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

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CDPD Protocols• MAC Layer (continued)– Forward channel:» Data packets “broadcast” from BS to ESHDLC, zero insertion, frames segmented into 274 bit(+8 bit color code) blocks, extended with ECC to 378 bits» Forward channel sync word, reverse channel busy/idle flag,decode failure flags, 378 RS (63, 47) block– Reverse channel:» DSMA/CD access strategy» 378 bit blocks/up to 64 of these per burst» M-ES will back off and retry whenever it senses decode failureflag on the forward channel14
CDPD Protocols• Mobile Data Link Protocol (MDLP)– Point (MDIS) to multipoint (M-ES), connection-oriented,fully sequenced, acknowledged transfers– Functions provided include:» One or more logical data link connections on achannel stream» Sequence control» Transmission/format/operational error detection andrecovery—retransmits missing blocks» Flow control» Sleep function for power conservation» Dynamic address assignment (Temporary EquipmentID--TEI)15
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 and 12: CDPD ProtocolsNetwork Layer DataNet
Page 13: CDPD Protocols• MAC Layer- Arbitr
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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