pdf_gross.gifGPRS - Signaling & Protocol Analysis
(RAN and Mobile Station)

backtotop.gifA Comprehensive Inside View on GPRS

Course Description

  • Access and Core Network Architecture with Release 5
    • Overview
  • Introducing the GPRS Network Architecture
  • Tasks and Functions of the PCU
    • Conversion of Packet Data into PCU-Frames
    • Responsibility for RLC/MAC on the Network Side
  • Tasks and Functions of the SGSN
    • Routing of Data Packets between the GGSN and the various BSS’s (<-> Packet Switching)
    • GPRS-Mobility Management
    • GPRS-Session Management
    • Ciphering
    • Charging (own network resources)
    • Data Compression (<-> V.42bis)
    • TCP/IP Header Compression (<-> RFC 1144)
    • TCP/IP und UDP Header Compression (<-> RFC 2507)
  • Tasks and Functions of the GGSN
    • Interface between the PLMN and external Packet Data Networks
    • Anchor Function for Packet Data Transfer
    • Charging (foreign network resources)
  • There are Different Types of GGSN’s
    • GGSN Type A (Transparent Access)
    • GGSN Type B (Non-Transparent Access)
    • GGSN Type C (Corporate GGSN)
  • Tasks and Functions of the BG
    • Interface for Packet Data Transmission between PLMN’s
  • The Mobile Station in GPRS
    • Mobile Station Class A
      Characteristics of Dual Transfer Mode (DTM) ,Realization of the GPRS Mobile Station, Class A in “Simple Form”, Shared Use Operation Mode, Single Slot Operation Mode, Multi-Slot Operation Mode
    • Mobile Station Class B
    • Mobile Station Class C
  • The Different Multislot Classes
    • Multislot Class Type
    • Max No of Receive Timeslots / Max No of Transmit Timeslots / Sum
    • Timing Constraints
      Receive : 1 Transmit – Configuration, Receive : 3 Transmit - Configuration
  • Additional Multislot Classes 30 – 45 with Release 5
    • The Timing Advance Offset
    • Example: Operation of Multislot Class 40
  • The Frame Hierarchy
    • The 26-Multiframe
    • The 51-Multiframe
    • The 52-Multiframe
  • The 52-Multiframe in Detail
    • 12 Radio Blocks for the different Packet Data Channels (PDCH)
    • The Radio Blocks are organized in the Ordered List of Blocks
  • Packet Data Channels (PDCH) in GPRS
    • PDCH’s are Logical Channels
    • PBCCH (Packet Broadcast Control Channel)
    • PCCCH (Packet Common Control Channel)
    • PRACH (Packet Random Access Channel)
    • PAGCH (Packet Access Grant Channel)
    • PPCH (Packet Paging Channel)
    • PNCH (Packet Notification Channel)
    • PDTCH (Packet Data Traffic Channel)
    • PACCH (Packet Associated Control Channel)
    • PTCCH (Packet Timing Advance Control Channel)
  • The Continuous Timing Advance Update Procedure
    • Timing Advance Control in GSM
      Example for the allocation of the PACKET TIMING ADVANCE Information Element
    • The Timing Advance - Message
    • Usage of the Downlink PTCCH (PTCCH/D)
    • Liabilities of the Continuous TA Update Procedure
  • Timing Advance Control Using Polling
  • The Different Network Operation Modes
    • Network Operation Mode I (NOM I)
    • Network Operation Mode II (NOM II)
    • Network Operation Mode III (NOM III)
  • The Coding Schemes 1 - 4 in GPRS
    • Details of CS-1
      Initial Situation, Step 1: Block Coding & Tail Bits, Step 2: Convolutional Coding, Step 3: Interleaving
    • Details of CS-2 and CS-3
      Initial Situation, Step 1: Precoding of the first 3 Bits of the MAC-Header, Step 2: Parity, Tail Bits, Step 3: Convolutional Coding, Step 4: Puncturing, Step 5: Interleaving
    • Puncturing
      Puncturing in GSM, Introduction to Puncturing, The Perspective of the Receiver
    • Details of CS-4
      Initial Situation, Step 1: Precoding of the first 3 Bits of the MAC-Header, Step 2: Parity, Tail Bits, Step 3: No Convolutional Coding, Step 4: Interleaving
    • Why is USF-Precoding done for CS-2, CS-3 and CS-4 ?
    • The Stealing Flags identify the Coding Scheme
    • Transmission Rates for CS-1 to CS-4
    • Transmission Rates and Timeslot Bundling
  • The GPRS Protocol Stack between MS and Application
  • Iu mode
    • GERAN – Core Network Interfaces with Release 5
      Iu mode – the Principle
  • GERAN in Iu mode connected to PS Domain
    • User Plane, Control Plane
    • Main Functions of the RRC Layer
    • Physical Channels in Iu mode
      Dedicated Basic Physical SubChannel (DBPSCH), Shared Basic Physical SubChannel (SBPSCH)
    • Logical Channels on DBPSCH
    • Logical Channel Combinations on a BPSCH
    • Protocol Stack Configuration for User Plane Data over Iu-PS
      Example: Bearer ↔ Logical ↔ Physical Channel Mapping
    • RRC Modes
      Idle State, Cell_Dedicated State, Cell_Shared State, GRA_PCH State
    • Intra GERAN, inter GERAN – UTRAN interface
      GERAN Registration Area, New Identifier in Iu mode, S-RNTI, G-RNTI
  • Flexible Iu Connection
    • Flexible Iu Interface with Release 5
      Packet Switched Pool Areas, Circuit Switched Pool Areas, CN Node Selection Cycle, NRI transmission in A/Gb mode, NRI transmission in Iu mode
    • Affected Network Nodes
      Network Configuration Example

