CN102014464B - Method for synchronously processing networks in wireless MESH network - Google Patents
Method for synchronously processing networks in wireless MESH network Download PDFInfo
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Abstract
The invention discloses a method for synchronously processing networks in a media access control layer of a wireless MESH network. The method mainly comprises the following steps of: performing initial network synchronization and repeat network synchronization, wherein the initial network synchronization is performed after a node is powered on, and the repeat network synchronization is performed after nodes are transformed from a synchronizing state to a desynchronizing state; and the initial network synchronization is divided into two processing modes, one is network synchronization when a new access node is initially powered on after the MESH network is built, namely a new node synchronizing process, and the other is the synchronization when a plurality of nodes are simultaneously powered on and the MESH network is not build, namely a multiple node simultaneous starting process. The method has the advantages that: by the network synchronization processing method in the media access control layer of the wireless MESH network, a synchronization processing method of the complete media access control layer in the wireless MESH network is provided, and defects that application scenes are not sufficiently supported by the conventional wireless MESH network synchronization technology when the plurality of nodes are simultaneously powered on and the like are overcome.
Description
Technical field
The present invention relates to the simultaneous techniques in a kind of Wireless MESH network, relate in particular to the Network Synchronization processing method in the Wireless MESH network media access control layer.
Background technology
Simultaneous techniques is the key technology in the Wireless MESH network, is the basis of whole system inter-node communication, has only between each node of maintenance just can make the whole system proper communication synchronously.Simultaneous techniques comprises the Network Synchronization of physical layer synchronization and media access control layer, and physical layer synchronization is the bit-level synchronization when realizing data transmit-receive, and the information that can ensure correctly receives by bit; The Network Synchronization of media access control layer is the frame synchronization of maintenance system, and by Network Synchronization, the MESH node is known the current frame number in the network, provides time reference information thereby carry out data dispatching frame by frame for scheduler module.Existing MESH network synchronization technique is primarily aimed at the Centroid networking synchronizing process of other nodes after the operate as normal in the MESH network, the Synchronous Processing scene that these class methods are not suitable for multinode when starting shooting simultaneously.
MESH network using tdd mode frame structure, in order to realize the collaborative transmission between the distributed node, on time domain, a frame can be divided into control subframe (Control Subframe) and two parts of data burst (Data Subframe).Synchronizing process is finished on the control subframe.Synchronizing process is mainly finished by send and receive network configuration message (MSH NCFG) on the control subframe; MSH_NCFG message provides synchronous information needed field of node and scheduling parameter etc.
When new node networks, according to the current operational mode of each node in the network, the processing method of Network Synchronization is also different, specifically can be divided into two kinds of processing modes: the Network Synchronization when the new network access node after a kind of MESH of being network has been set up is initially started shooting, i.e. new node synchronizing process; Another be the MESH network when multinode is started shooting simultaneously when not set up synchronously, i.e. the multinode synchronizing process of starting shooting simultaneously.
When node transferred desynchronizing state to owing to former reason synchronous regimes such as change of network environment, node was carried out the network re-entry synchronizing process.
Summary of the invention
The present invention proposes Network Synchronization processing method in a kind of Wireless MESH network.
The present invention is based on the TDD mode under the MESH network, each MESH node comprises a LTE Baseband Processing Unit and two rf boards, wherein connects a secondary N fan antenna (N＞2) and a secondary omnidirectional antenna on the rf board 1, connects a secondary N fan antenna on the rf board 2.Network synchronization technique is the key technology of MESH MAC protocol stack, is the basis that the whole network carries out proper communication, by this Network Synchronization processing method, can realize Network Synchronization, the Synchronous Processing when multinode is started shooting simultaneously when node is initially started shooting; Synchronizing function comprises that mainly the initial network of node is synchronous, network re-entry is synchronous; Wherein initial network is divided into again synchronously that new node networks synchronously and multinode is started shooting synchronously simultaneously, and initial network Synchronous Processing flow process specifically comprises:
Steps A: according to parameter configuration table configures physical layer parameter information, this information comprises: bandwidth, sampling specification (in the present invention with FFT Size sign), Cyclic Prefix sign indicating number (in the present invention with CP Size sign), frame length, frequency;
Step B: carry out the new node synchronizing process;
Step C: new node is success synchronously, goes to step G; The new node synchronization failure enters step D;
Step D: whether parameter configuration table been scanned, is then to enter step e; Otherwise go to steps A;
Step e: carry out the multinode synchronizing process of starting shooting simultaneously;
Step F: this node is chosen as Centroid, enters step G; This node is not a Centroid, goes to step B;
Step G: same EOS.
