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xia yi dai wu xian ju yu wang biao zhun --HiperLAN/2

2008-05-31 05:55:55 编辑來源:互联网 评论
 
 
 
本文为【下一代无线局域网标准--HiperLAN/2】的拼音翻译版
  zhai yao : wen zhang jie shao le HiperLAN/2 zhe yi wu xian ju yu wang biao zhun , lie ju le ji yu HiperLAN/2 de wang luo de te dian , ju ti miao shu le HiperLAN/2 de xie yi zhan jie gou , zui hou gei chu le ji yu HiperLAN/2 de wu xian wang luo de gong neng 。
   yao hai ci : wu xian ju yu wang ;HiperLAN/2 biao zhun ; kuan dai shu ju wang ; kuan dai wu xian jie ru
   Abstract:HiperLAN/2, a WLAN standard, is introdUCed through the description of characteristics of HiperLAN/2 networks, its PRotocol stack architecture and functions of HiperLAN/2 wireless networks.
   Key Words:WLAN; HiperLAN/2 standard; Broadband data network; Broadband wireless access
   mu qian , wu xian wang luo yu ji yu bu tong biao zhun de yi dong feng wo wang luo ( ru GSM、AMPS deng ) xiang si , zhu yao yong lai zhi chi yu yin ye wu , jin guan you yi xie ye yi jiao di su lv zhi chi shu ju ye wu 。 neng gou ti gong man zu Internet jie ru xu qiu de wu xian shu ju fu wu zheng zai kai fa zhi zhong 。 zai ju yu wang de huan jing xia , hen duo gong gei shang dou ti gong le ji yu 802.11 de wu xian ju yu wang chan pin , zhe xie chan pin neng gou ti gong 1 Mbit/s~11 Mbit/s de dai kuan 。 sui zhe jia ge de xia jiang , wu xian ju yu wang (WLAN) jiang cheng wei yi tai wang jie ru de yi zhong chong yao shou duan 。 wei le man zu jiang lai wang luo de xu qiu , yi zhong WLAN he feng wo wang luo jie he de ji shu zheng zai yan zhi zhi zhong 。 ben wen jiang jie shao zhe zhong xia yi dai de wu xian ju yu wang (WLAN) biao zhun --HiperLAN/2。
  1 ji yu HiperLAN/2 de wang luo
  yi dong zhong duan (MT) ke yi tong guo HiperLAN/2 ding yi de kong zhong jie kou yu jie ru dian tong xin 。 liang ge yi dong zhong duan (MT) zhi jian ye ke yi zhi jie tong xin 。MT de yong hu ke yi zai HiperLAN/2 wang nei zi you yi dong , bing ke yi que bao MT de yong hu de dao zui hao de chuan shu xing neng 。 yi ge MT zai jie ru HiperLAN/2 wang luo zhi hou , yi ci zhi he yi ge jie ru dian (AP) tong xin 。AP kao lv le wu xian wang luo tuo pu de bian hua , que bao wu xian wang luo shi zi dong pei zhi de 。
  2 ji yu HiperLAN/2 de wang luo de te dian
  ji yu HiperLAN/2 wang luo de yi ban te dian you :
  (1) gao su chuan shu
  HiperLAN/2 chuan shu su lv hen gao , zai wu li ceng da 54 Mbit/s, zai L3 da 25 Mbit/s。HiperLAN/2 cai yong le yi zhong jiao zheng jiao pin lv shu zi fu yong (OFDM) de mo kuai hua fang fa lai chuan shu mo ni xin hao 。OFDM zai fen shi huan jing xia shi fen you xiao 。HiperLAN/2 zai wu li ceng zhi shang de quan xin mei ti fang wen kong zhi (MAC) xie yi cai yong le yi zhong dong tai fen shi fu yong de fang fa , ta ke yi zui you xiao di li yong zi yuan 。
  (2) mian xiang lian jie de ji zhi
  zai HiperLAN/2 wang luo zhong , shu ju shi tong guo MT he AP zhi jian jian li de lian jie jin xing chuan shu de 。 lian jie zai kong zhong jie kou shang shi shi fen fu yong de 。HipeLAN/2 de lian jie you liang zhong lei xing : dian dui dian 、 dian dui duo dian 。 dian dui dian shi shuang xiang de , dian dui duo dian shi cong AP dao MT fang xiang de 。
  (3) zhi chi QoS
  HiperLAN/2 mian xiang lian jie de te dian shi de ta neng gou zhi jie zhi chi QoS。 mei yi ge lian jie dou neng fen pei dao yi ding de QoS, li ru dai kuan 、 yan shi 、 yan shi dou dong 、 wu bi te lv deng 。 zhe zhong gao chuan shu su lv he zhi chi QoS de te dian jiang you li yu duo zhong bu tong lei xing de shu ju liu ( ru shi pin 、 yu yin 、 shu ju ) de tong shi chuan shu 。
  (4) zi dong pin lv fen pei
