wireless network zxpcs technical specifications_20050608
DESCRIPTION
dectTRANSCRIPT
Table of Contents 1 System Overview ....................................................................................................................1
1.1 Brief introduction to the system....................................................................................1 1.2 System architecture.......................................................................................................1 1.3 System features .............................................................................................................4 1.4 Conditions requirements of the system.........................................................................4
1.4.1 Requirements for equipment room environment .........................................4 1.4.2 Requirements for equipment room safety....................................................5 1.4.3 Requirements for outdoor conditions ..........................................................5 1.4.4 Grounding requirements ..............................................................................5 1.4.5 Requirements on the clock ..........................................................................5
2 System Interface and Indexes................................................................................................7 2.1 System interface............................................................................................................7
2.1.1 Interface between ZXPCS and PSTN/ISDN ...............................................7 2.1.2 Interface between IGW and ICSC ...............................................................7 2.1.3 Interface between IGW and HLR................................................................7 2.1.4 Interface between IGW and OMC...............................................................8 2.1.5 Interface between IGW and billing center...................................................8 2.1.6 Interface between IGW and remote NM terminal .......................................8 2.1.7 ICSC and CSC/RCSC/SCSC.......................................................................8 2.1.8 CS and CSC/RCSC/SCSC...........................................................................8
2.2 System indexes .............................................................................................................8 2.2.1 Switching performance indexes...................................................................8 2.2.2 HLR/AUC indexes ......................................................................................9 2.2.3 ICSC/RCSC/SCSC/CSC indexes ................................................................9 2.2.4 CS28B indexes ..........................................................................................11 2.2.5 Billing unit indexes....................................................................................13 2.2.6 OMC-S indexes .........................................................................................13 2.2.7 OMC-R indexes.........................................................................................13 2.2.8 Transmission indexes ................................................................................13 2.2.9 Synchronization indexes............................................................................13
3 Service Introduction.............................................................................................................14 3.1 Basic services..............................................................................................................14 3.2 Supplementary service ................................................................................................14 3.3 Value added service ....................................................................................................15
4 System Hardware Structure and Technical Index ............................................................17 4.1 IGW hardware structure..............................................................................................17
4.1.1 Functional structure ...................................................................................17 4.1.2 Rack configuration ....................................................................................18
4.2 HLR/AUC hardware structure ....................................................................................18 4.2.1 Functional structure ...................................................................................18
4.3 CSC/RCSC hardware structure...................................................................................20 4.3.1 Functional structure ...................................................................................20
Wireless Network ZXPCS Technical Specifications 4.4 CS hardware structure.................................................................................................21
5 Networking Mode.................................................................................................................23 5.1 Medium and small-capacity networking.....................................................................23 5.2 Large-capacity networking .........................................................................................23 5.3 Expansion mode..........................................................................................................24
6 Appendix Abbreviations ......................................................................................................25
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1 SYSTEM OVERVIEW
1.1 Brief introduction to the system ZXPCS (Personal Communication System) is a new generation of communication product developed with PHS (Personal Handyphone System) technology, which enables more and more people to communicate anywhere and anytime, and provides voice and data communication services.
ZXPCS can tap the potential of the existing network resources, and provide mobile terminal service and a variety of VASs by accessing, via SS7/E1 interface, the exchanges running in PSTN. • The services provided and supported by ZXPCS include:
Voice service Emergency call service
• Special services (caller number display, call forwarding on busy, call forwarding on no reply, and call forwarding unconditional)
1.2 System architecture The system architecture of ZXPCS is shown in the following diagram:
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Fig. 1-1 ZXPCS architecture
Where:
ICSC Integrated Cell Station Controller
CS Cell Station
CSC Cell Station Controller
RCSC Remote Cell Station Controller
SCSC Smart Cell Station Controller
HLR Home Location Register
IGW Interconnected Gateway
OMC-R Operations Maintenance Centre Radio Access Part
ZXPCS is made up of the service control part and wireless access part. The former mainly includes Home Location Register (HLR), PCS Interconnected Gateway (IGW) and Operations Maintenance Center Service control Part (OMC-S), while the latter mainly includes Integrated cell station controller (ICSC), Cell Station Controller (CSC/RCSC/SCSC) and Operations Maintenance Center Radio Access Part (OMC-R).
The functions of the ZXPCS components are described below:
1. IGW
The main functions of IGW in the system are as follows: support voice channel management, voice channel connection and mobility management, local database management, and provide the centralized monitoring channel for the management platforms of operations maintenance at the same time. The main functions are as follows: • Support voice channel allocation • Support the connection of message paths between various ICSCs • Control the roaming handover of the subscriber among various ICSCs
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• Provide a uniform service control platform for the network • Provide interfaces for the service providing part • High scalability as a result of the modular structure
2. HLR
HLR keeps the information of all mobile subscribers in the network, including their identities, location area and class of service.
3. ICSC
ICSC is connected to the central switching unit via an internal interface, enabling the subscriber to control the incoming/outgoing calls of the speech communication via the local network, and provide line concentration control function as well.
