1.1Main service functions

CDMA cellular mobile communication system can provide the following services:1. Telecom services,2. Data services,3. Supplementary services,4. Short message service, and5. IN serviced.

1.2Networking of CDMA cellular mobile communication system

1.2.1Networking diagram of CDMA cellular mobile communication system

The schematic diagram of the CDMA cellular mobile communication system is shown in

Fig. 1-5.

Um

E

Abis

A

Q

C

B

N

G

N

MS

BTS

BSC

PSTN

ISDN

PSPDN

MSC

SCP

MSC/SSP

VLR

HLR

AUC

SC

VLR

D

SC

SMEM

M

SME

M

Fig. 1-5 Schematic diagram of CDMA cellular mobile communication system

The description is given is Table 1-1.

Table 1-1 Abbreviations descriptions

Abbreviations

English means

MSC

Mobile Switch Center

VLR

Visitor Location Register

HLR

Home Location Register

SC

Short Message center

SSP

Service switch point

AUC

Authentication Center

PSTN

Public Switched Telephone Network

ISDN

Integrated Service Digital Network

PSPDN

Packet Switched Public Data Network

SME

Short Message Entity

BTS

Base Transceiver Station

BSC

Base Station Controller

BS

Base Station

MS

Mobile Station

1.2.2 Network entity description

Base station subsystem (BSS)

Base station subsystem is the general term for the wireless devices and wireless channel control devices that serve one or several cells. Generally, a BSS contains one more base station controllers (BSC) and base transmitter stations (BTS).

1.4.2.2 Mobile switch center (MSC)

MSC is a functional entity that performs control and switching to the mobile stations within the area that it serves, and an automatic connecting device for the subscriber traffic between the CDMA network and other public networks or other MSCs. MSC is the kernel of the CDMA cellular mobile communication system, and it is different from a wired switch in that an MSC must consider the allocation of the wireless resources and the mobility of subscribers, and at least it must implement the follows processing activities:

1. Location Registration processing;

2. Handoff.

1.4.2.3 Gateway MSC (GMSC)

When a non-CDMA subscriber calls a CDMA subscriber, the call will first be routed to an MSC, which will inquires the corresponding HLR and further route the call to the called party’s MSC. This kind of MSC is called Gateway MSC (GMSC). It is up to the network operator to select which MSCs as GMSCs.

1.4.2.4 Visitor location register (VLR)

VLR is responsible for the storage and updating of the subscriber data of mobile stations that roamed to the service area of this VLR. The VLR is generally configured together with the MSC. When the mobile station enters a new location area, the MSC will notice the VLR, which will initiate registration processing to the HLR to update the subscriber location information. The VLR also stores necessary information for the establishment of calls in the database for the MSC to search. One VLR can cover one or more MSC areas. Specifically, the following information is included:

Service profile information (PROFILE)

Mobile identification number/international mobile subscriber identity

(MIN/IMSI)

Shared secret data

SSDElectronic serial number (ESN)

Mobile station authentication data (AUTHEN)Mobile station authorization data (AUTHOR)

Mobile station temporary local directory number (TLDN)

Mobile station location area information (LAI)

1.4.2.5 Home location register (HLR)

The HLR provides subscriber information storage and management functions for the mobile network, including mobile subscriber subscription and cancellation and service authorization and cancellation. At the same time, it helps in the implementation of subscriber’s call and service operations. A CDMA can contain one or more HLRs based on the number of subscribers, equipment capacity and network organization mode, with multi-HLR mode realized in the form of virtual HLRs. The subscriber information stored in the HLR includes the following two types in information:

1. Subscription information

Some location information that enables the realization of call routing and accounting,

such as VLR address, MSC address and local mobile station identity.2. Subscriber-related information stored in the HLRMainly including:Service profile information (PROFILE)Mobile identification number/international mobile subscriber identity (MIN/IMSI)Shared secret data

SSDElectronic serial number (ESN)Mobile directory number (MDN)IMSI/MIN and MDN are often used as key for access to the mobile subscriber database.

The HLR also contains the following mobile subscriber information:Telecom servicesData servicesIN servicesShort message service dataService restriction (such as roaming restriction)Supplementary service parameters

1.4.2.6 Authentication center (AUC)

Authentication center is a function entity for the management of authentication information related to the mobile station. 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. The authentication parameters in the AUC can be stored in the encrypted form. The authentication center is generally configured together with the HLR. The authentication parameter stored in the AUC include:

1. Authentication key (A_KEY);

2. Share secret data (SSD);3. Mobile identification number/international mobile subscriber identity (MIN/IMSI);4. Authentication algorithm (AAV);

5. Accounting (COUNT).

1.4.2.7 Short message center (MC or SC)

As an independent entity in the CDMA cellular mobile communication system, 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 subscriber-related short message data.

1.4.2.8 Short message entity (SME)

SME is a function entity for synthesis and analysis of short messages.