  zai HiperLAN/2 wang luo zhong , bu xu yao xiang feng wo wang yi yang jin xing shou gong de pin lv bian zhi 。HiperLAN/2 de wu xian jie ru dian zai ta fu gai de fan wei nei neng zi dong xuan ze wu xian xin dao jin xing shu ju chuan shu 。AP jian ting lin jin de AP he qi ta wu xian zi yuan , bing gen ju yi yong de xin dao he qi ta AP zhan yong de xin dao xuan ze qia dang de wu xian xin dao , cong er jian shao gan rao 。
  (5) zhi chi an quan xing
  HiperLAN/2 wang luo zhi chi jian quan he jia mi 。AP he MT ke yi xiang hu jian quan 。 jian quan xu yao you yi ge zhi chi han shu , bu zai HiperLAN/2 wang de fan wei zhi nei jin xing 。 yi jian li lian jie de yong hu shu ju ke yi tong guo jia mi bao hu fang zhi tou ting 。
  (6) yi dong xing de zhi chi
  MT jiang que bao cong zui jin de AP chuan shu he jie shou shu ju , geng que qie de shuo MT tong guo ce liang xin zao bi que bao jie ru wu xian xin hao zui hao de AP。 yin ci sui zhe MT de yi dong , dang MT jian ce dao you bi xian zai yong de AP de wu xian chuan shu xing neng geng hao de AP,MT jiang qing qiu qie huan dao xin de AP zhong , suo you jian li de lian jie jiang hui zhuan yi dao xin de AP shang , er MT reng zai HiperLAN/2 wang luo shang , bing neng ji xu tong xin 。 zai qie huan zhong , ke neng hui diu shi yi xie bao 。 jia ru MT yi chu wang luo fu gai fan wei yi ding shi jian ,MT jiang shi qu he HiperLAN/2 wang luo de suo you lian xi , suo you lian jie jiang bei shi fang 。
  (7) wang luo he ying yong du li
  HiperLAN/2 de xie yi zhan ju you hen da de ling huo xing , ke yi shi ying duo zhong gu ding wang luo lei xing 。 yin ci HiperLAN/2 wang luo ji ke yi zuo wei jiao huan shi yi tai wang de wu xian jie ru zi wang , ye ke yi zuo wei di 3 dai feng wo wang luo de jie ru wang , bing qie zhe zhong jie ru dui yu wang luo ceng yi shang de yong hu bu fen lai shuo shi wan quan tou ming de 。 dang qian zai gu ding wang luo shang de ren he ying yong dou ke yi zai HiperLAN/2 wang shang yun xing , er IEEE 802.11 de yi xi lie xie yi dou zhi neng you yi tai wang zuo wei zhi cheng , yin ci HiperLAN/2 ju you gao du ling huo xing de te se 。
  (8) jie sheng gong lv
  HiperLAN/2 wang luo zhong , jie neng zhi li de ji zhi ji yu MT fa qi de jie neng qing qiu 。 zai ren he shi ke ,MT dou ke yi xiang AP qing qiu jin ru di gong hao zhuang tai huo xiu mian qi 。 zhen dui bu tong de xu qiu ( ru yao qiu jiao duan deng dai shi jian huo jiao di de gong lv ) ke yi cai yong bu tong de xiu mian qi 。
  
   3 HiperLAN/2 de xie yi zhan jie gou
  tu 1 suo shi wei HiperLAN/2 kong zhong jie kou de xie yi shen kao mo xing 。 xie yi zhan bei fen wei kong zhi ping mian bu fen he yong hu ping mian bu fen 。 yong hu ping mian bao kuo zai yi jian li de lian jie shang chuan shu shu ju de gong neng , kong zhi ping mian bao kuo jian li lian jie 、 shi fang lian jie 、 zhi li lian jie zhe 3 ge gong neng 。HiperLAN/2 you 3 ge ji ben ceng : wu li ceng 、 shu ju lian lu ceng 、 hui ju ceng 。
下一代无线局域网标准--HiperLAN/2

  tu 1 HiperLAN/2 xie yi shen kao mo xing
  3.1 wu li ceng
  HiperLAN/2 wu li ceng cai yong le OFDM ji shu , yi ci lai you xiao di dui kang shi jian mi san xin dao zhong jiao qiang de duo jing gan rao 。 ta cai yong 52 lu zi zai bo , qi zhong 48 lu chuan shu shi ji de yong hu shu ju , ling wai 4 lu chuan shu yin dao xu lie , yong yu xiang guan jie shou shi de xiang wei gen zong 。 xin dao jian ge wei 20 MHz, bao hu jian ge wei 800 ns, zhe zu yi dui kang 250 ns de shi yan kuo zhan , dui yu da bu fen ying yong huan jing lai jiang yi jing zu gou 。 dui yu yi xie xiao de shi nei ying yong huan jing , ke cai yong jiao duan de bao hu jian ge , ru 400 ns, lai huo de geng gao de chuan shu xiao lv 。
