CN100581133C - Wireless meshed network multicast communication method facing to industry monitoring application - Google Patents
Wireless meshed network multicast communication method facing to industry monitoring application Download PDFInfo
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Abstract
The invention discloses a wireless reticulation network multicast communication method applicable to an industrial monitoring. The invention utilizes sufficiently a device with powerful capability to assist the maintenance and management multicast of a spot device with limited resource. By adopting the multicast method based on a central control, firstly, the spot device does not require a record and maintenance to the multicast member list, so a limited storage space of the spot device can be saved; secondly, the spot device does not require a discovery and maintenance to the multicast router, thereby, a communication spending of the spot device is saved; thirdly, the maintenance and management of the multicast is carried out in the central device with powerful capacity in a concentrated way, and the invention is easy to realize and manage.
Description
Technical field
The invention belongs to the wireless communication field, specifically is method for multicast communication in wireless mesh (Mesh) network of using towards industry monitoring.
Background technology
In recent years, along with the develop rapidly of the microprocessor technology and the low-consumption wireless communication technology, the radio network technique of achieving success in commercial kitchen area begins to enter industrial control field, becomes the following new growth point of industrial automation product.Obviously, at aspects such as configuration, installation, modification and expansions, the cost of wireless network all is lower than cable network; And with respect to star-like and tree topology, the Mesh network has high reliability, enhanced scalability, bigger throughput and better network energy consumption balance.So the wireless Mesh netword technology will become a main flow communication technology that will be used for industry monitoring future.
The wireless Mesh netword structure that is used for industry monitoring as shown in Figure 1, have some new characteristics with respect to other application (using): at first as military and commercial, being used for data acquisition in the network is all kinds of field apparatuss with the node of transmitting of communicating by letter, their communication, storage capacity are very limited, and because the restriction of applied environment and cost, most node relies on powered battery, and this has determined that resource available in the network service is very limited; Secondly, the data communication characteristics that industry monitoring is used are: field apparatus sends to the stronger gateway device of data handling capacity that collects in wired backbone network of factory, user's instruction also needs to send in the field apparatus by gateway device, and this has determined the pattern relative fixed of network information transfer.
Network communication mode can be divided into three kinds: clean culture, broadcasting and multicast.Wherein, according to application demand with some node division to same group, each communication all is just to be called multicast to the mode that a group node sends message, claims multicast again, it is the communication pattern of one-to-many, promptly message only sends to the member node that belongs to multicast group.Multicast is between clean culture and the broadcasting.Multicast is extremely important concerning the application that message need be passed to a plurality of recipients, as communicating by letter or the like in network configuration, plant maintenance, the equipment group.The record of multicast member and maintenance need expend a large amount of memory spaces, multicast path by discovery and safeguard to need higher energy consumption and communication overhead, but in wireless industrial Mesh network, the storage capacity of field apparatus, communication capacity and utilisable energy are all very limited, so, how realize under the condition of strict resource constraint that cast communication is a challenge efficiently having.
At present, the multicast strategy of wireless Mesh netword all is the method for multicasting that directly adopts Internet basically, and expense is very big, is not suitable in the resource-constrained industry spot wireless network.The people is arranged in the recent period, and proposition reduces the cast communication expense by the access point that increase is exclusively used in multicast at wireless Mesh netword, but obviously it need increase extra access point, and it is unsatisfactory to improve network operation cost and effect.
The present invention proposes a kind of network multicast method of low expense specially at the constraint of field apparatus limited ability in the industry monitoring application, and target is to reduce energy consumption, storage and the communication overhead of field apparatus multicast.
Summary of the invention
At the strict limited characteristics of the wireless Mesh netword resource of using towards industry monitoring, the object of the present invention is to provide a kind of low expense, be easy to the method for multicast communication that uses and manage.
To achieve these goals, technical scheme of the present invention: a kind of wireless meshed network multicast communication method of using towards industry monitoring, it is characterized in that:, finish the storage and maintenance work of multicast by central apparatus (as gateway device) based on the center control model; All multicast messages all are at first to send to central apparatus, obtain group membership's information by central apparatus by the inquiry multicast table, then single multicast message are split into a plurality of unicast messages, send to each member in the group respectively; Detailed process comprises creates multicast group and cast communication.
