This ARIB STANDARD (hereinafter “this standard”) specifies the physical (PHY) layer and the media access control (MAC) layer of the radio equipment of “portable” base stations and mobile stations for the broadband wireless communication systems using 200 MHz band stipulated in the Ministry of Internal Affair and Communications (MIC) Ordinance Regulating Radio Equipment (ORE), Article 49.31. This standard consists of two modes, Mode 1 and Mode 2. Table 1-1 compares major parameters of these two modes. Mode 1 is the subset of “WirelessMAN-OFDMA” in the IEEE802.16™ standard, which provides two sets of parameter choice for FFT size, 512 and 1024. In Mode 2, on the other hand, some parameters are modified from Mode 1 to fit the broadband communication operation in the allocated frequency band (200MHz band). . Main difference between Mode 1 and Mode 2 is the FFT size and the pilot subcarriers patterns for channel estimation. FFT size is 512 or 1024 in Mode 1 and 1024 only in Mode 2. Regarding the pilot subcarriers pattern, the time interval between the pilot subcarriers in one radio resource unit (“tile” in the WirelessMAN-OFDMA) is longer in Mode 2 compared with Mode 1.

MIC ORE, Article 49.31[1] describes the Japanese 200 MHz-band broadband wireless communication systems, which includes several possible operation forms as shown in Figure 1-1. This standard deals with only form (b) consisting of portable BS and MSs. Figure 1-2 shows the scope of this standard. Specifications of PHY and MAC layers of this system are described in this standard. This system does not cover the features of AAS, MIMO, mini-subchannel, etc that may be supported by the form (a) that is so-called “large-zone system”.