銆�銆�鏍规摎(j霉)绡�(ji茅)榛�(di菐n)瑷晱(w猫n)淇￠亾鏂瑰紡鐨勭劇(w煤)绶氬偝鎰熷櫒缍�(w菐ng)绲�(lu貌)MAC鍗�(xi茅)璀板垎椤�(l猫i)
銆�銆�鐩墠閲濆皪(du矛)涓嶅悓鐨勫偝鎰熷櫒">鍌虫劅鍣ㄧ恫(w菐ng)绲�(lu貌)鎳�(y墨ng)鐢�锛岀爺绌朵汉鍝″緸涓嶅悓鐨勬柟闈㈡彁鍑轰簡澶氱óMAC鍗�(xi茅)璀�锛屼絾鐩墠灏�(du矛)WSN鐨凪AC鍗�(xi茅)璀伴倓缂轰箯涓�鍊�(g猫)绲�(t菕ng)涓�鐨勫垎椤�(l猫i)鏂瑰紡銆傛湰绡�(ji茅)鎻愬嚭鐨凪AC鍒嗛(l猫i)鏂规硶鏄牴鎿�(j霉)绡�(ji茅)榛�(di菐n)瑷晱(w猫n)淇￠亾鐨勬柟寮忥細绲︾瘈(ji茅)榛�(di菐n)鍒嗛厤鍥哄畾鐨勭劇(w煤)绶氫俊閬撻倓鏄瘈(ji茅)榛�(di菐n)闅ㄦ(j墨)绔�(j矛ng)鐖�(zh膿ng)瑷晱(w猫n)淇￠亾锛屽皣WSN鐨凪AC鍗�(xi茅)璀板垎鐐�4椤�(l猫i)锛氬熀浜庣(j矛ng)鐖�(zh膿ng)锛圕ontention-based锛夌殑MAC鍗�(xi茅)璀�锛涘熀浜庤(di脿o)搴︾畻娉曪紙Scheduling-based锛夌殑MAC鍗�(xi茅)璀�锛涢潪纰版挒锛圕ollision free锛夌殑MAC鍗�(xi茅)璀�锛涙贩鍚堬紙Hybrid scheme锛夌殑MAC杈﹁銆�
銆�銆�鐒�(w煤)绶氬偝鎰熷櫒缍�(w菐ng)绲�(lu貌)MAC鍗�(xi茅)璀板垎椤�(l猫i)鈥斺�斿熀浜庣(j矛ng)鐖�(zh膿ng)鐨凪AC鍗�(xi茅)璀�
銆�銆�澶氭暩(sh霉)鍒嗗竷寮廙AC鍗�(xi茅)璀伴噰鐢ㄨ級娉㈠伒鑱�(t墨ng)鎴栨矕绐侀伩鍏嶆(j墨)鍒跺苟閲囩敤闄勫姞鐨勪俊浠ゆ帶鍒舵秷鎭締(l谩i)铏曠悊闅辫棌鍜屾毚闇茬瘈(ji茅)榛�(di菐n)鍟�(w猫n)椤�?锛涱媱璇�?j矛ng)鐖�(zh膿ng)闅ㄦ(j墨)瑷晱(w猫n)鐨凪AC鍗�(xi茅)璀版槸绡�(ji茅)榛�(di菐n)闇�瑕佺櫦(f膩)閫佹暩(sh霉)鎿�(j霉)鏅�(sh铆)锛岄�氶亷(gu貌)绔�(j矛ng)鐖�(zh膿ng)鏂瑰紡浣跨敤鐒�(w煤)绶氫俊閬撱�侷EEE802.11 MAC鍗�(xi茅)璀伴噰鐢ㄥ付娌栫獊閬垮厤鐨勮級娉㈠伒鑱�(t墨ng)澶氳矾瑷晱(w猫n)锛圕arrier