  HiperLAN/2 wu li ceng de ling yi ge te dian shi you ruo gan zhong tiao zhi he bian ma fang shi gong xuan ze 。 zhe yang gen ju bu tong de ying yong huan jing xian zhi he xing neng xu qiu , ke yi cai yong bu tong de fang shi 。
  OFDM dan ge zi zai bo de tiao zhi fang shi ke yi cai yong BPSK、QPSK、16QAM yi ji 64QAM。 qian xiang jiu cuo yi ban cai yong 1/2 ma lv 、 yue shu chang du wei 7 de juan ji bian ma , cai yong jie duan ji shu hou , ke yi shi ma lv ti gao dao 9/16 huo 3/4。
  3.2 shu ju lian lu kong zhi ceng
  shu ju lian lu kong zhi ceng you yi ge AP he duo ge MT zhi jian de shu ju lian lu zu cheng 。 luo ji lian lu kong zhi de gong neng bao kuo mei ti jie ru 、 shu ju chuan shu he lian jie kong zhi 。 shu ju lian lu ceng bao kuo yi xia xie yi :
  mei ti jie ru kong zhi xie yi
  cuo wu kong zhi xie yi
  xin ling shi ti shu ju lian lu lian jie kong zhi de wu xian lian lu kong zhi (RLC) xie yi , lian he kong zhi han shu (ACF) de wu xian zi yuan kong zhi (RRC) xie yi
  3.2.1 mei ti jie ru kong zhi zi ceng
  HiperLAN/2 de MAC zi ceng cai yong AP ji zhong zhi li de fang shi , you AP fu ze kong zhi MT zai yi ge MAC zhen zhong suo zhan ju de shi xi , bing tong zhi xiang ying de MT。 kong zhong jie kou ji yu shi fen shuang gong (TDD) he dong tai shi fen fu yong (TDMA)。MAC zhen shi wu li ceng he shu ju lian lu kong zhi (DLC) ceng zhi jian de jie kou 。 zai yi ge MAC zhen nei , shang xing he xia xing lian lu de tong xin ke yi tong bu jin xing , er qie shang xia xing lian lu de shi xi ke yi gen ju xu yao dong tai fen pei 。 ji ben de MAC zhen wei gu ding chang du 2 ms, qi zhong bao han le guang bo kong zhi 、 zhen kong zhi 、 jie ru kong zhi 、 shang xia xing lian lu shu ju he sui ji jie ru deng duo ge xin dao 。 chu le sui ji jie ru xin dao shi xi da ying jing zheng zhan yong yi wai , suo you shu ju dou yao tong guo zhuan yong de shi xi zai AP he MT zhi jian chuan shu 。 chu le guang bo kong zhi xin dao gu ding yi wai , qi ta yu dou gen ju dang qian de ye wu liang qing kuang dong tai tiao zheng 。
  3.2.2 cha cuo kong zhi xie yi
  cha cuo kong zhi (EC) zhu yao ji yu zi dong qing qiu chong fa (ARQ) ce lue 。 qian xiang jiu cuo zuo wei EC de bu chong 。ARQ ce lue ji yu xuan ze chong chuan ji zhi 。 zhe xu yao zai shou duan he fa duan you yi ge chuan song chuang 。 yin ci jie shou duan bi xu tong zhi fa duan suo you shou dao xiao xi de xu lie hao yi ji na xie xiao xi bu zheng que 。 er qie , fa duan ke neng yin wei yi xie xiao xi chao guo le zui da shi jian chang du er yao pao qi zhe xie xiao xi 。
  3.2.3 xin ling he kong zhi
  wu xian lian lu kong zhi xie yi wei xin ling shi ti : lian he kong zhi han shu (ACF) 、 wu xian zi yuan kong zhi (RRC) han shu he shu ju lian lu lian jie kong zhi (DCC) ti gong chuan shu fu wu 。 zhe 4 ge shi ti gou cheng le AP he MT zhi jian DLC xin ling jiao huan de kong zhi ping mian 。
  3.3 hui ju ceng
  hui ju ceng (CL) you liang ge zhu yao gong neng : jiang gao ceng de fu wu qing qiu shi ying yu DLC ti gong de fu wu , jiang gao ceng de bao bian cheng DLC zhong yong de ding chang 。CL de jie gou shi de HiperLAN/2 shi he yu wu xian xin dao bing neng cheng zai xu duo gu ding wang luo , ru yi tai wang 、IP、ATM、UMTS。HiperLAN/2 ding yi le liang zhong bu tong de CL ceng : ji yu ATM xin yuan he ji yu bao de CL。 qian zhe yong yu yu ATM wang xiang lian , hou zhe ke yi yong yu xu duo ji yu fen zu de wang luo jie gou shang 。
  ji yu fen zu de CL ju you yi ge tong yong he yi ge te ding fu wu bu fen , ta neng yong yu bu tong de wang luo zhong 。HiperLAN/2 ding yi le yi ge gong gong bu fen bing wei yi tai wang ding yi le yi ge te ding fu wu gong neng 。
