1. Lp Mac trong kin trc ca mng Wimax Wimax ch lm vic trn hai lp u tin ca m hnh OSI (Lp vt l v lp lin kt d liu ). Lp vt l cho php truyn d liu 10-66Ghz + 2-11Ghz 802.16a ci tin ln s dng OFDM, h tr nhiu angten. Angten : Ci thin vng ph, cng sut thp, ti s dng c tn s, hiu qu bng thng cao. 802.16 MAC s dng lp biu. Trm thu bao cn cnh tranh lc khi u mang v sau cp pht mt khe thi gian truy cp bi trm gc. Kh thi gian c th m rng thu nh nhng c n nh trn trm thu bao. BS iu khin cc thng s QoS bng cch cn bng khe thi gian gia cc nhu cu trm thu bao.