ieee 802.16 mac and phy specifications for broadband...
TRANSCRIPT
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IEEE 802.16 MAC and PHY Specifications
for Broadband WMAN
國立中興大學資工系 曾學文
Tel : (04)22840497 ext. 908 E-mail: [email protected]
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Part Source : Roger B. Marks, National Institute of Standards and
Technology Boulder, Colorado, USA Chair, IEEE 802.16 Working Group
http://WirelessMAN.org
http://www.intel.com/idf
Resources
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Broadband Access to Buildings
• Wireless Metro Ethernet – 802.11 Wireless Ethernet
• First/Last mile access – Fast local connection to network
» 30%-40% Radio/TV pervasion » 5% internet access
– Target Applications (similar as DSL and CableModem) » Data » Voice / Audio » Video distribution » Real-time videoconferencing
• High-capacity cable/fiber to every user is expensive
– Network operators demand it – Business and residential customers demand it
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Comparisons of Wireless Standards
Source: International Telecommunications Union and WiMAX Forum
802.20
Fixed (Stationary)
Pedestrian (Nomadic)
Mobile (Vehicular)
2G/2.5G Cellular
0.1 1.0 10 100
Peak Data Rate per User (Mbits/second)
Mob
ility
Commercial Proposed
79 x 1 MHz Bluetooth > 100 UWB
<= 20 802.16 5 HSDPA
1.25
1xEV-DO, 1xEVDV, 802.20
1.25 2G/2.5G
Bandwidth (MHz)
Bandwidth Assumptions
WWAN (IMT-2000)
cdma2000® 1xEV-DO, cdma2000® 1xEV-DV
3.1
WCDMA HSDPA
802.15.1 (Bluetooth)
802.11 (WLAN)
802.16e
802.16a (WiMAX)
802.15.3a (UWB)
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Current Status
Source: Intel, the WiMAX Forum
• More Than 350 Operator Trials and Deployments in 65+ countries!
• List of operators – http://en.wikipedia.org/wiki/List_of_Deployed_WiMAX_networks
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4G (beyond 3G) / IMT Advanced
• 4G, a term used to describe the next complete evolution in wireless communications,
– is being developed to accommodate the quality of service (QoS) and rate requirements set by forthcoming applications for "anytime-anywhere".
• The 4G working group has defined the following as objectives of the 4G wireless communication standard:
– A nominal data rate of 100 Mbit/s while the client physically moves at high speeds relative to the station, and 1 Gbit/s while client and station are in relatively fixed positions
– Smooth handoff across heterogeneous networks – Seamless connectivity and global roaming across multiple
networks – High quality of service for next generation multimedia support
(real time audio, high speed data, HDTV video content, mobile TV, etc)
– An all IP, packet switched network.
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Wireless Broadband Evolution to 4G
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Standard Family Radio Tech Downlink (Mbps)
Uplink (Mbps) Notes
WiBro WiBro OFDMA 50 50 Mobile range (900 m)
802.16e WiMAX MIMO-SOFDMA 70 70 Quoted speeds only achievable at very short ranges, more practically 10 Mbit/s at 10 km.
HIPERMAN HIPERMAN OFDM 56.9 56.9
Flash-OFDM Flash-OFDM Flash-OFDM 5.3 10.6 15.9
1.8 3.6 5.4
Mobile range 18miles (30km) extended range 34 miles (55km); mobility up to 200mph (350km/h)
iBurst iBurst 802.20 HC-SDMA/TDD/MIMO 64 64 3–12 km
UMTS W-CDMA
HSDPA+HSUPA UMTS/3GSM CDMA/FDD
0.384 14.4
0.384 5.76
HSDPA widely deployed. Typical downlink rates today 1–2 Mbit/s, ~200 kbit/s uplink; HSPA+ downlink up to
Pre-4G
Source: Wikipedia
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HSPA (High speed packet access)
• HSPA+ boosts peak data rates to 42 Mbps on the downlink and 22 Mbps on the uplink
– Use MIMO and higher order modulation • HSDPA (D = downlink)
– 14.4 Mbps in downlink – 174 commercial networks in 76 countries – Can be achieved by software upgrade of
existing 3G networks • HSUPA (U = uplink)
– 5.76 Mbps in uplink
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LTE (Long term evolution) • Third Generation Partnership Project (3GPP)
Release 8 Standards in progress (expected 2009) – a project within the 3GPP to improve the UMTS
mobile phone standard
• Air interface is a completely new systems – based on OFDMA in the downlink and Single-
carrier-FDMA (SC-FDMA has low PAPR) in the uplink that efficiently supports multi-antenna techologies (MIMO).
