Transcript Course 2 BSS Hardware Intruduction and Operation

Course 2
BSS Hardware
Introduction and Operation
• ZXC10-BSS Overview
• BSC Subsystem
• BTS Subsystem
• Antenna System
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ZXC10-BSS Overview
2004.10.3
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CDMA2000 1X Network Structure
BSS
PSTN/
PLMN
Um(IS-95A)
HLR/AUC
Internet
2GBTS Abis
Um(IS-95A)
2GBSC
Um(IS-2000)
A(IOS4.X)
AAA Server
Router
2GBTS Abis
MSC/VLR
IP
Cloud
A(IOS4.X)
HA
Abis
3GBTS
IP Cloud
BSC/PCF
PDSN/FA
Um Interface
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Router
A Interface
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ZXC10-BSS Overview
• The ZXC10 CDMA cellular mobile communication system is a
new-generation (3G) digital cellular mobile communication
system developed by ZTE on the basis of IS-2000 standards
with the purpose of catering to the above requirements.
• The ZXC10-BSS is the core part of a CDMA2000 digital
cellular mobile communication system developed according to
IS-2000 .
---The interface between BSS and MS (Mobile Station) is Um
interface; and the interface between BSS and LE (Local
exchange) is A-interface.
---The BSS mainly performs the function of information
interaction in the air with MSs, and supports high-speed
packet data services at a rate of up to 153.6kbps.
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ZXC10-BSS Network Mode
• Star Networking
• Chain Networking
• Star-Chain Combined Networking
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Star Networking
Chain Networking
BTS0
BTS1
BSC
BTS0
BTS1
BTS2
BSC
BTS2
BTS3
Popular in urbon area
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Used in some rural area
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Star and Chain combined
Networking
BTS0
BSC
BTS1
BTS2
BTS3
BTS4
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B-HIRS&S-HIRS
Any equipment to
communicate with
Small HIRS
other subsystems
can execute
communications
and data exchange
Big HIRS
without system
hardware structure
Small HIRS
changes only if it is
connected with a
non-occupied port
Small HIRS
of “big HIRS” and is
allocated with
network address.
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SMALL HIRS－SVBS
NIM
RS_422
co
dis
SVICM
SVM
MSC
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E1
SVM
SVM
HW
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SMALL HIRS－BDS
E1
BTS_CDSU
RS_422
BSC_CDSU
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co
dis
CCM
CHM
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CHM
RFIM
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System Working Principle（1）
• One of the biggest characteristics of CDMA BSS system is
that service/signaling switching between subsystems or
modules is not in the traditional circuit switching mode but
in the high-speed packet data network switching mode.
---- Hence the system provides the functions of flexible
structure and convenient addition of functional modules.
It can satisfy the switching requirement of voice
communications and adapt to high-speed multimedia data
services. Hence it realizes convenient transition to 3G
system.
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System Working Principle（2）
• The network structure of CDMA BSS is of two levels:
---The first level is HIRS subsystem in BSC, which is
called “big HIRS”. It is the packet data switching center of the
system.
---The second level is the packet data switching network with relatively
low speed formed in SVBS or BDS subsystem, which is called “small
HIRS”. It mainly provides packet data switching services for modules
in SVBS or BDS subsystem
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System Logical Structure
BSS
BSC
BTS
RFS
BDS
PS
TFS
CDSU
PS TFS CDSU HIRS SVBS PCFS CPS BSM
子系
Sub统
system
PAM
CPM
PCFIM
PCF
SVICM
SVM
NCM
NIM
ASM
CDSU
GPST
TCM
PDM
PSMB
CDSU
GPSTM
FDM
TCM
PPM
PSMB
PSMC
PSMD
SAM
RFIM
CCM
CHM
HPA
RFE
TRX
BTM
模块/单
Moudle/
板
Board
BSS comprises BSC and BTS. In logic, BSC and BTS are two
systems in cooperation to provide services for CDMA mobile
subscribers.
In hardware, these are two different physical entities in
different positions in the telecom network.
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ZXC10-BSS Features
•
•
•
•
•
•
1. Advanced ness: The system makes use of a lot of advanced technologies, for
example high-speed packet switching.
2. Forward compatibility: The system is designed by fully considering the
transition to the third-generation (3G) mobile communication system. High-speed
packet data services can evolve smoothly to 2M.
3. High integrity: ZXC10-BSS makes usage of a lot of advanced components to
improve system integrity and reduce board types and amount.
4. High reliability: The amount of boards in the system is reduced. Important
boards of the system adopt 1+1 or N+1 redundancy configuration and software
error tolerance design. System reliability is highly improved.
5. Configuration flexibility: In addition to supporting traditional networking
modes, ZXC10-BSS also realizes the daisy chain connection mode for up to 6
BTSs. According to the requirements, each BTS can be configured into 1TRX/1sector to 4TRX/3-sectors.
6. Supporting rich service types: ZXC10-BSS supports voice calls (8K, 13K, 8K
EVRC voice coding), test calls (Markov call, Loop back call, TDSO call), data
calls, circuit-type data services (asynchronous data and G3 fax), and
supplementary services.
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BSS System Technical
Performance（1）
•
•
•
•
•
•
•
•
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1. It adopts the packet switching network structure and provides 128 full-duplex
ports. The rate of each port is 8 Mbps;
2. It provides the radio resource management and BTS monitoring functions to
implement BSS operation and maintenance management and BTS tests;
3. It supports star, chain and ring networking of BTS and provides the daisy
chain connection function of BTS;
4. It supports 8KQCELP, 13KQCELP and EVRC algorithms and provides
strong background noise suppression ability;
5. It supports data calls originated by MS, LE or PDSN. It supports circuit-type
data services (asynchronous data and G3 fax) and high-speed packet data
services of up to 153.6kbps;
6. It can provide up to 240 E1s to be connected with LE;
7. It can support up to 7200 selectors/vocoders;
8. Its maximum traffic processing ability is up to 5040Erl;
9. It can be connected with up to 380 BTSs;
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BSS System Technical
Performance（2）
• 10. The maximum amount of PPP connections supported by packet
data reaches 40,000;
• 11. The channel board supports the sharing of all sector channel units
at the same carrier frequency;
• 12. It supports forward/reverse power control;
• 13. It supports macro-cellular, micro-cellular and Pico cellular;
• 14. It supports a variety of soft handover modes: intra-BTS soft
handover, intra-BSC soft handover, and inter-BSC soft handover;
• 15. It supports the cell breathing function to ensure the service quality
of busy cells;
• 16. It supports cell shrinkage and expansion;
• 17. It supports the frequency configuration of Band Class 0 （800MHz
cellular frequency band）、Band Class 1（1900MHz PCS frequency
band）和Band Class 5（450M frequency band).
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The End!
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