In described Wireless MESH network synchronization processing method, among the described step B, may further comprise the steps:
Step B1: start timer T1;
Step B2:T1 then before, scan 1 network configuration message of a hop neighbor node, cancellation timer T1 enters step B3; Otherwise synchronization failure enters step B7;
Step B3: start timer T2;
Step B4: T2 then before, receive 2 network configuration message of mutually same hop neighbor node, this node is put into alternative set;
Step B5:T2 then after, alternative set is not empty, enters step B6; Otherwise synchronization failure goes to step B7;
Step B6: the node that the highest grade of select time from alternative set carries out the frame calculating of the zero hour; And with the frame time started that calculates be the synchronous base time.
Step B7: the new node synchronizing process finishes.
In described Wireless MESH network synchronization processing method, in the described step e, may further comprise the steps:
Step e 1: start timer T3;
Step e 2: the network configuration message of scanning neighbor node, after receiving network configuration message, Centroid MAC Address and sender of the message's MAC Address that this locality is preserved compare, if this neighbours' MAC Address is littler than the local MAC Address of preserving, then with this neighbours' MAC Address as local Centroid MAC Address;
Step e 3: after arriving on this meshed network configuration messages transmission opportunity, if local to preserve the Centroid MAC Address be this node MAC Address, omni broadcast network configuration message then; Otherwise, be left intact;
Step e 4:T3 then after, if local Centroid MAC Address of preserving still be this node MAC Address, promptly compete the Centroid success, otherwise the competition Centroid is failed;
Step e 5: the multinode synchronizing process of starting shooting simultaneously finishes.
The network re-entry synchronizing process mainly is meant owing to moving or after reason such as change of network environment causes node to transfer desynchronizing state to by synchronous regime, the synchronizing process when node carries out the network re-entry process, and this process steps is as follows:
Step 1: scan for networks configuration messages under the configuration of original physical layer parameter;
Step 2: carry out the new node synchronizing process, success goes to step 4 synchronously; Synchronization failure enters step 3;
Step 3: carry out the initial network synchronizing process;
Step 4: the same EOS of network re-entry.
Wherein, the new node synchronizing process is identical with new node synchronizing process among the top described step B; The initial network synchronizing process is identical with top described initial network synchronizing process; The configuration of original physical layer parameter is meant the physical layer parameter that node was disposed before not having step-out.
Useful technique effect of the present invention is: the Network Synchronization processing method in the Wireless MESH network media access control layer has provided media access control layer synchronization processing method complete in Wireless MESH network, and the utilization scene when remedying existing Wireless MESH network simultaneous techniques multinode being started shooting is simultaneously supported shortcomings such as deficiency.
Description of drawings
Fig. 1 is an initial network synchronizing process schematic diagram;
Fig. 2 is a new node synchronizing process schematic diagram;
Fig. 3 is a network control frame structure schematic diagram;
Fig. 4 is the multinode synchronizing process schematic diagram of starting shooting simultaneously;
Fig. 5 is an initial network synchro timer sequential schematic diagram;
Fig. 6 is a network re-entry synchronizing process schematic diagram.
Embodiment
At the deficiencies in the prior art of describing in the background technology, the present invention proposes Network Synchronization processing method in a kind of Wireless MESH network.Specific embodiment described herein is only in order to explaining the present invention, and is not used in qualification the present invention.
Network Synchronization is handled implementation method in the Wireless MESH network of the present invention, and initial network synchronizing process when comprising the node initial network entry and node transfer network re-entry synchronizing process in the network re-entry process behind the desynchronizing state to by synchronous regime.
