174 results about "Power control algorithm" patented technology

The present invention pertains to power control in cellular networks (1). A power control algorithm (201) is operated to control transmission powers on radio links (downlinks and/or uplinks). An information collector (203; 127) is adapted to collect power distribution information indicating how the transmission powers of a selected plurality of radio links are distributed in a dynamic power range extending from a minimum power level Pmin to a maximum power level Pmax. A feedback generator (205; 129) is adapted to generate feedback for modifying the operation of the power control algorithm (201) based on the power distribution information. The feedback makes the operation of the power control algorithm (201) less sensitive to initial settings of operational parameters and varying conditions in the radio environment. The burden on the operator to select optimal settings for operational parameters is therefore lowered. The invention can be achieved using conventional measurement reports from user terminals.

The invention provides a method and device for resisting interference in a wireless local area network. The method comprises the following steps that all APs are periodically polled, and the channel quality evaluation sheet of the current work channel of the currently-processed AP is acquired; whether the current work channel of the currently-processed AP reaches standards or not is judged according to the channel quality evaluation sheet; under the condition that the current work channel of the currently-processed AP does not reach the standards, whether the number of times of being substandard reaches a preset trigger threshold or not is judged; if the number of the times of being substandard reaches the preset trigger threshold, the automatic channel allocation algorithm of the currently-processed AP is triggered, and the work channel of the currently-processed AP is adjusted; if the number of the times of being substandard does not reach the preset trigger threshold, an interference source interfering the currently-processed AP is searched for, the power control algorithm of the interference source is triggered, and the power of the interference source is adjusted. According to the method and device, interference in the current wireless local area network is reduced, the overall performance of the wireless local area network is improved, the method and device can be applied to existing 802.11a/b/g/n and evolution versions following the 802.11a/b/g/n, and whole-network interference processing is achieved in a co-ordination mode.

The invention relates to a D2D (Device to Device) communication joint mode selection and proportional fairness resource scheduling optimization method. The invention aims to solve problems that most of the current literature is limited to the research for a single optimization problem of D2D communication mode selection or resource scheduling, and that the related research focuses on taking the maximum throughput as a resource scheduling objective and ignores the fairness between subscribers. The specific process comprises the steps of firstly calculating the channel gain; secondly, respectively calculating the signal to interference plus noise ratio, the instantaneous data rate, a proportional fairness function and the average transmission rate of each D2D subscriber and each cellular subscriber in a t-th time slot under a dedicated mode and a multiplexing mode; thirdly, acquiring a mathematical model for joint mode selection and proportional fairness scheduling; fourthly, solving an optimal control matrix p* by using an optical power control algorithm; and fifthly, performing D2D subscriber communication mode selection and resource scheduling under the multiplexing mode according to the optimal control matrix p*. The D2D communication joint mode selection and proportional fairness scheduling optimization method is applied to the field of D2D communication interference suppression.

The invention discloses a wireless sensor network rolling horizon signal-to-noise ratio estimation method with packet loss. The method comprises the following steps of: 1) obtaining a state space model of a wireless sensor network by use of a signal-to-noise ratio formula, a power control algorithm and a flow rate control algorithm; 2) modeling the packet loss into a random process of Bernoulli distribution according to the characteristics of packet loss to obtain a wireless sensor network model with packet loss; 3) transforming the rolling horizon signal-to-noise ratio estimation problem into an equivalent minimization problem according to the set rolling horizon window length N and the weight matrixes Pi, Q and R; and 4) solving the minimization problem based on a first-order optimization principle and a random method to obtain a wireless sensor network rolling horizon signal-to-noise ratio estimator, and obtaining the optimal estimated value and the predicted value of the next moment of the signal-to-noise ratio by the estimator. The method disclosed by the invention has a reasonable model and has functions of compensating packet loss and performing online calculation.