A Distributed Access Control Method Applicable to Cognitive Wireless Networks

Abstract

The invention belongs to the technical field of communication, and in particular relates to an access control protocol design suitable for a multi-channel cognitive wireless network. The present invention aims at various defects existing in the existing cognitive wireless network access control mechanisms based on the perception-reservation mode and the reservation-awareness mode, and designs a new cognitive wireless network based on a dedicated control channel based on the reservation-awareness mode. Network access control mechanism. Compared with the prior art, the access control mechanism proposed in the present invention needs to be able to better avoid interference to the communication of the hidden primary user and more fully utilize the time-frequency resources of the dedicated control channel and other unreserved data channels for identification. know data transmission. At the same time, compared with the prior art, the access control mechanism proposed in the present invention needs to be able to achieve better data channel utilization efficiency and network data transmission throughput.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to an access control protocol design suitable for a multi-channel cognitive wireless network. Background technique [0002] With the rapid development of wireless communication technology, limited spectrum resources have become an urgent problem restricting the development of wireless communication. As an important technical means to solve the increasingly tight spectrum resources, cognitive radio technology can enable cognitive user nodes to opportunistically access to the communication frequency band that has been authorized to the primary user and is in an idle state, without affecting the communication of the primary user. It can effectively improve the utilization of limited spectrum resources and promote the integration of heterogeneous networks. [0003] In a cognitive wireless network composed of multiple cognitive nodes, any two adjacent cognitive nodes n...

AI Technical Summary

Problems solved by technology

Among them, compared with the reservation-sensing mode, the sensing-reservation mode usually leads to a longer delay between the spectrum sensing of the reserved data channels by the cognitive transmitting and receiving nodes and the transmission of cognitive data based on these data channels, so that it cannot be updated. Well adapted to the dynamic occupancy of the data channel by the primary user

On the other hand, compared with the perception-reservation mode, the reservation-awareness mode makes it easier for the cognitive transceiver node to reserve the data channel being occupied by the primary user, so it is more likely to fail the data channel reservation

[0008] In addition, the existing access control mechanism based on the reservation-sensing mode has the following two disadvantages: First, as long as the local spectrum sensing of the cognitive transceiver nodes detects that the reserved data channel is not occupied by the primary user, they will Cognitive data transmitted on the data channel

However, due to the limitations of existing local spectrum sensing methods, such as energy detection, matched filter, cyclic spectrum, and wavelet detection, there may be hidden primary users that are not perceived by cognitive transceiver nodes, while cognitive transceiver nodes The data transmission between nodes may interfere with the communication of the hidden primary user

Second, when a pair of cognitive transceiver nodes successfully reserves a group of data channels, they need to finish the data transmission process on the data channel before they can start to exchange control information again, and this waiting mechanism limits the Improve the data transmission efficiency of the sending and receiving nodes

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