Presentation on theme: "GPRS/EDGE OVERVIEW. Course contents GPRS Background and Evolution GSM/GPRS network GPRS Architecture IP Addressing in GPRS GPRS Air Interfaces MS types."— Presentation transcript:
Course contents GPRS Background and Evolution GSM/GPRS network GPRS Architecture IP Addressing in GPRS GPRS Air Interfaces MS types and Coding Schemes Mobility Management PDP Context Activation Sequence GPRS Roaming GPRS Charging Practical Demonstration of GPRS
GPRS BACKGROUND AND EVOLUTION
GPRS BACK GROUND With Mobile penetration reaching its full potential, GPRS gives Mobile operators competitive edge and optimum use of the infrastructure. SMS is a good example of just how hungry users are for data services. The main Objective of GPRS is to offer the access to standard data networks, using protocols e.g. TCP/IP and X.25 Transactions such as Credit Card checks and a variety of telemetric applications benefit from the fast session set-ups. GPRS enables efficient use of radio resources by allowing many data users to share the same interface on a statistical basis. The main benefits of GPRS are that it reserves radio resources only when there is data to be sent Mobile users doesn’t have to connect to the network each time he wants to transfer the data, he can stay connected all day.
Evolution from GSM to 3G The GSM Growth Phases GSM 2G HSCSD GPRS 2.5G EDGE 3G
GSM Evolution GPRS 200 KHz carrier 115 Kbps peak data rates EDGE 200 KHz carrier Data rates up to 384 Kbps 8-PSK modulation Higher symbol rate UMTS 5 MHz carrier 2 Mbps peak data rates New IMT GHz spectrum GSM 200 KHz carrier 8 full-rate time slots 16 half-rate time slots GSMGPRS EDGE UMTS 3G 2.5G 2G HSCSD Circuit-switched data 64 Kbps peak data rates
MAIN ADVANTAGES FOR OPERATORS More Revenue : By providing more than a mobile connection. Also operator can charge on the basis of type and amount of content accessed. Huge Potential Market for Data Sevices : Mobile Phone and Internet, both are fastest growing technologies and GPRS is the merger of two. Fast Roll-out and Continuous Network Expansion : GPRS is an integral part of GSM. GPRS uses excess voice capacity for data : GPRS Packets are transmitted in short, free periods between busy hour calls.
Free GSM Capacity
GPRS Vs GSM 1. SUPPORTS BOTH CKT.Only circuit switched. SWITCHED as well as packet switched service. 2. MS Utilizes AutomaticNo re-transmission is retransmission (ARQ) at provided. data link layer to re-transmit error frames. 3. Multiple time slots can be Single time slot per user. allotted to a single user 4. One time slot can be allottedSingle time slot per user. to several users. 5. Charging/ billing more complexSimple time-based billing. (Volume based, Q.O.S. based) GPRS Vs GSM
* Communications- , fax, intranet/ internet access. * Value added services - Information services, games, e-commerce. * Location-based applications - Navigation, traffic conditions, airline/rail schedule, location finder. * Vertical applications - Freight delivery, fleet management, sales-force automation * Location sensitive A user nearing a cinema hall or Advertising - a restaurant receives flashes of advertisement TYPICAL GPRS SERVICES
GPRS NETWORK ELEMENTS
GSM NETWORK ELEMENTS The Main elements of GSM are: NSS : MSC VLR HLR (Includes Authentication Center and Equipment Identity Register) BSS : BSC BTS Transcoder NMS Fault Management Configuration Management Performance Management
Network ElementSoftwareHardware SGSN SG1DX Platform GGSN G1IP650 Firewall CheckpointIP650 Ethernet Switch N/A Cisco Catalyst DNS HP-UX 11.00HP 9000 A class CG HP-UX 10.20HP K class Border Gateway BGP4 IP650 DHCP HP-UX HP 9000 A class GPRS Network Elements
Authentication, Authorization GTP tunneling to GGSN Ciphering & compression Mobility Management Session Management Interaction with HLR, MSC/VLR Charging & statistics NMS interfaces SGSN Role
GGSN Role Interface to external data networks Encapsulate in GTP and forwards end user data to right SGSN Routes mobile originated packets to right destination Filters end user traffic Collects charging and statistic information for data network usage
MS Class CLASS A: Supports simultaneous attach, simultaneous activation, simultaneous monitor, simultaneous invocation, and simultaneous traffic. CLASS B: Simultaneous traffic shall is not supported. The mobile user can make and/or receive calls on either of the two services sequentially but not simultaneously. The selection of the appropriate service is performed automatically CLASS C: Supports only non-simultaneous attach. Alternate use only. The status of the service which has not been selected is detached, that is, not reachable.
