CN111970030A - Signal transmitting method of broadband carrier communication network - Google Patents
Signal transmitting method of broadband carrier communication network Download PDFInfo
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Abstract
A signal transmission method of a broadband carrier communication network, adding new definitions to a TDMA time slot link identifier, a TDMA time slot area length and a reserved bit of a time slot allocation message field in time slot allocation information of a beacon signal, allocating addresses in a short address pool from small to large to nodes applying for network access by a CCO according to the sequence of network access time of the nodes, and setting a routing period and the number of times that each network access node needs to transmit a discovery list message every T seconds; the CCO sorts the network access nodes in the network access node set from small to large based on the size of the short address to obtain a sending queue, arranges the first M nodes in the sending queue to send a discovery list message in a TDMA time slot area in the superframe, and then deletes the M nodes from the sending queue; and repeating the steps until the number of the nodes in the sending queue is zero. The invention improves the channel access mode of certain service type signals under the existing standard protocol framework, and improves the comprehensive communication performance of the network.
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
The intelligent-meter-based automatic electricity consumption information acquisition system is an important component of the ubiquitous power internet, and the carrier communication technology becomes the most widely used information transmission means in the system by virtue of the natural connection that signal transmission is carried out by using a power line as a channel. 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 are participated and formulated by the same equipment manufacturer in China, so the design ideas and the frames of the two standards are basically the same, and only small differences exist on small details so as to be convenient for distinguishing.
With the official issuance of relevant standards in 2017, the development of broadband high-speed carrier communication technology in China enters a motorway, and by the end of 2019, annual purchase and sale amounts of relevant equipment by power grid enterprises in all parts of the country reach the hundred million yuan scale. Compared with the traditional narrow-band carrier communication, the physical layer speed of the new generation carrier communication module is increased to the Mbps level from dozens of kbps, the overall communication capacity of the automatic meter reading system is obviously improved, and key performance indexes such as networking time, meter reading time and the like are obviously improved. However, as a first generation communication protocol, a scheme on a link layer adopts a relatively general design concept, and is not specially designed for the transmission characteristics of network services, and the channel access mode of various services is too single to flexibly adapt to the transmission characteristics of different services of a network, for example, in the aspect of channel access, in the network operation process, except for the beacon signal using a TDMA contention-free access mode, other types of services, including various types of service layer data messages, MAC layer management message messages and the like, can only use a contention mode to perform channel access in a CSMA time slot area, and when the scale of a network node is large or the network service layer data services are busy, the signal transmission process conflicts are relatively serious, which may result in lower operation efficiency of the whole network and failure in the network comprehensive communication performance.
Related products developed and produced according to the existing communication protocols of national and south networks are sold and deployed in a large amount in power grid companies of various provinces nationwide, and the large modification of the communication protocols means that a large amount of laboratory and field networking tests need to be carried out on communication equipment again, so that large technical risks and market risks exist. Therefore, how to improve the comprehensive communication performance of the network under the existing standard protocol framework is a very challenging technical problem.
Disclosure of Invention
The invention aims to provide an improved sending method of broadband carrier communication network signals, which improves the channel access mode of certain service type signals under the existing standard protocol framework to improve the comprehensive communication performance of the network.
