CN101325545B - Method for designing redundancy route in industry wireless communication network - Google Patents
Method for designing redundancy route in industry wireless communication network Download PDFInfo
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- CN101325545B CN101325545B CN2008100700041A CN200810070004A CN101325545B CN 101325545 B CN101325545 B CN 101325545B CN 2008100700041 A CN2008100700041 A CN 2008100700041A CN 200810070004 A CN200810070004 A CN 200810070004A CN 101325545 B CN101325545 B CN 101325545B
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Abstract
The invention relates to a method for establishing redundant route in industry wireless communication network. In industry wireless communication, the network for connecting skeleton routing devices and field devices generally adopts a tree type topology, if a certain routing device goes wrong or the chain circuit communicated to a certain routing device is disturbed, all devices below the device cannot transmit data and lose utility. The resolving scheme is that each field device is configured with a standby father device simultaneously upon accessing network. When the network is normalized, all devices adopts a tree type routing to communicate; when a certain routing device goes wrong or the chain circuit communicated to a certain routing device is disturbed, the lower layer devices of the device automatically establish a redundant route to perform ascending and descending data transmission, and guarantees the reliability of the entire network communication. Simultaneously when the routing device is recovered or the disturbance clears away, the lower layer device can cancel the redundant route, recover to the normal communication state, thereby the entire network is provided with a favorable redundant self-cure capability.
Description
Technical field
The present invention relates to wireless communication technology, specifically is the method for designing of redundant path in a kind of industry wireless communication network.
Background technology
Fast development along with wireless communication technology, various new technologies are applied to industry spot gradually, the introducing of wireless communication technology has solved problems such as industry spot difficult wiring, installation and maintenance cost height, but existing cordless communication network can't adapt to complicated industry spot environment.Research to redundancy scheme in the wireless communication technology mostly concentrates on the data redundancy aspect now, and ISA-SP100 and wireless HART are as two kinds of main standard in the International Industry wireless communication field, primary study all is the Mesh topological structure that possesses the relevant redundancy function in the standard that they are issued, and does not relate to the communication redundancy problem in the tree network.For example at document [WirelessHART Communication Standard, HART 7.0Specifications, The HART
Communication Foundaion (HCF), September 7,2007] in the up-to-date standard of the wireless HART that Hart Comm Foundation issued, gateway is implemented centralized management to all devices, Mesh mechanism is unified to be to realize redundancy feature at least two paths that communicate with gateway of each field device configurations and system administration manager uses.But the system management of this full Mesh topological structure and safety management are very complicated, and the communication scheduling of Mesh the whole network is a difficult problem especially, therefore still are in the standard stage, really do not use.
In commercial Application, consider particular problems such as on the basis of convenient management, to realize communication scheduling, so backbone network adopts the two-tier network topological structure usually with the communication subnet that is operated in each site environment.Adopt the Mesh topology by the formed backbone network of gateway and key routing device, realize the redundancy of communication path, guarantee the timely reliability of transfer of data by Mesh mechanism.And the Star network that the second layer communication subnet that uses in the industry spot environment before is made up of key routing device and terminal equipment, characteristics are convenient managements, key route only needs the adding and the disconnection of management terminal device, need not consider the redundancy issue of communication path in the subnet.But the extension of network of this hub-and-spoke configuration is not strong, can't satisfy the demand of complicated day by day site environment, therefore adopts the two-tier network topological structure of Mesh+Tree in the commercial Application of present stage usually.
By a key routing device and the some terminal equipment with acquisition function of site environment and communication subnets that routing device is formed second layer tree topology of being operated in, networking flexibility is convenient, and can come extended network by increasing the degree of depth.But the tree network in the wireless communication technology just to as the key routing configuration of network core redundance unit, but never realize the function of communication redundancy, can't provide redundant path for the field apparatus of working in the network, make and the poor anti jamming capability of network can not guarantee the reliability of communicating by letter.And because industry wireless network is applied to the comparatively abominable place of environment through regular meeting; particularly as the collecting device of terminal; the place that the personnel that are usually operated at do not go over a long time; if therefore certain on-the-spot routing device is interfered or breaks down in the tree network; then all subsets of its lower floor all can't transceive data, influences industrial production.The present invention proposes under this background, mainly is by mechanical floor at the scene the communication reliability problem that redundant path solves tree type industry wireless network to be set.