1.4.2.9 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. Based on the main maintenance functions, there two type of operation and maintenance centers: OMC- S and OMC-R. An OMC-S is mainly used for the maintenance work at the mobile switching subsystem (MSS) side; an OMC-R is mainly used for the maintenance work at the base station subsystem (BSS) side. Of course, for an operation and maintenance system, these two parts are not strictly distinguished from each other. In fact, from the approach of the whole system, the entire CDMA mobile communication system (including MSC/VLR, HLR/AUC, SC, BSC, BTS etc.) should be controlled by a highly efficient operation and maintenance system.

1.2.3Descriptions of inter-entity interfaces

1.4.3.1 Interface between MSC and BSS (A-interface)

In fact, it is the interface between MSC and BSC. Adopting 2Mb/s PCM digital link, the

standard protocols for this interface include IS-634, IOS2.4, IOS4.0 etc.

A-interface is mainly used to transmit the following information:1. BSS management information,2. Call processing, and3. Mobility management information.

1.4.3.2 Interface between MSC and VLR (B-interface)

This interface is an internal interface, without standard definition. Its functions are as

follows:

VLR is the location and management database for subscribers that have roamed into related MSC area. 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; when the user activates the supplementary services or modifies data, the MSC will request the HLR (through VLR) to store the related data.

This interface has no standard definition, and generally uses an internal interface.

1.4.3.3 Interface between MSC and HLR (C-interface)

Interface between the MSC and the HLR.

The system adopts the IS-41E protocol. This interface is based on 2Mb/s digital interface or 64Kb/s interface, with its interface electrical performance conforming to GF002- 9002.1 The General Technical Specifications for Telephone Switching Equipment of the

Ministry of Posts and Telecommunications Volume 1 Digital SPC Switching Equipment General Technical Specifications Chapter 7 and GB7611-87 Pulse Coding Modulation Communication System Network Digital Interface Parameters; As for the signaling

specifications, for detailed description of MAP, refer to Technical Requirements for

800MHz CDMA Digital Cellular Mobile Communication Network Mobile Application Part (MAP); for detailed description of SCCP, refer to GF010-95 Technical Requirements for National No.7 Signaling Mode Technical Specifications Signaling Connection Control Part (SCCP); for detailed description of MTP, refer to GF001-9001 China Telephone Network No.7 Signaling Mode Technical Specifications.

C-interface adopts 24-bit No.7 signaling mode.

1.4.3.4 Interface between VLR and HLR (D-interface)

The system adopts the IS-41E protocol. This interface is based on 2Mb/s digital interface or 64Kb/s interface , with its interface electrical performance conforming to GF002- 9002.1 The General Technical Specifications for Telephone Switching Equipment of the

Ministry of Posts and Telecommunications Volume 1 Digital SPC Switching Equipment General Technical Specifications Chapter 7 and GB7611-87 Pulse Coding Modulation Communication System Network Digital Interface Parameters; As for the signaling

specifications, for detailed description of MAP, refer to Technical Requirements for

800MHz CDMA Digital Cellular Mobile Communication Network Mobile Application Part (MAP); for detailed description of SCCP, refer to GF010-95 Technical Requirements for National No.7 Signaling Mode Technical Specifications Signaling Connection Control Part (SCCP); for detailed description of MTP, refer to GF001-9001 China Telephone Network No.7 Signaling Mode Technical Specifications.

D-interface uses 24-bit No.7 signaling mode.

This interface is used for switching of subscriber location information, authorization information and service data. The major service function of a mobile station is: it must have the capability of initiating and receiving calls within the service area. In order to support this capability, the HLR has to perform data switching. The VLR notifies the HLR about the subscriber location information, and provides the subscriber roaming number. 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.

1.4.3.5 Interface between MSC and MSC (E-interface)

The system adopts the IS-41E protocol. This interface is based on 2Mb/s digital interface or 64Kb/s interface, with its interface electrical performance conforming to GF002- 9002.1 The General Technical Specifications for Telephone Switching Equipment of the

Ministry of Posts and Telecommunications Volume 1 Digital SPC Switching Equipment General Technical Specifications Chapter 7 and GB7611-87 Pulse Coding Modulation Communication System Network Digital Interface Parameters; as for the signaling

specifications, for detailed description of MAP, refer to Technical Requirements for

800MHz CDMA Digital Cellular Mobile Communication Network Mobile Application

Part (MAP); for detailed description of SCCP, refer to GF010-95 Technical Requirements for National No.7 Signaling Mode Technical Specifications Signaling Connection Control Part (SCCP); for detailed description of MTP, refer to GF001-9001 China Telephone Network No.7 Signaling Mode Technical Specifications.; the ISUP part is still

to be defined.E-interface adopts the 24bit No.7 signaling mode. Its functions are as follows:When a mobile station roams from one MSC to another, the MSC will perform handoff inorder to keep the subscribers’ conversation uninterrupted. In this case data switching mustbe implemented between the MSCs.

