PPT-10.Overview of CDMA 2001X

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E1E1--E2 CM E2 CM TECHNICALTECHNICAL

For internal circulation of BSNL only

TECHNICALTECHNICAL

Overview of CDMA 2000 1X & EVDOOverview of CDMA 2000 1X & EVDO


AGENDA

CDMA Network architecture

Introduction to Network entities

Interfaces & Protocols

Channel types & functions


Channel types & functions

CDMA 2000 1X EVDO

1X & 1X EVDO comparison


CDMA Network Architecture

MSCA AiBSCBTS Abis

MS

Um

PSTN

PSPDN

Pi

Di

EIR IWFMSC

F LE


OMC HLR

C

AUC H

Q Q

D VLR

B

VLR

G

SC

N

SCSMESME M M M

ISDN

Di


Introduction to Network Entities

BSS

BSS consists of one or more BSCs and BTSs

.


BTS is responsible for radio transmission

BSC for control and management.


Base Transceiver

Radio transceiving equipment of a certain cell

Radio transmission through air interface between

BTS and MS

Controlled by BSC


Communication to BSC through the Abis interface


Base Station Controller

Radio network management

Radio BTS monitoring and management

Controls handoff

Carries out operation and maintenance of the BSS.



Mobile Switching Subsystem

Implements the main switching functions of the

CDMA network

Manages the database for user data and mobility.



Mobile Switching Center

Controls and implements voice channel connection

for MSs within its coverage area

Serving as an interface between CDMA and other

networks.



Functions of MSC

Call connection

Charging

Assist radio resource management and mobility

management.


Implements GMSC function for call route

establishment to the MS

To query the location information of each MS.


MSC databases

Visitor Location Register

Home Location Register

Authentication Center



Visitor Location Register

A dynamic user database

Stores user data of all MSs (visitors) within the MSCs

management range

User ID

MSs location area information


User status

Services available for the user.

VLR gets and stores all necessary data from the HLR of

a mobile subscriber.


Home Location Register

A static database

Stores the data for mobile subscriber management

Parameters related with the mobile subscriber

Subscribers ID

User type


User type

Supplementary services

Current location information of the subscriber for call

route establishment.

ex: Address of MSC or VLR


Authentication Center

Implements MS authentication

Stores the MS authentication parameters

Generates and sends the corresponding

authentication parameters according to the requests

of MSC or VLR


of MSC or VLR


Short Message Center

Responsible for receiving, storing and forwarding

short messages

Short message services include

Point-to-point


Cell broadcast service.


Operation and Maintenance

Management Subsystem

Provides network operation and maintenance

services

Manages subscriber information

Makes network planning

Improves the efficiency and service quality of the


Improves the efficiency and service quality of the

whole system.


OMC

Includes OMC-S and OMC-R

OMC-S is responsible for the maintenance on the

MSS side

OMC-R is responsible for the maintenance on the

BSS side.


BSS side.


Functions of OMC

Maintenance test

Obstacle check and handling

System status monitoring

Real time system control

Data modification


Data modification

Performance management

Subscriber tracking

Alarm and traffic measurement.


Interfaces and Protocols

Air interface

Um interface

Between mobile station and BSS

A interface - Interface between BSS and MSS

Abis interface -Interface between BSC and BTS


Abis interface -Interface between BSC and BTS


MSS internal interfaces

MSC

B

HLR/AUC

BSS

D

BSC

VLR

CBTS A


B

VLR

MSCMC

E

N

Q


E interface

Interface controlling different MSCs of adjacent

areas.

Used to exchange handoff information when the MS

moves during a call

Physical link is implemented through 2.048Mbit/s


Physical link is implemented through 2.048Mbit/s

standard digital link between MSCs.


CDMA 2000 1x air interface

Forward Channels

Reverse Channels



Forward Channels

Forward pilot channel (F_PICH)

Base station uses this channel to transmit the pilot

signals

Guide the mobile stations to access the network.