The signal output from the local exchange undergoes digital multiplexing and protocol processing at ICSC, and then it is transmitted to CSC/RCSC via optical fiber, microwave or copper cable links. CSC/RCSC and ICSC can be connected via optical fiber, or via the High-Speed Digital Subscriber Line (HDSL) devices and paired copper cables, for transmitting signals to the subscribers far away.
IGW and ICSC can be connected with an internal interface. ICSC and CSC/RCSC/SCSC are connected with an E1 interface in between. ICSC and the local exchange can be installed in the same place. In addition to the interface function, the single module ICSC also provides a centralized user database, mobility management function and line concentration control function. In the system networking with multi-module ICSC, IGW should be set to implement the centralized control and management of multiple ICSCs.
Multiple CSC/RCSCs and cell stations are connected via ICSC, forming a network to cover certain areas. Each single module ICSC can connect up to 50CSC or 16 RCSCs or 100 SCSCs.
The main functions of ICSC are summarized as follows: • Provide the interface with CSC/RCSC/SCSC (base station interface unit); • Provide the interface with the switching network (network interface unit); • Store local subscriber information (subscriber data unit); • Control the roaming registration and handover of the subscriber among
CSC/RCSC/SCSCs (call control and processing unit); • Integrate wired access and radio access; • Support operations maintenance function for network devices (administration and
maintenance unit); • Forward messages between the CS and database • Manage roaming subscribers in the presence of multiple modules
4. CSC/RCSC/SCSC
CSC/RCSC/SCSC is connected with ICSC in E1 mode. The CSC/RCSC/SCSC can control CS, convert signals, allocates voice and signaling timeslots.
CSC/RCSC/SCSC supports the line concentration processing of the voice path, implements roaming handover among various local CSs, and implements dynamic frequency allocation and channel allocation for a number of CSs at the same time.
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CS is connected to CSC/RCSC via ISDN 2B+D mode, while CSC/RCSC/SCSC sends the Q.931 signaling call of CS into IGW via ICSC, and broadcasts the IGW signaling to the corresponding CS for processing. In addition, CSC/RCSC/SCSC provides the CS operation and maintenance channel, including the data/program loading process, CS status transmission, etc. CSC/RCSC/SCSC functions are as follows: • Support the call access control of CS • Provide the remote loading channel from the OMC to CS, and support OMC to
control and query remote CSs • Request the authentication key triple from the database, for user authentication
process • Register PS locations • Support PS handover among various CSs in one PA (PAGING AREA), and support
the PS roaming and handover among various CSs in different PAs.
1.3 System features Support internetworking and interconnection between networks and inside a network via the open standard interfaces; • High system capacity and performance, making expansion convenient; • Various VASs can be conveniently introduced via the sophisticated switching
platform; • The system features high stability and reliability, while the network is made highly
stable by means of the mature switch technology; • Flexible implementation of networking and project construction; • Clear NM structure, powerful functions, safe and reliable, easy to user.
1.4 Conditions requirements of the system
1.4.1 Requirements for equipment room environment The equipment room of the ZXPCS should conform to the Communication Equipment Room Environment Conditions, a publication of the Ministry of Information Industry (MII) of China.
IGW, HLR, ICSC:
Temperature: 15°C~30°C
Relative humidity: 40%~65%
CSC/RCSC:
Temperature: 0°C ~40°C
Relative humidity: 20%~90%
Cleanness: the content of dust with diameter over 5µm should be ≤3×104 particle/sq. Meter, while the dust should be non-conductive, non-magnetic and non-corrosive.
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Electromagnetic interference: field strength ≤ 140µV/M, frequency range: 0.01MHz~110000MHz
As the equipment may malfunction against temperatures too low/high in the environment, the equipment should usually be installed air-conditioners to maintain the room temperature within a suitable range.
1.4.2 Requirements for equipment room safety There must be handy fire-fighting equipment in the equipment room.
Sockets of different voltages in the equipment room should be labeled clearly.
No explosives and inflammables in the equipment room.
1.4.3 Requirements for outdoor conditions • The equipment room should not be exposed to strong electromagnetic radiation, lest
the signal transmission should be affected. • The equipment room should be located in places not vulnerable to damages caused
by natural disasters. • The equipment room should be far away from animal inhabits, lest the foundation
should be damaged, causing equipment damage and human injuries.
1.4.4 Grounding requirements Satisfactory grounding of the communication equipment can maintain the normal running of the equipment and protect it against lightning stroke. According the stipulations in General Technical Specification of Telephone Switching Equipment of MII, there should be three separate grounding wires, i.e., AC distribution safety ground, working ground and the lightning-proof grounding wire for main distribution frame. The ground resistance requirements are as follows:
The ground resistance of AC working ground: no more than 4Ω
The ground resistance of AC working ground: no more than 1Ω
The ground resistance of lightning protection ground: no more than 10Ω
The ground resistance in general grounding and combined grounding: no more than 5Ω
1.4.5 Requirements on the clock The normal performance of the system requires that the clock of ZXPCS should be stratum 2 node clock, and in compliance with ITU-G.800, G.801 and G.802 standards.
The synchronization signal provided to ZXPCS can be BITS clock signal, and it can be transmitted via E1 trunk signal.
The provided BITS can either be 2048kbit/s, or 2048kHz.The line pairs connected should be coaxial cable pairs.
