CN115955400A - Dual-mode fusion networking method - Google Patents

Abstract

The invention relates to a dual-mode fusion networking method, which belongs to the field of power user information acquisition and comprises the following steps: s1: issuing a white list to a Central Coordinator (CCO); s2: after a station STA receives a central beacon of a CCO (central beacon) or a discovery beacon of the STA in a broadband micropower BMP (bone marrow map) or broadband power line carrier communication (HPLC) mode, initiating an association request message according to an indication in the beacon; s3: after receiving an association request message of a station STA, the CCO accesses the white list, allocates the same terminal equipment identification TEI for the station allowing network access in two network modes, and replies an association confirmation message; s4: the CCO generates a site dynamic topology information record; s5: and the CCO judges whether the network needs to adjust NID for re-networking according to the TEI size.

Description

Dual-mode fusion networking method

Technical Field

The invention belongs to the field of electric power user information acquisition, and relates to a dual-mode fusion networking method.

Background

Broadband power line carrier (HPLC) refers to a communication technology that realizes high-speed data transmission using a power line itself and a power transmission network or a power distribution network formed by the power line as a transmission medium. Broadband power line communication is power line carrier communication in which the bandwidth is limited to 2 to 30MHz and the communication rate is usually 1Mbps or more. The power line can be directly utilized, rewiring is not needed, networking is simple and rapid, cost is low, and the application range is wide.

A Broadband Micropower (BMP) wireless communication system is a high-speed wireless network for realizing the convergence, transmission and interaction of power consumption information of low-voltage power users. The broadband carrier wave communication device is researched based on the technical specification of low-voltage power line broadband carrier wave communication proposed by national grid companies. The working frequency range is 470-510MHz, and the device has the characteristics of wide frequency band, low complexity, low cost, low power consumption, bidirectional real-time communication and the like. The chirp spread spectrum is used, so that the anti-interference capability is strong, the penetrability is strong, the transmission distance is long, the communication speed is high, and the method can be fused with a broadband power line carrier to form a multi-mode network.

At present, HPLC and BMP have certain application in power distribution communication networks, but have some problems at the same time. The power distribution and utilization network has a complex topological structure, multiple types and large quantity of power distribution and utilization equipment, a wide coverage range, a complex application scene, various service requirements and high transmission reliability requirements, and the communication requirements of the smart power grid cannot be completely met by singly adopting any communication mode of HPLC and BMP. The heterogeneous multi-channel fused by HPLC and BMP can realize the advantage complementation of the two channels, eliminate communication blind spots, enlarge the communication coverage range, meet the urgent requirements of the smart grid on high-performance and high-reliability communication, and is a key content to be researched.

And designing a communication protocol stack structure. The protocol stack design defines 3 layers, the physical layer, the data link layer, and the application layer. The data link layer is divided into a Media Access Control (MAC) sublayer and a network management sublayer, and the data link layer directly provides transmission service for the application layer. A communication protocol stack structure of an HPLC and BMP multimode converged network is drawn according to a communication protocol stack structure provided in a low-voltage power line broadband carrier communication technical specification, as shown in fig. 1, functions of each layer are defined as follows:

an application layer: and service data interaction between the local communication unit and the communication unit is realized, and data transmission is completed through a data link layer. The application layer needs to analyze data frames in the concentrator and the intelligent electric meter and convert the data frames into messages specified by the application layer in the protocol, so that the upper-layer application function is completed.

Data link layer: the method is divided into a network management sublayer and a media access control sublayer. The network management sublayer mainly realizes networking, network maintenance, routing management and convergence and distribution of application layer messages of the communication network. The media access control sublayer competes for the physical channel mainly through two channel access mechanisms of CSMA/CA and TDMA, and realizes reliable transmission of data messages.

Physical layer of HPLC: the method mainly realizes that the data message of the MAC sublayer is coded and modulated into a broadband carrier signal and sent to a power line medium; and receiving the broadband carrier signal of the power line medium, demodulating the broadband carrier signal into a data message, and delivering the data message to an MAC sublayer for processing.

BMP physical layer: the method mainly realizes that the data message of the MAC sublayer is coded and modulated into a broadband micropower wireless signal, and the broadband micropower wireless signal is sent to an analog front end and finally sent to a wireless channel; and receiving data received from the analog front end, adjusting, demodulating, decoding and the like the data to recover an original data message, and delivering the original data message to an MAC sublayer for processing.

