Transcript Shareef_Wireless Data Services In Cdma2000

Wireless Data Services In Cdma2000
By
Mohammed Yousuf Shareef
St Id#220326
Introduction
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Cdma-Code Division Multiple Access.
Spread Spectrum technique using Direct Sequence i.e. each data
bit is represented (spread) by multiple bits in transmitted signal.
Cdma2000-multi carrier mode Cdma
It supports data rates both circuit and packet switched of 9.6kbps
to 2 Mbps.
Operates in wide range of environments
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Outdoor Mega cells(cells 35km radius)
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Outdoor macro cells(1-35 km radius)
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Indoor/outdoor micro cells(1km radius)
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Indoor/outdoor Pico cells(<50-m radius)
Contd…
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Cdma2000 can be deployed in
 Indoor/Outdoor environment
 Wireless Local Loops
 Vehicular Environments
 Mixed Vehicular & Indoor/Outdoor Environments
Cdma2000 services support
 Overlay configuration
 Backward compatibility to TIA/EIA-95B signaling & network
 Graceful & gradual upgrade from 2G to 3 G systems
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Common channels with an underlay TIA/EIA-95B system
during transition periods
Contd…
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CDMA 2000 is a radio and network access system that is part of the
IMT-2000 (ITU) specification suite of 3G systems.
Goals of IMT-2000:Global Standard.
High Speed Packet Data Services:
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2Mbps for stationary use.
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384kbps for pedestrian use.
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144kbps for vehicular use.
3G applications enabled by CDMA 2000:
Packet based services like, wireless Internet, e-mail, ecommerce
and multimedia, location based services,
longer battery life.
Evolution Of Wireless Technologies
1G
Wireless Technologies
1St Gen
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Analog based cellular
technology
Services
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Voice
2G
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2G
3G
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Digital technologies
Services
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Voice
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Low rate data
3G
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Services
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Voice
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High Speed Data
Evolution Of Wireless Technologies
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CDMA 2000 enables migration from and seamless backward
compatibility to
cdmaOne 2G to 3G without fork-lifting the legacy system.
CDMA 2000 migration path:
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CDMA 2000-1X (1xRTT)
 Currently available. Incorrectly considered 2.5G.
 First version of CDMA 2000 by Qualcomm.
 144kbps data rate and 1.5 times the voice capacity.
1xEV-DO (HDR)
 Evolution of 1x to provide high data rate only, over a separate
carrier.
 2.4Mbps downstream and 300kbps upstream.
Evolution Of Wireless Technologies
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1xEV-DV
 Evolution of 1x to provide high data rate and voice capacity.
 5.2Mbps.
CDMA 2000-3X (3xRTT)
 Conceptual phase.
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Use of a new 3.75MHz (3 x1.25MHz) spectrum.
CDMA Advantage
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GSM is discrete with no forward and backward compatibility
CDMA terminals are fully forward and backward compatible.
Approximate Download time for 3 minute mp3
Network
GSM
IS95-A CDMA
GPRS
IS95-B CDMA
CDMA 2000-1X
WCDMA
CDMA2000 1XEV-DO
Max.Data Rate
9.6Kbps
14.4Kbps
45Kbps
64Kbps
307Kbps
384Kbps
2.4Mbps
Download time
41 minutes
31 minutes
9 minutes
6 minutes
1.5 minutes
61 seconds
11 seconds
CDMA 2000 Forward Link
CDMA 2000 Forward Link
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Spreading Rates
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SR1 (1.2288Mcps) and SR3 (3xRTT).
Nine forward link radio configurations
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RC1 - RC9.
Each RC is characterized by physical layer parameters such as different
modulation and coding.
RC
Max. Data Rate
Code Rate
SR
1
9.6kbps
1/2
SR1
2
14.4kbps
1/2
SR1
3
153.6kbps
1/4
SR1
6
307.2kbps
1/6
SR1
9
1.036Mbps
1/3
SR1
CDMA 2000 Forward Link
New Common Channels:
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7 Forward Common Control Channels (F-CCCH)
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Signaling and MAC messages.
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8 Forward Broadcast Control Channels (F-BCCH)
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Paging messages.
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- Specifically for CDMA2000 mobiles to reduce load on
cdmaOne channels.
 Forward Common Auxiliary Pilot Channel (F-CAICH)
 Used to generate spot beams in a particular area (hot spot).
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3 Forward Quick Paging Channels (F-QPCH)
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Indicator to the mobile to wake up for a message on the paging
channel. Useful for conserving battery during idle time.
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4 Forward Common Power Control Channels (F-CPCCH)
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Used to control the reverse access channels.
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CDMA 2000 Forward Link
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Dedicated Channels:
cdmaOne: Forward Fundamental Channel (F-FCH)
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Primarily for voice, but may carry data up to 14.4kbps.
IS-95B (2.5G): Up to 7 Forward Supplemental Code Channels (F-SCCH)
per user
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Strictly for data traffic supporting either RC1 or RC2.
Multiple channel aggregation: 9.6 - 115.2kbps.
New Dedicated Channels:
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Forward Dedicated Common Control Channel (F-DCCH)
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High-priority data traffic, such as data re-transmissions.
Up to 2 Forward Supplemental Channels (F-SCH) per user
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Also only for data, but supports RC3 through RC9.
CDMA 2000 Reverse Link
CDMA 2000 Reverse Link
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New Common Channels:
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Reverse Enhanced Access Channel (REACH).
