wimax
TRANSCRIPT
Worldwide Interoperability for Microwave Access
Prepared by,•Deval Naik•Rohit Kulkarni•Ashley T•Tushar Sharma•Siddharth Sinha•Sanket Kulkarni
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802.16a(Jan 2003)
• Extension for 2-11 GHz• Non-LOS, Point-to-Multi-
Point applications such as “last mile” access & B/H
802.16(Dec 2001)
• Original fixed wireless broadband air Interface for 10 – 66 GHz, Line-of-sight only, Point-to-Point applications
802.16c(2002)
802.16 amendmentfor Line of Sight,
Point to Point backhaul using spectrum
between 10 - 66 GHz
802.16d(Q3 2004)
• Published as 802.16 –2004, replacing earlier revisions
• Fixed & Portable applications 2 – 6 GHz
• HIPERMAN compatibility
802.16e(Q4 2005)
• Mobility to highway speeds in licensed bands from 2-6 GHz
• Roaming within & between service areas
• WiBRO Compatibility
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Improved Performance Much Greater Distances Much Better MAC NLOS Ability (Non line of sight)
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Broadband Internet Access
Voip , IPTV services
Cellular Phones
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IEEE 802.16 (2001) Air Interface for Fixed Broadband Wireless Access System MAC and PHY Specifications for
10 – 66 GHZ (LoS) One PHY: Single Carrier Connection-oriented, TDM/TDMA MAC, QoS, Privacy
IEEE 802.16a (January 2003) Amendment to 802.16, MAC Modifications and Additional PHY Specifications for 2 – 11
GHz (NLoS) Three PHYs: OFDM, OFDMA, Single Carrier Additional MAC functions: OFDM and OFDMA PHY support, Mesh topology support, ARQ
IEEE 802.16d (July 2004) Combines both IEEE 802.16 and 802.16a Some modifications to the MAC and PHY
IEEE 802.16e (2005) Amendment to 802.16-2004 MAC Modifications for limited mobility
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Coverage range up to 50km and speeds up to 70Mbps (shared among users)
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Source: Understanding WiMAX and 3G for Portable/Mobile Broadband Wireless, Technical White Paper, Intel.
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WiMaxFeatures
High Data Rate
All IP –Based
Network Architecture
OFDM based air interface
Deployment flexibility (System Profiles)
QoS
Mobility
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The duplex scheme is Usually specified by regulatory bodies, e.g., FCC
Time-Division Duplex (TDD) Downlink & Uplink time share the same RF channel
Dynamic asymmetry
does not transmit & receive simultaneously (low cost)
Frequency-Division Duplex (FDD) Downlink & Uplink on separate RF channels
Full Duplexing (FDX): can Tx and Rx simultaneously;
Half-duplexing (HDX) SSs supported (low cost)
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frame
Broadcast
Full Duplex Capable User
Half Duplex Terminal #1
Half Duplex Terminal #2
UPLINK
DOWNLINK
DL
MAPUL
MAP
DL
MAPUL
MAP
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WiMax Forum Board Denotation Purpose
SPWG Service provider working group
To influence ongoing standardization
AWG Application working group To uniquely enrich the system application network
NWG Network working group Responsible for everything beyond the PHY and MAC
TWG Technical working group To provide inter operatibilitybetween MS’s/SS’s and BS’s
CWG Certification working group Issues related to certification
RWG Regulatory working group To provide globally spectrum
MWG Marketing working group Promotion of WiMax forum12
ASN V-CSN
BS
BS
H-CSN
DHCP DHCP
IMS orsimilar
IMS orsimilar
PST N
Internet
HA HA
ROUTER ROUTER
AAA AAA
ASN-GW
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Base Station (BS)
Place from where signals are broadcasted
It cover up to 10 Km, it can reach up to 50 Km if geographical area supports
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ASN-GW (ASN Gateway)
Supports connection management
Mobility across cell sites
Inter service provider network boundary through processing of subscriber control and bearer data traffic
Serves as the Extensible Authentication Protocol (EAP), authenticator for subscriber identity and acts as radius client to the operator’s AAA servers
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AAA
Authentication, Authorization, Accounting
Home Network Service Provider (H-NSP)
▪ Provides backbone for ISP, most web users uses to access internet and ISP connects to Internet Exchange
Session accounting for subscriber sessions
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Home Agent
Provides efficient and scalable mechanism for mobility within the network
Provides temporary IP address to visiting client
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Dynamic Host Configuration Protocol (DHCP) Computer networking protocol use by hosts (DHCP
clients) to retrieve IP address assignments and other configuration information
Uses client server architecture▪ Client sends a broadcast request for configuration information
▪ DHCP server receives the request and responds with configuration information from its configuration database
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IP Multimedia Subsystem (IMS) Provides the foundation for developing and
delivering rich multimedia services and applications
Service Delivery Platforms allow you to expose application programming interfaces (APIs) for all network infrastructure components
Aid the access of multimedia and voice application i.e., create a form of fixed mobile convergence
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Available Bandwidth No . Of Subcarriers ∆f T(b)
1.25 MHz 128 10.94 KHz 91.4 µs
3.50 MHz 512 7.81 KHz 128 µs
5.00 MHz 512 10.94 KHz 91.4 µs
7.00 MHz 1024 7.81 KHz 128 µs
8.75 MHz 1024 9.77 KHz 102.4 µs
10.00 MHz 1024 10.94 KHz 91.4 µs
20.00 MHz 2048 10.94 KHZ 91.4 µs
