Cognitive radio system based on relay cooperative transmission and resource allocation method thereof

Abstract

The invention relates to a cognitive radio system based on relay cooperation transmission and a resource allocation method thereof. The system comprises a cognitive base station and a plurality of cognitive terminals, wherein the cognitive base station comprises a base station environment cognitive module, a cognitive information library, a wireless resource allocation module and a base station reconfiguration management module; and the cognitive terminal comprises a business state module, a terminal environment cognitive module and a terminal reconfiguration management. The system and the method of the invention takes satisfaction of QoS demands from users and maximization of effective throughput of the system as targets, further has practical meaning, and meets experience requirements of the users. The policies on relay and transmission path selection, frequency spectrum allocation, transmission rate control and other wireless resource allocation are determined based on various useful cognitive information of the system, thereby solving the problem of the wireless resource allocation in the cognitive radio system based on the relay cooperation transmission, optimizing system performance and improving utilization rate of system frequency spectrum.

Description

technical field [0001] The present invention relates to the field of cognitive radio technology, in particular to a cognitive radio system based on relay cooperative transmission and a resource allocation method thereof. Background technique [0002] In recent years, cognitive radio has been considered as an effective means to promote efficient use of spectrum. However, because the secondary users can only opportunistically use the spectrum holes not occupied by the primary users, and the spectrum usage conditions of the primary users distributed in different geographical locations are different, so in the cognitive radio system, the spectrum availability has different stable characteristics, and the distribution of the available spectrum can also be quite uneven. At the same time, user service types and requirements are diverse, which means that there may be a situation where the available spectrum resources of a cognitive user do not match its service requirements very mu...

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Problems solved by technology

[0007] However, this method only selects the most appropriate relay node for "potential targets" (cognitive terminals that have not yet met the QoS requirements) as much as possible, and does not aim at guaranteeing the QoS of cognitive users, so it cannot guarantee the QoS of cognitive users. Satisfaction of QoS

At the same time, each cognitive terminal set in this system has at most one terminal node to provide relay transmission for it, and each cognitive terminal selected as a relay also provides at most one other user with relay assistance, making the system inflexible and convenient To provide transmission resources with sufficient capacity for users who have not yet met the QoS requirements, it also limits the increase of the effective throughput of the system and the improvement of spectrum utilization

[0008] Most of the systems in the prior art start from the perspective of simply improving the system capacity, without or less consideration of the impact of the user's QoS requirements, and thus cannot fully guarantee the system's satisfaction with the cognitive user's QoS

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