For the electricity consumption information acquisition system, an HPLC (high performance liquid chromatography) wired communication system and BMP (bone map) wireless communication can be used as two independent working modes, and a multi-stage tree network is formed in a single working mode. And the communication system fused by HPLC and BMP forms a multi-hop self-organizing sensor network with bidirectional communication. The entire network forms a mesh topology as shown in fig. 2, where:

network Identification (NID), is a unique NID used to identify a high speed carrier communication network. Sites in the same high-speed carrier communication network, including a CCO, need to indicate NID in "frame control" of an MPDU when sending a message, indicating the high-speed carrier communication network to which the current message belongs.

When the CCO monitors that the NID of the network is consistent with the NID selected by the network in the inter-network coordination frame of other networks, the collision of the NIDs of the networks is indicated, and the negotiation is necessary. During negotiation, the CCO first sets a negotiation buffer period, which may be a random value in the range of 10ms to 10 s. The CCO continues to monitor inter-network coordination frames of the neighbor network during this negotiation buffering period. If the NID of the neighbor network is found to be different from the NID of the network in the negotiation buffering period, the original NID of the network is kept unchanged. If the NID of the neighbor network and the NID of the network are continuously conflicted until the negotiation buffer period expires, the CCO of the network acquires a new idle NID as the identifier of the network after the negotiation buffer period expires.

When the CCO determines that a new NID is enabled, the network must be re-networked. When the CCO reports a message through network conflict and learns that multiple network conflicts exist, the MAC address of the CCO can be compared firstly, if the MAC address of the network is larger, the existing NID can be kept unchanged, and if the conflict state lasts for more than 30 minutes, the NID of the network can be changed; when the MAC address of the network is smaller, the NID of the network can be changed in time, and a new idle NID is selected as the NID of the network. When the CCO completes a round of negotiation of NID and then the NID collision occurs again later, it needs to negotiate again according to the same procedure until the NID is different.

In a multimode network, the negotiation strategy for NIDs may be adjusted to the size of the currently assigned TEI, with the re-networking being accomplished by networks with smaller TEIs, which represent the size of the network at a lower cost.

In a multimode converged network, there are three types of beacon frames: central beacons, proxy beacons and discovery beacons. Beacon frames must be transmitted in beacon slots. Beacon slots are allocated by the CCO, and the allocation needs to indicate the corresponding slots that can be used by a specific STA. Where both the central beacon and the proxy beacons must be transmitted in each beacon period. Discovery of beacons requires each STA station to transmit at least two beacon frames every 170 second time period since joining the network. The CCO needs to transmit the central beacon frame in two modes respectively, the HPLC mode needs to transmit the central beacon frame on three phase lines a, B, and C, and the other nodes except the CCO need to transmit the corresponding beacon frames in the time slots assigned to the CCO in the respective modes.

After the sites access the network, each site is sequentially given a TEI (Terminal Equipment IDentifier) by the CCO in ascending order. Because beacons received by the same station in different modes are not the same time, the time when the STA constructs the association request is also different, and the association requests received by the CCO from the same station in two different modes are different in time and sequence. If the respective independent TEI distribution mechanism is adopted in the two modes of HPLC and BMP, the NWK layer needs to independently store all information in the two modes and simultaneously store information such as a dual-mode routing table, a neighbor table, a node information table and the like. The application layer and the MAC layer need to explicitly indicate the TEI in the corresponding mode for accessing data, which increases overhead. Therefore, HPLC and BMP adopt independent TEI allocation mechanism, which is not beneficial to the unified planning of dual-mode resources, increases the overhead, cannot embody the advantages of dual-mode fusion, and further influences the working performance of the whole multi-mode fusion system.

Disclosure of Invention

In view of the above, the present invention is directed to a TEI allocation scheme and a networking and network maintenance procedure.

In order to achieve the purpose, the invention provides the following technical scheme:

a dual-mode fusion networking method comprises the following steps:

s1: issuing a white list to a Central Coordinator (CCO);

s2: after a station STA receives a central beacon of a CCO (communication center of sequence) or a discovery beacon of the STA in a broadband micropower BMP (personal map) or broadband power line carrier communication (HPLC) mode, initiating an association request message according to an indication in the beacon;

s3: after receiving an association request message of a station STA, the CCO accesses the white list, allocates the same terminal equipment identification TEI for the station which is allowed to access the network in two network modes, and replies an association confirmation message;

s4: the CCO generates a site dynamic topology information record;

s5: and the CCO judges whether the network needs to adjust NID for re-networking according to the TEI size.