Summary of the invention
The present invention is directed to the tree network poor anti jamming capability that is applied in the industry spot environment, can't guarantee the problem of communication reliability, proposed a kind ofly can improve the antijamming capability of network, thereby guaranteed communication reliability for field apparatus in the network provides the method for redundant path.
The technical solution adopted in the present invention is: designed the implementation method of redundant path in a kind of industrial wireless communication tree network, this method comprises the steps:
Select the maximum routing device of link-quality indication LQI value as parent device when (1) each field apparatus (comprising on-the-spot routing device and on-site terminal equipment) networks in the network in Mac layer-management information bank, the routing device that selection LQI value is taken second place is as standby parent device;
(2) in the network layer information storehouse of equipment the communication failure frequency threshold value is set at the scene, if field apparatus reaches the communication failure frequency threshold value to the number of times that its parent device sends data failure continuously, then this field apparatus sends the redundant path that comprises self address and depth information from the standby parent device of trend and sets up frame, and the value of specific identifier position Sign is set;
(3) standby parent device is after receiving that redundant path is set up frame, by the content of standby list item StandbyTbl in parse for frame topology update self the network layer information storehouse, duplicate the load of setting up frame then and send redundant path as source address to father's routing device and set up frame with oneself;
(4) each receives that redundant path sets up the routing device of frame after having upgraded the StandbyTbl list item of self, father's routing device that frame is transmitted to own last layer will be set up, set up frame like this and just successively be uploaded to key routing device, set up redundant path from field apparatus to key route.
The content of described StandbyTbl list item comprises: redundant path is set up in the frame payload address and the depth information of the field apparatus that can't communicate with parent device, used next hop address parameter when using redundant path to send information downwards.Described specific identifier position Sign is defined as two bytes, the residing communications status of sign field apparatus, low byte is the parent device operate as normal of 1 expression field apparatus, be that 0 expression field apparatus can't communicate with parent device, and field apparatus transmission redundant path is changed to 1 with high byte after setting up frame, sends after redundant path is cancelled frame high byte to be changed to 0.
In case after redundant path was set up, field apparatus not only can send the data that collect to the upper strata by standby parent device, key routing device also can be by redundant path to field apparatus transfer management information.And after field apparatus detects communication recovery with parent device, can send redundant path cancellation frame to standby parent device voluntarily, cancellation whole piece redundant path makes network be returned to normal communications status.Redundancy feature among the present invention is that field apparatus is realized voluntarily by the network layer command frame when needed, and being different from the Mesh topology by the system management unification is the implementation that equipment disposition needs the redundant path safeguarded constantly well.
By the present invention, can under guaranteeing the situation of real-time communication, make the communication path of scene equipment level in the industry wireless network possess the function of redundant self-healing, strengthened the communication reliability of whole network.
