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Selective Cognitive Access Method Based on Channel Quality

An access method and channel quality technology, applied in the field of selective cognitive access based on channel quality, can solve problems such as low efficiency of spectrum use

Active Publication Date: 2017-02-08
北京凯华信业科贸有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this greedy spectrum usage method greatly improves the utilization rate of the spectrum, there is a problem of low spectrum utilization efficiency

Method used

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  • Selective Cognitive Access Method Based on Channel Quality
  • Selective Cognitive Access Method Based on Channel Quality
  • Selective Cognitive Access Method Based on Channel Quality

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Such as Figure 5 As shown, the present invention provides a selective cognitive access method based on channel quality, comprising the following steps:

[0063] S1, for a cognitive radio system containing N channels, where the set of channels is denoted as {c 1 ,c 2 ,...,c N}; Get the optimal threshold of the cognitive radio system

[0064] The optimal threshold for this cognitive radio system Get it by:

[0065] S1-1. Obtain an initial parameter value of the cognitive radio system; the initial parameter value includes:

[0066] a) Distribution function F of channel idle duration i (·), the distribution function F of channel occupancy duration b (·), channel idle duration expected value α and channel occupied duration expected value β;

[0067] b) The maximum Doppler frequency shift f of nodes in the cognitive radio system d ;

[0068] c) channel average signal-to-noise ratio γ 0 ;

[0069] d) The transmission rate levels {0, 1, ..., K-1} supported by th...

Embodiment 2

[0107] This embodiment is basically the same as Embodiment 1, and the only difference lies in the sequential channel sensing and the implementation manner of synchronization between the cognitive terminal and the receiving terminal during detection.

[0108] Consider a cognitive radio system including N non-overlapping channels, assuming that each pair of cognitive terminal and receiving terminal can only perceive, detect or use one channel at a time. The set of channels is denoted as {c 1 ,c 2 ,...,c N}. It is assumed that the channels all have equal bandwidth BHz. The channel state is jointly described by channel availability and link quality, where the sequential channel sensing and detection mechanism can be described as:

[0109] 1-1) Control channel handshake interaction:

[0110] When a cognitive terminal needs to send data, it first transmits an RTS data packet on the control channel. The control channel can be a dedicated physical channel or a logical dedicated ...

Embodiment 3

[0118] A specific embodiment of the channel quality-based selective cognitive access method provided by the present invention is introduced below. It should be emphasized that in this embodiment, the parameter setting does not affect the generality.

[0119] The basic parameters of this embodiment are set with reference to a typical cognitive radio frequency band, that is, a TV frequency band. The specific parameters are shown in the table below:

[0120]

[0121]

[0122] The center frequency of the frequency band is set to 500MHz, and the bandwidth of each channel is 6MHz. Average Received Signal-to-Noise Ratio γ 0 Set to a typical value of 10dB. The actual sensing time is related to specific system requirements and hardware components. For example, in the 802.22 protocol, the sensing time varies from 0.8ms to 24.2ms according to different applications or sensing technologies. In this embodiment, it is considered that the sensing time is 10 ms. The channel sounding...

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Abstract

The invention provides a selective cognitive access method on the basis of the quality of channels. The selective cognitive access method includes steps of acquiring the optimal threshold of a cognitive radio system; enabling a cognitive terminal to sequentially perceive and detect the various channels when the cognitive terminal needs to transmit data, and judging whether the real-time state of a detected channel Ci meets conditions or not; enabling the cognitive terminal to access the channel Ci if the real-time state of the channel Ci meets the conditions; sequentially transmitting the data via the channel Ci; enabling the cognitive terminal to monitor the real-time state of the channel Ci; enabling the cognitive terminal to instantly release the current channel Ci if the cognitive terminal detects that the real-time state of the channel Ci is lower than or equal to the optimal threshold; and perceiving and detecting the channels again. The conditions include that the channel Ci is an idle channel, and the link quality of the channel Ci is superior to the optimal threshold. The selective cognitive access method has the advantages that a channel access and release decision is made for the cognitive terminal under joint consideration of the availability and the instantaneous link quality of the channels, and the frequency spectrum utilization efficiency can be greatly improved.

Description

technical field [0001] The invention belongs to the field of cognitive radio in wireless communication technology, and in particular relates to a selective cognitive access method based on channel quality. Background technique [0002] Spectrum is the medium through which wireless signals are transmitted. For a long time, in order to ensure that various wireless services and networks can coexist without interference in the free propagation space, the spectrum allocation method is a simple static allocation method, that is, the spectrum management department divides the available spectrum resources into several non-overlapping fixed frequency bands , and then allocate the divided fixed frequency bands to various services and technologies, and users who are qualified to use frequencies are usually called authorized users or primary users. [0003] In the initial stage of wireless communication development, people's total demand for wireless services is small. Therefore, the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/00
Inventor 李柏文刘怡静杨磊杨盘隆刘云浩
Owner 北京凯华信业科贸有限责任公司
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