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Wireless Metropolitan Area Network
Relay
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Application
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Fixed WMAN + Mobile WMAN
Source : WiMAX Forum
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WiMAX + Wi-Fi for Mobile Internet
• Wi-Fi -> best solution for local area connectivity – With up to 450 Mbps throughput, MIMO-enabled 802.11n enables new local
area applications – Wi-Fi hotspots easy to find in most places
• Mobile WiMAX -> metropolitan-wide broadband coverage – Offers service providers 3x the latest HSPA (3G) capacity today – Potential to scale to over 20x the capacity of today’s HSPA via more
antennas over time
Home
Work
Travel
Hot Spot
WiMAX Tower
Auto
Rural Outdoors WiMAX Tower
WiMAX WiFi
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Network Usage Model
Source : WiMAX Forum
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Features (1/2)
• Broad bandwidth – Up to 134.4 Mbit/s in 28 MHz channel (in 2-66 GHz)
» 32Mb/s - 134.4Mb/s (>=20MHz per channel) » 1.25/2.5/5/10/14/20/25/28MHz per channel (3.5MHz/7MHz)
• Supports multiple services simultaneously with full QoS – Efficiently transport IPv4, IPv6, ATM, Ethernet, etc. – Wireless transportation system.
• Bandwidth on demand (frame by frame) – Similar to HIPERLAN Type II (frame-based protocol) and DOCSIS – Centralized control
• MAC designed for efficient used of spectrum • Comprehensive, modern, and extensible security
()tensions to mobility are coming next.
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Features (2/2)
• Supports multiple frequency allocations from 2-66 GHz in 802.16 (10-66GHz) , 802.16a (2-11GHz) and 802.16e (<6GHz) and 700MHz
– Single carrier (SC) for line-of-sight situations – OFDM and OFDMA (MC) for non-line-of-sight situations
» OFDM : orthogonal frequency division multiplexing » OFDMA : orthogonal frequency division multiple access
• OFDMA = 1.25 MHz, 2.5, 5, 10, 14 and 20 MHz channels
• Access schemes: – TDD (time division duplex) and FDD (frequency division duplex)
• Link adaptation: Adaptive modulation and coding • Point-to-multipoint (star) topology and mesh network extension • Support for adaptive antennas and space-time coding (in 802.16a) • Extensions to mobility. (IEEE 802.16e started from Jan. 2003
and declared in 2005)
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TDMA/OFDM/OFDMA
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Point-to-Multipoint configuration
• Two components – Subscriber Stations (SSs)
» SS typically serves a building (business or residence) – Base Station (BS)
» connected to public networks » BS serves Subscriber Stations » provide SS with first-mile(or last mile) access to public networks
• Compared to a Wireless LAN
– Multimedia QoS – Not only contention-based – Connection-oriented – Many more users – Much higher data rates – Much longer distances
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Mesh Topology (defined in 802.16a)
• Dynamic topology – Self-organizing network – More complicated
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Relay Topology (defined in 802.16j)
Mobile Multihop Relay
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Relay Topology (defined in 802.16j)
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Adaptive modulation and coding
Source : WiMAX Forum
Full featured Standard
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WiMAX Forum
• WiMAX (Worldwide Interoperability for Microwave Access)
– Like WECA in IEEE 802.11 WLAN • Mission:
– To promote deployment of BWA by using a global standard and certifying interoperability of products and technologies.