In order to achieve the purpose, the invention adopts the following technical solutions:
a signal transmission method of a broadband carrier communication network defines a TDMA time slot link identifier, a TDMA time slot area length and a reserved bit of a time slot distribution message field in time slot distribution information of a beacon signal as follows;
the TDMA time slot link identifier is used for indicating the service type supported by the TDMA time slot, and the service type comprises an upgrading service message, a heartbeat detection message and a discovery list message;
when the value of the TDMA time slot length is 0, the TDMA time slot zone length is 0; if the numerical value of the TDMA time slot length is not 0 and the TDMA time slot link identifier is an upgrade service message, the TDMA time slot area contains X + Y time slots, X is the number of the central beacon time slots, and Y is the number of the agent beacon time slots; if the value of the TDMA time slot length is not 0 and the TDMA time slot link identifier is a heartbeat detection message, the TDMA time slot area comprises Y time slots; if the numerical value of the TDMA time slot length is not 0 and the TDMA time slot link identifier is a discovery list message, the TDMA time slot area comprises P time slots;
when the value of the reserved bit is zero, it is meaningless, when the value is not zero, it represents the short address of node 1 and the short address of node 2, node 1 is the 1 st node of the first M sending nodes arranged in the superframe, node 2 represents the last 1 node of the first M sending nodes arranged in the superframe, M ═ T ÷ T × K × N, T is the time length of the superframe, T is the routing period, K is the number of times each network access node needs to send the discovery list message every T seconds, and N is the number of network access nodes;
the steps of the CCO signaling are as follows:
s1, allocating short addresses; when the CCO allocates the short address to the node applying for network access, the addresses in the short address pool are allocated to the node applying for network access from small to large according to the sequence of the network access time of the node;
s2, setting a routing period; the CCO sets a routing period to be T seconds, and stipulates that each network access node needs to send a discovery list message for K times every T seconds;
s3, sending signals; the CCO sorts the network access nodes in the network access node set from small to large based on the size of the short address to obtain a sending queue, arranges the first M nodes in the sending queue to send a discovery list message in a TDMA time slot area in the superframe, and then deletes the M nodes from the sending queue;
steps S1 to S3 are repeated until the number of nodes in the transmission queue is zero.
Further, the time slots in the TDMA time slot area are allocated as follows:
when the numerical value of the TDMA time slot length is not 0 and the TDMA time slot link identifier is an upgrade file, X + Y time slots in a TDMA time slot area are allocated to CCO, and the rest Y time slots are sequentially allocated to Y agent beacon signal transmitting nodes;
when the numerical value of the TDMA time slot length is not 0 and the TDMA time slot link identifier is a heartbeat detection message, sequentially allocating Y time slots in the TDMA time slot area to Y agent beacon signal sending nodes in a reverse order;
when the value of the TDMA time slot length is not 0 and the TDMA time slot link identifier is a discovery list message, P time slots in the TDMA time slot area are sequentially allocated to P proxy beacon signal transmitting nodes in an order from small to large according to short addresses, where P is (E2-E1+1), E1 is the short address of the node 1, and E2 is the short address of the node 2.
Further, in step S1, if there is a node offline in the network operation process, the CCO recovers the address of the offline node and allocates the node to a new node applying for network entry.
Further, if M is a non-integer, rounding up.
Further, when the number of nodes in the transmission queue is zero, the transmission queue is generated again based on the network access node set, and then the transmission is scheduled again by adopting the same scheduling mechanism.
Furthermore, for reserved bit 1 and reserved bit 2 in the time slot allocation message field adopting the national network standard, when the value of the reserved bit 1 is all zero, the value is meaningless, and when the value is not all zero, the value represents part of the short address of the node 1; when the value of the reserved bit 2 is zero, the value is meaningless, the first 2 bits of the non-zero bit represent the residual part of the short address of the node 1, the 3 rd to 14 th bits represent the short address of the node 2, and the last 2 bits are all zero;
for the reserved bits in the time slot allocation information field adopting the south network standard, when the value of the reserved bits is all zero, the first 12 bits of the reserved bits represent the short address of the node 1, the 13 th to 24 th bits represent the short address of the node 2, and the last 8 bits are all zero.
According to the technical scheme, the method improves the channel access modes of a TDMA (time division multiple access) time slot link identifier, a TDMA time slot region length and reserved bits of a time slot allocation message field in the time slot allocation information of a beacon signal, a management message of an MAC (media access control) layer which needs to be frequently and periodically transmitted and has the highest service load level, namely a discovery list message and a heartbeat detection message under the existing protocol frame and system. Because the method of the invention is compatible with the existing protocol, the market and technical risks are low; and the success rate of sending these messages is improved based on a new signal sending mechanism, the accuracy of maintaining the network routing topology information is improved, and the service load level of the CSMA time slot area is effectively reduced, thereby improving the comprehensive transmission performance of the service layer data service.