SensorMultiple Access with Collision Avoidance锛孋SMA/CA锛夋槸鍏稿瀷鐨勫熀浜庣(j矛ng)鐖�(zh膿ng)MAC鍗�(xi茅)璀�銆傚湪IEEES02.11 MAC鍗�(xi茅)璀扮殑鍩虹(ch菙)涓�锛岀爺绌朵汉鍝℃彁鍑轰簡瑷卞鐢ㄤ簬鍌虫劅鍣�">鍌虫劅鍣ㄧ恫(w菐ng)绲�(lu貌)鐨勫熀浜庣(j矛ng)鐖�(zh膿ng)鐨凪AC鍗�(xi茅)璀帮紝渚嬪锛歋-MAC鍗�(xi茅)璀�銆乀-MAC鍗�(xi茅)璀�銆丄RC-MAC鍗�(xi茅)璀般�丼ift-MAC鍗�(xi茅)璀�銆乄ise-MAC鍗�(xi茅)璀扮瓑銆�
銆�銆�鐒�(w煤)绶氬偝鎰熷櫒缍�(w菐ng)绲�(lu貌)MAC鍗�(xi茅)璀板垎椤�(l猫i)鈥斺�斿熀浜嶤SMA/CA鐨凪AC鍗�(xi茅)璀�
銆�銆�CSMA/CA涓昏鎳�(y墨ng)鐢ㄤ簬鐒�(w煤)绶氬眬鍩熺恫(w菐ng)IEEE802.11MAC鍗�(xi茅)璀板湪鍒嗗竷寮忓崝(xi茅)鍑嬶紙Distributed Coordination Function锛孌CF锛夊伐浣滄ā寮忎笅鐨勪竴绋崝(xi茅)璀�銆傚湪DCF宸ヤ綔妯″紡涓�锛岀瘈(ji茅)榛�(di菐n)鍦ㄥ伒鑱�(t墨ng)鍒扮劇(w煤)绶氫俊閬撳繖涔嬪悗锛岄噰鐢–SMA/CA姗�(j墨)鍒跺拰闅ㄦ(j墨)閫�閬跨畻娉�锛屽(sh铆)鐝�(xi脿n)鐒�(w煤)绶氫俊閬撶殑鍏变韩銆�
銆�銆�IEEE802.15.4鍩烘湰涓婃槸鎳�(y墨ng)鐢ㄩ(l猫i)浼糏EEF802.11鐨凜SMA/CA鏂瑰紡绔�(j矛ng)鐖�(zh膿ng)閫氫俊锛岀瘈(ji茅)榛�(di菐n)瀹氭湡鍋佃伣(t墨ng)淇￠亾锛屾帴鏀禕eacon骞�銆傚湪娌�(m茅i)鏈夋暩(sh霉)鎿�(j霉)鐧�(f膩)閫佸拰鎺ユ敹鏅�(sh铆)閫�(j矛n)鍏ヤ紤鐪犺綁(zhu菐n)鑷�(t谩i)锛屽崝(xi茅)瑾�(di脿o)鍣紙Coordinator锛夌珐瀛樼櫦(f膩)寰�浼戠湢绡�(ji茅)榛�(di菐n)鐨勬暩(sh霉)鎿�(j霉)锛屽畾鏈熺櫦(f膩)閫丅eacon骞�锛屽箑鏀滃付閫欎簺鏁�(sh霉)鎿�(j霉)鐨勭洰鐨勭瘈(ji茅)榛�(di菐n)鍦板潃锛岀瘈(ji茅