Typically heavily supported bandwidth are 5 MHz, 7MHz and 10 MHz
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Frequency of all the subcarrier of must be an integer multiple of lowest subcarrier frequency
Capable of multi carrier transmission Supports high speed devices still being
bandwidth efficient Adjacent subcarrier must be orthogonal
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3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3
2 2 2 2 2 2 2 2
2 2 2 2 2 2 2 2
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
Time
Subcarrier
Time
Subcarrier
3 3 3 2 3 3 3 3
3 3 3 1 3 3 3 3
2 2 1 2 2 1 2 2
2 1 2 2 1 2 2 3
1 1 2 1 1 1 3 1
1 1 2 2 2 1 1 1
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DlA/Radius
UDP
MS
EAP-XYZ
BS
MAC-CPS
MAC-SS
802.16 Layer-1
Layer-2
IP
DlA/Radius
UDP
Layer-1
Layer-2
IP
ASN-Ctrl
UDP
Layer-1
Layer-2
IP
ASN-Ctrl
UDP
Layer-1
Layer-2
IP
MAC-CPS
MAC-SS
802.16
BS
ASN-GW AAAR1 R3R6
EAP Msgs
ASN-Ctrl
Msgs
MAC-CtrlMsgs
Basic
ClD
Prim Mgmt
ClD
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Each SS has 3 management connections in each direction: Basic Connection:
▪ short and time-urgent MAC management messages
▪ MAC mgmt messages as MAC PDU payloads
Primary Management connection:
▪ longer and more delay tolerant MAC mgmt messages
▪ MAC mgmt messages as MAC PDU payloads
Secondary Management Connection:
▪ Standard based mgmt messages, e.g., DHCP, SNMP, …etc
▪ IP packets based CS PDU as MAC PDU payload
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IP Address Assignment
Simple IP Mobile IP
Proxy MIP
Client MIP
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SSASN-GW(DHCP Relay)
CSN DHCPServer
DHCP DiscoverDHCP Discover
DHCP Offer
DHCP Offer
DHCP RequestDHCP Request
DHCP ACK
DHCP ACK
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Power Consumption
Initial data transfer
Normal mode
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Sleep Mode
Power Consumption
Initial data transfer
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Idle Mode
Power Consumption
Initial data transfer
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WiMaxTraffic classes
UGS RT-VR NRT-VR BE ERT-VR
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UGS
Unsolicitated Grant Service
Fixed rate traffic
You can’t request new more bandwidth once the connection is setup
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RT-VR
Real time variable rate service
Variable rate of traffic allows to change the allocated burst sizes
Rescheduling of bandwidth in any frame is possible
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NRT-VR
Non real time variable rate service
Reservation of some guaranteed rate is mandatory
Delay in sensitive
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BE
Best effort service
Only the maximum data rate is defined
Bandwidth depends on the resources in the cell at a given time
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ERT-VR
Extended real time variable rate service
According to data rate, rescheduling of the bandwidth is possible
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QoSProfile
Unsolicited Grant
IntervalMaximum
Traffic sustain
traffic rate
Maximum latency
Traffic priority
Maximum traffic burst
Unsolicited polling interval
Tolerated Jitter
Minimum reserved
traffic rate
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Handover Types
Hard Handover
Break Before Make
Make Before Break
Soft Handover
RegularFBSS (Fast
BS Switching)
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Authentication
For authentication X.509 certificate at the subscriber station
Privacy and Key Management (PKM) provides service provider authentication
IEEE 802.16e supports the Extensible Authentication Protocol (Optional for service providers)
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Encryption
The AES cipher is available, provides strong support to confidentiality of data traffic
Management frames are not encrypted
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Three potential attacks open to adversaries,
Rogue base station
DoS attacks
Man in middle attacks
Network manipulation with spoofed management frames
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Population: 1.15 Billion people India’s Tele-density
- Overall: 31% Rural: 8.8% Urban: 65% Broadband: 0.4% Internet: 4%
500 Million phone connections byyear 2010
High GDP Growth-8% Increased Income of middle class
(300M) PC Penetration: 2%
The Opportunity in India
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0
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Jan-08 Feb-08 Mar-08 Apr-08 May-08 Jun-08 Jul-08 Aug-08
No
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in M
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Jan 2008 -Aug2008
Growth of Telephone Connections
Wireline Wireless Total
The Opportunity in India-Growth Pattern
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0.230.22
0.19
0.170.16
0.11 0.11 0.11
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0.05 0.050.04
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Deployment in 3.3-3.4 Ghz band only Most of the deployment are of proprietory
technology or 802.16 d version BSNL has already deployed WiMax ‘802.16 d’
version equipment in ten cities VSNL,Reliance and few other operators/ISPs have
also deployed WiMAX systems mainly for enterprise customers
India WiMAX Environment
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WiMAX 802.16 e technology is still
evolving.
High WiMAX CPE cost
Competitive/Alternate technologies-
3G,HSDPA,LTE, EVDO etc
Low PC Penetration
Less-availability of A.C. power in rural
areas
Challenges
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“Future of eMobility”
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