C S SAP ) LOP con hOMU Ogc M
331 Type (3) BR /ASS (II)
4.4. PHAN TiCH KET QUA MO PHONG 1 Hottt 'ging
4.4.1. Hottt 'ging
Vao theri diem bit dAu me phong, cite SS tiin hash quet cac kenh trong dai tin dd duqc djnh nghia de tim met kenh downlink thich hqp va deng b6. Sau do, cac SS than cac thong bao me ti kenh vat ljr DCD (downlink) vi UCD (uplink) de lay cac thong s6 can thief.
Tiep do, cac SS giri you cAu ranging (thong bao RNGREQ) den BS.
BS giri lai the dip Cmg ranging (thong bao RNGRSP) va the thong bdo ULMAP, DLMAP chira cac thong tin lop MAC nhu thai diem truy cap va cac thong tin khac ten ca hai kenh uplink va downlink.
BS phvc trong yang SS tam tru giri met yeu cAu den the BS ling gieng, xay ra 3 twang hqp:
Tnrong hqp 1: BS phvc 91 dip Cmg nhu cAu ctia SS ngay lap tire.
Tnrong hqp 2: BS eking be hem veri cac BS lang gieng nhim phac va SS khi SS nay roamming.
Twang hqp 3: kh8ng dip ling nhu au.
SS se gin tin nhin MSHO-REQ den BS phac va no: do la logi tin nhin
MAC MOB MSHO REQ. Da lieu bao gem ID hay chi se RSSI cua tram BS phvc
vv. ID hay chi se RSSI cua tram BS hang thin cling duqc phat hien trong qua trinh quet. Cac BS phvc vv se dip img 14i cac SS voi in nhin MSHO-RSP co dang MAC MOB BSHO RSP, veri met mac tieu ma BS phvc IN de nghi (met BS lang gieng co cuOng de tin hieu manh nhAt (RSSI manh nhat)).
SS nhan phan he'd tir BS phvc va hien tai vi bit dAu Handover veri de nghj cga BS lang gieng. Neu de nghj ctia cac BS 11 khac nhau fir BS hien tai, SS se giri met thong dip den BS phac va hien tai.
Sau khi dA nhan duqc thong bao RNGRSP tir BS. Tai thai diem 1, SS giri yeu
cau cap phat bang th8ng (thong bao BWREQ) cho BS, sau khi nhan duqc bang thong cap phat, SS bit du truyen du lieu den BS.
Chuvng 4: Me) phong hoot Ong hg theing WiMAX
UL and DL carom. Only signal strength measurement Include Traffic No traffic
Hinh 4.3. lien kit giiia MS WI cac BS
Rink 4.4. Mtir nang luTtng gifia 2 cell