full-network transmission of the content of the beacon signal, it does not fully utilize three parallel physical communication channels of an a/B/C three-phase four-wire system power supply line where the communication network is located, and there is a large performance improvement space.
Generally speaking, in three-phase four-wire system power supply line, the carrier communication module installed in the smart electric meter will be more evenly distributed on three different live wires, the vast majority of the transmitted energy of carrier signal will be transmitted along the power line direction where it is located, although the power line will result in a certain proportion of carrier signal energy radiating to the air due to the antenna transceiving characteristics generated by the conductor, the insulating layer of the power line has stronger shielding property to electromagnetic signals, so under the condition that there is a certain distance between two different live wires (in order to avoid the voltage to break through the air, the distance of the live wires must be answered to the electrical safety distance during the wiring), the transmission of carrier signal energy across the live wires becomes very weak or difficult. Based on the above, in the protocol framework of the current standard, the invention adds definitions to the reserved bits of the non-central beacon information in the signaling content of the beacon signal, so as to realize the multi-channel concurrency mechanism of the beacon signal in the three-phase four-wire system power supply line, reduce the channel overhead of the beacon signal while continuously maintaining the same signal transmission effect as the original protocol, and improve the operation efficiency of the whole network.
The steps of the method for sending the beacon signal of the broadband carrier communication network are as follows:
the reserved bits in the non-central beacon information field in the time slot allocation information of the beacon signal are defined in an additional way, specifically as follows:
the signaling length of the non-central beacon information field is 16 × (Y + Z) bit (format see fig. 4), which is used to indicate the allocation information of Y + Z non-central beacon slots, where Y represents the number of nodes arranged by the CCO in the superframe to transmit the proxy beacon signal (i.e., the number of proxy beacon slots), and Z represents the number of nodes arranged by the CCO in the superframe to transmit the discovery beacon signal (i.e., the number of discovery beacon slots);
in every 16 bits of the non-central beacon information field, the first 13 bits (1-13 bits) keep the same definition as the original protocol, namely 1-12 bits represent the short address of the beacon signal sending node, the subsequent 1bit (13 th bit) represents the beacon type (agent beacon or discovery beacon), and the last 3 bits (14-16 bits) are defined as: if the last 3 bits of the Y + Z non-central beacon time slots are all 0, continuing to use a beacon sending mechanism which is the same as the original protocol, namely the Y + Z nodes sequentially distribute one beacon time slot one by one on a time axis and send beacon signals; if there is at least one non-zero value in the last 3bit values of the Y + Z non-central beacon slots, this means that the CCO will allow different nodes to transmit beacon signals simultaneously on the same time axis, specifically: the last 3bit value corresponding to the 1 st node is set to 000, for the following nodes, if the last 3bit value of the node is the same as the previous 1 node, the starting position of the sending time slot of the node is the ending position of the sending time slot of the previous node, otherwise, the starting position of the sending time slot of the node is the same as the previous node (fig. 7), and the last 3bit value of the non-central beacon information field of each node can only be set to 000 or 001.
In each superframe, a beacon signal is initiated by a CCO, and relevant network access nodes relay and send the beacon signal at a specified time slot position according to the signaling content indication in the beacon signal, so that the CCO is the only control node of the whole network operation rule. Based on the signaling definition of the non-central beacon information field, the beacon signal is transmitted as follows: the CCO performs the same selection mechanism as the proxy beacon transmitting node and the discovery beacon transmitting node specified by the current protocol;
step 2, after the initial operation stage of the network is completed, the CCO executes a three-phase line concurrency mechanism of the beacon signal based on the collected related information of the current network topology, specifically: dividing each node in the proxy beaconing node set V at the beginning of the current superframe into three subsets V _ A, V _ B, V _ C according to the phase line (a/B/C) of the node, and then sorting the nodes in the three subsets according to the network hierarchy from small to large, as V _ a ═ { a1, a2, a3, … }, V _ B ═ B1, B2, B3, … }, V _ C ═ C1, C2, C3, … }, as shown in fig. 8, the CCO arranges the transmission time slots of proxy beaconing signals of proxy beaconing nodes on different phases according to the sorting of the nodes in each subset (the number of nodes in the three subsets may be different, so the last 3 time slots may not be able to arrange the nodes of 3 different phase lines to transmit at the same time); the nodes in the discovery beacon node set P at the beginning of the current superframe are also divided into three subsets according to the phase line of the nodes, the discovery beacon nodes on different phase lines simultaneously transmit beacon signals, and the discovery beacon nodes do not need to be sequenced from small to large according to the network hierarchy unlike the transmission mechanism of the agent beacon nodes;
step 3, the CCO defines corresponding signaling bit values for reserved bits in the non-central beacon information field according to the definition of the non-central beacon information field given above based on the time slot arrangement, and then the defined content is sent in the central beacon signal; for example, the values in the non-central beacon information field corresponding to the first 9 nodes in fig. 8 are shown in fig. 9;
and 4, after receiving the beacon signal, the other nodes analyze the time slot arrangement plan of the superframe, which is made by the CCO, according to the signaling definition content, and then respectively transmit and receive signals on the arranged time slots.