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 a tree network topology of a broadband high-speed carrier communication network of a power consumption information acquisition system;
FIG. 2 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. 3 is a diagram illustrating the definition of reserved bits in the national network standard according to the method of the present invention;
fig. 4 is a diagram illustrating the definition of reserved bits in the south china standard according to the method 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. 1, a broadband high-speed carrier communication network of a 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. 2, 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 the time slot division of the superframe in the technical requirement of broadband carrier communication of the low-voltage power user centralized meter reading system of the south network, and only 4 time slots are sequenced differently and sequentially comprise a beacon time slot area, a CSMA time slot area, a TDMA time slot area and a binding CSMA time slot area.
The central coordinator implements synchronized ordered management of the entire network slot structure by using beacon signals, which are of 3 types: central beacons, proxy beacons, and discovery beacons. 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 includes 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, and related parameters of a TDAM time slot area, a CSMA time slot area and a CSMA binding 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 the mechanism and the selection of the appropriate proxy relay node, the central coordinator can utilize the X + Y beacon time slots to realize the downlink network-wide broadcast transmission of the beacon signaling information of the central coordinator in a beacon period, and the coverage range comprises the network-connected nodes in the whole network.
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 load part of the beacon signal is defined as an encoding module which can only adopt 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 in the management information type by the national network is shown in table 4, and the definition of the time slot allocation message in the management information type by the south network is shown in table 5.
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 definition of the contents of the slot assignment message field (national network)
Table 5 content definition of timeslot assignment message field (south network)
As can be seen from table 3, the length of the content of the timeslot assignment message is a dynamic value, and the length is also the signaling content with the largest content length in the payload field. As can be seen from comparing table 4 and table 5, the national network and the south network are designed in the same way on the timeslot assignment message, but there are some differences in the details of the order and the length of some signaling fields. The value of the reserved bit defaults to 0.
According to the definition of the 'TDMA time slot link identifier' field by the existing protocol, the CCO sets the TDMA time slot length to a non-zero value only when the network performs software upgrade, thereby arranging for the CCO and the proxy node to use the TDMA time slot to transmit upgrade packetized data. During the operation of the network, the TDMA time slot length is 0, so except the beacon signal, all other types of signals in the network can only perform random contention transmission on the CSMA time slot area.
The service transmitted in the CSMA timeslot area has different types of MAC layer management messages in addition to the service packet initiated by the service layer, and the related description is shown in table 6. The messages in table 6 are defined for both the national and the south networks as not otherwise specified.
Table 6MAC management message description
The size of the routing period is generally decided by a CCO (central control unit) according to needs, the value range is 20-420 seconds, the nodes in the whole network are informed by beacon signals, and the parameter is the time window size used for defining the nodes to carry out routing evaluation. The proxy node in the heartbeat detection message uses a bitmap mode to indicate the activity of the node (the activity means whether the node has a signal sending behavior in the past period of time, and the CCO can judge whether the network access node is off-network or failed according to the activity), and the basic principle of the bitmap mode is as follows: if the maximum value of the short address of the child node in the child node set of a certain proxy node is J, the proxy node uses J bits in a heartbeat detection message sent by the proxy node to identify the activity of the node, that is, if the proxy node receives a signal of a node with a short address J (J is less than or equal to J) in the past period of time, the value of the jth bit is 1, otherwise, the jth bit is 0. Because each proxy node needs to periodically send a heartbeat detection message to the CCO, the proxy node can combine the content of the message of the proxy node and the content of the message of the subordinate proxy node received by the proxy node in the uplink multi-hop transmission process of the message, thereby reducing the signal sending times and reducing the channel overhead.
As can be seen from the content in table 6, in many different types of management messages in the MAC layer, except that 3 types of messages, i.e., heartbeat detection, discovery list, and communication success rate, need to be periodically transmitted, the transmission of other types of messages is temporarily triggered as needed, and the transmission probability is very low, so the traffic load level can be ignored, and it is not necessary to consider improving the channel access mode; the communication success rate message is sent by the proxy nodes, each proxy node needs to send the message to the CCO for 1 time in every 4 routing periods, the service load level is also low, and the channel access mode of the proxy node does not need to be improved.
