CN107872872A - A kind of networking synchronous method of Wireless MESH network - Google Patents
A kind of networking synchronous method of Wireless MESH network Download PDFInfo
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- CN107872872A CN107872872A CN201710953814.0A CN201710953814A CN107872872A CN 107872872 A CN107872872 A CN 107872872A CN 201710953814 A CN201710953814 A CN 201710953814A CN 107872872 A CN107872872 A CN 107872872A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a kind of networking synchronous method of Wireless MESH network, solves the problems, such as that prior art does not search responsible node or node for network and searched in prescribed period of time less than node.Present invention specific implementation step is mainly first, to scan neighbor information table message.Secondly, network access node is scanned in listening period to whether the node in neighbor information table message is in net node, if so, then network access node initiates networking request message in net node, otherwise, selects responsible node.Finally, neighboring node list is filled, synchronous network access node and safeguards node lock in time.The network access node that the present invention designs sends time division multiple acess TDMA frame to responsible node, completes the precise synchronization of network access node and responsible node；So that to be provided with node networking synchronous method complexity low by the present invention, the advantages of realizing simple and applicable small scale network.
Description
Technical field
The invention belongs to communication technical field, further relates to a kind of Wireless MESH net in wireless communication technology field
The networking synchronous method of grid network.The present invention provides a kind of networking synchronous method of feasible wireless mesh network, ensures in nothing
The accurate time synchronized of wire grid network, realize that network access node is synchronous in the precision net of wireless mesh network, meet the section that networks
Communication requirement between point, the node for wireless mesh network networks and Time synchronization technique research provides support and auxiliary.
Background technology
Wireless Mesh netword WMN (Wireless Mesh Network) is differentiated simultaneously from point to point network (Ad hoc)
And fusion part wireless local area network technology, be increasingly becoming a kind of wide concerned Radio Access Network, it have rapid deployment, from
The characteristics of tissue, easy care.Wireless mesh topological network is a kind of network using multiple spot to multidrop topology structure,
The IEEE802.16 protocol definitions networking flow of wireless mesh topological network.
Simultaneous techniques is the key technology of wireless mesh network, is the basis of whole system inter-node communication, only keeps
Synchronization between each node can just make the proper communication of whole system.Simultaneous techniques includes the synchronization and medium access of physical layer
Control (MAC) layer Network Synchronization, physical layer synchronization is the synchronization for the bit-level for realizing data transmit-receive, it is ensured that data according to than
Spy is correctly received；The Network Synchronization of media access control layer is the frame synchronization of guarantee system, passes through Network Synchronization, node
Current frame number can be obtained, time reference information is provided so as to carry out the scheduling of data by frame for scheduler module.It is existing
Simultaneous techniques be primarily directed to responsible node and be already powered on, to provide the networking of other nodes and synchronizing process, and for
Responsible node or node are not searched in network to be not appropriate for less than the scene of node in prescribed period of time search.
Wireless mesh network uses time division duplex (TDD, Time Division Duplexing) pattern frame structure, in order to
The collaborative distributed transmission between node is realized, the present invention is improved the frame structure of standard, and in time domain, a frame includes
Control two parts of subframe and data burst.Network, synchronizing process be control subframe above complete, enter network process be by
Control and network insertion message and network configuration message completion are sent in subframe, and synchronizing process is to send net in control subframe
Network configures message to complete.
Patent document " the new node networking synchronization side of a kind of wireless multi-hop collaborative network that Beijing Jiaotong University applies at it
A kind of nothing is disclosed in method " (publication number CN106162810A, application number CN201610768501.3, applying date 2016.08.30)
The new node networking synchronous method of line multi-hop collaborative network.This method by net node periodic broadcast network configuration message,
New node carries out the network configuration message that networking scanning receives and establishes physical neighborhood list, and new node saves from multiple pre-selection patronage
A pre-selection patronage node is selected to be carried out as thick reference synchronization node in point thick synchronous；New node, which is opened to limit, receives message
Timer, new node support node after expiration of the timer, from selection one in pre-selection patronage node corresponding to message is received, and
Patronage node is subjected to essence synchronously as smart reference synchronization node.Weak point is existing for this method, and new node is needed from more
In individual pre-selection patronage node, a pre-selection patronage node is selected as thick reference synchronization nodal method is relatively complicated, screening conditions
The more efficiency of selection that have impact on reference mode.
