lte包库用户面培训

1、移动通信Security Level:LTE用户面培训TECHNOLOGIES CO.,.通信网PDF created with FinePrint pdfFactory Pro trial version移动通信l 用户面简介l 包数据汇聚层（PDCP）l 无线链路层（RLC）接入层（MAC）lTECHNOLOGIES CO.,.Page 2通信网PDF created with FinePrint pdfFactory Pro trial version移动通信用户面简介TECHNOLOGIES CO.,.Page 3通信网PDF created with FinePrint pdfFac

2、tory Pro trial version移动通信用户面在E-UTRAN的位置TECHNOLOGIES CO.,.Page 4通信网PDF created with FinePrint pdfFactory Pro trial version移动通信面和用户面的协议栈TECHNOLOGIES CO.,.Page 5通信网PDF created with FinePrint pdfFactory Pro trial versioncontrol-plane protocol stackUser-plane protocol stack移动通信L2的下行结构ROHCROHCROHCROHCPDC

3、PSecuritySecuritySecuritySecuritySegm. ARQ etcSegm. ARQ etcSegm. ARQ etcSegm. ARQ etcRLC.BCCHPCCHScheduling / Priority HandlingMACMultiplexing UE1Multiplexing UEnHARQHARQTECHNOLOGIES CO.,.Page 6通信网PDF created with FinePrint pdfFactory Pro trial version移动通信L2的上行结构PDCPRLCMACMultiplexingTECHNOLOGIES CO

4、.,.Page 7通信网PDF created with FinePrint pdfFactory Pro trial versionROHCROHCSecuritySecuritySegm. ARQ etc.Segm. ARQ etcLogical ChannelsScheduling / Priority Handling移动通信包数据汇聚层（PDCP）TECHNOLOGIES CO.,.Page 8通信网PDF created with FinePrint pdfFactory Pro trial version移动通信PDCP在协议栈中的位置TECHNOLOGIES CO.,.Page

5、 9通信网PDF created with FinePrint pdfFactory Pro trial version移动通信PDCP层的架构UE/E-UTRANRadio BearersPDCPentiyPDCP-SAPPDCP-SAP.C-SAPPDCPsublayerPDCP - PDURLC - SDU.RLCsublayerRLC UM / TM-SAPRLC AM-SAPTECHNOLOGIES CO.,.Page 10通信网PDF created with FinePrint pdfFactory Pro trial version移动通信PDCP 层的功能- header c

6、ompression and decompression of IP data flows using the ROHCprotocol, at the transmitting and receiving entity, respectively;p- transfer of data (user plane or control plane). This function is used for conveyanceof data between users of PDCP services;p-maintenance of PDCP sequence numbers for radio

7、bearers mapped on RLC AM; in-sequence delivery of upper layer PDUs at handover;duplicate elimination of lower layer SDUs at handover for radio bearers mappedpppon RLC AM;-ciphering and deciphering of user plane data and control plane data; integrity protection and integrity verification of control p

8、lane data; timer based discard;duplicate discarding.ppppTECHNOLOGIES CO.,.Page 11通信网PDF created with FinePrint pdfFactory Pro trial version移动通信PDCP层功能(面)TECHNOLOGIES CO.,.Page 12通信网PDF created with FinePrint pdfFactory Pro trial version移动通信PDCP层功能(用户面)TECHNOLOGIES CO.,.Page 13通信网PDF created with Fin

9、ePrint pdfFactory Pro trial version移动通信RoHC (Robust header compression)TECHNOLOGIES CO.,.Page 14通信网PDF created with FinePrint pdfFactory Pro trial versionProfile IdentifierUsage:Reference0x0000No compressionRFC 49950x0001RTP/UDP/IPRFC 3095, RFC48150x0002UDP/IPRFC 3095, RFC48150x0003ESP/IPRFC 3095, R

10、FC48150x0004IPRFC 3843, RFC48150x0006TCP/IPRFC 49960x0101RTP/UDP/IPRFC 52250x0102UDP/IPRFC 52250x0103ESP/IPRFC 52250x0104IPRFC 5225移动通信加密功能l 加密用户面数据和面数据：面：PDCP PDU的数据部分和MAC-I部分（messagepauthentication code ）被加密；如果面数据没有完整性保护，则MAC-I部分仍然，不过值设置为0；p 用户面：PDCP PDU的数据部分被加密；p 加密的算法和密钥都是的；设置的，加密的激活也是由来做TECHNOL