Further, in step S2, when the STA accesses the network, it first selects its proxy station through receiving and evaluating the network packet, and then initiates an association request packet according to the indication in the beacon, and initiates an association request under the condition that the "association start flag bit" of the beacon is 1, and when the station has no TEI, the corresponding source TEI in the packet is filled with 0.

Further, in step S3, after receiving the association request message, the MAC layer of the CCO parses the mode field information in the MPDU header, and uploads the mode field information to the network layer by using different interfaces according to the corresponding mode information to perform corresponding information processing;

the CCO firstly correspondingly finds out the MAC address in the white list according to the MAC address information of the eighteenth byte in the association request message;

if the white list does not contain the site, the CCO constructs an associated confirmation message for rejecting the network access request;

if the white list contains the site, the CCO judges the TEI distribution condition of the current site in the local mode or another mode according to the distributed condition field in the white list, distributes the correct TEI for the site, and constructs a correlation confirmation message allowing the network access request.

Further, the CCO determines the station dual-mode state through the following procedures:

judging whether the MAC address of the station is accessed to the network for the first time under the mode:

if not, directly inquiring the white list, replying the same TEI of the site in another mode, and replying the association confirmation message;

if yes, judging whether the network access condition is met, if so, distributing TEI to the station in sequence, replying association confirmation message, after association confirmation, recording the distributed TEI by a white list, when the same MAC address of another mode of the station requests for network access, inquiring the white list, replying the same TEI of the station under the mode, and replying the association confirmation message.

Further, the association request message of the site and the association confirmation message of the CCO can both be transmitted through the proxy site.

Further, the station judges whether the network access is successful according to a correlation confirmation message or a result in a correlation summary indication message sent by the CCO; if the association confirmation message or the association summary indication message is not received, the association request can be initiated again; if the network access request is rejected, the station may wait for a time interval according to the reassociation time and then request network access again, or may choose to switch the NID to another network and request network access again.

Further, step S5 specifically includes the following steps:

the CCO carries out competition coordination and NID coordination of the internetwork time slot through the internetwork coordination frame, when a site accesses the network, the state of a neighbor network is reported to the network through a network conflict report message, when the problem of NID conflict exists, the neighbor network entry is coordinated to carry the largest distributed TEI value of the neighbor network and report the TEI value to the CCO, and after the CCO analyzes the information, the CCO judges whether the network scale needs to adjust the NID for networking again.

The invention has the beneficial effects that: the invention keeps the consistency of BMP and HPLC dual-mode TEI, continuously changes and stores the information record, and can effectively reduce the frame overhead in the networking stage.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof.

Drawings

For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a diagram of a protocol stack level division for a broadband carrier communication network;

FIG. 2 is a multimode converged network topology;

FIG. 3 is a flowchart of CCO and site interaction;

fig. 4 is a flowchart for determining a station dual mode state.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and embodiments may be combined with each other without conflict.

Wherein the showings are for the purpose of illustration only and not for the purpose of limiting the invention, shown in the drawings are schematic representations and not in the form of actual drawings; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.

The invention provides a TEI distribution scheme and a networking and network maintenance flow, wherein a concentrator configures a CCO to execute a networking starting task: configuring a networking mode and a white list of sites; and configuring the period of the acquisition task.

White list format:

U8 node_mac_addr[6]；

U8 node_protocol_type；

U8 able_flag；//0xff vaild 0x00invaild

U16 tei；

U8 assigned；//0x00 bmp has been；0xff plc has been；0x0f both have been；0xf0 both not

as shown in fig. 3, the station receives a central beacon of the CCO or a discovery beacon of the STA in the BMP or HPLC mode. When an STA accesses a network, it first needs to select its proxy site through receiving and evaluating network messages, where the proxy site may be a CCO or other STA sites. The principle of selecting proxy sites is generally that the channel quality is better and the path to the CCO is shorter. After the agent station is selected, an association request message needs to be initiated according to the indication in the beacon, the association request can be initiated only under the condition that the 'association starting flag bit' of the beacon is 1, and when the station has no TEI, the corresponding source TEI in the message is filled with 0.

