Sub-channel distribution method based on conflict threshold value limitation

An allocation method and sub-channel technology, which is applied in the field of sub-channel allocation based on conflict threshold restrictions, can solve problems such as sub-channel utilization is not optimal, system effective capacity is not optimal, etc., to increase effective throughput and reduce collision probability , maintain a stable effect

Active Publication Date: 2013-09-25
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, the utilization of sub-channels is not optimal, and the network environment is limited to the

Method used

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  • Sub-channel distribution method based on conflict threshold value limitation
  • Sub-channel distribution method based on conflict threshold value limitation
  • Sub-channel distribution method based on conflict threshold value limitation

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Embodiment Construction

[0023] A method for allocating sub-channels based on conflict threshold restrictions in the present invention will be described in detail below.

[0024] The network adopts a filling shared spectrum method. The whole system consists of a primary user, a cognitive base station and M secondary users, where M is a natural number. It is assumed that the licensed spectrum consists of N subchannels with a bandwidth of B, where N is a natural number, and the maximum transmission rate of the subchannels is C. For licensed spectrum, primary users have priority to use. The secondary user accesses the idle subchannel at the physical layer in OFDM mode.

[0025] Let the idle time length of sub-channel i obey the parameter λ i Exponential distribution of , i∈{1,2…N}, λ i >0, then the probability density function f of the subchannel i is in the idle state i (t) for

[0026] f i ( t ) = ...

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Abstract

The invention provides a sub-channel distribution method based on conflict threshold value limitation. According to the method, a concept of a conflict threshold value aiming at a distribution principle of a main user occupied authorized frequency spectrum and an authorized sub-channel idle state is introduced to analyze characteristics of self data packets and the idle state of a channel of a secondary user; access channels are selected as few as possible when the conflict threshold values are met, so that the possibility of the conflict of the secondary user and a main user is reduced. According to the sub-channel distribution method disclosed by the invention, the conflict threshold value is combined with an effective throughput capacity; sub-channels with the minimum quantity meeting self data requirements are selected according to the size of a sending data packet of each sub-channel and an idle possibility distribution parameter, so that more secondary users send out data, the conflict possibility of the main user is reduced, the effective throughput capacity of a network is increased, and the stability of a cognitive OFDM (Orthogonal Frequency Division Multiplexing) network is kept.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a method for allocating sub-channels based on conflict threshold restrictions. Background technique [0002] Wireless communication is developing in the direction of high speed and broadband, and the demand for spectrum resources is more urgent. The traditional fixed spectrum allocation method has the problem of low spectrum utilization. Cognitive radio allows cognitive users (ie, secondary users) to dynamically access the licensed spectrum of authorized users (ie, primary users), which can greatly improve spectrum utilization and effectively alleviate the problem of spectrum resource shortage. According to the way the secondary user accesses the network, the spectrum sharing technology can be divided into underlay and overlay. The sharing type means that the secondary user and the primary user share the same spectrum at the same time, provided that t...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04W72/04
Inventor 季薇王业胜
Owner NANJING UNIV OF POSTS & TELECOMM
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