1.4.3.6 Interface between MSC and EIR (F-interface)

This interface has no standard definition. Its functions are as follows:

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, and thus deciding whether to provide services to this mobile station.

1.4.3.7 Interface between HLR and AUC (H-interface)

Currently an internal interface is used. Its functions are as follows:

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.

1.4.3.8 Interface between MC and SME and MC (M-interface)

Current the SMPP phase III standard is used. The interface’s function is as follows:

When the short message center performs information interaction with the short message

entity and another short message center, this protocol must be abided by.

1.4.3.9 Interface between HLR and MC (N-interface)

The interface standard is ANSI-41E. Its function is as follows:

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.

1.4.3.10 Interface between MC and MSC (Q-interface)

The interface standard is ANSI-41E. Its function is as follows:

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.

1.4.3.11 Interface between MSC and OMC

This interface conforms to the network requirements of TMN, and provides standard Q3

interface to the upper-level TMN.

1.4.3.12 Interfaces with PSTN/ISDN (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. Its interfaces

are 2048kb/s-based digital interfaces. TUP and ISUP of the SS7 signaling are adopted with priority as the interface signaling specifications. Where conditions are not available, China No.1 signaling can be used.

1.4.3.13 Interfaces with Other PLMN Networks

The CDMA digital mobile network is normally connected with different types of PLMN networks (such as GSM) through other public networks (such as PSTN and ISDN), or directly connected with other types of PLMN networks. The adopted protocol can be TUP or ISUP, or China No.1 signaling.

1.4.3.14 Interfaces with PSPDN

The high-layer interface protocol is the IS-658 protocol, and the bottom layer adopts the X.25 or TCP/IP protocol. This interface is based on 2Mb/s digital interface or 64Kb/s interface , with its interface electrical performance conforming to GF002-9002.1The

General Technical Specifications for Telephone Switching Equipment of the Ministry of Posts and Telecommunications Volume 1 Digital SPC Switching Equipment General Technical Specifications Chapter 7 and GB7611-87 Pulse Coding Modulation Communication System Network Digital Interface Parameters; for the details of signaling

specifications, refer to The Technical Requirements for Interface between CDMA Digital

Cellular Mobile Communication Network MSC and PSTN network.

1.3Features MSS system

1. Supporting the CDMA IS 95A/B function, and compatible with the CDMA2000 1X

system;

2. Combining the advantages of domestic and foreign-made mobile switching systems, the system’s hardware structure, software system and overall technology are all in the leading position;

3. On the hardware design, ultra scale integrated circuits are adopted to cut down on the number of stand-along components. This greatly enhances the system’s reliability and reduces the power consumption;

4. Carried out strictly conforming to the software engineering requirements, the software programming adopts from-the-top-down, layered and modularized design principle, so that the software system is easy for maintenance and expansion.

1.3.1 Open signaling interface

MSS is a CDMA mobile communication system developed on the basis of the large-scale digital SPC switch. It provides externally the MAP protocol interface based on No.7 signaling, which fully conforms to the ANSI-41E specifications. The CDMA mobile communication system MSS system links with other entities in the network through the standard MAP signaling. Every independent entity of the CDMA

mobile communication system MSS can be connected with devices of other manufacturers as an individual product.

1.3.2 High-reliability and high-performance database system

The database system of the CDMA mobile communication system MSS adopts the advanced cluster technology. High-speed data links are used for the connection between dual machines, and the disk array supports large-capacity database access.

Microsoft Windows NT operating system is used as the software platform, together with the powerful commercial database management function of MS SQL Server, ensuring the safety and reliability of real-time data access.

1.3.3 Networking capability - large capacity and flexible configuration

1. Series products provided, namely MSC, VLR, HLR, AUC, SC, VM, SSP, TMSC2 and LSTP can be integrated together, and some of them can be independently configured, with open interfaces provided;

2. The system has excellent inter-network inter-working function, with China No.1 and

SS7 signaling modes provided;

3. Based on multi-level modularized design concept, the system capacity can be flexibly configured and smoothly expanded, so as to provide the optimum performance-to- cost solution.

1.3.4 Virtual HLR and SC functions

In order to satisfy the requirements of administration area management, subscribers belonging to different areas and administration scopes are managed separates. The number of virtual HLRs and SCs can be flexibly defined according to the system capacity and management requirements.

The system can support up to 256 virtual HLRs and virtual SCs.

1.3.5Powerful service functions

1. Mobile subscribers’ automatic roaming and mobility management, handoff processing,

authentication processing, failure treatment, operation and maintenance function etc.;

2. Automatic telephone service and mobile data service between mobile subscribers and

PSTN subscribers, ISDN subscribers, and mobile subscribers;

3. Providing supplementary services such as call forwarding, call barring, call completion, calling number identification, call waiting, call holding, call transfer, multi-party calling, subscriber PIN access, subscriber PIN interception, Do-not- disturb service etc.;

4. Providing WIN services such as pre-paid charging service;

5. Layered and phased software design fully takes into account the transition to the third

generation cellular mobile communication system.

