GSM

Duration: 23 min

This video lesson is available to enrolled students.

Return to /learn/MP-SET-COMPUTER-SCIENCE/unit-9-data-communication-and-computer-networks/mobile-computing/gsm/asset-gsm-24976 after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. Paper - 1 | Unit - 1 | Teaching Aptitude: Concept and Objectives of Teaching / शिक्षण की अवधारणा एवं उद्देश्य, Levels of Teaching / शिक्षण के स्तर, Learner's Characteristics / शिक्षार्थी की विशेषताएँ, Learning: Nature and Theories / अधिगम: प्रकृति एवं सिद्धांत, Cognition, Memory and Metacognition / संज्ञान, स्मृति एवं अधिसंज्ञान, Factors Affecting Teaching / शिक्षण को प्रभावित करने वाले कारक, Effective Teaching and the Teacher / प्रभावी शिक्षण एवं शिक्षक, Instructional Objectives and Lesson Planning / अनुदेशनात्मक उद्देश्य एवं पाठ नियोजन, Methods of Teaching / शिक्षण विधियाँ, Offline and Online Teaching Methods / ऑफ़लाइन एवं ऑनलाइन शिक्षण विधियाँ, Teaching Support System / शिक्षण सहायक प्रणाली, Evaluation Systems / मूल्यांकन प्रणाली, Biological Basis of Emotion / संवेग का जैविक आधार, Central and Peripheral Nervous Systems / केन्द्रीय और परिधीय तंत्रिका तंत्र
  2. Paper - 1 | Unit - 2 | Research Aptitude: Research: Meaning, Features and Scientific Method / अनुसंधान: अर्थ, लक्षण व वैज्ञानिक विधि, Research Paradigms and Approaches / अनुसंधान के प्रतिमान एवं उपागम, Types of Research / अनुसंधान के प्रकार, Variables and Measurement / चर एवं मापन, Methods of Research / अनुसंधान की विधियाँ, Steps of Research / अनुसंधान के चरण, Sampling / प्रतिचयन, Tools and Methods of Data Collection / आँकड़ा संग्रह के उपकरण एवं विधियाँ, Data Analysis and Statistics in Research / आँकड़ा विश्लेषण एवं शोध सांख्यिकी, Thesis and Article Writing / शोध-प्रबंध एवं लेख लेखन, Application of ICT in Research / अनुसंधान में ICT का अनुप्रयोग, Research Ethics / शोध नैतिकता
  3. Paper - 1 | Unit - 3 | Comprehension: Literal Comprehension, Vocabulary and Language in Context, Inferential Comprehension, Critical Comprehension, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions)
  4. Paper - 1 | Unit - 4 | Communication: Communication: Meaning, Nature and Process / संचार: अर्थ, प्रकृति एवं प्रक्रिया, Types and Levels of Communication / संचार के प्रकार एवं स्तर, Verbal and Non-verbal Communication / मौखिक एवं अमौखिक संचार, Semiotics and Meaning / संकेत विज्ञान एवं अर्थ, Models and Theories of Communication / संचार के मॉडल एवं सिद्धांत, Effective Communication / प्रभावी संचार, Barriers to Communication / संचार की बाधाएँ, Classroom Communication / कक्षा संचार, Mass Media: Types and Evolution / जनसंचार माध्यम: प्रकार एवं विकास, Mass Media and Society / जनसंचार एवं समाज, Digital and New Media / डिजिटल एवं नव माध्यम, General Awareness (Legacy Paper 1) / सामान्य जागरूकता (पुराना पेपर 1)
  5. Paper - 1 | Unit - 5 | Mathematical Reasoning and Aptitude: Number System and Simplification / संख्या पद्धति एवं सरलीकरण, Algebra and Ages / बीजगणित एवं आयु, Percentage / प्रतिशतता, Ratio, Proportion, Partnership and Mixtures / अनुपात, समानुपात, साझेदारी एवं मिश्रण, Averages / औसत, Profit, Loss and Discount / लाभ, हानि एवं बट्टा, Simple and Compound Interest / साधारण एवं चक्रवृद्धि ब्याज, Time and Work / समय एवं कार्य, Speed, Time and Distance / चाल, समय एवं दूरी, Mensuration and Geometry / क्षेत्रमिति एवं ज्यामिति, Series / श्रेणी, Coding-Decoding / कूटलेखन-कूटवाचन, Relationships, Directions and Ranking / संबंध, दिशा एवं क्रम, Arrangements, Puzzles, Clock and Calendar / व्यवस्था, पहेलियाँ, घड़ी एवं कैलेंडर, Mathematical Foundations, जीवनी, Philosophy of the Constitution / संविधान का दर्शन, Analysis, Indian Polity and Governance (Legacy Unit 10) / भारतीय राजव्यवस्था और शासन (पुराना यूनिट 10)
  6. Paper - 1 | Unit - 6 | Logical Reasoning: Structure of Arguments / युक्ति की संरचना, Terms, Definitions and Uses of Language / पद, परिभाषा एवं भाषा के उपयोग, Categorical Propositions / निरुपाधिक प्रतिज्ञप्तियाँ, Categorical Syllogism / निरुपाधिक न्यायवाक्य, Venn Diagrams / वेन आरेख, Deduction, Induction and Analogy / निगमन, आगमन एवं सादृश्यता, Fallacies / तर्कदोष, Indian Logic: Pramanas / भारतीय तर्कशास्त्र: प्रमाण, Anumana and Vyapti / अनुमान एवं व्याप्ति, Hetvabhasa / हेत्वाभास, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Aristotle / अरस्तू, Western Schools of Philosophy / पाश्चात्य दर्शन की विचारधाराएँ, Kant / कांट, Sadhana Paada, Vaiśeṣika / वैशेषिक