For the SDH transmission equipment used in the system, the synchronization mode should be external reference signal timing mode, and BITS should be introduced to serve as the external reference signal. The transmission node without BITS should be synchronized to BITS in the STM- N line signal timing mode, rather than the internal timing source. If any
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part of the transmission equipment fails to receive the clock reference sent from BITS, it means that the performance of the entire ZXPCS may be easily disturbed.
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2 SYSTEM INTERFACE AND INDEXES
2.1 System interface Configuration standard specification for the ZXPCS Personal Wireless Communications System Interface See the following diagram
Fig. 2-1 Diagram of system interface
2.1.1 Interface between ZXPCS and PSTN/ISDN SS7 connection is provided.
2.1.2 Interface between IGW and ICSC It is the internal interface, 2Mb/s digital interface, in compliance with 2048kb/s Interface Requirements.
2.1.3 Interface between IGW and HLR It is the 2Mb/s digital interface, in compliance with 2048kb/s Interface Requirements.
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2.1.4 Interface between IGW and OMC The internal interface.
2.1.5 Interface between IGW and billing center X.25/DDN/PSTN/E1 communication mode is provided.
FTAM protocol //FTP protocol supported.
2.1.6 Interface between IGW and remote NM terminal X.25/DDN communication mode supported.
2.1.7 ICSC and CSC/RCSC/SCSC Connected with E1 interface.
2.1.8 CS and CSC/RCSC/SCSC Connected with U interface (2B+D).
2.2 System indexes
2.2.1 Switching performance indexes System capacity: 600,000
Quantity of subscribers: 600,000
Quantity of trunks: 76,800
Traffic: 27,000Erl
Call processing capability: 2,700k BHCA
Inter-exchange trunk reference load
Reference load A: 0.7Erl/line
Busy hour call attempts: 42/busy hour/incoming circuit
Reference load B: 0.85Erl/line
Busy hour call attempts: 57/busy hour/incoming circuit
PS reference load
Reference load: 0.045Erl/subscriber
Average call duration: 55s/call
Location updating: 3/subscriber/busy hour
Handover: 3/subscriber/busy hour
Authentication: 6/subscriber/busy hour
Dimension: External dimensions of the cabinet conform to the international standard, that is, 2200mm×810mm×600mm (height × width × thickness). The width will be 870mm with side panels added. and the height will be 2000mm without the top cover.
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Weight: 250kg under full configuration.
2.2.2 HLR/AUC indexes System capacity: 600,000 subscribers
Reference load:
Call processing: 3 times of processing/subscriber on busy
Mobility management: 3 times of processing/subscriber on busy
Authentication: 6 times of processing/subscriber on busy
Message loss probability: P≤10-7
Information retrieval delay: ≤1000ms (probability 95%)
Registration delay: 2000ms (probability 95%)
Dimension: 2000mm*810mm*600mm (height*width*depth) (A cap needs to be added when the upper wiring mode is used, and the height will be 2200mm, and the width is 870mm with side plates attached)
Weight:less than 250kg in full configuration.
2.2.3 ICSC/RCSC/SCSC/CSC indexes
2.2.3.1 ICSC Performance and Environment Indexes
System capacity: 3000 wireless channels
Operating voltage: DC -57V~-40V
Grounding resistance: <1 ohm.
Power consumption: <1500W
Temperature range
1) Long-term working condition: 15ºC~25ºC
2) Short-term working condition: 0ºC~45ºC
Humidity range
1) Long-term working condition:30%~65%
2) Short-term working condition: 10%~90%
Dimension: 2000mm×810mm×600mm (Height × width × thickness) (A top cover is needed when employing the upward wiring mode, hence increasing the height to 2200mm. The width is 870mm with a side board)
Weight: 250kg with full configuration
2.2.3.2 RCSC Performance and Environment Indexes
System capacity: 64 CSs (1C3T) /Local RCSC or 48CSs (1C3T) /Remote RCSC
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Operating voltage: DC -57V-40V
Grounding resistance: <1 ohm.
Power consumption: <1500W
Operating temperature: 15°C~30°C
Relative humidity: 40%~65%
Dimension:
Remote RCSC cabinet: 2000mm × 600mm × 650mm (Height × width × depth)
Local RCSC cabinet: 2000mm×810mm×600mm (Height × width × thickness) (A top cover is needed when employing the upward wiring mode, hence increasing the height to 2200mm. The width is 870mm with a side board)
Weight
Remote RCSC cabinet: About 180kg
Local RCSC cabinet: About 250kg
2.2.3.3 SCSC Performance and Environment Indexes
System capacity: 8 CSs (1C3T) or 4CSs (1C7T) /SCSC
Operating voltage: AC 100 ~240 V
Grounding resistance: <5 ohm.
Power consumption: <60W
Operating temperature :
Long-term working condition: 15ºC~25ºC
Short-term working condition: -5ºC~40ºC
Relative humidity:
Long-term working condition:30%~65%
Short-term working condition: 10%~85%
Height: 2U
Width: 19 inch
Depth: 420mm
Weight: 9.8kg
2.2.3.4 CSC Performance and Environment Indexes
System capacity: 20 CSs (1C3T).
