Introduction to WiBro (Mobile WiMAX) - · PDF fileIntroduction to WiBro (Mobile WiMAX) ... 3G...
Transcript of Introduction to WiBro (Mobile WiMAX) - · PDF fileIntroduction to WiBro (Mobile WiMAX) ... 3G...
1©2005 Samsung Electronics
Introduction to WiBro(Mobile WiMAX)
Sep. 29. 2005
Han-Seok Kim
Samsung Electronics Co., Ltd.
2©2005 Samsung Electronics
Contents
Introduction to Mobile WiMAXWhy Mobile WiMAXMobile WiMAX services
WiBro in KoreaWiBro overviewWiBro project milestone
StandardizationMobile WiMAX vs. Fixed WiMAXSamsung contributions in 802.16e
Samsung Mobile WiMAX solutionNetwork architectureProduct roadmap
Research Issues
83
3©2005 Samsung Electronics
Introduction to Mobile WiMAX
4©2005 Samsung Electronics
What is Mobile WiMAX?
Mobile WiMAX is a Wireless Broadband access technology based on IEEE 802.16e standard.
WiBro is the Korean Wireless Broadband access service compliant with IEEE 802.16e standard.
Introduction to Mobile WiMAX
84
5©2005 Samsung Electronics
Korean Telecom Market TrendIntroduction to Mobile WiMAX
TTTT
Broadband MarketBroadband Market Mobile Data MarketMobile Data Market
0.3
7.89.9
11.2 11.8 12.2
2%
26%
64%73% 77% 79%
1999 2001 2002 2003 2004June, 2005Total broadband subscriberBroadband household penetration
13,813
534
14,941
1,204
15,861
2,217
17,447
3,326
2001 2002 2003 2004Cellular revenueMobile data revenue
(Unit: Million)(Unit: US $M)
Source: MIC Source: KISDI
■ Broadband market is saturated
■ Mobile data market is rapidly growing
Extend to new biz. Segment (Wireless)
Provide new service for mobile data users( More bandwidth per user andinexpensive service charge)
6©2005 Samsung Electronics
Challenges in Telecom. Biz
Limited SpectrumLimited Data Speed
Unlicensed SpectrumPortability
Wireline Broadband
Enough SpeedGood Quality
Subscriber SaturationNo Mobility
WiFi Hot Spot
Good CoverageInt’l Roaming
Camera/Polyphonic Good Voice Quality
3G Success3G Challenges&
Enhancement Enhanced3G
AdvancedWi-Fi
?
Enhanced Data RateEnhanced Services
(BCMCS, PTT, VoIP, etc)
Lack of CoverageLimited Public
Network Service
Limited SpectrumCost Issue
Introduction to Mobile WiMAX
85
7©2005 Samsung Electronics
Why Mobile WiMAX
Analysis of Customer Needs
WLANLimited Mobility
Limited Coverage
Needs of Enhanced Mobility,Coverage, Speed & Price advantage
Mobile WiMAX
Wireless Internet (1x+EVDO)Low Data SpeedExpensive Price
Mobility - HighPrice - HighSecurity - FairData Speed - Low
1. Ring-tone/Melody2. Game3. Music
1. Home (41 %)2. School/Work (31 %)3. In Movement (26 %)
Wireless Internet(EVDO)*
Mobility - HighPrice - LowSecurity - GoodData Speed - Fair
Mobility - LowPrice - LowSecurity - LowData Speed - High
Mobility - NonePrice -lowSecurity – GoodData Speed - High
Comparison
1. Commerce / Government2. Media / Public Safety3. VOIP / LBS/ Gaming
Similar with Broadband Internet Service
1. Information Search2. Game3. e-mail
Service
1.Enterprise2.Home residential consumer3.Lap top users, Multimedia
1. School/Work (72 %)2. Home (26 %)3. Airport ( 1 %)
1. Home (90 %)2. Company (30 %)3. PC Cafe (22 %)
Place
Mobile WiMAX **WLAN *Wired B.B. Internet *
* Source: NIDA (’04.10) ** Anticipated
Introduction to Mobile WiMAX
8©2005 Samsung Electronics
Positioning of Mobile WiMAX
HighThroughput
Fixed
DSL/Cable WLAN 4G Mobile Communication
3G Mobile Communication
Mobile WiMAX
Mobility