The definition of the association request message (MMeAssocReq) format is shown in table 1.

TABLE 1

The network access of the STA is to notify the CCO by sending the association request message, and the CCO knows the network access request of the STA according to the association request message and performs confirmation reply.

After the STA sends the association request, it needs to wait for the CCO to process the association request message, and then an association confirmation message or an association summary indication message sent by the CCO, or an association confirmation message sent by the proxy station. And the STA judges whether the network access is successful according to the result in the message. If the association confirmation or the association summary indication message is not received, the association request can be reinitiated; if the network access request is rejected, the STA may wait for a time interval according to the reassociation time and then request network access again, or may select another network (switching NID) to request network access.

After receiving the association request message, the MAC layer of the CCO parses the mode field information in the MPDU header and then uploads the parsed mode field information to the network layer through different interfaces according to the corresponding mode information to perform corresponding information processing. The CCO first finds the MAC address in the white list according to the eighteenth byte MAC address information in the association request message. If the white list does not contain the station, the network access request of the station in the network is rejected. The CCO directly constructs the association confirmation message and indicates rejection of the network access request in the corresponding twelfth result field.

The definition of the format of the association confirmation message (MMeAssocCnf) is shown in table 2.

TABLE 2

If the site exists in the white list, the site is allowed to enter the network. And the CCO judges whether the TEI distribution condition of the current site in the local mode or another mode distributes correct TEI for the site according to the distributed condition field of the white list.

Fig. 4 shows a flow chart for determining a dual-mode state of a station, and determines whether an MAC address of the station is a first network access in the mode: if not, directly inquiring the white list, replying the same TEI of the site in another mode, and replying the association confirmation message; if yes, judging whether the network access condition is met, if so, distributing TEI to the station in sequence, replying association confirmation message, after association confirmation, recording the distributed TEI by a white list, when the same MAC address of another mode of the station requests for network access, inquiring the white list, replying the same TEI of the station under the mode, and replying the association confirmation message.

Since it is considered that there is a multi-mode network in which multiple networks coexist. The policy of the above specification TEI can be used to indicate the current network size status of the network. A larger TEI that has been currently allocated indicates a larger current network size of the network. If the conflict of the same Network Identification (NID) exists among the multiple networks, the larger the network size is, the longer the time for all the sites to re-enter the network to form a new network is, so the CCO can select whether the network needs to adjust the NID for re-networking according to the TEI size.

The inter-network coordination frame is used for contention coordination and NID coordination of inter-network time slots by CCOs, and is generally used for performing bandwidth negotiation and NID negotiation between CCOs in a scenario where multiple high-speed carrier communication networks coexist. The variable area contents of the inter-network coordination frame are shown in table 3. Duration, which is a 16-bit field, indicates the length of the slot that the network needs to apply for. Unit: 1 millisecond. Bandwidth start offset, time offset of the next bandwidth slot start time, unit: 1 millisecond, the offset time representing the time offset from the current time to the start of the next bandwidth slot when the next bandwidth slot has not started, the offset time having a value of 0 when the next bandwidth slot has started. The neighbor network number is received, the network number of the neighbor network can be received, the network can receive the signal of the network, the neighbor network number is carried when the multi-network coordination frame is sent each time, and the neighbor network which can be received by the network is informed to the peripheral neighbor network through multiple sending.

TABLE 3

The unused reserved field is changed to the TEI value assigned by the current network CCO.

After the network scale is gradually enlarged, after the edge STA gradually accesses the network, neighbor networks may exist around the STA, and the neighbor networks do not know that the neighbor networks exist before the STA accesses the network. Therefore, after the STA enters the network, there may still be a problem of NID collision, and since the NID is the same, the STA may receive the information sent by the neighbor network, and at this time, the STA needs to report the status of the neighbor network to the own network. The definition of the network conflict report message (mmnetworkcondlicreport) format is shown in table 4. After the STA recognizes that the NID repetition exists, the message is reported to the CCO, and the CCO can adjust the NID according to the conflict network information.

TABLE 4

And coordinating and carrying the maximum allocated TEI value of the neighbor network in the neighbor network entry, and uploading the value to the CCO. After the CCO analyzes the information, whether the scale of the network needs to be adjusted for NID to be networked again is judged.

Specific example 1: dual mode canonical TEI allocation

Obviously, in the technical solution of the present invention, other existing connection modes and communication protocols of the communication module in the smart grid may also be used between the concentrator and the CCO, and the present invention is not limited to this.