Operating voltage: DC -57V~-40V
Grounding resistance: <1 ohm.
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Power consumption: about 300W of each shelf layer (depending on the quantity and type of CS)
Temperature range
1) Long-term working condition: 15ºC~25ºC
2) Short-term working condition: 0ºC~45ºC
Humidity range
1) Long-term working condition:30%~65%
2) Short-term working condition: 10%~90%
Dimension:At full configuration, the CSC big cabinet can be installed with 5 CSC plug-in boxes, The external dimension of the 6U standard plug-in box: 266.5 mm × 482 mm × 318.5 mm (height × width × depth).
2.2.4 CS28B indexes
General characters of the CS28B have been show in the following Table:
Item Specification Remarks
Working frequency 1895 MHz ~ 1920 MHz
The actual frequency in use shall be in accordance with the local regulations
Duplex mode TDD/TDMA Number of radio channels
1C7T
Modulation π/4 DQPSK Transceiving mode Adaptive array Number of antenna ports
8 N-J connector
Antenna resistance 50 Ω Output power 500 mW
The environment indices of the CS28B are given in follow Table:
Item Specification
Installation environment
Outdoor
Temperature -30ºC ~ 60ºC RH 10 ~ 90% (25ºC) Waterproof design IP55
Anti-lightning ± 6kV (power-to-ground) ± 4kV (between power cables and between U interface cables)
ESD protection ± 6 kV (contact discharge) ± 8 kV (air discharge)
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EMI standard EN 55022 Class B
The transmission performance indices of the CS28B are given in follow Table:
Item Specification Stipulations of the Corresponding RCR STD-28
Carrier frequency stability -3 ~ +3 ppm -3 ~ +3 ppm Spurious emission: Inband Outband
≤ 250 nW ≤ 2.5 µW
≤ 250 nW ≤ 2.5 µW
Occupied bandwidth ≤ 288 kHz ≤ 288 kHz Antenna power deviation 125mW: +20% ~
-50% Normal deviation: +20% ~ -50%
Carrier leakage ≤ 80 nW ≤ 80 nW Transient response feature of transmission Time feature Upper limit of transient powerLower limit of transient power
≤ 13 µs Average power: 4 dB Average power: -14 dB
≤ 13 µs Average power: 4 dB Average power: -14 dB
Modulation precision ≤ 12.5% ≤ 12.5% Adjacent channel power: ± 600 kHz ± 900 kHz
≤ 800 nW ≤ 250 nW
≤ 800 nW ≤ 250 nW
Signal transmission speed ≤ ±5 ppm ≤ ±5 ppm Radiation ≤ 2.5 µW ≤ 2.5 µW
Following table shows the receiving performance indices of the CS28B:
Item Specification Stipulations of the Corresponding RCR STD-28
Receiving sensitivity 0 dBµV (Typical) [Note](4 groups of adaptive arrays)
≤ 16 dBµV
Adjacent channel selectivity
≥ 50 dB ≥ 50 dB
Intermodulation feature ≥ 47 dB ≥ 47 dB Spurious response suppression
≥ 47 dB ≥ 47 dB
Conducted spurious emission
≤ 4 nW ≤ 4 nW
Dimensions: 213 mm (H) × 424 mm (W) × 464 mm (D), excluding the protruded part.
Weight: About 25 kg.
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2.2.5 Billing unit indexes Number of days in which IGW can buffer tickets: 5 days (calculated assuming there are 10 modules and 3G harddisk space in each module)
Number of days in which billing unit can buffer tickets: 5 days (calculated assuming there is a 30G harddisk space)
Number of DDN links for transmitting billing data: 1~2 2M links needed
2.2.6 OMC-S indexes • Number of manageable NEs: 255 • Number of manageable OMCs: 40 • Number of days for which performance statistic data can be buffered: over 100 days
2.2.7 OMC-R indexes • Number of manageable ICSCs: 20 • Number of manageable CSs: 19200 • Number of manageable terminals: 20
2.2.8 Transmission indexes Error performance: the long-term average BER is better than 110-9.
Bit sequence independence: in 64kb/s channel, no restriction is imposed on the number of continuous binary “1s” or “0s” or any other binary code patterns transmitted.
Absolute group delay:
Average: 900µs
The value not to be exceeded at 95% probability: 1500µs
2.2.9 Synchronization indexes • Synchronous clock: Clock of stratum 2 class A • Minimum clock precision: ±4x10-7 • Pull-in range: ±4x10-7 • Maximum frequency deviation: 10-9/day • Maximum initial frequency deviation: 5x10-10
• Clock working mode: Fast capture, locked, hold-over and free-run • Requirements on clock synchronization link interface: • Jitter and wander of input-end signal: ≥1.5UI, 20~ 2400Hz • Jitter and wander of output-end signal: ≤1.5UI, 20~10000Hz • ≤0.2UI, 18000~100000Hz • 1UI=488ns
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3 SERVICE INTRODUCTION
3.1 Basic services ZXPCS system support voice service, emergent call service etc. present tele-network could provide.
3.2 Supplementary service The following supplementary services can be implemented:
3.2.1 Outgoing call barring
The subscriber can restrict the following categories of outgoing calls of the phone set by setting certain dialing procedures:
Restrict all outgoing calls, including the local calls.
