Cognitive radio network spectrum allocation method of channel duration

Abstract

The invention belongs to the field of cognitive radio technology, and discloses a cognitive radio network spectrum allocation method of a channel duration. The method comprises the following steps: initializing a system and a matrix to obtain an interference matrix C, a channel available matrix L and a channel available probability matrix P corresponding to the channel available matrix L, and initializing an allocation matrix A into a zero matrix; calculating the mark of each node n according to a marking rule; selecting the node n with the maximum marking value, selecting a marking value with a smaller interference neighbor number according to the same maximum marking value, and coloring the node n by using a color corresponding to the mark; updating the topology: deleting an available color list in the node n, and meanwhile deleting the color m from the available color list in the neighbor node generating mutual interference with the node n; and judging whether the nodes are completely colored or whether the available color list in the node is empty. By adoption of the cognitive radio network spectrum allocation method, the duration of the spectrum allocation result in CRN is prolonged; and the duration of the spectrum allocation in the CRN is prolonged.

Description

technical field [0001] The invention belongs to the technical field of cognitive radio, and in particular relates to a method for allocating frequency spectrum of a cognitive radio network with channel duration. Background technique [0002] Wireless technology promotes the progress of various wireless applications and devices, which not only increases the usage of spectrum resources exponentially, but also makes spectrum resources more scarce; meanwhile, spectrum resources cannot meet the growing demand. The concept of cognitive radio can improve spectrum utilization efficiency and reduce spectrum waste. The FCC has also allowed service providers to open up TV broadcasting frequencies to unauthorized users, such as WLAN and WiFi. In 2004, IEEE announced the first wireless network standard—IEEE 802.22 protocol standard. The entire CR network includes primary users and secondary users. Primary users are also called authorized users and have their own licensed spectrum. Seco...

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Problems solved by technology

[0003] To sum up, the problem existing in the prior art is that the Cognitive Radio Network (CRN) is composed of Primary User (PU) and Secondary User (SU). The interruption or delay of communication, in the process of spectrum allocation, does not consider the available duration of the channel to the secondary user, which will cause the user to use this channel when the available probability and available duration of a channel are very low. Due to insufficient transmission time during transmission, network packet loss or delay is caused, and this will also cause the entire CRN to continuously allocate spectrum, making the entire CRN not very stable and reliable

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