Tharek Abd RAHMAN, Jamal NASIR, Nour HINDIA, Ahmed Mohammed AL-SAMMAN

Path loss model for indoor emergency stairwell environment at millimeter wave band for 5G network

The unused millimeter-wave (mmWave) spectrum offers a superb opportunity to increase mobile broadbandcapacity due to the enormous amount of available bandwidth. Different candidate operating frequencies for 5G wirelessnetworks are available at the mmWave band. For 5G wireless networks, the emergency case is one of the applications.This paper presents the outcome of indoor emergency stairwell measurement campaigns for 5G system at 26 GHz, 28GHz, 32 GHz, and 38 GHz, which were conducted at the University Technology Malaysia, Kuala Lumpur, Malaysia. Toeffectively evaluate the performance of 5G wireless systems in these different bands, single- and multifrequency path lossmodels are proposed for this environment. This paper proposes a new path loss model based on a new physical anchorpoint referred to as physical-anchor stair (PAS) path loss model. In a single-frequency large-scale case study, the PASand the floating intercept (FI) path loss model are investigated at the 20 GHz and 30 GHz bands. Moreover, this studyis extended to cover the multifrequency path such as the alpha, beta, and gamma model and the close-in free space pathloss model with frequency weight (CIF) model. The CIF model is developed in this paper. The proposed PAS modelshows high accuracy (physically based model) and less complexity compared with the studied models. Results show thatthe path loss exponent values vary between 6.6 and 7.9 for all measured frequencies using the proposed PAS model andbetween 9.1 and 10.9 using the FI model.

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