Restrict the international and domestic toll automatic calls, but do not restrict local calls.
Restrict the international toll automatic calls only.
Incoming calls will not be restricted at all on the phone set that is registered with outgoing call barring.
3.2.2 Do not disturb service
This service can be used when the subscriber expects not to be disturbed by any incoming call within a certain period. If the subscriber applies for this service, all incoming calls will be rejected, and the caller will be prompted by “Don’t disturb, please. Thanks!”. Meanwhile the outgoing calls of the subscriber will not be restricted.
3.2.3 Malicious call tracing
When the subscriber applies to the operator for malicious call tracing service, malicious calls will be traced and the number of the malicious caller will be found out by the operator through corresponding operations.
3.2.4 Interception service
When the subscriber encounters an idle number, a modified number, or temporary blocking of the route, etc., the exchange will automatically connect the subscriber to the recording answer-agent device. It is a free service provided by the operator, without any formality of registration or operation by the subscriber.
3.2.5 CFU (Call Forwarding Unconditional)
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When this service is used, all calls to this subscriber number, regardless of the status of the called, will be automatically forwarded to a number specified in advance.
3.2.6 CFNR (Call Forwarding No Reply)
When the subscriber is registered with “CFNR”, all incoming calls to this subscriber will be automatically forwarded to one or several numbers specified in advance if there is no reply in the specified period.
3.2.7 CFB (Call Forwarding Busy)
When this service is used, all incoming calls to this subscriber will be automatically forwarded to another designated number (including the voice mailbox) when busy.
3.2.8 Absent subscriber service
If there is an incoming call when the subscriber is absent, the caller will be prompted by “Sorry! The subscriber you are calling is absent. Please call later.”.
3.2.9 Caller number display
ZXPCS supports this function, and it will be available upon application to the telecommunication service provider.
3.2.10 Caller number display barring
The caller number, if not expected to be seen at the called terminal, can be concealed in the display.
When applying for this service, the subscriber must specify his/her category. The subscriber of category A has the authority to request to restrict the number display through certain operations when originating a call, while the number is usually not concealed to the called. The subscriber of category B has the authority to request to display the number through certain operations when originating a call, while the number is usually concealed to the called. The subscriber number of category C will be permanently concealed to the called.
3.2.11 Unreachable call forwarding
Unreachable call forwarding is to re-connect a call according to the forwarding number pre-set by the subscriber, when it is timeout no response to a paging originated to the called. Paging without response usually occurs when the subscriber is out of the service area, the CS control channel is busy, etc.
3.3 Value added service
3.3.1 Virtual HLR Function
For meet different district administration, HLR could realize corresponding management function. Namely, one HLR entity physically could provide virtual multi-HLR logically, thus business console in different district only operate itself handset number segment.
3.3.2 Zone Restricted Service
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Through this service, the system could permit user ingoing and outgoing in specified zone.
3.3.3 Mobile handset located Service
Uni-number the base station, every base station have a corresponding CSID, ICSC report the CSID of every user located in, and store it in HLR. Thus the system could located the user, the located area is from 50m~500m.
3.3.4 Wireless CENTREX Service
To corporation, school, government etc. group users, the system could set the whole group as a CENTREX. If call occur in the same CENTREX, the flexible billing strategy could be adopted. In fact, CENTREX service is easy for develop large group users.
3.3.5 IN Service
PPS (Pre-Paid Service): This is a typical service of “pay first, serviced next ”. When a subscriber applies for this service, the network operator will give him a unique account number corresponding with his subscriber number. All the call charges of a PPS subscriber will be deducted from his account. Once his balance is not enough or his account expires, the network will reject to provide services for him until he recharges his account. With this service, you can set the maximum sum spent in a day or a month to ensure the economic interests of the service subscriber.
PPS can provide the real-time control mechanism and charging function by means of the mobile IN to ensure the interest of the network operators through controlling the arrears of subscribers and malicious overdraft, to reduce operation risk of telecommunication carriers. Meanwhile, it brings profit for the operators from the sufficient call charge accumulation. With a reasonable charging policy, an operator will be able to attract more service subscribers and enhance the network utilization together with the increased revenues and early recovery of network investment.
3.3.6 Short Message Service
With the short message service, it provides the system with a series of extended service functions, including E-mail notice, short messages via the Internet, E-mail from a mobile station, fees-due notice, and automatic integrated service information station, etc.
3.3.7 Data Service
Besides, ZTE could provide data service such as 32Kbps PIAFS or 64Kbps PIAFS transmission, it could be used for internet access, fax etc.
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4 SYSTEM HARDWARE STRUCTURE AND TECHNICAL INDEX
4.1 IGW hardware structure
4.1.1 Functional structure Comprising CSM (the central module) and MPM (the peripheral module), the IGW system structure is shown below:
Fig. 4-1 IGW system structure
Functions of IGW modules are described below:
1. Mobile Peripheral Module (MPM)
MPM is a basic independent module in IGW, used to implement voice channel connection and signaling processing between intra-module subscribers, and connect the signaling and voice channel between intra-module subscribers and other MPM module subscribers to the switching network module in the SNM center.
