文件名称：LTE from A-Z 培训教材 （part2 of 3)
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更新时间：2013-06-02 10:51:37
LTE 教材 培训 入门 原理
著名培训机构的LTE培训教材。 深入浅出，从基本概念到深入描述。是一份比较全面的教材。全文367页。有料有内容。是一份难得的教材。 文件比较大，所以拆成3部分。这是part2 LTE from A-Z Technology and Concepts of the 4G 3GPP Standard Table of Content Principles and Motivation of LTE............................................1 1.1 Mobile Radio: Comparison between 3G and 4G..................2 1.1.1 Performance and Mobility Management related Issues..............2 1.1.2 Architecture related Issues..........................................................4 1.1.3 Procedure and Radio related Issues...........................................6 1.2 Requirements on LTE............................................................8 1.2.1 General Requirements................................................................8 1.2.1.1 Support of Enhanced Quadruple Play Services............................10 1.2.1.2 Very High Data Rates @ flexible bandwidth deployment ((1.25) 5 – 20 MHz).....................................................................................................10 1.2.1.3 AIPN and PS services only............................................................10 1.2.2 Important Characteristics of LTE Physical Layer.......................12 1.2.2.1 General Physical Layer Characteristics.........................................12 1.2.2.1.1 OFDM ..................................................................................12 1.2.2.1.2 Scalable Bandwidth..............................................................13 1.2.2.1.3 Smart Antenna Technology..................................................14 1.2.2.1.4 Fast scheduling and AMC.....................................................14 1.2.2.1.5 No Soft(er) handover............................................................14 1.2.3.2 OFDM/OFDMA..............................................................................16 1.2.3.2.1 Traditional narrowband communication................................16 1.2.3.2.2 Problems for wideband signals.............................................17 1.2.3.2.3 OFDM...................................................................................17 1.2.3.2.4 OFDM and OFDMA..............................................................17 1.2.3.2.5 LTE and OFDM.....................................................................17 1.2.3.3 Smart Antenna Technology in LTE................................................18 1.2.3.3.1 Categorization of Smart Antenna Technologies...................18 1.2.3.3.1.1 SISO.............................................................................18 1.2.3.3.1.2 SIMO............................................................................18 1.2.3.3.1.3 MISO............................................................................19 1.2.3.3.1.4 MIMO...........................................................................19 1.2.3.3.2 Multiple Input Multiple Output (MIMO)..................................20 1.2.3.3.2.1 Multiple carrier technology...........................................21 1.2.3.3.2.2 MIMO...........................................................................21 1.2.3.3.3 Adaptive Antenna Systems (AAS)........................................22 1.2.3.3.3.1 Signal generation.........................................................23 1.2.3.3.3.2 Constructive superimposition at the intended receiver 23 1.2.3.3.3.3 Destructive superimposition at the not intended receiver .......................................................................................................23 1.2.3.3.3.4 Generation of signals for multiple UE’s........................23 1.2.3.4 Macro Diversity exploitation by SFN..............................................24 1.2.3.4.1 Requirements for MBMS services........................................24 1.2.3.4.2 MBMS operation with a SFN.................................................24 1.2.3.4.3 SFN for point to point services..............................................25 1.2.3.5 The Frequency Bands Intended for LTE.......................................26 1.2.3.5.1 Exclusive usage....................................................................27 1.2.3.5.2 Refarming.............................................................................27 1.2.3.5.3 Licensed operation................................................................27 1.2.3.5.4 Unlicensed operation............................................................27 1.2.3.6 Flexible Bandwidths, Parameters..................................................28 1.2.3.6.1 Fixed subcarrier separation..................................................28 1.2.3.6.2 Usage of carriers in the middle of the bandwidth for PBCH and synchronization signals.................................................................29 1.2.3.6.3 Deployment Scenarios..........................................................30 1.2.4 Important Characteristics of the LTE Layer 2 and 3..................32 1.2.4.1 Support of the new LTE L1............................................................32 1.2.4.2 Simple IP centric protocols supporting AIPN.................................32 1.2.4.3 Support of various inter RAT handovers (GSM, UTRA, etc.)........33 1.3 LTE and System Architecture Evolution (SAE)..................34 1.3.1 Overview...................................................................................34 1.3.1.1 Missing RNC..................................................................................34 1.3.1.2 Interconnected eNB’s....................................................................35 1.3.1.3 Separate entities for user plane and control plane in the EPC......36 1.3.1.4 Combined Serving Gateway and MME.........................................36 1.3.1.5 Combined Serving and PDN Gateways........................................36 1.3.1.6 S1-flex...........................................................................................36 1.3.1.7 Used legacy elements...................................................................36 1.3.1.8 Roaming case................................................................................36 1.3.1.9 Direct Tunnel.................................................................................36 1.3.1.10 EPS, EPC, E-UTRAN & LTE, SAE..............................................36 1.3.2 The eNB....................................................................................38 1.3.2.1 Selection of MME at attachment....................................................39 1.3.2.2 Scheduling of paging