As a preferred embodiment of the method of the present invention, in order to solve the adverse effect that cross-phase signal transmission interference in a three-phase concurrency mechanism may have on a beacon full-network downlink diffusion effect, after implementing the beacon signal three-phase concurrency mechanism, the CCO adopts the following measures for the arrangement of the proxy beacon time slot:
by adopting a concurrent node combination adjustment measure, on the premise of meeting the hop-by-hop downlink transmission requirement of the proxy beacon signal, the method avoids arranging two nodes with different phases to simultaneously send the proxy beacon signal in a continuous superframe through position adjustment, thereby minimizing the interference probability of the nodes possibly influenced by cross-phase signal transmission interference. Furthermore, if a three-phase line concurrence mechanism is adopted for a period of time, an off-network phenomenon occurs to a node (if a network access node cannot receive beacon signals continuously in a plurality of superframes, the node is off-network), the CCO arranges that a father node of the off-network node in the tree topology independently uses a time slot to send the proxy beacon signal (namely, the time slot of the node is not arranged for nodes of other two phase lines to send signals simultaneously, so that the influence of cross-phase signal transmission interference is eliminated), and the off-network node is guided to rapidly re-access the network.
In a superframe, after the proxy beacon time slot is finished, theoretically, the discovery beacon nodes of the superframe all receive beacon signals, and the purpose of sending the discovery beacon signals is to guide non-network-accessing nodes which cannot receive the proxy beacon signals to access the network, so that the time sequence problem of hop-by-hop transmission does not need to be considered in time slot arrangement. As another preferred embodiment of the method of the present invention, in order to minimize the probability that two nodes with different phases simultaneously transmit discovery beacon signals, the specific scheduling mechanism on the discovery beacon slot is:
dividing nodes in a discovery beacon node set P of the superframe into three subsets P _ A, P _ B and P _ C according to a phase line (A/B/C) of the discovery beacon node set P, sorting the nodes in the three subsets according to short addresses from small to large respectively, dividing the element number of the 3 subsets by a beacon period count value of the superframe (the beacon period count value is used for indicating a superframe sequence of the network, the value is increased by one when one superframe is finished, the national network and the southern network can be referred to by specific definition), respectively marking remainders of the subsets P _ A, P _ B and P _ C as G1, G2 and G3, then carrying out right-cycle shift on the sorted result of each subset according to the short addresses from small to large for a plurality of positions based on the respective remainder values, and respectively setting the shifted subsets as P _ A _ M { aa1, aa2, aa } 3, … and P _ B _ M { 1 }, bb2, bb3, …, and P _ C _ M { cc1, cc2, cc3, … }, as shown in fig. 10, the CCO arranges the beacon signal transmission slots of the discovery beacon nodes on different lines in the order of the nodes in each shifted subset.
In step 2, the agent beacon nodes of the three phase lines are ordered from small to large according to the network hierarchy, but in practical application, there may be a plurality of nodes in the same hierarchy, and the ordering mechanism for the nodes in the same hierarchy is specifically: after a three-phase concurrent mechanism of beacon signals is started, nodes in the same level in a1 st superframe are sequenced from small to large according to the size of short addresses, and in a subsequent superframe, for a node subset in a certain level on a certain phase line, if compared with the previous superframe, if the elements of the node subset in the same level change (nodes leave or new nodes enter), the nodes are sequenced from small to large according to the size of the short addresses; if the elements of the node sets in the same level are not changed, for an A phase line set (a first phase line set), the ordering result of the node sets in the same level in the superframe is a node which is circularly shifted from the left of the ordering result of the previous superframe; for the phase line set (second phase line set), the ordering result of the same-level node set in the superframe is a node shifted from the right cycle of the ordering result of the previous superframe; for the C-phase line set (the third phase line set), the ordering result of the peer-level node set in the super frame is consistent with that of the previous super frame. The mechanism can ensure that the probability that two nodes with different phases send proxy beacon signals simultaneously is minimized on the premise that the CCO meets the requirement of downlink hop-by-hop transmission of the beacon signals, so that the influence of cross-phase signal transmission interference on the overall receiving effect of the network beacon signals is minimized.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A method for transmitting a beacon signal in a wideband carrier communication network, comprising:
defining a non-central beacon information field in time slot allocation information of a beacon signal as allocation information for indicating Y + Z non-central beacon time slots, wherein the signaling length is 16 x (Y + Z) bits, Y represents the number of nodes which are arranged by a central coordinator in a superframe and are used for sending proxy beacon signals, Z represents the number of nodes which are arranged by the central coordinator in the superframe and are used for sending discovery beacon signals, in each 16 bits of the non-central beacon information field, 1-12 bits represent short addresses of beacon signal sending nodes, 13 bits represent beacon types, and 14-16 bits are defined as: if the last 3 bits of the Y + Z non-central beacon time slots are all 0, the Y + Z nodes sequentially allocate one beacon time slot one by one on a time axis and send beacon signals; if at least one nonzero value exists in the last 3bit values of the Y + Z non-central beacon time slots, different nodes can simultaneously send beacon signals on the same time axis;
the beacon signal sending method comprises the following steps:
step 1, in the initial operation stage of a network, a central coordinator sets the numerical value of the last 3 bits of all Y + Z non-central beacon time slots in a non-central beacon information field to be 0, and sends a beacon signal according to an original beacon sending mechanism;
step 2, after the initial operation stage of the network is completed, the central coordinator sends a beacon signal according to a three-phase line concurrent mechanism:
the central coordinator divides each node in the agent beacon node set at the beginning of the current superframe into three subsets according to the phase line of the node set, then the nodes in the three subsets are respectively sorted from small to large according to the network hierarchy, and the sending time slots of the agent beacon signals of the agent beacon nodes on different phases are arranged according to the sorting of the nodes in each subset;
the central coordinator divides each node in the discovery beacon node set when the current superframe starts into three subsets according to the phase line of the node, and the discovery beacon nodes on different phase lines simultaneously transmit beacon signals;
step 3, the central coordinator defines reserved bits in the non-central beacon information field based on the time slot arrangement in the step 2 and sends the defined content in the central beacon signal;
and 4, after receiving the beacon signals, other nodes analyze the time slot arrangement plan of the superframe, which is formulated by the central coordinator, according to the signaling definition content, and then respectively transmit and receive signals on the arranged time slots.