2. Center Switching Module (CSM)
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CSM consists of MSM and SNM, and is mainly used for message switching and voice channel switching between modules.
3. Message Switching Module (MSM)
MSM is mainly used for message switching between modules. MPM is connected to SNM via optical fiber with its communication time slot connected to MSM through the semi-fixed connection of SNM, and MP in MSM implements message switching based on the routing information.
4. Switching Network Module (SNM)
SNM, the core module in the multi-module exchange system, is mainly used for voice channel switching between modules in the multi-module system and sending the communication time slots from the multiple modules to MSM through semi-fixed connection.
5. Operation & Maintenance Module (OMM)
OMM is used to manage the switching entities of IGW, including the three parts of system analysis, system maintenance and signaling maintenance. Its functions include the followings: authority management, data configuration, billing management, performance statistics, fault management, diagnosis test, subscriber tracing, signaling tracing, version management, file management, voice loading, service observation, clock management, and database management.
4.1.2 Rack configuration In the CSM module, the large-capacity (64k * 64k) NET board is used to form the plane of the switching network. This plane features low congestion rate, high reliability, fulfilling the communication exchange between peripheral modules. The peripheral module MPM uses the 64k * 64k NET board to form the plane of the switching network and connect ICSC, while accomplishing the connection to PSTN and to other directions.
4.2 HLR/AUC hardware structure
4.2.1 Functional structure The HLR/AUC system mainly consists of the common channel signaling processing part, database part, service processor part and operations/maintenance part. These parts are connected with the HUB through the Ethernet and they communicate with each other via TCP/IP to process the subscriber data. The dual-network connection is employed to ensure the reliability. The system architecture of HLR/AUC is shown below:
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Fig 4-2 The system architecture of the ZXPCS-HLR/AUC
The function and structure of respective unit are described briefly as follows:
Common channel signaling processing unit
Comprising one or more CPMs, the common channel signaling processing unit is mainly engaged in No.7 signaling processing, meanwhile it serves as the interface between HLR/AUC and other functional entities. A CPM provides 48 No.7 links and the number of CPMs may be configured if needed.
Service processing unit
The service processing unit works in the multi-module load-sharing mode and it comprises one or more service processing modules (HSMs), which may be configured as required. Multiple HSMs execute the service processing in parallel and are redundant backups for each other: so if any HSM breaks down, other HSMs will share the task evenly.
Using the high-performance processor, HSM mainly processes the mobile management services, meanwhile it visits the database unit in real time and performs signaling interaction with other functional entities via CPM.
Database unit
The database unit is made up of one or more data modules (HDMs). This unit adopts the distributed storage mode to divide the subscriber data into different sections according to the range of the data, and different sections are stored in different HDMs.
An HDM is made up of, in terms of hardware, two servers and one disk array. The Cluster technique is employed to enhance the system reliability and its data are stored in the RAID mode.
It runs Windows NT operating system (for enterprises) and Microsoft SQL Server database.
Operations & maintenance unit
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The operations & maintenance unit consists of the operations & maintenance server (OMM Server), and the handling console and maintenance console that’s connected with the OMM Server. Both the handling console and maintenance console providie man-machine operation platform. An operator can, with the maintenance console, keep track of the running conditions of the HLR/AUC system, and detect and clear faults, and manage subscribers through the handling console. Furthermore, the remote service handling and operations/maintenance can be handled via the router.
4.3 CSC/RCSC hardware structure
4.3.1 Functional structure CSC/RCSC controls CS, converts the signaling, and allocates voices and signaling timeslots. CSC/RCSC extracts the synchronization clock from the PCM digital link, and sends the synchronization clock to CS, thus realizing CS synchronization. CSC/RCSC is connected with CS through the U interface. The subscriber line board may use CSI board and CSMC board (supporting ZTE CS only) to connect to various CSs. A CSI board can provide 8 U interfaces without remote feeding. And a CSC can provide up to 40 U interfaces. RCSC can provide up to 96 U interfaces.
CSC can provide 4 channels of HDLC links when connecting to ICSC via the E1 interface. It may also connect to the transmission system via 2×2Mb/s, then to ICSC via the transmission system, in this case it can be placed near the CS as the remote control unit, thus enhancing the system networking flexibility. If ICSC is connected with CSC via SDH, the TPI board is used to reduce jitter.
RCSC adopts SP host-standby board as main control board. It completes the control to CSI and CSMS. SP contects DTI by cable then DTI contects to transmission and transmission connects to ICSC. CKG boards provide synchronization for RCSC. Its input signal is 2 LVDS 8Khz synchronization signal provided by DTI board. And also can be connected with GPS to provide 1s synchronization signal.
The main functions of CSC /RCSC are: • Provide the interface for multiple CSs, and controlling CS. • Assign voices and signaling timeslots, connect to LC network, meanwhile assign
channels for multiple CSs. • Monitor the status of the CSI, CSMC boards and the U interface, and reporting to
ICSC. • Convert the ISDN signaling from CS into the internal signaling and sending it to
ICSC. • Convert the internal signaling from ICSC into the ISDN signaling and sending it to
CS. • On the basis of protocol conversion, carry out the flows of incoming call, outgoing
call and handover as a supporting unit. • Request the authentication key triple to implement user authentication control. • Provid the remote loading channel from the OMC to CS, and support OMC to
control and query remote CSs.
