“ Coexistence between LTE and WiFi on 5 GHz “with corresponding deployment scenarios
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Hamarsheh, Noor aldeen
The use of Unlicensed spectrum by mobile network operators, particularly the 5 GHz band has recently attracts considerable attention, also there is an increasing demand for high data rates in wireless communication systems and since current licensed spectrum is of limited physical extent, new licensed frequency bands are becoming rare and expensive. To respond for this increased in wireless communication capacity demand the innovation focusing on techniques that enable better use of different types of spectrum for traffic off load, including unlicensed band is needed. Our study will focus on how to adjust the resource allocation and interference level adaptively according to the network condition, using a throughput ratio criteria acceptable to all users and without incurring excessive communication overheads, ensuring that LTE can coexist with Wi-Fi friendly and fairly by also complying with regularity requirements, we will investigate mechanisms capable of enabling coexistence and introduce a scenario oriented decision making methods for coexistence. 1. We will study the existing solution and compare between them. 2. We will use an open source simulator. 3. Based on the simulation we will modify the methods of coexistence. Where Licensed spectrum is used as an anchor to provide a robust connection, while unlicensed spectrum is operated as a secondary resource to enhance speed. Since LTE-Unlicensed (LTE-U) provides subscribers with higher-quality mobile voice, data, and video experience in high-traffic or low-signal locations, a fair coexistence mechanism with other networks, like Wi-Fi, or other LTE-Unlicensed (LTE-U) is essential. Where we propose two coexistence mechanisms that could be employed to ensure a fair channel access. First, we will present the coexistence mechanism fundamentals, and then downlink system performance of LBT coexistence mechanism are analyzed for multi-operator LTE-Unlicensed (LTE-U) deployments with different simulation scenarios. Comparing downlink performance of different scenarios driven by existing the LBT coexistence mechanisms and proposed some modifications coexistence mechanisms, first we introduce the most trustworthy coexistence mechanism, and then the high-performance coexistence scenario is provided. We conclude that Licensed Assisted Access (LAA) can coexist with Wi-Fi without impacting Wi-Fi more than an equivalent Wi-Fi network. In other words, Licensed Assisted Access (LAA) is a better neighbor to Wi-Fi than Wi-Fi itself. In addition, using NS-3, simulation results to demonstrate the excellent performance of this coexistence mechanism and scenario.