wimax vs hsdpa
DESCRIPTION
3GTRANSCRIPT
DATE OF ISSUE 20/05/2007
TITLE 3G HSDPA & WIMAX
COMPARISON
CONTROL NO. NO. OF PAGES Page 1 of 15
SYRIATEL RESTRICTED:
TECHNICAL
Dimensioning Study
WiMax Vs.HSDPA
3G Team – Technical Department - Eng.Ala’aeddin Alazmeh
APPROVED BY DEPARTMENT TECHNICAL
FUNCTION 3G project manager
Technical director
NAME EMAD SAKA AMINI AYMAN ZWIYA
SIGNATURE
DATE
THE INFORMATION CONTAINED HEREIN IS PROPRIETARY TO SYRIATEL, AND IT SHALL NOT BE USED, REPRODUCED OR DISCLOSED TO OTHERS EXCEPT AS SPECIFICALLY PERMITTED IN WRITING BY THE PROPRIETOR. THE RECIPIENT OF THIS INFORMATION, BY ITS RETENTION AND USE, AGREES TO PROTECT THE SAME FROM LOSS, THEFT OR UNAUTHORIZED USE.
REVISION HISTORY
REVISION DATE STATUS DESCRIPTION DRAFT 1
15/04/2007
00
20/04/2007
01
02/05/2007
02
20/05/2007
Is Modified after recommendations of Eng.Emad Saka Ameni
20/05/2007 DATE OF ADOPTION
TITLE 3G HSDPA & WIMAX
COMPARISON
DATE OF ISSUE 20/05/2007
CONTROL NO. NO. OF PAGES Page 2 of 15
TECHNICAL DEPARTMENT – 3G Team, WIMAX & 3G COMPARISION
1.1 Purpose: Make a simple comparison between 3G HSDPA and WiMax, can WiMax challenge 3G?
1.2 Scope : High level information about site count for a given area.
1.3 Report:
Wimax vs. HSDPA
DATE OF ISSUE 20/05/2007
TITLE 3G HSDPA & WIMAX
COMPARISON
CONTROL NO. NO. OF PAGES Page 3 of 15
TECHNICAL DEPARTMENT – 3G Team, WIMAX & 3G COMPARISION
Wimax, 3G and HSPA Comparison
Executive Summary:
• In the following study we have made a comparison between Wimax and UMTS HSPA in 10 km² area and find that; we need 2 UMTS(HSDPA) sites to cover 10 Km² , on the other hand we need 3.7 Wimax sites to cover the same area.
• Please note that this study doesn’t take into account indoor loss, terrain, and interference.
• More WiMax sites are needed to cover the same area.
• As per Deutsche bank, it costs 35% more to provide coverage using WiMax technology Vs.HSDPA.
• 3G HSDPA offers ubiquitous access to toll-quality voice & broadband data services within a wide area using existing infrastructure.
UMTS WiMax No. Of Sites 2 3.7
• WiMax still under deployment but it is promising technology that offers high speed data rate with cost efficient core.
• To do deeper analysis for this technology, we recommend that we do a small trial WiMax network and test its performance and see if we can use it in Hot Spots and special applications.
TITLE 3G HSDPA & WIMAX
COMPARISON
DATE OF ISSUE 20/05/2007
CONTROL NO. NO. OF PAGES Page 4 of 15
TECHNICAL DEPARTMENT – 3G Team, WIMAX & 3G COMPARISION
• We approached writing using the following steps:
1. Preparation: • Primary Purpose (Wimax & HSDPA comparison) • Assess readers (Technical director – 3G Manager) • Study scope coverage (High level information about
Wimax & HSDPA) • Determinate the medium ( PDF text file).
2. Research: • Primary research (Technical references) • Secondary research (Web documents, e-mail discussions, operating manuals and PPT files).
3. organization 4. writing 5. Revision
DATE OF ISSUE 20/05/2007
TITLE 3G HSDPA & WIMAX
COMPARISON
CONTROL NO. NO. OF PAGES Page 5 of 15
TECHNICAL DEPARTMENT – 3G Team, WIMAX & 3G COMPARISION
Introduction:
WiMAX has gained significant momentum over the last year. Its standardization is complete, vendor and operator ecosystems are expanding, and the hype is getting louder, often justifiably so. In this report, we move beyond the hype and theoretical discussion; we look at real-world examples of pre-WiMAX deployments and review practical issues such as time-to-market, business models and pricing, device availability, economics of scale and spectrum availability, with an emphasis on a number of key questions, most notably, can WiMAX challenge 3G?
