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1、Page,*,單擊此處編輯母版標(biāo)題樣式,單擊此處編輯母版文本樣式,第二級,第三級,第四級,第五級,Copyright 2006 Huawei Technologies Co.,Ltd.All rights reserved.,Page,*,謝謝,Copyright 2006 Huawei Technologies Co.,Ltd.All rights reserved.,單擊此處編輯母版標(biāo)題樣式,單擊此處編輯母版文本樣式,第二級,第三級,第四級,第五級,TD-SCDMAHSDPA,基,本,本,原,原,理,理,前,言,言,基,于,于,3GPPR4,版,本,本,的,的,TD-SCDMA,接,入,入
2、,網(wǎng),網(wǎng),可,可,以,以,提,提,供,供,高,高,達(dá),達(dá),數(shù),數(shù),百,百,Kbps,的,傳,傳,輸,輸,速,速,率,率,,,,,能,能,夠,夠,支,支,持,持,WEB,瀏,覽,覽,、,、,下,下,載,載,和,和,視,視,頻,頻,等,等,中,中,速,速,PS,業(yè),務(wù),務(wù),但,是,是,這,這,樣,樣,的,的,峰,峰,值,值,速,速,率,率,仍,仍,不,不,能,能,為,為,用,用,戶,戶,帶,帶,來,來,明,明,顯,顯,區(qū),區(qū),別,別,于,于,2G,、,2.5G,網(wǎng),絡(luò),絡(luò),的,的,使,使,用,用,體,體,驗(yàn),驗(yàn),;,;,同,同,時(shí),時(shí),,,,,專,專,用,用,信,信,道,道,的,的,資,資,源,源
3、,占,占,用,用,方,方,式,式,,,,,導(dǎo),導(dǎo),致,致,以,以,突,突,發(fā),發(fā),為,為,特,特,點(diǎn),點(diǎn),的,的,PS,域,應(yīng),應(yīng),用,用,對,對,無,無,線,線,資,資,源,源,的,的,利,利,用,用,效,效,率,率,不,不,高,高,引,入,入,TDD,HSDPA,技,術(shù),術(shù),的,的,目,目,的,的,,,,,是,是,提,提,供,供,更,更,高,高,的,的,接,接,入,入,速,速,率,率,、,、,更,更,高,高,的,的,資,資,源,源,利,利,用,用,率,率,培,訓(xùn),訓(xùn),目,目,標(biāo),標(biāo),學(xué),完,完,本,本,課,課,程,程,后,后,,,,,您,您,應(yīng),應(yīng),該,該,能,能,:,:,闡,明,明,TD
4、D,HSDPA,的,技,技,術(shù),術(shù),特,特,點(diǎn),點(diǎn),列,出,出,TDD,HSDPA,采,用,用,的,的,關(guān),關(guān),鍵,鍵,技,技,術(shù),術(shù),結(jié),合,合,HSDPA,工,作,作,流,流,程,程,,,,,描,描,述,述,TDD,HSDPA,新,增,增,物,物,理,理,信,信,道,道,的,的,功,功,能,能,了,解,解,HSDPA,的,終,終,端,端,能,能,力,力,等,等,級,級,目,錄,錄,TDD,HSDPA,技,術(shù),術(shù),特,特,點(diǎn),點(diǎn),TDD,HSDPA,關(guān),鍵,鍵,技,技,術(shù),術(shù),TDD,HSDPA,無,線,線,接,接,口,口,物,物,理,理,層,層,目,錄,錄,TDD,HSDPA,技,術(shù),術(shù),
5、特,特,點(diǎn),點(diǎn),TDD,HSDPA,關(guān)鍵技術(shù),TDD,HSDPA,無線接口物,理,理層,引入,HSDPA,的必要性,基于3GPP R4版,本,本的TD-SCDMA,接,接入網(wǎng),系統(tǒng)容量受,限,限于下行容,量,量,主要體,現(xiàn),現(xiàn)在:,系統(tǒng)單載波,理,理論最大下,行,行容量較小,:,:,128Kbps/,時(shí)隙,最多,5,個(gè)時(shí)隙,640kbps/,載波,目前的信道,配,配置方式,,在,在數(shù)據(jù)業(yè)務(wù),的,的突發(fā)和低,活,活動性特征,,,,使下行容,量,量的實(shí)際利,用,用率非常低,,,,進(jìn)一步加,劇,劇了下行容,量,量受限的矛,盾,盾,HSDPA,技術(shù)特點(diǎn),HSDPA,(,HighSpeedDownlin
6、kPacket Access,)通過一系,列,列關(guān)鍵技術(shù),,,,實(shí)現(xiàn)了下,行,行的高速數(shù),據(jù),據(jù)傳輸,在物理層采,用,用,HARQ,和,AMC,等鏈路自適,應(yīng),應(yīng)技術(shù),引入高階調(diào),制,制(,16QAM,)提高頻譜,利,利用率,通過采用以,上,上技術(shù),單,載,載波容量大,大,大增加:理,論,論最大下行,容,容量達(dá)到,560Kbps/,時(shí)隙,最多,5,個(gè)時(shí)隙,2.8Mbps/,載波,引入新的共,享,享物理信道,,,,多個(gè)用戶,可,可以共享資,源,源,引入,快速數(shù)據(jù)調(diào),度,度算法,,每,5ms,可對用戶資,源,源重新分配,一,一次,通過采用以,上,上技術(shù),極,大,大地提高了,用,用戶下行瞬,時(shí),時(shí)速