GPRS Channel Coding Schemes
GPRS MOBILITY MANAGEMENT
Mobility Management State Idle Standby Ready Packet TX/RX STANDBY Timer Expiry GPRS Attach / Detach READY Timer Expiry MS location known to SGSN level. MS is capable of receiving Point-to-Multipoint data and being paged for Point-to-Point data MS location not known. Subscriber is not reachable by the GPRS NW. MS location known to cell level. MS is transmitting or has just been transmitting. MS is capable of receiving Point-to-Point data and Point-to-Multipoint data.
Routing Area RAI = MCC+MNC+LAC+RAC
GPRS Mobility Management Routing Area : The RA is a new concept for tracing the MS location. Cell =< RA =< LA served by one SGSN RAI = MCC + MNC + LAC + RAC Every time the MS sees the new RAI is has to initiate the RA update procedure.
Mobility Management States : The IDLE State is when the MS is not connected. The Standby State is when the MS is connected to the GPRS Network The Ready State is when the MS is ready to connect to the external IP Network. Changing between states can be initiated from the MS, from the network and from the timers set. GPRS Mobility Management
PDP CONTEXT ACTIVATION
BTS BSC SGSN GGSN Intranet GPRS Backbone IP Network SS7 HLR DNS (1) MS sends "Activate PDP Context Request" to SGSN Access Point Name PDP Type (IP) PDP Address (empty == dynamic) Access Point Name = Reference to an external packet data network the user wants to connect to Internet APN= "Intranet.Ltd.com" Access Point (2) SGSN checks against HLR Access Point Name Dynamic / static IP address PDP Context Activation Accessing the HLR
SECURITY IN GPRS Authentication of the subscriber IMEI Checking User Identity Confidentiality (TMSI in GSM, P-TMSI in GPRS) Ciphering of the data traffic between MS and SGSN Private IP Addressing in the GPRS backbone. Ciphered links and authentication between nodes in the GPRS Backbone. Screening of packets coming from the external networks (Firewall). (P-TMSI is used to derive the Temp Logical Link Identity (TLLI)) GPRS SYSTEM HAS INHERITED THE GSM PH-2 SECURITY FUNCTIONS ADDITIONAL GPRS SECURITY FEATURES ARE
The Abbreviation GPRS = General Packet Radio System EGPRS = GPRS + EDGE modulation
EDGE – Provide 3G services today Provide 3G services with existing licenses New modulation optimized for wireless data services Link adaptation: Take highest possible rate Covered by existing GSM licenses Same channel structure, network infrastructure, frequency planning and protocol as today’s GSM
MSMS BTS PUCPUC BSCMSC/VLR HLR SGSNGGSN Backbone Network ISP Network Corporate Network AUC SMS G/IW MSC Gb Gd Gs Gn Gr Gn Gi EDGE TRU MSMS Evolution to EDGE
voice Free TS Data Free TS Standard GSM Transceiver EDGE Transceiver EDGE increases capacity
System upgrade for EDGE BSCBSC BSC Software Upgrade RBSRBS EDGE TRU EDGE enabled RBS
What EDGE would mean to subscribers Streaming Applications Very high speed downloads Corporate Intranet connections Quicker MMS Video Phone Vertical corporate applications – Video Conference, Remote presentations