Cellular Digital Packet Data (CDPD) - Bnrg.cs.berkeley.edu ...

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CDPD Protocols• Physical Layer– GMSK modulation, raw data rate = 19.2 Kbps;Actually data rate will be (much) less– Restricted to using pair of analog or digital TDMA cellularvoice frequency pairs for each physical CDPD channel– Physical layer services:» Tune to specified pair of RF channels» Transmit/receive bits» Set power levels» Measure signal strengths» Suspend/resume monitoring of RF channels in M-ESto conserve battery power12
CDPD Protocols• MAC Layer– Arbitrate access to shared medium between M-ES andMD-BS– Frame recognition, frame delimiting, error detection/correctionMD-ES MD-ES MD-ESMD-BSForward LinkReverse LinkForward link: scheduled by BS, signals channel idle/busyReverse link: contention access with back-off13
Page 1 and 2: CS 294-7: Cellular Digital PacketDa
Page 3 and 4: Cellular Digital Packet DataISInter
Page 5 and 6: CDPD Network ArchitectureColor Code
Page 7 and 8: CDPD Entities• Fixed End Systems
Page 9 and 10: CDPD Entities• Mobile Data Base S
Page 11: CDPD ProtocolsNetwork Layer DataNet
Page 15 and 16: CDPD Protocols• Mobile Data Link
Page 17 and 18: Mobile Network RegistrationProtocol
Page 19 and 20: M-ES Channel Hopping• Initiation
Page 21 and 22: Network Layer Mobility:CDPD vs. Mob
Page 23 and 24: Network Layer Mobility:CDPD vs Mobi

Cellular Digital Packet Data (CDPD) - Bnrg.cs.berkeley.edu ...

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