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Reverse Common Control Channel (RCCCH).
Used to provide more reliable and
power efficient access.
Dedicated Channels:
cdmaOne: Reverse Fundamental Channel (R-FCH).
IS-95B (2.5G): Up to 7 Reverse Supplemental Code Channels (R-SCCH)
per user.
New Dedicated Channels:
 Reverse Dedicated Control Channel (R-DCCH).
 Up to 2 Reverse Supplemental Channels (R-SCH) per user.
Reverse Pilot Channel (R-PICH)
 Improves reception at the receiver.
 Power control bits multiplexed (at 800Hz) for forward link power
control.
Packet Data Call
Packet Data Call
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a)In Origination Message, MN requests packet data
service (can also request supplementary services like
fax over circuit.)
b) BSC acknowledges.
c) BSC sends Service Request message to MSC.
d) After authentication, MSC sends channel Assignment Request
message.
e) Forward and Reverse channel assignment procedures
(same as (e) thru (j)).
f) A9-Setup-A8 message to PCF to establish A8
connection.
g) Procedure for establishing A10/A11 connection between
PCF and PDSN (R-P interface).
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h) PCF transmits A9-Connect-A8 message to BSC.
i) BSC transmits Assignment Complete message to MSC.
j) PPP connection establishment procedure and Mobile IP
registration procedure initiated.
3G Network Architecture
Contd…
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IP Mobility
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Ability to move with an IP address while the connection using the
IP address is active
IP Mobility may be provided by a combination of “RAN mobility” and
“CN mobility”
Radio Access Network IP mobility
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Handoff/handover
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Cell selection/reselection
Core Network IP mobility
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Mobile IP, GPRS
Cdma2000 Network Architecture
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AAA: Authentication,
Authorization and Accounting
FA: Foreign Agent
GR: Gateway Router
HA: Home Agent
PDSN: Packet Data Serving
Node
Cdma2000 packet Data Network
Architecture
Cdma2000 Layering Structure
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Upper Layer Services
 Voice
 End User data bearing services
 Signaling
Lower Layer
 Link Access Control(LAC)
 Media Access Control(MAC)
Contd…
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LAC manages point to point communication channels
MAC provides 3 functions
 Media Access control state
 Best Effort Delivery
 Multiplexing & QOS control
Cdma2000 Layer Structure
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Layer functions
 Signaling Control
 Data Services
 Voice Services
 Mac Control states
 Qos
 Resource Allocation
 Multiplexing
 Coding & Modulation
Packet Data Mac Operation States in
Cdma2000 &TIA/EIA-95B
Contd…
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Active State
 Traffic,PC and control channels assigned
Control Hold State
 PC and Control channels assigned
 Very fast traffic channel reassignment
Suspended State
 No Dedicated Channels
 Fast traffic Channel
 Reassignment
 RLP state may be maintained
 PPP state maintained
 Slotted sub mode
Contd…
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Dormant State
 No dedicated channels
 No BS,MSC resources
 PPP state maintained
 Short data bursts
Channel Bandwidths and Data rates
supported by Cdma2000
RF Bandwidth(MHz)
Forward data rates(kb/s)
Reverse data
rates(kb/s)
1.25
1.2-307.2
1.2-307.2
3.75
1.2-1036.8
1.2-1036.8
7.5
1.2-2073.6
1.2-2073.6
11.25
1.2-2457.6
1.2-2073.6
15
1.2-2457.6
1.2-2073.6
Services Of CDMA2000 Networks
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Short Message Services (SMS)
 low cost/high value services
 increased network traffic
 higher profits and greater customer loyalty
 Message Over IP-SMS
 Over-the-Air Services
 E-Mail Distribution
Unified Messaging:
 The end-user can send, retrieve and manage e-mail, voice
mail and fax mail with one subscription, to one service,
provided by one operator.
AAA Services cdma2000 networks
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AAA Services of Cdma2000 Networks
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Migrate from a “one size fits all” model to personalized services
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Package premium services for both residential and corporate users
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Collect detailed usage information for flexible billing options
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Track resource usage in real time for guaranteed access and access
control.
AAA consists of three key functions:
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Authentication
– recognize the user
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Authorization
– enforce access controls and deliver services
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Accounting
– track users’ usage of network resources
Vendors Of Cdma2000
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cdma2000 (3GPP2)
Vendors
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Qualcomm
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Lucent
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Nortel
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Motorola
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Samsung, Ericsson, …
Operators
 Sprint PCS
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Verizon , KDDI, SKT…
Conclusion
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A brief overview of wireless data services has been presented
New Channels Of Forward and Reverse channel specifications of
cdma2000 is shown.
Network Architecture Of Cdma2000 has presented
Various wireless data services like
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SMS
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Unified Messaging
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AAA Services of cdma2000 networks
References
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Wireless Network evolution by Vijay K.Garg.
“cdma2000:A Third generation radio transmission
technology”,Bell Labs technical Journal ,sept.1998.
TIA/EIA IS-2000-3 “Medium Access Control Standard for
cdma2000 Spread Spectrum Systems,”Nov.1999.
Douglas N.Kinsley, Sarath Kumar, Subhasis Laha, and Sanjiv
Nanda,”Evolution Of Wireless Data Services IS-95 to cdma2000”
Technology Primer AAA Services for Cdma2000 Networks,
Bridge Water Systems