gsm call flow
DESCRIPTION
gsm call flowTRANSCRIPT
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GSM,GPRS,UMTS,HSDPA and HSUPA Protocols and Call flow
By
Kiran Koona
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Overview
1. GSM Protocols and Call flow 2. GPRS Protocols and Call flow 3. UMTS Protocols and Call flow 4. HSDPA and HSUPA Protocols.
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GSM
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GSM Architecture-Interfaces
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Layer 1 Protocol TDMA – Time Division Multiple Access G.703 – ITU PCM frame structure MTP – Message Transfer Part
Layer 2 Protocols LAPDm Link Access Protocol D-channel-mobile LAPD Link Access Protocol D-Channel
Layer 3 Protocols RR – Radio Resource Management MM – Mobility Management CM – Connection management BTSM – Base Transceiver Station Management SCCP – Signalling Connection Control Part BSSMAP – Base Station Subsystem MAP-Mobile Application Part DTAP – Direct Transfer Application Part
3-Layer Model
TUP , ISUP
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Physical Layer
1. Txn of bits 2. Error detection and Correction 3. Interleaving 4. Burst Formating 5. Measurements 6. Power Control 7. Modulation and Demodulation BTS-BSC: 64Kbps BSC-MSC:2Mbps (32*64Kbps)
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Physical Layer
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Interfaces with Physical Layer
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Layer-2: LAPDm and LAPD
1. Flow control 2. Sequence Numbering 3. Duplicate detection 4. Frame formatting
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Layer-3: RRM Protocols: RR, RSM, BSSAP. 1. Cell selection and Reselection Control
2. Handover procedure 3. Establishing , maintaining, monitoring and releasing the channels 4. Monitoring and forwarding of radio connections 5. Introduction of encryption 6. Change in transmission mode ,Channel coding depending on
channel conditions Advise L1 and L2 7. MS level measurement commands control 8. Frequency redefinition Downlink Freq hopping 9. Broadcasting System Information Downlink 10. Paging
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RRM Messages
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Layer-3:MM
Protocols : DTAP,MAP. 1. Authentication request/response 2. Ciphering Information/Commands from MSC 3. Abort from MSC Auth Failure 4. Normal location Updating request/response 5. Periodic location update 6. TMSI Reallocation Procedure 7. IMSI attach/detach 8. IMEI request/response
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MM Messages
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Layer-3:CM 1. Call control (CC) - manages call connections, 2. Supplementary service support (SS) - handles special services 3. Short message service support (SMS) - transfers brief texts. CC: Mobile-originating call establishment Setup message Mobile-terminating call establishment Paging Call clearing initiated by the network Call clearing initiated by the Mobile DTMF SS: Call Forwarding Call waiting ,Call Hold and Conference Multi Call CLIP,CLIR ,COLP and COLR SMS:
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CM Messages
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SS 7 To provide General purpose Signaling system to be used globally.
CCS , Out of Band
ITU-T Q.700 series.
Elements: SSP,STP and SCP.
Access Links: A to F
Analogy: MTP3 IP and SCCPTCP
SCCP: GTT, Ext MTP (Supports CL or CO)
Message Discrimination & distribution
TCAP: Query and Response (CL or CO )
MTP 3: Routing within SPC
MTP2: Node to node delivery
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SS 7 Architecture
SSP, STP and SCP
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SS 7 Logical Network
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MAP
MAP messages are carried by TCAP when dealing with Database centre.
MAP Sessions: Open, Close. Message Types: Request, Response, Notification and
Confirmation.
