Podcast
Questions and Answers
What is the reason behind calling mobile phones 'cell phones'?
What is the reason behind calling mobile phones 'cell phones'?
- Because they connect to multiple networks
- Because they use a cellular network (correct)
- Because they are small and portable
- Because they contain cells inside them
Which network was a big part of the early cellular network and had about 90% market share worldwide?
Which network was a big part of the early cellular network and had about 90% market share worldwide?
- T-Mobile network
- AT&T network
- GSM (correct)
- CDMA
What type of networks were the original 2G cellular networks?
What type of networks were the original 2G cellular networks?
- Fiber optic networks
- Packet switched networks
- Hybrid switched networks
- Circuit switched networks (correct)
What technology was used to allow phone configurations to be stored on a SIM card?
What technology was used to allow phone configurations to be stored on a SIM card?
What is the main difference between GSM and CDMA?
What is the main difference between GSM and CDMA?
Which technology was developed to converge GSM and CDMA networks into one standard for data transmission?
Which technology was developed to converge GSM and CDMA networks into one standard for data transmission?
When were 3G technologies introduced?
When were 3G technologies introduced?
Which cellular network provider mainly used CDMA in the US?
Which cellular network provider mainly used CDMA in the US?
What does OTA stand for in the context of mobile communication?
What does OTA stand for in the context of mobile communication?
What feature allows phones to share cellular network connectivity with other devices using Wi-Fi?
What feature allows phones to share cellular network connectivity with other devices using Wi-Fi?
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Study Notes
- GSM (Global System for Mobile Communications) and CDMA (Code Division Multiple Access) are two different mobile communication standards.
- GSM, using multiplexing, allows multiple users to communicate over the same frequencies by dividing time slots among users.
- CDMA uses unique codes for each call to filter out irrelevant information and focus on the specific conversation.
- In the US, CDMA was mainly used by Verizon and Sprint, while GSM was popular elsewhere and with other providers.
- 3G technologies were introduced in 1998, providing enhanced capabilities and increased speeds for data communication.
- LTE (Long Term Evolution), a 4G technology, was developed to converge GSM and CDMA networks into one standard for data transmission, allowing for higher throughput (up to 150 Mbps).
- 5G (fifth generation cellular networking) was introduced in 2020, offering greatly enhanced speeds (up to 10 Gbps) and increased connectivity possibilities for Internet of Things devices.
- OTA (Over-the-Air) updates include PRL (Preferred Roaming List) updates, allowing phones to adapt to changing network conditions.
- Phones can act as Wi-Fi hotspots, sharing cellular network connectivity with other devices using Wi-Fi.
- Providers may limit or charge extra for Wi-Fi hotspot capabilities and data usage.
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