User Drivers- Always on Best Connected (ABC), Anywhere and Anytime- Inexpensive services and applications
Operator Drivers- Mobile broadband solution, not Fixed- Fixed Mobile Converged services/applications
Introduction to Mobile WiMAX
86
9©2005 Samsung Electronics
Mobile WiMAX Services Positioning
Mobile WiMAX services position enabler
1. Mobility- Service in 120km/hr- Fixed Mobile internet access- Dual mode service synergy
(802.16e + cellular)
2. Broadband- UL 512, DL 128kbps guaranteed
service- Cellular base Internet base- Rich contents multimedia service
3. Low cost- Low tariff to subscribe- Low investment risk
Low cost, mobile broadband networking
Mobility
High
BandwidthWide
xDSL
WLAN
2G
3G
802.16e
GuaranteedMobility
BroadbandInternet
Mobile WiMAX Services
10©2005 Samsung Electronics
MobileWiMAX
(802.16e)
Towards 4G Services
Core Technology
High Quality Streaming/
Multimedia
Voice Date Image/
Graphic
Video Data Rate
4GNG Mobile
Service
4GNG Mobile
Service
2G/2.5G3G
MobileAccess
FixedWirelessAccess
1995 2000 2005 2010
Cellular/PCS
WCDMA
Mobility
2.4GHzWLAN
5GHzWLAN
EvDo
Stationary
Pedestrian
High
Medium
OFDMAOFDMA
MIMOMIMO
SmartAnt.
SmartAnt.
• OFDMA : Orthogonal Frequency Division Multiplexing Access• MIMO : Multi Input Multi Output
802.16d
Introduction to Mobile WiMAX
87
11©2005 Samsung Electronics
802.16e Business Segment
. Wireline operators- Telefonica, UPC, Telkom- mmO2, M1: Wireless DSL: Wireless Backhaul: Orange
. Mobile operator- Sprint, KDDI, SKT- SingTel: High speed data network
. Bundle service - KT/KTF: Cellular + WLAN
. Wireline incumbents- KT, BT, FT : Expanding its business to
mobile market
. Greenfield operator- New player: Service convergence
VoIP
Mobile Nomadic
Introduction to Mobile WiMAX
12©2005 Samsung Electronics
802.16e Business Model
“Hotzone”
. Wireless DSL/Backhaul - Competition with FWA(802.16d)- WLAN complementary
. Wider and seamless Internet access
. Biz solution for private hotzone owner (shopping mall, Amusement Park)
“Mobile Broadband”
. Wireless based network convergence (DBDM terminal necessary)
- GSM, CDMA complementary- Mobile roaming market considered
Data
“WLAN + Cellular bundle”
“Alternative mobile”
. Wireline based network convergence (Supported by Single 802.16e terminal)
- IMS Core network useful
. Potential threat to mobile operator
Data +
VoIP
NomadicMobile
Introduction to Mobile WiMAX
88
13©2005 Samsung Electronics
Mobile WiMAX Services
MMS + IMVoIPPTA
- PTT (Push to talk- 1:N telephony) - PTD (Push to Data - Send data during PTT)- PTV (Push to Video - 1:N Video telephony)
Messaging &Communication
AOD/ MOD
VOD
Streaming Broadcasting
Interactive Gaming
Emergency
Surveillance
Security
Database Lookup
Telematics- Traffic Info.- Location search
LoBlog- LBS + Blog
LBS
Public SafetyPersonalized Multimedia
“Anytime, Anywhere and Any device”
Introduction to Mobile WiMAX
herehere
14©2005 Samsung Electronics
Mobile WiMAX Global Status
▪ Mobile WiMAX is so faster than expected. ’05.3Q: Mobile WiMAX Profile to be ratified. ’06.3Q: Mobile WiMAX Certification
▪ A Great momentum for Mobile WiMAX booming-up. ’07.1Q: Intel plans to roll out Mobile WiMAX chip to be embedded in Laptop
▪ Mobile WiMAX Show Case in Korea. ’06.4 @Korea: World 1’st commercial launch of Mobile WiMAX
▪ Superior performance to the other BWA technologies. vs. WiFi and Fixed WiMAX’06.4
