No abstract

In 2003, Nippon Telegraph and Telephone Corporation (NTT) commercialized the Wireless IP Access System (WIPAS), a point-to-multipoint fIXed wireless access (FWA) system utilizing the 26-GHZfrequency bandfor home and small office-home office (SOHO) users to provide broadband Internet access service. WIPAS provides a best-effort type IP access service with the transmission rate of 80 Mbit/s by combining wireless technology with optical fiber. For the next stage, we are developing the Advanced WIPAS, a more high-speed FWA system that provides triple play services; broadband IP service, 4-class Quality of Service (QoS) and HDTV video transmission services. We made prototype models of the Advanced WIPAS and test the prototype models in 2007. This paper describes the system concepts and specifications of the Advanced WIPAS. Furthermore some results ofprototype verifications are shown.

Since 2008, we have been developing the integrated SoC (System-On-Chip), which incorporates the ultra-high-speed multi-level QAM modem, multiple connection type MAC (Media Access Control) and also the Gigabit Ethernet interface, in a bid to adapt to the quasi-millimeter wave broadband wireless system. In 2009, we developed the SoC for the WT (remote side Wireless Terminal on P-MP (Point-to-Multi-Point) system) which functions on maximum 40 MHz radio clock, single-carrier 64QAM, and TDD-TDM/TDMA transmission. Then we were able to conduct the equipment level RF evaluations in the actual radio connection after implementing the SoC in the 26 GHz band prototype P -MP system which is called as "Advanced WIPAS (Wireless IP Access System)" [1][2][3]. This time, we have evaluated the performance of the prototype system. As a result, the adaptive sharing of the physical band 240 Mbps to up-link and down-link for each remote station has been succeeded and we have been able to confirm more than 180 Mbps of maximum effective throughput when one station of multi users is assigned the maximum resource to. At the same time, we have also been able to confirm that the function of QoS control and the broadcast transmission to the WTs worked effectively. Therefore we would like to report the results by this paper.