The establishment of described multicast group comprises:
1) the multicast group numbering that will be created by the field apparatus of initiating multicast is inserted in the multicast group set, then multicast group request to create message is sent to gateway device by up route;
2) after gateway device was received the multicast group request to create message that is sent by field apparatus, the multicast group information in the extraction request message also was inserted in the multicast information table;
3) gateway device is by descending route, and the every other member in group except the field apparatus of initiating the multicast group request to create sends a command message that adds multicast group;
4) after other members in the multicast group receive and add multicast group command, join group # in the multicast group set and return a confirmation message to gateway device and represent whether successfully to add this multicast group;
5) if all members successfully add in the multicast group, gateway device is just created successfully by the field apparatus multicast group that descending route notice is initiated multicast;
Described cast communication comprises:
1) after multicast group was created successfully, the field apparatus that is carried out cast communication by needs sent to gateway device with multicast request message by up route earlier;
2) after gateway device is received multicast request message, extract the information in the load of request message network layer, obtain group # and multicast content;
3) gateway device is according to group #, and inquiry multicast group information table obtains group member's tabulation, then with multicast content as the network layer load, send to all members except the equipment of initiating multicast request in the group respectively by descending route unicast mode;
The source address of described unicast message will be appointed as the device address of initiating multicast request, but not the gateway device address; Destination address is each group member device address; Wherein multicast request message comprises network layer header and network layer load two parts, adds frame type (this is a multicast request message for a mark) and multicast load (comprising purpose group # and multicast content) in the network layer load; Wherein multicast group request to create message format definition: comprise network layer header and network layer load two parts, add frame type (this is a multicast group request to create message for a mark) and multicast group information (comprising group # and group member's address list) in the network layer load; Wherein every multicast group information comprises in the multicast information table: group # and group member's list of device addresses.
Advantage of the present invention:
The multicast strategy that proposes among the present invention under the prerequisite that takes into full account the industry monitoring application characteristic, utilizes the stronger central apparatus of ability (as gateway device) to assist resource-constrained field apparatus to carry out the maintenance and management of multicast; Can be implemented in and reduce network operation cost and purpose satisfactory for result under the situation that does not need to increase extra access point.The method of multicasting that provides among the present invention is provided, and at first, field apparatus need not record and safeguards the multicast member tabulation, so can save the field apparatus finite storage space; Secondly, thus field apparatus does not need to carry out the communication overhead that field apparatus has been saved in multicast route discovery and maintenance; Once more, the maintenance and management of multicast carries out on the stronger central apparatus of ability in a concentrated manner, is easy to realize and management.
Description of drawings
Fig. 1 is an industry monitoring wireless Mesh netword structure chart.
Embodiment
The present invention is described in more detail below in conjunction with accompanying drawing.
Concrete enforcement is divided into following two steps:
1. the establishment of multicast group:
Multicast group is the subclass of field apparatus in the network, and each field apparatus safeguards that all an own affiliated multicast group set (as table 1, comprises the multicast group numbering; Can be sky, represent that this equipment does not belong to any multicast group) be used for writing down the cast communication of present participation; Gateway device after startup, create a multicast information table (form such as table 3) manage concentratedly with maintaining network in all multicast group information; Field apparatus at first needs to create multicast group before starting cast communication, concrete steps are as follows:
1) in the multicast group numbering insertion multicast group set that the field apparatus of initiation multicast will be created, then multicast group request to create message (form such as table 2) is sent to gateway device by up route;
2) after gateway device was received the multicast group request to create message that is sent by field apparatus, the multicast group information in the extraction request message also was inserted in the multicast information table (form such as table 3), and every multicast group information comprises:
A) group #;
B) group member's list of device addresses;
3) gateway device is by descending route, and the every other member in group except the field apparatus of initiating the multicast group request to create sends a command message that adds multicast group;
4) after other members in the multicast group receive and add multicast group command, join group # in the multicast group set and return a confirmation message to gateway device and represent whether successfully to add this multicast group;
5) if all members successfully add in the multicast group, gateway device is just created successfully by the field apparatus multicast group that descending route notice is initiated multicast;
Wherein multicast group request to create message format is defined as follows (specifically referring to table 2): comprise network layer header and network layer load two parts, add frame type (this is a multicast group request to create message for a mark) and multicast group information (comprising group # and group member's address list) in the network layer load.
Multicast group set under table 1 equipment
| Multicast group under the equipment |
| The numbering of affiliated multicast group 1 |
| The numbering of affiliated multicast group 2 |
| ... |
Table 2 multicast group request to create message format
Table 3 multicast group information sheet format
2. cast communication:
1) after multicast group was created successfully, the field apparatus that need carry out cast communication sent to gateway device with multicast request message (form such as table 4) by up route earlier;
2) after gateway device is received multicast request message, extract the information in the load of request message network layer, obtain group # and multicast content;
3) gateway device is according to group #, and inquiry multicast group information table obtains group member's tabulation, then with multicast content as the network layer load, send to all members except the equipment of initiating multicast request in the group respectively by descending route unicast mode.Attention: the source address of all these unicast messages will be appointed as the device address of initiating multicast request, but not the gateway device address; Destination address is each group member device address.
