Khi in& MS xac djnh khoing each den BS, n6 guy& djnh sv deng bO Slc9 hieu vi can bang mirc c8ng suit thu gift cac MS, qui trinh nay duqc gqi 11 sv sip xep. Khi khoi diu, viec sip xep yeu au BS du doin dO mph cea kenh vi thbi gian den cos MS. Sv deng bO doing xuing thi khong cin thiet khi dutmg nay luon duqc clang bO trubc. Nhung tong dutmg len, cac user can duqc deng be tii thieu tong met chu ky kholtng thin gian chin. Neu !thong thi nhigu xuyen 1E9 tlr vi nhigu gifra cac song mang se xiy ra. Tucmg tv, thong qua dieu kid& dog suit duerng xuing duqc you ciu a
gilun sv can nhigu qua cell lchic. Dieu khien c8ng suit dutmg len dg tang thbi gian seng cua pin vi giam xuyen nhigu gifts cac cell.
Trong wimax gem c6 4 loci thu tvc sip xip: Wien um, khan chu kt, you citu bang thong vi chuyen giao. Sip x6p duqc thvc hien tong 2 hoac 4 1c9 tv lien tvc mi lchong c6 sv kit hqp pha, dieu nay cho phi p BS biet mOt MS da mit &mg be, mat kit n6i djnh thbi rung hon so WA den t6 yang. Neu the tvc sip zap thinh c8ng BS gfrl mOt bitn tin dap ling sip zip di chi thi MS (lieu chinh thin gian offset thich (mg, lam dung ten s6 offset vi duet lap c8ng suit. Neu sip zip kh8ng thinh c8ng, MS se tang mac ding suit vi mOt bin tin sip xip mai de tiep tvc qua trinh nay den khi thinh dog.
2.2.4. du true ki bleu OFDMA va phin kink con
Citu tree k9 hieu OFDMA g6m c6 3 loai song mang con nhu trong hlnh 2.15: — Song mang con cat lieu de truyin din da