backtotop.gifGPRS Mobility Management (GMM)

  • Introduction to GPRS Mobility Management
    • Intra-PLMN and Inter-PLMN Roaming
    • GMM States in the SGSN and the Mobile Station
      The IDLE-State, The READY-State, The STANDBY-State
  • New Identifiers and Parameters with GMM
    • The Routing Area and the Null Routing Area
    • The Routing Area Identification (RAI)
    • The Routing Area Color Code (RACC)
    • The P-TMSI and the P-TMSI Signature
    • The P-TMSI and the TLLI (Temporary Logical Link Identifier)
      Local TLLI, Foreign TLLI, Random TLLI, Auxiliary TLLI (historic)
    • The Ready Timer (T3314)
      Operation of the Ready Timer (T3314) if Cell Notification is not supported, Operation of the Ready Timer (T3314) if Cell Notification is supported, Implications of the Ready Timer, Specific Settings of the Ready Timer (T3314)
    • Periodic Routing Area Updating Timer (T3312) & Mobile Reachable Timer
      Expiry of T3312 in MS, Allocation of T3312 and Mobile Reachable Timer, Operation of T3312 and Mobile Reachable Timer, Expiry of Mobile Reachable Timer
  • The GMM-Messages
    • Message Format for GMM and SM
    • The GMM-Message Types
      ATT_REQ, ATT_ACC, ATT_COM, ATT_REJ, DET_REQ, DET_ACC, RA_UPD_REQ, RA_UPD_ACC, RA_UPD_COM, RA_UPD_REJ, P-TMSI_REAL_CMD, P-TMSI_REAL_COM, AUTH_CIPH_FAIL, AUTH_CIPH_REQ, AUTH_CIPH_RSP, AUTH_CIPH_REJ, IDENT_REQ, IDENT_RSP, GMM_STATUS, GMM_INFO
  • GMM-Procedures
    • The Relationship Between RLC/MAC and GMM/SM-Procedures
    • GPRS Attach ( new SGSN / NOM II / III, MS Class A, B or C)
      Initial Conditions, Applicability of this Procedure, Description
    • Combined Attach (no new SGSN, MS Class A or B)
      Initial Conditions, Applicability of this Procedure, Description
    • The Cell Update Procedure
      Initial Conditions, Applicability of this Procedure, Description
    • Combined RA / LA Update (Intra SGSN / MS-Class A or B)
      Initial Conditions, Applicability of this Procedure, Description
    • Inter SGSN Routing Area Update (Packet Transfer Mode)
      Initial Conditions, Applicability of this Procedure, Description
    • The GPRS Detach Procedure (Mobile Originating)
      Initial Conditions, Applicability of this Procedure, Description
    • The GPRS Detach Procedure (SGSN Originating)
      Initial Conditions, Applicability of this Procedure, Description
    • The GPRS Detach Procedure (HSS Originating)
      Initial Conditions, Applicability of this Procedure, Description
  • Real Life Recordings / Periodic Routing Area Updating
    • Unsuccessful GPRS Attach

