Wireless Networks

Wireless Networks PowerPoint PPT Presentation


  • 113 Views
  • Uploaded on
  • Presentation posted in: General

What is GPRS?. Bearer service for GSMPacket-switchedCan inter-operate with other packet-switched networks (e.g. IP, X.25)Higher data-rates and lower connection times than conventional GSM. GPRS Integration (1). Addition of GPRS Support Nodes (GSN)All GSNs connected by IP-based GPRS backbone netw

Download Presentation

Wireless Networks

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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


1. Wireless Networks Chris Lord (cil103) An Overview of General Packet Radio Service (GPRS) Theme created by Sakari Koivunen and Henrik Omma Released under the LGPL license.Theme created by Sakari Koivunen and Henrik Omma Released under the LGPL license.

2. What is GPRS? Bearer service for GSM Packet-switched Can inter-operate with other packet-switched networks (e.g. IP, X.25) Higher data-rates and lower connection times than conventional GSM

3. GPRS Integration (1) Addition of GPRS Support Nodes (GSN) All GSNs connected by IP-based GPRS backbone network Intra-PLMN (Public Land Mobile Network) – Connect GSNs on same network, private IP-based networks of the provider Inter-PLMN – Connect GSNs on different PLMNs; requires a roaming agreement to be installed

4. GPRS Integration (2) Serving GSN: Authentication/charging Visited Location Registry (VLR) User profiles Gateway GSN Packet delivery between mobile stations and external packet data networks (PDN), e.g. IP, X.25 Authentication/charging

5. GSM Network Interfaces (1) Gb interface: Connects the BSC with the SGSN Gn/Gp interfaces: Transmits user data and signalling data between GSNs Gn for transmissions on same PLMN Gp for transmissions on external PLMNs Gf interface: IMEI queries Gi interface: Connect to external PDNs

6. GSM Network Interfaces (2) Gr interface: Exchange of user information between HLR and SGSN Gc interface: Exchange of location information between GGSN and HLR Gs interface: Connects databases of SGSN and MSC/VLR to coordinate between GPRS and conventional GSM networks Gd interface: Connects SGSN with SMS Gateway MSC (SMS-GMSC)

7. GSM System Architecture

8. GPRS System Architecture

9. Services Bearer services for GPRS offer end-to-end packet-switched data transfer. Two types: Point-to-point (PTP) Internet access SMS messages Point-to-multipoint (PTM) Unidirectional distribution of information (e.g. weather, news) Conferencing services between multiple users

10. Quality of Service (1) QoS profiles can be defined using parameters derived from service precedence, reliability, delay and throughput. QoS profiles can be negotiated between the mobile user and the network, per session, depending on current resources, and can affect billing

11. Quality of Service (2) Three priorities: High, Medium, Low Three reliability classes that guarantee maximum values of loss, duplication, mis-sequencing and corruption of packets Delay defines maximum mean delay and 95-percentile delay Throughput specifies peak and mean bit-rate

12. GPRS and Conventional GSM GSM/GPRS services can be used in parallel. Three classes of mobile station: Class A – Simultaneous use of GSM and GPRS Class B – Can register for both GSM and GPRS, but only use one at a time Class C – Can attach for only either GSM or GPRS (with the exception of SMS messages)

13. Fin

  • Login