Force builds chivalrous et al. the paper " research of Wireless Mesh network GPS simultaneous techniques " delivered at it, and (computer engineering is with setting
Count 04 phase ISSN in 2009:A kind of slotted synchronous method based on GPS second pulse is proposed in 1000-7024).Lead in this method
Gps signal is crossed as unified external clock, with reference to short-term stability (the second level of the steady in a long-term and crystal oscillator of GPS pulse
It is stable) characteristic produce accurate 10kHz synchronizing signals.Weak point is existing for this method, and node networking synchronous method is answered
Miscellaneous degree is high, and very high using gps signal cost, realizes that difficulty is larger, is not suitable for small scale network.
The content of the invention
It is an object of the invention to for above-mentioned the deficiencies in the prior art, propose that a kind of networking of wireless mesh network is synchronous
Method, to make up algorithm complex of the Network Synchronization processing method in existing wireless mesh network media access control layer in
The shortcomings of network scenarios networking processing is not present after height and not supporting node start.
The technical thought of the present invention is, by being improved to basic frame structure, design networks and synchronization mechanism,
Presynchronization is carried out using the Node ID of responsible node and the length of frame on the basis of improved frame structure, then utilizes propagation
Latency message precise synchronization, base maintenance processing when last, reach the synchronous effect of the whole network.
Realize the specific steps of the object of the invention including as follows：
(1) neighbor information table message is scanned：
The size setting listening period of (1a) according to Wireless MESH network scale；
(1b) network access node scans neighbor information table message of the Wireless MESH network in net node periodic broadcast；
(1c) judges whether network access node scans neighbor information table message in listening period, if so, then performing step
(2) step (1d), otherwise, is performed；
(1d) will not scan the network access node of neighbor information table message, after being set to lonely start node NodeID1, continue
Scan neighbor information table message, while periodic broadcast lonely start node Node ID1 neighbor information table message；
(2) judge that network access node is scanned in listening period to whether the node in neighbor information table message is to be saved in net
Point, if so, then performing step (3), otherwise, perform step (4)；
(3) network access node initiates networking request message in net node；
(4) responsible node is selected；
Network access node is labeled as lonely start node Node ID2 by (4a)；
(4b) judges the Node Identification Node in lonely start node Node ID1 and lonely start node Node ID2
Whether ID is equal, if so, then performing step (4c), otherwise, performs step (4d)；
It is next time adjacent that (4c) lonely start node Node ID1 and lonely start node Node ID2 continue reception simultaneously
Information table message；
(4d) selects Node Identification Node from lonely start node Node ID1 and lonely start node Node ID2
Node minimum ID is as responsible node；
(5) neighboring node list is filled：
In the neighbor information table message that network access node receives from the node in addition to network access node, extraction node address letter
Breath, all nodes in the node address information extracted are filled into the neighboring node list of network access node；
(6) synchronous network access node：
(6a) according to the following formula, calculates the network control time slot start time of network access node：
Tm=P+K-TNENT-m*TNCFG
Wherein, TmThe network control time slot start time of network access node is represented, P represents the physical layer in Wireless MESH network
The capture moment to neighbor information table message preserved, K represent the time division multiple acess TDMA frame that network access node receives from responsible node
In the Network Control sub-frame time, TNENTRepresent the network control in the time division multiple acess TDMA frame that network access node receives from responsible node
The network insertion moment of system frame, m represent the Node Identification extracted from the neighbor information table message of responsible node reception
Node ID sum, TNCFGRepresent the single net from the Network Control sub-frame in the time division multiple acess TDMA frame of responsible node reception
Network setup time；
(6b) network access node sends time division multiple acess when the network control time slot of current network access node starts to responsible node
TDMA frame, complete presynchronization of the network access node relative to responsible node；
(6c) is with allowing in network information of subtracting that responsible node the sends network of network access node control time slot start time
Propagation delay value, obtain network access node network control the time slot indifference time；
(6d), plus the network control time slot indifference time of current network access node, is entered with the local zone time of network access node
The indifference local zone time of net node；
(6e) network access node sends time division multiple acess TDMA when the indifference local zone time of present node starts, to responsible node
Frame, complete the precise synchronization of network access node and responsible node；
(7) node lock in time is safeguarded：
(7a), when the transmission cycle starts, sends propagation delay measurement request message to responsible node, is responsible in net node
Node receives propagation delay measurement request message and responds propagation delay measurement response message in net node backward；
Biography in the propagation delay measurement response message that the local zone time that (7b) is used in net node is sent plus responsible node
Time delay value is broadcast, obtains the indifference local zone time in net node；
(7c) sends time division multiple acess TDMA when net node starts in the indifference local zone time of present node, to responsible node
Frame, complete the time synchronized in net node and responsible node.