  7. Paper - 1 | Unit - 7 | Data Interpretation: Data and Graphical Representation / आँकड़े एवं आलेखीय निरूपण, Data Interpretation: Tables / आँकड़ा निर्वचन: तालिका
  8. Paper - 1 | Unit - 8 | Information and Communication Technology: Computer Fundamentals and Hardware, Memory, Storage and Data Representation, Computer Software, Office Applications, Multimedia and File Formats, Computer Networks, Internet and World Wide Web, Email and Online Communication, Cyber Security, Digital Ethics, IPR and Society, Cloud and Distributed Computing, Emerging Technologies, ICT in Education and Governance, Cyber Threats and Malware Attacks, Role of Internet and Web Services, Electronic Data Interchange and E-Commerce, Internet Fundamentals, Web Design & Development, Web Publishing & Hosting, Emerging Technologies, Terms & Abbreviations, Society, Law & Ethics, Keyboard Shortcuts, Website, Browser & Services, Protection of Geographical Indications / भौगोलिक संकेतों का संरक्षण
  9. Paper - 1 | Unit - 9 | People Development and Environment: Ecosystems and Biodiversity / पारितंत्र और जैव विविधता, Human and Environment Interaction / मानव और पर्यावरण की अंतःक्रिया, Development and Environment / विकास और पर्यावरण, Natural Resources – Forests, Water and Soil / प्राकृतिक संसाधन: वन, जल और मृदा, Energy Resources / ऊर्जा संसाधन, Air Pollution / वायु प्रदूषण, Water Pollution and Treatment / जल प्रदूषण और उपचार, Noise Pollution / ध्वनि प्रदूषण, Waste Management / अपशिष्ट प्रबंधन, Environmental Health and Toxicology / पर्यावरणीय स्वास्थ्य और विषविज्ञान, Climate Change and Global Environmental Issues / जलवायु परिवर्तन और वैश्विक पर्यावरणीय समस्याएँ, Natural Hazards and Disaster Management / प्राकृतिक प्रकोप और आपदा प्रबंधन, Indian Environmental Laws and Policies / भारतीय पर्यावरण कानून और नीतियाँ, International Environmental Agreements / अंतर्राष्ट्रीय पर्यावरण समझौते, Environment / पर्यावरण, Geography / भूगोल, Factory and Industry Systems / कारखाना और उद्योग व्यवस्थाएँ, Earth Materials, Surface Features and Processes, Communicable Diseases and Immunization / संक्रामक रोग और प्रतिरक्षण
  10. Paper - 1 | Unit - 10 | Higher Education System: Education in Ancient India / प्राचीन भारत में शिक्षा, Ancient Centres of Higher Learning / प्राचीन भारत के उच्च शिक्षा केंद्र, Colonial Education Policies and Commissions / औपनिवेशिक काल की शिक्षा नीतियाँ और आयोग, Colonial Colleges, Universities and Reformers / औपनिवेशिक कॉलेज, विश्वविद्यालय व सुधारक, Education Commissions and Policies after Independence / स्वतंत्र भारत में शिक्षा आयोग और नीतियाँ, National Education Policy 2020 / राष्ट्रीय शिक्षा नीति 2020, Types of Higher Education Institutions / उच्च शिक्षा संस्थानों के प्रकार, Learning Programmes and Academic Credits / अधिगम कार्यक्रम और अकादमिक क्रेडिट, Professional, Technical and Skill-Based Education / व्यावसायिक, तकनीकी और कौशल आधारित शिक्षा, Value Education and Environmental Education / मूल्य शिक्षा और पर्यावरण शिक्षा, Governance, Administration and Financing / शासन, प्रशासन और वित्तपोषण, Regulation, Accreditation and Ranking / उच्च शिक्षा का नियमन, प्रत्यायन और रैंकिंग
  11. Paper 2 | Unit 1 | Discrete Structures and Optimization: Propositional and Predicate Logic, Set Theory, Relations, Functions, Permutation, Combination and Probability / क्रमचय, संचय एवं प्रायिकता, Graph Theory, Group Theory, Digital Systems & Boolean Basics, Boolean Expression, Boolean Minimization, Optimization, Markov Chains
  12. Paper 2 | Unit 2 | Computer System Architecture: Logic Gates & Hardware, Combinational Circuit, Sequential Circuits, Number System, Number Representation, Floating Point Rep, Basics of COA, Register Transfer and Microoperations, Programming the Basic Computer, Instr Formats & Modes, Control Unit Design, Pipelining, Input Output Organisation, Cache Memory Organization, Multiprocessors
