Method for dynamically adjusting topology update period of wireless sensor network

Abstract

The invention discloses a method for dynamically adjusting a topology update period of a wireless sensor network. The method comprises: when each terminal node of the WSN is opened; the time slot of the initial broadcast route announcement packet is set as a random value within a specified range; topology construction instability period, each terminal node detects that the number of times of inconsistent information exceeds a preset threshold value; if yes, reducing a time slot of a broadcast routing announcement packet to quickly send a large amount of announcement information, quickly building a network, setting more consistent messages, increasing a period and inhibiting topology updating when the network is stable, setting a redundant parameter and inconsistent message counter at the moment, initializing a topology updating period if a threshold value is exceeded, and otherwise, continuing to monitor. According to the method, aiming at the condition of WSN multi-node network networking, the stability of a subsequent network can be maintained while the construction of an initial topology is accelerated.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a method for dynamically adjusting the topology update period of a wireless sensor network. Background technique [0002] In the prior art, the relevant routing protocols usually update the topology once at a fixed period, or each time the update period is adjusted to a multiple of a fixed duration. In the RIP routing protocol, RIP broadcasts routing control information every 30 seconds at regular intervals, and RIP stipulates waiting If it exceeds 6 times (180 seconds), the connection will be closed. In the OSPF routing protocol, the HELL0 message timer is sent every 10 seconds, and the hold time is 40 seconds, that is, if the hello is not received within 40 seconds, it is considered that the residence does not exist. In non-broadcast networks (frame relay), every It is sent every 30 seconds, and the hold time is 120 seconds. However, due to the fixed time slot in ...

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Problems solved by technology

In the OSPF routing protocol, the HELL0 message timer is sent every 10 seconds, and the hold time is 40 seconds, that is, if the hello is not received within 40 seconds, it is considered that the residence does not exist. In non-broadcast networks (frame relay), every Send once every 30 seconds, hold time 120 seconds, and the above method may not update the topology in time due to the fixed time slot

[0003] In the RPL routing protocol, with the increase of time, more consistent information is received, the route tends to be stable, and the topology update cycle also increases, which me...

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