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Device for realizing wireless sensor network access protocol

A wireless sensor and network access technology, applied in wireless network protocols, wireless communication, transmission systems, etc., can solve problems such as increasing costs

Inactive Publication Date: 2009-09-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If it is all implemented in hardware, it will increase the cost

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  • Device for realizing wireless sensor network access protocol
  • Device for realizing wireless sensor network access protocol
  • Device for realizing wireless sensor network access protocol

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[0041] The CSMA-CA algorithm of the IEEE802.15.4 protocol is a channel contention algorithm used for inter-node data transmission. There are three important parameters in this algorithm: NB, CW and BE, NB, (number of backoffs, that is, the time unit for backoff is backoff The number of times); the initial value of NB is 0, when the device has data to transmit, after a period of back-off time, it will send CCA detection, if the channel is detected to be busy, it will randomly back up for a period of time, and the NB value is increased by 1, in 802.15.4 In , the maximum value of NB is defined as 4. When the channel is still detected as busy after 4 times of backoff delay time, the transmission is abandoned to avoid excessive overhead. CW, (the length of the collision window, content window length), that is, the length of the backoff delay time, the unit is backoff, and the definition of a backoff period is given by the parameter a Unit Backoff Period in the MAC parameter attribut...

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Abstract

The invention discloses a device for realizing a wireless sensor network access protocol. The channel contention mechanisms with different MAC protocols are mapped as the software programs inside a coprocessor, the reusability of the MAC can be enhanced by using the programmable flexibility of the coprocessor, the flexibility of the hardware is promoted, and the design cost of the hardware is reduced. The device comprises a sending part, a coprocessor part and a receiving part, wherein the coprocessor part comprises an interrupt flag register, a random number generator, a programmable MAC timer and a coprocessor; the coprocessor receives a signal from a CPU interface through an internal bus, the sending part, the receiving part and the interrupt flag register are controlled according to the generated control command, and the switching control between the receiving state and the sending state as well as the realization of the CSMA / CA algorithm are finished. The FPGA verification shows that the invention has simple design structure and small occupied area, can support the 20-250kbps communication rate, fully considers the feasibility of communication under the different wireless sensor network protocols and is especially suitable for the node chip of the wireless sensor network.

Description

technical field [0001] The invention belongs to the field of digital integrated circuits, and specifically relates to a device for implementing a wireless sensor network access protocol. The method is dedicated to the access protocol of the medium access control layer (MAC, Medium Access Control), and is especially suitable for carriers with collision avoidance The hardware implementation of CSMA-CA (carrier sence multiple access with collision avoidance) access protocol. Background technique [0002] With the rapid development of wireless communication technology, the wireless network technology based on it emerges as the times require. Wireless Sensor Network (WSN) is one of the outstanding representatives. WSN integrates the advantages of modern network technology, wireless communication technology, sensor technology, and embedded computing technology. Nodes use specific protocols to form networks and work together. They are widely used in military, environmental monitor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W80/06H04L29/06H04L1/00
Inventor 刘政林霍文捷郭文平艾金鹏刘政李元李子磊龚明杨万毓西
Owner HUAZHONG UNIV OF SCI & TECH
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