  13. Paper 2 | Unit 3 | Programming Languages and Computer Graphics: Language Design, C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling, HTML Basics, XML, JavaScript-Basics, Java, Basics of Computer Graphics, 2-D Geometrical Transforms and Viewing, 3-D Object Representation, Geometric Transformations and Viewing, OOPS with C++, Java Fundamentals, Array, String, IO & References, OOPS with Java
  14. Paper 2 | Unit 4 | Database Management Systems: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, ORDBMS, Database Security & Authorization, Query Processing & Optimization, Enhanced Data Models, Data Warehousing & Mining, Big Data Systems, NoSQL
  15. Paper 2 | Unit 5 | System Software and Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management, Windows OS, Linux OS, Security, Distributed Systems, Virtual Machines
  16. Paper 2 | Unit 6 | Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  17. Paper 2 | Unit 7 | Data Structures and Algorithms: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos, Advanced Algorithms
  18. Paper 2 | Unit 8 | Theory of Computation and Compilers: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Moore & Mealy Machines, Pushdown Automata & CFG, Turing Machines, Complexity Theory, Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization, Run Time Environment
  19. Paper 2 | Unit 9 | Data Communication and Computer Networks: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Security, Cloud Computing, Mobile Computing
  20. Paper 2 | Unit 10 | Artificial Intelligence: Approaches to AI, Search Algorithms, Game Playing, Knowledge Representation, Planning, Multi Agent Systems, Fuzzy Sets, Natural Language Processing, Artificial Neural Networks, Genetic Algorithms
  21. Full Notes: Paper 1 Full Notes
  22. Paper 1 | Full Mock Tests:
  23. Paper 2 | Full Mock Tests:
  24. Paper 1 | Previous Year Papers:
  25. Paper 2 | Previous Year Papers:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This lecture introduces GSM (Global System for Mobile Communications) as a digital cellular standard that replaced first-generation analog systems. The instructor defines GSM’s role in voice, SMS, and basic data services, then presents an architecture diagram showing a mobile user connected through a base station to network elements such as the HLR, VLR, and other networks. The lesson moves to seven key features: digital communication, SIM-based identification, voice and SMS, international roaming, multiple access using FDMA and TDMA, security through authentication and encryption, and cellular architecture. The instructor then explains the three major GSM subsystems: the Radio Subsystem (RSS), the Network and Switching Subsystem (NSS), and the Operation Support Subsystem (OSS). The RSS is broken down into the Mobile Station (MS), Base Transceiver Station (BTS), and Base Station Controller (BSC), with board annotations showing the flow mobile -> BTS -> BSC -> MSC and the relationship BSS = BTS + BSC. A component grid introduces MS, BTS, BSC, MSC, HLR, VLR, AuC, and EIR. The final section covers channel access, showing FDMA as separate frequency channels and TDMA as time slots, followed by a comparison of GSM advantages and limitations, including better voice quality than analog systems, authentication and encryption, international roaming, and low data speed compared with modern technologies.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The lecture opens with a slide titled “GSM (Global System for Mobile Communications)” and an Introduction section. The on-screen text states that GSM is a digital cellular communication standard used for mobile voice communication, SMS, and basic data services, and that it was introduced to replace first-generation analog mobile systems. A diagram shows a caller connected to a cell tower, with HLR and VLR boxes and “Other Networks” linked to Voice Call, SMS, and Data Services such as GPRS. The instructor points to the title and introductory text, establishing GSM as the central topic and linking the definition to the network diagram.

