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+Cellular Acronym Evolution
+==========================
+Harald Welte
+:copyright: Harald Welte (Liense: CC-BY-SA)
+:backend: slidy
+:max-width: 45em
+
+== Classic GSM
+
+GSM:: Global System for Mobile Communications (was: Groupe Special Mobile)
+
+Network is split in
+
+BSS:: Base Station Subsystem
+NSS:: Network Switching Subsystem
+
+== Classic GSM Networks: Subscriber Side
+
+ME:: Mobile Equipment
+SIM:: Subscriber Identity Module
+MS:: Mobile Station (ME + SIM)
+
+Um:: User interface (mobile)
+
+== Classic GSM Networks: BSS
+
+BSS:: Base Station Subsystem
+
+BTS:: Base Transceiver Station
+Abis:: Interface BTS - BSC
+BSC:: Base Station Controller
+A:: Interface BSC - MSC
+
+== Classic GSM Networks: NSS
+
+MSC:: Mobile Switching Center
+VLR:: Visitor Location Register
+HLR:: Home Location Register
+SMSC:: SMS Service Center
+
+== GPRS extends GSM
+
+CCU:: Circuit Control Unit
+PCU:: Packet Control Unit
+Gb:: Interface PCU - SGSN
+SGSN:: Serving GPRS Support Node
+GGSN:: Gateway GPRS Support Node
+
+== UMTS
+
+UMTS:: Univesal Mobile Telephony System
+WCDMA:: Wideband Carrier Division Multiple Access
+
+Network is split in RAN + CN
+
+RAN:: Radio Access Network
+CN:: Core Network
+
+== UMTS Subscriber Side
+
+ME:: Mobile Equipment (no change)
+UICC:: Univresal Integrated Chip Circuit
+USIM:: UMTS SIM (Application on UICC), successor of SIM
+UE:: User Equipment (Successor of MS)
+
+Uu:: User interface, universal. Successor of Um
+
+== UMTS Radio Access Network (RAN)
+
+RAN:: Successor of BSS
+GERAN:: GPRS/EDGE RAN (legacy part)
+UTRAN:: Universal Telephony RAN (UMTS RAN)
+NodeB:: Successor of BTS
+Iub:: Interface NodeB - RNC (Successor of Abis)
+RNC:: Successor of BSC
+Iu-CS:: Interface RNC - MSC (Successor of A)
+Iu-PS:: Interface RNC - SGSN (Successor of Gb)
+
+== UMTS Core Netwokr (CN)
+
+MSC:: Mobile Switching Center
+VLR:: Visitor Location Register
+HLR:: Home Location Register
+SMSC:: SMS Service Center
+SGSN:: Serving GPRS Support Node
+Gn:: Interface between SGSN and GGSN
+GGSN:: Gateway GPRS Support Node
+
+(no acronym changes)
+
+== UMTS Release 4
+
+The MSC functionality is split between control and user plane;
+
+MSS:: Mobile Switching Center Server
+MGW:: Media GateWay
+
+== LTE (Long Term Evolution)
+
+After your network is already universal, what else can happen? It
+*evolves*...
+
+LTE UE:: UserEquipment (no rename)
+LTE Uu:: LTE User interface (universal)
+E-UTRAN:: Evolved UTRNA (successor to UTRAN)
+eNodeB:: Evolved NodeB (successor to NodeB)
+S1:: Interface between eNodeB and MME (successor to Iu-PS)
+
+== LTE (Long Term Evolution)
+
+MME:: Mobility Management Engine (partial successor to SGSN)
+S11:: Interface between MME and S-GW
+S-GW:: Serving GateWay (partial successor to SGSN)
+S5:: Interface between S-GW and P-GW (successor to Gn)
+P-GW:: Packet Data Network GateWay (successor to GGSN)
+
+(RNC has completely been removed, eNodeBs arrange hand-overs directly
+among each other)
+
+== Radio Interface Protocol Stacks
+
+[options="header"]
+|===
+| GSM | GPRS | UMTS | LTE
+| - | SNDCP | PDCP | PDCP
+| RR | GRR | RRC | LTE RRC
+| LAPD | RLC/MAC | RLC/MAC | LTE RLC/MAC
+| Um | Um | Uu | LTE Uu
+|===
+
+== Radio Interface Logical Channels
+
+[options="header"]
+|===
+| GSM | GPRS | UMTS | LTE
+| BCCH | (P)BCC | BCCH | BCCH
+| CCCH | (P)CCCH | CCCH | CCCH
+| SDCCH | - | DCCH | DCCH
+| TCH | - | DTCH | DTCH
+| - | PCCH | PCCH | PCCH
+|===
+
+In GSM, logical channels are directly on top of the physical layer,
+while UMTS and LTE introduce complex physica and transport channel
+concepts underneath the logical channel.
+
+==  UMTS Physical / Transport / Logical Channels
+
+image::765px-UMTS_Channels.svg.png[]
+
+By Timothy Colgan - Own work, CC BY-SA 3.0,
+https://commons.wikimedia.org/w/index.php?curid=19454393
+
+
+== The End
+
+Questions?