Each agent node sends 1 heartbeat detection message to the CCO every 1/8 routing cycles, and the best transmission mode of the heartbeat detection message is as follows: in 1/8 routing cycle time, the agent node farthest from the CCO sends heartbeat detection messages first, and then in the process of message hop-by-hop uplink multi-hop transmission, the agent nodes on the path continuously merge the contents, so that the sent heartbeat detection messages carry the heartbeat detection message information of the subordinate agent nodes and the message contents to be reported, and each agent node only needs to send 1 heartbeat detection message in 1/8 routing cycles. If the sending sequence cannot be realized, for example, the near-end proxy node sends its heartbeat detection message first, and then needs to relay the message of the far-end proxy node, the number of signal sending times is greater than 1. Thus, the load level of the heartbeat detection message is high, and the original CSMA contention channel access mode needs to be improved.
The discovery list message is the most important message among MAC layer management messages, and in a broadband carrier communication network, each network-accessing station, including a CCO, has a neighbor station, a neighbor station or a CCO, or a proxy station, or other STA stations. A neighbor station of a certain station is a station with which the station can perform carrier communication.
In the networking process, each station can sense own neighbor stations according to the received discovery beacons and record the neighbor stations to form a discovery list. The relay route of a station may be selected in its own discovery list. If each station broadcasts and publishes the discovery list of the station, the more comprehensive network topology information can be formed, and the stations can find more proper routes. The discovery list message is mainly used for route evaluation, and the sending period of the discovery list message is determined according to the route period. Both national network and south network are specified, and the routing period can be gradually increased within 20-420 seconds according to the increase of the network scale. And in a routing cycle, the network access node sends the discovery list at least 10 times.
After networking is completed, the discovery list messages are required to be sent regularly, including the CCO and all the STA stations accessing the network, and the discovery list messages carry information such as a discovery list of the station. The stations receive the discovery list message to obtain more comprehensive neighbor station information and form a more detailed discovery list so as to select a better station as a self proxy station or a backup routing station. In the routing mechanism, the nodes also carry out link quality evaluation according to the receiving success rate of the message.
At present, the protocols in the two standards both stipulate that the discovery list message can only be sent by using the CSMA timeslot zone through a contention mechanism, which brings about the following problems:
1. the number of nodes for sending the message is large, the sending frequency is high, the service load level is high, interference is easily generated on the transmission process of the data message of the service layer, and the communication success rate and the transmission delay performance of the data message are reduced;
2. compared with a single receiving node of point-to-point transmission, the local broadcast sending mode of the signal means that a large number of receiving nodes exist, and the probability of the signal being interfered is further obviously increased under the multi-hop topology;
3. because the interference probability is high, the accuracy of a mechanism for performing link quality evaluation based on the packet reception success rate is poor, for example, in an area where the number of nodes is large and the distribution is dense, when the nodes periodically compete to send discovery list signals, the reception success rate is reduced due to high collision probability, so that a path with good link quality is evaluated as a path with poor quality, thereby affecting the efficiency of a routing layer.
Since the load level of the discovery list message is very large, there is a need for improvement of the original CSMA contention channel access method.
Based on this, the invention adds new definition to the reserved bit of the time slot distribution message field in the signaling content of the beacon signal and increases the service support type of the TDMA time slot area under the protocol frame of the current standard, and changes the sending mode of the heartbeat detection message and the discovery list message from the original CSMA competition access mode to the TDMA non-competition access mode.