Description of drawings
Fig. 1 basic principle schematic of the present invention
Fig. 2 has the tree network topological structure schematic diagram of redundant path
Fig. 3 field apparatus of the present invention is to the flow chart of upper strata equipment sending data
The key routing device of Fig. 4 the present invention sends the flow chart of information to lower floor's equipment
Set up and use the network diagram of redundant path among Fig. 5 the present invention
Embodiment
Figure 2 shows that the second layer tree network schematic diagram of the two-layer topological structure of Mesh+Tree in the industry wireless communication network.This network is made up of key routing device, on-the-spot routing device and on-site terminal equipment, and key routing device B is this server, is responsible for interior field apparatus of present networks and the communication between the gateway, is equipped with to be used for redundant equipment S.On-the-spot routing device R1-R7 not only has route forwarding function, also has data acquisition function, and on-site terminal equipment E1-E4 only has data acquisition function as whole network lowermost layer equipment, and on-the-spot routing device and on-site terminal equipment in the network are referred to as field apparatus.In Fig. 2, if routing device R2 can't communicate because of breaking down or being interfered, then all subsets of R2 comprise that routing device R3 and R5 and terminal equipment E1 and E2 can't carry out transfer of data with upper layer device, lose effectiveness, have a strong impact on the communication conditions of whole network.And if the field apparatus in the network has redundant path, then can't when communicate by letter, parent device R2 just can adopt redundant path to carry out transfer of data by routing device R1 and R6 respectively, thereby guarantee the communication reliability of network as equipment R3 and R5.
Fig. 1 is a basic principle schematic of the present invention, and whole process can be divided into four parts, represents four kinds of communications status respectively.The present invention is provided with relevant parameter and tabulation in the network layer information storehouse of equipment, specify as follows:
1. standby parent device list item: what store in the list item is the address information of standby parent device, the number of list item is represented the number of the standby parent device that each field apparatus can have, can a standby parent device only be set in embodiments of the present invention describe according to the structure and the flexible in size setting of network.
2.Sign sign position: two bytes, represent that by being provided with of this sign position being represented the residing communications status of field apparatus, low byte whether normal field apparatus communicate by letter with parent device, high byte represents that field apparatus transmission redundant path sets up frame and still cancel frame.For example, be initialized as 0x01.Low byte is set to represent the parent device operate as normal of field apparatus at 1 o'clock, is to represent that field apparatus can't communicate with parent device at 0 o'clock.Field apparatus is changed to 1 with high byte after redundant path is set up frame having sent, and high byte is changed to 0 after sending redundant path cancellation frame, also can be provided with conversely.
3. communication failure frequency threshold value: when field apparatus by network layer when parent device sends the continuous frequency of failure of data and reaches communication failure frequency threshold value set in self network layer information storehouse, just think and to communicate with parent device, need to use redundant path, concrete communication failure frequency threshold value can be provided with flexibly according to applied environment.
4.StandbyTbl list item: the redundant path received of storage is set up in the frame payload address and the depth information of the field apparatus that can't communicate with parent device, and used next hop address parameter when the use redundant path sends information downwards after oneself sending the device address set up frame and being set to also is stored in this list item.The list item number can be provided with flexibly, and the device address parameter during initialization in the list item is set to broadcast address 0xFFFF, represents that this equipment do not receive that redundant path set up frame.After receiving redundant path cancellation frame, also be that the device address parameter in the list item is made as broadcast address again, expression does not re-use this list item.
In the tree network that key routing device forms, on-the-spot routing device and on-site terminal equipment add network one by one by the request of networking, and by separately parent device distribution network short address.In the process that adds network, the radiofrequency signal that field apparatus is sent out according to the routing device that its request of networking is responded, the LQI value is provided or draws the LQI value by bottom chip by computed in software, the link-quality that obtains communicating with this routing device is indicated, the LQI value is big more, show that communication quality is good more, field apparatus will send the address of each routing device of response and corresponding LQI value is kept in the MAC layer information bank of oneself then.Field apparatus filters out the maximum routing device of LQI value as parent device from MAC layer information bank, its address information is stored in the neighbor table of oneself, and finishes the network adding by parent device distribution network address.Simultaneously the routing device that takes second place of field apparatus LQI value is set to standby parent device, and its address information is kept in the standby parent device list item in the network layer information storehouse.Afterwards along with the continuous expansion of network, each equipment in the network is all constantly intercepted the address information that various types of frames that distinct device sends in the own communication range (beacon frame, Frame, command frame) upgrade institute's memory device in the neighbor table by the MAC layer, that is to say that the neighbor table of equipment has comprised the address information of all devices within its communication capacity scope.
