Throughput and Channel Occupancy Time fairness trade-off for Downlink LAA-Cat4 and WiFi Coexistence Based on Markov Chain (poster)

Abstract

License Assisted Access (LAA) is a feature in 3GPP Rel-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 works previously done on evaluation of downlink throughput performance of LAA and WiFi coexistence using analytical framework based on Markov Chains, to evaluate performance of the channel occupancy time for fully saturated traffic. Numerical results from the models show that initial contention window size is an important parameter for LAA system to adjust for either Throughput or Channel Occupancy Time fairness but both the specifications cannot be met simultaneously. The results also show that the trade-off is more significant when the number of LAAs outnumber WiFis and the case is no different using a single channel or two channels for transmission. Abstract)