DATE OF ISSUE 20/05/2007
TITLE 3G HSDPA & WIMAX
COMPARISON
CONTROL NO. NO. OF PAGES Page 6 of 15
TECHNICAL DEPARTMENT – 3G Team, WIMAX & 3G COMPARISION
Radio Intro about Path loss models : Okumura-Hata model cont. Definition of parameters : hm mobile station antenna height above local terrain height [m] dm distance between the mobile and the building h0 typically height of a building above local terrain height [m] hb base station antenna height above local terrain height [m] r great circle distance between base station and mobile [m] R=r x 10-3 great circle distance between base station and mobile [km] f carrier frequency [Hz] fc=f x 10-6 carrier frequency [MHz] λ free space wavelength [m]
Okumura takes urban areas as a reference and applies correction factors Urban areas : LdB = A + B log10 R – E Suburban areas : LdB = A + B log10 R – C Open areas : LdB = A + B log10 R – D A = 69.55 + 26.16 log10 fc – 13.82 log10 hb B = 44.9 – 6.55 log10 hb C = 2 ( log10 ( fc / 28 ))2 + 5.4 D = 4.78 ( log10 fc )2 + 18.33 log10 fc + 40.94 E = 3.2 ( log10 ( 11.7554 hm ))2 – 4.97 for large cities, fc ≥ 300MHz E = 8.29 ( log10 ( 1.54 hm ))2 – 1.1 for large cities, fc < 300MHz E = ( 1.1 log10 fc – 0.7 ) hm – ( 1.56 log10 fc – 0.8 ) for medium to small cities.
DATE OF ISSUE 20/05/2007
TITLE 3G HSDPA & WIMAX
COMPARISON
CONTROL NO. NO. OF PAGES Page 7 of 15
TECHNICAL DEPARTMENT – 3G Team, WIMAX & 3G COMPARISION
Okumura-Hata model for medium to small cities has been extended to cover 1500 MHz to 2100 MHz LdB = F + B log10 R – E + G F = 46.3 + 33.9 log10 fc – 13.82 log10 hb E designed for medium to small cities 0 dB medium sized cities and suburban areas G =3 dB metropolitan areas Wimax Path Loss = UMTS path Loss*(x + log3.5)/(x + log2.1) Wimax Path Loss > UMTS path Loss
DATE OF ISSUE 20/05/2007
TITLE 3G HSDPA & WIMAX
COMPARISON
CONTROL NO. NO. OF PAGES Page 8 of 15
TECHNICAL DEPARTMENT – 3G Team, WIMAX & 3G COMPARISION
Design Conditions: • Area size: 10 km2, see graphic below.
Core: 150 subs/km2
50 subs/km2 50 subs/km2
• Type B land (medium – with no plains nor mountains) • 50% of the clients with telephone service
• Block average lower than 1%
• Clients´density • 50 clients per km2 in the surrounding area (2 areas of
2x2km2) • 150 clients per km2 in a core area of 1x2 Km2
• Re-use factor 1:10 (meaning that the average client will consume 51.2/13 kbps during peak hours)
• Average and maximum BER (lower than 10-4) • Maximum delay lower than 50ms • Base radio height: 20m • CPE height: 5 m • Frequency of platform work:
• Licensed band in 3.5 GHz, • Non-licensed band 5.8 GHz • Band of 2.3 GHz • Band of 2.5 GHz
• Area = 10 sqkm
• Core = 2 sqkm • Surrounding = 8 sqkm
• Traffic:
• Data Traffic • Core = 150 client/sqkm x 2 = 300 clients
TITLE 3G HSDPA & WIMAX
COMPARISON
DATE OF ISSUE 20/05/2007
CONTROL NO. NO. OF PAGES Page 9 of 15
TECHNICAL DEPARTMENT – 3G Team, WIMAX & 3G COMPARISION
• Surrounding = 50 x 8 = 400 clients • Average Peak Hour Rate, UL/DL = 13/51.2 kbps • Peak Rate, UL/DL = 130/512 kbps
• UL/DL ratio = 1:4 for TDD recommendation (20 percent UL)
• Overbooking Factor = 10 • Utilization = OBF/(Peak-to-Average Ratio) = 100
percent • Total Bitrate Capacity Needed for Data:
• TotalBitrate,DL= 700 x 51.2 /1000 = 35.8 Mbps • Voice Traffic (50 percent of clients at 30 mErlangs and 48
kbps) • 1 Erlang = 48kbps, 30 mErlangs = 48x.03*3600/8000 =
0.648 Mbytes/hr • Total voice traffic ~48x0.03/1000*350 = 0.51 Mbps
(only 1.5%, too small) • TotalBitrate,DL + Total voice traffic = 35.8 + 0.51 =36.3 Mbps
• Wimax Sites Needed = 36.3/12 ~ 3 sites(sectors) full capacity
(assuming 12 Mbps/site, 10 MHz) • With voice traffic, utilization factor needs to be within
tolerable delay (3 sigma) • Sites needed, with <80 percent utilization = 4 sites
(sectors).