1.3.6Excellent compatibility and expandability

The system strictly abides by the CDMA technical specifications and related standards of the Ministry of Information Industry, and can be successfully inter-connected with products conforming to these specifications and standards. It provides the open A- interface, as well as the standard interfaces with PLMN, PSTN, ISDN, PSPDN etc.

The multi-layer and modularized structure is adopted in the system design to enable flexible capacity expansion and application. The user can perform flexible configuration according to the actual requirements.

1.3.7Superexcellent reliability

Critical parts, such as the main processor and switching plane, all work in active/standby and hot backup mode, with the function of automatic switchover at failures, so as to ensure the uninterrupted operation of the system.

The database system uses Cluster dual-system structure and RAID mode.

The control system adopts dual-system dual-bus structure, with dual-network structure

adopted, to enhance the system reliability.

Security protection measures are taken, such as cascade authority control.

1.3.8 Perfect operation and maintenance system

1. Windows NT is used as the man-machine interface, which provides flexible,

convenient and reliable operations;

2. Multiple near-end and far-end access modes are provided, allowing both local maintenance and remote maintenance via the network system. Operation maintenance can be implemented on both the entire system and the specific functional entities;

3. Good security, cascade authority protection;

4. The system is possessed of multiple management functions, such as accounting management, security management, performance management, failure management, configuration management, service observation, signaling tracing, version management, clock management etc. and is able to provide accurately, reliably, practically and conveniently multiple operation and maintenance facilities, and corresponding functions can be added based on the actual network operation status and the users’ requirements;

5. The system provide abundant on-line help contents, with multiple help means such as table of contents, index etc.; the universal Windows interface and operation modes tally with the users’ daily operation habit;

6. The Client/Server architecture facilitates the user to obtain the dynamic information

and history information.

TCP/IP

MSC/VLR/SSP

SC/VM

HLR/AUC

SS7

OMC-S

Network

m

anagement

c e n te r

Billing

center

BSS

Subsystem

PLMN

PSTN

ISDN

PSPDN

Q3

X.25/DDN

A Interface

Fig. 1-6 Network structure CDMA cellular mobile communication system solution

1.3.9 Features of CDMA cellular mobile communication system solutions

CDMA cellular mobile communication system has the following features:

1. Standardization

Conforming to IS95A/B and CDMA2000 1X, making full use of the technical

advantages of CDMA;

The No.7 signaling system completely conforms to the related technical

specifications stipulated by the Ministry of Information Industry and passed tests;

Strictly abiding by the country’s mobile communications trade standards for CDMA

mobile communication networks;

Strictly abiding by various CDMA technical specifications and protocols laid by the

Ministry of Information Industry;

The first system that provides GB ISO4.0 and IOS2.x A interfaces. In addition, it supports the IS634 standard, and is compatible with the CDMA base station systems of multiple manufacturers;

The kernel network supports the ANSI41-E protocol, and is compatible with the

ANSI41 series protocols;

In the aspect of WIN, the system supports IS-771 and IS-826 and various related

national WIN standard protocols corresponding to these standards;

Providing flexible supports to different frequency bands to facilitate the network

operators’ selection;

The interface with fixed network is air interface or SS7.

2. Superior Performances

The partial separated and modularized system design integrates network entities,

such as MSC and VLR, HLR and AUC, and SC and VM respectively;The modularized architecture satisfies flexibly and reliably different requirements forconfiguration and capacity expansion;

BSS adopts internally the packet transmission mode, which enhances the E1

utilization;Supporting various soft and hard handoff modes;Supporting large number of subscribers;Flexible and stable accounting and network management;High security and reliability, and perfect operation and maintenance system;

All the service functions required by CDMA 2000 1X can be realized by means of

addition of hardware entities and software upgrading of the system.

3. Easy MaintenanceFriendly graphic operation and maintenance tools in both Chinese and English;Universal Windows interface and on-line help;Well-equipped system maintenance functions;

Multiple communication modes are supported to realize remote/local maintenance,

extremely reliably and conveniently.

Based on the above analysis, we can come the following conclusion: The early stage investment of this system appears a little bit high, but, in the long run, considering the transition to cellular network and expansion for new services, this scheme undoubtedly the best choice. Therefore, we recommend to use this scheme to build up cellular mobile communication systems.

