I. INTRODUCTION

II. PHYSICAL LAYER SECURITY OF URLLC

III. PLS PERFORMANCE EVALUATION METRICS FOR URLLC

IV. PLS OF URLLC IN 5G MISSION-CRITICAL USE CASES

V. PLS OF URLLC IN 5G ENABLING TECHNOLOGIES

VI. ML ENABLED PLS SOLUTIONS FOR URLLC

VII. HYPER RELIABLE LOW LATENCY COMMUNICATION IN 6G

VIII. OPEN CHALLENGES AND FUTURE RESEARCH DIRECTIONS

IX. CONCLUSION