lte - agenda lte basic lte road map lte architecture lte access network lte channel

Download LTE - Agenda LTE Basic LTE Road Map LTE Architecture LTE Access Network LTE Channel

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  • LTE - Agenda LTE Basic LTE Road Map LTE Architecture LTE Access Network LTE Channel
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  • Aim of Long Term Evolution Increased Capacity Reduce Network Complexity Lower deployment and operating cost
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  • What is LTE ? 3GPP Long Term Evolution, referred to as LTE and marketed as 4G LTE, is a standard for wireless communication of high-speed data for mobile phones and data terminals. It is based on the GSM/EDGE and UMTS/HSPA network technologies, increasing the capacity and speed using new modulation techniques. In Nov. 2004, 3GPP began a project to define the long-term evolution (LTE) of Universal Mobile Telecommunications System (UMTS) cellular technology Higher performance Backwards compatible Wide application 5
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  • LTE Key factors LTE High Data Rates > 100 Mbps Downlink > 50 Mbps Uplink Channel Setup < 100 ms Why ? Mobile Broadband Tendency Customers need for more Spectral Efficience platform for Mobile data communicattion. ( Cost of Bits / Hz) Efficient Reducing OPEX & CAPEX Easy to deploy (self configuring/optimizing) TDD / FDD & Spectrum Flexibility New Services (IPTV & Games in Real Time) High Performance for Broadcast Services Wide Range of Terminals Increase Service Provisioning
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  • Evolution of Radio Access Technologies LTE (3.9G) : 3GPP release 8~9 LTE-Advanced : 3GPP release 10+ 7 802.16d/e 802.16m
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  • Towards LTE
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  • 3G- R99 HSPA HSPA Evolution LTE 200220052008/20092009 384 kbps3.6 Mbps21/28/42 Mbps~150 MbpsPeak rate 2007 7/14 Mbps Mobile broadband speed evolution LTE Evolution 2013 1 Gbps Target OtherCDMAMobile WiMAXGSM/GPRS/EDGEWCDMAHSPALTE 2006 2007200820092010201120122013 0 1 000 2 000 3 000 4 000 5 000 6 000 7 000 Reported Subscriptions (million)
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  • LTE Terminals Examples of Terminals that to be available for LTE
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  • LTE Evolution
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  • LTE Smooth Migration
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  • LTE Architecture GbIu GERANUTRAN 3G 2G LTE RAN LTE Non-3GPP MME/ UPE SGi IP networks S3 S4 S5a S6 S7 S1 S2 EVOLVED PACKET CORE MME = Mobility Management Entity IASA = Inter-Access System Anchor PCRF HSS SGSN 3GPP Anchor SAE Anchor S5b IASA
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  • LTE (Long Term Evolution) Radio Side (LTE Long Term Evolution) Improvements in spectral efficiency, user throughput, latency Simplification of the radio network Efficient support of packet based services Network Side (SAE System Architecture Evolution) Improvement in latency, capacity, throughput Simplification of the core network Optimization for IP traffic and services Simplified support and handover to non-3GPP access technologies
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  • Evolution Path Architecture The pay load is to be directed to a tunnel (eUTRAN) Payload goes directly from the evolved node B to the Gateway Control plane is directed at the Mobility management end. LTE
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  • WCDMA (HSPA) x LTE Access Network WCDMA System Architeture LTE System Architeture RAN
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  • eUTRAN (LTE) interfaces Logical view MME/GW S1-C X2 eNode B Evolved Packet Core Evolved UTRAN
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  • LTE eNodeB LTE eNodeB Coding, Interleaving, modulation & typical layer functions. ARQ, Header Compression & layer functions Security Functions (Ciphering / Integrity Protection ) eNodeB take decisions about Handover & scheduling for uplink and downlink. Radio Resources Control functions Connected to the Core Network with S1 Interface (similar as Iu) X2 is similar to Iur Interface, mainly used to support the Active Mode Mobility.
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  • WCDMA (HSPA) x LTE Core WCDMA System Architeture LTE - SAE System Architeture Evolution
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  • WCDMA LTE - Core LTE Core Introduction of EPC Evolved Packet Core SAE just covers Packet Switched Domain HSS is the same as HLR in GSM/WCDMA network HSS uses the S6 interface eNodeB is connected to the EPC by S1 Interface EPC acts as anchor in the SAE Core Network for mobility Charging Management of Subscriber Mobility Management ( roaming ) QOS Handling Policy Control of Data Flows Interconection with External Networks