• UMTS sites needed = 36.3/(2*14) = 36.3/22.5 = 1.29 ~ 2 sites(sectors)
UMTS WiMax Sites No. 2 3.7
TITLE 3G HSDPA & WIMAX
COMPARISON
DATE OF ISSUE 20/05/2007
CONTROL NO. NO. OF PAGES Page 10 of 15
TECHNICAL DEPARTMENT – 3G Team, WIMAX & 3G COMPARISION
Wimax, 3G and HSPA comparison
HSPA, HSDPA WiMAX
Channel bandwidth 5 MHz 1.75 - 20 MHz
Mobility Global, high-
speed Mobility is still
under deployment
Average downlink user data rate 1 - 2 Mbit/s 6 Mbit/s
Average uplink user data rate 384 kbit/s 2 Mbit/s
Typical cell radius 2 - 10 km 1 - 5 km
TCP roundtrip time 100 ms 20 - 50 ms
VoIP support yes yes
DATE OF ISSUE 20/05/2007
TITLE 3G HSDPA & WIMAX
COMPARISON
CONTROL NO. NO. OF PAGES Page 11 of 15
TECHNICAL DEPARTMENT – 3G Team, WIMAX & 3G COMPARISION
Downlink multiplexing OFDMAWimax
CDMAHSPA
Uplink multiplexing OFDMA CDMA
Modulation QPSK, 16QAM, 64QAM QPSK, 16QAM
Coding Turbo Turbo
Frequency scheduling Yes -
MIMO Yes Expected R7
HARQ Yes Yes
Scalable bandwidth 1.25 – 20 MHz No, 5 MHz
Frequency reuse Yes -
HSPA
i-HSPA
Wimax
BTS
BTS
BTS+adapter
RNC
ASNGWMobility
Mobility
Mobility
Security
Security
Security
IP header
IP header
IP header
ARQ
ARQ
ASNGW = access service network gatewayBTS+adapter = HSPA BTS + i-HSPA adaptera-GW = access gatewayMobility = handover controlSecurity = encryptionARQ = higher layer ARQ (L1 ARQ in BTS)IP header = IP header compression
CS+PS
MobilityARQ
L1 ARQ
DATE OF ISSUE 20/05/2007
TITLE 3G HSDPA & WIMAX
COMPARISON
CONTROL NO. NO. OF PAGES Page 12 of 15
TECHNICAL DEPARTMENT – 3G Team, WIMAX & 3G COMPARISION
Wimax 3G HSPA
Frequency reuse 1/3, 1/4 , 1, fractional
1 1
Mobile antenna Omni or directional
Omni Omni
Channel impairment Sensitive to doppler
Sensitive to multipath
Sensitive to multipath
Base station antenna Directional, array
Directional Directional
Main radio KPI SINR EcNo SINR (EcNo)
Dominant Traffic Data Voice Data
Handover Scheme HHO SHO HHO (HSDPA) SHO (HSUPA)
Own-cell Interference Adjacent subcarriers at high doppler
Other codes in the cell, non-orthogonality
issues
Other codes in the cell, non-
orthogonality issues
Capacity Expansion Increasing the OFDMA
bandwidth
More frequencies using Inter-frequency Handover
More frequencies
TITLE 3G HSDPA & WIMAX
COMPARISON
DATE OF ISSUE 20/05/2007
CONTROL NO. NO. OF PAGES Page 13 of 15
TECHNICAL DEPARTMENT – 3G Team, WIMAX & 3G COMPARISION
DATE OF ISSUE 20/05/2007
TITLE 3G HSDPA & WIMAX
COMPARISON
CONTROL NO. NO. OF PAGES Page 14 of 15
TECHNICAL DEPARTMENT – 3G Team, WIMAX & 3G COMPARISION
Conclusion: • WiMax is a promising technology and shouldn’t be ignored. • The WiMAX technology continues to evolve with the WiMAX Forum’s
approval of the Release-1 mobile WiMAX system performance profiles based on the 802.16e-2005 amendment. With OFDMA, mobile WiMAX can meet the stringent requirements necessary for the delivery of broadband services in a challenging mobile environment.
• These advantages will provide operators with added network capacity
for the support of value-added services. • Per the study above we need 2 UMTS sites to cover 10 Km²; on the
other hand we need 4 Wimax sites to cover the same area.
• To do deeper analysis for this technology, we recommend that we do a small trail WiMax network and test its performance and see if we can use it in hot spots and special applications.
____________________________________________
References: *Source Sylvain Ranvier / Radio Laboratory /TKK, 23 November 2004,[email protected] *Source: ABI, Gartner, IDC, In-Stat/MDR, Strategy Analytics, 2004 & 2005 *5 Source: Average of Strategy Analytics (2006), Gartner (2006) and Forward Concepts (2005) *Source: Strategy Analytics, Nokia evaluation *Deutsche Bank documents