backtotop.gifSession Management (SM)

  • Parameters of Session Management
    • Applicability of the QoS-Profile
    • The QoS-Parameters in Release ’99 and beyond
    • The Traffic Classes
      Conversational Class, Streaming Class, Interactive class, Background class, Relationship between QoS-Profile and Application, The File Transfer Protocol (FTP), Voice over IP (VoIP), The Packet Flow Context (PFC) and the Packet Flow Identifier (PFI)
    • The Different PDP-Types
    • The Access Point Name (APN)
      The Network Identifier, The Operator Identifier, Example: Network Selection with APN = “*” and PDP-Type = IP, Example: Network Selection with APN = “WAP” and PDP-Type = IP, Example: Network Selection without provision of APN or PDP-Type, Example: Network Selection with APN = “UUDIAL.NET” (or without provision of APN) and PDP-Type = PPP
    • Protocol Configuration Options
    • PDP-Context Parameter Storage
    • Message Format for SM
    • The SM-Message Types
      ACT_PDP_CT_REQ, ACT_PDP_CT_ACC, ACT_PDP_CT_REJ, REQ_PDP_CT_ACT, REQ_PDP_CT_ACT_REJ, DEACT_PDP_CT_REQ, DEACT_PDP_CT_ACC, MOD_PDP_CT_REQ (SGSN => MS), MOD_PDP_CT_ACC (MS => SGSN), MOD_PDP_CT_REQ (MS => SGSN), MOD_PDP_CT_ACC (SGSN => MS), MOD_PDP_CT_REJ, ACT_SEC_PDP_CT_REQ, ACT_SEC_PDP_CT_ACC, ACT_SEC_PDP_CT_REJ, SM_STATUS
  • Transparent Access to the Internet / Intranet
    • Network Configuration after Transparent Access
  • Non-Transparent Access to the Internet / Intranet
    • Network Configuration after Non-Transparent Access
  • Session Management Procedures
    • The Operation of Session Management Procedures
    • The Mobile Originating PDP-Context Activation Procedure
      Initial Conditions, Applicability of this Procedure, Description
    • The Secondary PDP-Context Activation Procedure
      Initial Conditions, Applicability of this Procedure, Description, Meaning of TFT during Secondary PDP Context Activation
    • The Mobile Terminating PDP-Context Activation Procedure
      Initial Conditions, Applicability of this Procedure, Description
    • PDP-Context Deactivation – Mobile Originating
      Initial Conditions, Applicability of this Procedure, Description
    • PDP-Context Deactivation – SGSN Originating
      Initial Conditions, Applicability of this Procedure, Description
    • PDP-Context Deactivation – GGSN Originating
      Initial Conditions, Applicability of this Procedure, Description

backtotop.gifRadio Link Control / Medium Access Control (RLC / MAC)