  4 wu xian wang luo gong neng
  HiperLAN/2 biao zhun ding yi le da liang zhi chi wu xian wang luo de gong neng yu xin ling : dong tai pin lv xuan ze 、 lian lu zi shi ying 、 wu xian feng wo qie huan 、 duo shu tian xian he gong lv kong zhi 。
  (1) dong tai pin lv xuan ze
  HiperLAN/2 wu xian wang jiang gei mei ge AP zi dong fen pei tong xin pin lv 。 zhe shi you dong tai pin lv xuan ze gong neng (DFS) shi xian de , ta da ying ji ge cao zuo zhe gong xiang ke yong pin duan , tong shi bi mian fa sheng pin duan gan rao 。 mei ge AP dou shi ji yu AP yi ji he ta xiang guan de MT de lv bo xiang gan ce liang jin xing pin lv xuan ze de 。
  (2) lian lu zi shi ying
  lian lu zi shi ying ce lue shi wei le jie jue bian hua de wu xian xin dao zhi liang wen ti 。 xin hao gan rao bi sui zhe xi tong pei zhi de di dian yi ji si zhou wu xian feng wo liu liang de bu tong er bu tong 。 lian lu zi shi ying ce lue shi wu li ceng de lu bang xing neng sui lian lu zhi liang ce liang de jie guo er zi shi ying bian hua 。 yin ci , zai mei ge MAC zhen zhong , wu li ceng de mo shi shi dong tai xuan ze de 。
  (3) tian xian
  HiperLAN/2 zhong zhi chi shi yong duo shu tian xian yi gai jin lian lu de yu suan , zeng jia zai bo gan rao bi (C/I)。MAC xie yi he HiperLAN/2 zhen jie gou da ying zui duo shi yong 7 shu tian xian 。
  (4) qie huan
  qie huan shi you MT fa qi de 。 li ru yi ge MT dui si zhou de AP jin xing bi yao de ce liang bing xuan ze qia dang de AP jin xing tong xin 。 qie huan ce lue zai biao zhun zhong mei you ding yi , yun ying shang ke yi zi xing jue ding ru he xuan ze , ru xuan ze ji yu xin hao qiang du de qie huan 。
  (5) gong lv kong zhi
  MT he AP dou you fa she qi de gong lv kong zhi 。MT de gong lv kong zhi zhu yao yong lai jian hua AP jie shou ji de she ji ;AP gong lv kong zhi ze shi bu fen chu yu tiao zheng de yuan yin , ru jian shao wei xing xi tong de gan rao 。
  5 jie shu yu
  HiperLAN/2 ti gong le gao da 54 Mbit/s de yu ju yu wang he 3G feng wo wang de lian jie su lv , huan wei jiang lai de duo mei ti ying yong ti gong le yi dong xing he fu wu zhi liang de zhi chi 。 wo men ren wei HiperLAN/2、 lan ya ji shu 、 wu xian ju yu wang ji di 3 dai feng wo xi tong wei wei lai yi dong ji suan she bei ti gong yi ge wan zheng de tong xin huan jing 。
  shen kao wen xian
  1 Martin Johnsson. HiperLAN/2-The Broadband RadioTransmission Technology Operating in the 5 GHz Frequency Band. HiperLAN/2 Global Forum, 1999
  2 ETSI. Broadband Radio Access Networks (BRAN) HiperLAN Type 2 System Overview V1.1.1, 2000
  3 ETSI. Broadband Radio Access Networks (BRAN) HiperLAN Type 2 Packet Based Convergence Layer V1.1.1, 2000
  4 ETSI. Broadband Radio Access Networks (BRAN) HiperLAN Type 2 Physical (PHY) Layer V1.1.1, 2000
  5 ETSI. Broadband Radio Access Networks (BRAN) HiperLAN Type 2 Data Link Control (DLC) Layer; V1.1.1, 2000
  6 Khun-Jush J, Schramm P, Wachsmann U, et al. Structure and Performance of the HiperLAN/2 Physical Layer. VTC ´99 Fall, 1999
  7 Torsner J, Malmgren G. Radio Network Solutions for HIPERLAN/2. Proc of VTC ´99 Spring, 1999
  8 Habetha J, Mangold S, Wiegert J. 802.11a Versus HiperLAN/2-A Comparison of Decentralized and Centralized MAC Protocols for Multihop Ad Hoc Radio Networks. In: Proceedings of the 5th World Multiconference on Systemics, Cybernetics and Informatics (SCI). Orlando, USA, 2001
  
  
   zuo zhe jian jie : li ming , bi ye yu hua zhong ke ji da xue dian zi yu xin xi gong cheng xi , shuo shi 。
  huang zai lu , hua zhong ke ji da xue dian zi yu xin xi gong cheng xi jiao shou , bo shi sheng dao shi 。 zhong guo tong xin xue hui li shi 。【原文】【汉音对照
 
 
 
 
 
 
 
 
 