7、率,提,高,高小區(qū)整體,吞,吞吐率,目 錄,TDD,HSDPA,技術(shù)特點(diǎn),TDD,HSDPA,關(guān)鍵技術(shù),TDD,HSDPA,無線接口物,理,理層,AMC,自適應(yīng)調(diào)制,和,和編碼,FastScheduling,快速調(diào)度,16QAM,調(diào)制,HARQ,(,Hybrid ARQ,),混合自動重傳,TD-SCDMA HSDPA,關(guān)鍵技術(shù),AMC,自適應(yīng)調(diào),制,制和編碼,引入,AMC(Adaptive Modulationand Coding),的原因,無線信道具,有,有很強(qiáng)的時(shí),變,變性,對這,種,種時(shí)變特性,進(jìn),進(jìn)行自適應(yīng),跟,跟蹤會給系,統(tǒng),統(tǒng)性能的改,善,善帶來極大,的,的好處,引入更多編,碼,碼
8、方式和調(diào),制,制方式,使,系,系統(tǒng)能夠通,過,過改變編碼,方,方式和調(diào)制,方,方式對鏈路,變,變化進(jìn)行自,適,適應(yīng)跟蹤,系統(tǒng)仿真表,明,明,采用,AMC,的系統(tǒng)可提,高,高大約,20,的平均吞,吐,吐率,AMC,原理,AMC,基于信道質(zhì),量,量的信息反,饋,饋,即,Channel QualityFeedback(CQI),UE,測量信道質(zhì),量,量,(SNR),報(bào)告,(,每,5ms,或更長周期,),給,Node-B,Node-B,基于,CQI,來選擇調(diào)制,方,方案,數(shù)據(jù),塊,塊大小和數(shù),據(jù),據(jù)速率,好的信道條,件,件,減少冗余編,碼,碼,甚至不,需,需要冗余編,碼,碼;,16QAM,壞的信道條,
9、件,件,增加更多冗,余,余編碼;,QPSK,AMC,技術(shù)實(shí)現(xiàn),AMC,的優(yōu)點(diǎn):,處于有利位,置,置的用戶可,以,以得到更高,的,的數(shù)據(jù)速率,,,,提高小區(qū),平,平均吞吐率,相對于改變,發(fā),發(fā)射功率進(jìn),行,行鏈路自適,應(yīng),應(yīng)的方案,,AMC,的干擾更小,,,,效果更好,附加,CRC,分組數(shù)據(jù),尾,比特,Tubro,編碼,速率,匹配,交織,M,階,QAM,AMC,D,E,M,U,X,AMC,自適應(yīng)調(diào)制,和,和編碼,FastScheduling,快速調(diào)度,16QAM,調(diào)制,HARQ,(,Hybrid ARQ,),混合自動重傳,TD-SCDMA HSDPA,關(guān)鍵技術(shù),16QAM,16,正交幅度調(diào),制,
10、制,16QAM:4 bits/,相位,Q,I,0000,0001,1001,1000,1010,1011,1110,1111,0100,1100,1101,0010,0110,0111,0011,0101,Q,I,00,10,01,11,QPSK:2 bits/,相位,編碼和調(diào)制,對,對速率的影,響,響對于,R4,一個(gè)時(shí)隙含,有,有兩個(gè)數(shù)據(jù),塊,塊,共,3522,704,個(gè),chips,SF=1,時(shí),單時(shí)隙,的,的符號數(shù)達(dá),到,到理論最大,值,值:,704,個(gè)符號,在,QPSK,調(diào)制方式下,,,,單的時(shí)隙,最,最大理論速,率,率:,704*2/5ms,281.4kbps,采用,1/3Turbo
11、,編碼,經(jīng)過,速,速率適配后,,,,實(shí)際的單,時(shí),時(shí)隙速率為,128kbps,數(shù)據(jù),352chips,GP,16,數(shù)據(jù),352chips,864chips,Midamble,編碼和調(diào)制,對,對速率的影,響,響對于,HSDPA,一個(gè)時(shí)隙含,有,有兩個(gè)數(shù)據(jù),塊,塊,共,3522,704,個(gè),chips,SF=1,時(shí),單時(shí)隙,的,的符號數(shù)達(dá),到,到理論最大,值,值:,704,個(gè)符號,在,16QAM,調(diào)制,方,方式,下,下,,單,單時(shí),隙,隙最,大,大理,論,論速,率,率,704*4/5ms,562.8kbps,采用,AMC,技術(shù),后,后,,信,信道,條,條件,好,好時(shí),不,不需,要,要增,加,加冗,