The signal transmitting method of the broadband carrier communication network comprises the following steps:
the TDMA time slot length, TDMA time slot link identifier and reserved bit increase definition of the time slot allocation message field in the time slot allocation information of the beacon signal are as follows:
when the value of the TDMA time slot length is 0, the TDMA time slot zone length is 0; if the numerical value is not 0 and the TDMA time slot link identifier is an upgrade file, the TDMA time slot area contains X + Y time slots (X is the number of the central beacon time slots), the first X time slots are allocated to the CCO, and the rest Y time slots are sequentially allocated to the Y agent beacon signal transmitting nodes; if the numerical value is not 0 and the TDMA time slot link identifier is a heartbeat detection message, the TDMA time slot area contains Y time slots, and the Y time slots are sequentially distributed to Y agent beacon signal sending nodes in a reverse order; if the numerical value is not 0 and the TDMA time slot link identifier is a discovery list message, the TDMA time slot area comprises P time slots, the P time slots are sequentially distributed to P proxy beacon signal transmitting nodes which are sequenced from small to large according to short addresses, and P is (E2-E1+ 1);
the TDMA time slot link identifier is used for indicating the service type supported by the TDMA time slot, and the service type comprises an upgrading service, a heartbeat detection message and a discovery list message;
for reserved bit 1 in a time slot allocation message field adopting the national network standard, when the value of the reserved bit 1 is all zero, the value is meaningless, and when the value is not all zero, the reserved bit 1 represents a part of short addresses of the node 1; for the reserved bit 2, when the value of the reserved bit 2 is all zero, the value is meaningless, when the value is not all zero, the first 2 bits of the reserved bit 2 represent the residual part of the short address of the node 1, the 3 rd to 14 th bits represent the short address of the node 2, and the last 2 bits are all zero and meaningless (fig. 3); the node 1 is the 1 st node of the first M sending nodes (agent beacon signal sending nodes) in the sending queue Q arranged in the superframe, the node 2 represents the last 1 node of the first M sending nodes (agent beacon signal sending nodes) in the sending queue Q arranged in the superframe, and the sending queue Q is a node set obtained by sequencing the network access nodes in the network access node set S from small to large based on the size of short addresses;
for the reserved bits in the time slot allocation information field adopting the south network standard, when the value of the reserved bits is all zero, the reserved bits are meaningless, the first 12 bits of the reserved bits represent the short address of the node 1, the 13 th to 24 th bits represent the short address of the node 2, and the last 8 bits are all zero and meaningless (fig. 4). See in particular tables 7 and 8.
Table 7 content definition of timeslot assignment message field (national network)
Table 8 content definition of timeslot assignment message field (south network)
The invention does not modify the existing definition of the existing protocol, the table only lists the description of the newly added definition field, the field positions and the definitions of the rest parts have no change, and the invention does not provide the space saving. After each node accesses the network, the CCO allocates a network-wide unique short address (TEI) to the node to identify the identity, and the length of the node is 12 bits.
That is, when the value of the TDMA time slot length is nonzero and the TDMA time slot link identifier is an upgrade file, a heartbeat detection message, and a discovery list message, respectively, the time slot allocation method in the TDMA time slot area is as follows:
the number of the agent nodes is Y, and is A _1, A _2, …, A _ Y-1 and A _ Y:
if the service type supported by the TDMA time slot is an upgrade file, Y TDAM time slots are sequentially allocated to each agent node (agent beacon signal transmitting node) in the TDMA time slot area for use, namely the node allocation sequence is A _1, A _2, …, A _ Y-1 and A _ Y;
if the service type supported by the TDMA time slot is the heartbeat detection message, Y TDAM time slots are distributed to each agent node (agent beacon signal transmitting node) in a TDMA time slot area in a reverse order for use, namely the node distribution order is A _ Y, A _ Y-1, …, A _2 and A _ 1;
if the service type supported by the TDMA time slot is a discovery list message, a total of E2-E1+ 1 proxy nodes (proxy beacon signal transmitting nodes) with short addresses of E1, E1+1, E1+2, …, E2-1 and E2 are sequentially allocated to (E2-E1+1) in the TDMA time slot area for use, wherein E1 is the short address of the node 1, and E2 is the short address of the node 2.
The time slot distribution rule corresponding to the heartbeat detection message can ensure that the agent node with the largest hop number away from the CCO firstly sends the heartbeat detection message in sequence, and then the agent node with the last hop begins to send the heartbeat detection message … … until the agent node with only 1 hop away from the CCO. The method is an optimal heartbeat detection message sending method, and the sending times of the heartbeat detection message of each agent node in each 1/8 routing cycle time are reduced to be minimum 1 time on the premise of meeting the protocol regulation.
