CU-LTESpectrally-Efcientand创新.PDFVIP

CU-LTE: Spectrally-Efficient and Fair Coexistence Between LTE and Wi-Fi in Unlicensed Bands Zhangyu Guan and Tommaso Melodia Department of Electrical and Computer Engineering Northeastern University, MA 02115, USA Email:zguan, melodia@ Abstract—To cope with the increasing scarcity of spectrum the radio resource management (RRM) schemes used by LTE resources, researchers have been working to extend LTE/LTE- and by systems already deployed in unlicensed band (e.g., A cellular systems to unlicensed bands, leading to so-called Wi-Fi). The underlying RRM policy of LTE systems is in unlicensed LTE (U-LTE). However, this extension is by no means straightforward, primarily because the radio resource fact based on centralized scheduling on each LTE base station management schemes used by LTE and by systems already (referred to as eNodeB). This is different from typical systems deployed in unlicensed bands are incompatible. Specifically, it with distributed control that are already deployed in unlicensed is well known that coexistence with scheduled systems like LTE bands, e.g., IEEE 802.11-based (Wi-Fi) systems with RRM degrades considerably the throughput of Wi-Fi networks that are based on distributed coordination function (DCF) running in based on carrier-sense medium access schemes. all wireless stations (STAs). It has been observed that the To address this challenge, we propose for the first time a cognitive coexistence scheme to enable spectrum sharing throughput of Wi-Fi systems