GSM. Course requirements: Understanding Telecommunications book by Ericsson (Part D PLMN) + supporting material (= these slides) GPRS
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1 GSM Example of a PLMN (Public Land Mobile Network) At present most successful cellular mobile system (over 200 million subscribers worldwide) Digital (2 nd Generation) cellular mobile system operating in several frequency bands (GSM 900, GSM 1800 = DCS 1800, GSM 1900 = PCS 1900) ETSI Specifications ( ) Future evolution?
2 GSM Course requirements: Understanding Telecommunications book by Ericsson (Part D PLMN) + supporting material (= these slides) GPRS Course requirements: GPRS: Architecture, Protocols, and Air Interface article by Bettstetter et al., available at If you have problems obtaining this article, please contact the course assistant (Mika Nupponen)
3 Digital PLMN systems (status 2001) 2 nd Generation 3 rd Generation 4 th Generation GSM IS-136 IS-95 GPRS USA EDGE IMT-2000 UMTS W- CDMA TDD CDMA 2000
4 Digital PLMN systems GSM Global System for Mobile communications: (FDMA/)TDMA-based system specified by ETSI Several evolution steps towards 3 rd generation systems: HSCSD High Speed Circuit Switched Data (possibility of combining up to 4 time slots for a data connection) GPRS General Packet Radio Service (packet switching overlay on TDMA radio access network) EDGE Enhanced Data rates for GSM Evolution (change at the air interface: GMSK => 8 PSK modulation) IS-95 American CDMA system IS-136 American TDMA system
5 UMTS Universal Mobile Telecommunications System UTRA FDD mode (UMTS Terrestrial Radio Access, Frequency Division Duplex mode) W-CDMA UTRA TDD mode CDMA2000 American 3 rd Generation CDMA system IMT-2000 International Mobile Telecommunications (ITU) Other wireless systems & networks: DECT (no roaming), TETRA (not public), HIPERLAN et al., UPT concept, GPS, mobile satellite systems
6 GSM system architecture BSS NSS ME SIM MS BTS BSC MSC VLR NMS GMSC HLR MS MS BTS OMC database AuC EIR
7 GSM: circuit switched connections BSS NSS MS BSC MSC VLR GMSC HLR MS BTS AuC EIR
8 GPRS: packet switched connections BSS NSS MS BSC PCU MSC VLR GMSC HLR MS BTS SGSN GGSN AuC EIR
9 UMTS network architecture UE Uu Radio access network UTRAN BS RNC Iur Core network (GSM/GPRS-based) Iu CS GMSC MSC VLR UE BS Iub RNC Iu PS SGSN HLR AuC UE Gn GGSN EIR
10 Radio interface aspects Radio access techniques (FDMA / TDMA / CDMA) Physical / logical channel structure / GSM burst Modulation method (GMSK, 8-PSK) Source coding / channel coding / interleaving Radio channel estimation & equalization techniques (constructive use of the multipath channel) Diversity techniques Circuit vs. packet switched access Protocols: random access, power control, handover (with associated measurement procedures)
11 Radio interface multiple access techniques frequency Time division time code nr. Frequency division Code division
12 Radio interface channel structure Physical channel: Repetitive timeslot (e.g. TS3) on a certain carrier (e.g. Carrier 4) with capacity of 22.8 kbit/s Logical channel: A physical channel can contain (several combinations of) one or more logical channels In 3G, we have physical channels, transport channels and logical channels
13 Radio interface - physical channels Carrier 0 Carrier 1 Carrier 2 Carrier 3 TS0 Typically used for signaling TS1 T S S T T T T T T S S T T T T T T T T T T T T T TS2 TS2 T T T T T T T T T T T T T T T T T T T T T T T T Frame of length 8 time slots
