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Access method, mobile device and underwater sensor network system

An access method and underwater sensing technology, which are applied in the field of mobile devices and underwater sensor network systems, can solve the problems of difficult implementation of allocation algorithms, transmission failures, and reduced network throughput, so as to meet practical application requirements and provide strong support. Compatibility and flexibility, effect of low control signaling overhead

Inactive Publication Date: 2019-09-13
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both have their own advantages and disadvantages. The contention-based MAC protocol has strong scalability and can flexibly deal with the access and exit of nodes. However, when the network load is heavy, conflicts are prone to occur, resulting in problems such as reduced network throughput, energy consumption, and even transmission failure. ; The allocation-based MAC protocol does not require additional control overhead, each node shares the channel fairly, and can effectively avoid problems such as collisions, but the channel utilization rate is low, and it cannot flexibly deal with node movement, access and exit, and the allocation algorithm is difficult in underwater Realization and other issues

Method used

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  • Access method, mobile device and underwater sensor network system
  • Access method, mobile device and underwater sensor network system
  • Access method, mobile device and underwater sensor network system

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0039] figure 2 It is a flow chart showing the access method for the mobile node to access the underwater sensor network in the first embodiment.

[0040] In the sending step 201, the mobile node sends a positioning request packet to all fixed nodes in the underwater sensor network in a broadcast manner.

[0041] The network discovery is realized through the above sending step 201 . Specifically, the mobile node broadcasts a location request packet to all fixed nodes to discover the fixed nodes.

[0042] In order to flexibly cope with the influence of the movement of the mobile node, it is preferable to repeat the above sending step 201 every fixed time.

[0043]In the selection step 202, the mobile node selects the nearest fixed node as the relay node according to the confirmation packet returned from the fixed node that received the location request packet.

[0044] In the communication step 203, the mobile node sends a data packet for reporting its own status informatio...

no. 2 approach

[0047] image 3 It is a flow chart showing the access method for the mobile node to access the underwater sensor network in the second embodiment.

[0048] In step 301, the mobile node broadcasts a location request packet to N fixed nodes. Where N is the number of fixed nodes included in the underwater sensor network, and N is a natural number greater than or equal to 1.

[0049] In step 302, the mobile node waits for time T w .

[0050] Among them, the waiting time T w It can be preset as the time required to receive acknowledgment packets from all fixed nodes. Here, the waiting time T can be preset according to the path delay between the fixed node and the mobile node and the delay of each fixed node replying the acknowledgment packet w .

[0051] In step 303, the mobile node judges whether to receive an acknowledgment packet, if it is judged that no acknowledgment packet has been received ("No" in step 303), then enter into step 304, if it is judged to receive an ackn...

no. 3 approach

[0065] In the underwater sensor network, in order to avoid the collision of the confirmation packets replied by each fixed node, each fixed node delays a certain time to reply after receiving the positioning request packet. In the third embodiment, in order to avoid the collision of the acknowledgment packets, it is assumed that each fixed node delays nT after receiving the positioning request packet Δτ Reply, where n (0≤n≤N-1) is the number of a fixed node. For example, the delay times of fixed nodes 0, 1, 2, 3, 4, n... are 0, T respectively Δτ , 2T Δτ 、3T Δτ 、4T Δτ , nT Δτ ..., where T Δτ It is a fixed delay for fixed nodes to reply confirmation packets one by one. In order to ensure no collision, it is preferable to set T Δτ It is preset to be larger than the transmission time difference between the mobile node and any two fixed nodes.

[0066] In the third embodiment, the mobile node needs to receive the confirmation packets replied by all the fixed nodes, image ...

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Abstract

The invention discloses an access method, a mobile device and an underwater sensor network system. The access method is used for a mobile node to access an underwater sensing network. The underwater sensor network comprises a plurality of fixed nodes. One of the plurality of fixed nodes is a central node used for communicating with a control center, and the access method comprises the following steps: the mobile node sending a request positioning packet to the plurality of fixed nodes in a broadcast manner; selecting the nearest fixed node as a relay node by the mobile node according to a confirmation packet replied by the fixed node receiving the request positioning packet; and a communication step in which the mobile node transmits a data packet for reporting the state information of themobile node itself to the center node through the relay node selected in the selection step.

Description

technical field [0001] The invention relates to the technical field related to underwater communication, in particular to an access method for a mobile node to access an underwater sensor network, a mobile device, and an underwater sensor network system. Background technique [0002] Under-Water Acoustic Sensor Networks (UW-ASNs) is to deploy various sensors in a certain area of ​​the underwater area to collect and obtain information, and realize the mutual transmission of information through mutual communication and networking between nodes. , and finally transmit the information obtained in the coverage area to the underwater communication network provided by the shore to the observer by radio or wire through the master node. UW-ASNs play an extremely important role in the fields of seabed detection, marine environment monitoring, earthquake and tsunami prediction, underwater target tracking and positioning, etc., and have very high research value. At present, network sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W40/20H04W40/22H04W48/20H04W74/08H04L12/733H04L45/122
CPCH04W40/20H04W40/22H04W48/20H04W74/085H04L45/126
Inventor 鄢社锋徐立军赵晴晴
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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