CN114143899B - Channel access method of broadband carrier network - Google Patents
Channel access method of broadband carrier network Download PDFInfo
- Publication number
- CN114143899B CN114143899B CN202111396982.7A CN202111396982A CN114143899B CN 114143899 B CN114143899 B CN 114143899B CN 202111396982 A CN202111396982 A CN 202111396982A CN 114143899 B CN114143899 B CN 114143899B
- Authority
- CN
- China
- Prior art keywords
- time slot
- node
- allocation
- subframe
- network
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 101100172132 Mus musculus Eif3a gene Proteins 0.000 claims abstract description 66
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 230000011664 signaling Effects 0.000 claims description 19
- 230000008054 signal transmission Effects 0.000 claims description 14
- 230000002860 competitive effect Effects 0.000 claims description 4
- 230000006855 networking Effects 0.000 claims description 3
- 230000036961 partial effect Effects 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 27
- 238000010586 diagram Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/02—Hybrid access
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
- H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
A channel access method of broadband carrier network, CCO starts timing from 0 and runs the beacon period sequentially, a beacon period includes N+1 identical subframes, a subframe is made up of CSMA time slot area, TDMA time slot and assigned time slot area; the CCO transmits a central beacon signal in subframe 0 of each beacon period; monitoring a beacon signal when a non-CCO node in the network is not connected with the network, and competing and transmitting a network connection application signal in a CSMA mode on a CSMA time slot area of each subframe of a beacon period or an allocation time slot area set as a CSMA time slot by an allocated node so as to connect with the network; after the non-CCO node is accessed to the network, if the proxy node list is on the proxy node list, transmitting a proxy beacon signal on the TDMA time slot area of the corresponding subframe, otherwise, transmitting a discovery beacon signal on the TDMA time slot area of the corresponding subframe; and when the network node has the transmission requirement of the non-beacon signal, selecting different modes to access the channel according to the requirement. The application can improve the communication performance of the network.
Description
Technical Field
The application belongs to the technical field of broadband carrier communication, and particularly relates to an improved channel access method for a broadband carrier network.
Background
The carrier communication technology uses a power line as a channel for signal transmission, and is widely applied to domestic power grid systems by virtue of the natural connection. Compared with the prior generation narrowband carrier communication technology, the broadband carrier communication technology has the advantages of strong anti-interference capability, high communication rate and the like. The China power grid and the south power grid serve as two main power grid operation enterprises in China, so that research on carrier communication technology is greatly promoted, and respective broadband carrier communication standards are issued in 2017 by the China power grid and the south power grid in order to better meet the information acquisition business requirements of an automatic carrier meter reading system of the intelligent electric meter: the technical specifications of high-speed carrier communication interconnection of the low-voltage power line and the technical requirements of broadband carrier communication of a concentrated meter reading system of a low-voltage power user. Although the two standards have some differences in some details, the basic protocol frames tend to be the same, and the above standards provide detailed protocol specification for the service layer, the data link layer and the physical layer, thus laying a foundation for mass production and application of related communication equipment. With the official promulgation of broadband carrier communication standards in 2017, a large number of relevant carrier communication modules are purchased and deployed by the power grid management and operation department in China at present, and the annual equipment purchase amount reaches the level of one hundred million yuan. However, from the actual running situation of the devices in each area of the whole country, although the running performance of the new network is obviously improved compared with that of the old network, an obvious problem still exists, namely, the utilization efficiency of the whole network to the physical layer broadband high-speed transmission capability is very low, and a larger performance improvement space exists.
Disclosure of Invention
The application aims to provide an improved channel access method of a broadband carrier network, which improves a channel intervention scheme of signals under the existing standard protocol framework so as to improve the communication performance of the network.