  2. 2:00 – 5:00 02:00-05:00

    The instructor continues with the introduction and then moves to a slide headed “Key Features of GSM.” The architecture diagram is annotated with blocks labeled BTS, BSC, MSC, HLR, VLR, EIR, and AuC, and the instructor circles the right side containing “Other Networks,” “Voice Call,” and “Text Message (SMS).” The key features slide lists numbered boxes 1–7, including Digital Communication, SIM-Based Identification, Voice and SMS, International Roaming, Multiple Access (FDMA & TDMA), Security, and Cellular Architecture. Box 1 shows “Voice (Analog)” being converted into a “Digital Signal,” while box 2 shows a SIM Card leading to Subscriber Identification.

  3. 5:00 – 10:00 05:00-10:00

    The “Key Features of GSM” slide remains on screen while the instructor explains the numbered feature boxes. Box 5 is labeled “Multiple Access (FDMA & TDMA),” box 6 Security lists “Authentication (to verify user)” and “Encryption (to protect data)” with lock icons, and box 7 Cellular Architecture shows hexagonal cells with towers. The instructor points to box 7 and uses a stylus to emphasize the cellular layout. This section reinforces that GSM combines digital signaling, subscriber identification via SIM, multiple access methods, security mechanisms, and a cell-based network structure.

  4. 10:00 – 15:00 10:00-15:00

    The lesson shifts to “GSM Architecture,” listing three major subsystems: 1. Radio Subsystem (RSS), 2. Network and Switching Subsystem (NSS), and 3. Operation Support Subsystem (OSS). The instructor draws and annotates the Radio Subsystem, showing the Mobile Station (MS), Base Transceiver Station (BTS), and Base Station Controller (BSC). On-screen text includes “BSS -> BTS + BSC,” and the instructor highlights the wireless link between MS and BTS as well as the many-to-one relationship between multiple BTS units and a BSC. This part breaks down the abstract architecture into concrete components and their hierarchical connections.

  5. 15:00 – 20:00 15:00-20:00

    The instructor continues the architecture discussion with pink handwritten annotations showing several BTS tower drawings converging on a BSC label and a top flow reading “mobile -> BTS -> BSC -> MSC.” Additional abbreviation lines include “MS -> Mobile Station” and “BSS -> BTS + BSC.” A later slide titled “Important Components of GSM” presents a grid of boxes for MS, BTS, BSC, MSC, HLR, VLR, AuC, and EIR. This section consolidates the component names and their roles, moving from the radio path to the broader set of network elements needed for switching, subscriber data, authentication, and equipment identification.

  6. 20:00 – 23:21 20:00-23:21

    The final section is titled “Channel Access in GSM,” stating that GSM uses FDMA (Frequency Division Multiple Access) and TDMA (Time Division Multiple Access). The left FDMA panel shows a spectrum bar marked Ch 1, Ch 2, Ch 3, Ch 4, Ch n with Power and Frequency axes, while the right TDMA panel shows time slots TS 1, TS 2, TS 8 and a “User 8” label. The slide then switches to two columns headed “Advantages of GSM” and “Limitations of GSM.” Visible advantages include “Supports international roaming,” “Provides better voice quality than analog systems,” and “Offers authentication and encryption,” while a limitation is “Low data transmission speed compared to modern technologies.”

The lecture follows a clear progression from definition to architecture to access methods and evaluation. It begins by defining GSM as a digital cellular standard for voice, SMS, and basic data, contrasting it with first-generation analog systems. The instructor then uses an architecture diagram to introduce network elements such as BTS, BSC, MSC, HLR, VLR, EIR, and AuC, and circles the service side involving other networks, voice calls, and SMS. The key features section organizes GSM’s design into seven numbered ideas: digital communication, SIM-based identification, voice and SMS, international roaming, FDMA/TDMA multiple access, security, and cellular architecture. The architecture portion then formalizes these ideas into three subsystems: RSS, NSS, and OSS. The RSS is explained in detail through the MS-BTS-BSC hierarchy, with board annotations showing the signal path mobile -> BTS -> BSC -> MSC and the relationship BSS = BTS + BSC. A component grid extends the discussion to MSC, HLR, VLR, AuC, and EIR, giving students a complete component map. The final part explains channel access by separating FDMA, which assigns different frequency channels, from TDMA, which divides a channel into time slots. The lecture closes with a balanced review of GSM advantages and limitations, emphasizing better voice quality, security, and roaming, while noting its low data speed relative to modern technologies. For revision, students should focus on the three subsystems, the seven key features, the component acronyms, and the FDMA/TDMA distinction.

Loading lesson…