A comparative study of wimax and lte

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WiMAX vs LTE

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A comparative study of wimax and lte

  1. 1. A COMPARATIVE STUDY OF WiMAX AND LTE Seminar Presentation By Hanie Salim B080021ecB.Tech Electronics and Communication Engineering ,NIT Calicut
  2. 2. Importance  Mobile device and mobile networks are more popular  More data required  People want to access internet from anywhere  Services like IPTV increase the need for high data rates  As demand increased, current telecommunication networks reach their limits  Solution-next generation networks like WiMAX and LTE2 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  3. 3. An overview of current telecommunication networks3 Hanie Salim (B080021EC),NIT calicutfrom Figure taken www.dailywireless.org 19/09/2011
  4. 4.  Worldwide interoperability for microwave access  IEEE 802.16d standard in 2004 – fixed wireless internet service  Enhanced version IEEE 802.16e in 2006- Mobile wireless access  Managed by WiMAX forum for interoperability of different products  Supports transfer rates up to 46 Mbps in DL and 4 Mbps in UL4 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  5. 5.  Supports scalable system bandwidth using time division duplex(TDD)  So it can use 3.5,5,7,8.75 and 10 MHz as BW  Supports both TDD and FDD, prefers TDD  Maximum coverage is 50 km for fixed usage and 5km for mobile usage  Support vehicular speed up to 120 kmph  2 major releases-WiMAX release 1.0 and release 2.05 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  6. 6. Features of WiMAX release 1.0  Access service network(ASN) & Connectivity service network (CSN) mobility for mobility support  Paging & location management  IPV4 & IPV6 connectivity  Pre provisioned / static QoS  Optional radio resource management(RRM)  Network discovery/selection  Roaming (RADIUS only)  3gpp WLAN compatible internetworking6 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  7. 7. WiMAX release 1.5 features:  Over the Air (OTA) activation & provisioning  Location based services (LBS)  Multicast broadcast services (MBS)  IMS(IP multimedia subsystem) integration  Dynamic QoS and policy and charging (PCC) compatible with 3GPP Release 7  Telephony VoIP with emergency call services and lawful interception  Full NAP sharing support  Diameter-based authentication, authorization and accounting (AAA)7 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  8. 8. QoS for WiMAX:  Reservation based access  Use frames, each frame -2 sub frames  Duration 2 to 20 ms  Flexible ratio for DL/UL WiMAX frame Hanie Salim (B080021EC),NIT calicut Figure source: www.ecee.colarado.edu8 19/09/2011
  9. 9.  Use OFDMA in DL & UL  OFDMA- multi-user ver. Of OFDM  Advantages of OFDMA –high spectral efficiency, efficient implementation using FFT & low sensitivity to time synchronization errors  scalable by flexibly adjusting FFT sizes & channel BW with fixed symbol duration and subcarrier spacing  Sensitive to frequency sensitive errors9 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  10. 10.  3 power saving classes- different on-off time • Class 1 - window increase exponentially from minimum value to maximum • Class 2 - fixed sleep window length • Class 3 – MS know when to expect next packet  Security sub layer present under MAC layer  Extensible Authentication Protocol (EAP)  Privacy and Key Management protocol (PKM)  Encapsulation protocol10 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  11. 11.  Use MIMO technology to increase transfer rate  2 categories: • Open loop MIMO- the transmitters do not need explicit knowledge of the channels • Closed loop MIMO- transmitter forms antenna beams adaptively based on the channel side information (Tx AA)  Logical entities of NRM • Access service network(ASN) • Connectivity service network (CSN)11 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  12. 12. Network reference model for WiMAX Figure source: www.eetimes.com12 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  13. 13.  Long term evolution-developed by 3GPP in 2008  LTE standard is officially known as “document 3GPP Release 8” Or 3.9G  Supports peak data rates of 100 Mbps in DL & 50 Mbps in UL, using 20 MHz spectrum  With MIMO it can reach up to 300Mbps  Variable spectrum 1.25, 2.5, 5, 10, 15 and 20 MHz  A cell radius 100 km with slight degradation after 30 km and reach over 200 users per cell (with 5 MHz spectrum)13 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  14. 14.  Optimized for low speeds 0 - 15 km/h , supports speeds up to 350 km/h.  RTT below 10 ms possible.  Use OFDMA in DL & SCFDMA in UL  OFDMA - power inefficient, because of high peak-to- average-power ratio (PAPR)  Since DL start from BS no problem, But UL start from MS ,hence SCFDMA (low PAPR)14 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  15. 