In order to achieve the above object, the present application adopts the following technical solutions:
a channel access method of broadband carrier network, after CCO is powered on, start networking, comprising the following steps:
s1, performing network timing by CCO from 0, and sequentially running each beacon period, wherein one beacon period comprises a subframe 0, a subframe 1, a subframe 2, …, a subframe N and a total of n+1 subframes, N represents the number of nodes in a white list, the length and the structure of each subframe are the same, and one subframe consists of a CSMA time slot area, a TDMA time slot area and an allocation time slot area;
s2, CCO transmits a central beacon signal in the subframe 0 of each beacon period, the TDMA time slot of the subframe 0 is allocated to a preamble signal and a frame control signal of the central beacon signal, and the allocation time slot is allocated to a frame load signal of the central beacon signal;
s3, when a non-CCO node in the network is not connected to the network, synchronizing and network parameters are obtained by monitoring a beacon signal, and network connection application signals are sent in a competition mode in a CSMA (physical uplink access) mode on a CSMA time slot area of each subframe of a beacon period or an allocation time slot area set as a CSMA time slot by an allocated node so as to complete network connection, wherein the beacon signal comprises a central beacon signal, an agent beacon signal and a discovery beacon signal;
s4, after the non-CCO node in the network completes network access, the using right of the TDMA time slot area of the corresponding subframe and the allocation right of the allocation time slot area are obtained based on the short address allocated by the CCO, if the non-CCO node is on the proxy node list, a proxy beacon signal is sent on the TDMA time slot area of the corresponding subframe, and if the non-CCO node is not on the proxy node list, a discovery beacon signal is sent on the TDMA time slot area of the corresponding subframe;
s5, for the network-accessed node, when the network-accessed node generates a transmission demand of a non-beacon signal, selecting one of the following 4 modes for channel access:
1) The CSMA competition mode is used for carrying out signal transmission on a CSMA time slot area of each subframe;
2) Waiting for the arrival of the sub-frame allocated to the self, then allocating time slot resources required by signal transmission for the self in an allocation time slot area through a beacon signal, and carrying out signal transmission on the allocated allocation time slot area;
3) Waiting for a certain neighbor node to allocate time slot resources to the neighbor node on a subframe of the neighbor node, and transmitting signals on an allocated time slot area allocated to the neighbor node;
4) And the allocated time slot area of the subframe of a certain neighbor node is set as a CSMA time slot area to carry out signal transmission in a CSMA competition mode.
Furthermore, the length of the CSMA time slot area in the subframe is T1, the T1 is autonomously decided by the CCO and announced in the beacon signal, and all nodes can perform contention transmission of their own signals in the CSMA time slot area in a CSMA contention manner.
Further, the length of the TDMA time slot in the subframe is T2, where T2 is equal to the sum of the length of the preamble signal and the frame control signal when the physical layer transmits 1 signal.
Further, the TDMA time slot is allocated by a short address of the network access node, the short address of the CCO defaults to 0, when the CCO performs the short address allocation of the network access application node, the allocation range is [1, n ], the node with the short address k is the allocation node of the kth subframe, and if the node with the address is not network access, the TDMA time slot and the corresponding subframe are managed by the CCO.
Further, the length of the allocated time slot area in the subframe is the same as that of the CSMA time slot area.
Further, the usage mode of the assigned time slot area of one subframe includes: the allocation node uses the allocation time slot area of the allocation node, or the allocation node uses the allocation time slot area of the allocation node for partial one-hop neighbor nodes of the allocation node, or the allocation node sets the allocation time slot area of the allocation node as a CSMA time slot, so that the one-hop neighbor nodes of the allocation node use the CSMA competition mode, or the combination of the three modes.
Further, the content of the time slot allocation message field in the signaling content of the central beacon signal is defined as the following table:
further, the network non-CCO node determines the timing of the message content with the proxy node message number and updates its own proxy node list based on the latest message content.
Further, the content of the allocation message of the allocation slot area is defined as the following table:
further, the allocation node only has the allocation and use right of the resources of the allocation time slot area of the self subframe, and the sum of the time lengths of the time slot resources allocated to the self and the neighbor nodes is not more than the length of the CSMA time slot area in the subframe.
According to the technical scheme, the method of the application provides an improved channel access scheme aiming at the broadband carrier communication network, designs a new super frame time slot structure and corresponding time slot allocation and channel access rules, can more efficiently meet the operation and maintenance requirements of a network beacon system and tree topology, and simultaneously, the new CSMA+TDMA mixed channel access rules can better coordinate the channel access process of network node signals, reduce collision probability, thereby effectively improving the communication performance of the whole network.