▪ The major telecom vendors are participating in Mobile WiMAX, not “Monitoring”. Lucent, Alcatel, Motorola, ZTE, Huawei
Introduction to Mobile WiMAX
89
15©2005 Samsung Electronics
WiBro in Korea
16©2005 Samsung Electronics
WiBro overviewWiBro in Korea
The World 1The World 1stst TelcoTelco--grade commercial service grade commercial service by April 2006 in Koreaby April 2006 in Korea
WiBro is based on WiBro is based on Mobile WiMAX technologyMobile WiMAX technology and Mobile and Mobile WiMAX is fully compliant with WiMAX is fully compliant with IEEE 802.16e TDD OFDMA IEEE 802.16e TDD OFDMA StandardsStandards
WiBroWiBro is the is the ““WiWireless reless BroBroadbandadband”” service in Koreaservice in Korea
90
17©2005 Samsung Electronics
WiBro RegulationWiBro in Korea
Specification PolicySpecification Policy
Key RequirementsKey Requirements
▪WiBro is compliant with IEEE 802.16e standards▪WiBro is compliant with IEEE 802.16e standards
▪ Min. Transfer rate : DL=512 Kbps, UL=128Kbps▪ Channel bandwidth : ≥ 9MHz▪ Inter-Vendor Roaming▪ Frequency Reuse Factor is '1'▪ Duplex = TDD & Tx/Rx Time Slot Synchronization over operators
▪ Min. Transfer rate : DL=512 Kbps, UL=128Kbps▪ Channel bandwidth : ≥ 9MHz▪ Inter-Vendor Roaming▪ Frequency Reuse Factor is '1'▪ Duplex = TDD & Tx/Rx Time Slot Synchronization over operators
18©2005 Samsung Electronics
Fixed WiMAX(802.16d)
Mobile WiMAX(802.16e)
Freq: 3.5G, 5.8G, …
Ch. BW: 3.5(FDD), 7/10(TDD), …
MHz
Freq: 2.3G, 2.5G, 3.5G, …
WiBro
Freq: 2.3GCh. BW: 8.75MHz
Ch. BW: 1.25, 2.5, 5, 10, 15, 20,1.5, 3, 6, 12, 24,
1.75, 3.5, 7, 14, 28,4.375, 8.75, 17.5 MHz
WiBro positioning on WiMAX Forum
WiMAX forum profilesWiMAX forum profiles
WiBro in Korea
91
19©2005 Samsung Electronics
WiBro Concept
MobilityMobility MultimediaMultimedia ConvergenceConvergence UbiquitousUbiquitous
Trend
Cellular 3G
Concept of WiBro
WiBro
Mobile; ~ 60km/h
AnywhereAnytime
; Always onSeamless
High Throughput
; 1Mbps/user
Low price; Internet
flat fee
: WiBro is the stepping stone for 4G
WiBro in Korea
20©2005 Samsung Electronics
Aug. 2004 : Deliberation Committee of Policy
Sep. 2004 : Determination of the Selection Policy for WiBro Service Providers
Oct. 2004 : Announcement of the 2.3 GHz Bandwidth Allocation
Dec. 2004 : Request for the Business Proposal
Feb. 2005 : Selection of the WiBro Service Providers (KT, SKT)
Apr. 2006 : WiBro Service Open (Commercially)
Aug. 2004 : Deliberation Committee of Policy
Sep. 2004 : Determination of the Selection Policy for WiBro Service Providers
Oct. 2004 : Announcement of the 2.3 GHz Bandwidth Allocation
Dec. 2004 : Request for the Business Proposal
Feb. 2005 : Selection of the WiBro Service Providers (KT, SKT)
Apr. 2006 : WiBro Service Open (Commercially)
Korean WiBro Project MilestoneWiBro in Korea
92
21©2005 Samsung Electronics
WiBro/ IEEE 802.16e Standardization Status
Issue802.16e/D5
Issue802.16e/D6
Issue802.16e/D7
StandardRatification
Sep. 2004 Feb. 2005 April. 2005 Oct. 2005
WiBro Standardization Roadmap (by TTA)WiBro Standardization Roadmap (by TTA)
IEEE 802.16e Standardization Roadmap (by IEEE)IEEE 802.16e Standardization Roadmap (by IEEE)
• 802.16 d/e
Phase I Phase I Rev. Phase II
June 2004 Oct. 2004 4Q ‘04 ~ 4Q ‘05
WiBro
• 802.16 d/e
WiBro
• IOT Profile- Profile Statement(’05.1Q)- Spec Work (’05.2Q)- Spec completion (’05.3Q)
Select the IEEE 802.16e for the baseline of WiBro standardization (’04.July)
