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3GPP       Network Architecture            Radio Access Technologies   Discussion       UMTS vs. LTE: a comparison overvie...
3GPP                Network Architecture        Radio Access Technologies   Discussion                                    ...
3GPP                 Network Architecture            Radio Access Technologies   Discussion                               ...
3GPP                Network Architecture            Radio Access Technologies   Discussion                                ...
3GPP                Network Architecture        Radio Access Technologies   Discussion                                    ...
3GPP                Network Architecture             Radio Access Technologies            Discussion                      ...
3GPP              Network Architecture       Radio Access Technologies       Discussion             Services for telecommu...
3GPP            Network Architecture      Radio Access Technologies   Discussion                                 UMTS obje...
3GPP               Network Architecture           Radio Access Technologies         Discussion                            ...
3GPP               Network Architecture       Radio Access Technologies   Discussion                                      ...
3GPP                         Network Architecture              Radio Access Technologies     Discussion                   ...
3GPP                  Network Architecture          Radio Access Technologies   Discussion                           UMTS ...
3GPP                Network Architecture       Radio Access Technologies    Discussion                                    ...
3GPP                Network Architecture        Radio Access Technologies   Discussion                                    ...
3GPP            Network Architecture         Radio Access Technologies   Discussion                                CDMA: P...
3GPP           Network Architecture     Radio Access Technologies     Discussion                          WCDMA in UMTS [4...
3GPP               Network Architecture    Radio Access Technologies   Discussion                           LTE’s downlink...
3GPP                Network Architecture            Radio Access Technologies       Discussion                  LTE’s upli...
3GPP          Network Architecture          Radio Access Technologies   Discussion                                     Ref...
3GPP                Network Architecture         Radio Access Technologies     Discussion                                 ...
3GPP               Network Architecture          Radio Access Technologies   Discussion                                   ...
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3g4g ktv2011

  1. 1. 3GPP Network Architecture Radio Access Technologies Discussion UMTS vs. LTE: a comparison overview Unik4230: Mobile Communications Khai Vuong May 16, 2011
  2. 2. 3GPP Network Architecture Radio Access Technologies Discussion Agenda 3GPP Network Architecture UMTS LTE Radio Access Technologies WCDMA OFDMA Discussion
  3. 3. 3GPP Network Architecture Radio Access Technologies Discussion 1 3GPP Standards (I) 3GPP: 3rd Generation Partnership Project Version Released Info Release 98 1998 specified pre-3G GSM network Release 99 2000 Q1 specified the first version of UMTS, in- corporating a CDMA air interface Release 4 2001 Q2 aka. Release 2000, added all-IP Core Network Release 5 2002 Q1 introduced IMS and HSDPA Release 6 2004 Q4 integrated operation with Wireless LAN networks and added HSUPA, MBMS, enhancements to IMS 1 http://en.wikipedia.org/wiki/3GPP
  4. 4. 3GPP Network Architecture Radio Access Technologies Discussion 2 3GPP Standards (II) Version Released Info Release 7 2007 Q4 decreasing latency, improvements to QoS and real-time applications, HSPA+ , NFC, EDGE Evolution. Release 8 2008 Q4 First LTE release. All-IP Network (SAE), new OFDMA, FDE and MIMO based radio interface. Release 9 2009 Q4 SAES Enhancements, Wimax and LTE/UMTS Interoperability Release 10 2011 Q1 LTE advanced 2 http://en.wikipedia.org/wiki/3GPP
  5. 5. 3GPP Network Architecture Radio Access Technologies Discussion 3 3GPP data evolution 3 Huawei Technologies Co., Ltd. 2009
  6. 6. 3GPP Network Architecture Radio Access Technologies Discussion User experience Type of services UMTS LTE Web surfing 8 seconds immediately Download 5MB music 3 minutes 1 second Download 750MB movie 6.5 hours 2.5 minutes Download HD video ∼2-3 days ∼15 minutes √ √ Video telephony √ √ Corporate VPN, Intranet √ √ Mobile TV √ On-demand TV √ Video-based mobile advertising √ ... Table: Data services4 4 Huawei Technologies Co., Ltd. 2009
  7. 7. 3GPP Network Architecture Radio Access Technologies Discussion Services for telecommunication systems 1. Teleservice: Information that transfered between end users, e.g speech service, messaging, emergency calls. 2. Bearer service: Different QoS classes for various type of traffic: • Conversasional: voice, video, telephony, video gaming • Streaming: multimedia, video on-demand, webcast • Interactive: web browsing, network gaming, database access • Background: email, SMS, downloading
  8. 8. 3GPP Network Architecture Radio Access Technologies Discussion UMTS objectives 1. improvement in data performance, multimedia services and access to the Internet 2. new radio interface WCDMA 3. Core Network: connection function
  9. 9. 3GPP Network Architecture Radio Access Technologies Discussion Core Network for UMTS • MSC:Mobile switching center, switch the CS transactions • GMSC: Gateway MSC: a switch that connects the UMTS PLMN to the external CS networks. • SGSN: Serving GPRS Support Node, similar to MSC/VLR but this is for PS traffic. • GGSN: Gateway GPRS Support Node, similar to GMSC but it serves for the PS traffic.