In the time of whole network operate as normal, shown in Fig. 1 (A), field apparatus carries out data communication by parent device and middle routing device and key route, employing be tree type route.If but the parent device of certain field apparatus breaks down or is interfered in the network, then this field apparatus just can't transmit data by parent device, and communication link disconnects, shown in Fig. 1 (B).And when this field apparatus when number of times that parent device sends failure has continuously reached communication failure frequency threshold value set in self network layer information storehouse, just think and can't communicate with parent device.Field apparatus will take out the address information of standby parent device selected when networking automatically from standby parent device list item, send redundant path to standby parent device and set up frame.It is to construct with the form of command frame in the network layer of equipment that redundant route is set up frame, set up the address and the depth information of this field apparatus of storage in the load of frame, and the flag bit information that also has a byte in the load is used to distinguish redundant path and sets up frame and cancellation frame, still cancel frame because no matter set up frame, what store in its load all is the address and the depth information of the field apparatus that can't communicate with parent device, flag bit in the command frame is set to represent it is that redundant path is set up frame at 1 o'clock, and is set to represent it is redundant path cancellation frame at 0 o'clock.Field apparatus is changed to 0 with the low byte of the sign of the Sign in self network layer information storehouse position after frame is set up in transmission, high byte is changed to 1, and expression can't be communicated by letter with parent device, and has sent redundant path to standby parent device and set up frame.
Standby parent device is after receiving that redundant path is set up frame, the address and the depth information of the field apparatus of storing in the frame payload set up in taking-up, and be kept in the StandbyTbl list item in the own network layer information storehouse in the corresponding equipment address and depth parameter, and the next hop address parameter in the list item is set to the address that oneself sends the field apparatus set up frame, and then transmits this to the parent device of oneself and set up frame.After father's routing device of standby parent device is received and is set up frame, also be to upgrade related content in the StandbyTbl list item in self network layer information storehouse by the parse for frame structure, next hop address parameter in the list item is set to send to oneself the address of the standby parent device of setting up frame simultaneously, and then sets up frame to father's routing device forwarding of own last layer.That is to say, set up frame by after can't sending with the field apparatus that parent device communicates, successively upload, the key routing device of final arrival, key route is receiving after setting up frame it also is in the StandbyTbl list item that the address of this field apparatus and depth information is kept in the own network layer information storehouse, next hop address in the list item is set to send to oneself the address of the routing device of setting up frame simultaneously, so just set up redundant path, as shown in Fig. 1 (C) from field apparatus to key route.
Simultaneously in Fig. 1 (C), after redundant path is set up, when field apparatus oneself upwards sends image data or upwards transmits data for the equipment of lower floor, can be at first be 0 to judge parent device and can't communicate by letter according to the Sign sign position in self network layer information storehouse, need to use redundant up path, directly send the data to standby parent device, and then finish transfer of data by original tree type route by standby parent device.The flow process that each field apparatus sends data to the upper strata in the network of the present invention as shown in Figure 3.
And the flow process that key routing device sends management information to lower floor equipment as shown in Figure 4, at first check the StandbyTbl list item in self network layer information storehouse, if the device address parameter in the list item is a broadcast address, then expression did not receive and set up frame, do not have equipment to break down in the network, so just send management information to lower floor's target device according to tree type route.If the device address parameter is the address information of certain field apparatus in the network in the StandbyTbl list item, represent that this field apparatus can't communicate with its parent device, set up the redundant path that arrives key route, then at first utilize the device address of storing in the StandbyTbl list item and depth information to go out the address realm of all subsets of lower floor of this field apparatus, do further judgement according to the address of the target device that will send information then according to tree type address assignment algorithm computation.If target device is not field apparatus in the StandbyTbl list item or certain equipment of its lower floor, key routing device uses tree type route to carry out normal information and sends.If the target device of institute's photos and sending messages is field apparatus in the StandbyTbl list item or certain equipment of its lower floor, then need use redundant downlink path to send management information, the transmission address that key route is arranged to the Mac layer with the next hop address parameter in self StandbyTbl list item is finished one and is jumped and send, represented as the redundant downlink path among Fig. 1 (C) like this, just can hop-by-hop information be sent to field apparatus by the next hop address in the StandbyTbl list item of each routing device on the redundant path, if the target device of institute's photos and sending messages is certain lower floor's equipment of this field apparatus, then field apparatus is sent to final objective equipment by tree type route with information again.
