CN101800592A - Supporting node mobility method based on node speed - Google Patents

Supporting node mobility method based on node speed Download PDF

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CN101800592A
CN101800592A CN201010033642A CN201010033642A CN101800592A CN 101800592 A CN101800592 A CN 101800592A CN 201010033642 A CN201010033642 A CN 201010033642A CN 201010033642 A CN201010033642 A CN 201010033642A CN 101800592 A CN101800592 A CN 101800592A
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mobile node
msync
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彭绯
李德亮
钱德沛
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Beihang University
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    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract

The invention discloses a supporting node mobility method based on node speed, a new neighbor node is obtained through judging whether a mobile synchronization frame MSYNC which is sent by a mobile node is replied or not by the method, the distance between the new neighbor node and the mobile node is obtained by the new neighbor node by receiving the strength of a MSYNC signal, meanwhile, whether replying MACK or not to the mobile node is determined through a judgment condition; after the judgment condition is met, the time interval for sending the MSYNC next time by the mobile node is calculated by the new neighbor node through the static neighbor information of the new neighbor node and the state information of the mobile node. The judgment condition is that: an included angle of a directed line segment and the moving direction of a mobile node m is bigger than 90 degrees, and the distance between the mobile node m and a new neighbor node n is less than a transmission range R. The energy consumption which is caused by frequent periodicity neighbor searching is avoided by the method in the invention, the scheduling information of a new cluster is quickly obtained when the mobile node moves among clusters, and mass lost packages which are caused by the differences of period scheduling are reduced.