1.4 Routing plan

Route plan is closely related to the network structure. Digital mobile communication network usually adopts a 3-level structure: Tandem MSC 1 (TMSC1), Tandem MSC 2 (TMSC2) and local mobile switching center (MSC). That is: TMSC1s are established in the macro cell, and the TNSC1s are connected one another through meshed networks; in principle, one or two province-level TMSCs, also called TMSC2s, are established in each province, and the TMSC2s of various provinces should be connected with the corresponding TMSC1s; the network is divided into several mobile service local networks, and each mobile service local network contains one or several MSCs, which are connected with the corresponding TMSC2s.

1.4.1Setting of circuit groups

The trunk circuit groups between various TMSCs, between TMSCs and mobile end offices and between mobile telephone end offices can be classified into two types: low call loss circuit group and high-efficiency direct circuit group.

1.7.1.1 Setting of low call loss circuit groups

Low call loss circuit groups should be provided between TMSC1s.

Low call loss circuit groups should be provided between various mobile end offices and

TMSCs and between TMSC2s and TMSC1s.

The call loss index of low call loss circuit groups should be below 1%, and their traffic is

not allowed to overflow to other routes.

1.7.1.2 Setting of high-efficiency direct circuit groups

High-efficiency direct circuit groups should be established as required between any two MSCs with high traffic. The traffic of high-efficiency circuit groups is allowed to overflow to other routes. The specific setting can be carried out according to related specifications about public networks.

1.4.2Route selection

1.7.2.1 Route selection principles

Routes are generally selected according to the principle of high-efficiency direct routes first and then low call loss routes. Calls initiated by fixed subscribers to mobile subscribers are immediately directed to a nearby mobile network, and the mobile network implements the connection; calls initiated by mobile subscriber to fixed subscriber are immediately directed a fixed network, and the fixed network performs the connection. The basic principle of “reliability, fastness and ease for billing” is essentially adhered to in route selection in China.

1.7.2.2 Mobile subscriber calls fixed subscribers

When a mobile subscriber calls a fixed subscriber, the call is first routed to the GMSC, and the GMSC performs called number analysis. There are two cases of analysis results: 1. The GMSC routes the call directly to the LS of the fixed subscriber, as shown in Fig. 1-7.

Fig. 1-7 Schematic Route Connection for Call from Mobile Subscriber to Local Fixed Subscriber

2. The GMSC directs the call to the trunk office, and PSTN network is used for the

connection to the fixed subscriber, as shown in Fig. 1-8.

Fig. 1-8 Schematic Route Connection for Call from Mobile Subscriber to Out-of-town Fixed Subscriber

1.7.2.3 Fixed subscriber calls mobile subscribers

When a fixed subscriber calls a mobile subscriber, the call is first directed to the nearby local GMSC, which implements inquiry of the called route information and connects the call to the MSC of the called party, as shown in Fig. 1-9.

Fig. 1-9 Schematic Route Connection for Call from Fixed Subscriber to Mobile Subscriber

1.7.2.4 Mobile subscriber calls mobile subscribers

When a mobile subscriber calls a mobile subscriber, the initiating MSC analyzes the called number, inquires the called subscriber’s route information, and implements call connection in the mobile network.

1.5 Numbering plan

1.5.1 Numbering plan

1. Mobile Subscriber Directory Number (DN)

DN refers to the number to be dialed by the calling subscriber when the present

network’s mobile subscriber acts as the called party.

The structure of DN is shown Fig. 1-10.

CC

MAC

H0H1H2H3

ABCD

+

+

+

International mobile subscriber DN number

National valid subscriber DN number

Fig. 1-10 DN structure

In which,CC: country code, 91 for IndiaMAC: mobile access code.

H0H1H2H3: HLR identification number, which is assigned by the service

provider;

ABCD: mobile subscriber number.

2. International Mobile Subscriber Identifier (IMSI)

IIMSI is the number that exclusively identifies a mobile subscriber in the CDMA digital

mobile network. The structure of IMSI is shown in Fig. 1-11.

Fig. 1-11 IMSI structure

In Which,MCC: mobile country code, 404for IndiaMNC: mobile network code, such as 00 for India

MSIN: mobile subscriber identification number, which is a 11-digit decimal

numeral

3. Mobile Station Identification Number (MIN)

MIN implements mobile station identification as defined by the AMPS standard. The

structure of MIN is shown in Fig. 1-12.

Fig. 1-12 MIN structure

In which,NPA: numbering plan area;

H0H1H2H3: the same as H1H2H3 in DN;

ABCD: subscriber number.

4. Temporary Local Directory Number (TLDN)

When a mobile subscriber is called, the MSC temporarily assigns a number to the mobile subscriber to enable the network to perform route selection. The number structure is shown in Fig. 1-13.

Fig. 1-13 Structure of TLDN

5. Electronic Serial Number (ESN)

ESN is a number that exclusively identifies one mobile station device, and an exclusive ESN is assigned to each mobile station. It contains 32 bits. The supplier of the mobile station sets the equipment serial number.

6. System Identifier (SID) and Network Identifier (NID)

In the CDMA network, a pair of identifier numbers (SID and NID) jointly identifies a

mobile service local network. The system identifier (SID) contains 15 bits.