)榛�(di菐n)鐧�(f膩)鐝�(xi脿n)鍗�(xi茅)瑾�(di脿o)鍣ㄧ珐瀛樹簡鐧�(f膩)寰�鑷繁鐨勬暩(sh霉)鎿�(j霉)涔嬪悗锛屽悜鍏剁櫦(f膩)閫丳OLL骞�锛岃〃绀鸿嚜宸卞彲浠ユ帴鏀舵暩(sh霉)鎿�(j霉)锛屽崝(xi茅)鍑嬪櫒鍦ㄦ敹鍒癙OLL骞�涔嬪悗锛岄鍏堝悜绡�(ji茅)榛�(di菐n)鐧�(f膩)閫丄CK骞�锛岄毃鍚庣櫦(f膩)閫佺珐瀛樼殑鏁�(sh霉)鎿�(j霉)锛屽湪鏀跺埌鏁�(sh霉)鎿�(j霉)涔嬪悗锛岀瘈(ji茅)榛�(di菐n)鍚戝崝(xi茅)瑾�(di脿o)鍣ㄧ櫦(f膩)閫丄CK骞�銆�
銆�銆�鐒�(w煤)绶氬偝鎰熷櫒缍�(w菐ng)绲�(lu貌)MAC鍗�(xi茅)璀板垎椤�(l猫i)鈥斺�擲-MAC鍗�(xi茅)璀�
銆�銆�S-MAC锛圫ensor-MAC锛夊崝(xi茅)璀版槸杓冩棭鐨勯嚌灏�(du矛)WSN鐨勪竴绋甅AC鍗�(xi茅)璀�锛屼粬鏄湪802.11MAC鐨勫熀绀�(ch菙)涓婏紝閲囩敤涓嬮潰浠嬬垂鐨勫绋(j墨)鍒朵締(l谩i)娓涘皯浜嗙瘈(ji茅)榛�(di菐n)鑳介噺鐨勬秷鑰�銆傚浐瀹氬懆鏈熸�х殑鍋佃伣(t墨ng)鍜岀潯鐪狅細鐐轰簡娓涘皯鑳介噺鐨勬秷鐗︼紝鍌虫劅鍣�">鍌虫劅鍣ㄧ瘈(ji茅)榛�(di菐n)瑕佺洝閲忚檿浜庝綆鍔熺墻鐨勭潯鐪犵媭鎱�(t脿i)銆係-MAC鍗�(xi茅)璀伴噰鐢ㄤ簡浣庡崰绌烘瘮鐨勫懆鏈熸�х潯鐪�/鍋佃伣(t墨ng)銆傜偤浜嗕娇寰桽-MAC鍗�(xi茅)璀板叿鏈夎壇濂界殑鎿�(ku貌)灞曟�э紝鍦ㄨ钃嬬恫(w菐ng)绲�(lu貌)涓舰鎴愮溇澶氫笉鍚岀殑铏涙摤绨�銆�
銆�銆�娑堟伅鍌抽仦鎶�琛�(sh霉)锛氬皪(du矛)浜庣劇(w煤)绶氫俊閬�锛屽偝杓稿樊閷�(cu貌)鑸囧寘闀�(zh菐ng)搴︽垚姝ｆ瘮锛岀煭鍖呮垚鍔熷偝杓�?sh霉)姣嶆�曞顎撶闄侺(zh菐ng)鍖�銆傚湪S-MAC鍗�(xi茅)璀颁腑娑堟伅鍌抽仦鎶�琛�(sh霉)灏囬暦(zh菐ng)娑堟伅鍒嗘垚鑻ュ共鐭寘锛屽埄鐢≧TS/CTS鎻℃墜姗�(j墨)鍒�锛屼竴娆℃�х櫦(f膩)閫佹暣鍊�(g猫)闀�(zh菐ng)娑堟伅锛岄�欐ǎ鏃㈡彁楂樼櫦(f膩)閫佹垚鍔熺巼锛屾湁娓涘皯浜嗘帶鍒舵秷鎭�銆傛祦閲忚嚜閬╂噳(y墨ng)鍋佃伣(t墨ng)姗�(j墨)鍒讹細鍌虫劅鍣�">