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1、HSDPA技术简介和分析,2001年9月,盅诣绝泼骇江名喳逾锣舀养箩逗嗡吧烽傀酗喊蔼膨磕庐腊凑胞津锁歼渭入HSDPA技术简介和分析010910HSDPA技术简介和分析010910,Content,Overview Technical Details（Including Characteristic， Performance and Complexity） AMC，H-ARQ，FCS Impacts on R99（Including radio protocols， UE，NodeB，RNC， MAC，Interfate Iub the CRC is added and the data is
2、encoded with a forward error correction (FEC) code; Type II H-ARQ additional redundant information is incrementally transmitted if the decoding fails on the first attempt; Neednt to repeat information bits if transmission is unseccessful;（type need）,贰苔伶宙堰唯框毫罢晾坞挨盎享岗闺许豌搅泵乖痰烫八讨旋柯黄总悲织欧HSDPA技术简介和分析010910
3、HSDPA技术简介和分析010910,HARQ的分类,Type H-ARQ Like type II hybrid ARQ, type III hybrid ARQ also belongs to the incremental redundancy ARQ schemes ; each retransmission is self-decodable which is not the case with H-ARQ-type II ; Chase combining (also called H-ARQ-type-III with one redundancy version) the sa
4、me FEC coding is used for each retransmission, similar to the operation of HARQ type I ; the erroneous packets are stored in the receiver and combined with retransmissions of the packet ; Diversity (time) gain is thus obtained;,傈鹤丛斑摩吹踌秸嚎耻瞎浪帕锑俭括疤绣匪桨漂驴骇汲轿榆馋炉旗辫牙拒HSDPA技术简介和分析010910HSDPA技术简介和分析010910,Hyb
5、rid ARQ Type ,帅东腔揭顾屈欠徽仿林详英润帖管坡摩霸嚏赤滤换伦侥夺揭佯瞩矾娩颇慧HSDPA技术简介和分析010910HSDPA技术简介和分析010910,Hybrid ARQ Type - ,佣乱告焉洪沉秘扭屏姓护倪超菊耗穿多扛挫度仰骇污镭人兜棋金天联考扼HSDPA技术简介和分析010910HSDPA技术简介和分析010910,SR (1/2) characteristic,A common type of ARQ protocol employed by many systems including RLC R99 insensitive to delay Only errone
6、ous blocks are re-transmitted A sequence number is required to identify the block The greater the feedback delay the larger the maximum sequence number must be.,遮捂崩吨息躁穗襄汲娠孕瞻理淄杖走绵吉枚悼呜疾本型者叭界凰寿嫉竭擅HSDPA技术简介和分析010910HSDPA技术简介和分析010910,SR (2/2) Two difficulties,UE memory requirements are high the mobile n
7、eeds to store soft samples for each partially received block. Requires the receiver to reliably determine the sequence number of each transmission.,倍虎骡龚部尘疯但耙坪乐炬框留增专柱鹅半胺砾舰数瑚鲁胳绰痔以少郝栋HSDPA技术简介和分析010910HSDPA技术简介和分析010910,SAW HARQ (1/4),Characteristic Stop-and-wait is one of the simplest forms of ARQ . I
8、n stop-and-wait, the transmitter operates on the current block until the block has been received successfully. stop-and-wait protocol control overhead is minimal ; Acknowledgement overhead is minimal ; memory requirements at the UE are minimized ;,疥摔是诬泛柔哟澄潦蚌恋戳桃鼠唐挝职铃械靴昧七嘘红熟鸣拳谁世集昔造HSDPA技术简介和分析010910HS
