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Cellular Networks Lecture 6 Paul Flynn Slide 2 Cellular Telephony - Architecture Slide 3 Very Basic Cellular/PCS Architecture Base Station (BS) Mobile Station Base Station Controller Mobility Database Mobile Switching Center (MSC) Radio Network Public Switched Telephone Network Slide 4 Duplex Communication - FDD FDD: Frequency Division Duplex Base Station B Mobile Terminal M Forward Channel Reverse Channel Forward Channel and Reverse Channel use different frequency bands Slide 5 Access Methods Frequency Time Frequency Time Frequency Time FDMA TDMA CDMA Slide 6 Clusters A cluster is a group of cells No channels are reused within a cluster A seven Cell Cluster Slide 7 Example - Frequency Spectrum Allocation in U.S. Cellular Radio Service 991992 102312799991992 102312799 824-849 MHz 869-894 MHz Reverse ChannelForward Channel Channel NumberCenter Frequency (MHz) Reverse Channel 1