Wherein the multicast request message formal definition is as follows: (specifically referring to table 4) comprises network layer header and network layer load two parts, adds frame type (this is a multicast request message for a mark) and multicast load (comprising purpose group # and multicast content) in the network layer load.
Table 4 multicast request message form
Operation principle of the present invention:
1. the structure of multicast group and maintenance: each group membership only need write down the group # at own place, does not write down other member in the group, does not also record these group memberships' routing iinformation, and maintenance work is put into gateway device and does.Gateway device is safeguarded a multicast information table, comprises group # and group membership tabulation.When certain field apparatus will be created a multicast group, at first the information that will be organized by initiating equipment sends to gateway device, gateway device adds new group information in the multicast information table to, utilizes descending route to notify all members in this group to join in this group then.
2. method of multicasting: when certain field apparatus will send multicast message, at first this multicast message is sent to gateway device, the routing iinformation that gateway device inquiry multicast table obtains group membership's tabulation and arrives these group memberships, the unicast message that a multicast message is split into each group membership sends to these group memberships then.
For this method for multicast communication is described more explicitly, please see following Example:
1. the establishment of multicast group
Equipment 1 will be created multicast group 1, and the group membership is: (1,2,4), and its foundation step is as follows:
1) equipment 1 inserts own affiliated multicast group set (as shown in table 5) with multicast group 1, then multicast group request to create message (as shown in table 6) is sent to gateway device by up route;
Multicast group set under table 5 equipment 1
| Multicast group under the equipment 1 |
| Multicast group 1 |
| The numbering of affiliated other multicast group ... |
Table 6 multicast group 1 request to create message format
2) after gateway device is received the multicast group request to create message that is sent by field apparatus, extract the multicast group information in the request message and be inserted into (as shown in table 7) in the multicast information table;
Table 7 inserts the multicast group information table after the multicast group 1
3) gateway device is by descending route, and the every other member (equipment 2 and equipment 4) in group except the field apparatus of initiating the multicast group request to create sends a command message that adds multicast group 1;
4) after other members (equipment 2 and equipment 4) in the multicast group receive the order that adds multicast group 1, multicast group 1 is joined in the multicast group set under it (as table 8, shown in 9) and return a confirmation message to gateway device and represent whether successfully to add this multicast group;
Multicast group set under table 8 equipment 2
| Multicast group under the equipment 2 |
| Multicast group 1 |
| The numbering of affiliated other multicast group ... |
Multicast group set under table 9 equipment 4
| Multicast group under the equipment 4 |
| Multicast group 1 |
| The numbering of affiliated other multicast group ... |
5) if all members (equipment 2 and equipment 4) successfully add in the multicast group, gateway device is just created successfully by descending route announcement apparatus 1 multicast group 1;
In like manner, equipment 5 can be created multicast group 2, and the group membership is: (2,3,5), create successfully after, the multicast group set under the equipment 2,3,5 and the multicast group information table of gateway device are shown in table 10,11,12,13:
Multicast group set under table 10 equipment 2
| Multicast group under the equipment 2 |
| Multicast group 1 |
| Multicast group 2 |
| The numbering of affiliated other multicast group ... |
Multicast group set under table 11 equipment 3
| Multicast group under the equipment 3 |
| Multicast group 2 |
| The numbering of affiliated other multicast group ... |
Multicast group set under table 12 equipment 5
| Multicast group under the equipment 5 |
| Multicast group 2 |
| The numbering of affiliated other multicast group ... |
Table 13 inserts the multicast group information table after the multicast group 2
2. cast communication
After multicast group is created successfully, just can carry out cast communication.For example, equipment 2 will send message to multicast group 1: " how do you do for the friends of multicast group 2, I be equipment 2! ", step is as follows:
1) equipment sends to gateway device with multicast request message (as table 14) by up route earlier;
Table 14 multicast request message
2) after gateway device is received multicast request message, extract the information in the load of request message network layer, obtain group # and multicast content;
3) gateway device is according to group #, inquiry multicast group information table (as table 13) obtains group member's tabulation and is (1,2,4), then with multicast content as the network layer load, send to all members (equipment 1,4) except the equipment of initiating multicast request in the group respectively by descending route unicast mode, as table 15,16.