Drawings
In order to more clearly illustrate the embodiments of the present application, the following description will briefly explain the embodiments or the drawings required for the description of the prior art, it being obvious that the drawings in the following description are only some embodiments of the present application and that other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic diagram of a tree network topology of a broadband carrier network;
fig. 2 is a schematic diagram of division of a superframe time slot structure in a standard of a national network "high-speed carrier communication interconnection of power lines";
fig. 3 is a schematic signal structure of a beacon signal;
FIG. 4 is a schematic diagram of the content definition of non-central beacon information;
fig. 5 is a schematic diagram illustrating division of a superframe slot structure according to the present application;
fig. 6 is a schematic diagram of the time length of TDMA time slots in a superframe according to the present application;
fig. 7 is a functional diagram of a superframe structure according to the present application after allocation of an allocation slot area.
Detailed Description
In describing embodiments of the present application in detail, the drawings showing the structure of the device are not to scale locally for ease of illustration, and the schematic illustrations are merely examples, which should not limit the scope of the application. It should be noted that the drawings are in simplified form and are not to scale precisely, but rather are merely intended to facilitate and clearly illustrate the embodiments of the present application. Meanwhile, in the description of the present application, the terms "first", "second", etc. are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated; the terms "forward," "reverse," "bottom," "upper," "lower," and the like are used for convenience in describing and simplifying the description only, and do not denote or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application.
As shown in fig. 1, the broadband carrier network generally forms a multi-level association tree network with a concentrator (CCO) as a center and a proxy node (PCO) as a relay proxy, connecting all the Slave Stations (STAs). The CCO acts as a central control node for network operation, using a superframe time slot structure based on beacon periods for network communication, while using beacon signals to maintain synchronization and orderly operation throughout the network. In the technical specification of interconnection and interworking of high-speed carrier communication of a low-voltage power line in a national network, as shown in fig. 2, the time slot division condition of a superframe includes 4 time slots, and the time slots are respectively: beacon slot area, TDMA slot area, CSMA slot area, and binding CSMA slot area. Similar structure is adopted for time slot division of a super frame in the technical requirement of broadband carrier communication of a concentrated meter reading system of a low-voltage power user of the south network, and the ordering of 4 time slots is different, and the method comprises the following steps of: the beacon slot area, the CSMA slot area, the TDMA slot area and the binding CSMA slot area, but since the TDMA slot area and the binding CSMA slot area are generally used only when the network is remotely upgraded in two standard protocols, the beacon period actually only comprises the beacon slot area and the CSMA slot area when the network normally communicates, and the lengths of the other two slot areas are set to 0, so that the slot ordering of the two protocols is virtually the same.
CCO achieves synchronous orderly management of the entire network slot structure by using beacon signals of 3 types: a central beacon signal, a proxy beacon signal, and a discovery beacon signal. At the starting time position of each beacon period, the CCO starts to transmit a central beacon signal, and the signal signaling content of the CCO carries time slot parameter information and network management information of the beacon period. The time slot parameter information includes the time length of the beacon time slot, the number of three types of beacon signal time slots (X, Y and Z values), the network short addresses (TEI) of Y+Z transmitting nodes corresponding to the Y proxy beacon time slots and Z discovery beacon time slots, and the relevant parameters of the CSMA time slot area and the binding CSMA time slot area.
After receiving the beacon signal sent by another node, one node in the network will relay the proxy beacon signal or find the beacon signal on its own time slot after the time of the beacon time slot arrives if it finds itself to be a member of the above-mentioned y+z sending nodes by the analysis of the signaling content and the beacon time slot allocated by itself has not arrived on the time axis. Based on this mechanism and selection of a suitable proxy relay node, the central coordinator can utilize the x+y+z beacon slots to implement downlink whole network broadcast transmission of its own beacon signaling information in one beacon period.
