Method for reducing data transmission delay by adopting dynamic duty cycle by wireless sensor network
A technology of wireless sensor and dynamic duty cycle, applied in wireless communication, network topology, electrical components, etc., to achieve the effect of maintaining network life, delay and energy utilization efficiency performance improvement, and high network life
Active Publication Date: 2018-04-27
CENT SOUTH UNIV
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[0005] The purpose of the present invention is to provide a wireless sensor network using a dynamic duty cycle to reduce the data transmission delay method to solve the problem of the existing constraints between the network delay and network life in existing protocols
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[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0029] figure 1 It is a schematic flow chart of the dynamic duty cycle adjustment (DDC) method provided by the present invention; that is, the method of the present invention adopts a larger duty cycle to nodes in the far base station area, and adopts the same previous strategy for nodes in the near base station area. Duty cycle, so as to achieve the purpose of shortening data transmission delay and improving energy usage efficiency without changing the network life.
[0030] see figure 1 , the DDC method provided by the present invention at least includes the following steps:
[0031]For any node at a distance of x meters from the base station, the duty cycle adopted by the node is shown in the following formula.
[0032]
[0033] in ν=(ι s +ι r )S p +(2ι s -ι t )S al +(ι s -ι r -ι t )S d ; ε represents the duty cycle adopted by the n...
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The invention discloses a method for reducing data transmission delay by adopting a dynamic duty cycle by a wireless sensor network. In data transmission of the wireless sensor network of periodic working and sleep alternate working modes, the main constitution of the data transmission delay is the sleep delay, that is, when a transmission data node needs to transmit data, the time for waiting fora relay node to wake up is required. The method of the invention adopts a smaller duty cycle in a near base station area, and a larger duty cycle in a remote base station area according to the characteristic that the energy consumption of the sensor network near a base station is high, and the energy consumption of the sensor network away from the base station is residual, therefore, the networkdata transmission delay can be greatly reduced on the premise that the network lifetime is not reduced. The innovation of the method is to break through the method of using the same duty cycle in theprevious strategy and accurately give the values of the duty cycles of different areas of the network, and compared with the previous strategy, the network delay is greatly reduced without reducing the network lifetime.
Description
technical field [0001] The invention belongs to the field of wireless network data transmission, and in particular relates to a method of how to select an appropriate duty ratio to minimize data transmission delay. Background technique [0002] A wireless sensor network is a wireless network composed of a large number of sensor nodes that communicate with each other through multi-hop wireless links and in a self-organizing and multi-hop manner. It can be widely used in industrial monitoring, agriculture, civil, environmental monitoring, battlefield , ocean, fire and other special environments and applications, it is considered to be one of the key basic technologies of the future important IoT network. An important application of wireless sensor network is data transmission, because it is of great significance to quickly transmit the information of sensor nodes to the base station. And delayed data transmission can lead to serious accidents. For example, in applications su...
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IPC IPC(8): H04W40/20H04W72/04H04W84/18
CPCH04W40/20H04W84/18H04W72/53
Inventor 刘安丰张琦胡艳玲
Owner CENT SOUTH UNIV