Wireless Access Devices Research Articles

Accelerating 5G QoE via public-private spectrum sharing

Fifth generation wireless systems (5G) must achieve high user Quality of Experience (QoE) in order to compete for market share. Each candidate 5G wireless radio frequency (RF) band offers advantages such as longer range or higher data rate than 2G, 3G, and 4G, but no single band or air interface standard by itself fully achieves ubiquitous levels of QoE for the complete range of wireless access devices. Spectrum clearing cannot keep pace with user demand, so public-private spectrum sharing is emerging as an affordable, near-term method of increasing radio access network (RAN) capacities for content delivery. This paper presents a fresh look at QoE; spectrum scarcity; public uses that underutilize candidate 5G radio frequency (RF) spectrum; and emerging public-private radio interference management frameworks that enable near-term spectrum sharing, with positive consequences for 5G price, performance, and total user QoE.

An Adaptive Power Saving Strategies based on Cross-layer Design in IEEE 802.16e

To enhance the power efficiency of broadband wireless access devices based on battery power, an adaptive power saving strategies based on cross-layer design i s proposed for IEEE 802.16e sleep-mode operation . In this paper, we evaluate performance of the power-saving mechanism based on sleep mode in IEEE 802.16e mobile Worldwide Interoperability for Microwave Access (WiMAX) system, which is based on time scheme to trigger transition from awake mode to sleep mode and a sleep window to next sleep window. After being idle for a period of time, a design time parameter to overcome the flaw of power efficiency drop with the short time sleep, mobile station switch to sleep mode for the first sleep interval defined by initial sleep window, which dynamically tune according to the statistical measurement of traffic load from physical layer . By analyzing the behaviors of a mobile station working in the sleep-mode operation with a Markov chain model and explori ng the relationship among traffic, energy consumption and mean delay of power saving mechanism based on cross-layer design , a heuristic algorithm is proposed to adapt the parameters of sleep -mode mechanism to the mobile station traffic and the mean delay requirement. Extensive simulation results show that the proposed algorithm outperforms the traditional power saving mechanisms in both the power consumption and the mean delay.