• Principles: – Support IEEE 802.16x – 2-66 GHz (16a : 2-11GHz, 16 : 10-66GHz and 16e <6GHz) – Propose access profiles for the IEEE 802.16 standard – Guarantee known interoperability level – Open for everyone to participate
• Developing & submitting baseline test specs
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WiMAX Evolution
Source : Siemens, 2004 802.16j relay
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IEEE 802.16 vs. ETSI • Frequent communications between 802.16 WG and ETSI
(European Telecom Standards Institute)
• ETSI HIPERACCESS – Above 11 GHz (outdoor , 11- 40GHz, 5Km, 25Mb/s) – ETSI began first, but IEEE finished first – 802.16 has encouraged harmonization
• ETSI HIPERMAN – Below 11 GHz (outdoor) – IEEE began first – Healthy cooperation – Harmonized with 802.16a OFDM
• ETSI HIPERLINK –17GHz (150m, point-2-point) –155Mb/s (OC3) –Irrelative with 802.16
• ETSI HIPERLAN –5GHz (indoor/outdoor) –6-54Mb/s –Irrelative with 802.16
HIPERMAN
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802.16 Standard History
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IEEE 802.16 Standard and amendments • Fixed Broadband Wireless Access (FBWA) Systems • Air Interface (MAC and PHY)
– Band 10-66GHz (ranges 1/2/3 : 10-23.5GHz/23.5-43.5GHz/43.5-66GHz) 25/28MHz per channel
– line-of-sight (LOS) requirement – One PHY
» WirelessMAN-SC (Single Sarrier) – Point-to-Multipoint Topology (Star) – TDD/FDD option with burst profile (depending on SNR) – Completed in October 2001 – Published in April 2002
• Follow up interoperability projects – 802.16c (Profiles): published in Jan 2003 – 802.16.1 (PICS)
» PICS : Protocol Implementation Conformance Statement – 802.16.2 (“10-66GHz Coexistence of FBWA Systems”)
» Focus on 23.5 to 43.5 GHz (local multipoint distribution service (LMDS), millimeter wave, etc.,)
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IEEE 802.16a Standard
• “Medium Access Control Modifications and Additional Physical Layer Specifications for 2–11 GHz”
– Band 2-11GHz – Non-line-of-sight (NLOS) requirement and Multi-path issue – Near-LOS – License-exempt band 5-6 GHz (802.11a and HIPERLAN II) – Three PHYs
» WirelessMAN-SC2 (single carrier) » WirelessMAN-OFDM (multiple carriers with 256-point transform)
• is mandatory for license exempt bands » WirelessMAN-OFDMA (multiple carriers with 2048-point transform)
• Multiple access is provided by addressing a subset of the multiple carriers to individual receivers
• Scalable : 128, 512, 1024 and 2048 – Advanced Antenna Systems (AAS) (optional) – Add mesh network topology (MAC) – provide automatic repeat request (ARQ) – retransmission (MAC) – Completed in November 2002 and Approved April 2003
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IEEE 802.16a Standard
• license-exempt bands below 11 GHz – The PHY and MAC introduce mechanisms such as dynamic
frequency selection (DFS) to detect and avoid interference.
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IEEE 802.16-2004 Standard
• IEEE Std 802.16™-2004 – “Air Interface for Fixed Broadband Wireless Access
Systems” - IEEE 802.16d – Approved 24 June 2004 – This standard revises and consolidates IEEE Std 802.16-
2001, IEEE Std 802.16a™-2003, and IEEE Std 802.16c™-2002.
• IEEE Std 802.16f – 16-2004 MIB
• IEEE Std 802.16i
– 16e-2005 MIB (baseline only)
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IEEE 802.16e
• “Amendment for Physical and Medium Access Control Layers for Combined Fixed and Mobile Operation in Licensed Bands”
– Focus on 2-6GHz (700MHz is considered now)
– 1.25-20MHZ per channel – Enhance OFDMA PHY (w/ subchannelisation)
• Data rate – 10Mhz/channel, OFDMA-64QAM provides 30Mbps
• Max. moving speed : 120km/h (vehicle) • Range : several Kms • Chip appear in 2006 • vs. IEEE 802.20
– Below 3.5GHz – Max. moving speed : 250Km/h (high-speed train) – vs. 3G
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Mobile WiMAX Release 2.0
• Release 2.0 is based on the IEEE 802.16m System Requirements Document
• 802.16m mirrors IMT-Advanced Requirements – Key Performance Targets are:
» Increased DL/UL peak channel & user data rate » 2x DL spectral efficiency of Release 1.0 (2.6 bps/Hz) » 2x cell-edge DL user throughput of Release 1.0 (0.09 bps/Hz) » 2x UL spectral efficiency of Release 1.0 (1.3 bps/Hz) » 2x cell-edge UL user throughput of Release 1.0 (0.05 bps/Hz) » Reduction of the connection setup, RAN delay, & handover interruption time » >60 concurrent sessions per MHz per sector for the adaptive multi-rate (AMR)
12.2 kbps speech codec » Multi-Carrier support for contiguous or non-contiguous channels (up to 100
MHz operating BW with band aggregation) » Mobility support up to 500 km/hr
• Mobile WiMAX Rel 2.0 is backwards compatible with Rel 1.5 and Rel 1.0
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IEEE 802.16m
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Logical network reference model, control plane
IB and A interfaces : Transport protocol is not specified
802.16e-2005 NCMS
Network Control and Management System (NCMS) Authentication Service Agency (ASA)
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Network Model
Source : Intel IDF
MS
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MS Mode Transition • Three Modes:
– Idle mode » allows an MS to become periodically available for DL broadcast traffic
without registration at a specific BS » MS traverses an air link environment populated by multiple BSs » allows the MS to conserve power and operational resources (such as
CID, SFID, periodic ranging…) » Listen MOB_PAG-ADV with Paging Controller ID » May perform Idle Mode Location Update Process
– Normal mode (Active mode) » MS transmits and receives packets to/from a BS.