Description

A kind of support node mobility method based on node speed
Technical field
The present invention relates to a kind of support node mobility method, more particularly say, be meant the support node mobility method based on node speed of a kind of MAC (MediaAccess Control, medium access control) layer, this method is applied to wireless sensor network.
Background technology
Along with wireless sensor network more and more is applied in the mobile scene, for example movable object tracking, patient health monitoring, original MAC agreement can not satisfy requirement energy-conservation and service quality (QoS), not only consumes big energy, and the packet loss of data also increases greatly.Therefore in the wireless sensor network MAC design of protocol, consider ambulant effective support is very important.
S-MAC is typical MAC agreement based on competition in the wireless sensor network, and each node adopts and intercepts-sleep cycle saving energy.Node with identical intercepting-sleep scheduling forms a virtual cluster, and boundary node writes down two or more scheduling.For fear of clock drift, each node all will periodically send synchronization frame (SYNC) and broadcast the scheduling of oneself, thereby keeps synchronously with neighbor node.In order to prevent to can not receive mutually between neighbor node the other side's SYNC, each node all will periodically carry out neighbours' search procedure.When a node has a neighbor node at least, approximately carried out neighbours in per 5 minutes and search; If the neighbor node number of a node is 0, just carried out neighbours and search in then about 30 seconds.S-MAC can well work when network is static state.But when node motion,, have to wait for about 5 minutes and just can carry out neighbours' search procedure, therefore not only waste energy but also can increase packet loss because mobile node enters into the virtual cluster of following another scheduling.The frequency (one minute twice) that the neighbours of increase mobile node search when mobile node does not have neighbor node among the S-MAC, so really, accelerated the speed that mobile node and new neighbor connect, but this is a kind of method of reaction equation, only just can be activated being connected under the situation of all losing with all of mobile node.Therefore setting up the new time that connects can be longer.
Summary of the invention
On the basis of S-MAC, the present invention proposes a kind of support node mobility method of supporting mobility mechanism based on node speed.Mobile node m regulates the notification time interval that sends synchronization frame according to the translational speed V of self in this method, and connect fast with new neighbor node n, avoid frequent periodicity neighbours to search and brought energy expense, and bunch between obtain new bunch schedule information when mobile fast, reduced because a large amount of packet losses that the periodic scheduling difference is brought.
A kind of support node mobility method of the present invention based on node speed, this method includes following execution in step:
The first step: revise the synchronous frame stucture that mobile node sends
Mobile node m only sends mobile synchronization frame MSYNC, this mobile synchronization frame MSYNC is one hexa-atomic group, its structure is MSYNC={type, srcAddr, syncnode, sleepTime, crc, v}, type represent the type of the packet received, and srcAddr represents sender's address, syncnode represents to dispatch promoter's node serial number, sleepTime represents that the sender sends this synchronization frame and enters the time interval of next time sleep to the sender, and crc represents cyclic redundancy check (CRC) code, and v represents the translational speed of mobile node m;
As receiving that the node of the mobile synchronization frame MSYNC of this mobile node m is called the new neighbor node n of mobile node m for the first time, this new neighbor node n only replys at mobile synchronization frame MSYNC and replys synchronization frame MACK, this answer synchronization frame MACK is one seven tuple, its structure is MACK={type, srcAddr, syncnode1, sleepTime1, syncnode2, sleepTime2, NextAnnounceInterval}, type represents the type of the packet received, srcAddr represents sender's address, syncnode1 represents master scheduling promoter's node serial number, and sleepTime1 represents the master scheduling of new neighbor node n, syncnode2 vice scheduling promoter's node serial number, sleepTime2 represents the pair scheduling of new neighbor node n, and NextAnnounceInterval represents that mobile node m broadcasts the time interval of MSYNC next time;
Second step: the notification time interval of determining mobile synchronization frame
(A) transmission range of each node in the wireless sensor network is designated as R, and the transmission range R of each node is identical;
(B) each node is known the static or mobile state information that is own of living in by GPS;
(C) new neighbor node n obtains distance between self and the mobile node by the intensity that receives the MSYNC signal;
(D) the new neighbor node n that receives MSYNC judges oneself whether to postback MACK to mobile node according to the information in self neighbor list;
Decision condition is: utilize directed line segment
Figure G2010100336423D00021
Angle with the moving direction of mobile node m
Figure G2010100336423D00022
Should be greater than 90 degree, and the distance between mobile node m and the new neighbor node n is less than transmission range R;
Figure G2010100336423D00023