Referring to accompanying drawing 1, the initial network method for synchronous flow process of Wireless MESH network synchronization processing method of the present invention may further comprise the steps:
Step S1.1: according to parameter configuration table configures physical layer parameter information, this information comprises: bandwidth, FFT Size, CP Size, frame length, frequency;
Step S1.2: carry out the new node synchronizing process;
Step S1.3: new node is success synchronously, goes to step S1.7; The new node synchronization failure enters step S1.4;
Step S1.4: whether parameter configuration table been scanned, if been scanned then enters step S1.5; Otherwise, go to step S1.1;
Step S1.5: carry out the multinode synchronizing process of starting shooting simultaneously;
Step S1.6: this node is chosen as Centroid, enters step S1.7; This node is not a Centroid, goes to step S1.2;
Step S1.7: same EOS.
In the present invention, after the initial start of node, configures physical layer parameter at first, existing node exists in the default network, carry out the new node synchronizing process on configuration parameter, failure and parameter list do not have been scanned if new node networks, and change parameter and continue to carry out the new node synchronizing process.The whole been scanned of parameter list are not success synchronously still, carry out the multinode synchronizing process of starting shooting simultaneously, select Centroid by this process, if this node is chosen as Centroid, then the whole network is a reference clock with this nodal clock, at this moment, node only need send network configuration message in scheduling corresponding opportunity, so that other network access node is finished synchronously.If this node is not chosen as Centroid, illustrate there is other node in the network that this node is not only Centroid, and be a hop neighbor of this node, at this moment, node is carried out the new node synchronizing process under the current network configuration parameter, can form synchronously with this Centroid.
Referring to accompanying drawing 2, the synchronous flow process of new node in the initial network method for synchronous of Wireless MESH network synchronization processing method of the present invention may further comprise the steps:
Step S2.1: start timer T1;
Step S2.2: scan other network configuration of nodes message;
Step S23: scan other meshed network configuration messages, go to step S2.5; Otherwise, enter step S2.4;
Whether step S2.4:T1 timer expires, if do not expire, enters step S2.2; Otherwise,, enter step S2.17 if timer expires;
Step S2.5: keep this nodal information;
Step S2.6: cancellation timer T1;
Step S2.7: start timer T2;
Step S2.8: continue the scan for networks configuration messages;
Step S2.9: scan network configuration message, enter step S2.10; Otherwise, forward step S2.13 to;
Step S2.10: whether this locality has kept this nodal information, if keep, enters step S2.11; Otherwise, enter step S2.12;
Step S2.11; This nodal information is added synchronous alternative collection; Go to step S2.13;
Step S2.12: keep this nodal information; Enter step S2.13;
Whether step S2.13:T2 timer expires, if the T2 timer expires, enters step S2.14, and timer does not expire else if, goes to step S2.8;
Step S2.14: whether alternative collection is empty, if alternative collection is not empty, enters step S2.15, otherwise, go to step S2.17;
Step S2.15: from the node of the synchronous jumping figure minimum of alternative concentrated selection is datum node, a plurality of if synchronous jumping figure minimum node has, and can select the node of node number minimum or MAC Address minimum, and concrete selection can be according to the implementation flexible operating;
Step S2.16: calculate frame zero hour, and with result of calculation as frame synchronization clock;
Step S2.17: the new node synchronizing process finishes.
In said method, the computational methods of frame zero hour are:
T
next_frame＝S+(8-K)*T/8+D
Wherein, T
Next_frameBe next frame zero hour, S is the moment that new network access node receives the network configuration message of clock reference node transmission for the 2nd time, K is the transmission opportunity TO numbering that new network access node receives the network configuration message that the clock reference node sends for the 2nd time, T is the length of control subframe, and D is the length of data burst.The frame computation model zero hour sees also accompanying drawing 3.
Under new node synchronization failure and parameter list been scanned situation, we can think that node can not finish synchronous reason and have following two kinds:
(1) a plurality of nodes are started shooting simultaneously, all carry out the new node synchronizing process, do not have node to send network configuration message, cause not having in the network datum node to exist, thereby can not network;
(2) present node may be the temporary transient unique node that exists in the network, and other node may be not in running order in the network, and at this moment, node can not be finished equally synchronously.