  • The Code Syntax Notation 1 (CSN.1)
    • Important Rules of CSN.1
    • Example for CSN.1 Encoding
  • Tasks and Functions of Medium Access Control (MAC)
    • The One-Phase and the Two Phase Packet Access Procedure
  • Access Mechanisms on CCCH
    • One-Phase Packet Access on CCCH in Detail
      Initial Conditions, Applicability of this Procedure, Description
    • Example for One-Phase Packet Access
    • Two-Phase Packet Access on CCCH in Detail
      Initial Conditions, Applicability of this Procedure, Description
  • Access Mechanisms on PCCCH
    • One-Phase Packet Access on PCCCH in Detail
      Initial Conditions, Applicability of this Procedure, Description
    • Two-Phase Packet Access on PCCCH in Detail
      Initial Conditions, Applicability of this Procedure, Description
  • Temporary Block Flow and Temporary Flow Identity
    • Introduction
    • Constraints of the TFI
      Example
    • Multiple Temporary Block Flows (TBF) in Iu mode
  • Resource Allocation Methods
    • The Dynamic Resource Allocation Method
      PACK_UL_ASS-Message with Dynamic Allocation, Problems of Dynamic Allocation
    • The Extended Dynamic Resource Allocation Method
      Operation of Extended Dynamic Allocation
  • Cell Reselection and Cell Updating
    • GMM Standby State / NC0, NC1 or NC2
      GMM Ready State / NC0, GMM Ready State / NC1, GMM Ready State / NC2
    • Network Assisted Cell Change (NACC)
      Characteristics, Inform Mobile Station about NACC-Capability, Operation of NACC
  • BSS-based Paging Coordination
    • Introduction
    • Detailed Operation
  • Uplink Resource Release
    • Options
    • Overview of the Uplink Resource Release Procedure
    • Overview
    • The Countdown Procedure
    • Different Formats of the PACK_CTRL_ACK-Message
    • Uplink Resource Release (Non-Extended / Normal Case)
      RLC Acknowledged Operation Mode, RLC Unacknowledged Operation Mode
    • Uplink Resource Release (Non-Extended / Abnormal Case)
      RLC Acknowledged Operation Mode, RLC Unacknowledged Operation Mode
    • Release Procedure with Extended Uplink TBF Operation
  • Downlink Resource Release
    • Overview of the Downlink Resource Release Procedure
    • Downlink Resource Release (Immediate / Normal Case)
    • Downlink Resource Release (Immediate / Abnormal Case)
    • Details of Delayed Downlink TBF Release
  • Tasks and Functions of Radio Link Control (RLC)
    • Segmentation and De-Segmentation of LLC-PDU’s
    • Downlink TBF Operation (Normal)
    • Downlink TBF Operation (Abnormal)
    • Uplink TBF Operation / Acknowledged Mode (Normal)
    • Uplink TBF Operation / Acknowledged Mode (Abnormal)
    • Operation of N3102, PAN_MAX, PAN_DEC and PAN_INC
      The Relationship between N3102 and PAN_MAX, Long Term Operation of N3102, PAN_DEC and PAN_INC, PAN_INC, PAN_DEC and PAN_MAX in a Real Life Recording
  • Uplink Power Control
    • Important Characteristics
    • Formula and Important Power Control Parameters