The network operator assigns the SID and NID. “0” an “65535” of the NID are reserved. “0” indicates those base stations that do not belong to specific NID areas in a certain SID area, while “65535” indicates the mobile subscriber can roam in the whole SID.

7. Registration Zone Identifier (REG_ZONE)

REG_ZONE is a number that exclusively identifies a location area in the SID area or NID area. Containing 12 bits, it is assigned by the network operator, as long as it is not repeated in the SID or NID range.

8. GT Number Setting

In all messages, the GTI (GT Indication) of the SCCP layer is set as 4.

When the mobile station roams to a new visited MSC, the visited MSC sends messages to the HLR for the first time (registration message and registration authentication message). The calling GT of this message SCCP layer should be set as the MSC number of this MSC, with the translation type (TT) set as

0; the called GT of the SCCP layer should be set as the IMSI number of the mobile station, with TT set as 0.

When the mobile station is called, the originating MSC sends messages to the HLR. The calling GT of this message SCCP layer should be set as the MSC number of this originating MSC, with the translate type (TT) set as 0; the called GT of the SCCP layer should be set as the MDN number of the called mobile station, with TT set as 0.

When the mobile station sends short messages, the messages can be transferred via the MC to which the calling mobile station belongs. The called GT of this message SCCP layer sent to the MC should be set as the MDN number of the mobile station, with TT set as 128. The calling GT should be set as the MSC number of the calling mobile station service MSC, with TT set as 0.

When the mobile station receives short messages, the messages can be transferred via the MC to which the called mobile station belongs. The called GT of this message SCCP layer sent to the MC should be set as the MDN number of the mobile station, with TT set as 128.

The MSC IN, Sender IN and Destination Address parameters in the MAP (ANSI41)

messages should be set as the corresponding GT numbers.The SCCP layers in other MAP and WIN messages should all be set with correspondingGT information.

9. Base Station Identifier (BSID)

As a 16-bit integer, BSID exclusively identifies a base station under an NID. It is

assigned by the network operator.

Message ParametersThe ISUP parameters in this section are used in the SS7 ISUP Message Format Configure API message.

DefinitionsThe table below indicates the IDs and descriptions for ISUP parameters. Some parameters are marked with a number indicating the telecommunications standard supported by a parameter:

1ANSI

2ITU

The parameters that are not marked by a number are supported in both ANSI and ITU standards.

Parameter Name

ID Description

Access Delivery Information 2

0x2E Information sent in the backward direction indicating that a SETUP message was generated at the destination access.

Access Transport 0x03 Information generated on the access side of a call and transferred transparently in either direction between the originating and terminating local exchanges. The information is of significance to both users and local exchanges.

Automatic Congestion Level

0x27 Information optionally included in a Release Message and sent to the exchange at the other end of a circuit to indicate that a particular level of congestion exists at the sending exchange.

Backward Call Indicator (BCI)

0x11 Information sent in the backward direction consisting of the charge indicator, called party's status indicator, called party's category indicator, end-to-end method indicator, interworking indicator, end-to-end information indicator, ISDN User Part indicator, holding indicator, ISDN access indicator, echo control device indicator, and SCCP method indication.

Business Group 1 0xC6 Information sent in either direction to indicate the identity of the Multi-Location Business Group associated with a number (e.g. the Calling Party Number), the identity of a Subgroup within that Multilocation Business Group and the Line Privileges allocated to the number.

Call Diversion Information 2

0x36 Information sent in the backward direction indicating the redirection reason and the notification subscription option of the redirecting user.

Call History Information 2

0x2D Information sent in the backward direction to indicate the accumulated propagation delay of a connection.

Call Reference 0x45 Circuit independent information identifying a particular call.

Called Party Number (CDPN)

0x04 Information sent in the forward direction to identify the called party and consisting of the odd/even indicator, nature of address indicator, numbering plan indicator, and address signals.

Calling Party Number (CGPN)

0x0A Information sent in the forward direction to identify the calling party and consisting of the odd/even indictor, nature of address indicator, numbering plan indicator, address presentation restriction indicator, screening indicator, and address signals.

Calling Party's Category (CPC)

0x09 Information sent in the forward direction indicating the category of the calling party, e.g. ordinary subscriber, test call.

Cause Indicators 0x12 Information sent in either direction consisting of the coding standard, location, cause value and diagnostics. It indicates the reason for sending the message in which it is contained, e.g. the Release, Address complete or Confusion messages, and identifies the network in which the message originated, e.g. local network, transit network, remote local network.

Charge Number 1 0xEB Information sent in either direction indicating the chargeable number for the call and consisting of the odd/even indicator, nature of address indicator, numbering

plan indicator, and address signals.