Based on the definition of the reserved bit of the time slot allocation message field and the sending mode of the message signal, the CCO sends the signal by adopting the following method:
s1, allocating short addresses; when the CCO allocates the short address to the node applying for network access, the addresses in the short address pool are allocated to the node applying for network access from small to large according to the sequence of the network access time of the node; further, if nodes leave the network in the network operation process, the CCO recovers the addresses of the nodes leaving the network and allocates the addresses to new nodes applying for network access, so that idle addresses which are not allocated between the minimum short address and the maximum short address of the nodes accessing the network are avoided as much as possible;
s2, setting a routing period; the CCO sets a routing period to be T seconds, and stipulates that each network access node needs to send discovery list messages for K times (K is more than or equal to 10) every T seconds, namely each network access node needs to send discovery list messages for 1 time on average every T/K seconds; the national network protocol and the south network protocol only specify that the value range is 20-420 seconds, but do not make a strong regulation on the value of T, and can be set by a CCO manufacturer independently, and the national network protocol and the south network protocol only specify that nodes are sent at least 10 times in each routing period, but do not make a strong regulation on a specific value, and can also be set by the CCO manufacturer independently;
s3, sending signals; the CCO sorts the network access nodes in the network access node set S from small to large based on the short addresses to obtain a sorted sending queue Q, and arranges nodes with corresponding proportional quantity in the network access node set S according to the superframe time and the T/K value to send discovery beacon signals, namely, arranging the first M nodes in the Q queue in the superframe to send discovery list messages in a TDMA time slot area, and then deleting the M nodes from the sending queue Q; if M is a non-integer, rounding up, wherein T is the time length of the superframe and N is the number of the network access nodes;
repeating the steps S1 to S3 until the number of nodes in the transmission queue Q is zero, when the number of nodes in the transmission queue Q is zero, generating the transmission queue Q again based on the network access node set S, and then scheduling transmission again by adopting the same scheduling mechanism.
More specifically, if a new node joins the set S in 1 sending cycle, the node is not scheduled to send the discovery list message in the remaining time of the sending cycle, but is scheduled to start after the next sending cycle comes.
As can be seen from the above selection mechanism of the node sending the discovery list message, the short addresses of the neighboring nodes arranged by the CCO are consecutive and incremental, so that the node 1 short address is used to indicate the short address value of the 1 st node of the first M sending nodes in the sending queue Q arranged in the superframe, and the node 2 short address indicates the short address value of the last 1 node of the first M sending nodes in the sending queue Q arranged in the superframe, which can carry information in this way, including: the TDMA time slot number in the superframe and the allocation node short addresses corresponding to the time slots one by one fully meet the allocation requirement of the TDMA time slots, thereby realizing a very efficient information carrying mode.
The method of the invention adds definition to the meaningless reserved bits in the original protocol, and adds some rules, under the condition of being compatible with the original protocol, the network can change the mode of two MAC layer management message messages with the highest service load level from the original single CSMA competition access mode to the mode of flexibly supporting CSMA competition and TDMA non-competition simultaneously. If the CCO selects to adopt a TDAM contention-free mode, the accuracy of the link quality evaluation between the node and the neighbor node is obviously improved, and meanwhile, the service load level of the CSMA time slot area is obviously reduced, thereby laying a foundation for improving the transmission performance of other types of messages.
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 (6)
1. A method for signaling in a wideband carrier communication network, comprising:
defining a TDMA time slot link identifier, a TDMA time slot region length and reserved bits of a time slot allocation message field in the time slot allocation information of the beacon signal as follows;
the TDMA time slot link identifier is used for indicating the service type supported by the TDMA time slot, and the service type comprises an upgrading service message, a heartbeat detection message and a discovery list message;
when the value of the TDMA time slot length is 0, the TDMA time slot zone length is 0; if the numerical value of the TDMA time slot length is not 0 and the TDMA time slot link identifier is an upgrade service message, the TDMA time slot area contains X + Y time slots, X is the number of the central beacon time slots, and Y is the number of the agent beacon time slots; if the value of the TDMA time slot length is not 0 and the TDMA time slot link identifier is a heartbeat detection message, the TDMA time slot area comprises Y time slots; if the numerical value of the TDMA time slot length is not 0 and the TDMA time slot link identifier is a discovery list message, the TDMA time slot area comprises P time slots;
when the value of the reserved bit is zero, it is meaningless, when the value is not zero, it represents the short address of node 1 and the short address of node 2, node 1 is the 1 st node of the first M sending nodes arranged in the superframe, node 2 represents the last 1 node of the first M sending nodes arranged in the superframe, M ═ T ÷ T × K × N, T is the time length of the superframe, T is the routing period, K is the number of times each network access node needs to send the discovery list message every T seconds, and N is the number of network access nodes;
the steps of the CCO signaling are as follows:
s1, allocating short addresses; when the CCO allocates the short address to the node applying for network access, the addresses in the short address pool are allocated to the node applying for network access from small to large according to the sequence of the network access time of the node;
s2, setting a routing period; the CCO sets a routing period to be T seconds, and stipulates that each network access node needs to send a discovery list message for K times every T seconds;
s3, sending signals; the CCO sorts the network access nodes in the network access node set from small to large based on the size of the short address to obtain a sending queue, arranges the first M nodes in the sending queue to send a discovery list message in a TDMA time slot area in the superframe, and then deletes the M nodes from the sending queue;
steps S1 to S3 are repeated until the number of nodes in the transmission queue is zero.