The present invention has advantages below compared with prior art
First, the present invention is when the Node Identification Node ID in lonely start node are equal, lonely start node
Receive neighbor information table message next time；The minimum nodes of Node Identification Node ID are selected from lonely start node, are made
For responsible node, the node is responsible for and the presynchronization of other nodes and reception networking request message and neighbor information table message；
Overcoming new node in the prior art needs from multiple pre-selection patronage nodes, selects a pre-selection patronage node as thick synchronous
Reference mode method is relatively complicated, screening conditions it is more have impact on reference mode efficiency of selection the problem of so that the present invention tool
The advantages of having the ability that can quickly select responsible node and shortening node network entry time expense.
Second, the local zone time of network access node of the present invention controls the time slot indifference moment plus the network of current network access node,
The indifference local zone time of network access node is obtained, network access node is when the indifference local zone time of present node starts, to responsible node
Time division multiple acess TDMA frame is sent, completes precise synchronization of the network access node relative to responsible node；Prior art node is overcome to enter
Net synchronous method complexity is high, realizes that difficulty is larger, very high using gps signal cost, the problem of not being suitable for small scale network,
So that to be provided with node networking synchronous method complexity low by the present invention, the advantages of realizing simple and applicable small scale network.
Brief description of the drawings
Fig. 1 is the flow chart of the present invention.
Embodiment：
1 couple of present invention is described in detail below in conjunction with the accompanying drawings.
Step 1, neighbor information table message is scanned.
Size setting listening period according to Wireless MESH network scale.
Network access node scans neighbor information table message of the Wireless MESH network in net node periodic broadcast.
Described neighbor information table message includes a hop node information all around current network node, node address letter
The Node ID values of breath, node type information, this node.
Judge whether network access node scans neighbor information table message in listening period, if so, step 2 is then performed, it is no
Then, the network access node of neighbor information table message will not be scanned, after being set to lonely start node Node ID1, is continued to scan on adjacent
Information table message, while periodic broadcast lonely start node Node ID1 neighbor information table message.
Step 2, judge that network access node is scanned in listening period to whether the node in neighbor information table message is in net
Node, if so, then performing step 3, otherwise, perform step 4.
Step 3, network access node initiates networking request message in net node.
Described networking request message includes networking applying type, transmission times count value, transmit power, responsible node
Node ID, network access node device id.
Step 4, responsible node is selected.
Network access node is labeled as lonely start node Node ID2.
Judge lonely start node Node ID1 is with the Node Identification Node ID in lonely start node Node ID2
It is no equal, if so, then performing the first step, otherwise, perform second step.
The first step, lonely start node Node ID1 and lonely start node Node ID2 continue to receive phase next time simultaneously
Adjacent information table message；
Second step, from lonely start node Node ID1 and lonely start node Node ID2, select Node Identification
Node minimum Node ID is as responsible node.
Step 5, neighboring node list is filled.
In the neighbor information table message that network access node receives from the node in addition to network access node, extraction node address letter
Breath, all nodes in the node address information extracted are filled into the neighboring node list of network access node.
Step 6, synchronous network access node.