      GAMMA (0) <-> (0), GAMMA (TS) <-> (<-> TS), ALPHA <-> a, C-Value
    • Consideration of the Downlink Pathloss
      Smoothing the Downlink Signal Strength Values
    • Operation of Uplink Power Control (Example)
    • Real Life Settings of Uplink Power Control Parameters
  • Downlink Power Control
    • Initial Considerations
    • Power Reduction Modes
      Power Reduction Mode A, Power Reduction Mode B
  • The RLC / MAC Frame Structure
    • Format of the RLC / MAC Downlink Data Block
      Example of an RLC/MAC Downlink Data Block
    • Format of the RLC / MAC Uplink Data Block
      Example of an RLC/MAC Uplink Data Block
    • Format of the RLC / MAC Downlink Control Block
      Example of an RLC/MAC Downlink Control Block
    • Format of the RLC / MAC Uplink Control Block
      Example of an RLC/MAC Uplink Control Block
    • The Uplink State Flag (USF)
    • The Supplementary / Polling Bit (S/P-Bit)
    • The Relative Reserved Block Period Field (RRBP)
    • The Payload Type Field
    • The Retry Bit (R-Bit)
    • The Stall Indicator Bit (SI-Bit)
    • The Countdown Value (CV)
    • The Final Block Indicator Bit (FBI-Bit)
      Example for the Operation of the FBI-Bit
    • The TLLI Indicator Bit (TI-Bit)
    • The Temporary Flow Identity Field (TFI-Field)
    • The Power Reduction Field (PR-Field)
    • The Block Sequence Number (BSN)
    • The Extension Bit in the Mandatory Part of the RLC-Header
    • The Extension-Bit, the More-Bit and the Length Indicator-Field
      Example 1: Three LLC PDU Segments in One RLC Data Block, Example 2: Two LLC-PDU Segments in One RLC Data Block
    • The Address Control Bit (AC-Bit)
    • The Final Segment Bit (FS-Bit)
    • The Radio Transaction Identifier Field (RTI-Field)
    • The Reduced Block Sequence Number Bit (RBSN-Bit)
      Example for the Operation of RTI, RBSN and FS
    • The Direction Bit (D-Bit)
      Example for the Operation of the D-Bit
    • The RLC/MAC-Message Types
      PACK_CHAN_REQ, HO_ACC (Iu mode only), PACK_CELL_CHANGE_FAIL, PACK_CTRL_ACK, PACK_DL_ACK, PACK_DBPSCH_DL_ACK (Iu mode only), PACK_UL_DUMMY_CTRL_BLK, PACK_MEAS_REP, PACK_RES_REQ, PACK_MOBILE_TBF_STAT, PACK_PSI_STAT, PACK_PAUSE, PACK_ENH_MEAS_REP, ADD_MS_RAD_ACC_CAP (not used in Iu mode), PACK_CCN, PACK_SI_STAT, PACK_CELL_CHANGE_ORDER, PACK_DL_ASS, PACK_MEAS_ORDER, PACK_POLL_REQ, PACK_PWR_CON_TA, PACK_QUEUING_NOT, PACK_TS_RECONF, PACK_TBF_REL, PACK_UL_ACK, PACK_DBPSCK_UL_ACK (Iu mode only), PACK_UL_ASS, PACK_CELL_CHANGE_CON, PACK_NC_DATA, PACK_SC_DATA, PACK_DBPSCH_ASS (Iu mode only), M_TBF_DL_ASS (Iu mode only), M_TBF_UL_ASS (Iu mode only), M_TBF_TS_RECONF (Iu mode only), PHY_INFO (Iu mode only), PACK_ACC_REJ, PACK_PAG_REQ, PACK_PDCH_REL, PACK_PRACH_PARAM, PACK_DL_DUMMY_CTRL_BLK, PACK_SYS_INFO1, PACK_SYS_INFO2, PACK_SYS_INFO3, PACK_SYS_INFO3bis, PACK_SYS_INFO3ter, PACK_SYS_INFO3quarter, PACK_SYS_INFO4, PACK_SYS_INFO5, PACK_SYS_INFO6, PACK_SYS_INFO7, PACK_SYS_INFO8, PACK_SYS_INFO13, PACK_SYS_INFO14, PACK_SYS_INFO15, PACK_SYS_INFO16

