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CSMA/CA delay optimization method in the mechanism of multi-packet reception

A multi-packet reception and optimization method technology, applied in wireless communication, electrical components, etc., can solve conflicts, not suitable for asynchronous access channel access, regardless of whether the channel state is idle, etc., to achieve the effect of reducing back-off delay

Inactive Publication Date: 2016-07-13
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0005] Different from the channel access mechanism of the IEEE802.11 network, the IEEE802.15.4 network only backs off according to the randomly selected back-off window in the back-off competition, regardless of whether the channel status is idle or not. After the back-off, the channel idleness evaluation must be performed twice to avoid The collision between the data packet and the ACK response frame, so the IEEE802.15.4 network is not suitable for directly using the asynchronous access method to access the channel

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[0025] Combine below figure 1 and specific embodiments to further clarify the present invention, it should be understood that after reading the present invention, modifications to various equivalent forms of the present invention by those skilled in the art all fall within the scope defined by the appended claims of the present application.

[0026] The present invention is a delay optimization method of IEEE802.15.4CSMA / CA under a multi-packet receiving mechanism. CSMA / CA is a time slot type, including basic backoff parameters BE, NB and CW. The initial value of BE is 3, and the initial value of NB is 0. The initial value of CW is 2, the multi-packet receiving capability value is γ, CCA detects that the current channel is busy, and there is data communication in the channel, the node trying to access the channel needs to continue to back off, and the node trying to access the channel needs to keep backing off according to different CCA As a result, adjust the backoff paramete...

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Abstract

The present invention provides a CSMA / CA delay optimization method in the mechanism of multi-packet reception. The method comprises: on the basis of back-off parameters and multi-package receiving capability value [Gamma], nodes trying to access a channel are configured to regulate back-off parameters according to different CCA results to perform the next time back off when the CCA detects that the present channel is busy. The CSMA / CA delay optimization method in the mechanism of multi-packet reception is able to improve the delay performance of IEEE802.15.4CSMA / CA in the mechanism of multi-packet reception while avoiding increasing of the packet loss probability of data packages.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a CSMA / CA delay optimization method under a multi-packet receiving mechanism. Background technique [0002] CSMA / CA is a contention-based channel access algorithm. There are three basic parameters in this mechanism: Backoff Exponent (BE), Number of Backoff Periods (Number of BackoffPeriods, NB) and Contention Window (ContentionWindow, CW). The contention window size determines the number of channel idle status evaluations at the end of each backoff, and the default value is 2. The backoff index specifies that every time from [0, 2 BE -1], choose a random backoff value, and execute the backoff waiting time before accessing the channel. In time slot CSMA / CA, the selection of the initial value of BE needs to judge whether the field of the power saving mode is 0, and BE=2 in the power saving mode, otherwise the default value of BE is 3. The initial value of the numb...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08
CPCH04W74/0816H04W74/085H04W74/0883H04W74/0891
Inventor 张一晋罗琳琳魏俊张茗房玉轩周远达桂林卿
Owner NANJING UNIV OF SCI & TECH