messages....................................................39 1.3.2.3 Routing of user plane data to Serving GW....................................40 1.3.2.4 PDCP.............................................................................................40 1.3.2.5 RRM/RRC......................................................................................40 1.3.2.6 RLC...............................................................................................40 1.3.2.7 MAC...............................................................................................40 1.3.2.8 Complete L1 functionality..............................................................40 1.3.3 The MME...................................................................................42 1.3.3.1 NAS signalling...............................................................................42 1.3.3.2 Inter CN node signaling (3GPP networks).....................................42 1.3.3.3 Security management....................................................................42 1.3.4 The Serving GW........................................................................44 1.3.4.1 Termination of U-plane packets for paging reasons......................44 1.3.4.2 Support of UE mobility anchoring by switching U-plane during inter eNB handover............................................................................................44 1.3.4.3 Transport Packet Marking According to QCI.................................45 1.3.4.4 Mobility anchoring for inter-3GPP mobility....................................45 1.3.4.5 Packet routing and forwarding.......................................................45 1.3.4.6 Charging support...........................................................................45 1.3.4.7 Lawful interception.........................................................................45 1.3.5 The PDN GW............................................................................46 1.3.5.1 Termination towards of PDN’s.......................................................46 1.3.5.2 Policy enforcement........................................................................46 1.3.5.3 Charging support...........................................................................46 1.3.5.4 DHCPv4 and DHCPv6 functions...................................................47 1.3.6 Identifiers of the UE and the Network Elements........................48 1.3.6.1 PLMN ID........................................................................................50 1.3.6.2 EPS Bearer ID...............................................................................50 1.3.6.3 MMEI.............................................................................................50 1.3.6.4 GUMMEI........................................................................................50 1.3.6.5 Physical Cell ID.............................................................................50 1.3.6.6 eNB/cell ID.....................................................................................50 1.3.6.7 TAI.................................................................................................50 1.3.6.8 C-RNTI..........................................................................................50 1.3.6.9 RA-RNTI........................................................................................50 1.3.6.10 SI-RNTI........................................................................................50 1.3.6.11 P-RNTI.........................................................................................50 1.3.6.12 Random Value.............................................................................50 1.3.6.13 IMSI, S-TMSI, and IMEI...............................................................52 1.3.6.14 GUTI............................................................................................52 1.3.6.15 eNB S1-AP UE ID and MME S1-AP UE ID.................................52 1.4 The E-UTRAN Protocol Stack..............................................54 1.4.1 Control Plane Protocol Stack....................................................54 1.4.1.1 Air Interface protocols....................................................................55 1.4.1.2 NAS protocols................................................................................56 1.4.2 User Plane Protocol Stack........................................................58 1.4.2.1 Air Interface protocols....................................................................58 1.4.2.2 S1 protocol....................................................................................58 1.4.3 X2 Interface Control Plane Protocol Stack................................60 1.4.4 X2 User Plane Protocol Stack...................................................62 1.5 Overview Channels of E-UTRAN.........................................64 1.5.1 Channel Types..........................................................................64 1.5.1.1 Logical Channels...........................................................................64 1.5.1.2 Transport Channels.......................................................................64 1.5.1.3 Physical Channels.........................................................................65 1.5.2 Logical Channels of E-UTRAN..................................................66 1.5.2.1 BCCH............................................................................................66 1.5.2.2 PCCH............................................................................................66 1.5.2.3 CCCH............................................................................................66 1.5.2.4 MCCH............................................................................................66 1.5.2.5 DCCH............................................................................................67 1.5.2.6 DTCH.............................................................................................67 1.5.2.7 MTCH............................................................................................67 1.5.3 Transport Channels of E-UTRAN..............................................68 1.5.3.1 RACH............................................................................................68 1.5.3.2 UL-SCH.........................................................................................68 1.5.3.3 BCH...............................................................................................68 1.5.3.4 PCH...............................................................................................68 1.5.3.5 