2. The signal transmission method of a wideband carrier communication network as claimed in claim 1, wherein: time slots in the TDMA time slot zone are allocated as follows:
when the numerical value of the TDMA time slot length is not 0 and the TDMA time slot link identifier is an upgrade file, X + Y time slots in a TDMA time slot area are allocated to CCO, and the rest Y time slots are sequentially allocated to Y agent beacon signal transmitting nodes;
when the numerical value of the TDMA time slot length is not 0 and the TDMA time slot link identifier is a heartbeat detection message, sequentially allocating Y time slots in the TDMA time slot area to Y agent beacon signal sending nodes in a reverse order;
when the value of the TDMA time slot length is not 0 and the TDMA time slot link identifier is a discovery list message, P time slots in the TDMA time slot area are sequentially allocated to P proxy beacon signal transmitting nodes in an order from small to large according to short addresses, where P is (E2-E1+1), E1 is the short address of the node 1, and E2 is the short address of the node 2.
3. The signal transmission method of a wideband carrier communication network as claimed in claim 1, wherein: in step S1, if there is a node offline in the network operation process, the CCO recovers the address of the offline node and allocates the recovered address to a new node applying for network entry.
4. The signal transmission method of a wideband carrier communication network according to claim 1, wherein: and if M is a non-integer, rounding up.
5. The signal transmission method of a wideband carrier communication network according to claim 1, wherein: and when the number of the nodes in the sending queue is zero, generating the sending queue again based on the network access node set, and then adopting the same arrangement mechanism to arrange the sending again.
6. The signal transmission method of a wideband carrier communication network according to claim 1, wherein: for reserved bit 1 and reserved bit 2 in a time slot allocation message field adopting the national network standard, when the value of the reserved bit 1 is all zero, the reserved bit 1 is meaningless, and when the value is not all zero, the reserved bit 1 represents a part of short addresses of the node 1; when the value of the reserved bit 2 is zero, the value is meaningless, the first 2 bits of the non-zero bit represent the residual part of the short address of the node 1, the 3 rd to 14 th bits represent the short address of the node 2, and the last 2 bits are all zero;
for the reserved bits in the time slot allocation information field adopting the south network standard, when the value of the reserved bits is all zero, the first 12 bits of the reserved bits represent the short address of the node 1, the 13 th to 24 th bits represent the short address of the node 2, and the last 8 bits are all zero.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112543040A (en) * | 2020-11-27 | 2021-03-23 | 重庆邮电大学 | Efficient BPLC network networking method |
| CN113644936A (en) * | 2021-07-06 | 2021-11-12 | 珠海中慧微电子有限公司 | Three-phase parallel communication method of broadband carrier communication network |
| CN113676885A (en) * | 2021-08-20 | 2021-11-19 | 青岛鼎信通讯股份有限公司 | TDMA time slot dividing method based on beacon indication |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2400667A1 (en) * | 2010-06-23 | 2011-12-28 | Gigle Networks Limited | Communications network and method therefor |
| CN103457900A (en) * | 2013-09-03 | 2013-12-18 | 清华大学 | Multi-frequency networking method and device based on OFDM in power line communication system |
| US20140289380A1 (en) * | 2000-03-27 | 2014-09-25 | Tri-County Excelsior Foundation | Personal area network apparatus |