Middle n represents to receive the node of MSYNC, and b represents the neighbor node of node n, the direction that → expression is moved;
(E) after having satisfied step (D), new neighbor node n calculates the time interval that mobile node m sends MSYNC next time by static neighbor information of self and the state information of mobile node m, and concrete steps are:
(1) calculates mobile node m to the distance L between the node i
The central point that connects mobile node m, new neighbor node n and node i constitutes a triangle; Can obtain mobile node m to the distance L between the node i, L according to the cosine law 2=L 1 2+ L 2 2-2L 1L 2Cos θ, L 1Expression new neighbor node n is to the distance between the node i, L 2Expression mobile node m is to the distance between the new neighbor node n, and θ represents L 1With L 2Between angle;
(2) judge whether mobile node m enters the communication range of node i
Judge R 〉=Lsin| β-γ | whether satisfy; L represents mobile node m to the distance between the node i, and β represents L 2And the angle between the moving direction extended line of mobile node m, γ represents L and L 2Between angle, R represents the transmission range of node;
(3) time interval of next time sending MSYNC of calculating mobile node m
Connect another triangle of central point that mobile node m, intersection point O and node i constitute; Obtain displacement d in the transmission range that mobile node m moves to node i according to the cosine law, , d represents that mobile node m moves to the interior displacement of transmission range of node i.
Described support node mobility method based on node speed, node in its wireless sensor network and the distance between the node are mapped under the plane coordinate system.
Described support node mobility method based on node speed, the synchronization frame information of modification mobile node m in the first step helps reducing the node energy expense, improve the utilance of node, be convenient to carry out the neighbours' renewal and the scheduling renewal of mobile node simultaneously.
The advantage of a kind of support node mobility method based on node speed of the present invention is:
(1) this method can guarantee the connection of mobile node in network, makes mobile node and neighbours on every side have good connectedness.
(2) this method has been improved the performance aspect service quality, is all improving significantly aspect packet loss, throughput, the end-to-end delay.
(3) this method is by translational speed V, transmission range and three factors of neighbours' topology, and the transmission of dynamic adjustments synchronization frame neither can be searched because of frequent neighbours and consume energy, also can be owing to the long decline that causes service quality performance neighbours' search cycle.
Description of drawings
Fig. 1 is the sensing relation schematic diagram of mobile node of the present invention and new neighbor node.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
The present invention is a kind of support node mobility method based on node speed, and this method includes following execution in step:
The first step: revise the synchronous frame stucture that mobile node sends
The former synchronization frame SYNC of the S-MAC that each node in wireless sensor network sends, the SYNC structure is SYNC={type, srcAddr, syncnode, sleepTime, crc}, type represents the type of the packet received, and srcAddr represents sender's address, and syncnode represents to dispatch promoter's node serial number, sleepTime represents that the sender sends this synchronization frame and enters the time interval of next time sleep to the sender, and crc represents cyclic redundancy check (CRC) code.
In the present invention, mobile node m only sends mobile synchronization frame MSYNC={type, srcAddr, syncnode, sleepTime, crc, v}, type represents the type of the packet received, srcAddr represents sender's address, and syncnode represents to dispatch promoter's node serial number, and sleepTime represents that the sender sends this synchronization frame enters next time sleep to the sender the time interval, crc represents cyclic redundancy check (CRC) code, and v represents the translational speed of mobile node m.This mobile synchronization frame MSYNC is the translational speed information that has increased mobile node m on former synchronization frame SYNC basis.
As receiving that the node of the mobile synchronization frame MSYNC of this mobile node m is called the new neighbor node n of mobile node m for the first time, this new neighbor node n only replys at mobile synchronization frame MSYNC and replys synchronization frame MACK, MACK={type, srcAddr, syncnode1, sleepTime1, syncnode2, sleepTime2, NextAnnounceInterval}, type represents the type of the packet received, and srcAddr represents sender's address, and syncnode1 represents master scheduling promoter's node serial number, sleepTime1 represents the master scheduling of new neighbor node n, syncnode2 vice scheduling promoter's node serial number, sleepTime2 are represented the pair scheduling of new neighbor node n, and NextAnnounceInterval represents that mobile node m broadcasts the time interval of MSYNC next time.
In replying synchronization frame MACK, new neighbor node n is up to two schedule informations.If new neighbor node n be bunch in stationary node, then sleepTime2 is a sky; If new neighbor node n is a boundary node, then sleepTime2 is not empty.
In the present invention, the synchronization frame information of revising mobile node m helps reducing the node energy expense, improves the utilance of node, is convenient to carry out the neighbours' renewal and the scheduling renewal of mobile node simultaneously.