According to the following formula, the network control time slot start time of network access node is calculated：
Tm=P+K-TNENT-m*TNCFG
Wherein, TmThe network control time slot start time of network access node is represented, P represents the physical layer in Wireless MESH network
The capture moment to neighbor information table message preserved, K represent the time division multiple acess TDMA frame that network access node receives from responsible node
In the Network Control sub-frame time, TNENTRepresent the network control in the time division multiple acess TDMA frame that network access node receives from responsible node
The network insertion moment of system frame, m represent the Node Identification extracted from the neighbor information table message of responsible node reception
Node ID sum, TNCFGRepresent the single net from the Network Control sub-frame in the time division multiple acess TDMA frame of responsible node reception
Network setup time.
Described time division multiple acess TDMA frame includes a Network Control sub-frame and L data burst, wherein, L is by wireless
The scale of MESH network determines.
Described Network Control sub-frame includes a network insertion subframe and N2 network configuration subframe, wherein, N2 and nothing
The total node number of line MESH network is equal.
Network access node sends time division multiple acess TDMA when the network control time slot of current network access node starts to responsible node
Frame, complete presynchronization of the network access node relative to responsible node.
The biography allowed in network information of responsible node transmission is subtracted with the network control time slot start time of network access node
Time delay value is broadcast, obtains the network control time slot indifference time of network access node.
Described allows networking message to include the device id of network access node, Node ID of network access node, frame number, synchronization
Propagation delay, the responsible node that hop count, the device id of responsible node, responsible node estimate to network access node distribute to networking section
The Node ID of point.
The time slot indifference time is controlled plus the network of current network access node with the local zone time of network access node, obtains the section that networks
The indifference local zone time of point.
Network access node sends time division multiple acess TDMA frame when the indifference local zone time of present node starts, to responsible node,
Complete the precise synchronization of network access node and responsible node.
Step 7, node lock in time is safeguarded.
In net node when the transmission cycle starts, propagation delay measurement request message, responsible node are sent to responsible node
Receive propagation delay measurement request message and respond propagation delay measurement response message in net node backward.
Described propagation delay measurement request message is included in the device id, the NodeID in net node, frame volume of net node
Number, the Node ID of synchronous hop count, responsible node.
Described propagation delay measurement response message includes the device id of responsible node, the NodeID of responsible node, frame and compiled
Number, synchronous hop count, in Node ID of net node, responsible node to the propagation delay between net node.
When the propagation delay sent used in the local zone time of net node plus responsible node measures the propagation in response message
Prolong value, obtain the indifference local zone time in net node.
When net node starts in the indifference local zone time of present node, time division multiple acess TDMA frame is sent to responsible node,
Complete the time synchronized in net node and responsible node.
Claims (8)
1. the networking synchronous method of a kind of Wireless MESH network, it is characterised in that comprise the following steps：
(1) neighbor information table message is scanned：
The size setting listening period of (1a) according to Wireless MESH network scale；
(1b) network access node scans neighbor information table message of the Wireless MESH network in net node periodic broadcast；
(1c) judges whether network access node scans neighbor information table message in listening period, if so, step (2) is then performed,
Otherwise, step (1d) is performed；
(1d) will not scan the network access node of neighbor information table message, after being set to lonely start node Node ID1, continue to sweep
Retouch neighbor information table message, while periodic broadcast lonely start node Node ID1 neighbor information table message；
(2) judge network access node scanned in listening period to the node in neighbor information table message whether be in net node, if
It is then to perform step (3), otherwise, performs step (4)；
(3) network access node initiates networking request message in net node；
(4) responsible node is selected；
Network access node is labeled as lonely start node Node ID2 by (4a)；
(4b) judges that lonely start node Node ID1 are with the Node Identification Node ID in lonely start node Node ID2
It is no equal, if so, then performing step (4c), otherwise, perform step (4d)；
(4c) lonely start node Node ID1 and lonely start node Node ID2 continue to receive neighbor information next time simultaneously
Table message；
(4d) selects Node Identification Node ID most from lonely start node Node ID1 and lonely start node Node ID2
Small node is as responsible node；
(5) neighboring node list is filled：
In the neighbor information table message that network access node receives from the node in addition to network access node, node address information is extracted,