In this embodiment, after receiving the association request message of the STA, the CCO analyzes the following key information, and replies an association confirmation message.

Wherein the key information includes:

a) A site MAC address;

b) CCO local white list information

c) Mode information of the message;

comparing the mode information and the MAC address with the local white list information of the CCO, and giving a corresponding TEI or a network access refusing message;

specific example 2: multi-network inter-network coordination

Obviously, in the technical solution of the present invention, the concentrator and the CCO may also use existing connection modes and communication protocols of other smart grids and communication modules, and the present invention is not limited to this.

The important information of the inter-network coordination frame and the network conflict message is as follows

The key information is as follows:

a) CCO MAC address.

b) Network number NID information.

c) The maximum assigned TEI value.

The CCO makes a determination by identifying the above information whether the network needs to adjust the NID for re-networking.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (7)

1. A dual-mode fusion networking method is characterized in that: the method comprises the following steps:

s1: issuing a white list to a Central Coordinator (CCO);

s2: after a station STA receives a central beacon of a CCO (central beacon) or a discovery beacon of the STA in a broadband micropower BMP (bone marrow map) or broadband power line carrier communication (HPLC) mode, initiating an association request message according to an indication in the beacon;

s3: after receiving an association request message of a station STA, the CCO accesses the white list, allocates the same terminal equipment identification TEI for the station which is allowed to access the network in two network modes, and replies an association confirmation message;

s4: the CCO generates a site dynamic topology information record;

s5: and the CCO judges whether the network needs to adjust the NID for re-networking according to the TEI size.

2. The dual-mode converged networking method of claim 1, wherein: in step S2, when the STA accesses the network, firstly, the proxy station is selected through the receiving and evaluation of the network message, then the association request message is initiated according to the indication in the beacon, the association request is initiated under the condition that the 'association starting flag bit' of the beacon is 1, and when the station has no TEI, the corresponding source TEI in the message is filled with 0.

3. The dual-mode converged networking method of claim 1, wherein: in step S3, after the MAC layer of the CCO receives the association request message, the mode field information in the MPDU header is analyzed, and the mode field information is uploaded to the network layer by adopting different interfaces according to the corresponding mode information to perform corresponding information processing;

the CCO firstly correspondingly finds out the MAC address in the white list according to the MAC address information of the eighteenth byte in the association request message;

if the white list does not contain the site, the CCO constructs an associated confirmation message for rejecting the network access request;

if the white list contains the site, the CCO judges the TEI distribution condition of the current site in the local mode or another mode according to the distributed condition field in the white list, distributes the correct TEI for the site, and constructs a correlation confirmation message allowing the network access request.

4. The dual-mode converged networking method of claim 1, wherein: the CCO judges the station dual-mode state through the following processes:

judging whether the MAC address of the station is accessed to the network for the first time under the mode:

if not, directly inquiring the white list, replying the same TEI of the site in another mode, and replying an association confirmation message;

if yes, judging whether the network access condition is met, if so, distributing TEI to the station in sequence, replying an association confirmation message, after association confirmation, recording the distributed TEI by a white list, and if the same MAC address in another mode of the station requests network access, inquiring the white list, replying the same TEI of the station in the mode, and replying the association confirmation message.

5. The dual-mode converged networking method of claim 1, wherein: the association request message of the site and the association confirmation message of the CCO can be transmitted through the proxy site.

6. The dual-mode converged networking method of claim 1, wherein: the website judges whether the network access is successful according to a correlation confirmation message or a result in a correlation summary indication message sent by the CCO; if the association confirmation message or the association summary indication message is not received, the association request can be reinitiated; if the network access request is rejected, the station may wait for a time interval according to the reassociation time and then request network access again, or may choose to switch the NID to another network and request network access again.

7. The dual-mode converged networking method of claim 1, wherein: the step S5 specifically includes the following steps:

the CCO carries out competition coordination and NID coordination of the internetwork time slot through the internetwork coordination frame, when a site accesses the network, the state of a neighbor network is reported to the network through a network conflict report message, when the problem of NID conflict exists, the neighbor network entry is coordinated to carry the largest distributed TEI value of the neighbor network and report the TEI value to the CCO, and after the CCO analyzes the information, the CCO judges whether the network scale needs to adjust the NID for networking again.

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