• Like
A comparative study of wimax and lte
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

A comparative study of wimax and lte

  • 1,175 views
Published

WiMAX vs LTE

WiMAX vs LTE

Published in Technology , Business
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
1,175
On SlideShare
0
From Embeds
0
Number of Embeds
0

Actions

Shares
Downloads
147
Comments
0
Likes
0

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. A COMPARATIVE STUDY OF WiMAX AND LTE Seminar Presentation By Hanie Salim B080021ecB.Tech Electronics and Communication Engineering ,NIT Calicut
  • 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. An overview of current telecommunication networks3 Hanie Salim (B080021EC),NIT calicutfrom Figure taken www.dailywireless.org 19/09/2011
  • 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.  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. 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. 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. 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.  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.  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.  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. Network reference model for WiMAX Figure source: www.eetimes.com12 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  • 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.  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. 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. LTE overall architecture Figure source: www.wiki.hsc.com16 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  • 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.  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. 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. 4 x 4 MIMO configuration Figure source: IT pro 201020 Hanie Salim (B080021EC),NIT calicut 19/09/2011
  • 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. 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. 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.  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. 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. Technical comparison of LTE and WiMAX26 Figure Hanie Salim (B080021EC),NIT calicut source: www.kuncoro.co.uk 19/09/2011
  • 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