– Sleep mode » to minimize an MS power usage and decrease usage of serving BS air
interface resources by pre-negotiated periods of absence from the serving BS air interface.
» Listen MOB_TRF-IND
• Sleep Mode operation is defined between MS and BS only – NCMS does not need to manage Sleep Mode of subscriber
• NCMS only manages MS in Normal Operation and Idle Mode
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MS Mode Transition (BS view)
Hold mode
Active mode
Park mode Bluetooth
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MS Mode Transition (NCMS view)
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Handover (HO)
• An mobile station (MS) migrates from the air-interface provided by one BS to the air interface provided by another BS
• Backbone network: – Similar to Distribution System (DS) defined in 802.11 WLAN – connect BSs – outside the scope of this standard
• Two HO variants:
– break-before-make HO: service with the target BS starts after a disconnection with the previous serving BS.
– make-before-break HO: service with the target BS starts before disconnecting to the previous serving BS.
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Handover (HO)
• Two HO methods: – Macro diversity handover (MDHO)
» migrate to the air-interface provided by other one or more BSs. » diversity combining on uplink and downlink at MS/BSs
– Fast BS switching (FBSS) » fast switching mechanism to improve link quality » MS is only TX/RX data to/from one active BS (anchor BS) at any
given frame. » The anchor BS can change from frame to frame depending on the
BS selection scheme. • Diversity set:
– contains a list of active BSs to the MS. – is applicable to MDHO and FBSS.
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BS Terms Defined in 802.16e
• Neighbor BS: – whose downlink transmission can be received by MS
• Serving BS: – MS has most recently completed registration at initial network-
entry or during a handover (HO) • Target BS:
– intends to be registered with at the end of a handover (HO) • Active BS:
– is informed of the MS capabilities, security parameters, service flows and full MAC context information.
– For macro diversity handover (MDHO), the MS TX/RX data to/from all active BSs in the diversity set.
– All involving BSs during HO • Anchor BS:
– The MS is registered, synchronized, performs ranging and monitors the downlink (DL) for control information.
– For FBSS supporting MS, this is the serving BS that is designated to transmit/receive data to/from the MS at a given frame
– Play the role of active BS, serving BS and Target BS.
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ID Terms Defined in 802.16e • Paging Controller ID (48-bit : MAC address of BS)
– is a logical network identifier – For the serving BS or other network entity retaining MS service and
operational information – For administering paging activity for the MS while in Idle Mode – Paging Controller ID = BSID when BS is Paging Controller
• Paging Group ID (16-bit : Cellular Network) – One or more logical affiliation grouping of BSs
• Serving BSID (48-bit) (24 : operator ID) – Used for Handover
• HOID (8-bit) – Handover Transaction ID
• Service Level Prediction Index (2-bit) – Predict capability of supporting service flows
• Power_Saving_Class (6-bit) – Associate with sleep parameters
• Power Saving Class Type (2-bit) – Associate with QoS bahavior
• SLPID (10-bit) – Used for traffic indication (directed or bit-mapping) – max. 1024 MS in sleep mode in one BS
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ID Terms Defined in 802.16e
• SPID (2-bit) – Subpacket ID used in HARQ
• Temp BSID (3-bit)
– BS index in BS_NBR-ADV List – Diversity Set Member ID – Used for MDHO and FBSS – Also used for fast Anchor BS selection feedback
• MBS_Zone ID
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Resource Frequency Assignment
• frequency assignment (FA) index – is used in combination with operator specific configuration
information provided to the MS – outside the scope of this standard
• frequency assignment (FA) – a logical assignment of downlink – DL center frequency and channel bandwidth programmed to
the BS
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Mobile WiMAX Roadmap
IEEE802.16REV2
Network Specifications
WiMAX NetworkRelease 1.0
WiMAX NetworkRelease 1.5
WiMAX System ProfileRelease 1.0 (TDD)
Wave 1 and Wave 2
Air InterfaceProfile
Specifications
WiMAX System ProfileRelease 1.5
(TDD & FDD)
Mobile WiMAX Release 1 Certification (W1 & W2)
IEEE802.16(802.16e-2005 +Cor2
802.16g)
WiMAX NetworkRelease 2.0
IEEE802.16m
WiMAX System ProfileRelease 2.0 (TDD & FDD)
Mobile WiMAX Release 1.5 Certification
Mobile WiMAX Release 2.0 Certification
WiMAX ForumCertification
MAC/PHY Standards
In IEEE
WiMAX Forum
IEEE802.16
2006 2007 2008 2009 2010 20112005
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Worldwide License and License Exempt Band
Note : 700MHz allocated for DTV broadcasting is now considered used by 16e WMAN