Hybrid WOA-BAT Optimization for Performance Enhancement of Coexisting WBANs

The presence of multiple WBANs in any location leads to co-existence issues as multiple users occupy the same channel at the same time. In a real scenario due to mobility the co-existence issues arise intermittently depending on the closeness of the mobile WBAN and other static/mobile WBANs. Since WBAN’s are used for monitoring the vital parameters of the human body, the performance of the system consisting of multiple WBANs gets affected whenever co-existence issues arise. Existing work deals with interference issues that arise in Intra WBAN communication. Very limited work is present in literature dealing with coexistence issues that arise from Inter WBAN interference due to varying mobility. In this work we evaluate the performance of the system consisting of static/mobile WBANs subject to interference under varying mobility of other WBANs passing by, thereby creating Body to Body Networks for random, intermittent time durations depending on the speed of the mobile WBANs. We consider two cases, a park area with surrounding paths and an old age home located on a roadside with passersby. We propose an optimization technique using WOA to determine closeness between the WBANs and evaluate the performance of the system. We also consider the case of the impact of passer-by WBAN mobility on static WBANs (elderly occupants of an old age home) and develop a hybrid WOABAT approach to determine the optimal positions for the static WBANs such that the entire system performance is optimized.

A Review on Coexistence Issues of Broadband Millimeter-Wave Communications

<div>With higher frequencies and broader spectrum than conventional frequency bands, the millimeter-wave (mmWave) band is suitable for next-generation wireless networks featuring short-distance high-rate communications. As a newcomer, mmWaves are expected to have the backward compatibility with existing services and collaborate with other technologies in order to enhance system performances. Therefore, the coexistence issues become an essential topic for next-generation wireless communications. In this paper, we systematically review the coexistence issues of broadband mmWave communications and their corresponding solutions proposed in the literature, helping shed light on the insights of the mmWave design. Particularly, the works surveyed in this paper can be classified into four categories: coexistence with microwave communications, coexistence with fixed services, coexistence with non-orthogonal multiple access (NOMA), and other coexistence issues. Results of numerical evaluations inspired by the literature are presented for a deeper analysis. We also point out some challenges and future directions for each category as a roadmap to further investigate the coexistence issues of broadband mmWave communications.</div>

A Review on Coexistence Issues of Broadband Millimeter-Wave Communications

<div>With higher frequencies and broader spectrum than conventional frequency bands, the millimeter-wave (mmWave) band is suitable for next-generation wireless networks featuring short-distance high-rate communications. As a newcomer, mmWaves are expected to have the backward compatibility with existing services and collaborate with other technologies in order to enhance system performances. Therefore, the coexistence issues become an essential topic for next-generation wireless communications. In this paper, we systematically review the coexistence issues of broadband mmWave communications and their corresponding solutions proposed in the literature, helping shed light on the insights of the mmWave design. Particularly, the works surveyed in this paper can be classified into four categories: coexistence with microwave communications, coexistence with fixed services, coexistence with non-orthogonal multiple access (NOMA), and other coexistence issues. Results of numerical evaluations inspired by the literature are presented for a deeper analysis. We also point out some challenges and future directions for each category as a roadmap to further investigate the coexistence issues of broadband mmWave communications.</div>