backtotop.gifFrame Relay and Network Service (NS)

  • The Protocol Stack on the Gb-Interface
  • Option 1: Network Service based on Frame Relay
  • Introduction to Frame Relay
    • The Frame Relay Network
    • Permanent Virtual Connections
    • The Frame Relay Frame Format
      The Discard Eligibility Bit (DE-Bit), The Performance of a Frame Relay Network, Backward Explicit Congestion Notification (BECN) and Forward Explicit Congestio, Notification (FECN)
    • The Relationship between Network Service and Frame Relay
  • The NS Link Establishment Procedure (Frame Relay specific)
    • Initial Conditions
    • Applicability of this Procedure
    • Description
      Example of a NS-RESET-PDU
    • The NS Link Establishment Procedure (unsuccessful)
      Inconsistency of the NS-VCI and the NS-VC, Inconsistency of the NSEI
  • Option 2: Network Service based on IP
  • The Relationship between Network Service and IP
    • Network Service – Virtual Links (NS-VL)
    • Network Service – Virtual Connection (NS-VC)
  • Procedural Overview of Operating Network Service over IP
    • Obtain IP-Address
    • Size Procedure
    • Configuration Procedure
    • Add-, Delete- and Change Weight Procedure
  • The NS Link Test Procedure
    • Initial Conditions
    • Applicability of this Procedure
    • Description
    • The NS Link Test Procedure (Example)
    • The NS Link Test Procedure (unsuccessful outcome)
  • BSSGP Virtual Connections (BVC)
    • Introducing the NS-VCG and the NSE
    • Introducing the BVC
    • BSSGP Virtual Connection Identifiers (BVCI)
      BVCIs in Intra Domain Connections
  • Network Service PDU-Types
    • NS-UNITDATA, NS-RESET, NS-RESET-ACK, NS-BLOCK, NS-BLOCK-ACK, NS-UNBLOCK, NS-UNBLOCK-ACK, NS-STATUS, NS-ALIVE, NS-ALIVE-ACK, SNS-ACK, SNS-ADD, SNS-CHANGEWEIGHT, SNS-CONFIG, SNS-CONFIG-ACK, SNS-DELETE, SNS-SIZE, SNS-SIZE-ACK

backtotop.gifBase Station System GPRS Protocol (BSSGP)

  • BSSGP Provides Transparent and Non-Transparent Functions
    • Transparent Transfer of LLC-Frames between the PCU and the SGSN
    • Non-Transparent Signaling between the SGSN and the PCU
    • Non-Transparent Signaling related to the management of the Gb-Interface
  • BSSGP in the Protocol Stack on the Gb-Interface
    • The Protocol Stack at the SGSN
    • The Protocol Stack at the PCU
  • Information Transfer on the Gb-Interface
  • Procedures Related to the Transfer of LLC-Frames
    • Provision of the Radio Access Capabilities of the Mobile Station to the PCU
    • Downlink Data Transfer via BSSGP
  • Content of a BSSGP DL-UNITDATA PDU
    • Example of a DL-UNITDATA PDU
    • Uplink Data Transfer via BSSGP
      Content of a BSSGP UL-UNITDATA PDU, Example of an UL-UNITDATA PDU
  • Signaling Procedures Related to GPRS Mobility Management
    • Paging CS / Paging PS
    • Radio Access Capability Update
    • The Suspend and Resume Procedure / First Option
      Initial Conditions, Applicability of this Procedure, Description
    • The Suspend and Resume Procedure / Second Option
      Initial Conditions, Applicability of this Procedure, Description
    • The Radio Status Procedure
      Initial Conditions, Applicability of this Procedure, Description, Example of a RADIO-STATUS PDU
  • Signaling Procedures Related to Network Management (NM)
    • The Trace Procedure
    • The Reset Procedure
      Initial Conditions, Applicability of this Procedure, Description
    • The Blocking and Unblocking Procedures
      Initial Conditions, Applicability of this Procedure, Description
    • The Flush Logical Link Procedure
      Initial Conditions, Applicability of this Procedure, Description, Example of a FLUSH-LL PDU, Example of a FLUSH-LL-ACK PDU
  • Flow Control on the Gb-Interface
    • Flow Control Operation
      Initial Conditions, Applicability of this Procedure, Description, Example of a FLOW-CONTROL-BVC PDU, Example of a FLOW-CONTROL-BVC-ACK PDU, Example of an LLC-DISCARDED PDU
  • Signaling Procedures Related to Packet Flow Management (PFM)
    • Modify BSS PFC
    • Delete BSS PFC
    • The Create BSS Packet Flow Context Procedure
      Initial Conditions, Applicability of this Procedure, Description
  • Signaling Procedures related to Location Services
    • Location Procedure
      Initial Conditions, Applicability of this Procedure, Description
    • Position Command Procedure
      Initial Conditions, Applicability of this Procedure, Description
  • Signaling Procedure for RAN Information Management (RIM)
    • RAN Information Management
    • RIM Application
    • RAN Information Management Procedure
      Initial Conditions, Applicability of this Procedure, Description, Example: RAN-INFORMATION PDU
  • BSSGP PDU-Types
    • DL-UNITDATA, UL-UNITDATA, RA-CAPABILITY, PTM-UNITDATA, PAGING-PS, PAGING-CS, RA-CAPABILITY-UPDATE, RA-CAPABILITY-UPDATE-ACK, RADIO-STATUS, SUSPEND, SUSPEND-ACK, SUSPEND-NACK, RESUME, RESUME-ACK, RESUME-NACK, BVC-BLOCK, BVC-BLOCK-ACK, BVC-RESET, BVC-RESET-ACK, BVC-UNBLOCK, BVC-UNBLOCK-ACK, FLOW-CONTROL-BVC, FLOW-CONTROL-BVC-ACK, FLOW-CONTROL-MS, FLOW-CONTROL-MS-ACK, FLUSH-LL, FLUSH-LL-ACK, LLC-DISCARDED, SGSN-INVOKE-TRACE, STATUS, DOWNLOAD-BSS-PFC, CREATE-BSS-PFC, CREATE-BSS-PFC-ACK, CREATE-BSS-PFC-NACK, MODIFY-BSS-PFC, MODIFY-BSS-PFC-ACK, DELETE-BSS-PFC, DELETE-BSS-PFC-ACK, PERFORM-LOCATION-REQUEST, PERFORM-LOCATION-RESPONSE, PERFORM-LOCATION-ABORT, POSITION-COMMAND, POSITION-RESPONSE, RAN-INFORMATION, RAN-INFORMATION_REQUEST, RAN-INFORMATION-ACK, RAN-INFORMATION-ERROR, RAN-INFORMATION-APPLICATION-ERROR

