In the paper, we investigate the delay-aware data transmission in renewable energy aided multi-carrier system. Besides utilizing the local renewables, the transmitter can also purchase grid power. By scheduling the amount of transmitted data (The data are stored in a buffer before transmission), the sub-carrier allocation, and the renewable allocation in each transmission period, the transmitte...

Mobile enable Wireless Sensor Network (mWSN) has been proposed to realize large-scale information gathering via networking wireless sensors and mobile sinks. Some fundamental design parameters in mWSN have been investigated in this article, such as cluster size, sink velocity, transmission range, and packet length. Our contributions include: 1) We propose to use multihop forwarding to form a cl...

In this paper, we propose a new EIFS strategy to improve the performance in IEEE 802.11. In IEEE 802.11 specifications, the EIFS time delay is activated after a node initiates an unsuccessful transmission. The new EIFS strategy uses the same activation mechanism as the specifications. The major difference between the standard EIFS and the new EIFS strategy is when to deactivate such time delay....

We investigate the performance of handoff policies for data services and voice services in a DS-CDMA system with respect to delay sensitivity. A slotted ALOHA random access scheme on the reverse link is employed to support data services. A soft handoff policy, hard handoff policy and restricted-transmission policy for data packets in a soft handoff region are compared in terms of throughput, sy...

A Mobile computer changes its location from time to time. Wireless communication protocols, e.g. IEEE802.11 and HIPERLAN, are widely available in mobile ad-hoc networks. By controlling signal transmission power in a mobile computer, transmission range of the signal is changed. By increasing the signal transmission power, the number of hops for transmitting a message between two mobile computers...

The quality of service (QoS) requirements are usually different from user to user in a multiaccess system, and it is necessary to take the different requirements into account when allocating the shared resources of the system. In this paper, we consider one QoS criterion–delay in a multiaccess system, and we combine information theory and queueing theory in an attempt to analyze whether a multi...

INTRODUCTION To understand better the risk of tuberculosis transmission with increasing delay in tuberculosis treatment, we undertook a retrospective cohort study in Shenzhen, China. METHODS All pulmonary tuberculosis cases in the Shenzhen tuberculosis surveillance database from 1993-2010 were included. Sputum smear positivity and presence of pulmonary cavity were used as proxies for risk of ...

In fields such as mobile communications, video, and finance, the Precision Time Protocol (PTP) is an effective method for achieving highly accurate time synchronization. However, PTP profiles differ depending on field in which used, synchronization not possible between different profiles. Therefore, when telecommunication carriers distribute to each field, networks are required profile, resulti...