WiBro in Korea
22©2005 Samsung Electronics
WiBro Business Status in Korea
OperatorsKT, SKT
Commercial Service : KT(April '06)Spectrum
2300MHz ~ 2327MHz2331.5MHz ~ 2358.5MHz2363MHz ~ 2390MHz
OperatorsKT, SKT
Commercial Service : KT(April '06)Spectrum
2300MHz ~ 2327MHz2331.5MHz ~ 2358.5MHz2363MHz ~ 2390MHz
WiBro in Korea
93
23©2005 Samsung Electronics
Specification - Physical Layer
Frequency Band : 2.3 GHzChannel Bandwidth : 9MHz Multiple Access : TDD/OFDMAModulation : QPSK, 16QAM, 64QAM(DL Only)Channel Coding : CTC(Convolutional Turbo Code), CCKey Features : AMC, H-ARQ, etcFrame Length : 5msecMaximum Data Rate : DL-19.97 Mbps, UL-5.53 Mbps RAS Synchronization : GPSCell Coverage : urban ~ 1Km
WiBro in Korea
24©2005 Samsung Electronics
Flexible Bandwidth Allocation by MAP – Frame by Frame
Supports flexible QoS offering– BE, rtPS, nrtPS, UGS, ertPS
Efficient MAC PDU construction– Variable size MAC PDU– Fragmentation, Packing, Concatenation
Connection-orientedSupports header suppressionARQAwake mode / Sleep mode / Idle modeQCS (Quick Connection Setup)Handover– MBB(Make-Before-Break), BBM(Break-Before-Make)– FBSS(Fast BS Switching)
Specification - MAC Layer (1/3)WiBro in Korea
94
25©2005 Samsung Electronics
Specification-Network Layer
IP version– IPv4– IPv6
IP QoS– Diffserv– Packet classification and mapping to MAC transport connectionMobility– L2 mobility for seamless handover– Mobile IPAuthentication/Security– EAP / PKI– RADIUS / DIAMETERNetwork Management– SNMP– Self-configuration capability
WiBro in Korea
26©2005 Samsung Electronics
Standardization
95
27©2005 Samsung Electronics
802.16a(2003)
Amendment for N-LOS SystemsFixed wireless broadbandPHY: 2 - 11 GHz
802.16(2001) Fixed wireless broadband for LOS systems
MAC & PHY: 10 – 66 GHz
802.16c(2002)
Amendmentfor System Profiles
10 - 66 GHz
802.16-Revd(July 2004)
Revision PAR for 802.16, 802.16aFixed wireless broadband System Profiles, ErrataNow Approved as 802.16-2004!
802.16e(2Q 2005)
Amendment for Combined Fixed and Mobilewireless broadband at vehicular speeds in Licensed bands below 6 GHz
802.16f (MIBs)and 802.16g
(NETMAN) planned
802.16 Standards GenealogyEv
alua
tion
Path
Standardization
28©2005 Samsung Electronics
802.16 Technologies
1 to 3 miles
Same as REV d
Mobility, Regional Roaming
Same as REV d1K/512/128 OFDMA
Non line-of-sight
< 6 GHz
Estimate: 2Q of 2005
3 to 5 miles; Maximum range 30 miles based on tower height, antenna, gain and transmit power (among other parameters)
Selectable channel bandwidthbetween 1.25 and 28 MHz,with up to 16 logical sub-channels
Fixed and Portable
256 OFDM, 2K OFDMA64 QAM, 16 QAM, BPSK
Non line-of-sight (NLOS)
< 11 GHz
802.16a: Jan 2003802.16 REV d: Q3 2004
1 to 3 milesTypical Cell Radius
20, 25 & 28 MHzChannel Bandwidths
FixedMobility
QPSK, 16 QAM and 64 QAMModulation
Line-of-sight onlyChannel Conditions
10 to 66 GHzSpectrum
802.16a / REV d 802.16e
Dec. 2001Completed
802.16
Standardization
96
29©2005 Samsung Electronics
Mobile WiMAX vs. Fixed WiMAX
WiMAX Status• WiMAX currently focused on fixed applications i.e. 802.16d and
has growing membership (170+)• Major telco(3G) vendors are rushing in WiMAX• Nokia rejoined WiMAX and Samsung is the latest heavy hitter
Created Mobile Working Group focused on 802.16eunder WiMAX• Define mobility charter and structure with major stakeholders• Activate mobility technical WG and certified WG• Profile 802.16e standards (current D5 spec.) to WiMAX
