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1 UMTS
2 Generations of mobile systems Generation 1 ( ) 2 ( ) 2,5 ( ) 3 ( ?) Names NMT (Nordic Mobile Telephone); 450 MHz, 900 MHz AMPS (Advance Mobile Telephone System); USA TACS (Total Access Communication System); UK, I, SP, Radiocom2000; FR GSM (Global System for Mobile communications) -GSM 900 -GSM 1800 (DCS, Digital Communication System) DAMPS (Digital AMPS, also know as IS136) PCS 1900 (Personal Communication System), based on DCS GSM variant in USA IS95 (Interim Standard) based on CDMA -IS95a,b is also referred as cdmaone PDC (Personal Digital Communication), closed to DAMPS GPRS/ (General Packet Radio Service) EGPRS/EDGE (Enhanced GPRS/Enhanced Data rates for Global Evolution) cdma2000 -cdma2000 1xEV-DO (cdma2000 Evolution-Data Only) -cdma2000 1xEV-DV (cdma2000 Evolution-Data/Voice) UMTS (Universal Mobile Telecommunication System) Features Analogue systems National systems Voice Optimized for voice traffic Digital systems FDMA/TDMA/CDMA Voice + data Voice + data Multimedia 2007, November -R. Bestak 2
3 3GPP (3 rd Generation Partnership Project) Created 1998 Association of standardization bodies & forums ETSI (Europe), ARIB (Japan), ATIS (USA), CCSA (Chine), etc. UMTS forum, IPv6 forum, etc. Specification of UMTS ( and EDGE) 3GPP RAN TSG CN and Terminals TSG Services and System Aspect TSG GERAN TSG TSG -Technical Specification Groups 2007, November -R. Bestak 3
4 Releases in UMTS Release 99 (1999) First Release Release 4 (2001) Release 5 (2002) HSDPA (High Speed Downlink Packet Access) IMS (IP Multimedia Subsystem) Release 6 (2004) MBMS(Multimedia Broadcast/Multicast Services) HSUPA (High Speed Uplink Packet Access) Release 7 (2007?) HSPA+ Release 8 (?) LTE (Long Term Evolution) 2007, November -R. Bestak 4
5 Frequency bands (Europe) Mode Uplink Downlink Band UMTS-FDD MHz MHz MHz UMTS-TDD Satellite MHz MHz MHz MHz MHz MHz The frequency bands were specified in 1992 In 2000, additional frequency bands MHz, MHz MHz GSM Europe GSM 1800 DECT UMTS TDD UMTS FDD UMTS Satellite UMTS TDD UMTS FDD UMTS Satellite UMTS [MHz] 2007, November -R. Bestak 5
6 Features Several simultaneous radio connections per user High adaptability of radio connections Setting of connections according to supported services Wide range of services with different QoS Voice, web, , video/audio streaming, etc. UMTS allows good support for existing and for future services 144 kbit/s 384 kbit/s 2 Mbit/s 14 Mbit/s 5,8 Mbit/s Rural outdoor environments Urban outdoor environments Indoor and low range outdoor environments HSDPA * HSUPA** *HSDPA (High Speed Downlink Packet Access) **HSUPA (High Speed Uplink Packet Access) 2007, November -R. Bestak 6
7 WCDMA subscribers # Subscribers: 177 mil. # Networks Launched: 82 (11/2007) 2007, November -R. Bestak 7
8 Network architecture
9 UMTS architecture (1/3) Air interface WCDMA (Wideband Code Division Multiple Access) Radio channel 5 MHz New or enhanced protocols on the radio interface Core network based on the GSM/GPRS core network 2007, November -R. Bestak 9
10 UMTS architecture (2/3) UE UTRAN CN External Network UE: User Equipment UTRAN: UMTS Terrestrial Radio Access Network, (or RAN) CN: Core Network 2007, November -R. Bestak 10
11 UMTS architecture (3/3) UE Node B RNC Node B MSC/ VLR GMSC PLMN, ISDN HLR SGSN GGSN Internet UE UTRAN CN External Network UE: User Equipment MSC: Mobile Switching Centre SGSN: Serving GPRS Support Node RNC: Radio Network Controller VLR: Visitor Location Register GMSC:Gateway MSC HLR: Home Location Register GGSN: Gateway GPRS Support Node 2007, November -R. Bestak 11
12 GPRS vs. UMTS (1/2) MS Um (Air) BTS BTS Abis BSC BSC A Gs MSC/ VLR MSC/ VLR E Gr PSTN D HLR GMSC C Gc PLMN, ISDN SGSN GGSN Internet Gb Gn 2007, November -R. Bestak 12
13 GPRS vs. UMTS (2/2) UE Uu Iub Iu Node B RNC Node B Iur Iu-CS Gs MSC/ VLR MSC/ VLR E Gr PSTN D HLR C Gc GMSC PLMN, ISDN SGSN GGSN Internet Iu-PS Gn 2007, November -R. Bestak 13
14 UTRAN evolutions IP transport in UTRAN ( instead of ATM) Iur/Iub, Iu-CS Iu flex (flexible) RNC have more than one Iu-CS/Iu-PS interfaces with CN HSPA HSDPA, HSUPA RNC MSC/ VLR UE NodeB RNC MSC/ VLR 2007, November -R. Bestak 14
