802.16 – A Worldwide Broadband Mobile Internet...
Transcript of 802.16 – A Worldwide Broadband Mobile Internet...
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802.16 – A Worldwide Broadband Mobile Internet Standard
A. PaulrajStanford University
NIST, MRAOctober 6, 2005
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Outline
l Broadband Services, Status and Marketsl Core Technologyl 802.16e Features and Differentiationl Radio Network PHYl Radio Network MACl Core Network l Summary
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802.16e Services
Indoor terminal Mobile terminal Consumer DevicesPortable terminal
Broadband Multimedia Information / Entertainment over IP
Fixed Mobile Convergence
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1 10 100
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Wireless Internet Standards
Avg Data Rate (Mbps) per BS radio
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4G
3.5G
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16e Market Start Dates
16e spans multiplemarkets
802.16e802.16e
2006 2007 2008 2009 2010
Mobile
Nomadic
Fixed
China
Japan
& USKorea
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16e Standards Statusl Evolution of 802. 16d to support mobility l 95% completel Adds new functionality – Scalable OFDMA, H-ARQ,
MIMO, ..
1Q/2004 1Q/2005 1Q/2006
PA
R A
pp
vd
16e is significantly more advanced than 802.16d
Sp
on
sor
Bal
lots
Free
ze
Co
mp
lete
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WIMAXl Industry profile harmonization bodyl WIMAX – 16d
– Certification infrastructure set up, starting soon
l WIMAX – Mobile– MTG– NWG– Certification infrastructure being set up
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3.5G Technologies
~ 2.5 million gates~ 1 million gates~1.2 million gatesBB complexity(incl. memory)
TDD / FDDFDDFDDDuplexing
200520052005Deployment
YesYesYesStandards compatibility
+ OFDM- MAC HARQ
*
+ IP at BTS
- CDMA+ PHY HARQ- IP at RNC
**
- CDMA+ Low latency- IP at RNC
**
Bandwidth efficiency features
BTSRNC/PDSNRNC/PDSNIP termination
20 Mbps2 Mbps1.8 MbpsUL peak data rate
70 Mbps20 MHz
14.4 Mbps5 MHz
3.07 Mbps1.25 MHz
DL peak data rateBandwidth
WiMax (802.16(e))HSDPADO Rel A
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Outline
l Broadband Services, Status and Marketsl Core Technologyl 802.16e Features and Differentiationl Radio Network PHYl Radio Network MACl Core Network l Summary
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Opportunistic Scheduling (OS)
Scheduling users with maximum rate ( channel gain), improves sum capacity
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Capacity and Delay in OS
C ~ O ( log log K ) K users Delay ~ O ( K log K ) for Prop. Fair Scheduling
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OFDMA
l Users allocated to sub channelsl No multi-path and multi-user interferencel Permits frequency specific user power, bandwidth
allocation, pre-coding, beam forming,…
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OFDMA vs CDMA Single Sector
NoYesFrequency selectivewaterfilling
DifficultYesFreq. selective beamforming / pre-coding
Needs equalizerAvoids*Multi-user interferenceon DL
Needs equalization, noise enhancing
Avoids*Multi-path Interference
CDMAOFDMA
*OFDMA advantage 20% or bigger in wideband Multi-path rich urban channels. OFDMA advantage stronger at high SNRs
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Opportunistic OFDMA
C ~ O ( log log K )Every subchannel is scheduled based on max C/I
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MIMO
Tx
Use spatially diverse channels to support increased sum rates
Rx
Rx
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Opportunistic MIMO
Choose users who such that orthogonal Tx modes couple to the best available modes to maximize sum capacity.Users use linear processing only which is optimal
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Opportunistic OFMDA+MIMO
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Interference Sources – Per OFDMA MIMO Tile
l Multiple sectors in cell use same tile (sector reuse - antenna pattern separation)
l Multiple cells use same tile (cell reuse - cell-to-cell geographic separation)
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OFDMA vs CDMA Multi-Sector
Variable spreading, Interference cancellationInterference averaging
Variable reuseInterference avoidanceInterference cancellation Variable spreadingInterference averaging
Multi-sector/cell interference
CDMAOFDMA
Both OFDMA and CDMA have interference variability issues
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Interference Management, Cont’d
l Interference avoidance (variable reuse) – Drop reuse for selected tiles
l Power control– Power control across sectors / cells to
increase sum capacity
l Variable spreading, interference averaging and link adaptation
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Outline
l Broadband Services, Status and Marketsl Core Technologyl 802.16e Features and Differentiationl Radio Network PHYl Radio Network MACl Core Network l Summary
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16e Key Features-1l Flexible configuration to suit regional needs
– Channelization 10, 5, 3.5,.. MHz– Band plans 2.3-2.4, 2.5-2.7, 3.4-3.5 GHz– Fixed Mobile Convergence
l Broadband services delivered over IPl Mobility support (capacity degrades
gracefully > 60 Kmph)l All IP core network architecturel Single frequency network deployment
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16e Features - 2l Future proof
– Support any applications running over IP– Advanced PHY and MAC with 4G features
l Low power / high energy efficiencyl Low cost - $ / Mbps / Sq. Km
– Standards based, wider pipes, low IPR overhead, end-to-end IP, simpler to develop, deploy and manage.