Second step: the notification time interval of determining mobile synchronization frame
(A) transmission range of each node in the wireless sensor network is designated as R, and the transmission range R of each node is identical;
In the present invention, the node that can receive the mobile synchronization frame MSYNC information of mobile node m broadcasting is called the neighbor node of mobile node m.Each mobile node is all set up a neighbor list, is used to write down the neighbours' of this node information such as numbering, distance and/or state.Among Fig. 1, m is a mobile node, and then the transmission range of mobile node m is to be the center of circle with m, and transmission range R is the included dashed circle of radius; Because m is a mobile node, relative i, n, a, b, c, g are stationary node; Because n, b, c, g node event in the transmission range of mobile node m is the neighbor node of m.The neighbor node that becomes mobile node m is to send once mobile synchronization frame MSYNC information with mobile node m can receive to be condition, when mobile node m sends the node that mobile synchronization frame MSYNC information can not be received next time, then can not become the neighbor node of mobile node m, so the neighbor list of mobile node changes.
(B) each node is known the static or mobile state information that is own of living in by GPS;
In the present invention, if node moves, it knows the translational speed of oneself.If node is static, this node is known the distance between it and the static neighbours on every side.
(C) new neighbor node n obtains distance between self and the mobile node by the intensity that receives the MSYNC signal;
(D) the new neighbor node n that receives MSYNC judges oneself whether to postback MACK to mobile node according to the information in self neighbor list;
Decision condition is: utilize directed line segment
Figure G2010100336423D00051
Angle with the moving direction of mobile node m Should be greater than 90 degree, and the distance between mobile node m and the new neighbor node n is less than transmission range R.
Figure G2010100336423D00053
Middle n represents to receive the node of MSYNC, and b represents the neighbor node of node n, the direction that → expression is moved.
In the present invention, the distance between node and the node is mapped under the plane coordinate system, so the travel direction of mobile node is up north and down south commonly used, left west and right east.
(E) after having satisfied step (D), new neighbor node n calculates the time interval that mobile node m sends MSYNC next time by static neighbor information of self and the state information of mobile node m, and concrete steps are:
(1) calculates mobile node m to the distance L between the node i
In the present invention, the triangle of central point formation that connects mobile node m, new neighbor node n and node i.Can obtain mobile node m to the distance L between the node i, L according to the cosine law 2=L 1 2+ L 2 2-2L 1L 2Cos θ, L 1Expression new neighbor node n is to the distance between the node i, and L2 represents mobile node m to the distance between the new neighbor node n, and θ represents L 1With L 2Between angle.
(2) judge whether mobile node m enters the communication range of node i
In the present invention, judge R 〉=Lsin| β-γ | whether satisfy.L represents mobile node m to the distance between the node i, and β represents L 2And the angle between the moving direction extended line of mobile node m, γ represents L and L 2Between angle, R represents the transmission range of node.
(3) time interval of next time sending MSYNC of calculating mobile node m
In the present invention, connect another triangle of central point that mobile node m, intersection point O (intersection point of the moving direction extended line of the transmission range of node i and mobile node m) and node i constitute.Can obtain displacement d in the transmission range that mobile node m moves to node i according to the cosine law,
Figure G2010100336423D00061
, d represents that mobile node m moves to the interior displacement of transmission range of node i.
Because a node has several neighbours, therefore at interval according to minimum notification time
Figure G2010100336423D00062
Obtain the time interval of next time sending MSYNC of mobile node m.
Figure G2010100336423D00063
In, f iRepresent minimum notification time at interval, d iExpression mobile node m moves to the transmission range of node i, and v represents the translational speed of mobile node m.
At the support node mobility method based on node speed of the present invention, whether this method makes answering by the mobile synchronization frame MSYNC that mobile node is sent is obtained the new neighbor node, the new neighbor node obtains distance between self and the mobile node by the intensity that receives the MSYNC signal then, chooses whether postback MACK to mobile node by decision condition simultaneously; After having satisfied decision condition, the new neighbor node calculates the time interval that mobile node sends MSYNC next time by the static neighbor information of self and the state information of mobile node.Method of the present invention has been avoided frequent periodicity neighbours to search and has been brought energy expense, and bunch between obtain new bunch schedule information when mobile fast, reduced because a large amount of packet losses that the periodic scheduling difference is brought.

