Markov Chain Based Performance Analysis of LAA and WiFi Coexistence in Dual Carrier Aggregation

License Assisted Access (LAA) is a feature in 3GPP Re1-13 which is the global standard for LTE deployment in the unlicensed band. While the availability of large amount of extra spectrum in unlicensed band is always desirable, the coexistence of LAA and WiFi with an acceptable fairness is a primary challenge. This paper extends the Markov Chain based performance analysis of LTE-WiFi coexistence for a single-carrier contention to a dual-carrier contention for WiFi-Only, LAA-Only and finally WiFi-LAA coexistence. A dual-carrier aggregation allows us to aggregate the secondary channel onto the primary channel when the secondary channel is free before transmission. In this paper, throughput and airtime performance in this dual-carrier aggregation is studied and compared with single-carrier case for different number of WiFi and LTE stations.