This paper proposes a novel rate-adaptation scheme, called CARA (Collision-Aware Rate Adaptation), which combines adaptively the Request-to-Send/Clear- to-Send (RTS/CTS) exchange with the Clear Channel Assessment (CCA) functionality to differentiate frame collisions from frame transmission failures caused by channel errors.
In-depth simulation shows that the proposed MPDU-based link adaptation scheme outperforms the single-mode schemes and the autorate fallback (ARF) scheme-which is used in Lucent Technologies' WaveLAN-II networking devices-significantly in terms of the average goodput, the frame drop rate, and the average number of transmission attempts per data frame delivery.
This work proposes a priority-based fair medium access control protocol by modifying the distributed coordination function (DCF) of the IEEE 802.11 MAC, and approximations to the optimal contention window sizes, which are based on a theoretical analysis, are evaluated numerically and shown to work well under different network configurations and traffic scenarios.
It is claimed that link adaptation, which performs both dynamic fragmentation and PHY rate selection depending on the wireless channel condition between the transmitter and receiver, is an attractive way to improve the goodput performance of an IEEE 802.11a wireless LAN.
This paper proposes a novel scheme, called MiSer, that minimizes the communication energy consumption in 802.11a/h systems by combining TPC with PHY rate adaptation, and results show that MiSer delivers about 20% more data per unit of energy consumption than the PHy rate adaptation scheme without TPC, while outperforming single-rate TPC schemes significantly thanks to the excellent energy-saving capability of PHY rates adaptation.
Experimental and simulation results demonstrate that the proposed system can utilize the wireless charging technology effectively to prolong the network lifetime through delivering energy by a robot to where it is needed.
From the evaluation results, it is observed that significant energy savings can be achieved by combining TPC with adaptive PHY rate selection, and a novel scheme for accurate path loss estimation in 802.11 WLAN is presented.
A smart PSM (SPSM) scheme, which directs a wireless station to sleep/wake up according to an "optimal" sequence, such that the desired delay performance is guaranteed with minimum energy consumption, and is more flexible than BSD in the sense of being able to meet arbitrary user-desired delay requirement.
J-RoC — a practical and efficient Joint Routing and Charging scheme that significantly elongates the network lifetime compared to existing wireless charging based schemes and effectively improves the network energy utilization.
A totally new approach toward simple but accurate derivations is developed for the power-saving operation in Third-Generation Partnership Project (3GPP) Long-Term Evolution Advanced (LTE Advanced) wireless networks to avoid sophisticated steps while reaching an accurate analytical model.