2. The transmission method of a beacon signal of a broadband carrier communication network as claimed in claim 1, wherein: when at least one nonzero value exists in the last 3bit values of the Y + Z non-central beacon time slots, the Y + Z nodes allocate the beacon time slots according to the following rules: the last 3bit value corresponding to the 1 st node is set to be 000, for the subsequent nodes, if the last 3bit value of a certain node is the same as that of the previous node, the starting position of the sending time slot of the node is the ending position of the sending time slot of the previous node, otherwise, the starting position of the sending time slot of the node is the same as that of the previous node.
3. The transmission method of a beacon signal of a broadband carrier communication network as claimed in claim 1, wherein: the last 3 bits of the non-central beacon information field of each node have a value of 000 or 001.
4. A method for transmitting a beacon signal of a broadband carrier communication network according to claim 1, wherein: in step 2, after the three-phase line concurrency mechanism is executed to send the beacon signals, the agent beacon nodes on two different phase lines do not send the agent beacon signals at the same time in the continuous superframe.
5. A method for transmitting a beacon signal of a broadband carrier communication network according to claim 1, wherein: when a node has the off-network phenomenon, the central coordinator arranges the node having the off-network phenomenon to independently use a time slot for transmitting the proxy beacon signal at a parent node in the tree topology.
6. A method for transmitting a beacon signal of a broadband carrier communication network according to claim 1, wherein: in step 2, the time slot arrangement method for discovering the beacon node is as follows: dividing each node in a discovery beacon node set at the beginning of a current superframe into three subsets according to a phase line of the node, then respectively sequencing the nodes in the three subsets from small to large according to short addresses, dividing the element number of the three subsets by a beacon period counting value modulus of the current superframe to correspondingly obtain three remainder values, then carrying out right cyclic shift on each subset according to the result of sequencing the short addresses from small to large on the basis of the remainder values of each subset, and arranging the sending time slots of sending beacon signals of the discovery beacon nodes on different phase lines by a central coordinator according to the sequencing of the nodes in each shifted subset.
7. A method for transmitting a beacon signal of a broadband carrier communication network according to claim 1, wherein: in step 2, when the sending time slots of the agent beacon nodes are arranged, for the nodes located at the same level in the 1 st superframe, the nodes located at the same level in the 1 st superframe are sorted from small to large according to the short addresses, in the subsequent superframe, for the nodes located at the same level on a certain phase line, if the nodes located at the level are changed compared with the nodes located at the last superframe, the nodes are sorted from small to large according to the short addresses, and if the nodes located at the level are not changed, the nodes belonging to the first phase line set are sorted, and the sorting result of the nodes located at the same level in the superframe is that one node is circularly shifted from the left of the sorting result of the last superframe; for the nodes belonging to the second phase line set, the ordering result of the nodes at the same level in the superframe is that the right cycle of the ordering result of the previous superframe shifts by one node, and for the nodes belonging to the third phase line set, the ordering result of the nodes at the same level in the superframe is consistent with the ordering result of the previous superframe.
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| CN113644936B (en) * | 2021-07-06 | 2023-04-25 | 珠海中慧微电子有限公司 | Three-phase parallel communication method of broadband carrier communication network |
| CN113747582B (en) * | 2021-08-18 | 2024-04-05 | 珠海中慧微电子有限公司 | Configuration method, device, storage medium and node of beacon time slot area |
| CN114629529B (en) * | 2022-04-19 | 2023-06-02 | 珠海中慧微电子有限公司 | Channel access method for broadband carrier communication network |
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