specification• Time to market delivery of mobile wireless broadband • Harmonize major 3G vendors with full ecosystem vendors
Standardization
30©2005 Samsung Electronics
BPSK 1/2QPSK 1/12Low Rate Coding
Robust FEC, Fast link adaptation, Band-AMC,
Hybrid-ARQ in 16e
Mobile WiMax is > 3dB deeper than WiMax(estimated)
Building Penetration
No freq. planning for FRP=1 n (n≥3)1 or n ( n≥3)
Frequency Reuse pattern (FRP)
Delay spreadLow rate coding
Limited coverageFull coverageCoverage
Handover in 16eFixedFull mobility, FixedMobility support
CellDeployment
Mobile WiMax is > 30% higher than WiMax(estimated)
Average Throughput (Fixed application)
Scalable OFDMA in 16e
IEEE802.16-2004 = 16d802.16d802.16d + 802.16eStandard
DL : UL = 2 : 1DL: 18.32MbpsUL: 6.11Mbps
DL: 19.97Mbps UL: 5.53Mbps
Peak Throughput(SISO)Throughput
Performance(8.75MHz)
TDMAOFDM / TDDOFDMA / TDDAccess TechnologyTechnology
General2562048, 1024, 512, 128FFT Size
Fixed WiMAX NotesMobile WiMAX
Mobile WiMAX vs. Fixed WiMAX (For Fixed Applications)
Standardization
97
31©2005 Samsung Electronics
Not providedProvided(FBSS, Hard)Handover
MBS in 16eNot providedProvidedBroadcasting Service
Hand-held device in 16eAlways AwakeAwake modeIdle & Sleep modePower saving
Header compression (ECRTP, ROHC),
ErtPS in 16eBadEfficientVoIP
Fixed WiMAX NotesMobile WiMAX
Mobile WiMAX vs. Fixed WiMAXStandardization
32©2005 Samsung Electronics
Mobile WiMAX encompasses fixed applicationMobile WiMAX encompasses fixed application
Advantages over Fixed WiMAX
▪ More scalable bandwidth ▪ Comparable or superior to Fixed WiMAX▪ More scalable bandwidth ▪ Comparable or superior to Fixed WiMAX
Mobility supportMobility support▪ Up to 120km/h▪ Up to 120km/h
Enhanced Service FeaturesEnhanced Service Features▪ MBS (Multicast Broadcast Service) support ▪ VoIP facilities▪ Security
▪ MBS (Multicast Broadcast Service) support ▪ VoIP facilities▪ Security
Standardization
98
33©2005 Samsung Electronics
Samsung contributions to 802.16d/e
Samsung is a major contributor in 802.16d/eSubchannelization, H-ARQ, MIMO/AAS, Fast BS Switching (FBSS) ,
QCS (Quick Connection Setup), Idle mode
Play a role as an arbitratorHarmonize and Socialize with other participants
3G vendors (e.g., Nortel, Motorola), Intel, Runcom, etc.,LDPC (TI, Nextel, LGE, ZTE, Nortel, Motorola, Intel, Runcom)
Make special interest group as Ad hoc : Handoff, Security
2510654377Session #35 (Jan. ’05)
30142961973Session #34 (Nov. ’04)
3513275457Session #33 (Sep. ’04)
42120N/AN/ASession #32 (July ’04)
265352270Session #31 (May ’04)
SamsungTotalSamsungTotal
Number of ContributionsNumber of Comments IEEE 802.16 d/eMeeting
Standardization
34©2005 Samsung Electronics
WiMAX Forum Organization
Marketing WGMarketing WGMo Mo ShakouriShakouri
AlvarionAlvarion
Service Provider WGService Provider WGDean ChangDean Chang
ApertoAperto
Regulatory WGRegulatory WGMargaret Margaret LaBrecqueLaBrecque
IntelIntel
Certification WGCertification WGAdityaAditya AgrawalAgrawal
BeceemBeceem
Technical WGTechnical WGGordon Gordon AntonelloAntonello
OFDMOFDM--ForumForum
WiMAX ForumPresident: Ron Resnick
IntelApplication WGApplication WG
Tom Tom TofighTofighAT&TAT&T
Network WGNetwork WGPrakashPrakash LyerLyer
IntelIntel
New Groups
Mobility TGMobility TGWonWon--ilil RohRohSamsungSamsung
