Đang chuẩn bị liên kết để tải về tài liệu:
Wireless data technologies reference handbook phần 10

Tham khảo tài liệu 'wireless data technologies reference handbook phần 10', kỹ thuật - công nghệ, kĩ thuật viễn thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 212 4TH GENERATION Wideband Orthogonal Frequency Division Multiplexing W-OFDM is a transmission design that provides for data to be encoded on multiple high-speed radio frequencies concurrently which allows for greater security along with increased amounts of data being sent as well as a more efficient use of bandwidth. W-OFDM is the basis of the IEEE standard 802.11a which is the foundation of the proposed IEEE standard 802.16. W-OFDM is a patented technology in the United States under patent number 5 282 222 and in Canada under patent number 2064 975. W-OFDM technology is currently used in Wi-LAN s broadband wireless access systems and allows for the implementation of low power multipoint RF networks that minimize interference with adjacent networks. The results in reduced interference which in turn enables independent channels to operate within the same band allowing multipoint networks and point-to-point backbone systems to be overlaid in the same frequency band. From a technical standpoint the 4G network which is also being called The Worldwide Network will be more stable and intelligent then ever before. 4G is a superior technology when compared to the existing aging copper and aluminium local loop. 4th Generation Technology is also seen as a move from intelligence in the network or at the edges to intelligence everywhere. 4G is an all-IP based access and core with effective management of all types of QoS over IP including handoff. Most likely 4G will beIPv6 based which is better adapted to mobile networks than IPv4 having adequate addressing capacity multicast management security mechanisms QoS management and mobility management. Some of the Benefits of 4th Generation Technology include Multiple functionalities in a single handset o Voice bulk data transfer image short message fax Web surfing video-conferencing broadcasting and future applications etc. Global roaming A single universal identification access number Seamless access transparent billing security