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Questions and Answers
What is the ratio of mobile phone subscribers to fixed phone subscribers as of 2019?
What is the ratio of mobile phone subscribers to fixed phone subscribers as of 2019?
Which technology is associated with higher transmission rates among wireless links as listed?
Which technology is associated with higher transmission rates among wireless links as listed?
What is the primary function of a base station in a wireless network?
What is the primary function of a base station in a wireless network?
In which network topology does a base station play a critical role?
In which network topology does a base station play a critical role?
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What is a significant challenge in wireless and mobile networks?
What is a significant challenge in wireless and mobile networks?
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How do wireless hosts connect to the Internet?
How do wireless hosts connect to the Internet?
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Which of the following wireless technologies has the lowest maximum transmission rate?
Which of the following wireless technologies has the lowest maximum transmission rate?
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What occurs when a mobile user switches from one base station to another?
What occurs when a mobile user switches from one base station to another?
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What does the abbreviation 'SDN' stand for in relation to wireless networks?
What does the abbreviation 'SDN' stand for in relation to wireless networks?
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Which wireless protocol supports up to 14 Gbps connection speeds?
Which wireless protocol supports up to 14 Gbps connection speeds?
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Study Notes
Introduction to Wireless and Mobile Networks
- Mobile phone subscribers outnumber fixed phone subscribers by a ratio of 10-to-1 as of 2019.
- There were five times more mobile-broadband-connected devices compared to fixed-broadband-connected devices in 2019.
- 4G and 5G cellular networks utilize the Internet Protocol stack and support Software-Defined Networking (SDN).
- Key challenges in wireless and mobile networks include communication via wireless links and managing users' mobility as they switch network connections.
Chapter 7 Outline
- Covers various aspects of wireless and mobile networks, including characteristics of wireless links, WiFi standards, and cellular network developments.
- Explores mobility management principles and practices within 4G and 5G technologies.
- Discusses Mobile IP and the implications of mobility on higher-layer protocols.
Elements of a Wireless Network
- Comprises a wired network infrastructure integrated with wireless hosts such as laptops, smartphones, and IoT devices, which can be stationary or mobile.
- Includes a base station that connects to the wired network and facilitates communication between wireless hosts and the network.
- Base stations can be cell towers or 802.11 access points providing network access.
- Wireless links connect mobile devices to base stations and may also serve as backbone connections, utilizing various access protocols.
Characteristics of Selected Wireless Links
- 802.11ax: Maximum speed of 14 Gbps.
- 5G: Capable of speeds up to 10 Gbps.
- 802.11ac: Provides speeds of 3.5 Gbps.
- 802.11af, ah: Maximum speeds of 600 Mbps.
- 4G LTE: Offers speeds around 54 Mbps.
- 802.11g: Speed up to 11 Mbps.
- 802.11b: Limited to 2 Mbps.
- Bluetooth: Also provides speeds up to 2 Mbps.
Wireless Network Topologies
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Infrastructure Mode:
- Involves a base station that connects mobile devices to the wired network; handoffs manage user movement between base stations.
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Ad Hoc Mode:
- Operates without a base station, allowing nodes to communicate directly with one another and form networks autonomously.
Wireless Network Taxonomy
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Single Hop:
- Connection from a host to a base station (WiFi or cellular), which then links to the Internet.
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Multiple Hops:
- Involves relaying connections through multiple wireless nodes, creating a mesh network to access the Internet.
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No Base Station, No Connection to Larger Internet:
- Characteristic of Bluetooth and ad hoc networks, often used for localized communication without broader Internet access.
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Description
Explore the fundamental concepts of wireless and mobile networks, including the rise of mobile phone subscribers compared to fixed connections. Understand the implications of 4G and 5G technologies and the challenges faced in communication and mobility. This quiz covers the essentials of network protocols and user mobility in modern telecommunications.