Circuit Assignment Map 1

0x25 Information identifying the map format and the circuits in a multi-rate connection. For the DS 1 map format it identifies the DS0 circuits constituting a NxDS0 connection. The circuit assignment map is used only for NxDS0 calls when non-contiguous time slot allocation is used.

Circuit Group Characteristics Indicator 1

0xE5 Information sent in response to a request for circuit validation, indicating the characteristics of the concerned circuit group in terms of carrier type, double seizing control, alarm handling and continuity check requirements.

Circuit Group Message Supervision Message Type Indicator

0x15 Information sent in either direction in a circuit group supervision message and consisting of the circuit group blocking type indicator.

Circuit Identification Name 1

0xE8 Information identifying the exchanges on which a circuit group terminates and the number of each trunk within that group.

Circuit State Indicator

0x26 Information indicating the state of a circuit according to the sending exchange.

Circuit Validation Response Indicator

0xE6 Information indicating the far-end results of a circuit validation test.

Closed User Group Interlock Code 2

0x1A Information uniquely identifying a closed user group within a network.

Common Language Location Information Code (CLLI) 1

0xE9 Information used for circuit validation to identify a switching office by town, state, and building subdivision. (COMMON LANGUAGE is a registered trademark and CLLI is a trademark of Bell Communications Research, Inc.)

Connected Number 2

0x21 Information sent in the backward direction to identify the connected party.

Connection Request

0x0D Information sent in the forward direction on behalf of the Signaling Connection Control Part requesting the establishment of an end-to-end connection and consisting of the local reference, point code, protocol class, and credit.

Continuity Indicators

0x10 Information sent in the forward direction indicating whether or not the continuity check on the outgoing circuit was successful. A continuity check successful indication also implies continuity of the preceding circuits and successful verification of the path across the exchange with the specified degree of reliability.

Echo Control Information 2

0x37 Information sent in the forward direction indicating whether or not an outgoing half echo control device is included in the connection.

Egress 1 0xC3 Information sent in the forward direction by the first

incoming exchange in the terminating exchange area, to indicate network specific attributes associated with the terminating exchange, e.g. the interexchange carrier, the point of interconnection, and type of terminating access service.

End of Optional Parameters

0x00 The end of optional parameters field indicates that there are no more optional parameters in the message.

Event Information 0x24 Information sent in either direction consisting of the event indicator and event presentation restriction indicator.

Facility Indicators 2

0x18 Information sent in facility related messages identifying the facility or facilities with which the message is concerned.

Forward Call Indicator

0x07 Information sent in the forward direction consisting of the incoming international call indicator, end-to-end method indicator, interworking indicator, end-to-end information indicator, ISDN User Part indicator, ISDN User Part preference indicator, ISDN access indicator, and SCCP method indicator.

Freephone Indicators 2

0x41 No description available.

Generic Address 1

0xC0 Information in the form of an address pertaining to a supplementary service (e.g., dialed number, destination number) and including type of address, nature of address and numbering plan indications.

Generic Digits 1 0xC1 Information in the form of digits pertaining to a supplementary service, (e.g. account code, authorization code, private network class mark) and including type of digits and encoding method indicators.

Generic Name 1 0xC7 Information sent in the forward direction containing specific name related information.

Generic Notification 2

0x2C Information sent in either direction intended to provide supplementary service notification to a user.

Generic Number 2

0xC0 A number information sent in either direction to enhance network operation or for supplementary services.

Generic Reference 2

  (reserved) For further study.

Hop Counter (ITU – reserved)

0x3D Information sent in the forward direction to minimize the impact of lAM looping. The initial count determines the maximum number of contiguous SS7 interexchange circuits that are allowed to complete the call, assuming all subsequent intermediate exchanges decrement the hop counter.

Information Indicators

0x0F Information sent in either direction consisting of the calling party address response indicator, connected address response indicator, calling party's category response indicator, charge information response indicator, and solicited information indicator.

Information Request Indicators

0x0E Information sent in either direction consisting of the calling party address request indicator, connected address request indicator, calling party's category request indicator, charge information request indicator, malicious call identification request indicator, and holding indicator.

Jurisdiction 1 0xC4 Information sent in the forward direction indicating the geographic origination of the call.

Location Number 2

0x3F Information sent to indicate the location of a user in the term of an E.164 number.

MCID Request Indicator 2

0x3B Information sent in the backward direction to request the identity of the calling party for the purpose of malicious call identification.

MCID Response Indicator 2

0x3C Information sent in the forward direction to respond to a MCID request and indicating whether or not the MCID information is available.

Message Compatibility Information 2

0x38 Information sent in either direction indicating how an exchange should react in case this message is unrecognized.

MLPP Precedence 2

0x3A Information sent in the precedence parameter identifying the network resources to which the Multi-level Precedence and Preemption supplementary service is applicable for the call.

Nature of Connection Indicator

0x06 Information sent in the forward direction consisting of the satellite indicator, continuity check indicator, and echo control device indicator.