In these cases, the multinode that the present invention the proposes method for synchronous of starting shooting simultaneously can address the above problem, and this method may further comprise the steps referring to accompanying drawing 4:
Step S4.1: start timer T3;
Step S4.2: local Centroid MAC Address is set to this node MAC Address;
Step S4.3: utilize the random back algorithm to select this node to send network configuration message opportunity;
Step S4.4: scan other meshed network configuration messages;
Step S4.5: receive other meshed network configuration messages, enter step S4.6; Otherwise, enter step S4.7;
Step S4.6: this node M AC address and local Centroid MAC Address are compared,, then replace local Centroid MAC Address of preserving with this node M AC if this node M AC preserves MAC Address less than this locality, otherwise, do not do any operation;
Whether step S4.7:T3 timer expires, the not yet due step S4.8 that enters; Otherwise, enter step S4.11;
Step S4.8: this node sends network configuration message and arrives opportunity, enters step S4.9; Otherwise, go to step S4.4;
Step S4.9: whether local Centroid MAC Address local mac address, is then to enter step S4.10; Otherwise, go to step S4.4;
Step S4.10: send the local network configuration messages; Go to step S4.4;
Step S4.11: the multinode synchronizing process of starting shooting simultaneously finishes.
After the synchronizing process of multinode starting shooting simultaneously finishes, network selecting goes out Centroid, it is the clock datum node, this Centroid is if node itself, then the node synchronizing process finishes, otherwise node need be carried out new node and go into network process under the current physical layer configuration, to set up the synchronised clock relation with Centroid.
The sequential relationship of timer T1, T2 and T3 sees also accompanying drawing 5 in the initial network synchronizing process.
After node networked synchronously, owing to wireless communications environment changes and reason such as node motion, node may transfer desynchronizing state to by synchronous regime, at this moment node need carry out the synchronous flow process of network re-entry come again synchronous so that network service recovers as early as possible.The method of recovering network service may further comprise the steps referring to accompanying drawing 6:
Step S6.1: keep the configuration of original physical layer parameter;
Step S6.2: carry out the new node synchronizing process;
Step S6.3: if synchronization failure enters step S6.4; Otherwise, go to step S6.5;
Step S6.4: carry out the initial network synchronizing process;
Step S6.5: the network re-entry synchronizing process finishes.
Wherein the original physical layer parameter is meant the physical layer configuration parameter of node before step-out; The new node synchronizing process is with process shown in Figure 2; The initial network synchronizing process is with process shown in Figure 1.
Claims (8)
1. Network Synchronization processing method in the Wireless MESH network is characterized in that, this method is carried out corresponding Network Synchronization process according to the different operation conditionss of network, comprises that initial network synchronously and the synchronous two kinds of synchronizing processes of network re-entry;
Initial network comprises new node synchronizing process and the multinode synchronizing process of starting shooting simultaneously synchronously again: the new node synchronizing process is used for when new network access node is initially started shooting to the MESH Network Synchronization of having set up; The multinode synchronizing process of starting shooting simultaneously is used for the Network Synchronization that network is not also set up one or more nodes of stylish start;
Node is at first carried out the new node synchronizing process when initial network is synchronous, if the new node synchronization failure, illustrate that then network also do not set up, and finish the Network Synchronization of node initial network entry by the multinode synchronizing process of starting shooting simultaneously this moment;
When the net node transfers desynchronizing state owing to change of network environment to by synchronous regime, carry out the network re-entry synchronizing process and realize the synchronous again of node;
Wherein initial network may further comprise the steps synchronously:
Step 101: according to parameter configuration table configures physical layer parameter information, this information comprises: bandwidth, sampling specification FFT Size, Cyclic Prefix sign indicating number CP Size, frame length, frequency;
Step 102: carry out the new node synchronizing process;
Step 103: new node is success synchronously, goes to step 107; The new node synchronization failure enters step 104;
Step 104: whether parameter configuration table been scanned, if been scanned then enters step 105; Otherwise, go to step 101;
Step 105: carry out the multinode synchronizing process of starting shooting simultaneously;
Step 106: this node is chosen as Centroid, enters step 107; This node is not a Centroid, then goes to step 102;
Step 107: the same EOS of initial network.
2. by the described method of claim 1, it is characterized in that, described configures physical layer parameter information is meant that node is according to the physical layer parameter allocation list of being made up of bandwidth, FFT Size, CP Size, frame length, frequency, reside in successively on the parameter information of corresponding list item to carry out synchronizing process, until synchronous success or parameter configuration table been scanned.
