mobile network 1

Introduction to Cellular Mobile Networks

mobile network 1

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Outline

 – Circuit Switching vs. Packet Switching

 – Multiplexing

 – Mobile Phone Standards

 – Figures

Circuit Switching

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Packet Switching

2

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5

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7

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Advantages of Packet Switching

 – More efficient use of existing carriers

 – More suited to bursty-type traffic such as Internet access.

 – Compatibility with existing packet-switched networks (PSNs) such as the Internet

Advantages of Circuit Switching

 – More suited to time-sensitive applications

 – No contention for network resources

 – Less data overheads for routing requirements

 – Compatibility with existing circuit-switched networks (eg PSTN/ISDN)

Packet Routing Strategies

Connection-Orientated (CONS):

— – Packet route established prior to data transfer

— – Supports flow control

—-  Supports QoS functions

Connectionless (CNLS)

— – No predefined route – packets routed individually

— – No guarantee of delivery

— – Difficult to implement QoS

Packet Data Delivery

Acknowledged Mode:

— – Guarantees error-free delivery

— – Supports flow control

— – Requires additional overheads

— – Lower data throughput

Unacknowledged Mode

—- Packets are delivered to the network and forgotten

—- No indication of delivery or error correction

—- Generally relies on higher layer protocols for error detection and correction

—- More efficient in reliable networks

ادامه مطلب و دانلود مقاله

References

 – A. S. Tanenbaum and D. J. Wetherall, Computer Networks (5th Edition), Pearson Education, the book slides, 2011.

 – Patrick Traynor, CS 8803 – Cellular and Mobile Network Security, Georgia Tech Information Security Center, 2012.

 – General Packet Radio Service (GPRS) For Engineers, Aircom International.

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