Table 15 sends to the message of equipment 1
Table 16 sends to the message of equipment 4
To sum up, the present invention is under the prerequisite of considering the industry monitoring application characteristic, and the equipment that the ability that makes full use of is stronger is assisted resource-constrained field device maintenance and managing multicast.After adopting this method of multicasting based on center control, at first, field apparatus need not record and safeguards the multicast member tabulation, so can save the field apparatus finite storage space; Secondly, thus field apparatus does not need to carry out the communication overhead that field apparatus has been saved in multicast route discovery and maintenance; Once more, the maintenance and management of multicast carries out on the stronger central apparatus of ability in a concentrated manner, is easy to realize and management.
Claims (5)
1. a wireless meshed network multicast communication method of using towards industry monitoring is characterized in that: based on the center control model, finished the storage and maintenance work of multicast by central apparatus; All multicast messages all are at first to send to central apparatus, obtain group membership's information by central apparatus by inquiry multicast information table, then single multicast message are split into a plurality of unicast messages, send to each member in the group respectively; Detailed process comprises creates multicast group and cast communication;
The establishment of described multicast group comprises:
1) the multicast group numbering that will be created by the field apparatus of initiating multicast is inserted in the multicast group set, then multicast group request to create message is sent to gateway device by up route;
2) after gateway device was received the multicast group request to create message that is sent by field apparatus, the multicast group information in the extraction request message also was inserted in the multicast information table;
3) gateway device is by descending route, and the every other member in group except the field apparatus of initiating the multicast group request to create sends a command message that adds multicast group;
4) after other members in the multicast group receive and add multicast group command, join group # in the multicast group set and return a confirmation message to gateway device and represent whether successfully to add this multicast group;
5) if all members successfully add in the multicast group, gateway device is just created successfully by the field apparatus multicast group that descending route notice is initiated multicast;
Described cast communication comprises:
1) after multicast group was created successfully, the field apparatus that is carried out cast communication by needs sent to gateway device with multicast request message by up route earlier;
2) after gateway device is received multicast request message, extract the information in the load of request message network layer, obtain group # and multicast content;
3) gateway device is according to group #, and inquiry multicast group information table obtains group member's tabulation, then with multicast content as the network layer load, send to all members except the equipment of initiating multicast request in the group respectively by descending route unicast mode.
2. according to the described wireless meshed network multicast communication method of using towards industry monitoring of claim 1, it is characterized in that: the source address of described unicast message will be appointed as the device address of initiating multicast request, but not the gateway device address; Destination address is each group member device address.
3. according to the described wireless meshed network multicast communication method of using towards industry monitoring of claim 1, it is characterized in that: wherein multicast request message comprises network layer header and network layer load two parts, adds frame type and multicast load in the network layer load.
4. according to the described wireless meshed network multicast communication method of using towards industry monitoring of claim 1, it is characterized in that: wherein multicast group request to create message format definition: comprise network layer header and network layer load two parts, add frame type and multicast group information in the network layer load.
5. according to the described wireless meshed network multicast communication method of using towards industry monitoring of claim 1, it is characterized in that: wherein every multicast group information comprises in the multicast information table: group # and group member's list of device addresses.
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| CN101621747B (en) * | 2009-08-12 | 2012-07-11 | 广州海格通信集团股份有限公司 | Reliable multicast transmission method of wireless mesh network |
| CN102026098A (en) * | 2009-09-16 | 2011-04-20 | 索尼株式会社 | Communication network as well as routing method and device thereof |
| CN101827314B (en) * | 2009-12-29 | 2012-10-17 | 中国科学院声学研究所 | Method for realizing L2 layer multicast based on dynamic multicast list |
| JP6387802B2 (en) * | 2014-11-17 | 2018-09-12 | ソニー株式会社 | Information processing apparatus, information processing method, and program |
| CN108055151B (en) * | 2017-12-11 | 2021-03-02 | 日立楼宇技术（广州）有限公司 | Port management method and device of network node, network node and storage medium |
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| CN1747446A (en) * | 2005-10-21 | 2006-03-15 | 清华大学 | Application layer group broadcasting method with integrated type and distributed type combination |
| WO2006074022A2 (en) * | 2005-01-05 | 2006-07-13 | Meshnetworks, Inc. | A multicast architecture for wireless mesh networks |
| WO2006115487A1 (en) * | 2005-04-25 | 2006-11-02 | Thomson Licensing | Routing protocol for multicast in a meshed network |
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| WO2006074022A2 (en) * | 2005-01-05 | 2006-07-13 | Meshnetworks, Inc. | A multicast architecture for wireless mesh networks |
| WO2006115487A1 (en) * | 2005-04-25 | 2006-11-02 | Thomson Licensing | Routing protocol for multicast in a meshed network |
| CN1747446A (en) * | 2005-10-21 | 2006-03-15 | 清华大学 | Application layer group broadcasting method with integrated type and distributed type combination |
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