MCH..............................................................................................69 1.5.3.6 DL-SCH.........................................................................................69 1.5.4 Physical Channels of E-UTRAN................................................70 1.5.4.1 PBCH.............................................................................................70 1.5.4.2 PDCCH..........................................................................................70 1.5.4.3 PCFICH.........................................................................................71 1.5.4.4 PUCCH..........................................................................................71 1.5.4.5 PRACH..........................................................................................71 1.5.4.6 PHICH...........................................................................................72 1.5.4.7 PDSCH..........................................................................................72 1.5.4.8 PMCH............................................................................................72 1.5.4.9 PUSCH..........................................................................................72 1.5.4.10 Downlink reference signal...........................................................72 1.5.4.11 Primary and secondary synchronization signal...........................72 1.5.4.12 Uplink reference signal or UL pilot symbol..................................72 1.5.4.13 Uplink sounding signal.................................................................72 1.5.4.14 Random Access Preamble..........................................................72 1.5.5 Mapping of Channels in E-UTRAN............................................74 1.6 Key Development Trends manifested in LTE.....................76 1.6.1 Mapping of User Plane Packets to the Resources....................76 1.6.1.1 Method 1: Fast resource allocation on optimum resources...........77 1.6.1.2 Method 2: Slow resource allocation on suboptimum resources....78 1.6.1.3 GSM..............................................................................................78 1.6.1.4 WCDMA.........................................................................................78 1.6.1.5 HSPA.............................................................................................78 1.6.1.6 LTE................................................................................................78 1.6.1.7 General trend.................................................................................78 1.6.2 All IP Network and Simple Packet Service Driven Protocols.....80 1.6.2.1 Reduced User Plane Latency........................................................82 1.6.2.1 Reduced Control Plane Latency....................................................84 1.7 LTE Key Feature Summary..................................................86 1.7.1 Air Interface Technology...........................................................86 1.7.2 System Architecture..................................................................87 1.7.3 Service Aspects........................................................................87 Key Technologies of the LTE Physical Layer......................89 2.1 Introduction OFDM Technology..........................................90 2.1.1 Impact of Orthogonality in the Frequency Domain – 3 Steps....90 2.1.2 Practical Exercise: Physical Basics of OFDM / OFDMA...........96 2.1.3 Practical Exercise: Scaling of OFDM / OFDMA-Systems..........98 2.1.4 The In-Phase – Quadrature (I/Q) Presentation.......................100 2.1.5 OFDM / OFDMA and IFFT......................................................102 2.1.5.1 Considering the Discrete Oscillator Array Option........................103 2.1.5.2 Details of the IFFT Option...........................................................103 2.1.5.3 Why is it called F a s t Fourier Transformation?..........................103 2.1.6 Modulation Scheme Overview.................................................104 2.1.8 Tackling Inter-Symbol Interference (ISI)..................................108 2.1.8.1 Introduction..................................................................................108 2.1.8.1.1 Delay Spread......................................................................108 2.1.8.2 Cyclic Prefix.................................................................................110 2.1.8.2.1 Variable Duration and other Assets of the Cyclic Prefix.....111 2.1.8.2.2 Cyclic Prefix in OFDMA in LTE...........................................111 2.1.9 Layout of a Typical OFDM System..........................................112 2.1.9.1 Remarks on the Brick Wall Image...............................................113 2.1.9.2 Subchannelization ......................................................................113 2.1.9.3 Pilot Subcarriers..........................................................................113 2.1.9.4 Null Subcarriers...........................................................................113 2.2 Introduction to MIMO Technology....................................114 2.2.1 The Basics: Signal Fading Physics between TX and RX........114 2.2.2 Multiplexing Dimensions.........................................................116 2.2.2 Multiplexing Dimensions.........................................................118 2.2.3 The Multipath Dimension........................................................120 2.2.6 MIMO General Operation........................................................122 The Physical Layer of E-UTRAN..........................................125 3.1 The Use of OFDM/OFDMA in LTE.....................................126 3.1.1 Frame Structure......................................................................126 3.1.1.1 The generic frame structure........................................................126 3.1.1.2 The downlink slots.......................................................................127 3.1.1.3 The uplink slots............................................................................127 3.1.1.4 The frame structure type 2..........................................................127 3.1.2 LTE Parameters......................................................................128 3.1.2.1 The normal configuration.............................................................128 3.1.2.2 The extended configuration with 15 kHz subcarrier separation...128 3.1.2.3 The extended configuration with 7.5 kHz subcarrier separation..129 3.1.2 Resource Element and Resource Block