Claims (6)

1. support node mobility method based on node speed is characterized in that this method includes following execution in step:
The first step: revise the synchronous frame stucture that mobile node sends
Mobile node m only sends mobile synchronization frame MSYNC, this mobile synchronization frame MSYNC is one hexa-atomic group, its structure is MSYNC={type, srcAddr, syncnode, sleepTime, crc, v}, type represent the type of the packet received, and srcAddr represents sender's address, syncnode represents to dispatch promoter's node serial number, sleepTime represents that the sender sends this synchronization frame and enters the time interval of next time sleep to the sender, and crc represents cyclic redundancy check (CRC) code, and v represents the translational speed of mobile node m;
As receiving that the node of the mobile synchronization frame MSYNC of this mobile node m is called the new neighbor node n of mobile node m for the first time, this new neighbor node n only replys at mobile synchronization frame MSYNC and replys synchronization frame MACK, this answer synchronization frame MACK is one seven tuple, its structure is MACK={type, srcAddr, syncnode1, sleepTime1, syncnode2, sleepTime2, NextAnnounceInterval}, type represents the type of the packet received, srcAddr represents sender's address, syncnode1 represents master scheduling promoter's node serial number, and sleepTime1 represents the master scheduling of new neighbor node n, syncnode2 vice scheduling promoter's node serial number, sleepTime2 represents the pair scheduling of new neighbor node n, and NextAnnounceInterval represents that mobile node m broadcasts the time interval of MSYNC next time;
Second step: the notification time interval of determining mobile synchronization frame
(A) transmission range of each node in the wireless sensor network is designated as R, and the transmission range R of each node is identical;
(B) each node is known the static or mobile state information that is own of living in by GPS;
(C) new neighbor node n obtains distance between self and the mobile node by the intensity that receives the MSYNC signal;
(D) the new neighbor node n that receives MSYNC judges oneself whether to postback MACK to mobile node according to the information in self neighbor list;
Decision condition is: utilize directed line segment
Figure F2010100336423C00011
Angle with the moving direction of mobile node m
Figure F2010100336423C00012
Should be greater than 90 degree, and the distance between mobile node m and the new neighbor node n is less than transmission range R;
Figure F2010100336423C00013
Middle n represents to receive the node of MSYNC, and b represents the neighbor node of node n, the direction that → expression is moved;
(E) after having satisfied step (D), new neighbor node n calculates the time interval that mobile node m sends MSYNC next time by static neighbor information of self and the state information of mobile node m, and concrete steps are:
(1) calculates mobile node m to the distance L between the node i
The central point that connects mobile node m, new neighbor node n and node i constitutes a triangle; Can obtain mobile node m to the distance L between the node i, L according to the cosine law 2=L 1 2+ L 2 2-2L 1L 2Cos θ, L 1Expression new neighbor node n is to the distance between the node i, L 2Expression mobile node m is to the distance between the new neighbor node n, and θ represents L 1With L 2Between angle;
(2) judge whether mobile node m enters the communication range of node i
Judge R 〉=Lsin| β-γ | whether satisfy; L represents mobile node m to the distance between the node i, and β represents L 2And the angle between the moving direction extended line of mobile node m, γ represents L and L 2Between angle, R represents the transmission range of node;
(3) time interval of next time sending MSYNC of calculating mobile node m
Connect another triangle of central point that mobile node m, intersection point O and node i constitute; Obtain displacement d in the transmission range that mobile node m moves to node i according to the cosine law, d = L cos ( β - γ ) + R 2 - L 2 sin 2 ( β - γ ) , D represents that mobile node m moves to the interior displacement of transmission range of node i.
2. the support node mobility method based on node speed according to claim 1 is characterized in that: new neighbor node n is up to two schedule informations in replying synchronization frame MACK.
3. the support node mobility method based on node speed according to claim 1 is characterized in that: new neighbor node n when replying synchronization frame MACK, if new neighbor node n be bunch in stationary node, then sleepTime2 is a sky; If new neighbor node n is a boundary node, then sleepTime2 is not empty.
4. the support node mobility method based on node speed according to claim 1 is characterized in that: because a node has several neighbours, therefore according to minimum notification time at interval
Figure F2010100336423C00022
Obtain the time interval of next time sending MSYNC of mobile node m;
Figure F2010100336423C00023
In, f iRepresent minimum notification time at interval, d iExpression mobile node m moves to the transmission range of node i, and v represents the translational speed of mobile node m.
5. the support node mobility method based on node speed according to claim 1 is characterized in that: node in the wireless sensor network and the distance between the node are mapped under the plane coordinate system.
6. the support node mobility method based on node speed according to claim 1, it is characterized in that: the synchronization frame information of the modification mobile node m in the first step helps reducing the node energy expense, improve the utilance of node, be convenient to carry out the neighbours' renewal and the scheduling renewal of mobile node simultaneously.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102118278A (en) * 2010-12-31 2011-07-06 网宿科技股份有限公司 Method and system for measuring network conditions as well as method for monitoring network coverage
CN102547973A (en) * 2010-12-17 2012-07-04 上海工程技术大学 RSSI (received signal strength indicator)-based multi-sensor fusion mobile node tracking method
CN105072579A (en) * 2015-08-25 2015-11-18 上海理工大学 Data transmission path acquisition method and data acquisition system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101520502B (en) * 2009-03-24 2011-09-14 中国航空无线电电子研究所 Method for tracking and positioning mobile node of wireless sensor network

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102547973A (en) * 2010-12-17 2012-07-04 上海工程技术大学 RSSI (received signal strength indicator)-based multi-sensor fusion mobile node tracking method
CN102547973B (en) * 2010-12-17 2014-12-10 上海工程技术大学 RSSI (received signal strength indicator)-based multi-sensor fusion mobile node tracking method
CN102118278A (en) * 2010-12-31 2011-07-06 网宿科技股份有限公司 Method and system for measuring network conditions as well as method for monitoring network coverage
CN102118278B (en) * 2010-12-31 2013-05-08 网宿科技股份有限公司 Method and system for measuring network conditions as well as method for monitoring network coverage
CN105072579A (en) * 2015-08-25 2015-11-18 上海理工大学 Data transmission path acquisition method and data acquisition system
CN105072579B (en) * 2015-08-25 2019-01-29 上海理工大学 Data transfer path acquisition methods and data collection system

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