(英) |
Mobile data traffic has been increasing rapidly due to increase of hand-held devices such as smart-phones and tablet PCs, and interworking among wireless networks across licensed and unlicensed bands has gained much attention to support this huge traffic. Especially, there exists many works on traffic offloading to unlicensed system such as IEEE 802.11 wireless LAN (local area network). In this paper, we discuss the current status and future perspectives of unlicensed-band wireless access including next generation wireless LANs, LAA, LTE-U, and MuLTE-fire. |