Definition..................130 3.1.2.1 Definition Resource Element.......................................................130 3.1.2.2 Definition Resource Block...........................................................130 3.1.2.3 Definition Subframe.....................................................................130 3.1.2.4 Number of resource blocks in a given bandwidth........................131 3.1.3 Choice of the UL Transmission Scheme (UL Data Symbols only) .........................................................................................................132 3.1.3.1 What would happen if OFDM would be used in the UL...............133 3.1.3.2 SC-FDMA is used for the UL.......................................................133 3.1.4 FDD and TDD Operation in E-UTRAN....................................134 3.1.4.1 Reciprocity...................................................................................134 3.1.4.1.1 Reciprocity of the mobile radio channel..............................134 3.1.4.1.2 Speed of scheduling decisions...........................................135 3.1.4.2 UL / DL Asymmetry and Others...................................................136 3.1.4.2.1 UL/DL symmetry.................................................................136 3.1.4.2.2 Interference scenarios........................................................136 3.1.4.2.3 TRX architecture.................................................................137 3.1.4.2.4 Deployment in a given frequency band...............................137 3.1.4.3 Summary FDD vs. TDD...............................................................138 3.2 The DL Physical Channels and their Frame Structures. .140 3.2.1 Allocation of DL Physical Channels to Resource Elements....140 3.2.1.1 Not used subcarriers...................................................................142 3.2.1.2 Primary Synchronization Signal...................................................142 3.2.1.3 Secondary Synchronization Signal..............................................142 3.2.1.4 Pilot or Reference Signal.............................................................142 3.2.1.5 PBCH...........................................................................................142 3.2.1.6 PCFICH.......................................................................................142 3.2.1.7 PHICH.........................................................................................142 3.2.1.8 PDCCH........................................................................................142 3.2.1.9 PDSCH (and PMCH)...................................................................142 3.2.2 System Information on PBCH and PDSCH.............................144 3.2.2.1 Split of the BCH on the PBCH and the PDSCH..........................144 3.2.3 PCFICH, PDCCH, and PHICH................................................146 3.2.3.1 The PCFICH................................................................................147 3.2.3.2 The PDCCH.................................................................................148 3.2.3.3 The PHICH..................................................................................148 3.2.4 The Downlink Processing Chain.............................................150 3.2.4.1 Encoded transport block bits.......................................................150 3.2.4.2 Scrambling...................................................................................150 3.2.4.3 Modulator.....................................................................................152 3.2.4.4 Layer Mapper..............................................................................152 3.2.4.5 Precoding....................................................................................152 3.2.4.6 OFDM signal generation..............................................................152 3.2.4.7 CP and IFFT................................................................................152 3.3 The UL Physical Channels and their Frame Structures. .154 3.3.1 Overview UL Physical Channels (RRC_CONNECTED).........154 3.3.1.1 Scheduling Request (SR) on the PUCCH...................................154 3.3.1.2 Small amount of L1 information on the PUCCH..........................155 3.3.1.3 Big amount of L1 information on the PUSCH..............................155 3.3.1.4 L1 information on the PUSCH multiplexed with the TrCH data...155 3.3.1.5 Sounding reference symbols PUSCH resources.........................155 3.3.2 Overview PUCCH...................................................................156 3.3.3 PUCCH Mapping for ACK/NACK only and Scheduling Request .........................................................................................................158 3.3.3.1 Usage of Zadoff-Chu sequences.................................................158 3.3.3.2 Spreading of repeated data Zadoff-Chu symbols........................160 3.3.3.3 Spreading of reference Zadoff-Chu symbols...............................160 3.3.3.3 PUCCH Format 1........................................................................160 3.3.3.4 PUCCH Formats 1a and 1b.........................................................160 3.3.3.5 Shortened PUCCH Formats 1a and 1b.......................................160 3.3.3.6 Multiple access of the PUCCH....................................................160 3.3.4 Shared usage of Resources with CAZAC Sequences............162 3.3.4.1 Zadoff-Chu sequences are CAZAC sequences..........................163 3.3.4.2 Separation of different UE’s with cyclic shifted Zadoff-Chu sequences...............................................................................................163 3.3.5.1 PUCCH Format 2........................................................................164 3.3.5.2 PUCCH Formats 2a and 2b.........................................................165 3.3.6 The Uplink Processing Chain..................................................166 3.3.6.1 Transport block bits.....................................................................166 3.3.6.2 Scrambling...................................................................................166 3.3.6.3 Modulator.....................................................................................166 3.3.6.4 DFT pre-coder.............................................................................166 3.3.6.5 Demultiplexing of signals other than data....................................167 3.3.6.6 Resource element mapper..........................................................167 3.3.6.7 IFFT.............................................................................................167 