15 CN evolutions (1/2) Iu-CS MSC server GMSC server HSS Data & control Control Iu-CS MGW MGW PSTN UTRAN Iu-PS SGSN GGSN Internet Elements for provision of IP multimedia services (audio, video, chat, etc.) delivered over the PS. MRF CSCF MGCF IMS MGM: Media Gateway HSS: Home Subscriber Server IMS: IP Multimedia Subsystem MRF: Media Resource Function CSCF: Call Session Control Function MGCF: Media Gateway Control Function 2007, November -R. Bestak 15
16 CN evolutions (2/2) MSC, GMSC servers Provide control functionalities ( data through MGW) One MSC, GMCS server can control several MGWs When data rates increase, only the number of MGWs need to be increased HSS Instead of HLR (mobility management, security, identification, etc.) MRF Setting up multimedia connections CSCF Switching of multimedia connections and their management MGCF Handling of protocol conversion between ISUP and IMS call control protocols Exchange of signalling related to IP services between UMTS and CS networks 3GPP , November -R. Bestak 16
17 Protocol architecture of UTRAN
18 Protocol architecture (1/2) Control plane User plane Layer 3 Layer 2 control Radio Resource Control PDCP BMC Radio Link Control (RLC) Logical channels Layer 1 Medium Access Control (MAC) Physical Layer (PHY) Transport channels Physical channels PDCP: Packet Data Convergence Protocol BMC: Broadcast/Multicats Control Protocol 2007, November -R. Bestak 18
19 Protocol architecture (2/2) RRC PDCP BMC RRC PDCP BMC RLC RLC MAC MAC Phy Phy UE NodeB RNC 2007, November -R. Bestak 19
20 Data transmission in UMTS UE NodeB RNC Server TCP/UDP Radio Access Network Proxy TCP/UDP IP IP IP RRC PDCP RLC RRC PDCP RLC Core Networks +Internet MAC MAC Phy Phy 2007, November -R. Bestak 20
21 MAC Medium Access Control Functions Mapping Logical channels Transport channels Multiplexing/Demultiplexing RLC blocks transport blocks Scheduling Data flows of one UE UEs Traffic measurement Status of RLC transmission buffer Ciphering TM RLC mode... Control plane User plane RRC PDCP BMC RLC MAC PHY 2007, November -R. Bestak 21
22 MAC entities MAC entity Transport channel Release MAC-b Broadcast ch. BCH (Broadcast channel) Rel 99 MAC-c/sh/m Common ch. PCH (Paging channel) FACH (Forward Access channel) RACH (Random Access channel) Rel 99 DSCH (Downlink Shared channel) USCH (Uplink Shared channel) MAC-d Dedicated ch. DCH (Dedicated channel) Rel 99 MAC-hs HSDPA HS-DSCH (HS Downlink Shared channel) Rel 5 MAC-e/es HSUPA E-DCH (Enhanced Dedicated channel) Rel 6 MAC-m Common ch. FACH (Forward Access channel) MBMS * Rel 6 * MBMS Multimedia Broadcast Multicast Service 2007, November -R. Bestak 22
23 MAC entities - UE MTCH MSCH MTCH MSCH MCCH PCCH BCCH CCCH CTCH SHCCH ( TDD only ) MAC Control DCCH DTCH DTCH MAC-d MAC-es / MAC-e MAC-m MAC-hs MAC-c/sh/m Associated Downlink Signalling E-DCH Associated Uplink Signalling FACH HS-DSCH PCH Associated Associated Downlink Uplink Signalling Signalling FACH FACH RACH USCH ( TDD only ) USCH ( TDD only ) DSCH ( TDD only ) DSCH ( TDD only ) DCH DCH 2007, November -R. Bestak 23
24 MAC entities - UTRAN Node B RNC 2007, November -R. Bestak 24
25 RLC Radio Link Control Functions Segmentation/Reassembly Upper layer blocs RLC blocks Error corrections ARQ (Selective Repeat) Flow control In-sequence delivery to upper layer Ciphering Protocol error detection and recovery Control plane User plane RRC PDCP BMC RLC MAC PHY 2007, November -R. Bestak 25
26 BMC Broadcast/Multicast Control protocol Functions Storage of cell broadcast messages Scheduling of BMC messages Transmission of BMC messages to UEs... Control plane RRC User plane PDCP BMC RLC MAC PHY 2007, November -R. Bestak 26
27 PDCP Packet Data Convergence Protocol Functions Compression (decompression) of TCP/IP & RTP/UDP/IP headers Control plane RRC User plane PDCP BMC RLC MAC PHY 2007, November -R. Bestak 27
28 RRC Radio Resource Control protocol Control plane Control all lower layer RRC units Signaling of RRC Signaling of upper layer (Mobility & Session manag., Call control, etc.) Functions Controls measurements Establishment/maintenance/release RRC conn. Power control... Control plane User plane RRC PDCP BMC RLC MAC PHY 2007, November -R. Bestak 28
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