Download - Chapter 09.Overview of CDMA 2001X

8/9/2019 Chapter 09.Overview of CDMA 2001X

1/37

E1E1--E2 CME2 CMTECHNICALTECHNICAL

For internal circulation of BSNL only

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


2/37

AGENDA

CDMA Network architecture

Introduction to Network entities

Interfaces & Protocols


anne ypes unc onsCDMA 2000 1X EVDO

1X & 1X EVDO comparison


3/37

CDMA Network Architecture

MS CA AiBSCBTS Abis

MS

Um

PSTN

PSPDN

Pi

EIR IWFMS C

F LE


OMC HLR

C

AUC H

Q Q

D VLR

B

VLR

G

SC

N

SCSM ESME M M M

ISDN


4/37


5/37

Base Transceiver

Radio transceiving equipment of a certain cell

Radio transmission through air interface betweenBTS and MS

Controlled by BSC


Communication to BSC through the Abis interface


6/37

Base Station Controller

Radio network management

Radio BTS monitoring and management

Controls handoff

Carries out operation and maintenance of the BSS.



7/37

Mobile Switching Subsystem

Implements the main switching functions of the

CDMA networkManages the database for user data and mobility.



8/37

Mobile Switching Center

Controls and implements voice channel connection

for MSs within its coverage areaServing as an interface between CDMA and other

networks.



9/37

Functions of MSC

Call connection

ChargingAssist radio resource management and mobility

management.


Implements GMSC function for call routeestablishment to the MS

To query the location information of each MS.


10/37

MSC databases

Visitor Location Register

Home Location RegisterAuthentication Center



11/37

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 statusServices available for the user.

VLR gets and stores all necessary data from the HLR of

a mobile subscriber.


12/37

Home Location Register

A static database

Stores the data for mobile subscriber management

Parameters related with the mobile subscriber

Subscribers ID


Supplementary services

Current location information of the subscriber for call

route establishment.

ex: Address of MSC or VLR


13/37

Authentication Center

Implements MS authentication

Stores the MS authentication parametersGenerates and sends the corresponding

authentication parameters according to the requests


of MSC or VLR


14/37

Short Message Center

Responsible for receiving, storing and forwarding

short messagesShort message services include

Point-to-point


Cell broadcast service.


15/37


16/37

OMC

Includes OMC-S and OMC-R

OMC-S is responsible for the maintenance on theMSS side

OMC-R is responsible for the maintenance on the


BSS side.


17/37


18/37

Interfaces and Protocols

Air interface

Um interfaceBetween mobile station and BSS

A interface - Interface between BSS and MSS


Abis interface -Interface between BSC and BTS


19/37

MSS internal interfaces

MSC

B

HLR/AUC

BSS

D

BSC

VLR

CBTS A


B

VLR

MSC

MC

E

N

Q


20/37

E interface

Interface controlling different MSCs of adjacent

areas.

Used to exchange handoff information when the MS

moves during a call


.

standard digital link between MSCs.


21/37

CDMA 2000 1x air interface

Forward Channels

Reverse Channels



22/37

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.


-

System time and frame synchronization

information are sent to MS


23/37

Forward Channels

Forward paging channel (F-PCH)

Paging, command and traffic channel allocation

information

Forward quick paging channel (F-QPCH)

Base station uickl 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.


24/37

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


And from which F-CPCCH channel to receive

power control bit.


25/37

Forward Channels

Forward common power control channel (F-CPCCH)

Base station transmits reverse power control bitForward common control channel (F-CCCH)

To exchange control messages


Used when MS has not set up a traffic channel


26/37

Forward Channels

Forward dedicated control channel (F-DCCH)

Used by base station to transmit messages whenthe mobile station is in traffic channel state

Forward fundamental traffic channel (F-FCH)


Used to carry signaling, voice, low-rate packet

service, circuit data services or auxiliary service


27/37

Forward Channels

Forward supplemental channel (F-SCH)

Used to carry high-rate packet data service on theforward 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.


28/37

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)

-


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.


29/37

Reverse Channels

Reverse enhanced access channel (R-EACH)

MS sends control messages to base station whenit has not yet set up a traffic channel

Reverse dedicated control channel (R-DCCH)


Used to transmit messages when the mobilestation is in traffic channel state


30/37

Reverse Channels

Reverse fundamental channel (R-FCH)

Used to carry signaling, voice, low-rate packet andcircuit data services, or auxiliary services on the

reverse link when the mobile station enters traffic


channel state.

Reverse supplemental channel (R-SCH)

Used to carry high-rate packet data service


31/37

Reverse Channels

Reverse supplemental code channel (R-SCCH)

Used to send user information to the base stationduring a call.

Reverse power control sub-channel (R-PCSCH)


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.


32/37


33/37

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.



34/37

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


adjustment.


35/37

1 X vs EV DO

1x system

Provides voice services and low/medium-speeddata services

1x EV-DO system


Provides high-speed packet data services1x EV-DO and 1x systems use different carriers to

transfer data.

1x EV-DO system RF equipment is compatible with1x system.


36/37

1x and 1x EV-DO Comparisons



37/37