The functional structure of CSC is shown in the following diagram:
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Fig 4-3 The Block diagram of CSC functional structure
4.4 CS hardware structure
The hardware structure of the CS28B cell station is shown in following Figure.
Fig 4-4 Functional Modules of the CS28B
Following is a description of the functional modules of the CS28B
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1. RF interfaces
The RF interface part is composed of the transceiver to implement the transceiving function of radio signals. The interface indices comply with the RCR STD-28 V3.3 standard.
2. Radio signal processing and radio control
The radio signal processing and radio control part completes the TDMA/TDD processing of baseband signals and uses the intelligent algorithms to modulate and demodulate signals.
3. Central control
The central control part provides the functions of system control, call connection and operation &maintenance.
4. Line interfaces
The line interface part is connected to the CSC or RCSC via the U interface line. Its physical layer interface specifications comply with ANSI T1.601-1992.
5. Power supply module
The power supply part generates stable DC voltage to ensure the normal running of the CS28B.It is connected externally to the 220V mains supply.
The ZXPCS CS28B has the following features:
1. Large transmitting power and high receiving sensitivity.
2. Using adaptive array antenna technology.
3. Multi-channel capability. A single CS provides 1C7T and the bundled CSs support 1C15T, 1C23T or 1C31T, depending on how much CSs are bundled.
4. Supporting the use of a single CS or the main CS in the case of bundled CSs as a GPS CS.
5. Using the RF interfaces in compliance with the RCR STD-28 V3.3 standard.
6. Using the U interface in compliance with the ITU-T G.961 and ANSI T1.601 (1999) standards.
7. Showing the line status via LED indicators.
8. Using the RS-232C interface for local maintenance.
9. Advanced EMC features.
10. Reliable waterproof design.
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5 NETWORKING MODE
5.1 Medium and small-capacity networking See Fig. 6-1 for the networking mode.
Fig. 6-1 Networking mode of medium and small-capacity exchanges
This networking mode applies to small and medium exchanges, accommodating 60,000
subscribers. It involves one IGW processing module (MPM) and an MPM can process 60.000 subscriber.
5.2 Large-capacity networking See Figure 6-2 for the networking mode.
Fig. 6-2 Networking mode of the large-capacity exchange
Note: SDH is an optional configuration and not included in this system.
MPM
IGW PSTN
ICSCICSC ...
... ...
MPM
IGW CSM
ICSC ...
... ...
ICSC
...MPM
...
... ...
ICSC ICSC
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This networking mode applies to large exchange, accommodating 600,000 subscribers. It involves the CSM and 1~10 peripheral IGW modules (MPMs), each MPM supporting up to 60,000 subscribers, and provides the interface to the public and private networks and ICSC. MPM and CSM are connected using the optical fiber.
5.3 Expansion mode ZXPCS can be expanded linearly without frequency planning needed. Besides, the convenient expansion can fully protect the original investment of the user. Usually it is built phase by phase. In phase 1, a network of wide coverage is built in IGW mode, as the roaming area has to be large enough to attract adequate subscribers, thus lowering the cost of early-stage construction. Then the network can be expanded along with the rise of network subscribers and network traffic. The IGW of ZXPCS can support up to 10 MPMs, each configured with 6 ICSCs, while The number of MPMs and ICSCs can be added along with the growth of subscribers, thus expanding the capacity.
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6 APPENDIX ABBREVIATIONS Abbreviation Full name
ACK ACKnowledgement
ACM Accumulated Call Meter
ACM Address Complete Message
AE Application Entity
ASE Application Service Element
ASN.1 Abstract Syntax Notation One
ASS Absent Subsciber Service
AUC Authentication Centre
ASLC Analog Subscriber Line Circuit
ASIC Analog Single
BCP Basic Call Process
BCM Basic Call Management
BCSM Basic Call State Model
B-ISDN Broadband ISDN
BAIC Barring of All Incoming Calls supplementary service
BAOC Barring of All Outgoing Calls supplementary service
BCTL Back Control
BDT Back Digital Trunk
BHCA Busy Hour Calling Attemp
BNET Back Network
BO All Barring of Outgoing call supplementary services
BOIC Barring of Outgoing International Calls supplementary service
BS Basic Service (group)
BS Bearer Service
BSG Basic Service Group
CAMEL Customized Applications for Mobile Networks Enhanced Logic
CAP CAMEL Application Part
CCAF Call Control Function
CAI Charge Advice Information
CC Country Code
CC Call Control
CCF Conditional Call Forwarding
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CCITT The International Telegraph and Telephone Consultative Committee
Cct Circuit
CF All Call Forwarding services
CFB Call Forwarding on mobile subscriber Busy supplementary service
CFNRc Call Forwarding on mobile subscriber Not Reachable supplementary service
CFNRy Call Forwarding on No Reply supplementary service
CFU Call Forwarding Unconditional supplementary service