The physical layer of the broadband carrier adopts the same signal structure in all types of signals including the central beacon signal, the proxy beacon signal and the discovery beacon signal, as shown in fig. 3, when the signals are transmitted at one time, the signal structure includes a preamble signal, a frame control signal and a frame load signal. The preamble signal is used for signal acquisition and synchronization, and the frame control signal uses a modulation coding scheme defined in advance and uses a physical block with a length of 16 bytes. The signaling content in the frame control signal further indicates the physical layer format of the following frame payload signal in addition to the basic information such as the network name and the network time information, so as to help the receiving end to correctly receive and parse the content of the frame payload signal (the application does not relate to the frame control signal, and therefore does not describe the signaling content of the signal in detail). Both the national and south network protocols specify that they support only one physical block of 136 bytes or one 520 bytes in length for the frame payload signal. The definition of the payload field is shown in table 1, the definition of the beacon management information in the payload field is shown in table 2, the definition of the management information type in the beacon management information is shown in table 3, and the definition of the time slot allocation message in the management information type is shown in table 4. The design idea of the south network standard for the time slot allocation information is basically consistent with that of the national network, and the national network standard is taken as an example for illustration.
Table 1 definition of beacon signal payload field
Table 2 field definitions of beacon management messages
TABLE 3 type definition and content specification of management messages
Table 4 content definition of time slot assignment message field
As can be seen from the definition of the analysis slot allocation message described above, the maximum value of the sum of the lengths of the other contents is 44 bytes (the network is a three-phase carrier network) except for the non-central beacon information portion. And the length of the non-central beacon information is a dynamic value (the definition of the content of the non-central beacon information is shown in fig. 4), and the information carried by the non-central beacon information is the allocation information for indicating y+z non-central beacon slots, including the short address of the allocation node of the slot and the beacon type of the slot. As can be seen from the definition and content description of the management message in table 3, the station capability message, the routing parameter message and the frequency band change message are all of a fixed length and have smaller values, and in the extreme case that all the three types of messages are transmitted (in practical application, if the network needs to transmit the frequency band change message, it means that the network will be reinitialized and networked on a new frequency band soon, and it is not necessary to transmit the station capability message and the routing parameter message again), the sum of the content lengths is only 25 bytes; the content length of the time slot allocation message is a dynamic value, and the length of the time slot allocation message is the signaling content with the largest content length in the load field. Since TDMA slot areas cannot be used, any other type of signal of the network node must be transmitted in the CSMA slot areas or the binding CSMA slot areas except for the beacon signal, so that each node must know key information such as the start position and the end position of the slot areas in the beacon period just before the slot areas come, otherwise, the signal cannot be transmitted, so that the CCO must implement the whole network broadcasting before the end of the beacon slot in the beacon period with respect to the slot parameter information in the beacon period. To meet this information transmission requirement, in the non-central beacon information, the selection of the proxy node set must ensure that the sum of the coverage of its beacon relay signals is to include all the network-entered nodes, while the function of discovery beacon signals includes the functions of performing guidance of non-network-entered nodes and topology discovery and quality detection between network-entered nodes, so that all STAs need to periodically perform transmission of discovery beacon signals.
As the number of network nodes increases, the number of non-central beacon slots increases, resulting in an increase in the length of the non-central beacon information field. When the value of X reaches about 30 (when the number of network nodes in a typical topology network is greater than 80, the value of X is also greater than 30), the length of the beacon load field exceeds the carrying capacity of 136 bytes of physical blocks, the network nodes are forced to use 520 bytes of physical blocks with the largest block length in the physical layer, so that the length of the beacon signal is very large, the channel overhead of the signaling is greatly increased, and the situation that the length of the signaling signal is greater than that of the service signal occurs in the network. That is, the definition of the signaling field for the payload signal by both protocols has the following drawbacks: since the length of the signaling content increases rapidly with the size of the network nodes, when the number of nodes in the whole network is slightly larger (typically, the network topology includes about 80 nodes, and most of the network nodes reach more than one hundred), the length of the signaling content exceeds the information carrying capacity of 136-byte physical blocks, so that the load signal of the beacon is forced to select the 520-byte physical block with the largest physical layer length. In the automatic network of the intelligent ammeter, the length of the service data message is only about 100 bytes, so the design defect can cause the length of the beacon signal to be too long and occupy very large channel overhead, the phenomenon that the length of the signaling signal is larger than that of the service signal can occur in the communication network, which obviously deviates from the most basic design concept of the network signal, namely the signaling signal should be shorter in length, high in reliability and better in communication robustness than that of the service signal.