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GTT
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GSM Call flow
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GSM Logical Channels
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IMSI Attach
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Location Update
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Authentication and Ciphering
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Identity (IMSI) checking
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Call Origination
2929
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Call Clearing
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IMSI Detach
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MSRN Usage
Our HLR Knows where our Customer is,
Only our GMSC can inquire our HLR
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GPRS
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GPRS Architecture-Interfaces
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GPRS Protocol Stack
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Packet Fragmentation
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MAC
1. MAC arbitrates access to the shared medium between
multiple MSs and GPRS network. 2. Uplink: Managing limited resourcesSlotted Aloha 3. Downlink: Queuing and Scheduling of access attempts. 4. Priority handling between data flows of one UE 5. Priority handling between UEs by means of dynamic
scheduling—Downlink 6. Channel mapping 7. Traffic Volume monitoring
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RLC
1. SAR 2. Concatenation 3. Padding 4. Error Correction---CRC, ARQ (For AM) 5. In-Sequence delivery of SDUs 6. Duplicate detection 7. Flow control 8. Sequence number check---UM 9. Suspend/resume functionality 10. SDU discard
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LLC Provide a reliable logical link between MS and SGSN.
LLC messages are transparent to RAN.
Transmission in Asynchronous Disconnected Mode and
Asynchronous Balanced Mode
Ciphering.
Transfer of PDUs of Higher Layers
C-Plane: attach, authentication and PDP activation
U-Plane: carry actual data.
Can be AM or UM
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SNDCP • Transparent over BSS. Used only in U-Plane • multiplexing of PDPs. Can be AM or UM
• compression of user data (including IP header compression) RFC 1154 & 2507
• segmentation of data packets to be passed to the LLC layer.
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Frame Relay
Meshed N/W Frame Relay
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Frame Relay
Speed up to 2 Mbps.
Simple.
Superseded by ATM
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BSSGP
Transport both control and User data.
Provide the required QoS.
One-to-one mapping of BSSGP between SGSN and BSS.
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BSSGP Data Frames
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GTP 1. GTP-U and GTP-C. 2. Uses TCP for Reliable link 3. Uses UDP for non-Reliable link
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IP, TCP and UDP
IP: IPv4 or IPv6. Datagram Service. Class full or Class less Addressing.
TCP: Connection Oriented.
Ack ARQ. Sequence Number Checking.
Three-way handshake. Point-to-Point Add
Flow Control and Congestion Control.
UDP: Connection less.
Used for Delay Sensitive applications.
Supports Multicast Addressing.
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GPRS Callflow
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GPRS Logical Channels
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GPRS Attach
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PDP Context Activation
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PDP
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Data Transfer from MS
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Data Transfer to MS
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Web Access in GPRS
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PDP Context Deactivation
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Security
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GPRS Detach
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UMTS
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Architecture-Interfaces
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R99 Protocol Stack
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Access Stratum
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MAC Logical to Transport Conversion
Mac-b located at Node-B
Mac-c/sh and Mac-d are at SRNC.
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MAC functionalities
1. Mapping between logical channels and transport channels 2. Selection of appropriate TF (from the TFCS) for each Transport
Channel, depending on the instantaneous source rate 3. Priority handling between data flows of one UE 4. Priority handling between UEs by means of dynamic scheduling—
Downlink 5. Identification of UEs on common transport channels 6. Multiplexing/demultiplexing of higher layer protocol data units
(PDUs) 7. Traffic volume monitoring—Down link 8. Dynamic Transport Channel type switching 9. Ciphering—RLC (TM) 10. Access Service Class (ASC) selection for RACH transmission
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RLC
1. Transparent mode (Tr) , Unacknowledged Mode (UM) or
Acknowledged Mode (AM) 2. Tr and UM RLC entities are defined to be unidirectional, whereas the
AM-mode entities are described as bidirectional 3. Tr—Voice Call Video Call, UM—VOIP, Streaming
