• Document: Lecture 13 UMTS Long Term Evolution. I. Tinnirello
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Lecture 13 UMTS Long Term Evolution I. Tinnirello Beyond 3G International Mobile Telecommunications (IMT)-2000 introduced global standard for 3G Systems beyond IMT-2000 (IMT-Advanced) are set to introduce evolutionary path beyond 3G Mobile class targets 100 Mbps with high mobility and nomadic/local area class targets 1 Gbps with low mobility 3GPP and 3GPP2 are currently developing evolutionary/revolutionary systems beyond 3G 3GPP Long Term Evolution (LTE) 3GPP2 Ultra Mobile Broadband (UMB) IEEE 802.16-based WiMax is also evolving towards 4G through 802.16m I. Tinnirello 3GPP Evolution Release 99 (Mar 2000): UMTS/WCDMA Release-5 (Mar 2002): HSDPA Release-6 (Mar 2005): HSUPA Release-7 (2007): DL MIMO, IMS (IP Multimedia Subsystem), optimized realt time services (VoIP, gaming, push-to-talk) Long Term Evolution (LTE) 3GPP work started in Nov 2004 Standardized in the form of Release 8 Spec finalized and approved in Jan 2008 Target deployment starting from 2010 LTE-Advanced study in progress I. Tinnirello IEEE 802.16 Evolution 802.16 (2002): Line-of-isght fixed operation in 10 to 66 GHz 802.16a (2003): Air interface support fro 2 to 11 GHz 802.16d (2004): Minor improvements 802.16e (2006): Support for vehicular mobility and asymmetrical links 802.16m (2011): Higher data rate, reduced latency, efficient security mechanisms I. Tinnirello Requirements of LTE Peak data rate 100 Mbps DL/50 Mbps UP within 20 MHz bandwidth Up to 200 active users in a cell (5 MHz) Less than 5 ms user-plane latency Mobility Optimized for 0-15 Km/h 15-120 Km/h supported with high performance Supported up to 350 Km/h or even up to 500 Km/h Enhanced multimedia broadcast multicast service (E-MBMS) Spectrum flexibility: 1.25-20 MHz Enhanced support for end-to-end QoS I. Tinnirello LTE Enabling Technologies OFDM (Orthogonal Frequency Division Multiplexing) SC-FDMA (Single Carrier FDMA) MIMO (Multi-input Multi-output) Multicarrier channel-dependent resource scheduling Fractional frequency reuse I. Tinnirello LTE Enabling Technologies Single Carrier FDMA (SC-FDMA) A new multiple access technique which has similar structure and performance to OFDMA Linearly pre-coded OFDMA Utilizes single carrier modulation and orthogonal frequency multiplexing using DFT-spreading in the transmitter and frequency domain equalization in the receiver Low PAPR respect to OFDMA H.G: Myung et al, “Single Carrier FDMA for Uplink wireless transmission”; IEEE Vehic. Tech. I. Tinnirello Key Features of LTE Multiple access scheme DL: OFDMA; UP: SC-FDMA Adaptive modulation and coding DL/UP modulations: QPSK, 16QAM and 64QAM Convolutional codes and Rel-6 turbo codes Advanced MIMO spational multiplexing techniques (2 or 4)x(2 or 4) downlink and uplink supported Multi-user MIMO TDD/FDD H-ARQ, mobility support, rate control, security, etc. I. Tinnirello Key Features of LTE I. Tinnirello Mobility Intra and Inter Technology I. Tinnirello LTE Standard Specifications Downloadable from 3GPP I. Tinnirello Network and Protocol Architecture I. Tinnirello Protocol Architecture I. Tinnirello LTE Network Architecture E-UTRAN: Evolved Universal Terrestrial Radio Access Network I. Tinnirello LTE Network Architecture eNB: enhanced Node B All radio interface-related functions MME: Management Mobility Entity Manages Mobility, UE identity and security parameters S-GW: Serving Gateway Node that terminates the interface towards E-UTRAN P-GW: Packet Data Network Gateway Node that terminates the interface towards PDN I. Tinnirello Novel Components The overall system architecture was revisited: New Radio-Access Network (RAN) New Core Network (referred as EPC) Evolved Packet The RAN is responsible of: System (EPS) Scheduling and radio-resource handling Retransmission protocols Coding and antenna schemes The EPC is responsible of: Authentication Charging functionality Connections setup I. Tinnirello Core Network The EPC is a radical evolution from the other core network (GSM/GPRS, WCDMA/HSPA) Supports access to the packet- switched domain only (no access to the circuit-switched domain) Contains several nodes: Mobility Management Entity (MME) The Serving Gateway (S-GW) The Packet Data Network Gateway (PDN/P-GW) Other nodes: Policy and Charging Rules Function Home Subscriber Service Multimedia Broadcast Multicast Services All this nodes are logical nodes! I. Tinnirello LTE Network Interfaces I. Tinnirello Nodes’ Functionalities I. Tinnirello Protocol Stacks I. Tinnirello Circuit-Switched Fall Back (CSFB) LTE is a pure PS-switched network! natively supports VoIP using IMS services CSFB mechanism allows to handle voice c

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