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zhai yao : wen zhang jie shao le HiperLAN/2 zhe yi wu xian ju yu wang biao zhun , lie ju le ji yu HiperLAN/2 de wang luo de te dian , ju ti miao shu le HiperLAN/2 de xie yi zhan jie gou , zui hou gei chu le ji yu HiperLAN/2 de wu xian wang luo de gong neng 。 yao hai ci : wu xian ju yu wang ;HiperLAN/2 biao zhun ; kuan dai shu ju wang ; kuan dai wu xian jie ru Abstract:HiperLAN/2, a WLAN standard, is introdUCed through the description of characteristics of HiperLAN/2 networks, its PRotocol stack architecture and functions of HiperLAN/2 wireless networks. Key Words:WLAN; HiperLAN/2 standard; Broadband data network; Broadband wireless access    mu qian , wu xian wang luo yu ji yu bu tong biao zhun de yi dong feng wo wang luo ( ru GSM、AMPS deng ) xiang si , zhu yao yong lai zhi chi yu yin ye wu , jin guan you yi xie ye yi jiao di su lv zhi chi shu ju ye wu 。 neng gou ti gong man zu Internet jie ru xu qiu de wu xian shu ju fu wu zheng zai kai fa zhi zhong 。 zai ju yu wang de huan jing xia , hen duo gong gei shang dou ti gong le ji yu 802.11 de wu xian ju yu wang chan pin , zhe xie chan pin neng gou ti gong 1 Mbit/s~11 Mbit/s de dai kuan 。 sui zhe jia ge de xia jiang , wu xian ju yu wang (WLAN) jiang cheng wei yi tai wang jie ru de yi zhong chong yao shou duan 。 wei le man zu jiang lai wang luo de xu qiu , yi zhong WLAN he feng wo wang luo jie he de ji shu zheng zai yan zhi zhi zhong 。 ben wen jiang jie shao zhe zhong xia yi dai de wu xian ju yu wang (WLAN) biao zhun --HiperLAN/2。   1 ji yu HiperLAN/2 de wang luo    yi dong zhong duan (MT) ke yi tong guo HiperLAN/2 ding yi de kong zhong jie kou yu jie ru dian tong xin 。 liang ge yi dong zhong duan (MT) zhi jian ye ke yi zhi jie tong xin 。MT de yong hu ke yi zai HiperLAN/2 wang nei zi you yi dong , bing ke yi que bao MT de yong hu de dao zui hao de chuan shu xing neng 。 yi ge MT zai jie ru HiperLAN/2 wang luo zhi hou , yi ci zhi he yi ge jie ru dian (AP) tong xin 。AP kao lv le wu xian wang luo tuo pu de bian hua , que bao wu xian wang luo shi zi dong pei zhi de 。   2 ji yu HiperLAN/2 de wang luo de te dian    ji yu HiperLAN/2 wang luo de yi ban te dian you :   (1) gao su chuan shu   HiperLAN/2 chuan shu su lv hen gao , zai wu li ceng da 54 Mbit/s, zai L3 da 25 Mbit/s。HiperLAN/2 cai yong le yi zhong jiao zheng jiao pin lv shu zi fu yong (OFDM) de mo kuai hua fang fa lai chuan shu mo ni xin hao 。OFDM zai fen shi huan jing xia shi fen you xiao 。HiperLAN/2 zai wu li ceng zhi shang de quan xin mei ti fang wen kong zhi (MAC) xie yi cai yong le yi zhong dong tai fen shi fu yong de fang fa , ta ke yi zui you xiao di li yong zi yuan 。   (2) mian xiang lian jie de ji zhi    zai HiperLAN/2 wang luo zhong , shu ju shi tong guo MT he AP zhi jian jian li de lian jie jin xing chuan shu de 。 lian jie zai kong zhong jie kou shang shi shi fen fu yong de 。HipeLAN/2 de lian jie you liang zhong lei xing : dian dui dian 、 dian dui duo dian 。 dian dui dian shi shuang xiang de , dian dui duo dian shi cong AP dao MT fang xiang de 。   (3) zhi chi QoS   HiperLAN/2 mian xiang lian jie de te dian shi de ta neng gou zhi jie zhi chi QoS。 mei yi ge lian jie dou neng fen pei dao yi ding de QoS, li ru dai kuan 、 yan shi 、 yan shi dou dong 、 wu bi te lv deng 。 zhe zhong gao chuan shu su lv he zhi chi QoS de te dian jiang you li yu duo zhong bu tong lei xing de shu ju liu ( ru shi pin 、 yu yin 、 shu ju ) de tong shi chuan shu 。   (4) zi dong pin lv fen pei    zai HiperLAN/2 wang luo zhong , bu xu yao xiang feng wo wang yi yang jin xing shou gong de pin lv bian zhi 。