12、余,余編,碼,碼,,單,單時(shí),隙,隙速,率,率可,以,以達(dá),到,到,562.8kbps,上、,下,下行,時(shí),時(shí)隙,1:5,配置,時(shí),時(shí),,最,最大,理,理論,速,速率,:,:,562.8k,5,2.814Mbps,AMC,自適,應(yīng),應(yīng)調(diào),制,制和,編,編碼,FastScheduling,快速,調(diào),調(diào)度,16QAM,調(diào)制,HARQ,(,Hybrid ARQ,),混合自動重傳,TD-SCDMAHSDPA,關(guān)鍵,技,技術(shù),HARQ,混,合,合自,動,動重,傳,傳,HAQR,ARQ,FEC,ARQ(,AutomaticRepeat,r,e,Q,uest,),:依,靠,靠錯(cuò),碼,碼檢,測,測和,重,重發(fā)
13、,請,請求,來,來保,證,證信,號,號質(zhì),量,量,,特,特點(diǎn),是,是,“只,傳,傳不,糾,糾”,FEC(,ForwardErrorCorrection,),:根,據(jù),據(jù)接,收,收數(shù),據(jù),據(jù)中,冗,冗余,信,信息,來,來進(jìn),行,行糾,錯(cuò),錯(cuò),,特,特點(diǎn),是,是,“只,糾,糾不,傳,傳”,HARQ,技術(shù),綜,綜合,了,了,FEC,與,ARQ,的優(yōu),點(diǎn),點(diǎn),,避,避免,了,了,FEC,需要,復(fù),復(fù)雜,的,的譯,碼,碼設(shè),備,備和,ARQ,方式,信,信息,連,連貫,性,性差,的,的缺,點(diǎn),點(diǎn),在信,道,道條,件,件比,較,較好,的,的情,況,況下,,,,,HARQ,可以,起,起到,信,信道,編,編碼,
14、同,同樣,的,的作,用,用,,而,而且,效,效率,更,更高,HARQ,的工,作,作原,理,理,NodeB,UE,Process1(data),Process2(data),Process 1 ACK,Process 3(data),Process 2 ACK,5ms,5ms,5ms,5ms,Process1(data),接收,端,端有,一,一定,的,的緩,存,存器,(Buffer),,用,于,于保,留,留接,收,收到,的,的數(shù),據(jù),據(jù),,以,以便,后,后續(xù),進(jìn),進(jìn)行,數(shù),數(shù)據(jù),合,合并,這種,方,方式,有,有益,于,于減,少,少重,傳,傳時(shí),間,間,,從,從而,提,提高,小,小區(qū),吞,吞吐,量
15、,量,HARQ,的類,型,型,I,型,HARQ,即,傳,傳統(tǒng),的,的,ARQ,接收,端,端在,糾,糾錯(cuò),不,不成,功,功后,,,,將,接,接收,到,到的,包,包完,全,全丟,棄,棄,,并,并要,求,求發(fā),端,端重,傳,傳,II,型,HARQ,IncrementalRedundancy,遞增,冗,冗余,接收,到,到的,錯(cuò),錯(cuò)誤,數(shù),數(shù)據(jù),包,包不,會,會立,即,即被,丟,丟棄,,,,待,重,重傳,的,的數(shù),據(jù),據(jù)包,收,收到,,,,和,錯(cuò),錯(cuò)誤,的,的數(shù),據(jù),據(jù)包,合,合并,后,后再,進(jìn),進(jìn)行,譯,譯碼,II,型,HARQ,缺點(diǎn),:,:重,傳,傳數(shù),據(jù),據(jù)是,冗,冗余,信,信息,,,,不,包,包
16、括,系,系統(tǒng),比,比特,,,,當(dāng),第,第一,次,次傳,輸,輸?shù)?數(shù),數(shù)據(jù),包,包被,嚴(yán),嚴(yán)重,破,破壞,,,,將,無,無法,恢,恢復(fù),系,系統(tǒng),比,比特,III,型,HARQ,ChaseCombining,(,chase,博士,最,最早,提,提出,),),對,II,型,HARQ,進(jìn),行,行,了,了,改,改,進(jìn),進(jìn),,,,,重,重,傳,傳,的,的,碼,碼,字,字,具,具,有,有,自,自,解,解,碼,碼,的,的,能,能,力,力,,,,,并,并,不,不,依,依,賴,賴,于,于,第,第,一,一,次,次,傳,傳,輸,輸,的,的,數(shù),數(shù),據(jù),據(jù),TD-SCDMA,系,統(tǒng),統(tǒng),中,中,用,用,到,到,II&III,型,AMC,自,適,適,應(yīng),應(yīng),調(diào),調(diào),制,制,和,和,編,編,碼,碼,FastScheduling,快,速,速,調(diào),調(diào),度,度,16QAM,調(diào),制,制,HARQ,(,Hybrid ARQ,),混合自動重傳,TD-SCDMAHSDPA,關(guān),鍵,鍵,技,技,術(shù),術(shù),FastScheduling,快,快,速,速,調(diào),調(diào),度,度,算,算,法,法,調(diào),度,度,,,,,就,就,是,是,確,確,定,定