University:
American Baptist College
Course:
CSCI 3621 | Networking
Academic year:

2022
Views:

119

Pages:

1
Author:

Alexa Livingston

LESSON 1 PUBLIC LAND MOBILE NETWORK (PLMN) • • • MS (Mobile Station) SIM (Subscriber Identity Module) BTS (Base Transceiver Station) - Star Cell Configuration - Umbrella Cell Configuration - Sectorized Cell Configuration • BSC (Base Station Controller) - Terminal Module & Controller - Switch Matrix - Operation and Maintenance • MSC (Mobile Switching Center) - Channel Assignment - Inter-MSC handover - Gateways to other networks • TRAU (Trans-coding Rate and Adaptation Unit) - Compress/Decompress Speech - Regular Pulse Excitation - Not used for connecting signal • HLR (Home Location Register) - Authentication and Security - Fixed Reference Point of the current mobile user location • VLR (Visitor Location Register) - Dynamic user info. & parameters • EIR (Equipment Identity Register) - White, black, gray lists *IMEI: International Mobile Equipment ID • • GMSC (Gateway Mobile Switching Center) OSS (Operation Subsystem; Maintenance GLOBAL SYSTEM FOR MOBILE COMMUNICATION (GSM) CALL SCENARIOS HANDOFFS • Mobile Controlled Handoff - Ms monitors signals around BS and issue a handoff • Network Controlled Handoff - BSs measure the MS signal and issue a handoff request • Mobile Assisted Handoff - Network ask MS to measure the BS signal • Inter-Base Station Handoff - MS will issue request by using free channel • Inter-System Handoff - BS are connected to 2 diff. MSCs - Verify RF line GSM NETWORK ARCHITECTURE THE MOBILE STATION 1. Mobile Equipment - It has an International Mobile Equipment Identity (IMEI) (15 Digit Number) 2. Subscriber Identity Module - Microchip for sharing info 5 TYPES OF IDENTITY NUMBERS ➢ Mobile Station ISDN (MSISDN) ➢ International Mobile Subscriber Identity (IMSI) ➢ International Mobile Station Equipment Identity (IMEI) ➢ Mobile Station Roaming Number (MSRN) ➢ Temporary Mobile Subscriber Identity Number (TMSI) 1. BASE STATION SUBSYSTEM ➢ Base Transceiver Station (BTS) - Performs channel, coding, ciphering and modulation - It has an International Cell Global Identity (CGI) and Base Station Identity Code (BSIC) Different Elements of RBS or BTS ➢ DXU – Distribution Switch Unit ➢ TRU – Transceiver Unit ➢ CDU – Combining and Distribution Unit ➢ ECU – Energy Control Unit o PSU: Power Supply Unit o BFU: Battery Fuse Unit Link Configuration – Cascade, Loop and Star 2. BASE STATION CONTROLLER ➢ Paging, Channel Allocation, Dynamic Power Control, Handover & Frequency Hoping