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  • SAE: System Architecture Evolution HSS HLR AAA PDN GW Serv GW MME SGSN PCRF LTE 2G 3G Non-3GPP Non-trusted Non-3GPP Trusted Eg cdma Wx* Gb Iu-C S3 S4 S1-C S1-U S12 S10 S11 S5/S8 SGi S6c S7 S7c S7b S7a Ta* S2a Wa* Wn* Wm* IP networks S9 S6a Gr S101/102 ePDG S2b Wn* S2c S103 WSM module Mobility Management Entity (MME): The MME manages mobility, UE identities and security parameters The Serving Gateway is the node that terminates the interface towards LTE RAN PDN Gateway (PDN GW): The PDN Gateway is the node that terminates the SGi interface towards the PDN
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  • MME Functionality Roaming (S6a towards home HSS) Authentication SAE GW selection Idle mode mobility handling Tracking Area Update Paging Mobility handling of inter-MME (pool) handover (triggered by eNodeB) inter-RAT handover (triggered by eNodeB) QoS negotiation with UE and eNodeB Security Ciphering and integrity protection of NAS signalling Secure control signalling transport on S1 interface (unless taken care of by a SEG (Security Gateway)) O&M security (?) SAE CN Architecture SGi MME S1-MME S1-U S11 X2 S10 eNodeB S3 S4 SGSN SAE GW
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  • SAE GW Functionality PDN SAE GW: Policy Enforcement Per-user based packet filtering (by e.g. deep packet inspection) Charging Support User plane anchor point for mobility between 3GPP accesses and non-3GPP accesses routing of user data towards the S-GW Security O&M security (?) Lawful Intercept Serving SAE GW: User plane anchor point for inter-eNB handover (within one pool) User plane anchor point for inter-3GPP mobility routing of user data towards the eNodeB routing of user data towards the P-GW routing of user data towards the SGSN (2G and 3G) or RNC (3G with Direct Tunnel) Security Secure user data transport on S1 interface (unless taken care of by a SEG (Security Gateway)) O&M security (?) Lawful Intercept The PDN SAE GW and the Serving SAE GW may be implemented in one physical node or separated physical nodes. SAE CN Architecture SGi MME S1-MME S1-U S11 X2 S10 eNodeB S3 S4 SGSN SAE GW
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  • Key LTE radio access features LTE radio access Downlink: OFDM Uplink: SC-FDMA Advanced antenna solutions Diversity Beam-forming Multi-layer transmission (MIMO) Spectrum flexibility Flexible bandwidth New and existing bands Duplex flexibility: FDD and TDD 20 MHz1.4 MHz TX SC-FDMA OFDMA
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  • LTE Access Network LTE employs OFDMA in DL and SC-FDMA in UL LTE basic charactheristics: Flexibility bandwidth (from 1.4 Mhz to 20 MHZ). Orthogonally in uplink and downlink. Modulation : QPSK, 16QAM, 64QAM. FDD (frequency division duplex), HD FDD ( half frequency division duplex & TDD (time Division Duplex are supported). Advanced Antenna Technology MIMO is used in downlink to allow high peak rates.
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  • UL-SCH Channel Structure Downlink and Uplink PCH DL-SCH PCCH Logical Channels type of information (traffic/control) Transport Channels how and with what characteristics (common/shared/mc/bc) Downlink Uplink PDSCH Physical Channels bits, symbols, modulation, radio frames etc MTCH MCCH BCCH DTCH DCCH DTCH DCCH CCCH PRACH RACH CCCH MC H BCH PUSCHPBCHPCFICHPUCCH ACK/NACK CQI Scheduling req. -Sched TF DL -Sched grant UL -Pwr Ctrl cmd -HARQ info pri sec PMCHPHICHPDCCH ACK/NACK PDCCH info
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  • LTE Logical Channels ( type of Information) BCCH ( Broadcast Control Channel ) Used for transmission of system control information to all mobiles in the cell. Prior to access the network the mobile needs to read the information on BCCH to find out how the system is configured, for example the bandwidth. PCCH ( Paging Control Channel ) used for Paging of Mobiles whose location on cell level in not know to the network. DCCH ( Dedicated Control Channel ) Used for Transmission of control information to/from mobile. This channel is used for individual configuration of Terminals such as differents kinds of handover messages.
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  • LTE Logical Channels ( type of Information) MCCH ( Multicast Control Channel ) used for transmission of control information required for reception of the MTCH. DTCH ( Dedicated Traffic Channel ) used for transmission of user data to/from a mobile terminal. This is the logical channel type used for transmission of all uplink and non-MBMS downlink user data. MTCH ( Multicast Traffic Channel ) used for downlink transmission of MBMS services.
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  • LTE Transport Channels BCH ( Broadcast Channel ) Fixed Tranport Format Used for identification of cells & transmission of BCCH logical channel. RACH ( Random Access Channel ) Used for Access the Network from theTerminal. Limited control information and colission risk. PCH ( Paging Channel ) is used for transmission of paging information on the PCCH logical channel. The PCH supports discontinuous reception (DRX) to allow the mobile terminal to save battery power by sleeping and waking up to rec


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