HiperLAN/2 de wu xian jie ru dian zai ta fu gai de fan wei nei neng zi dong xuan ze wu xian xin dao jin xing shu ju chuan shu 。AP jian ting lin jin de AP he qi ta wu xian zi yuan , bing gen ju yi yong de xin dao he qi ta AP zhan yong de xin dao xuan ze qia dang de wu xian xin dao , cong er jian shao gan rao 。   (5) zhi chi an quan xing   HiperLAN/2 wang luo zhi chi jian quan he jia mi 。AP he MT ke yi xiang hu jian quan 。 jian quan xu yao you yi ge zhi chi han shu , bu zai HiperLAN/2 wang de fan wei zhi nei jin xing 。 yi jian li lian jie de yong hu shu ju ke yi tong guo jia mi bao hu fang zhi tou ting 。   (6) yi dong xing de zhi chi   MT jiang que bao cong zui jin de AP chuan shu he jie shou shu ju , geng que qie de shuo MT tong guo ce liang xin zao bi que bao jie ru wu xian xin hao zui hao de AP。 yin ci sui zhe MT de yi dong , dang MT jian ce dao you bi xian zai yong de AP de wu xian chuan shu xing neng geng hao de AP,MT jiang qing qiu qie huan dao xin de AP zhong , suo you jian li de lian jie jiang hui zhuan yi dao xin de AP shang , er MT reng zai HiperLAN/2 wang luo shang , bing neng ji xu tong xin 。 zai qie huan zhong , ke neng hui diu shi yi xie bao 。 jia ru MT yi chu wang luo fu gai fan wei yi ding shi jian ,MT jiang shi qu he HiperLAN/2 wang luo de suo you lian xi , suo you lian jie jiang bei shi fang 。   (7) wang luo he ying yong du li   HiperLAN/2 de xie yi zhan ju you hen da de ling huo xing , ke yi shi ying duo zhong gu ding wang luo lei xing 。 yin ci HiperLAN/2 wang luo ji ke yi zuo wei jiao huan shi yi tai wang de wu xian jie ru zi wang , ye ke yi zuo wei di 3 dai feng wo wang luo de jie ru wang , bing qie zhe zhong jie ru dui yu wang luo ceng yi shang de yong hu bu fen lai shuo shi wan quan tou ming de 。 dang qian zai gu ding wang luo shang de ren he ying yong dou ke yi zai HiperLAN/2 wang shang yun xing , er IEEE 802.11 de yi xi lie xie yi dou zhi neng you yi tai wang zuo wei zhi cheng , yin ci HiperLAN/2 ju you gao du ling huo xing de te se 。   (8) jie sheng gong lv   HiperLAN/2 wang luo zhong , jie neng zhi li de ji zhi ji yu MT fa qi de jie neng qing qiu 。 zai ren he shi ke ,MT dou ke yi xiang AP qing qiu jin ru di gong hao zhuang tai huo xiu mian qi 。 zhen dui bu tong de xu qiu ( ru yao qiu jiao duan deng dai shi jian huo jiao di de gong lv ) ke yi cai yong bu tong de xiu mian qi 。   3 HiperLAN/2 de xie yi zhan jie gou    tu 1 suo shi wei HiperLAN/2 kong zhong jie kou de xie yi shen kao mo xing 。 xie yi zhan bei fen wei kong zhi ping mian bu fen he yong hu ping mian bu fen 。 yong hu ping mian bao kuo zai yi jian li de lian jie shang chuan shu shu ju de gong neng , kong zhi ping mian bao kuo jian li lian jie 、 shi fang lian jie 、 zhi li lian jie zhe 3 ge gong neng 。HiperLAN/2 you 3 ge ji ben ceng : wu li ceng 、 shu ju lian lu ceng 、 hui ju ceng 。 [url=http://www.wangchao.net.cn/bbs/pydetail_1747028.html][img]http://image.wangchao.net.cn/it/1323551952325.gif[/img][/url] tu 1 HiperLAN/2 xie yi shen kao mo xing   3.1 wu li ceng   HiperLAN/2 wu li ceng cai yong le OFDM ji shu , yi ci lai you xiao di dui kang shi jian mi san xin dao zhong jiao qiang de duo jing gan rao 。 ta cai yong 52 lu zi zai bo , qi zhong 48 lu chuan shu shi ji de yong hu shu ju , ling wai 4 lu chuan shu yin dao xu lie , yong yu xiang guan jie shou shi de xiang wei gen zong 。 xin dao jian ge wei 20 MHz, bao hu jian ge wei 800 ns, zhe zu yi dui kang 250 ns de shi yan kuo zhan , dui yu da bu fen ying yong huan jing lai jiang yi jing zu gou 。 dui yu yi xie xiao de shi nei ying yong huan jing , ke cai yong jiao duan de bao hu jian ge , ru 400 ns, lai huo de geng gao de chuan shu xiao lv 。   