backtotop.gifLogical Link Control Protocol (LLC)

  • Introduction
  • Functions of LLC
    • Introduction to Asynchronous Disconnected Mode (ADM)
    • Introduction to Asynchronous Balanced Mode (ABM)
    • Ciphering in GPRS
      Operation of GEA/X, Provision of the Input Offset Variables (IOV), Example for the Provision of IOV-UI, Calculation of the Input Variable, Example for the Calculation of INPUT
  • The LLC-Frame Format
    • The Address Field
      The Protocol Discriminator Bit (PD-Bit), The Command / Response Bit (C/R-Bit), The Service Access Point Identifier (SAPI)
    • The Information + Supervisory Frame (I+S-Frame)
      Introduction, Piggybacked Supervisory Frame, Length of the Information Field (N201), The Acknowledgement Request Bit (A-Bit)
    • The Receive Ready Frame (RR-Frame)
    • The Receive Not Ready Frame (RNR-Frame)
    • The Acknowledgement Frame (ACK-Frame)
    • The Selective Acknowledgement Frame (SACK-Frame)
    • The Unconfirmed Information Frame (UI-Frame)
      Meaning of the E-Bit (Encryption Mode), Meaning of the PM-Bit (Protection Mode), The UI-Dummy Frame
    • Details of ABM-Operation
    • The Disconnected Mode Frame (DM-Frame)
    • The Frame Reject Frame (FRMR-Frame)
    • The Exchange Identification Frame (XID-Frame)
      XID-Frame Parameters, Example of a XID-Frame

backtotop.gifSubnetwork Dependent Convergence Protocol (SNDCP)

  • SNDCP in the GPRS Protocol Stack
  • Functions of SNDCP
    • Compression in SNDCP
      RFC 1144 and RFC 2507, V.42bis, V.44
  • The SN-PDU Format
    • Segmentation of SN-DATA PDU’s
    • Segmentation of SN-UNITDATA PDU’s
  • The Network Service Access Point Identifier (NSAPI)
    • Meaning of the NSAPI
    • NSAPI <-> SAPI Mapping
  • Handling of SN-DATA PDU’s and SN-UNITDATA PDU’s
    • SN-UNITDATA PDU’s (LLC unacknowledged operation mode)
    • SN-DATA PDU’s (LLC acknowledged operation mode)

v5.1

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