11、OGIES CO.,.Page 15通信网PDF created with FinePrint pdfFactory Pro trial version移动通信完整性保护功能l 完整性保护应用于面数据(SRB)完整性保护和完整性pp 完整性保护的算法和密钥都是来做的；设置的，它的激活也是由TECHNOLOGIES CO.,.Page 16通信网PDF created with FinePrint pdfFactory Pro trial version移动通信PDCP的丢包处理：l PDCP实体收到上层递交的一个PDCP SDU，就会为这个SDU启动一个Discard_Timerl 当一个PD

12、CP SDU的Discard_Timer超期时，UE就会丢弃这个PDCPSDU以及由它生成的PDCP PDU。如果这个PDCP的话，就向底层发一个丢弃指示命令PDU已经传递到底层TECHNOLOGIES CO.,.Page 17通信网PDF created with FinePrint pdfFactory Pro trial version移动通信PDCP Reordering windowTECHNOLOGIES CO.,.Page 18通信网PDF created with FinePrint pdfFactory Pro trial version移动通信无线链路层（RLC）TECHN

13、OLOGIES CO.,.Page 19通信网PDF created with FinePrint pdfFactory Pro trial version移动通信RLC在协议栈中的位置TECHNOLOGIES CO.,.Page 20通信网PDF created with FinePrint pdfFactory Pro trial version移动通信RLC的结构TECHNOLOGIES CO.,.Page 21通信网PDF created with FinePrint pdfFactory Pro trial version移动通信TM 实体TECHNOLOGIES CO.,.Page

14、 22通信网PDF created with FinePrint pdfFactory Pro trial version移动通信UM 实体TECHNOLOGIES CO.,.Page 23通信网PDF created with FinePrint pdfFactory Pro trial version移动通信AM 实体AM-SAPDCCH/DTCHDCCH/DTCHTECHNOLOGIES CO.,.Page 24通信网PDF created with FinePrint pdfFactory Pro trial version移动通信RLC层的功能Transfer of upper la

15、yer PDUs;Error correction through ARQ (only for AM data transfer); Concatenation, segmentation and reassembly of RLC SDUs (only for UM and AM data transfer);Re-segmentation of RLC data PDUs (only for AM data transfer);In sequence delivery of upper layer PDUs (only for UM and AM data transfer);Duplic

16、ate detection (only for UM and AM data transfer); RLC SDU discard (only for UM and AM data transfer); RLC re-establishment;Protocol error detection and recovery.lllllllllTECHNOLOGIES CO.,.Page 25通信网PDF created with FinePrint pdfFactory Pro trial version移动通信Segmentation / Concatenation/ Re-segmentati

17、onSegmentation就是分段，LTE中它只在UM的实体或者AM实体的侧l执行。当由MAC层指示的总的RLC PDU大小小于RLC SDU时，RLC实体就会根据此情况对RLC SDU执行分段操作，让生成的RLC PDU能适配进去。Concatenation就是串接，LTE中它只在UM的实体或者AM实体的侧l执行。当由MAC层指示的总的RLC PDU大小大于RLC SDU时，RLC层就会根据此情况对RLC SDU执行串接操作，让一个RLC SDU和其他RLC SDU或者其他RLC SDU的分段串联起来，让生成的RLC PDU能适配进去。Re-segmentation就是重分段，LTE中它只

18、在AM实体的侧执行。RLC AMl实体支持ARQ重传，当重传的RLC PDU无法适配到由MAC层指示的总的RLCPDU大小时，RLC层就会根据此情况对重传的RLC PDU执行分段操作，让生成的RLC PDU分段能适配进去。TECHNOLOGIES CO.,.Page 26通信网PDF created with FinePrint pdfFactory Pro trial version移动通信RLC AM的ARQ功能l RLC AM实体的侧RLC数据PDUs到对端RLC AM实体，对端接收侧接收到RLC数据PDUs，并在以下两种情况下状态报告给侧p 收到侧发来的Pollingp 检测到RLC数

19、据PDU接收失败侧会进行重传在以下两种情况p 收到接收侧发来的状态报告指示有数据包未接收lp 本侧底层发来的HARQ失败指示TECHNOLOGIES CO.,.Page 27通信网PDF created with FinePrint pdfFactory Pro trial version移动通信RLC AM的状态报告方触发(通过在RLC PDU中置Polling位为1来触发）p 最后一个包，发方buffer中没有数据p T_Poll_Retransmit定时器超时(Polling触发后没有收到回应)l完Poll_PDU个PDU后将P为置为1 （PDU个数触发）完Poll_Byte个字节后将P

