A multi-address access method based on channel sensing and prediction

An access method and channel sensing technology, which are applied in the field of multiple access based on channel sensing and prediction, and can solve problems such as low channel utilization efficiency.

Inactive Publication Date: 2008-08-13
ZHEJIANG UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The longer the unauthorized user (Secondary User, SU) occupies the channel, the greater the probability that it will collide with the authorized user; similarly, the longer the unauthenticated user backs off, although the conflict with the authorized user can be avoided, the The more transmission opportunities it loses, the less efficient its channel usage

Method used

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  • A multi-address access method based on channel sensing and prediction
  • A multi-address access method based on channel sensing and prediction
  • A multi-address access method based on channel sensing and prediction

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Embodiment Construction

[0054] The multiple access method based on channel perception and prediction is that unlicensed users can occupy the channel only when they perceive that the channel is idle, and the unlicensed users enter the transmission process, otherwise the unlicensed users have to monitor the channel all the time; during the transmission process, the unlicensed users Sensing the channel state while sending data, and according to the sensing results, the elapsed transmission time, the statistical rules of the channel occupied by authorized users, and the blocking probability constraints of authorized users, the channel state and state duration during the transmission process of unlicensed users prediction until the predicted channel state is that the channel is occupied by authorized users, and the unauthenticated users enter the backoff process; during the backoff process, the unauthenticated users only perceive the Statistical rules of the channel and the blocking probability constraints...

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Abstract

The invention discloses a multi access method based on channel sense and prediction. The method can self-adapting adjusts transmission time and backoff time of non-authorized user based on statistical law of authorized user busy channel. By using a modified carrier sense multi access arithmetic, the non-authorized user carries out a prediction on a frequency spectrum state and a state residual duration based on a present sensing time, a present time slot duration, the statistical law of authorized user busy channel and a blocking probability restrict of authorized user. Further, the invention provides a recursive parameter estimation method for avoiding a long-term observation to a non-authorized user required before frequency range is used. The method can increase a service efficiency of the channel under the premise of ensuring the blocking probability restrict of authorized user.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a multiple access method based on channel perception and prediction. Background technique [0002] As a new type of intelligent wireless transmission technology, cognitive radio (CR) can adaptively adjust transmission parameters by sensing the surrounding wireless transmission characteristics, effectively solving the problem of scarcity of spectrum resources. Traditional channel sense multiple access methods include CSMA (Carrier Sense Multiple Access) and its derivatives, such as CSMA / CD (Carrier Sense Collision Detection), CSMA / CA (Carrier Sense Collision Avoidance), and so on. The basic idea of ​​this type of algorithm is: when the user wants to send data, first listen to the channel, if the channel is idle, the user can transmit, otherwise, keep listening until the channel is free and then transmit immediately; if the user is transmitting When a collision is detected, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/413
Inventor 张朝阳王培雅
Owner ZHEJIANG UNIV
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