From the above analysis, the channel access method of the existing broadband carrier network has the following disadvantages:
1) The superframe structure is too complex: the method has the advantages that a plurality of time slot parameters are required to be set, the method looks flexible, is very complicated in practice, and brings great trouble to protocol development, performance test and qualitative analysis of network performance;
2) The service delay is larger: a large number of beacon time slots are closely connected, so that the length of a beacon time slot area is longer, and during the period, a node cannot transmit service, so that a larger waiting time delay can occur for data service generated in the time period;
3) The overhead of the beacon slot is large: because the time slot structure of the beacon period is complex and the parameters are numerous, the beacon signal needs to be described by using a larger amount of signaling content, so that the length of the beacon signal is longer and more channel resources are occupied;
4) The channel access protocol is less efficient: all other types of signals of the network node except the beacon signals are transmitted in a CSMA competition access mode, and under the scene of higher network traffic load, the probability of signal collision is increased dramatically, so that the network throughput is reduced.
Based on the beacon system and the tree topology frame of the existing protocol, the superframe time slot structure and the time slot allocation and channel access rules corresponding to the superframe time slot structure are redesigned, and the utilization efficiency of channel resources is improved by improving the channel access protocol. As shown in fig. 5, the superframe structure of the present application is: one beacon period consists of n+1 subframes (subframes 0,1,2, …, N), each subframe has the same length and structure, where N represents the number of nodes in a white list, which is a preset MAC address list of legal nodes, and only nodes on the white list are allowed to join the network. Each subframe consists of a CSMA time slot area, a TDMA time slot and an allocation time slot area, wherein the length of the CSMA time slot area is T1, a specific value of T1 is autonomously decided by a CCO and announced in a beacon signal, all nodes in a CSMA time slot area network can perform competitive transmission of various types of signals of the nodes per se according to the need in a CSMA competition mode, and T1 is an empirical value and is generally decided according to the number of network nodes and the current network service load condition; the length of the TDMA time slot is T2, T2 is a fixed value, and the fixed value is equal to the sum of the length of a preamble signal and the length of a frame control signal when the physical layer transmits 1 signal; the allocated slot region has the same length as the CSMA slot region and is also T1. The use and utilization mode of the assigned time slot area of one subframe is scheduled by the assigned node of the subframe, and the use mode comprises the following steps: the allocation node uses the allocation time slot area, or uses the allocation time slot area for part of one-hop neighbor nodes, or sets the allocation time slot area as CSMA time slot, so that the one-hop neighbor nodes use in a CSMA competition mode, or the combination of the three modes. As shown in fig. 6, the 1 st signaling of the physical layer of the wideband carrier consists of three parts: the preamble, frame control and frame payload, the signal format of the first two parts is fixed and thus its length is also fixed. The TDMA time slot is allocated by the short address of the network access node (the short address of the CCO defaults to 0, the allocation range is limited to [1, n ]) when the CCO performs the short address allocation of the network access application node, the node with the short address k is the allocation node of the kth subframe, and if the node with the address is not network access, the time slot and the corresponding subframe are managed by the CCO.
Based on the superframe structure, the channel access method of the present application comprises the following steps: after CCO is powered on, networking is started;
s1, starting network timing from 0 by CCO, and sequentially running each beacon period based on the number of the pre-stored white list nodes and a preset T1 value;
s2, the CCO transmits a central beacon signal in a subframe 0 of each beacon period, wherein a TDMA time slot of the subframe in the beacon period is allocated to a preamble signal and a frame control signal of the central beacon signal, and the allocation time slot is allocated to a frame load signal; meanwhile, the signaling content of the central beacon signal is the content of the time slot allocation message, the other content continues to use the content of the existing broadband carrier communication standard, the new definition of the time slot allocation message is shown in table 5, the network non-CCO node judges the time sequence of the message content by the agent node message number, and the self agent node list is updated based on the latest message content.
