E2-E3 CM CDMA 2000 1X Overview

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WELCOME This is a presentation for the E2-E3 Consumer Mobility Module for the Topic: CDMA 2000 1X Overview Eligibility: Those who have got the Upgradation from E2 to E3. This presentation is last updated on 17-032011.

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CDMA CDMA (code division multiple access) is a mobile digital radio technology that transmits streams of bits and whose channels are divided using codes (PN sequences).

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CDMA2000-1X New Features High speed packet data capabilities; Increased mobile standby battery life; Total backward compatibility to reuse switch and call processing features;

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CDMA2000-1X New Features

Forward link Fast power control IS-95 -- 50Hz (every 20 ms ) IS-2000 -- 800Hz (every 1.25 ms)

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Spectrum Flexibility  Providing full functionality in multiple spectrum bands  Providing more frequency options

uplink: 450 — 457.475(MHz) downlink: 460 — 467.475(MHz) 800M uplink: 824 — 849(MHz) downlink: 869 — 894(MHz) 1900M uplink : 1850 — 1910(MHz) downlink: 1930 — 1990(MHz) 2100M uplink: 1920 — 1980 (MHz) downlink: 2110 — 2170(MHz) 450M

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Evolution of CDMA Networks 

CDMA technology was late entrant into 2G landscape.



Earlier CDMA technology was used in defense establishments as a more secure form of communication.



First deployment of CDMA in commercial cellular systems was in 1994-95 only with IS-95 A as air-interface standard and IS-41 in core network; the complete network known as

cdmaOne. For BSNL internal circulation only

Evolution of CDMA Networks 

Next evolutionary step was use of IS-95B air interface standard which supported maximum data rate up-to 64 kbps to a user.



Further in CDMA 2000 1x version many of the limitations of

earlier IS-95 standard were overcome and new features

were added. 

As a result CDMA 2000 1x has a higher voice capacity and

better handling of packet data services.

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CDMA Evolution

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Subsystems in CDMA 2000 1X • BSS( Base station Subsystem) • MSS( Mobile Switching Sub-system) • OMC( Operation maintenance Center)

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BSS • BTS • BSC

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MSS • • • • • • • •

MSC VLR HLR SC AUC PSTN ISDN SME

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Mobile switch center (MSC) • Performs control and switching to the mobile stations within the area that it serves. • It is responsible for setting up, managing and clearing connections as well as routing the calls to the proper user. • It provides the network interfaces, the charging function and the function of processing the signaling. • MSC get data for call handling from 3 databases: VLR/HLR/AUC

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Visitor location register (VLR) • The VLR also stores necessary information for the establishment of calls in the database for the MSC to search. • Visitor Location Register(VLR) • VLR is a dynamic database used by MSC for information index. It stores all related information of mobile subscribers that enter its coverage area, which enables MSC to set up incoming and outgoing calls. For BSNL internal circulation only

VLR • Subscriber parameters include: subscriber number, location area identity (LAI), user’s status, services which subscriber can use and so on. • When the subscriber leaves this area, it should register in another VLR, and the previous VLR will delete all the data about this subscriber. • VLR can be built together with the MSC or set separately. For BSNL internal circulation only

HLR includes the following two types in information: • Subscription information • Subscriber-related information stored in the HLR

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Subscription information • Some location information that enables he realization of call routing.

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The HLR also contains the following mobile subscriber information:

• • • •

Data services IN services Short message service data Service restriction (such as roaming restriction) • Supplementary service parameters For BSNL internal circulation only

HLR • HLR: It is a static database. When a user apply for mobile service, all data about this subscriber will be stored in HLR. • Information: • ----Subscriber information • ----The mobile subscriber location (MSC/VLR address), so as to set up the call route to the MS. For BSNL internal circulation only

Authentication center (AUC) • It implement mobile subscriber authentication, stores the mobile subscriber authentication parameters, and is able to generate and transmit the corresponding authentication parameters based on the request from MSC/VLR.

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Data stored in AUC • 1. Authentication key (A_KEY); • 2. Share secret data (SSD); • 3. Mobile identification number/international mobile subscriber identity (MIN/IMSI); • 4. Authentication algorithm

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Short message center (MC or SC) • The short message center works in coordination with other entities such as MSC, HLR to implement the reception, storing and transfer of the short messages from CDMA cellular mobile communication system subscribers, and store subscriberrelated short message data.