| CN106100698A (en) * | 2016-06-12 | 2016-11-09 | 南京南瑞集团公司 | A kind of network-building method being applied to the power line carrier module that power information gathers |
| CN106506043A (en) * | 2016-11-04 | 2017-03-15 | 重庆邮电大学 | Data transmission method, control device and equipment in a kind of PLC system |
| CN108419297A (en) * | 2018-01-19 | 2018-08-17 | 京信通信系统（中国）有限公司 | Wireless communications method and radio reception device, network planning equipment, terminal device |
| CN111147105A (en) * | 2019-12-19 | 2020-05-12 | 珠海中慧微电子有限公司 | Communication method of slave metering module |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9351301B2 (en) * | 2012-08-16 | 2016-05-24 | Daniel Chonghwan LEE | Maintenance of time slot usage indicators and self-organizing networking |
| CN109151951B (en) * | 2018-08-09 | 2021-01-19 | 中软电科智能技术有限公司 | Data interaction method for multi-frequency centralized network networking |
| CN110661551B (en) * | 2019-09-29 | 2021-08-13 | 南方电网科学研究院有限责任公司 | Method for adaptively adjusting beacon period time slot number |
| CN111970030B (en) * | 2020-07-22 | 2021-06-29 | 珠海中慧微电子有限公司 | Signal transmitting method of broadband carrier communication network |
-
2020
- 2020-07-22 CN CN202010710775.3A patent/CN111970030B/en active Active
-
2021
- 2021-04-05 WO PCT/CN2021/085514 patent/WO2022016906A1/en active Application Filing
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140289380A1 (en) * | 2000-03-27 | 2014-09-25 | Tri-County Excelsior Foundation | Personal area network apparatus |
| EP2400667A1 (en) * | 2010-06-23 | 2011-12-28 | Gigle Networks Limited | Communications network and method therefor |
| CN103457900A (en) * | 2013-09-03 | 2013-12-18 | 清华大学 | Multi-frequency networking method and device based on OFDM in power line communication system |
| CN106100698A (en) * | 2016-06-12 | 2016-11-09 | 南京南瑞集团公司 | A kind of network-building method being applied to the power line carrier module that power information gathers |
| CN106506043A (en) * | 2016-11-04 | 2017-03-15 | 重庆邮电大学 | Data transmission method, control device and equipment in a kind of PLC system |
| CN108419297A (en) * | 2018-01-19 | 2018-08-17 | 京信通信系统（中国）有限公司 | Wireless communications method and radio reception device, network planning equipment, terminal device |
| CN111147105A (en) * | 2019-12-19 | 2020-05-12 | 珠海中慧微电子有限公司 | Communication method of slave metering module |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022016906A1 (en) * | 2020-07-22 | 2022-01-27 | 珠海中慧微电子有限公司 | Signal sending method for broadband carrier communication network |
| CN112543040A (en) * | 2020-11-27 | 2021-03-23 | 重庆邮电大学 | Efficient BPLC network networking method |
| CN115242575A (en) * | 2021-04-22 | 2022-10-25 | 广州汽车集团股份有限公司 | CANFD network-based message processing method, device, equipment and storage medium |
| CN115242575B (en) * | 2021-04-22 | 2023-10-03 | 广州汽车集团股份有限公司 | Packet processing method, device, equipment and storage medium based on CANFD network |
| CN113644936A (en) * | 2021-07-06 | 2021-11-12 | 珠海中慧微电子有限公司 | Three-phase parallel communication method of broadband carrier communication network |
| CN113676885A (en) * | 2021-08-20 | 2021-11-19 | 青岛鼎信通讯股份有限公司 | TDMA time slot dividing method based on beacon indication |
| CN113676885B (en) * | 2021-08-20 | 2023-10-10 | 青岛鼎信通讯股份有限公司 | Time slot dividing method based on TDMA |
| CN113724485A (en) * | 2021-09-03 | 2021-11-30 | 重庆邮电大学 | Rapid intensive information acquisition method |
| CN113905480A (en) * | 2021-10-19 | 2022-01-07 | 重庆新源辉光电科技有限公司 | Underwater lamp system based on power line carrier technology |
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|---|---|
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| CN111970030B (en) | 2021-06-29 |
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