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In this paper, we study and predict the charged-particle pseudorapiditymultiplicity density ($\frac{dN_{ch}}{d\eta}$), transverse momentum spectra ofidentified particles and their ratios in relativistic heavy ion collisions atthe Large Hadron Collider (LHC), using the string-melting version of amulti-phase transport (AMPT) model with improved quark coalescence method.Results of the charged-particle pseudorapidity multiplicity density from AMPTmodel calculations for Pb+Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV arecompared with the experimental data. Good agreements are generally foundbetween theoretical calculations and experimental data. We predict$\frac{dN_{ch}}{d\eta}$ for Xe+Xe collisions at $\sqrt{s_{NN}}=5.44$ TeV atdifferent centralities, and $p_T$ spectra of charged pions, kaons and protons,and their ratios $K/\pi$ and $p/\pi$ in Pb+Pb collisions at$\sqrt{s_{NN}}=5.02$ TeV and Xe+Xe collisions at $\sqrt{s_{NN}}=5.44$ TeV thatare being studied at LHC. The $p_T$ spectra of identified particles in Pb+Pbcollisions from the improved AMPT model are compared and found to be consistentwith results from the iEBE-VISHNU hybrid model with TRENTo initial condition.

Centrality and Transverse momentum dependencies of Hadrons in Xe+Xe collisions at $\sqrt{s_{NN}}=5.44$ TeV from a multi-phase transport model