3.3.6.7 CP................................................................................................167 3.4 Overview all Physical Channels........................................168 3.4.1 Special usage of the 6 RB around the DC carrier...................169 3.4.2 Multiplexing of the PCFICH, PDCCH and the PDSCH/PMCH in the normal DL subframe...................................................................170 3.4.3 Sounding reference signal.......................................................170 3.4.4 Modulation of the physical channels.......................................170 3.4.5 Channel coding.......................................................................170 3.5 Physical Layer Procedures...............................................172 3.5.1 Timing Advance Control..........................................................174 3.5.1.1 Principle.......................................................................................174 3.5.1.2 Procedure....................................................................................178 3.5.1.2.1 TA while the UE is not synchronized to the eNB................178 3.5.1.2.2 TA while the UE is synchronized to the eNB......................179 3.5.2 Channel Estimation DL...........................................................180 3.5.2.1 Channel Estimation Principle of LTE...........................................180 3.5.2.1.1 The description of the mobile radio channel.......................180 3.5.2.1.2 Coping with a frequency selective mobile radio channel....182 3.5.2.2 Channel Estimation Downlink......................................................184 3.5.2.2.1 Normal configuration with 4 TX antennas...........................184 3.5.2.2.2 Normal configuration with less than 4 TX antennas...........185 3.5.2.2.3 Extended configuration with 15 kHz subcarrier spacing.....185 3.5.2.2.4 Extended configuration with 15 kHz subcarrier spacing for MBSFN..............................................................................................185 3.5.2.2.5 Extended configuration with 7.5 kHz subcarrier spacing for MBSFN..............................................................................................185 3.5.3 Power Control Principle (PUSCH)...........................................186 3.5.4.1 The Transmission Diversity Problem...........................................188 3.5.4.1.1 Receive diversity.................................................................188 3.5.4.1.2 Unsuccessful transmit diversity...........................................189 3.5.4.2 AAS in LTE............................................................................190 3.5.4.2.1 Practical Exercise: Draw the Antenna Diagram of AAS......192 3.5.4.3 CDD.............................................................................................194 3.5.4.3.1 Delay diversity.....................................................................194 3.5.4.3.2 Cyclic delay diversity...........................................................194 3.5.4.3.3 Cyclic delay diversity and MIMO.........................................195 3.5.4.4 SFBC...........................................................................................196 3.5.4.4.1 Space Frequency Block Codes...........................................197 3.5.4.4.2 Space Time Block Codes....................................................197 3.5.4.5 MIMO...........................................................................................198 3.5.4.5.1 MIMO and AAS combined = multiple rank beamforming....199 3.5.4.5.2 When MIMO fails................................................................199 3.5.4.6 The Codebook.............................................................................200 3.5.4.6.1 Optimum beamforming weights..........................................201 3.5.4.6.2 Signaling of sub-optimum beamforming weights................201 3.5.5 Initial Cell Search ...................................................................202 3.5.5.1 Primary and Secondary Synchronization Signals........................202 3.5.5.2 Procedure....................................................................................204 3.5.6 Random Access......................................................................206 3.5.6.1 PRACH Structure Format 0.........................................................206 3.5.6.2 Random Access Procedure.........................................................208 3.5.7 Inter Cell Interference Mitigation.............................................210 3.5.7.1 Traditional frequency reuse in LTE..............................................210 3.5.7.1.1 Frequency reuse bigger than 1...........................................211 3.5.7.1.2 Frequency reuse 1 with low initial load...............................211 3.5.7.1.3 Frequency reuse 1 strongly increased load........................211 3.5.7.1.4 Frequency reuse 1 after “the party”....................................211 3.5.7.2 Fractional Frequency Reuse with Intercell Interference Coordination............................................................................................212 3.6 UE Classes..........................................................................214 3.6.1 Overview.................................................................................214 3.6.1.1 Classes 1-4..................................................................................214 3.6.1.2 UE class 5...................................................................................215 3.6.2 Calculation of the DL Peak Throughput for LTE UE Class 5...216 The Higher Layers of E-UTRAN...........................................219 4.1 Overview.............................................................................220 4.1.1 E-UTRAN Architecture Control Plane.....................................220 4.1.2 E-UTRAN Architecture User Plane.........................................222 4.2 Features of MAC.................................................................224 4.2.1 Overview.................................................................................224 4.2.1.1 Data transfer logical channels ←→ transport channels..............224 4.2.1.2 Radio resource allocation............................................................224 4.2.2 MAC Random Access Procedure............................................226 4.2.2.1 Contention based random access procedure..............................226 4.2.2.2 Non-contention based random access procedure.......................227 4.2.3 Structure of