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4 g wireless   ace- 4-5-2010
 

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    4 g wireless   ace- 4-5-2010 4 g wireless ace- 4-5-2010 Presentation Transcript

    • 4G WirelessTechnology Airspan Technical Symposium May 3, 2010 By Donn Swedenburg and Mark T. Pflum RVW, Inc. (402)564-2876 1
    • 4G Wireless TOPICS • 4G Wireless Definition • Technologies used in 4G • Pre-4G • Real World Implications ©2009 RVW, Inc. 2
    • 4G Wireless: Definition• 4G Wireless: – Defined by the ITU (International Telecommunication Union). – A 4G system targets peak data rates of approximately 100 Mbps for high mobility service. – A 4G system targets peak data rates of approximately 1 Gbps for low mobility/ fixed service. – Shall support required channel bandwidths from 5 to 20 MHz with an optional 40 MHz channel allowed. ©2009 RVW, Inc. 3
    • 4G Wireless: Definition – Shall support both TDD and FDD duplexing technologies with UL/DL configurable ratios for both. – Network architecture will be all IP based. – Must utilize MIMO technology. – Latency: • Data - 10 ms. In both UL & DL • Idle state to active state – 100 ms. • Site handoff – 50 ms. Intrafrequency, 150 ms. Interfrequency. ©2009 RVW, Inc. 4
    • 4G Wireless: Technologies used in 4G• MIMO - Minimum antenna configurations. – For the BS - a minimum of 2 Tx and 2 Rcv antennas – For the MS - a minimum of 1 Tx and 2 Rcv antennas• MIMO Techniques - – Beam forming – makes use of multiple antennas to steer or focus signal in a particular direction. Can reduce adjacent site self-interference & add reach. – SU-MIMO (Single User MIMO) • Transmitting parallel & unique data streams in the same frequency-time resource to a single user. (Spatial Multiplexing) • Improves individual users throughput. ©2009 RVW, Inc. 5
    • 4G Wireless: Technologies used in 4G• MIMO Techniques - continued – MU-MIMO (Multiple User MIMO) • Transmitting parallel & unique data streams in the same frequency-time to multiple users. (Spatial multiplexing) • Improves sector/site capacity throughput. – STBC - Space Time Block Coding • The simplest of the STBCs transmits multiple copies of a single data stream across a number of antennas which improves the SNR of the received data to improve the reliability of data-transfer. ©2009 RVW, Inc.
    • 4G Wireless: Technologies used in 4G • OFDMA – Orthogonal Frequency Division Multiple Access. (LTE DL only, WiMAX UL and DL). • Two types of sub-carrier permutations. – Contiguous subcarriers grouped into logical sub-channels (Used in LTE & WiMAX sub channels). – Pseudo-random subcarriers grouped into logical sub channels (Used in WiMAX FUSC and PUSC). ©2009 RVW, Inc. 7
    • 4G Wireless: Technologies used in 4G • SC-FDMA – Single Carrier Frequency Division Multiple Access. (LTE UL only) – Low peak-to-average power ratio conserves mobile battery life. ©2009 RVW, Inc. 8
    • 4G Wireless: Technologies used in 4G • ACM – Adaptive Coding and Modulation – Changing the coding (1/2, 2/3, 3/4) and modulation schemes (BPSK, QPSK, 16 QAM, 64QAM) based upon current RF conditions. • HARQ - Hybrid automatic repeat request – The most common version uses transmissions with incrementally more redundant error- detecting codes such as cyclical redundancy checking (CRC) and forward error correction bits (FEC). ©2009 RVW, Inc. 9
    • 4 G Wireless: Pre 4G – LTE• LTE capable of 100 Mbps in DL and 50 Mbps in UL. – This would be for a single user, single site/sector with 20 MHz bandwidth for both uplink and downlink under extremely favorable RF conditions with adequate backhaul capacity.• Key Features of LTE – Multiple access scheme – DL is OFDMA, UL is SC-FDMA. – Adaptive modulation. coding, H-ARQ and error correction. – Advanced MIMO (2 X 2, 4 X 4) spatial, single or multi-user multiplexing techniques – Support for both FDD and TDD ©2009 RVW, Inc. 10
    • 4 G Wireless: Pre 4G – LTE• Initial LTE deployment by Verizon will not technically meet the 4G requirement as stated by the ITU Reference: http://business.motorola.com/experiencelte/lte-depth.html ©2009 RVW, Inc. 11
    • 4G Wireless: Pre 4G - WiMAX• 802.16-2004 (d) is often called Fixed WiMAX – Fixed WiMAX does not support Mobility. – Does not support 1 cell frequency reuse. – Utilizes OFDM-256 FFT (Orthogonal Frequency-Division Multiple) – Also supports OFDMA 2048, but only OFDM 256 FFT is specified in WiMAX 802.16d profiles. – Supports both TDD (Time Division Duplexing) and FDD (Frequency Division Duplexing) services ©2009 RVW, Inc. 12
    • 4G Wireless: Pre 4G – WiMAX “d”• 802.16-2004 – Fixed WiMAX – Fixed WiMAX throughputs for OFDM-256 (Unknown SNR) ©2009 RVW, Inc. 13
    • 4G Wireless: Pre 4G – WiMAX “e”• 802.16-2005 – Mobile WiMAX – Not backwards compatible with Fixed WiMAX – Offers the capability of 1 cell frequency reuse. – Supports TDD, FDD, and Half-Duplex FDD operation – However the initial release of Mobile WiMAX certification profiles will only include TDD. – Sprint/Clearwire are referring to 802.16 “d” and “e” as 4G which is not technically correct. http://www.nextel.com/en/solutions/mobile_broadband/mobile_broadband_4G.shtml ©2009 RVW, Inc. 14
    • 4G Wireless: Pre 4G – WiMAX “e”• 802.16-2005 – Theoretical Throughputs The highlighted values indicate data rates for optional 64QAM in the UL. Reference: “Mobile WiMAX – Part I: A Technical Overview and Performance Evaluation” WiMAX Forum ©2009 RVW, Inc. 15
    • 4G Wireless: Implications• So, where are we on the 4G Timeline? – February, 2007 - NTT tests a 4G lab prototype. Achieves 100 Mbps mobile & 1 Gbps fixed with 4 X 4 MIMO. Achieves 5 Gbps DL with a 100 MHz channel and a 12 X 12 MIMO. – May, 2007 – IEEE proposes 802.16m, upgrade to the 802.16e standard. – April, 2008 – LG/Nortel demonstrates the e- UTRA LTE SDR at 50 Mbps mobile at 68 MPH. – December, 2009 – First commercial LTE deployment in Stockholm, Sweden. Single user tests show 42.8 Mbps down, 5.3 Mbps up. ©2009 RVW, Inc.
    • 4G Wireless: Implications• While 4G will undoubtedly be a future force, be aware that - – Real 4G does not exist today – Real 4G will require access to huge amounts of last-mile spectrum that is not available today. – Equipment R&D still in progress. – Backhaul networks already under stress from “3G” networks will need continuing capacity upgrades • High capacity ethernet connections over fiber optic networks will probably be the needed at all sites in the near future. ©2009 RVW, Inc. 17
    • Succeeding With Teamwork! ©2009 RVW, Inc. 18