Intro to gsm
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This document provides a summary of the history and architecture of GSM cellular networks. It discusses the evolution from early analog cellular networks to digital GSM networks. Key aspects of GSM include: - GSM uses TDMA and FDMA to allow multiple users to share frequencies and increase network capacity. - The core network components are BTS, BSC, MSC, HLR, VLR, and AuC which work together to handle calls, authentication, mobility, and roaming. - GSM operates in different frequency bands including 900MHz, 1800MHz, and 1900MHz and uses coding to digitize voice into 13kbps streams sent over traffic channels.
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Mobile networks have evolved through generations from 0G to 4G. 2G networks like GSM used frequency division multiple access and provided basic voice and SMS services. 3G networks such as UMTS enabled higher speed digital services using WCDMA technology. Between 2G and 3G, networks added technologies like GPRS, EDGE, and HSDPA (3.5G) to improve speeds. 4G networks like LTE provide broadband access using OFDM and MIMO with speeds over 100 Mbps for voice, data and multimedia services on all-IP networks.
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The document provides an overview of the Global System for Mobile Communication (GSM) standard. It describes GSM as an integrated European mobile system that enables international roaming. The key objectives of GSM are outlined as well as the basic system elements, including mobile stations, base station systems, and mobile switching centers. The document also discusses concepts such as frequency reuse, cellular networks, handover, and multiple access methods used in GSM like TDMA.
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The document discusses the evolution of mobile communication technologies from 1G to 5G. It provides details on the key aspects of each generation including:
- 1G introduced in 1982 used analog signals for voice calls. 2G launched in late 1980s used digital signals for voice and low-speed data.
- 3G launched in 2000 aimed to offer higher data speeds up to 14 Mbps using packet switching. 4G offers speeds up to 100 Mbps for high-speed internet.
- 5G is still under development to support applications requiring high data rates like wireless broadband, multimedia messaging, mobile TV, and digital video broadcasting.
- Mobile technologies have progressed from simplex to full duplex transmission and 2
Wireless mobile communication
Wireless communications is a type of data communication that is performed and delivered wirelessly. This is a broad term that incorporates all procedures and forms of connecting and communicating between two or more devices using a wireless signal through wireless communication technologies and devices.
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Introduction to gsm
The document provides an overview of the history and architecture of GSM cellular networks. It discusses the evolution from analog 1G networks to digital 2G and 2.5G networks. The key components of GSM architecture include the BTS, BSC, MSC, HLR, VLR, and AuC. GSM uses TDMA and FDMA to allow multiple users to share the frequency spectrum. It also relies on the SS7 protocol for signaling communication between network components to enable features like roaming.
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Intro to gsm
- 1. GSM Security Overview (Part 1) Wireless telephone history
- 4. But what’s cellular? HLR, VLR, AC, EIR MSC PSTN BS
- 13. GSM Overview