The information that equipment in the network is intercepted the various frames that the distinct device in the communication range sends (no matter the type of frame and destination address of transmission) by the Mac layer is brought in constant renewal in the neighbor table of self, if it is the frame of own parent device that this field apparatus has listened to any Mac layer source address at the Mac layer, just think and to communicate with parent device, just the low byte with Sign sign position is changed to 1, illustrates that parent device can operate as normal.And the network layer of field apparatus is when each transmission or forwarding data, at first check the Sign sign position in the network layer information storehouse, the sign position low byte of this moment is 1, high byte also is 1, illustrate to send and set up frame, using redundant path, but parent device has recovered normal this moment, this moment, field apparatus will send redundant path cancellation frame from the standby parent device of trend so, and the high byte of Sign sign position is changed to 0.Shown in Fig. 1 (D), redundant path cancellation frame is with to set up frame the same, also be successively to be uploaded to key routing device from field apparatus, the routing device that the cancellation frame is received in the centre all can find corresponding StandbyTbl list item according to the field device address of cancellation in the frame payload in self network layer information storehouse, device address parameter in the list item is set to broadcast address, has so just cancelled the whole piece redundant path.
After the cancellation redundant path, need at first judge Sign sign position in network layer when the upper strata sends data when field apparatus, low byte is 1 explanation parent device operate as normal, just finishes data according to tree type route and sends.And key routing device is when lower floor sends management information, at first check the StandbyTbl list item in self network layer information storehouse, the device address parameter of the inside is broadcast address and illustrates that the communications status of whole network is normal, also is to send information according to tree type route to target device.Whole network is returned to normal communication conditions.
Below in conjunction with specific embodiment, and, enforcement of the present invention is further described with reference to accompanying drawing.
Consider the applied environment of industry spot, mostly require wireless device to have characteristics such as energy consumption is little, time delay is short, network capacity is big, so the embodiment of the invention adopts the network that is built into common tree topology shown in Figure 5 by the wireless radio-frequency communication module of a plurality of conditions up to specification.The communication protocol stack bottom that wireless device uses in the network is based on the improvement version of IEEE802.15.4, network layer has the distributed address distribution function, can form tree network and go forward side by side walking along the street by communication, added the code that can realize function of the present invention simultaneously, data send and the setting of correlation function and application layer is mainly carried out.Use embedded development platform that communication module is set to different device types, according to commercial Application module is divided into: key routing device, on-the-spot routing device and terminal routing device, common radio frequency external antenna is installed on the equipment, be operated on the general frequency range of 2.4GHz 100 meters of communication ranges.
As shown in Figure 5, on-the-spot routing device R5 chooses the maximum routing device R2 of LQI value as parent device when networking, choose routing device R3 that the LQI value takes second place simultaneously as standby parent device, and the address of R3 is stored in the standby parent device list item in the network layer information storehouse.
In the time of the network operate as normal, on-the-spot routing device R5 and R6 and on-site terminal equipment E1 communicate by parent device R2 and intermediate equipment R1 and key routing device.In embodiments of the present invention, at first carry out the test of equipment fault.Setting in advance the communication failure frequency threshold value in the network layer information storehouse of all field apparatuss is 3, and the back implements to disturb to route equipment R2, and it can not be communicated with other equipment in the network.So when equipment R5 when parent device R2 sends data owing to can't receive the acknowledgement frame that R2 returns, so just think to send failure once, after continuous failure three times, just think and can't communicate with parent device.