Network Specific Facilities 2

0x2F Service related information transparently transferred in either direction between the local exchange and the identified network, which contracts the service. The information is significant to both user and the identified network.

Network Transport 1

0xEF A Parameter sent in either direction for the purpose of transporting other ISDN User Part parameters transparently across transit exchanges.

Notification Indicator 1

0xE1 Information Sent in either direction intended to provide supplementary service related notification to a user.

Operator Services Information 1

0xC2 Information sent in the forward direction between operator services entities primarily identifying charging and service type options.

Optional Backward Call Indicators

0x29 Information sent in the backward direction consisting of the in-band information indicator, the call forwarding may occur indicator and the user-network interaction indicator.

Optional Forward Call Indicators 2

0x08 Information sent in the forward direction consisting of CUG, segmentation, and connected line identity request information.

Original Called Number

0x28 Information sent in the forward direction to indicate, in the case of call redirection (e.g., call forwarding), the number of

the user who initiated the initial redirection.

Originating Line Information (OLI) 1

0xEA Information sent in the forward direction, indicating a toll class of service for the call.

Origination ISC Point Code 2

0x2B Information sent in the initial address message of an international call, indicating the point code of the originating ISC.

Outgoing Trunk Group Number (OTGN)

  Information sent in the backward direction indicating the trunk group selected at an outgoing gateway. For intra-network use only.

Parameter Compatibility Information 2

0x39 Information sent in either direction indicating how an exchange should react in case the parameter is unrecognized.

Precedence 1 0x3A Information sent in the forward direction in association with the invocation of the Multi-Level Precedence and Preemption (MIYP) supplementary service, consisting of the look-ahead for busy indication, the precedence level, network identity, and the MI2P service domain.

Propagation Delay Counter 2

0x31 Information sent in the forward direction to indicate the propagation delay of a connection. This information is accumulated while the parameter is transferred through the network. The propagation delay information is represented by a counter counting in integer multiples of 1 ms.

Range and Status (R&S)

0x16 Information sent in either direction in circuit group supervision messages consisting of the range and status.

Redirecting Number

0x0B Information sent in the forward direction indicating the number from which the call was last redirected and consisting of the nature of address indicator, numbering plan indicator, address presentation restriction indicator, and address information (signals).

Redirection Information

0x13 Information sent in the forward direction consisting of the original redirecting reason redirection counter and redirecting reason.

Redirection Number 2

0x0C Information sent in the backward direction indicating the number towards which the call must be rerouted or has been forwarded.

Redirection Number Restriction 2

0x40 Information sent in the backward direction indicating whether the diverted-to user allows the presentation of his number.

Remote Operations

0x32 The remote operations parameter is used to indicate the invocation of a supplementary service identified by an operation value and also carry the result or error indications depending on the outcome of the operation.

Service Activation 0x33 Information sent in either direction to indicate the invocation, acceptance or rejection of supplementary services, when no service associated parameter is to be

sent.

Signaling Point Code 2

0x1E Information sent in a release message to identify the signaling point in which the call failed.

Special Processing Request 1

0xE5 Information sent in the forward direction from a private network access node to service node in the public switched network to indicate that the call requires special processing at that node e.g. private network number translation or verification of authorization codes.

Subsequent Number 2

0x05 Information sent which includes E/O indicator, address signals and filler.

Suspend/Resume Indicators

0x22 Information sent in either direction consisting of the suspend/resume indicator

Transaction Request 1

0xE3 Information sent in the Initial Address Message (lAM) to help continue call processing, using Transaction Capabilities (TC), associated with a given call during an assist or hand-off procedure.

Transit Network Selection (TNS)

0x23 Information sent in the forward direction indicating the transit network(s) requested for the routing of the call and consisting of the type of network identification, network identification plan, and network identification.

Transmission Medium Requirement 2

0x02 Information sent in the forward direction indicating the type of transmission medium required for the connection (e.g. 64Kbps unrestricted speech).

Transmission Medium Requirement Prime 2

0x3E Information sent in the forward direction indicating the fallback connection type in case of fallback.

Transmission Medium Used

0x35 Information sent in the backward direction indicating the resulting fallback connection type used for a call after the fallback has occurred.

User Service Information (USI)

0x75 Information sent in the forward direction indicating the bearer capability requested by the calling party and including as a minimum the coding standard, information transfer capability, transfer mode, and information transfer rate.

User Service Information Prime

0x30 Information sent in the forward direction indicating the preferred bearer capability requested by the calling party.

User Teleservice Information 2

0x34 Information sent in the initial address message indicating the Higher Layer Compatibility information requested by the calling party.

User-to-User Indicators

0x2A Information sent in association with the response to a request for user-to-user signaling supplementary service(s).

User-to-User Information

0x20 Information generated by a user and transferred transparently through the intermediate exchanges between the originating and terminating local exchanges.