Table 5 content definition of time slot assignment message field
S3, when a network non-CCO node does not access the network, acquiring synchronization and network parameters by monitoring a beacon signal, wherein the content of the network parameters comprises a network name, whether a new node is allowed to access the network, time position and the like of a CSMA time slot area used for transmitting access application signals, then starting to transmit the access application signals in a competition mode of CSMA on the CSMA time slot area of each subframe or an allocation time slot area set as the CSMA time slot by an allocated node, and completing a network access process, wherein the network access process is the same as the specific method of the existing broadband carrier communication protocol about the node network access process, and the details are not repeated here;
s4, after the network non-CCO node finishes network access, the use right of the TDMA time slot area of the corresponding subframe and the allocation right of the subsequent allocation time slot area are obtained based on the short address allocated by the CCO, if the non-CCO node is a member on the proxy node list, the non-CCO node sends a proxy beacon signal on the TDMA time slot area, and if the non-CCO node is not on the proxy node list, the non-CCO node sends a discovery beacon signal on the TDMA time slot area; the signaling content difference carried by the agent beacon signal and the discovery beacon signal refers to the existing wideband carrier communication protocol, and is not repeated here;
further, in the management message of the beacon signal, a message which has to be sent, namely an allocation message of an allocation time slot area, is added on the basis of the existing protocol, the content length is a dynamic value, and the function of the allocation node of the current subframe is to inform the neighboring nodes of the allocation content of the allocation time slot area of the current subframe, and the definition of the content is shown in table 6. Since the allocation node only has the allocation and use right of the resources of the allocation time slot area of the self subframe, the sum of the time lengths of the time slot resources allocated to the self and the neighbor nodes cannot be larger than T1. The function diagram of the allocated time slot area after allocation is shown in fig. 7.
Table 6 content definition of allocation message for allocation slot region
S5, for the network-accessed node, if the network-accessed node generates a transmission demand of a non-beacon signal, one of the following 4 modes can be selected as required for channel access:
1) The CSMA competition mode is used for carrying out signal transmission on a CSMA time slot area of each subframe;
2) Waiting for the arrival of the sub-frame allocated by the user, then allocating time slot resources required by signal transmission for the user in an allocation time slot area through a beacon signal, and carrying out signal transmission on the allocated allocation time slot area, thereby ensuring no conflict in the signal transmission process;
3) Waiting for a certain neighbor node to allocate time slot resources to the neighbor node on a subframe of the neighbor node, and transmitting signals on an allocated time slot area;
4) And the allocated time slot area of the subframe of a certain neighbor node is set as a CSMA time slot area to carry out signal transmission in a CSMA competition mode.
The channel access protocol determines the utilization efficiency of channel resources to a great extent, and the novel super frame designed by the method has simple and stable structure and basically does not influence the stability of network operation under the condition that part of beacon signals are lost. The method simplifies the time slot structure of the beacon period, greatly reduces the relevant time slot parameters needed to be carried by the beacon signal, and can effectively reduce the length of the beacon signal and reduce the channel overhead. Compared with the prior broadband carrier channel access scheme, the application can provide richer choices for the channel access of non-beacon signals, about half of channel resources continue to use the traditional CSMA competitive access mode, and the rest of channel resources are evenly distributed to network access nodes, and each node independently decides a time slot utilization strategy, so that each node can allocate time slot resources as required for discovery list messages and heartbeat messages which need to be periodically transmitted on own subframes through the allocation message of an allocation time slot area provided by the table 6, thereby ensuring the non-conflict of the transmission process of the signals and avoiding the transmission conflict of the signals to other types of signals in the CSMA time slot area; meanwhile, when the network has no data acquisition requirement, CSMA time slot areas uniformly distributed on a time axis can ensure low time delay of network burst service (such as power failure report message) transmission; when the network has the data acquisition requirement of the whole network ammeter with larger service load level, the whole network node can flexibly select and flexibly switch between collision-free channel access on an allocated time slot area on a subframe of the whole network node and collision-free channel access on a CSMA time slot area according to the requirement. Compared with the existing simple CSMA competitive channel access mode of the broadband carrier protocol, the mixed channel access mode of the application can better ensure the time order of signals in dense communication of a large number of nodes, reduce the high throughput of a channel realization network, and provide a better communication guarantee basis for dense acquisition of data.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. 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 application. Thus, the present application 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 (10)