At this moment, routing device R5 just takes out the address information of standby parent device R3 automatically from standby parent device list item, and send redundant path to R3 and set up frame, set up the address and the depth information that comprise R5 self in the frame, R5 is changed to 0 with the low byte of the specific identifier position Sign in self network layer information storehouse then, high byte is changed to 1, and expression can't communicate with parent device R2, and has sent redundant path to standby parent device R3 and set up frame.
Redundant path is set up frame and is successively uploaded to key routing device B place by routing device R3 and R1, as shown in Figure 5, receive that the routing device of setting up frame all is stored in the address of equipment R5 and depth information in separately the StandbyTbl list item by parse for frame load, simultaneously the next hop address in the StandbyTbl list item is set to respectively send the equipment of setting up frame, has so just set up a redundant path from field apparatus R5 to key route B to oneself.
After redundant path is set up, when sub-routing device R6 or the sub-terminal equipment E1 of routing device R5 pass to R5 to upper strata transmission data, perhaps R5 oneself is when the upper strata sends data, R5 at first judges the sign of the Sign in self network layer information storehouse position, if Sign sign position is 0, then expression can't communicate with parent device R2 this moment, and R5 will send the data to standby parent device R3, and R3 uses normal tree type route to carry out transfer of data after receiving data.
When key route B when lower floor equipment sends management information, whether the target device of at first checking transmission information is the device address R5 that stores in the StandbyTbl list item in self network layer information storehouse or the equipment R6 of lower floor, the E1 of R5.If, key route B then need use redundant path to send management information to equipment R5, key route B is set to Mac to the next hop address parameters R 1 in the StandbyTbl list item corresponding in the network layer information storehouse earlier and sends the address, send information to equipment R1, and R1 also sends this information to by same step the standby parent device R3 of R5, R3 sends equipment R5 again to then, and the routing device on the redundant path is finished the transmission of management information from key route B to equipment R5 by using in the network layer information storehouse separately the next hop address parameter in the corresponding StandbyTbl list item with coming hop-by-hop like this.If the target device of management information is equipment R6 of lower floor or the E1 of R5, then equipment R5 sends information to target device by tree type route again.
The redundant path that passes through according to above-mentioned employing is finished test up, downlink communication link transmission situation, our field apparatus R5 uses redundant path to communicate not influence other equipment (the routing device R6 of lower floor and the terminal equipment E1 that comprise R5) in tree network as can be seen the proper communication and the overall communication performance of network.
Next carries out the self-healing function test of network, stop interference to R2, the parent device R2 that uses the routing device R5 of redundant path is recovered normal, then listen to after any Mac layer source address be the frame of R2 at the Mac layer as equipment R5, just the low byte with the sign of the Sign in self network layer information storehouse position is changed to 1, shows that parent device can operate as normal.Then work as equipment R5 and run to network layer, at first Sign sign position is judged, its low byte and high byte are 1, illustrate and use redundant path, and it is normal that parent device has recovered, will at first send redundant path cancellation frame to standby parent device R3, the high byte with Sign sign position is changed to 0 then, and expression has sent redundant path cancellation frame.
Redundant path cancellation frame also is that slave unit R5 successively is uploaded to key routing device B with setting up frame the same, receive cancellation routing device R3, R1 of frame and key route B all separately in the network layer information storehouse device address parameter in the corresponding StandbyTbl list item be set to broadcast address, cancel the whole piece redundant path.
When equipment R5 upwards sent data afterwards, at first the low byte by self Sign sign position was 1 to judge the parent device operate as normal, just finishes the data transmission according to original tree type route then.And key routing device B is when lower floor's equipment sends management information, also be that to be by the device address parameter in self StandbyTbl list item that broadcast address is judged the network service state normal, according to tree type route management information is sent to target device then, whole network is returned to normal communication conditions.
