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Multiuser access is a critical issue in distributed cognitive radio networks (DCRNs), as the collisions among the competing secondary users (SUs) may decrease the network throughput significantly. In order to reduce the collisions, we propose a dynamic backoff algorithm to find an optimal backoff contention window to maximize the network throughput and reduce the channel access delay. Based on the...
Flooding broadcast is the main way of vehicular node forwarding packets in Vehicular ad-hoc network (VANET). However this way may cause network congestion especially when multiple broadcast nodes send packets to the same receiving node at the same time. In this paper, a Congestion-Aware GPCR Routing Protocol (CA-GPCR) has been proposed to improve the performance of GPCR routing protocol in urban scenarios...
Aiming at dynamic changes of network topology, high real-time security services and high network load in VANETs, this paper proposes an adaptive TDMA slot allocation strategy based on beacon messages (BMA strategy). BMA strategy makes full use of neighbor nodes' beacon messages, including vehicular direction, position, velocity, etc. Meanwhile, each vehicle establishes neighbor table containing beacon...
In order to handle the low efficiency problem caused by an extremely uneven distribution of users for LTE/LTE-A network, we propose a contention based Fractional Frequency reuse scheme. Simulation results show that the proposed scheme not only greatly improves the performance of the edge users but also improve the throughput of the whole network. This method demonstrates potential for applicability...
Long Term Evolution (LTE) is a main mobile communication technology in the future. For the reason that different kinds of multimedia applications have different quality of service (QoS) requirements, especially for Real Time (RT) traffics, it is necessary to design an effective scheduling algorithm to satisfy the various kinds of QoS needs. In this paper we propose a new scheduling algorithm named...
In order to handle the cross-tier and co-tier interference effectively for LTE-A two-tier heterogeneous network, we propose a CSGC algorithm based partial spectrum sharing scheme using cognitive radio (CR) technique. In this paper, Radio resources are divided into three parts: macro-dedicated part, shared part and femto-dedicated part. Simulation result shows that the proposed scheme not only solves...
Combine with time reversal (TR) technique, a method for enhancing power collection efficiency of long-distance wireless power transmission (WPT) is proposed. In the condition of non-line of sight (NLOS) and transmission distance of 15m (d=15m), compared with the WPT directly, the received average power of WPT using TR technique is enhanced more than one order without increasing the complexity of transceivers...
In order to handle the cross-tier interference problem and improve the throughput of a long-term evolution advanced (LTE-A) heterogeneous network, we propose a downlink partial spectrum sharing scheme using cognitive radio (CR) technique. In this paper, radio resources are divided into three parts: macro-dedicated portion, shared portion and femto-dedicated portion. Moreover, we propose a mixed sharing...
This paper proposes a roadside unit (RSU)-coordinated synchronous multi-channel medium access control (MAC) scheme for vehicular ad hoc networks (VANETs). The proposed scheme allows the on board unit (OBU) to reserve service channels (SCHs) on the control channel (CCH) during almost the whole synchronous interval and supports simultaneous transmissions on different SCHs. It enhances the performance...
RFID technology is gaining much attention for indoor localization because of its advantages such as non-contact and non-line-of-sight nature. In this paper, we study two typical approaches using active RFID for indoor location sensing: LANDMARC and VIRE, and point out that the latter approach with a fixed threshold of received signal strength indication (RSSI) difference which determines the elimination...
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