  10. 10. 3GPP Network Architecture Radio Access Technologies Discussion 5 LTE’s objectives 1. higher data rates in both downlink and uplink transmission 2. reduce packet latency, more responsive user experience 3. flat architecture: IP-based, open interfaces, simplified network 4. flexible radio planning and high spectral efficiency 5. reduce delivery costs for rich communications 6. long-term revenue stability and growth 7. coexistence alongside circuit switched networks 5 UMTS Forum 2008
  11. 11. 3GPP Network Architecture Radio Access Technologies Discussion Why LTE?6 GSM EDGE WCDMA HSPA LTE Non-3GPP technologies Figure: Flexible upgrade path Figure: Reduce pris per MB to remain profitable 6 Nokia Siemens Networks
  12. 12. 3GPP Network Architecture Radio Access Technologies Discussion UMTS vs. LTE Architecture 7 Figure: Network architecture, simplified LTE: simplified IP flat architecture • BSC/RNC disappeared, functions transfer to eNodeB • All eNodeB connect directly through X2 interface • PS service only, voice over IP. 7 Image courtesy: UMTS Forum 2008
  13. 13. 3GPP Network Architecture Radio Access Technologies Discussion 8 LTE’s interfaces: S1 and X2 • X2: connects eNodeB • MME (Mobility Management Entity): distribution of paging message to eNodeB • UPE (User Plan Entity): IP header compression, encryption of user data stream, termimating and • S1: self-optimizing network switching of U-plane 8 Image courtesy: developer.att.com
  14. 14. 3GPP Network Architecture Radio Access Technologies Discussion Wideband CDMA 9 Figure: Access technique for UMTS 9 Huawei Technologies Co., Ltd. 2009
  15. 15. 3GPP Network Architecture Radio Access Technologies Discussion CDMA: Principles • each user is assigned a spreading code for encoding it’s data • Receiver knows the code of user, it can decode the received signal, recover the original data • Bandwidth of coded data signal much larger than original data signal due to the encoding process spreads the spectrum of the origianl signal, based on spread-spectrum modulation
  16. 16. 3GPP Network Architecture Radio Access Technologies Discussion WCDMA in UMTS [4] • Direct Sequence CDMA system, with chip-rate 3.84 Mc/s • Combined with FDMA: every carrier is allocated 5 MHz frequency band so that many operators can provide services without interference each other. • Codes: scrambling and channelization Channelization: seperates Scrambling codes: not traffic to and from different increase bandwidth, but is users, called Orthogonal used for distinguishing Variable Spreading Factor terminals in uplink and (OVSF) which varies from 1 sectors (cells) in downlink to 128
  17. 17. 3GPP Network Architecture Radio Access Technologies Discussion LTE’s downlink: OFDMA OFDM: Multiple access scheme, allows simultaneous connections to/from multiple mobile terminals Users share different subcarriers, either consecutive or distributed manner.
  18. 18. 3GPP Network Architecture Radio Access Technologies Discussion LTE’s uplink: Single Carrier-FDMA • SC-FDMA: hybrid modulation scheme that combines the low PAPR techniques of single-carrier transmission systems, such as GSM and CDMA, with the multi-path resistance and flexible frequency allocation of OFDMA • Data symbols in the time domain are converted to the frequency domain using a discrete Fourier transform (DFT) • Cyclic Prefix (CP) is added, a serial Figure: Structure for UL and DL in sequence of symbols is modulated LTE [5] and transmitted instead of parallel OFDM-scheme • On receiver’s side, an extra N-point An advantage of SC-FDMA compares to IDFT is applied to reconstruct the OFDMA is low Peak to Power Average original symbols. Ratio (PAPR), that helps increasing battery life.
  19. 19. 3GPP Network Architecture Radio Access Technologies Discussion References Ville Eerola, LTE Network Architecture Evolution, Lecture note in T-109.5410 Technology Management in the Telecommunications Industry, Helsinski University of Technology, 2010. UMTS Forum, Toward Global Mobile Broadband, retreived May 16, 2011from www.umts-forum.org/component/option,com.../Itemid,12/ M. Neruda and R. Bestak, Evolution of 3GPP Core Network, IWSSIP 2008. Lecture notes in UniK 4230, UiO, Lecture9-10.pdf OFDM(A) for wireless communications, Telenor R&I R 7/2008
  20. 20. 3GPP Network Architecture Radio Access Technologies Discussion 10 A brief comparision Requirements UMTS LTE Spectral Efficiency 0.2bit/s/Hz 1.57bit/s/Hz Peak Data Rate 2 Mbit/s 170 Mbit/s Sector Capacity 1 Mbit/s 31.4 Mbit/s No. of Tranceivers/Cell 30 1 RTT User Plane 50 ms 5 ms Call setup time 2s 50 ms Mobility 250 km/h 350 km/h Bandwidth 5 MHz scalable up to 20 MHz 10 UMTS/HSPA to LTE Migration, Motorola Inc. 2009
  21. 21. 3GPP Network Architecture Radio Access Technologies Discussion Discussion Point to discuss, focus on this topic, futher questions?

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