In embodiments of the present invention, not only tested above-mentioned equipment fault, and tested link failure, promptly between equipment R2 and R5, place barrier or jamming equipment, only make the communication link between equipment R2 and the R5 occur opening circuit, and concrete redundancy reply situation except key routing device B and equipment R1 lead to the down link of R2 normal, each equipment of miscellaneous equipment and R2 lower floor communicates and still adopts redundant path, after link failure was eliminated, network was also replied normal thereupon.In a word, all adopt the network and the topological structure of tree type routing mechanism to utilize the present invention can realize the function of redundant self-healing, possess good antijamming capability in the industry spot environment, have guaranteed the communication reliability of whole network.
Claims (3)
1. set up the method for redundant path in the industry wireless communication network, it is characterized in that this method comprises the steps:
(1) in having the industry wireless communication network of tree topology, each field apparatus selects the maximum routing device of link-quality indication LQI value as parent device when networking from Mac layer-management information bank, and the routing device that selection LQI value is taken second place is as standby parent device;
(2) in the network layer information storehouse of equipment the communication failure frequency threshold value is set at the scene, if field apparatus reaches the communication failure frequency threshold value to the number of times that its parent device sends data failure continuously, this field apparatus sends the redundant path that comprises self address and depth information to standby parent device and sets up frame, and the specific identifier position Sign of the residing communications status of sign field apparatus is set in self network layer information storehouse;
(3) standby parent device is after receiving that redundant path is set up frame, upgrade StandbyTbl list item in self network layer information storehouse, the redundant path that the storage of this StandbyTbl list item is received is set up in the frame payload address and the depth information of the field apparatus that can't communicate with parent device, and used next hop address parameter when using redundant path to send information downwards; Duplicating redundant path sets up frame payload and sets up frame as source address to the last layer parent device transmission redundant path of oneself with oneself;
(4) successively upload redundant path and set up frame, set up redundant path from field apparatus to key route to key routing device.
2. method according to claim 1 is characterized in that, described specific identifier position Sign is set to two bytes, and low byte represents that whether normal field apparatus communicate by letter with parent device, and high byte represents that field apparatus sends redundant path and sets up frame and still cancel frame.
3. method according to claim 1, it is characterized in that the routing device on the redundant path uses in the network layer information storehouse separately the next hop address parameter in the corresponding StandbyTbl list item to come hop-by-hop to finish management information is routed to field apparatus from the backbone transmission.
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| CN101815287B (en) * | 2010-03-11 | 2013-05-15 | 北京交通大学 | Wireless sensor network routing method and system based on tree network |
| CN103686801B (en) * | 2012-09-11 | 2016-09-14 | 中国科学院沈阳自动化研究所 | A kind of industry wireless network loaming method based on redundancy AP |
| CN103841621B (en) * | 2014-01-16 | 2017-03-29 | 重庆邮电大学 | A kind of redundancy method for routing based on 6LoWPAN tree networks |
| CN106850665B (en) * | 2017-02-28 | 2019-03-08 | 中国南方电网有限责任公司电网技术研究中心 | Precision Time Protocol message redundancy ID of trace route path method and system |
| CN109995545B (en) * | 2017-12-29 | 2021-06-29 | 中国科学院沈阳自动化研究所 | Workshop industrial network topology construction and service scheduling method based on SDN |
| CN110995316B (en) * | 2019-11-27 | 2022-02-11 | 深圳市力合微电子股份有限公司 | Routing method for high-speed power line carrier network communication |
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| CN1747445A (en) * | 2004-09-06 | 2006-03-15 | 日立通讯技术株式会社 | Router for multicast redundant routing and method for multicast redundancy |
| CN1893338A (en) * | 2005-06-28 | 2007-01-10 | 阿尔卡特公司 | Communication path redundancy protection systems and methods |
| CN101175032A (en) * | 2007-09-26 | 2008-05-07 | 上海市信息网络有限公司 | Method for completing circuit switch-over based on the longest address matching in ATM network |
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| CN101325545A (en) | 2008-12-17 |
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