14 Radio interface logical channels Traffic channels Control channels (for signaling) TCH/F Broadcast Common control Dedicated TCH/H SCH PCH SDCCH bidirectional downlink uplink FCCH BCCH AGCH RACH SACCH FACCH
15 GPRS channel structure Carrier 0 TS0 Used for GSM signaling TS1 T S S T T T T T T S S T Carrier 1 Carrier 2 T T T T T T T PDCH:s for GPRS use (for example) T T T T T T T PBCCH Packet Broadcast Control Channel (optional) PCCCH Packet Common Control Channel (optional) PDTCH Packet Data Traffic Channel Also, PACCH and PTCCH possible
16 GSM/GPRS channel allocation example TS7 Only for GPRS TS0 Dynamical allocation (circuit switched GSM channels are given higher priority) time (observation intervals) Allocation schemes are network operator dependent
17 GSM radio interface GSM normal burst: bits (0.577 ms) 3 57 encrypted bits 1 26 training bits 1 57 encrypted bits TDMA frame (4.615 ms): traffic or signaling info in burst? TS7 TS0 TS1 TS2 TS3 TS4 TS5 TS6 TS7 TS0 TS1 TDMA multiframe: SACCH = 26 TDMA frames (in case of TCH) Idle
18 GSM speech encoding Voice coding: 260 bits in 20 ms blocks (13 kbit/s) MS - TRAU 260 bits 260 bits Channel coding: 456 coded bits (22.8 kbit/s) 456 bits Interleaving: 8 x 57 bits (22.8 kbit/s) MS - BTS bits 4, 12, 20, 28, 36, 44, etc. from the 456 bit frame 57 bits 57 bits 57 bits
19 Task division between BSC and TRAU (TRAU = Transcoding and Rate Adaptation Unit) BSS NSS MS BSC signaling TRAU MSC VLR MS BTS conventional 64 kbit/s PCM signal 13 kbit/s signal can be packed into 16 kbit/s frame for efficient transport
20 GSM signaling message encoding Signaling message is segmented into blocks of 184 bits: 184 bits Each block is coded into 456 bits (22.8 kbit/s) 456 bits Interleaving: 8 x 57 bits (22.8 kbit/s) bits 4, 12, 20, 28, 36, 44, etc. from the 456 bit frame 57 bits 57 bits 57 bits
21 GPRS packet encoding FH For instance, segment of IP packet FCS LLC frame Segment Segment Segment. Segment BH Info BCS T RLC block Convolutional encoding into 456 bits Interleaving: 8 x 57 bits (22.8 kbit/s) bits 4, 12, 20, 28, 36, 44, etc. from the 456 bit frame 57 bits 57 bits 57 bits
22 GSM protocols (MS MSC) U m A bis A CM CM MM DTAP RR LAPDm RR LAPDm BTSM LAPD RR BTSM LAPD MM BSSMAP BSSAP BSSAP SCCP MTP SCCP MTP Radio Radio 64 kb/s 64 kb/s 64 kb/s 64 kb/s MS BTS BSC MSC
23 GPRS protocols (user plane) U m G b G n IP/X.25 IP/X.25 SNDCP SNDCP GTP GTP LLC LLC TCP TCP RLC RLC BSSGP BSSGP IP IP MAC MAC NS NS L2 L2 Radio Radio L1bis L1bis L1 L1 MS BSS SGSN GGSN
24 GSM signaling at layer 3 RR (Radio Resource management) Random access and initial assignment (reserving a SDCCH for signaling purposes) Handover management Ciphering (encryption) over radio interface MM (Mobility Management) IMSI Attach (MS power switch on) IMSI Detach (MS power switched off) Location updating (MS moves to other Location Area) Authentication
25 GSM signaling at layer 3 CM (Connection Management) Signaling for management of circuit and packet switched connections, can be divided into: CC (Call Control) Signaling for setting up and releasing circuit switched connections (very similar to DSS 1 in N-ISDN) SM (Session Management) Signaling for management of PDP Contexts (packet switched connections in GPRS)
26 MM Areas in GSM and GPRS Cell Location Area (LA) Routing Area (RA) Location updating in GPRS Location updating in GSM