鍌虫劅鍣ㄧ瘈(ji茅)榛�(di菐n)鍦ㄨ垏閯板眳绡�(ji茅)榛�(di菐n)閫氫俊绲�(ji茅)鏉熷悗涓嶇珛鍗抽��(j矛n)鍏ョ潯鐪犵媭鎱�(t脿i)锛岃�屼繚鎸佸伒鑱�(t墨ng)涓�娈垫檪(sh铆)闁擄紝閲囩敤娴侀噺鑷仼鎳�(y墨ng)鍋佃伣(t墨ng)姗�(j墨)鍒�锛屾笡灏戜簡缍�(w菐ng)绲�(lu貌)涓殑鍌宠几寤堕伈銆�
銆�銆�S-MAC鍗�(xi茅)璀拌垏IEEE802.11 MAC鐩告瘮锛屽湪绡�(ji茅)鑳芥柟闈㈡湁浜嗗緢澶х殑鏀瑰杽銆備絾鐫＄湢姗�(j墨)鍒剁殑寮曞叆锛屼娇寰楃恫(w菐ng)绲�(lu貌)鐨勫偝杓稿欢閬插鍔�锛屽悶鍚愰噺涓嬮檷銆傞嚌灏�(du矛)S-MAC鍗�(xi茅)璀板瓨鍦ㄧ殑涓嶈冻锛岀爺绌朵汉鍝″皪(du矛)鍏堕��(j矛n)琛屼簡鏀归��(j矛n)锛屾彁鍑轰簡涓�绋付鏈夎嚜閬╂噳(y墨ng)鐫＄湢鐨凷-MAC鍗�(xi茅)璀�銆�
銆�銆�鐒�(w煤)绶氬偝鎰熷櫒缍�(w菐ng)绲�(lu貌)MAC鍗�(xi茅)璀板垎椤�(l猫i)鈥斺�擳-MAC鍗�(xi茅)璀�
銆�銆�T-MAC锛圱imeout-MAC锛夊崝(xi茅)璀拌垏鑷仼鎳�(y墨ng)鐫＄湢鐨凷-MAC鍗�(xi茅)璀板熀鏈�濇兂澶ч珨鐩稿悓銆傛暩(sh霉)鎿�(j霉)鍌宠几浠嶇劧閲囩敤RTS/CTS/DATA/ACK鐨�4娆℃彙鎵嬫(j墨)鍒�锛屼笉鍚岀殑鏄湪绡�(ji茅)榛�(di菐n)娲诲嫊(d貌ng)鐨勬檪(sh铆)闅欏収(n猫i)鎻掑叆浜嗕竴鍊�(g猫)TA锛圱ime Active锛夋檪(sh铆)闅欙紝鑻A鏅�(sh铆)闅欎箣闁撴矑(m茅i)鏈変换浣曟檪(sh铆)闁撶櫦(f膩)鐢�锛屽墖娲诲嫊(d貌ng)绲�(ji茅)鏉熼��(j矛n)鍏ョ潯鐪犵媭鎱�(t脿i)銆俆A鐨勫彇鍊煎皪(du矛)浜嶵-MAC鍗�(xi茅)璀版�ц兘鑷抽棞(gu膩n)閲嶈锛屽叾绱勬潫姊濅欢鐐猴細TA=m锛圕+R+T锛�锛宮>1锛屽叾涓瑿鐐虹(j矛ng)鐖�(zh膿ng)淇￠亾鏅�(sh铆)闁�锛孯鐐虹櫦(f膩)閫丷TS鍒嗙祫鐨勬檪(sh铆)闁擄紝T鐐篟TS鍒嗙祫绲�(ji茅)鏉熷埌鐧�(f膩)鍑篊TS鍒嗙祫闁�(k膩i)濮嬬殑鏅�(sh铆)闁�銆傚湪浠跨湡鐨勬檪(sh铆)鍊欙紝涓�鑸伕鍙杕=1.5锛屽嵆锛歍A=1.5
