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Down link space-time scheduling method of cognitive cellular network

A technology of downlink and scheduling method, applied in the direction of space transmit diversity, electrical components, diversity/multi-antenna system, etc., which can solve the problems of low utilization rate and so on

Active Publication Date: 2015-04-22
CHINA INFOMRAITON CONSULTING & DESIGNING INST CO LTD
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Problems solved by technology

On the other hand, actual measurements show that most of the allocated spectrum is underutilized

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  • Down link space-time scheduling method of cognitive cellular network
  • Down link space-time scheduling method of cognitive cellular network
  • Down link space-time scheduling method of cognitive cellular network

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[0087] In order to verify the performance of the ACO-based user selection method proposed in the present invention, the system obtained by it with the optimal method-exhaustive search (Brute Force Search) and another widely used suboptimal method-greedy method is compared below capacity. In order to avoid interference to PUs, the above three methods all use the dual orthogonal transmission spatial multiplexing technology proposed in the present invention. Exhaustive search compares all n in N CMS T - The system capacity obtained by the combination of M CMSs, the combination corresponding to the maximum value is selected. The greedy method compares the channel quality between CBS and all CMSs, and selects the best top n T - M accesses, which are widely used in commercial communication systems, such as 3G1X and Qualcomm HDR.

[0088] Figure 3a ~ Figure 3c Shown is the real-time system capacity obtained by the above three methods under different PU numbers, where Figure 3a...

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Abstract

The invention discloses a down link space-time scheduling method of a cognitive cellular network. The method comprises the following steps of: step (1), collecting a channel state information vector between a multi-antenna cognitive base station and a single-antenna cognitive mobile terminal, and a channel state information vector between the cognitive base station and a single-antenna master user; step (2), initiating pheromones distributed on each side of a construction graph and heuristic information; step (3), generating an artificial ant; step (4), by virtue of the cognitive base station, calculating a double orthogonal wave beam shaping vector corresponding to the cognitive mobile terminal; step (5), allocating sending power to a data stream sent by the cognitive base station to the cognitive mobile terminal; step (6), determining whether a preset maximal number of iteration times is reached, and if so, stopping and outputting a optimal access set, wherein the maximal number of iteration times is a natural number; and step (7), updating pheromones distributed on all sides in the construction graph and returning to the step (3); and thus completing the down link space-time scheduling.

Description

technical field [0001] The invention relates to the technical field of wireless communication and communication signal processing in cognitive radio technology, in particular to a downlink space-time scheduling method of a cognitive cellular network based on cognitive radio. Background technique [0002] With the continuous growth of wireless services and applications, available wireless spectrum resources are becoming more and more scarce. At present, the lack of available spectrum has greatly hindered the sustainable development of wireless communication. On the other hand, actual measurements show that most of the allocated spectrum is underutilized. In this context, cognitive radio (Cognitive Radio, CR) technology emerges as the times require. The CR network shares the PU licensed spectrum in time and space by co-existing with the Primary User (PU) network that holds the licensed spectrum. Therefore, the utilization rate of the existing licensed spectrum can be improve...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/12H04B7/06
Inventor 魏飞夏鹏瑞张燕
Owner CHINA INFOMRAITON CONSULTING & DESIGNING INST CO LTD
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