1. The channel access method of the broadband carrier network starts networking after CCO is electrified, and is characterized by comprising the following steps:
s1, performing network timing by CCO from 0, and sequentially running each beacon period, wherein one beacon period comprises a subframe 0, a subframe 1, a subframe 2, …, a subframe N and a total of n+1 subframes, N represents the number of nodes in a white list, the length and the structure of each subframe are the same, and one subframe consists of a CSMA time slot area, a TDMA time slot area and an allocation time slot area;
s2, CCO transmits a central beacon signal in the subframe 0 of each beacon period, the TDMA time slot of the subframe 0 is allocated to a preamble signal and a frame control signal of the central beacon signal, and the allocation time slot is allocated to a frame load signal of the central beacon signal;
s3, when a non-CCO node in the network is not connected to the network, synchronizing and network parameters are obtained by monitoring a beacon signal, and network connection application signals are sent in a competition mode in a CSMA (physical uplink access) mode on a CSMA time slot area of each subframe of a beacon period or an allocation time slot area set as a CSMA time slot by an allocated node so as to complete network connection, wherein the beacon signal comprises a central beacon signal, an agent beacon signal and a discovery beacon signal;
s4, after the non-CCO node in the network completes network access, the using right of the TDMA time slot area of the corresponding subframe and the allocation right of the allocation time slot area are obtained based on the short address allocated by the CCO, if the non-CCO node is on the proxy node list, a proxy beacon signal is sent on the TDMA time slot area of the corresponding subframe, and if the non-CCO node is not on the proxy node list, a discovery beacon signal is sent on the TDMA time slot area of the corresponding subframe;
s5, for the network-accessed node, when the network-accessed node generates a transmission demand of a non-beacon signal, selecting one of the following 4 modes for channel access:
1) The CSMA competition mode is used for carrying out signal transmission on a CSMA time slot area of each subframe;
2) Waiting for the arrival of the sub-frame allocated to the self, then allocating time slot resources required by signal transmission for the self in an allocation time slot area through a beacon signal, and carrying out signal transmission on the allocated allocation time slot area;
3) Waiting for a certain neighbor node to allocate time slot resources to the neighbor node on a subframe of the neighbor node, and transmitting signals on an allocated time slot area allocated to the neighbor node;
4) And the allocated time slot area of the subframe of a certain neighbor node is set as a CSMA time slot area to carry out signal transmission in a CSMA competition mode.
2. The channel access method of a broadband carrier network according to claim 1, wherein: and the length of a CSMA time slot area in the subframe is T1, the T1 is autonomously decided by the CCO and announced in a beacon signal, and all nodes can perform competitive transmission of own signals in a CSMA competition mode in the CSMA time slot area.
3. The channel access method of a broadband carrier network according to claim 1, wherein: the length of the TDMA time slot in the subframe is T2, and T2 is equal to the sum of the length of the preamble signal and the frame control signal when the physical layer transmits 1 signal.
4. A method of channel access for a broadband carrier network according to claim 3, characterized by: the TDMA time slot is allocated by a short address of a network access node, the short address of the CCO defaults to 0, when the CCO performs short address allocation of a network access application node, the allocation range is [1, N ], the node with the short address of k is the allocation node of the kth subframe, and if the node with the address is not network access, the TDMA time slot and the corresponding subframe are managed by the CCO.
5. The channel access method of a broadband carrier network according to claim 1, wherein: the length of the allocated time slot area in the subframe is the same as that of the CSMA time slot area.
6. The channel access method of a broadband carrier network according to claim 1, wherein: the use mode of the assigned time slot area of one subframe comprises the following steps: the allocation node uses the allocation time slot area of the allocation node, or the allocation node uses the allocation time slot area of the allocation node for partial one-hop neighbor nodes of the allocation node, or the allocation node sets the allocation time slot area of the allocation node as a CSMA time slot, so that the one-hop neighbor nodes of the allocation node use the CSMA competition mode, or the combination of the three modes.
7. The channel access method of a broadband carrier network according to claim 1, wherein: the content of the time slot allocation message field in the signaling content of the central beacon signal is defined as the following table:
8. the channel access method of a broadband carrier network according to claim 7, wherein: the network non-CCO node determines the timing of the message content with the proxy node message number and updates its own proxy node list based on the latest message content.