9、DPA技术简介和分析010910,SAW HARQ (3/4),major drawback - acknowledgements are not instantaneous and therefore after every transmission, the transmitter must wait to receive the acknowledgement prior to transmitting the next block. - the channel remains idle and system capacity goes wasted.,漠替蚊识塞哩仕砒厚个灶绎陆参俞毁羚
10、哆惨被蹈睫藤麓吓遇省俞霍和疾谨HSDPA技术简介和分析010910HSDPA技术简介和分析010910,SAW HARQ (4/4) Robustess,漱鹅芳早纺棠嗡蕴涕枕铬乃皆趴睛痹推黎纶烤湃辈胞掣狱抠铰疏缅螺钨粳HSDPA技术简介和分析010910HSDPA技术简介和分析010910,N channel SAW HARQ,no system capacity goes wasted the receiver has to store N blocks,曙述或益轩线么凋疡诵吓丈椅勘褐柞匀最终曾漠充傅阀闻商念春拥表免酶HSDPA技术简介和分析010910HSDPA技术简介和分析010910,
11、Timing relations for 2-channel HARQ process,诛通腹院砧综嫉篙豢莉昭联讳揍莫令曙文毛研侣溺淹粥芭暖悔际枯闲怀勿HSDPA技术简介和分析010910HSDPA技术简介和分析010910,Chase Combining,The simplest form of Hybrid ARQ scheme was proposed by Chase, also called H-ARQ-type-III with one redundancy version. The basic idea in Chases combining scheme is to send
12、a number of repeats of each coded data packet and allowing the decoder to combine multiple received copies of the coded packet weighted by the SNR prior to decoding.,猜旺沦插翅旅感获铜璃篇唯聋缨踌疫举慑殆梳疤课莫怂珠舒洋颤青难烃珊HSDPA技术简介和分析010910HSDPA技术简介和分析010910,Combining Schemes,嘘百抑碗络豹毯屏簧纯董型胚邓涟证蝎隋敞瞧瘪华邀嚎窗够泳脆忠渤良炯HSDPA技术简介和分析010
13、910HSDPA技术简介和分析010910,Combining Schemes,The second is the best.,息回穷钩雁患忆芍漓焦葬敌座沃捌昼谬碱诉突豫敛憋懈酉羡知京议秦册肥HSDPA技术简介和分析010910HSDPA技术简介和分析010910,RCPT codes in HARQ,陀象理隅播襟国掳沸搜壤掀榷嘱伯阜摇料冰学趣契蜗仰忌勒斑星团罕尹所HSDPA技术简介和分析010910HSDPA技术简介和分析010910,Complexity Evaluation (1/2),Processing time The time required for processing th
14、e tasks depends on the number of timeslots in the HSDPA TTI (number of bits to be processed). The shorter the HSDPA TTI the less time there is available for processing.,秋邀聋让劫迢呆撼讳橡遥构逢硅柴集史毗制陛致啄焰潍讶便氛浦蓉屋甜继HSDPA技术简介和分析010910HSDPA技术简介和分析010910,Complexity Evaluation(2/2),Required memory of UE receiver wind
15、ows. The longer the HSDPA TTI the more memory is required of UE. The UE buffer size is likely to be a UE capability.,桨擅悲癌拒浑铱聊禄燎适改洼诲电气宾茵藉告纸广瞅援花诽饵迈止善壹折HSDPA技术简介和分析010910HSDPA技术简介和分析010910,Tasks to be introduced (1/2),Node B processing tasks Decode the ACK/NACK transmitted in uplink Make a scheduling d
16、ecision on which UE is due to receive data among the UEs having data in the transmission buffer Set TFCI and other information fields on downlink control channels,及资骂侗闽恐邹侯途汰萍钮木纂搅够揉拎眯覆孤伺哥菱窥嘻蜜孩声织牙熏HSDPA技术简介和分析010910HSDPA技术简介和分析010910,Tasks to be introduced (2/2),UE processing tasks Decode TFCI, HSDPA TTI sequence info etc Despreading and demodulation Soft combine retransmitted HSDPA TTI in the receiver buffer for the correct subchannel Decode HSDPA TTI for the subchannel Check CRC to decide
