Higher data rates to support multimedia applications, high spectral efficiency, standardize as many interfaces as possible, and provide compatibility to services within the IMT-2000.
Improved voice quality (wireline quality)
Data rates up to 384 kbps everywhere and 2 Mbps indoor
Support for packet and circuit switched data services
Seamless incorporation of existing 2G and satellite systems
Seamless international roaming
Support for several simultaneous multimedia connections
Comparison of 2G and 3G Systems Digital Technology Environments Frequency Bands Services Roaming Modulation, Speech, Channel Coding Vehicular, Pedestrian, FWA 800MHz, 900MHz, 1.5GHz, 1.8GHz Low/Medium Rates; Primarily Voice, Data Restricted Increased Use also Software Radios Vehicular, Pedestrian, Office, FWA, Satellite 2 GHz Higher Data Rates; Circuit/Packet Switched and Multimedia Services Global Roaming 2G 3G
UMTS (Universal Mobile Telecommunications System) is the European version of a 3 rd Generation (3G) mobile communication system.
It is proposed by 3GPP (3 rd generation partnership project).
It includes two parts: UTRAN (Universal Terrestrial Radio Access Network) and the Core network inherited from GSM (Global System for Mobile Communications).
UMTS is a wideband, circuit- and packet-based transmission systems of text, digitized voice, video, and multimedia with data rates up to 2 Mbps (possibly higher).
UMTS Services and Their Relationship to the Internets ISP, portal, database server MP3, MPEG-4, FTP, IP-based SIP File transfer, streaming Audio, video, download ISP, email, SMS-server SMTP, SMS, IP SMS, e-mail, downloading Multimedia messaging Media gateway SIP Interactive/dialog streaming/one-way Voice, real-time audio, video ISP, portal IP, higher layers transparent All types-transparent tunnel Internet access ISP, firewall server, corporate portal IP, higher layers transparent All types-transparent tunnel Intranet access (mobile VPN), mobile office, mobile commerce ISP, portal, servers HTTP, WML, cHTML, xHTML WWW Location-based info- and entertainment Internet Elements Protocols Session Type Service Category
Maximum data rate and maximum speed for different hierarchical layer
Macrolayer: 144 kbps with max. speed of 500km/h.
Microlayer: 384 kbps with max speed of 120km/h
Picolayer: 2Mbps with 10km/h
Bit Error Rate (BER)
Real-time applications: 10 -3 to 10 -7 with maximum constant delay: 20ms to 300 ms
No real-time applications: 10 -5 to 10 -8 with maximum delay >= 150ms.
Spectrum: 1900 MHz-2025 MHz, and 2110 -2200 MHz
FDD (macro- and micro- cells: uplink is from 1920 MHz to 1980 MHz, downlink is from 2110 MHz to 2170 MHz
TDD (pico- cells: not divided by use of different frequency carriers (not suitable for large prop delays).
Network Architecture UMTS Subscriber Identity module Mobile equipment User equipment Radio Network controller Radio Network controller Node B Node B Node B VLR GMSC HLR MSC SGSN GGSN Internet PSTN ISDN UTRAN CN
ODMA (Opportunity Driven Multiple Access) Random Access Channel (ORACH)
Common Packet Channel (CPCH)
Forward Access Channel (FACH)
Downlink Shared Channel (DSCH)
Uplink Shared Channel (USCH)
Broadcast Channel (BCH)
Paging Channel (PCH)
Dedicated Transport Channel Types
Dedicated Channel (DCH)
Fast Uplink Signaling Channel (FAUSCH)
ODMA Dedicated Channel (ODCH)
Transport Channels in UTRAN
Logical Channels in UTRAN Broadcast Control Channel (BCCH) Paging Control Channel (PCCH) Dedicated Control Channel (DCCH) Common Control Channel (CCCH) Control Channel (CCH) Dedicated Traffic Channel (DTCH) Traffic Channel (TCH) ODMA Dedicated Control Channel (ODCCH) ODMA Common Control Channel (OCCCH) ODMA Dedicated Traffic Channel (ODTCH) Common Traffic Channel (CTCH) Shared Channel Control Channel (SHCCH)
Radio connection and an RB are two separate concepts in UMTS.
Radio connection is a static concept. It is established once, and survives until it is released. There is only one radio connection per terminal.
The RB defines what kind of properties this radio connection has. There may be several RBs on one radio connection, each having different capabilities for data transfer. The capabilities are based on the QoS parameters.
The UTRAN air interface is very flexible, which allows for the dynamic allocation of system resources.
In the connected mode, the UE may be required to perform traffic volume measurements in its MAC layer. If the UE suspects that the present configuration is not the optimal one, it sends a measurement report to the network.
The network can trigger a channel-reconfiguration procedure.