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Design Tradeoffs Comparison
D/L Bandwidth Latency
IP Orientation
MobilityCoverage
Intg. Voice
802.16e
3GPP/PP2
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16e Offers Multi-Service Capability
l Fixed Mobile Convergence - Single RN and similar CN infrastructure
l Can upgrade from fixed to mobility without forklift
l 16e outperforms 16d in fixed / portable applications
l Performance in fixed / portable about 2X of mobile
l Better value chain and volume benefits customers and service providers
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Outline
l Broadband Services, Status and Marketsl Core Technologyl 802.16e Features and Differentiationl Radio Network PHYl Radio Network MACl Core Network l Summary
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Outlinel Broadband Services, Status and Marketsl 802.16e Features and Differentiationl Radio Network PHYl Radio Network MACl Core Network l Summary
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PHY Featuresl OFDMA with variable power, spreading and
reuse
l Fine grain modulation and channel coding
l Space time Coding
l Pre-coding
l Fast link adaptation
l Hybrid ARQ
l Advanced interference management
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OFDMA Advantagel Avoids multi-path and intra-sector
interferencel Sub-channelization balances link on U/L for
low power terminalsl Higher spectral efficiency compared to CDMA
for broadband packet accessl Access to frequency dimension offers greater
flexibility in using resourcesl Cleaner and simpler incorporation of MIMO
OFDMA offers 1.5 X performance over CDMA
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Inter Cell Interference Mgt.
l Variable power (Power Control)l Variable spreading via repetition codingl Variable frequency reuse - 1x1 and 1x3 hard
reuse zoning and soft (opportunistic) reuse l Interference averaging in certain modesl Multi-antenna can provide interference
rejection
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Multiple Antenna Supportl Improves capacity and coverage through
– Space diversity, Beam forming, Spatial multiplexing and Interference cancellation
l Unified multi antenna mode captures all these leverages via– MIMO Zone with ST coding and Pre-coding
to exploit channel state information at Tx
Multiple Antennas Offer x2 to x3 performance over SISO Systems
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TDD and FDD
GoodFairHardware simplicity
EssentialOptionalBS Synchronization
EasyDifficultDL/UL Asymmetry
FairGoodFrequency Availability
TDDFDDItem
Both modes supported. TDD has 1.20 X advantage forbroadband asymmetric services
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Outlinel Broadband Services, Status and Marketsl Core Technologyl 802.16e Features and Differentiationl Radio Network PHYl Radio Network MACl Core Network l Summary
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MAC Featuresl Full wireless QoSl Uses header compression (ROHC, IPHC),
addressing, fragmentation and packing to increase efficiency
l Packet sizes adapted to trade throughput and latency
l Scheduling in frequency-time is SNR, channel and QoS aware
l Unicast, and IP multicast / broadcast groups supported
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Schedulerl IP QoS awarel Down link - Incoming traffic is classified
based on IP QoS (Int Serv/ RSVP, Diff ServAF, EF, BE) and then allocated bandwidth.