9. A channel access method based on a broadband carrier network according to claim 1, characterized in that: the content of the allocation message of the allocation slot area is defined as the following table:
10. a channel access method based on a broadband carrier network according to claim 1, characterized in that: the allocation node only has the allocation and use right of the resources of the allocation time slot area of the self subframe, and the sum of the time lengths of the time slot resources allocated to the self and the neighbor nodes is not more than the length of the CSMA time slot area in the subframe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111396982.7A CN114143899B (en) | 2021-11-23 | 2021-11-23 | Channel access method of broadband carrier network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111396982.7A CN114143899B (en) | 2021-11-23 | 2021-11-23 | Channel access method of broadband carrier network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114143899A CN114143899A (en) | 2022-03-04 |
| CN114143899B true CN114143899B (en) | 2023-10-13 |
Family
ID=80391011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111396982.7A Active CN114143899B (en) | 2021-11-23 | 2021-11-23 | Channel access method of broadband carrier network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114143899B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN115801111B (en) * | 2023-02-10 | 2023-04-25 | 成都戎星科技有限公司 | Method for realizing MF-TDMA signal user time slot data separation |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110661551A (en) * | 2019-09-29 | 2020-01-07 | 南方电网科学研究院有限责任公司 | Method for adaptively adjusting beacon period time slot number |
| CN113630814A (en) * | 2021-08-11 | 2021-11-09 | 中国电力科学研究院有限公司 | Cooperative communication method and device for multi-carrier network in same station area |
| 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 |
-
2021
- 2021-11-23 CN CN202111396982.7A patent/CN114143899B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110661551A (en) * | 2019-09-29 | 2020-01-07 | 南方电网科学研究院有限责任公司 | Method for adaptively adjusting beacon period time slot number |
| 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 |
| CN113630814A (en) * | 2021-08-11 | 2021-11-09 | 中国电力科学研究院有限公司 | Cooperative communication method and device for multi-carrier network in same station area |
Non-Patent Citations (3)
| Title |
|---|
| Ali Md Liton ; Zhi Ren ; Ren Dong ; Su Xin.An Efficient Networking Approach for Broadband PLC Networks.《2021 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB)》.2021,全文. * |
| 常素华 ; 田乐.基于HPLC双模通信的多方式一致性测试系统.《电测与仪表》.2021,全文. * |
| 王一芃.基于OPNET的WirelessHART工业标准建模.《中国优秀硕士学位论文全文数据库 信息科技辑》.2014,全文. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114143899A (en) | 2022-03-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111970031B (en) | Meter reading method based on broadband carrier communication network | |
| CN110856194B (en) | Dual-mode fusion networking method and communication method | |
| CN111970030B (en) | Signal transmitting method of broadband carrier communication network | |
| CN101689919B (en) | Method for implementing digital mobile radio private network communication, digital mobile radio private network communication terminal, relay station and system | |
| CN114143899B (en) | Channel access method of broadband carrier network | |
| CN100531076C (en) | Increasing link capacity via concurrent transmissions inc entralized wireless LANS | |
| US8089917B2 (en) | Method, system and apparatus of implementing inter-system communications | |
| CN111836399B (en) | Channel access protocol design method and time slot allocation method for broadband carrier communication network | |
| CN109151951B (en) | Data interaction method for multi-frequency centralized network networking | |
| US8861485B2 (en) | Self-organizing communications network and method for the operation thereof | |
| CN107483436B (en) | Physical layer dual-mode design method of communication module in Internet of things | |
| CN109951813B (en) | Networking method and meter reading method of energy metering network | |
| CN112492669A (en) | Wireless communication method and system for node equipment of power transmission and transformation equipment internet of things | |
| JP4680047B2 (en) | Wireless relay system and method | |
| EP1039696B1 (en) | Radio transmission in a local area network | |
| CN113644936B (en) | Three-phase parallel communication method of broadband carrier communication network | |
| CN111835881B (en) | Beacon signaling protocol design method for broadband carrier communication network | |
| CN114745613A (en) | Meter reading method for broadband carrier network | |
| CN115134354A (en) | Method for rapidly upgrading by using TDMA time slot | |
| CN113891479A (en) | Time slot estimation method based on beacon network | |
| CN111465100B (en) | Relay uplink access channel configuration method, configuration signaling and equipment | |
| CN114629529B (en) | Channel access method for broadband carrier communication network | |
| WO2019214670A1 (en) | Method and apparatus for determining time domain location information | |
| CN116743210A (en) | Communication method of broadband carrier communication network | |
| CN102111219B (en) | Method for controlling light loaded wireless network media access |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |