shareef_wireless data services in cdma2000
DESCRIPTION
CDMA channel informationTRANSCRIPT
Introduction
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
Outdoor Mega cells(cells 35km radius) Outdoor macro cells(1-35 km radius) Indoor/outdoor micro cells(1km radius) Indoor/outdoor Pico cells(<50-m radius)
Contd… 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 Common channels with an underlay TIA/EIA-95B
system during transition periods
Contd…
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:
2Mbps for stationary use. 384kbps for pedestrian use. 144kbps for vehicular use.
3G applications enabled by CDMA 2000: Packet based services like, wireless Internet, e-mail,
ecommerceand multimedia, location based services,
longer battery life.
Evolution Of Wireless Technologies
Wireless Technologies1G Analog based cellular
technology Services
Voice2G Digital technologies Services
Voice Low rate data
3G Services
Voice High Speed Data
1St Gen
2G
3G
Evolution Of Wireless Technologies
CDMA 2000 enables migration from and seamless backward compatibility tocdmaOne 2G to 3G without fork-lifting the legacy system.
CDMA 2000 migration path: 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
1xEV-DV Evolution of 1x to provide high data rate and voice
capacity. 5.2Mbps.
CDMA 2000-3X (3xRTT) Conceptual phase. Use of a new 3.75MHz (3 x1.25MHz) spectrum.
CDMA Advantage
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 Max.Data Rate Download timeGSM 9.6Kbps 41 minutesIS95-A CDMA 14.4Kbps 31 minutesGPRS 45Kbps 9 minutesIS95-B CDMA 64Kbps 6 minutesCDMA 2000-1X 307Kbps 1.5 minutesWCDMA 384Kbps 61 secondsCDMA2000 1XEV-DO 2.4Mbps 11 seconds
CDMA 2000 Forward Link
Spreading Rates SR1 (1.2288Mcps) and SR3 (3xRTT).
Nine forward link radio configurations RC1 - RC9.
Each RC is characterized by physical layer parameters such as different modulation and coding.
RC Max. Data Rate Code Rate SR1 9.6kbps 1/2 SR12 14.4kbps 1/2 SR13 153.6kbps 1/4 SR16 307.2kbps 1/6 SR19 1.036Mbps 1/3 SR1
CDMA 2000 Forward Link
New Common Channels: 7 Forward Common Control Channels (F-CCCH)
Signaling and MAC messages. 8 Forward Broadcast Control Channels (F-BCCH)
Paging messages. - 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). 3 Forward Quick Paging Channels (F-QPCH)
Indicator to the mobile to wake up for a message on the paging channel. Useful for conserving battery during idle time.
4 Forward Common Power Control Channels (F-CPCCH) Used to control the reverse access channels.
CDMA 2000 Forward Link
Dedicated Channels: cdmaOne: Forward Fundamental Channel (F-FCH)
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 Strictly for data traffic supporting either RC1 or RC2.
Multiple channel aggregation: 9.6 - 115.2kbps. New Dedicated Channels:
Forward Dedicated Common Control Channel (F-DCCH) High-priority data traffic, such as data re-transmissions.
Up to 2 Forward Supplemental Channels (F-SCH) per user Also only for data, but supports RC3 through RC9.
CDMA 2000 Reverse Link
New Common Channels: Reverse Enhanced Access Channel (REACH). 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 a)In Origination Message, MN requests packet data
service (can also request supplementary services likefax 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). 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.
Contd… IP Mobility
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 Handoff/handover Cell selection/reselection
Core Network IP mobility Mobile IP, GPRS
Cdma2000 Network Architecture
AAA: Authentication, Authorization and Accounting
FA: Foreign Agent GR: Gateway Router HA: Home Agent PDSN: Packet Data Serving
Node
Cdma2000 Layering Structure
Upper Layer Services Voice End User data bearing services Signaling
Lower Layer Link Access Control(LAC) Media Access Control(MAC)
Contd…
LAC manages point to point communication channels MAC provides 3 functions
Media Access control state Best Effort Delivery Multiplexing & QOS control
Cdma2000 Layer Structure Layer functions
Signaling Control Data Services Voice Services Mac Control states Qos Resource Allocation Multiplexing Coding & Modulation
Contd…
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…
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
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 AAA Services of Cdma2000 Networks
Migrate from a “one size fits all” model to personalized services Package premium services for both residential and corporate
users Collect detailed usage information for flexible billing options Track resource usage in real time for guaranteed access and
access control.
AAA consists of three key functions: Authentication – recognize the user Authorization – enforce access controls and deliver services Accounting – track users’ usage of network resources
Vendors Of Cdma2000
cdma2000 (3GPP2) Vendors
Qualcomm Lucent Nortel Motorola Samsung, Ericsson, …
Operators Sprint PCS Verizon , KDDI, SKT…
Conclusion
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
SMS Unified Messaging AAA Services of cdma2000 networks
References
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