l Up link - Bandwidth is allocated for UGS, or via requests from polling or light weight contention channel requests
l D/L and U/L MAPs broadcast on burst profiles
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QoS
Best EffortBE
Non Real time Polled Srv(nrtPS)
Real timePolled Srv(rtPS)
UGS
SchedulingClass
BackgroundLowEmailFTP
InteractiveTFTPHTTP
ModerateWeb browse, messg, games
StreamingVBR
HighVOIP, Streaming Video
TDM voiceNo delayVoice
QoS ClassDelay Sensitivity
Application
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Multi-User Diversity Scheduling
FreqTime
User 1
User 2
l Maps users to tiles (Freq.-time) with most favorable channel
l Outperforms similar approaches in CDMA
l Performance gain about 2X with 25 users in the pool
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Radio Link Protocol
l Efficient ARQ or H-ARQ with chase combining and incremental redundancy
l Fast ACK/NACK channel.l Power boost to force H-ARQ packet
terminationl Low round trip times, avoids TCP time outs
and supports interactive datal ARQ resets in handoffs (packet losses)
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Outlinel Broadband Services, Status and Marketsl Core Technologyl 802.16e Features and Differentiationl Radio Network PHYl Radio Network MACl Core Networkl Summary
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Nominal Protocol Stack
PHY
MAC
RLC
PPP
Mobile IP
IP IP IP
Mobile IP Mobile IP
PPP
RLC
MAC
PHY PHY PHY PHY
LinkLinkLink
Terminal BS + Router + FA Home agent
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CN Architecture
l All IP corel Mobile router integrated into BS and eliminates
number of boxes (SGSN / PDSN, RNC,..) and flattens the network
l Easier scalability as intelligence is pushed to the edge (BS)
l Handoff supported through mobile IP with Home Agent, Foreign Agent and handoff extensions
l External corresponding node shielded from mobility l Efficient IP multicast
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IP Core Network
Servers
HomeAgent
Managed IP Domain
Public IP Domain
Border Gateway
Base Station + Routers
DHCPDNSAAA
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Router Integrated Base Stationl BS is IP aware and hence scheduler can enforce IP
QoSl Local processing improves response time (for
scheduling, AMC, ARQ) and overall lower latencyl Tightly coupled RLC, ARQ and scheduling for cross
layer functions and QoS performance on handoffs
PHYMAC
FA
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Mobile IP HandoffCorrespondingNode
Servers
HomeAgent
Managed IP Domain
Public IP Domain
Border Gateway
FACO A2
DHCPDNSAAA
xFACO A1
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Handoffl Minimum packet loss and latencyl Layer 2 handoff
– HA uses vanilla Mobile IP– FA uses Mobile IP + Handoff extensions
l Layer 1 handoff– Hard handoff likely to be finalized – Soft handoff more complex and will not enter
current Rev
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Outlinel Broadband Services, Status and Marketsl 802.16e Features and Differentiationl Radio Network PHYl Radio Network MACl Core Network l Summary
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Deployment Issuesl No frequency planning (SFN)l Easier scalability / cell splittingl Ideal frequency band around 1.8- 2.7 GHz,
some reduction in performance above 3.0 GHz particularly for mobility
l Co-located on current cellular towers with another tier of antennas
l CN can use same managed IP domain supporting current cellular network
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16e Network will be Cheaperl International standard with early volume
ramp ups in Korea, ..l Broader pipes – lesser BS to deployl Simpler system to develop (OFDMA), less
internally coupled than CDMA. Less optimized also.
l Simpler network to fine tune in deployment (OFDMA)
l Much lower intellectual property overhangl All IP delivery and simpler IP core network
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Summaryl 802.16e offers lowest cost option for
broadband wireless l First trials in 4Q/05l Multi-service network can be evolved from
fixed to mobile seamlesslyl Future proof technology with many 4G
features
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Outline
l Broadband Services, Status and Marketsl Core Technologyl 802.16e Features and Differentiationl Radio Network PHYl Radio Network MACl Core Network l Summary