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RLC functionalities
1. Segmentation and reassembly 2. Concatenation 3. Padding 4. Transfer of user data 5. Error correction----ARQ 6. In-sequence delivery of higher layer PDUs 7. Duplicate detection 8. Flow control 9. SN check (unacknowledged data transfer mode). 10. Ciphering is performed in the RLC layer for acknowledged and
unacknowledged modes. 11. Suspend/resume function for data transfer
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RLC Dataflow
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RRC
1. Broadcast of system information 2. Paging and notification 3. Initial cell selection and reselection 4. Establishment, maintenance and release of an RRC
connection 5. Establishment and release of Radio bearers 6. Control of ciphering 7. Integrity protection of signalling messages 8. UE measurement reporting and control of the reporting 9. RRC connection mobility functions 10. Support of SRNS relocation 11. Support for downlink outer loop power control in the UE 12. Open-loop power control 13. CBS-related functions (BMC) 14. Handovers---preparation and execution 15. Control of requested QoS 16. Routing of Higher layer PDUs (Direct transfer) 17. MBMS control
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RRC States
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BMC
BMC: Broadcast/Multicast Control Protocol
SMS-CB service
1. Storage of CB 2. Traffic volume monitoring and radio resource request for
CBS 3. Scheduling of BMC messages 4. Transmission of BMC messages to UE
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PDCP
PDCP: Packet Data Convergence Protocol
1. PS Domain 2. PDCP contains compression methods, which are needed to get
better spectral efficiency over radio interface. 3. IP Packet header compression. Eg: 40 bytes for IPv4 and at least
60 bytes for IPv6. (RFC 2507) 4. Transfer of user data
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Non Access Stratum
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Protocol Interworking architecture
Transport : Carry Signaling and User data.
Radio N/W : Establish, maintain and Release RB.
System: Create Communication with Core network.
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Transport Network protocols
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Radio network protocols
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System network protocols
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UMTS Call flow
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R99 Channels
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Basic Model of Network transactions
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RRC Connection Setup
RRC Connection CCCH (By passing Node-B)
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Paging Paging Type 1 through PCCH
Paging Type-2 through DCCH
RRC Connection CCCH
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Authentication and Security Control
DCCH Channel and MM messages
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Transaction setup and RAB allocation (CS)
Setup : DCCH Call Proceeding: DTCH
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Transaction setup and RAB allocation (PS)
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Transaction Clearing with RAB release
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RRC Connection release
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LU in CS domain
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RU in PS domain
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HSDPA and HSUPA
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R99 RRM Architecture
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HSDPA and HSUPA RRM Architecture
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New Functionalities
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HSDPA and HSUPA Channels
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R99 Protocol Stack
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HSPA Protocol stack
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HSDPA Protocol Stack
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HSDPA user plane Protocol Architecture
Fast Node-B Scheduling
H-ARQ ,Incremental Redundancy
Soft Buffer at Node-B and UE
Retransmission at N/W borders No Soft Handover
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HSUPA Protocol Stack
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HSUPA user plane protocol Architecture
Mac-es/e : Uplink Scheduling
Mac-e: Hybrid ARQ , Buffer
Mac-es : In-sequence delivery (Soft Handover)
RLC re transmissions may take place if Physical layer re transmissions is exceeded initiated by RNC.
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References
1. 3G TS 25.321, MAC Protocol Specification. 2. 3G TS 25.322, RLC Protocol Specification. 3. 3G TS 25.323, PDCP Protocol Specification 4. 3G TS 25.331, RRC Protocol Specification 5. 3G TS 25.324, Broadcast/Multicast Control Protocol (BMC)
Specification 6. 3G TS 25.302, Services Provided by the Physical Layer 7. 3GPP TS 25.331 RRC specification 8. 3GPP TS 25.413 RANAP 9. 3GPP TS 25.423 RANSAP 10. 3GPP TS 25.433 NBAP 11. GSM.System.Engineering.-.Artech BOOK, by Asha Mehrotra. 12. GPRS BOOK-MC-HIL by R.J. Bates. 13. WCDM for UMTS-Wiley –H.Holma and A.Toskala 14. SS7 –MC-HILL by Travel Russel
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Datagram
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Virtual Circuit