Forward sync channel (F-SYNCH)


Forward sync channel (F-SYNCH)

System time and frame synchronization

information are sent to MS


Forward Channels

Forward paging channel (F-PCH)

Paging, command and traffic channel allocation

information

Forward quick paging channel (F-QPCH)

Base station quickly instruct MS about time slot to


Base station quickly instruct MS about time slot to

receive the control message on F-PCH or F-

CCCH.

MS need not to monitor F-PCH or F-CCCH time

slot all the time, so it saves much battery.


Forward Channels

Forward broadcast control channel (F-BCCH)

For delivering system messages.

Common assignment channel (F-CACH)

Base station instructs MS which R-CCCH to use to

send the access message


send the access message

And from which F-CPCCH channel to receive

power control bit.


Forward Channels

Forward common power control channel (F-CPCCH)

Base station transmits reverse power control bit

Forward common control channel (F-CCCH)

To exchange control messages

Used when MS has not set up a traffic channel


Used when MS has not set up a traffic channel


Forward Channels

Forward dedicated control channel (F-DCCH)

Used by base station to transmit messages when

the mobile station is in traffic channel state

Forward fundamental traffic channel (F-FCH)

Used to carry signaling, voice, low-rate packet


Used to carry signaling, voice, low-rate packet

service, circuit data services or auxiliary service


Forward Channels

Forward supplemental channel (F-SCH)

Used to carry high-rate packet data service on the

forward link when MS enters traffic channel state.

Forward supplemental code channel (F-SCCH)


Used for data transfer.

Forward power control sub-channel (F-PCSCH)

Transmits persistently on the forward traffic

channel.

Used for reverse power control.


Reverse Channels

Reverse pilot channel (R_PICH)

Used to assist the base station to detect the data

transmitted by MS.

Reverse access channel (R-ACH)

Functions are same as the IS-95A reverse access


Functions are same as the IS-95A reverse access

channel.

Reverse common control channel (R-CCCH)

Used by base station and MS

To exchange control messages when the mobile

station has not set up a traffic channel yet.


Reverse Channels

Reverse enhanced access channel (R-EACH)

MS sends control messages to base station when

it has not yet set up a traffic channel

Reverse dedicated control channel (R-DCCH)


Reverse dedicated control channel (R-DCCH)

Used to transmit messages when the mobile

station is in traffic channel state


Reverse Channels

Reverse fundamental channel (R-FCH)

Used to carry signaling, voice, low-rate packet and

circuit data services, or auxiliary services on the

reverse link when the mobile station enters traffic

channel state.


channel state.

Reverse supplemental channel (R-SCH)

Used to carry high-rate packet data service


Reverse Channels

Reverse supplemental code channel (R-SCCH)

Used to send user information to the base station

during a call.

Reverse power control sub-channel (R-PCSCH)

Sub-channel of reverse pilot channel


Sub-channel of reverse pilot channel

Includes reverse main power control sub-channel

and reverse auxiliary power control sub-channel.

Used for forward power control.


CDMA2000 1x EV-DO

Evolution Data Optimized or Evolution Data Only

Specification : IS-856.

1x EV-DO system structure involves a new radio

network part overlaying the 1x system.


Highest data transmission up to 3.1 Mb/s.


Forward Channels features

Data rates range from 38.4 Kb/s ~ 3.1 Mb/s.

Transmit full power without any power control.

All users belonging to the same service sector share

unique data service channel in the TDMA mode.


unique data service channel in the TDMA mode.


Reverse Channels features

Data rate can reach at most 307.2 Kb/s.

Soft handoff.

Reverse channels follow Dynamic power control.

Use of Rate control enables reverse link load


Use of Rate control enables reverse link load

adjustment.


1 X vs EV DO

1x system

Provides voice services and low/medium-speed

data services

1x EV-DO system


1x EV-DO system

Provides high-speed packet data services

1x EV-DO and 1x systems use different carriers to

transfer data.

1x EV-DO system RF equipment is compatible with

1x system.


1x and 1x EV-DO Comparisons


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PPT-10.Overview of CDMA 2001X

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