Supporting node mobility method based on node speed

A technology that supports nodes and mobility. It is applied in the direction of climate sustainability, sustainable building, energy-saving ICT, etc. It can solve the problem of long time and achieve the effect of improving performance, good connectivity, and end-to-end delay improvement.

Inactive Publication Date: 2013-07-31
BEIHANG UNIV
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  • Application Information

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so it will take longer to establish a new connection

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  • Supporting node mobility method based on node speed

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Embodiment Construction

[0030] The present invention will be further described in detail below with reference to the accompanying drawings.

[0031] The present invention is a method for supporting node mobility based on node speed, and the method includes the following execution steps:

[0032] Step 1: Modify the synchronization frame structure sent by the mobile node

[0033] The S-MAC original synchronization frame SYNC sent by each node in the wireless sensor network, the SYNC structure is SYNC={type, srcAddr, syncnode, sleepTime, crc}, type indicates the type of the received data packet, srcAddr indicates the sender address, syncnode represents the node number of the scheduling initiator, sleepTime represents the time interval from when the sender sends the synchronization frame until the sender enters the next sleep, and crc represents the cyclic redundancy check code.

[0034] In the present invention, the mobile node m only sends out the mobile synchronization frame MSYNC={type, srcAddr, syn...

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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, whetherreplying 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

technical field [0001] The present invention relates to a method for supporting node mobility, more particularly, to a method for supporting node mobility based on node speed in a MAC (Media Access Control, medium access control) layer, and the method is applied to a wireless sensor network . Background technique [0002] With the increasing application of wireless sensor networks in mobile scenarios, such as moving target tracking and patient health monitoring, the original MAC protocol can no longer meet the requirements of energy saving and quality of service (QoS). The packet loss rate is also greatly increased. Therefore, it is very necessary to consider the effective support for mobility in the design of MAC protocol of wireless sensor network. [0003] S-MAC is a typical contention-based MAC protocol in wireless sensor networks, and each node uses a listen-sleep cycle to save energy. Nodes with the same listen-sleep schedule form a virtual cluster, and border nodes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26H04W28/04H04W84/18
CPCY02B60/50Y02D30/70
Inventor 彭绯李德亮钱德沛
Owner BEIHANG UNIV
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