HiperLAN/2 wu li ceng de ling yi ge te dian shi you ruo gan zhong tiao zhi he bian ma fang shi gong xuan ze 。 zhe yang gen ju bu tong de ying yong huan jing xian zhi he xing neng xu qiu , ke yi cai yong bu tong de fang shi 。   OFDM dan ge zi zai bo de tiao zhi fang shi ke yi cai yong BPSK、QPSK、16QAM yi ji 64QAM。 qian xiang jiu cuo yi ban cai yong 1/2 ma lv 、 yue shu chang du wei 7 de juan ji bian ma , cai yong jie duan ji shu hou , ke yi shi ma lv ti gao dao 9/16 huo 3/4。   3.2 shu ju lian lu kong zhi ceng    shu ju lian lu kong zhi ceng you yi ge AP he duo ge MT zhi jian de shu ju lian lu zu cheng 。 luo ji lian lu kong zhi de gong neng bao kuo mei ti jie ru 、 shu ju chuan shu he lian jie kong zhi 。 shu ju lian lu ceng bao kuo yi xia xie yi : mei ti jie ru kong zhi xie yi cuo wu kong zhi xie yi xin ling shi ti shu ju lian lu lian jie kong zhi de wu xian lian lu kong zhi (RLC) xie yi , lian he kong zhi han shu (ACF) de wu xian zi yuan kong zhi (RRC) xie yi   3.2.1 mei ti jie ru kong zhi zi ceng   HiperLAN/2 de MAC zi ceng cai yong AP ji zhong zhi li de fang shi , you AP fu ze kong zhi MT zai yi ge MAC zhen zhong suo zhan ju de shi xi , bing tong zhi xiang ying de MT。 kong zhong jie kou ji yu shi fen shuang gong (TDD) he dong tai shi fen fu yong (TDMA)。MAC zhen shi wu li ceng he shu ju lian lu kong zhi (DLC) ceng zhi jian de jie kou 。 zai yi ge MAC zhen nei , shang xing he xia xing lian lu de tong xin ke yi tong bu jin xing , er qie shang xia xing lian lu de shi xi ke yi gen ju xu yao dong tai fen pei 。 ji ben de MAC zhen wei gu ding chang du 2 ms, qi zhong bao han le guang bo kong zhi 、 zhen kong zhi 、 jie ru kong zhi 、 shang xia xing lian lu shu ju he sui ji jie ru deng duo ge xin dao 。 chu le sui ji jie ru xin dao shi xi da ying jing zheng zhan yong yi wai , suo you shu ju dou yao tong guo zhuan yong de shi xi zai AP he MT zhi jian chuan shu 。 chu le guang bo kong zhi xin dao gu ding yi wai , qi ta yu dou gen ju dang qian de ye wu liang qing kuang dong tai tiao zheng 。   3.2.2 cha cuo kong zhi xie yi    cha cuo kong zhi (EC) zhu yao ji yu zi dong qing qiu chong fa (ARQ) ce lue 。 qian xiang jiu cuo zuo wei EC de bu chong 。ARQ ce lue ji yu xuan ze chong chuan ji zhi 。 zhe xu yao zai shou duan he fa duan you yi ge chuan song chuang 。 yin ci jie shou duan bi xu tong zhi fa duan suo you shou dao xiao xi de xu lie hao yi ji na xie xiao xi bu zheng que 。 er qie , fa duan ke neng yin wei yi xie xiao xi chao guo le zui da shi jian chang du er yao pao qi zhe xie xiao xi 。   3.2.3 xin ling he kong zhi    wu xian lian lu kong zhi xie yi wei xin ling shi ti : lian he kong zhi han shu (ACF) 、 wu xian zi yuan kong zhi (RRC) han shu he shu ju lian lu lian jie kong zhi (DCC) ti gong chuan shu fu wu 。 zhe 4 ge shi ti gou cheng le AP he MT zhi jian DLC xin ling jiao huan de kong zhi ping mian 。   3.3 hui ju ceng    hui ju ceng (CL) you liang ge zhu yao gong neng : jiang gao ceng de fu wu qing qiu shi ying yu DLC ti gong de fu wu , jiang gao ceng de bao bian cheng DLC zhong yong de ding chang 。CL de jie gou shi de HiperLAN/2 shi he yu wu xian xin dao bing neng cheng zai xu duo gu ding wang luo , ru yi tai wang 、IP、ATM、UMTS。HiperLAN/2 ding yi le liang zhong bu tong de CL ceng : ji yu ATM xin yuan he ji yu bao de CL。 qian zhe yong yu yu ATM wang xiang lian , hou zhe ke yi yong yu xu duo ji yu fen zu de wang luo jie gou shang 。    ji yu fen zu de CL ju you yi ge tong yong he yi ge te ding fu wu bu fen , ta neng yong yu bu tong de wang luo zhong 。HiperLAN/2 ding yi le yi ge gong gong bu fen bing wei yi tai wang ding yi le yi ge te ding fu wu gong neng 。   