1 / 44

OMQ000001 GPRS Principle

OMQ000001 GPRS Principle. ISSUE 2.0. 3G. 2.5G. 2. Mbps. IMT-2000. 384. kbps. EDGE. 2G. 115. kbps. GPRS. 57.6. kbps. HSCSD. 9.6. kbps. GSM. GSM Development Evolution. General Packet Radio Service (GPRS) is a packet oriented Mobile Data Service available to users of

freira
Download Presentation

OMQ000001 GPRS Principle

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. OMQ000001 GPRS Principle ISSUE 2.0

  2. 3G 2.5G 2 Mbps IMT-2000 384 kbps EDGE 2G 115 kbps GPRS 57.6 kbps HSCSD 9.6 kbps GSM GSM Development Evolution

  3. General Packet Radio Service (GPRS) is a packet orientedMobile Data Service available to users of Global System for Mobile Communications (GSM) and IS-136mobile phones. It provides data rates from 56 up to 114 k.bit /s. GPRS is a technology which is changing the present shape of mobile communication. 2G cellular systems combined with GPRS are often described as "2.5G", that is, a technology between the second (2G) and third (3G) generations of mobile telephony

  4. Technology of GPRS • Splits data into Internet Protocol (IP) packets • Transmitted in packet switching connection • Objectives: • give support for bursty traffic • use efficiently network and radio resources • provide flexible services at relatively low costs • possibility for connectivity to the Internet • provide fast access time • to have and support flexible co-existence with GSM voice 

  5. Bandwidth share the same bandwidth be served from a single cell LIMITED IN REALITY Speed Theoretically, maximum speed ~ 144 kbps Using all eight timeslots at the same time SPEEDS MUCH LOWER IN REALITY What is GPRS?

  6. Key user features of GPRS IMMEDIACY NEW APPLICATIONS, BETTER APPLICATIONS SERVICE ACCESS Keynetwork features of GPRS PACKET SWITCHING SPECTRUM EFFICIENCY Features of GPRS

  7. How is GPRS? • Technology used by GPRS • Packet-mode technique over GSM radio networks • Optimizes the use of radio and network resources

  8. When is GPRS? Figure: GSM migration paths

  9. Opportunities • Bridge of the gap for 3G • Sensible steeping-stone adoption • Test of higher bandwidth services to come in 3G • First time non-voice services to mass market

  10. Which is GPRS? Application • VOICE MAIL SERVICES • CHAT • TEXTUAL AND VISUAL INFORMATION • IMAGES • WEB BROWSING • DOCUMENT SHARING/ COLLABORATIVE WORKING

  11. Which is GPRS? • Applications • AUDIO • CORPORATE EMAIL • INTERNET EMAIL • VEHICLE POSITIONING • REMOTE LAN ACCESS • FILE TRANSFER • HOME AUTOMATION

  12. Applications • Personal Digital Assistant (PDA)

  13. Advanced Consumer Applications • information on demand regarding weather, traffic, entertainment, stock exchange, flight schedule etc. • bank transactions • fast communication with the service provider to receive administrative information such as statements, bill reminders, or new services

  14. Advanced Business Applications • tracking of taxis and credit card validation for customer payment • control over the position of trucks for transportation companies • localization of stolen cars • support of security and monitoring systems • distribution of specific short messages to selected groups of users in large corporations

  15. GSM Architecture PSTN PDN ISDN GMSC BSC BTS MS MSC BTS BSC EIR MS AUC HLR BTS VLR MS

  16. GPRS Architecture Other GPRS PLMN GGSN Gp Gn SGSN Gb Gf BSC Gr Gs Gi BTS Gc GGSN PDN EIR D BTS HLR MS MSC/VLR

  17. GPRS backbone network SGSN Internet GGSN SGSN Gb Gc Gd Gr Gs Gi IP interface SS7 interface PDP network (IP/X.25) Network interface types Gn MT TE SMS- GMSC MSC A BSS Um HLR MS

  18. SGSN- Serving GPRS Support Node GGSN- Gateway GPRS support Node PCU Packet Control Unit ADDITIONAL ELEMENTS OF THE GPRS CG ( Charging Gateway) NMS ( Network Management Center) BG (Border Gateway) LIG (Legal Interception Gateway) DNS Key Elements Of GPRS Network

  19. BSS GPRS MODIFICATION • BTS Requires Software up gradation • Inclusion of CCU in the BTS • BSC requires software upgrade and addition of PCUSN • PCUSN can contain PCUs

  20. Packet Control Unit (PCU) Functions • Provides physical and logical data interface out of the BSS for packet data traffic • ARQ functions • Radio channel management • LLC layer PDU segmentation/reassembly • Packet data transfer scheduling