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Operation and maintenance Center (OMC) • The OMC provides the network operator with network operation and maintenance services, manages the subscriber information and implements network planning, to enhance the overall working efficiency and service quality of the system

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Interfaces Um Interface Abis interface A-interface

B-interface C-interface D-interface E-interface F-interface H-interface M-interface N-interface Q-interface For BSNL internal circulation only

Um Interface • Um interface defines the communication interface between MS and BTS, also called air interface. • • It realizes the compatibility between all kinds of MS and different BTS, so that the MS can roaming.(It is an open interface) • It realizes the physical connection between MS and CDMA network.(that is wireless link). For BSNL internal circulation only

Abis interface

• The interface between BTS and BSC, used for remote connection. • 2.048 Mb/s PCM digital link

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A Interface

• A-interface is an open interface (between MSC and BSC) • This is mainly used to transmit the following information: • 1. BSS management information, • 2. Call processing, and • 3. Mobility management information. For BSNL internal circulation only

B Interface( MSC to VLR) • When the MSC needs the subscriber data of the particular MSC area, the MSC is to inquire the VLR; in the case of mobile station location updating, the MSC will request VLR to store the related information

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C-interface • Interface between the MSC and the HLR.

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D-interface • Interface between VLR and HLR • This interface is used for switching of subscriber location information, authorization information and service data. • The HLR sends the subscriber service data required by the VLR. The switching data usually occurs when a subscriber requests for a special service, or when a subscriber or network operator modifies the subscriber data.

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E- Interface • When a mobile station roams from one MSC to another, the MSC will perform handoff in order to keep the subscribers’ conversation uninterrupted. In this case data switching must be implemented between the MSCs. • Interface between MSC and MSC

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F Interface • When the mobile station is in communication, and the MSC authenticates the mobile station, it has to inquire the EIR, so as to determine whether the mobile station is legal • Interface between MSC and EIR

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H Interface • When the HLR receives an authentication request from an MS, the HLR gets data from the AUC. When the AUC initiates the authentication instruction to the MS, the AUC transfers the authentication information to the subscriber via the HLR. • Interface between HLR and AUC

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M-interface • Interface between MC and SME and MC

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N Interface • When the short message center sends a short message to a subscriber, if the called subscriber’s address information is not available, it has to inquire the HLR for the subscriber’s route before it can send the short message to the subscriber. • Interface between HLR and MC

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Interface between MC and MSC (Q-interface) • During the submission and reception of a short message, short message transfer needs to be conducted between the short message center and mobile switching center. At the same time, when the subscriber’s short message capability changes, the mobile switching center needs to notify the short message center in time. For BSNL internal circulation only

Interface between MSC and OMC • This interface conforms to the network requirements of TMN, and provides standard Q3 interface

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(Ai/Di Interfaces) • The CDMA digital cellular mobile network inter-works with PSTN/ISDN through the mobile switching center (MSC) and provides voice, data and certain supplementary services for subscribers. • Interfaces with PSTN/ISDN

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Features MSS system • High-reliability and high-performance database system • Networking capability - large capacity and flexible configuration • Virtual HLR and SC functions • Powerful service functions

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Architecture of CDMA2000 1X

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What is CDMA2000 1xEV-DO? • 1xEV-DO is a high-performance and costeffective Internet access solution • Capable of up to 2.4 Mbps peak data rate on a 1x (1.25 MHz bandwidth) carrier The Next Enabling Technology for Growth

• Separate 1xEV carrier optimized for Packet Data

Next Generation Performance Today!

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Dual Mode Operation with 1x/EVDO 

As 1xEV-DO supports only data traffic, a total voice and data solution needs integrating cdma2000 1x and 1xEV-DO



Dual mode handset keeps same IMSI any time.



Dual mode handset can simultaneously monitor two systems paging message.



When dual mode handset is in active state under 1xEVDO, it will periodically monitor 1X system paging channel To guarantee not to miss 1X voice call.



Packet data service handoff can happen between 1x and EVDO For BSNL internal circulation only

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