15. Architecture:  Two-node architecture - only two nodes are involved between user equipment & core network.  The base station (eNodeB) & the serving gateway (S- GW) in the user plane and the mobility management entity (MME) in the control plane.  LTE architecture is composed of Core Network (CN) and Access Network (AN), where CN corresponds to the Evolved Packet Core (EPC) and AN refers to E- UTRAN.  The CN and AN together correspond to Evolved Packet System (EPS)15 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  16. 16. LTE overall architecture Figure source: www.wiki.hsc.com16 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  17. 17.  EPS connects user to Packet data network(PDN)  Functions of MME- CN node signalling for mobility between 3GPP access networks, S-GW selection, roaming, authentication, bearer management functions and NAS (Non Access Stratum) signalling  S-GW terminates the interface towards E-UTRAN.  For each user in EPS, at given time, a single S-GW is responsible for transferring user IP packets, lawful interception & mobility anchor for inter eNodeB handover and for inter-3GPP mobility.17 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  18. 18.  Power-saving mechanisms: turn off the transmitter when idle. • It uses Discontinued Reception (DRX) & Discontinued Transmission (DTX).  Security mechanisms : similar to WiMAX • use security keys between transmitter &receiver to ensure a secure connection . • LTE also offers a key derivation protocol, which resets the connection if corrupt keys are detected.18 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  19. 19. QoS:  Reservation based access  Each frame is 10 ms long  The 0th and the 5th sub frames are always reserved for DL  Other frames can be DL, UL or a switch point  This switch point method makes the transmission more dynamic in allocating resources Figure source: IT pro 201019 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  20. 20. 4 x 4 MIMO configuration Figure source: IT pro 201020 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  21. 21. Comparison  Released in 2005  Released in 2009  46 Mbps in DL and up to  300 Mbps in Dl and 75 4 Mbps in UL Mbps in the UL  Support BW 3.5 MHz to  Support bigger range of 10 MHz BW 1.4 MHz to 20 MHz  Range up to 50 km,  Bigger range up to 100 km, optimized for 1.5 to 5 km optimized for 30 km  Support speed up to 120  Support speed up to 350 km/h km/h21 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  22. 22. Comparison  Use OFDMA in both DL  Use SCFDMA in UL and and UL OFDMA in DL  Frame is separated into DL  From 10 sub-frames only 2 and UL sub-frame allocate are reserved for DL, more resources to different users dynamic, so they reach  Duplex mode only TDD is smaller delays. commercially available  Both FDD & TDD  Backward compatibility to  Inter radio technology 3G/2G not present handover possible22 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  23. 23. 4G Requirements  Both WiMAX & LTE do not meet all 4G requirements  4G specifications, also known as IMT-Advanced:  Max. data rates up to 100 Mbps for mobile access  Max. data rates up to 1 Gbps for fixed access  Flat all-IP architecture  High mobility up to 500 km/h.  scalable channel bandwidth  Solution : LTE’s successor, LTE-Advanced and WiMAX’ next release WiMAX 2.0.23 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  24. 24.  Long term evolution advanced, officially known as 3GPP Release 10  Recognized as IMT A in October 2010  Commercial availability expected from 2014  Peak data rate of 1 Gbps in DL (low mobility) & up to 500Mbps in UL  BW extended up to 100 MHz using channel aggregation  MIMO to be used in UL also  Support 8x8 MIMO24 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  25. 25. WiMAX 2.0  WiMAX release 2.0 recognized as IMT in October 2010  IEEE 802.16m standardized in April 2011  Backward compatibility with all 802.16 standards  DL rate >300 Mbps, 4x4 @ 20MHZ  UL rate >135 Mbps, 2x4 @ 20MHz  Support channel BW of 5,10,20,40 MHz  Mobility up to 350 km/h25 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  26. 26. Technical comparison of LTE and WiMAX26 Figure Hanie Salim (B080021EC),NIT calicut source: www.kuncoro.co.uk 19/09/2011
  27. 27. References  [1] M.Chang, Z. Abichar, and Chau –Yun Hsu, “Wimax vs. lte: Who will lead the broadband mobile internet?,” IT Professional, vol. 12, no. 3, pp. 26 - 32, 2010.  [2] Ozgur Oyman , Jeffrey Foerster ,Yong-joo Tcha and Seong- Choon Lee , “Toward Enhanced Mobile Video Services over WiMAX and LTE,” IEEE Communications Magazine ,vol. 48,no.8,pp. 68 – 76,2010  [3] J. Conti, “Lte vs wimax: the battle continues,” Engineering Technology, 2010.  [4] Leo Yi ,Kai Miao ,Adrian Liu,” A comparative study of WiMAX and LTE as the next generation mobile enterprise network,” Advanced Communication Technology(ICACT),pp. 654-658,feb 2011.27 Hanie Salim (B080021EC),NIT calicut 19/09/2011

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