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?