  21. CHANNEL CODING UNIT • Channel Coding functions • FEC • Interleaving • Radio channel functions

  22. Um GSN BSC BTS Gb CCU A PCU CCU Abis GSN BSC BTS CCU Gb B PCU CCU GSN BSC BTS CCU C PCU CCU Gb CCU=Channel Codec Unit PCU= Packet Control Unit Position of PCU

  23. Position of Huawei PCU CCU BSC BTS CCU SGSN PCU Gb CCU BSC BTS Pb CCU Abis Um

  24. GPRS(BSS side) upgrade to EDGE Upgrade BSC software Upgrade PCU software upgradeBTS software

  25. DATA BASES-VLR/HLR • GPRS shares GSM database resources • Databases software upgrades required to accommodate new GPRS functionality and parameters when interacting with GSM. • EIR/AuC will also require software upgrades for GPRS-specific authentication/authorization

  26. Serving GPRS Support Node SGSN • SGSN “ Packet Switching MSC – delivers packets to and received packets from MTs • SGSN sends queries to HLR to obtain profile data of GPRS subscribers. • An SGSN detects new GPRS in its service area, process registration and authentication and manages ciphering between MTs and SGSN. • It also performs Mobility Management Functions i.e. GPRS location Area (LA), attach and detach.

  27. Gate Way GPRS Support Node (GGSN) • Interface between GPRS back bone and external PDNs such as the IP-based internet and X.25 networks. • The GGSN also translate between data formats , signaling protocols and address information between the GPRS network and differing external networks. • Address Mapping by using DNS • Supports multiple SGSNs • GGSNs maintain routing information

  28. GPRS Coding Schemes • CS-1 • CS-2 • CS-3 • CS-4

  29. Real-time collection of GPRS bills Temporary storage and buffering of GPRS bills Pre-processing of GPRS bills Sending GPRS bills to the billing center Functions of CG

  30. BG enables the following protocols necessary for interworking between operators Security protocol: IPSec and firewall are recommended Routing protocol: BGP is recommended Billing protocol: determined by the operators with negotiation; BG might be needed in collecting billing information It is normally based on routers It can be configured in combination with GGSN Functions of BG

  31. Functions of MSC/VLR When Gs interface is installed, MSC/VLR can support • Establishment and maintenance of the association between SGSN and MSC/VLR. • GPRS combined mobility management procedure. • Combined IMSI/GPRS attachment/detachment. • Combined location area/routing area updating. • Circuit paging coordination function. The wireless resource usage can be greatly improved.

  32. Saving and updating GPRS subscriber subscription data User authentication Providing location/routing information and processing needed in mobility management and routing, for example: Saving and updating user service SGSN number and address GPRS user location deletion indication Whether MS is reachable. Subscriber tracing (optional) Functions of HLR/AUC

  33. Functions of SMS-GMSC/SMS-IWMSC • After Gd interface is installed, short messages can be sent via GPRS, which reduces the occupation on SDCCH and cuts down the influence on voice services by SMS services. • The operator can select to send SMS via MSC or SGSN.

  34. EDGE EDGE can also be known as extended version of GPRS therefore it is also called EGPRS. EDGE is standardized by 3GPP as part of the GSM family, and it is an upgrade that provides more than three-fold increase in both the capacity and performance of GSM/GPRS networks. introducing sophisticated methods of coding and transmitting data, delivering higher bit-rates per radio channel. EDGE can be used for any packet switched application, such as an Internet connection. EDGE-delivered data services create a broadband internet-like experience for the mobile phone user.

  35. High bandwidth data applications such as video services and other multimedia benefit from EGPRS' increased data capacity. EDGE was deployed on GSM networks beginning in 2003. EDGE/EGPRS is implemented as a bolt-on enhancement for 2G and 2.5GGSM and GPRS networks, making it easier for existing GSM carriers to upgrade to it

  36. EDGE: TRANSMISSION TECHNIQUE In addition to Gaussian minimum-shift keying (GMSK), EDGE uses higher-order PSK/8 phase shift keying (8PSK) for the upper five of its nine modulation and coding schemes. EDGE produces a 3-bit word for every change in carrier phase. This effectively triples the gross data rate offered by GSM. EDGE, like GPRS, uses a rate adaptation algorithm that adapts the modulation and coding scheme (MCS) according to the quality of the radio channel, and thus the bit rate and robustness of data transmission. This increases the probability of correct decoding. EDGE can carry a bandwidth up to 236.8 kbit/s (with end-to-end latency of less than 150 ms) for 4 timeslots (theoretical maximum is 473.6 kbit/s for 8 timeslots) in packet mode. This means it can handle four times as much traffic as standard GPRS.

  37. EDGE modulation and coding scheme (MCS) EDGE is four times as efficient as GPRS. GPRS uses four coding schemes (CS-1 to 4) while EDGE uses nine Modulation and Coding Schemes (MCS-1 to 9).

More Related