CI CUG Index
CIC Circuit Identification Code
CID Call Instance Data
CKDR Clock Driver
CKI Clock Input
CLI Calling Line Identity
CLIP Calling Line Identification Presentation supplementary service
CLIR Calling Line Identification Restriction supplementary service
CM Connection Management
CMD CoMmanD
COLI COnnected Line Identity
COLP COnnected Line identification Presentation supplementary service
COLR COnnected Line identification Restriction supplementary service
COMM COMMunication
CONNACK CONNect ACKnowledgement
CP Core Processor
CPM Common signaling Process Module
CRC Cyclic Redundancy Check (3 bit)
CS Cell Station
CS1,2 Capability Set 1,2
CSC/RCSC/SCSC Cell Station Controller
CSI CAMEL Subscription Information
CSL Component Sub-layer
CSM Central Switch Module
CSPDN Circuit Switched Public Data Network
CUG Closed User Group supplementary service
CW Call Waiting supplementary service
DB Data Base
DET DETach
DFP Distribution Function Plane
DISC DISConnect
DL Data Link (layer)
DSN Digital Trunk Network
DSNI Digital Trunk Network Interface
DTAP Direct Transfer Application Part
DTMF Double Tone and Multiple Frequency
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DTI Digital Trunk Interface
DP Detection Point
DPC Destination Point Code
DSLC Digital Subscribe Line Circuit
EC Echo Canceller
EPROM Erasable Programmable Read Only Memory
ETS European Telecommunication Standard
ETSI European Telecommunications Standards Institute
FBI Fiber Bus Interface
FIM Feature Interaction Management
FE Function Entity
FEAM Function Entity Access Management
FTN Forwarded-to number
GFP General Function Plane
GIGW Gate Interconnected GateWay
GPS Global Position System
GSL General Service Logic
GSM Global System for Mobile communications
GT Global Title
HANDO HANDOver
HDLC High level Data Link Control
HLC High Layer Compatibility
HLR Home Location Register
HOLD Call hold supplementary service
HW High-way
IAM Initial Address Messag
IAI Initial Address Message with Information
ID IDentification/IDentity/Identifier
IGW Interconnected GateWay
IN Intelligent Network
INAP IN Application Protocol
INCM IN Conceptual Model
ISM Infinite State Machine
ISUP ISDN User Part
ITU-T International Telecommunication Union
Ki Individual subscriber authentication key
LAN Local Area Network
LCN Local Communication Network
MACF Multiple Association Control Function
MAP Mobile Application Part
MCC Mobile Country Code
MCI Malicious Call Identification
MF Mobile Forwarding
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MFC Mobile Forwarding Compel
MM Mobility Management
MMI Man Machine Interface
MO Mobile Originated
MP Module Processor
MPM Mobile Peripheral process Module
MSM Message Switching Module
MSRN Mobile Station Roaming Number
MT Mobile Terminated
MTP Message Transfer Part
NDUB Network Determined User Busy
NE Network Element
NF Network Function
NIC Network Independent Clocking
NM Network Management
NMC Network Management Centre
O&M Operations & Maintenance
OMC Operations & Maintenance Centre
OMM Operate Maintenance Module
OMAP Operation Maintenance Application Part
OPC Origination Point Code
OS Operating System
OSI Open System Interconnection
PA Page Area
PCM Pulse Code Modulate
PCS Personal Communacation System
PEPD Peripheral Environment Parameter Detection
PHS Personal Handyphone System
PIC Point In Call
PLMN Public Land Mobile Network
PP Physical Plane
POI Point of Initiation
POR Point of Return
POWB Power B
PS Personal Station
PSID PS IDentifier
PSPDN Packet Switched Public Data Networ
PSNUM PS NUMber
PSM Peripheral Switching Module
PSTN Public Switched Telephone Network
PW Pass Word
RAND RANDom number (used for authentication)
REJ REJect (ion)
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REL RELease
REQ REQuest
SACF Single Association Control Function
SAP Service Access Point
SC Shortmassage Centre (of ZXPCS)
SC Service Code
SCCP Signalling Connection Control Part
SCE Service Creation Environment
SCEF Service Creation Environment Function
SCEP Service Creation Environment Point
SCF Service Control Function
SCP Service Control Point
SDF Service Data Function
SDP Service Data Point
SF Service Feature
SIB Service Independent Building Block
SIU Signaling Interface Unit
SLEE Service Logic Execution Environment
SLEM Service Logic Execution Management
SLP Service Logic Process
SLPI Service Logic Process Instance
SMAP Service Management Access Point
SMAF Service Management Access Function
SMC ShorT Message Center
SME Short Message Entity
SMEM Shared Memory
SMF Service Management Function
SMP Service Management Point
SMS Short Message Service
SMS/PP Short Message Service/Point-to-Point
SN Subscriber Number
SNM Switching Network Module
SPC Signalling Point Code
SS Supplementary Service
SSN Sub-System Number
SS7 Signalling System No. 7
STP Signalling Transfer Point
SYCK Sync Clock
TAF Terminal Adaptation Function
TCAP Transaction Capability Application Part
TE Terminal Equipment
TM Transfer Machine
TMN Telecommunications Management Network
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TS Time Slot
TSL Transaction Sub-layer
TUP Telephone User Part
USSD Unstructured Supplementary Service Data
VDB Visitor DateBase
VLR Visitor Location Register
VPM VDB Process Module
VM Voice Mailbox