All nodes in the node address information extracted are filled into the neighboring node list of network access node；
(6) synchronous network access node：
(6a) according to the following formula, calculates the network control time slot start time of network access node：
Tm=P+K-TNENT-m*TNCFG
Wherein, TmThe network control time slot start time of network access node is represented, P represents that the physical layer in Wireless MESH network preserves
The capture moment to neighbor information table message, K represented in the time division multiple acess TDMA frame that is received from responsible node of network access node
Network Control sub-frame time, TNENTRepresent network control in the time division multiple acess TDMA frame that network access node receives from responsible node
The network insertion moment of frame, m represent the Node Identification Node ID extracted from the neighbor information table message of responsible node reception
Sum, TNCFGWhen the single network of Network Control sub-frame in the time division multiple acess TDMA frame for representing to receive from responsible node configures
Between；
(6b) network access node sends time division multiple acess TDMA when the network control time slot of current network access node starts to responsible node
Frame, complete presynchronization of the network access node relative to responsible node；
(6c) subtracts the biography allowed in network information of responsible node transmission with the network control time slot start time of network access node
Time delay value is broadcast, obtains the network control time slot indifference time of network access node；
(6d), plus the network control time slot indifference time of current network access node, obtains the section that networks with the local zone time of network access node
The indifference local zone time of point；
(6e) network access node sends time division multiple acess TDMA frame when the indifference local zone time of present node starts, to responsible node,
Complete the precise synchronization of network access node and responsible node；
(7) node lock in time is safeguarded：
(7a), when the transmission cycle starts, propagation delay measurement request message, responsible node is sent to responsible node in net node
Receive propagation delay measurement request message and respond propagation delay measurement response message in net node backward；
When the local zone time that (7b) is used in net node measures the propagation in response message plus the propagation delay that responsible node is sent
Prolong value, obtain the indifference local zone time in net node；
(7c) sends time division multiple acess TDMA frame when net node starts in the indifference local zone time of present node, to responsible node,
Complete the time synchronized in net node and responsible node.
2. the networking synchronous method of a kind of Wireless MESH network according to claim 1, it is characterised in that in step (1b)
Described neighbor information table message includes a hop node information all around current network node, node address information, node
The Node ID values of type information, this node.
3. the networking synchronous method of a kind of Wireless MESH network according to claim 1, it is characterised in that in step (3)
Described networking request message include networking applying type, transmission times count value, transmit power, responsible node Node ID,
The device id of network access node.
4. the networking synchronous method of a kind of Wireless MESH network according to claim 1, it is characterised in that in step (6a)
Described time division multiple acess TDMA frame includes a Network Control sub-frame and L data burst, wherein, L is by Wireless MESH network
Scale determines.
5. the networking synchronous method of a kind of Wireless MESH network according to claim 1, it is characterised in that in step (6a)
Described Network Control sub-frame includes a network insertion subframe and N2 network configuration subframe, wherein, N2 and Wireless MESH net
The total node number of network is equal.
6. the networking synchronous method of a kind of Wireless MESH network according to claim 1, it is characterised in that in step (6c)
It is described to allow networking message to include the device id of network access node, Node ID of network access node, frame number, synchronous hop count, be responsible for
Propagation delay, the responsible node that device id, the responsible node of node estimate to network access node distribute to the Node of network access node
ID。
7. the networking synchronous method of a kind of Wireless MESH network according to claim 1, it is characterised in that in step (7a)
Described propagation delay measurement request message is included in the device id of net node, Node ID in net node, frame number, synchronization
The Node ID of hop count, responsible node.
8. the networking synchronous method of a kind of Wireless MESH network according to claim 1, it is characterised in that in step (7a)
Described propagation delay measurement response message includes the device id of responsible node, Node ID of responsible node, frame number, synchronization
Hop count, in Node ID of net node, responsible node to the propagation delay between net node.
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| CN116095815A (en) * | 2023-04-11 | 2023-05-09 | 天津七一二通信广播股份有限公司 | TDMA and routing protocol fusion method and fusion system based on neighbor node information |
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