20、为置为1 （Byte位触发）p 每p 每l 接收方触发p 检测到接收的RLC数据PDU错误时，触发状态报告TECHNOLOGIES CO.,.Page 28通信网PDF created with FinePrint pdfFactory Pro trial version移动通信RLC的丢包功能l 当收到丢弃指示命令丢弃特定的RLC SDU时，UM或AM RLC实体的发送端应该丢弃指示的RLCPDU中)SDU(只有在该SDU还没有被到RLC数据TECHNOLOGIES CO.,.Page 29通信网PDF created with FinePrint pdfFactory Pro trial

21、version移动通信接入层(MAC)TECHNOLOGIES CO.,.Page 30通信网PDF created with FinePrint pdfFactory Pro trial version移动通信MAC在协议栈中的位置TECHNOLOGIES CO.,.Page 31通信网PDF created with FinePrint pdfFactory Pro trial version移动通信MAC层的功能TECHNOLOGIES CO.,.Page 32通信网PDF created with FinePrint pdfFactory Pro trial versionMAC fu

22、nctionUEeNBDownlinkUplinkMapping between logical channels and transport channelsMultiplexingXXXXDe-multiplexingXXXXError correction through HARQTransport Format SelectionPriority handling between UEsPriority handling between logical channels of one UELogical Channel prioritisationXXScheduling inform

23、ation reportingXX移动通信通道和DL Channel mappingUL Channel mappingTECHNOLOGIES CO.,.Page 33通信网PDF created with FinePrint pdfFactory Pro trial version移动通信MAC层的主要过程和操作l 随即接入过程 Random access procedurel 不连续接收DRXl 调度 Schedulingl 混合冗余重传HARQTECHNOLOGIES CO.,.Page 34通信网PDF created with FinePrint pdfFactory Pro tr

24、ial version移动通信RACHTECHNOLOGIES CO.,.Page 35通信网PDF created with FinePrint pdfFactory Pro trial version移动通信随机接入的场景l Initial access from RRC_IDLE;l Initial access after radio link failure;l UL data arrival during RRC_CONNECTED requiring random access procedure; E.g. when UL synchronisation status is &

25、quot;non-synchronised" or there are no PUCCH resources for SR available.l Handover requiring random access procedure;l DL data arrival during RRC_CONNECTED requiring random access procedure; E.g. when UL synchronisation status is “non-synchronised”;All for contention base RA;last two for non-co

26、ntention based RATECHNOLOGIES CO.,.Page 36通信网PDF created with FinePrint pdfFactory Pro trial version移动通信随机接入过程竞争RA非竞争RATECHNOLOGIES CO.,.Page 37通信网PDF created with FinePrint pdfFactory Pro trial version移动通信DRXTECHNOLOGIES CO.,.Page 38通信网PDF created with FinePrint pdfFactory Pro trial version移动通信DRX概

27、念和一些定义l DRXp Stop monitoring PDCCH during some period of time.l Purpose of DRXp DRX functionality for RRC-CONNECTED allowing for optimised configurations that allow good UE power savings and network optimisations, for UEs introducing the possibility for better UE stand-by times without the need for

28、going to RRC-IDLE mode to reach the goal.l On duration Timerp UE每次从DRX醒来后维持醒着的时间,UE在该段时间内搜索PDCCHl Inactivity Timerp UE在醒着时每次l Active TimeHARQ初始的PDCCH后保持active的时间p UE从DRX醒来后保持醒着的总时间l HARQ RTT Timerp UE预期DL Retransmission到达的最少间隔时间l DRX Retransmission Timerp UE预期接收DL Retransmission的时间l DRX cycle length

29、p DRX cycle length一旦配置/重配置就固定，即因为active time大于on duration而变化。1R2-075009 SamsungTECHNOLOGIES CO.,.Page 39通信网PDF created with FinePrint pdfFactory Pro trial version移动通信DRX操作的图例pTECHNOLOGIES CO.,.Page 40通信网PDF created with FinePrint pdfFactory Pro trial version移动通信SchedulingTECHNOLOGIES CO.,.Page 41通信网

30、PDF created with FinePrint pdfFactory Pro trial version移动通信调度l 目的p 调度的好坏对于系统的性能影响很大，对于LTE十分重要p 最好的利用时/频/空/功率Qos，提高系统的容量l 基本调度原则用于不同的UEs和不同的业务，保证各种业务的p eNB负责上下性的调度，上下行是不同的调度器负责业务的Qos，业务量以及相关的无线承载，无线条件p 调度器需要考虑的因素以及UE能力等p 给于UE的UL-SCH的是对应一个UE的，而不是对应一个RB的TECHNOLOGIES CO.,.Page 42通信网PDF created with FinePrint