• WiMAX Forum is preparing Mobility Deployment
• Samsung is a Board Member of WiMAX Forum
• Samsung chairs the Mobility TG and is vice-chair of Network WG
• WiMAX Forum is preparing Mobility Deployment
• Samsung is a Board Member of WiMAX Forum
• Samsung chairs the Mobility TG and is vice-chair of Network WG
Standardization
99
35©2005 Samsung Electronics
Samsung Mobile WiMAX Solution
36©2005 Samsung Electronics
802.16e Network Architecture
WSM
WSM
RAS(Radio Access Station)ACR(Access Control Router) WSM(WiMAX System Manager)AAA(Authentication, Authorization and Accounting)HA (Home Agent)
Samsung Mobile WiMAX Solution
100
37©2005 Samsung Electronics
802.16e Network Architecture with IMS core
EdgeRouter
RAS
ACR
IMS Core Network
ACR
PDA
RAS
WSM
RAS
Subnet - 0 Subnet - 1
MSS MSSMobile MSS • MSS : Mobile Subscriber Station
• RAS : Radio Access Station• ACR : Access Control Router• WSM : WiBro System Manager
Backhaul Backhaul PSTN
IMS - MGW
Parlay GW
PTT AS
Presence AS
IM AS
HSSCCF EMS
AAA
DNS/ENUM
DHCP
IMS Server
MG Controller
Core Router
Core Router
Core Router
Core Router
• IMS : IP Multimedia Subsystem • MG / MGW : Media Gateway• PTT : Push-to-Talk• AS : Application Server• IM : Instance Messaging• CCF : Charging Collection Function• HSS : Home Subscriber Server• EMS : Element Management System
MRSystem
Samsung Mobile WiMAX Solution
38©2005 Samsung Electronics
Network Elements: WSM
SNMP, FTP
HTTP, RMI
Protocol
Customizable
FE/ GE
100 Base-T
Interface
Server NMS
EMS : SNMPPerformance Data: FTPServer ACR, RAS
Server Client
noteItems
Network Management Center
Printer
PrinterPrinter
CORBA,SNMP,CMIPWSM Server
SNMP
HTTP ,TCP/IP
NMS Interface
GUIInterface
NetworkInterface
Mgmt. Function-FCAPS
WSM GUI Client(Java/Web App. on
any platform )
SNMP
(customizable)OSS
IP Network SNMP
RAS
ACR
RAS
Samsung Mobile WiMAX Solution
101
39©2005 Samsung Electronics
Network Elements: RAS, ACR
RASRAS
PHY Processing, Air Resource Scheduling MAC Management Message ProcessingMAC PDU ProcessingCID ManagementEncryption /DecryptionACR InterfaceInter-sector HO Processing
ACRACR
802.16e Access Network
802.16e Access Network
Packet Classification & Header SuppressionService Flow
ManagementTraffic Switching/ Integration PointHandover ManagementSession ManagementRAS InterfaceCore Networks Interface
Samsung Mobile WiMAX Solution
40©2005 Samsung Electronics
Mobile WiMAX Product Roadmap
Universal RASmulti-FA/multi-
sector, 20W
RANRANRAN
RASRASRAS
ACRACRACR
TerminalTerminalTerminal
’06.1QDomestic Product
2.3GHz‘07
All products, dates, plans and features are preliminary and subject to change without notice.
The first Mobile WiMAX System/Terminal available 1Q The first Mobile WiMAX System/Terminal available 1Q ‘‘0606
Campus RAS
Home RAS
Hybrid ACR
Std RAS3FA/3S, 20W
Mini RAS3FA/Omni, 20W
Std. ACR
’06.2QOverseas Product
2.3/2.5/3.5GHz
CPECPECPE
PhoneType
PhonePhoneTypeType
PCMCIA Card
MITS Phone
External Modem
Samsung Mobile WiMAX Solution
102
41©2005 Samsung Electronics
Research Issues
42©2005 Samsung Electronics
Research Issues
ARQImpact of ARQ parameters such ARQ block size, max number of retransmissionsIP-aware MAC such as ARQ operation based on not only ARQ block but also IP packetvs. H-ARQ
SchedulerLess complex, more efficient, better QoS
HandoverLess overhead, shorter break time
Etc
103
43©2005 Samsung Electronics
Thank You!Thank You!
104