4 wu xian wang luo gong neng   HiperLAN/2 biao zhun ding yi le da liang zhi chi wu xian wang luo de gong neng yu xin ling : dong tai pin lv xuan ze 、 lian lu zi shi ying 、 wu xian feng wo qie huan 、 duo shu tian xian he gong lv kong zhi 。   (1) dong tai pin lv xuan ze   HiperLAN/2 wu xian wang jiang gei mei ge AP zi dong fen pei tong xin pin lv 。 zhe shi you dong tai pin lv xuan ze gong neng (DFS) shi xian de , ta da ying ji ge cao zuo zhe gong xiang ke yong pin duan , tong shi bi mian fa sheng pin duan gan rao 。 mei ge AP dou shi ji yu AP yi ji he ta xiang guan de MT de lv bo xiang gan ce liang jin xing pin lv xuan ze de 。   (2) lian lu zi shi ying    lian lu zi shi ying ce lue shi wei le jie jue bian hua de wu xian xin dao zhi liang wen ti 。 xin hao gan rao bi sui zhe xi tong pei zhi de di dian yi ji si zhou wu xian feng wo liu liang de bu tong er bu tong 。 lian lu zi shi ying ce lue shi wu li ceng de lu bang xing neng sui lian lu zhi liang ce liang de jie guo er zi shi ying bian hua 。 yin ci , zai mei ge MAC zhen zhong , wu li ceng de mo shi shi dong tai xuan ze de 。   (3) tian xian   HiperLAN/2 zhong zhi chi shi yong duo shu tian xian yi gai jin lian lu de yu suan , zeng jia zai bo gan rao bi (C/I)。MAC xie yi he HiperLAN/2 zhen jie gou da ying zui duo shi yong 7 shu tian xian 。   (4) qie huan    qie huan shi you MT fa qi de 。 li ru yi ge MT dui si zhou de AP jin xing bi yao de ce liang bing xuan ze qia dang de AP jin xing tong xin 。 qie huan ce lue zai biao zhun zhong mei you ding yi , yun ying shang ke yi zi xing jue ding ru he xuan ze , ru xuan ze ji yu xin hao qiang du de qie huan 。   (5) gong lv kong zhi   MT he AP dou you fa she qi de gong lv kong zhi 。MT de gong lv kong zhi zhu yao yong lai jian hua AP jie shou ji de she ji ;AP gong lv kong zhi ze shi bu fen chu yu tiao zheng de yuan yin , ru jian shao wei xing xi tong de gan rao 。   5 jie shu yu   HiperLAN/2 ti gong le gao da 54 Mbit/s de yu ju yu wang he 3G feng wo wang de lian jie su lv , huan wei jiang lai de duo mei ti ying yong ti gong le yi dong xing he fu wu zhi liang de zhi chi 。 wo men ren wei HiperLAN/2、 lan ya ji shu 、 wu xian ju yu wang ji di 3 dai feng wo xi tong wei wei lai yi dong ji suan she bei ti gong yi ge wan zheng de tong xin huan jing 。    shen kao wen xian 1 Martin Johnsson. HiperLAN/2-The Broadband RadioTransmission Technology Operating in the 5 GHz Frequency Band. HiperLAN/2 Global Forum, 1999 2 ETSI. Broadband Radio Access Networks (BRAN) HiperLAN Type 2 System Overview V1.1.1, 2000 3 ETSI. Broadband Radio Access Networks (BRAN) HiperLAN Type 2 Packet Based Convergence Layer V1.1.1, 2000 4 ETSI. Broadband Radio Access Networks (BRAN) HiperLAN Type 2 Physical (PHY) Layer V1.1.1, 2000 5 ETSI. Broadband Radio Access Networks (BRAN) HiperLAN Type 2 Data Link Control (DLC) Layer; V1.1.1, 2000 6 Khun-Jush J, Schramm P, Wachsmann U, et al. Structure and Performance of the HiperLAN/2 Physical Layer. VTC ´99 Fall, 1999 7 Torsner J, Malmgren G. Radio Network Solutions for HIPERLAN/2. Proc of VTC ´99 Spring, 1999 8 Habetha J, Mangold S, Wiegert J. 802.11a Versus HiperLAN/2-A Comparison of Decentralized and Centralized MAC Protocols for Multihop Ad Hoc Radio Networks. In: Proceedings of the 5th World Multiconference on Systemics, Cybernetics and Informatics (SCI). Orlando, USA, 2001   zuo zhe jian jie :   li ming , bi ye yu hua zhong ke ji da xue dian zi yu xin xi gong cheng xi , shuo shi 。    huang zai lu , hua zhong ke ji da xue dian zi yu xin xi gong cheng xi jiao shou , bo shi sheng dao shi 。 zhong guo tong xin xue hui li shi 。
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