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Rapid adaptive control method based on channel state run

An adaptive control and channel state technology, applied in wireless communication, electrical components, etc., can solve the problem that the distribution is not equal probability

Inactive Publication Date: 2015-10-21
NEIJIANG NORMAL UNIV
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Problems solved by technology

However, in the time-slotted ALOHA system, although the channel states are idle, successful transmission and collision, their distributions are not equiprobable.

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  • Rapid adaptive control method based on channel state run
  • Rapid adaptive control method based on channel state run
  • Rapid adaptive control method based on channel state run

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Embodiment Construction

[0146] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0147] The time-slotted ALOHA system adopts the p-persistence control algorithm, after the transmission of RW time slots, the probability of idle time slots in the update window is calculated. Then, the probability P'=P calculated by each network node according to formula (3) in the next update window 0 / ln(1 / P idle ) to send data. It can be seen from formula (3) that:

[0148] (i) when 1, ln(1 / P idle )→0, P' increases and tends to 1, but when P idle = 1, (3) formula is meaningless. In fact, when P idle = 1, the channel in the entire RW is idle, and the nodes do not transmit data. It can be known from formula (1) that N is very small and M is very large. That is, at a certain moment, the system node jumps from a large value to a small value.

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Abstract

The invention discloses a rapid adaptive control method based on channel state run. In combination with a pPCA (p Persistent Control Algorithm), the method comprises the following specific steps: initializing a system variable; judging whether or not mod(t, RW) is equal to 0; counting the quantity of current time slot transmission nodes; and performing rapid algorithm processing. In combination with a PBCA (pseudo-Bayesian Control Algorithm), the method comprises the following specific steps: transmitting a data packet; performing rapid adaptive algorithm processing; performing normal pseudo-Bayesian algorithm processing; transmitting a request packet; counting the quantity of idle time slots in one RW; and calculating Pidle. The rapid adaptive control method has the beneficial effects that the channel utilization ratio of a burst network environment in which the node quantity changes drastically can be increased remarkably. The conflict among the nodes can be relieved when communication nodes in a channel increase dramatically, so that the probability of successful node transmission is increased. Likewise, when the quantity of the communication data nodes in the system decreases suddenly, the transmitting probability of each node can be adjusted rapidly, so that the idleness rate of the channel is lowered, and the throughput of the whole system is increased.

Description

technical field [0001] The invention relates to the technical field of ultra-wideband wireless network and channel allocation, in particular to a fast self-adaptive control method based on channel state run. Background technique [0002] Slotted ALOHA needs to use a control algorithm to ensure the system to obtain a stable throughput, and the key to the control algorithm is to accurately estimate the number of nodes in the system. When the number of nodes in the system changes drastically at a certain moment, the traditional control algorithm has the problem of long adjustment time. [0003] Due to its simplicity, slotted ALOHA and its improved protocol have been widely used in satellite communication, GSM digital cellular network and tag identification, cognitive wireless network, vehicle network and underwater sensor network with long delay. However, the slotted ALOHA is inherently unstable, to solve the instability of the slotted ALOHA. The existing technology proposes ...

Claims

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Application Information

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IPC IPC(8): H04W74/08
CPCH04W74/0833
Inventor 方飞余文春
Owner NEIJIANG NORMAL UNIV
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