MAC-PDU............................................................228 4.2.3.1 MAC control element...................................................................229 4.2.3.2 Normal MAC SDU.......................................................................229 4.2.4 MAC Control Elements............................................................230 4.2.4.1 Contention resolution ID..............................................................231 4.2.4.2 Timing Advance...........................................................................231 4.2.4.3 DRX.............................................................................................231 4.2.4.4 Padding.......................................................................................231 4.2.4.5 Short, long and truncated buffer status reports...........................231 4.3 Features of RLC.................................................................232 4.3.1 Overview.................................................................................232 4.3.1.1 Data transfer................................................................................232 4.3.1.2 Error detection and recovery.......................................................232 4.3.1.3 Reset...........................................................................................233 4.3.2 Structure of RLC PDU.............................................................234 4.3.3 Structure of RLC AM with PDCP PDU Segments...................236 4.4 Features of PDCP...............................................................238 4.4.1 Overview.................................................................................238 4.4.1.1 RoHC...........................................................................................238 4.4.1.2 Numbering of PDCP PDU’s.........................................................238 4.4.1.3 In-sequence delivery of PDU’s....................................................238 4.4.1.4 Duplicate deletion........................................................................238 4.4.1.5 Encryption....................................................................................239 4.4.1.6 Integrity Protection.......................................................................239 4.4.2 Structure of PDCP PDU..........................................................240 4.5 Features of RRC.................................................................242 4.5.1 Overview.................................................................................242 4.5.1.1 Transmission of broadcast information........................................243 4.5.1.2 Establish and maintain services..................................................243 4.5.1.3 QoS control..................................................................................243 4.5.1.4 Transfer of dedicated control information....................................243 4.5.2 State Characteristics of RRC..................................................244 4.5.2.1 RRC_IDLE...................................................................................244 4.5.2.2 RRC_CONNECTED....................................................................244 4.6 NAS Protocol States and Transitions...............................246 4.6.1 EMM-DEREGISTERED & ECM-IDLE.....................................246 4.6.2 EMM-REGISTERED & ECM-IDLE..........................................246 4.6.3 EMM-REGISTERED & ECM-CONNECTED...........................247 4.7 Mobility...............................................................................248 4.7.1 Mobility Management in the EMM-DEREGISTERED & ECMIDLE State........................................................................................248 4.7.2 Mobility Management in the EMM-REGISTERED & ECM-IDLE State.................................................................................................250 4.7.3 Mobility Management in the EMM-REGISTERED & ECMCONNECTED State.........................................................................252 4.7.4 Inter RAT Mobility Management..............................................254 4.7.4.1 Cell Reselection (EMM-REGISTERED & ECM-IDLE).................255 4.7.4.2 Handover (EMM-REGISTERED & ECM-CONNECTED)............255 4.8 QoS in LTE..........................................................................256 4.8.1 Bearer Architecture.................................................................256 4.8.2 QoS Parameters.....................................................................258 4.8.2.1 ARP.............................................................................................259 4.8.2.2 Label............................................................................................259 4.8.2.3 GBR.............................................................................................259 4.8.2.4 MBR.............................................................................................259 4.8.2.5 AMBR..........................................................................................259 4.8.3 QoS Classes Identifier............................................................260 4.9 Security in LTE...................................................................262 Selected E-UTRAN Scenarios..............................................265 5.1 Initial Context Setup Procedure........................................266 5.2 Tracking Area Update........................................................268 5.1.1 Inter MME tracking area update..............................................268 5.1.2 Intra MME tracking area update..............................................269 5.3 PDP Context Establishment..............................................270 5.4 Intra MME Handover...........................................................274 5.4.1 Practical Exercise: Intra eNB Handover..................................278 5.5 Inter MME Handover...........................................................280 5.6 How a TCP/IP MTU is reaching the UE / the Internet.......284 5.6.1 TCP/IP layer............................................................................284 5.6.2 PDCP layer.............................................................................284 5.6.3 RLC layer................................................................................284 5.6.4 MAC layer...............................................................................285 5.6.5 PHY layer................................................................................285 Solutions for Practical Exercises........................................287