Adaptive carrier sense multiple access (CSMA)/conditional access (CA) method based on institute of electrical and electronics engineers (IEEE)802.15.4

An access method and self-adaptive technology, applied in the field of CSMA/CA access mechanism optimization, can solve problems such as waste of time and channel resources, message collision, network throughput decline, etc.

Active Publication Date: 2012-07-18
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

When the next algorithm starts, BE restores the default value, and the nodes are very likely to collide again and retransmit data packets until BE reaches a higher value again,

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  • Adaptive carrier sense multiple access (CSMA)/conditional access (CA) method based on institute of electrical and electronics engineers (IEEE)802.15.4
  • Adaptive carrier sense multiple access (CSMA)/conditional access (CA) method based on institute of electrical and electronics engineers (IEEE)802.15.4
  • Adaptive carrier sense multiple access (CSMA)/conditional access (CA) method based on institute of electrical and electronics engineers (IEEE)802.15.4

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[0031] The adaptive CSMA / CA access method based on IEEE802.15.4 proposed by the present invention is divided into an analysis phase, a decision phase and an execution phase. The analysis phase and the decision phase are executed in the network coordinator, and the execution phase is executed in the ordinary nodes with data transmission.

[0032] Group I (Group-1): Store the nodes whose macMinBE is reduced by 1 in this group. Compared with other nodes, these nodes occupy less network traffic.

[0033] Group Ⅱ (Group-2): Store the nodes that macMinBE performs plus 1 operation in this group. These nodes occupy relatively large network traffic. When a node in Group-2 transmits at least PKT_DIFFERENCE more data packets than a node in Group-1, the ABE-BEB decision phase will be executed. Otherwise, the next analysis cycle will proceed.

[0034] PKT_DIFFERENCE: It is the decisive factor in the implementation of the decision-making phase. If the first node in Group-2 sends at least PKT_...

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Abstract

The invention relates to a carrier sense multiple access (CSMA)/conditional access (CA) mechanism optimization method in a new institute of electrical and electronics engineers (IEEE)802.15.4 standard. An analysis stage, a determination stage and an execution stage are involved. An initial value of macMinBE in the CSMA/CA is retained, but the backoff index macMinBE is dynamically adjusted according to contention network flow of each node in a certain number of beacon frame intervals, so that a proper backoff range can be dynamically selected by a sensor node according to the condition of a network. Due to optimization, macMinBE can reflect the current network condition accurately, and network use rights among the nodes are balanced. Therefore, the network justice of the nodes is improved, the network throughput is increased, and the network load is reduced. A simulation result shows that: compared with the conventional binary exponential backoff (BEB) algorithm in the IEEE802.15.4, the optimization method for a BEB algorithm with adaptive adjustment capacity has the advantage that under the condition that the network input service amount is relatively large, the network throughput is increased obviously, and the network working load is reduced.

Description

Technical field [0001] The invention relates to a wireless sensor network media access control (MAC, Media Access Control) sub-layer processing technology, in particular to a new CSMA / CA access mechanism optimization method in the IEEE802.15.4 standard. Background technique [0002] Wireless Sensor Network (WSN, Wireless Sensor Network) is a data-centric network. A large number of sensor nodes with wireless communication and data processing capabilities form a wireless network in a self-organizing or multi-hop manner. Nodes collect and process data through sensors and feed back to users. [0003] The IEEE802.15.4 standard is mainly aimed at low-speed, low-power, low-cost low-speed wireless personal area network (LR-WPAN, Low Rate-Wireless Personal Area Network), which defines the protocol of the physical layer and the data link layer. It is very suitable for WSN. At present, many WSN researches are based on this protocol standard. The IEEE802.15.4 protocol provides two working mo...

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Application Information

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IPC IPC(8): H04W80/00H04W84/18
Inventor 龙昭华苏美君李景中蒋贵全刘达明张林
Owner CHONGQING UNIV OF POSTS & TELECOMM
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