3. by the described method of claim 1, it is characterized in that described step 102 also further comprises:
Step C1: start timer T1;
Step C2: T1 then before, scan 1 network configuration message of a hop neighbor node, cancellation timer T1 enters step C3; Otherwise synchronization failure enters step C7;
Step C3: start timer T2;
Step C4: T2 then before, receive 2 network configuration message of mutually same hop neighbor node, this node is put into alternative set;
Step C5:T2 then after, alternative set is not empty, enters step C6; Otherwise synchronization failure goes to step C7;
Step C6: the node that the highest grade of select time from alternative set carries out the frame calculating of the zero hour; And with the frame time started that calculates be the synchronous base time;
Step C7: the new node synchronizing process finishes.
4. by the described method of claim 3, it is characterized in that the frame computational methods zero hour are:
T
next_frame＝S+(8-K)*T/8+D
Wherein, T
Next_frameBe next frame zero hour, S is the moment that new network access node receives the network configuration MSH_NCFG message of clock reference node transmission for the 2nd time, K is the transmission opportunity TO numbering that new network access node receives the network configuration MSH_NCFG message that the clock reference node sends for the 2nd time, T is the length of control subframe, and D is the length of data burst.
5. by the described method of claim 1, it is characterized in that described step 105 also further comprises:
Step D1: start timer T3;
Step D2: the network configuration message of scanning neighbor node, after receiving network configuration message, Centroid MAC Address and sender of the message's MAC Address that this locality is preserved compare, if this neighbours' MAC Address is littler than the local MAC Address of preserving, then with this neighbours' MAC Address as local Centroid MAC Address;
Step D3: after arriving on this meshed network configuration messages transmission opportunity, if local to preserve the Centroid MAC Address be this node MAC Address, omni broadcast network configuration message then; Otherwise, be left intact;
Step D4:T3 then after, if local Centroid MAC Address of preserving still be this node MAC Address, competition Centroid success, otherwise the competition Centroid is failed;
Step D5: the multinode synchronizing process of starting shooting simultaneously finishes.
6. by the described method of claim 5, it is characterized in that the local Centroid MAC Address initial value of preserving is a local mac address.
7. by Network Synchronization processing method in a kind of Wireless MESH network described in the claim 1, it is characterized in that wherein network re-entry may further comprise the steps synchronously:
Step e 1: scan for networks configuration messages under the configuration of original physical layer parameter;
Step e 2: carry out the new node synchronizing process, success goes to step e 4 synchronously; Synchronization failure enters step e 3;
Step e 3: carry out the initial network synchronizing process;
Step e 4: the same EOS of network re-entry.
8. by the described method of claim 7, it is characterized in that the configuration of original physical layer parameter is meant the node parameter that physical layer disposed before step-out; The new node synchronizing process is with the described method of claim 3, and the initial network synchronizing process is with the described method of claim 1.
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| CN104159288A (en) * | 2014-09-02 | 2014-11-19 | 无锡中科智联科技研发中心有限公司 | Self-healing method of WSN (Wireless Sensor Network) node based on dynamic dormancy |
| CN104244400B (en) * | 2014-09-22 | 2018-01-02 | 中国电子科技集团公司第二十研究所 | Non-cutting time benchmark Bootload based on precise synchronization self-organizing network |
| CN107371231A (en) * | 2016-05-13 | 2017-11-21 | 北京信威通信技术股份有限公司 | The synchronous method and device of wireless Mesh netword |
| CN106231652B (en) * | 2016-07-18 | 2019-05-28 | 北京交通大学 | A kind of new node method of network entry of wireless multi-hop collaborative network |
| CN107734627A (en) * | 2016-08-10 | 2018-02-23 | 北京信威通信技术股份有限公司 | A kind of network synchronization method, apparatus and system |
| CN107872872A (en) * | 2017-10-13 | 2018-04-03 | 西安电子科技大学 | A kind of networking synchronous method of Wireless MESH network |
| CN107979498B (en) * | 2018-01-03 | 2020-12-11 | 深圳市吉祥腾达科技有限公司 | Mesh network cluster and large file transmission method based on cluster |
| CN110602732B (en) * | 2019-09-25 | 2023-03-31 | 深圳市共进电子股份有限公司 | Wireless configuration parameter synchronization method, device, network equipment and computer readable storage medium |
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