27 Connectivity types in GSM and GPRS GSM: Disconnected Idle Connected GPRS: Idle Standby Ready MS is switched off (circuit mode) location updates on LA basis handovers in c.s. connection MS is switched off (packet mode) location updates on RA basis location updates on cell-by-cell basis
28 Trade-off when choosing LA/RA size LA/RA size is very large (e.g. whole mobile network) + location updates not needed very often paging load is very heavy Affects capacity LA/RA size is very small (e.g. single cell) + small paging load location updates must be done very often Affects signaling load
29 Random access in GSM / GPRS No communication between MS and network can be started without first using the random access procedure in network originated activity (paging, e.g. for MTC) MS originated activity (MOC, location updating, registration, de-registration at power switch-off) 1) MS sends a short access burst over the RACH (uplink), (Slotted Aloha, collision possibility retransmission) 2) Network (BSC) returns permission message including: - allocated channel (frequency, time slot) - timing advance for correct time slot alignment
30 Important identifiers in GSM IMSI International Mobile Subscriber Identity (global) TMSI Temporary Mobile Subscriber Identity (local and temporary) Location Area Identity (global) MSISDN Mobile Subscriber ISDN number (address of subscriber HLR database) PIN Personal Identification Number (only within MS) IMEI International Mobile Equipment Identity (global) Temporary, local numbers for routing (MSRN, HON )
31 Case study: location updating (1) ME SIM TMSI same? VLR 1 TMSI IMSI (most generic scenario is described here) HLR IMSI => VLR 1 VLR 2 Last and TMSI stored in SIM. MS monitors broadcast. comparison in MS => ok!
32 Case study: location updating (2) ME SIM same? VLR 1 TMSI IMSI HLR TMSI IMSI => VLR 1 VLR 2 different => location update needed!
33 Case study: location updating (3) ME SIM TMSI VLR 1 TMSI IMSI HLR IMSI => VLR 1 VLR 2 TMSI SIM sends old and TMSI to VLR 2 But, VLR 2 does not know IMSI!
34 Case study: location updating (4) ME SIM TMSI VLR 2 TMSI VLR 1 TMSI IMSI => VLR 2 HLR IMSI => VLR 1 => VLR 2 TMSI VLR 2 sends new to VLR 1 which in turn updates the HLR
35 Case study: location updating (5) ME SIM TMSI VLR 1 HLR IMSI => VLR 2 VLR 2 TMSI IMSI HLR sends IMSI to VLR 2 and cancels subscriber data in VLR 1
36 Case study: location updating (6) VLR 1 ME SIM TMSI HLR IMSI VLR 2 Important information for MTC (see below) VLR 2 TMSI IMSI VLR 2 sends new TMSI to MS (SIM). MS also updates. Compare with slide (1). Location update successful!
37 Case study: mobile terminated call (1) (mobile terminated call = MTC) ME SIM TMSI MSC VLR TMSI => IMSI HLR IMSI => VLR GMSC MSISDN MTC is directed through PSTN to GMSC using MSISDN. GMSC contacts HLR (MSISDN in fact points to the HLR database of this subscriber containing IMSI,, etc.)
38 Case study: mobile terminated call (2) ME SIM TMSI MSC VLR TMSI => IMSI HLR IMSI => VLR GMSC MSISDN => VLR 2 HLR returns to GMSC the current of called mobile subscriber. The GMSC can now route the call to the MSC serving the subscriber
39 Case study: mobile terminated call (3) ME SIM TMSI MSC VLR TMSI => IMSI HLR IMSI => VLR GMSC The MSC broadcasts a paging message (including TMSI) within the location area defined by
40 Case study: mobile terminated call (4) ME SIM TMSI MSC VLR TMSI => IMSI HLR IMSI => VLR GMSC Only the mobile subscriber with the correct TMSI reacts to the paging. A connection between MS and MSC is established and the call set-up is completed.
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