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Zte ZXSDR BS8800, Technical Manual

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Zte ZXSDR BS8800 Technical Manual Download Page 29

Chapter  2  Working  Principle 

 

 
 
 

On account of the cross air channels of RF subrack and baseband 
subrack in ZXSDR BS8800 , a partition board is placed in the  air 
guide panel (2U) to make separation. 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Confidential and Proprietary Information of ZTE CORPORATION 

23 

Summary of Contents for ZXSDR BS8800

Page 1: ...ation 8800 Technical Manual ZTE CORPORATION ZTE Plaza Keji Road South Hi Tech Industrial Park Nanshan District Shenzhen P R China 518057 Tel 86 755 26771900 Fax 86 755 26770801 URL http ensupport zte com cn E mail support zte com cn ...

Page 2: ...erchantability fitness for a particular purpose title or non in fringement ZTE CORPORATION and its licensors shall not be liable for damages resulting from the use of or reliance on the information contained herein ZTE CORPORATION or its licensors may have current or pending intellectual property rights or applications covering the subject matter of this document Except as expressly provided in an...

Page 3: ...System Architecture 15 Signal Flow 16 Service Signal Flow 16 Control Signal Flow 18 Clock Signal Flow 18 Power Distribution 19 Ventilation and Heat dissipation Principles 21 Networking and Configuration 25 Abis Interface Networking 25 Baseband RF Interface Networking 26 Cabinet Configuration 27 Board Configuration 30 Equipment Management Modes 33 OMC Mode 33 LMT Mode 34 Technical Indices 35 Engine...

Page 4: ...RF Indices 36 Interfaces and Protocols 41 Network Reference Model 41 Um Interface 42 Abis Interface 47 Common Public Radio Interface CPRI 48 Figures 51 Tables 53 List of Glossary 55 ...

Page 5: ...humidity capacity interface power consumption RF and clock parameters Chapter 6 Interfaces and Protocols Describes the product interfaces and protocols Preface Purpose This manual provides the product overview of ZXSDR BS8800 which will help readers to know its functions features protocol interfaces working principles technical indices and standard compliance Intended Audience Prerequisite Skill a...

Page 6: ...ZXSDR BS8800 Technical Manual This page is intentionally blank ii Confidential and Proprietary Information of ZTE CORPORATION ...

Page 7: ...erfaces 6 Application Scenarios 10 Product Reliability 10 Standard Compliance 12 Position in the Network Figure 1 illustrates the position of ZXSDR BS8800 in a typical CDMA mobile communication network FIGURE 1 ZXSDR BS8800 POSITION IN CDMA NETWORK Table 1 lists the description of NE terms used in Figure 1 Confidential and Proprietary Information of ZTE CORPORATION 1 ...

Page 8: ...unction MSC Mobile Switching Center AGW ASN GateWay PDSN Packet Data Service Node MGW Media GateWay ZXSDR BS8800 locates between BSC and MS to fulfill three functions of BTS Communication with MS through Um interface Communication with BSC through Abis interface Control over radio channels Product Appearance Figure 2 shows the appearance of ZXSDR BS8800 2 Confidential and Proprietary Information o...

Page 9: ...8800 adopt ing 48V DC power supply The ZXSDR BS8800 adopting 24V DC power supply contains an extra 1 U PSU subrack and a different power distribution subrack Its appearance diagram is omitted here Product Functions ZXSDR BS8800 product functions are listed inTable 2 Confidential and Proprietary Information of ZTE CORPORATION 3 ...

Page 10: ...ers within the 20 MHz band in case of single RF link Supports electrical antenna Interface Baseband RF interface supports CPRI interface Abis interface supports IP Over Ethernet Access and IP Over TDM Access RF part restores synchronization clock through baseband RF interface supports delay measurement and implements delay compensation Network ing Supports star and chain networkings of outgoing RR...

Page 11: ...vice Peak forward data rate is 3 1 Mbit s Peak reverse data rate is 1 8 Mbit s Product Features ZXSDR BS8800 product features are listed as follows Indoor integrated base station that adopts 19 inch standard cabinet with a compact structure Supporting multiple frequency bands High maintainability and reliability High capacity and integration to save network establishment and capacity expansion exp...

Page 12: ...ack equipped during the adoption of 24V DC power supply and baseband subrack Figure 3 shows RF subrack external interfaces on the RSU panel FIGURE 3 RF SUBRACK EXTERNAL INTERFACES 1 ANT2 RX 2 ANT1 TX RX 3 RXout 4 TX1 RX1 5 TX2 RX2 6 DBG 7 MON 8 AISG 9 POWER 10 RXin Table 4 lists the description of RF subrack external interfaces 6 Confidential and Proprietary Information of ZTE CORPORATION ...

Page 13: ...rface to connect the subordinate cascaded RSU RSU DBG Completes network interface debugging and interface test RSU MON Provides dry contact input interface and RS485 environment monitoring interface RSU AISG Completes the connection to antenna feeder AISG interface RSU POWER DC power input interface RSU RXin Frequency extension input interface to input diversity received signals RSU Fan Subrack Ex...

Page 14: ...le 6 lists the description of 48V power distribution subrack external interfaces TABLE 6 48V POWER DISTRIBUTION SUBRACK EXTERNAL INTERFACE DESCRIPTION Interface Description 48 V 48 V DC input terminal 48 V RTN 48 V DC grounding terminal 24V Power Distribution Subrack External Interfaces Figure 6 shows the external interfaces on the panel of the 24V power distribution subrack FIGURE 6 24V POWER DIS...

Page 15: ...N Table 8 describes the external interfaces of the PSU subrack TABLE 8 PSU SUBRACK EXTERNAL INTERFACE DESCRIPTION Interface Description 48V OUTPUT1 48V DC output interface 1 48V OUTPUT2 48V DC output interface 2 24V INPUT 24V DC input interface MON PSU subrack fan monitoring interface Baseband Subrack External Interfaces Figure 8 shows the external interfaces on the baseband subrack panel FIGURE 8...

Page 16: ...n ZXSDR BS8800 attaches great importance to the project demand and the flexibility of base station construction The in door macro cell in particular takes up less room supports wall mount installation adopts forward routing technology and com pletes subrack plugged out maintenance in front of the cabinet ZXSDR BS8800 is applicable for the equipment room with less space available ZXSDR BS8800 is lo...

Page 17: ...roof design Failure remote location a better mode for field hard fault and graceful failure Reliable grounding design Consideration of structure hot design and overall wiring Simplification and error protection design Software reliability lies mainly in the following items 1 Software operation support reliability Collects periodical statistics of task CPU occupancy and heap Monitors abnormal statu...

Page 18: ... TIA EIA IS 127Enhanced Variable Rate Codec Speech Service Option 3 for Wideband Spread Spectrum Digital Systems1996 TIA EIA IS 634AMSC BS Interface for Public Communications Networks1998 TIA EIA IS 637 Short Message Service for Wideband Spread Spectrum Cellular Systems1995 TIA EIA IS 658 Data Service Interworking Function Interface for Wideband Spread Spectrum Systems TIA EIA IS 707 Data Service ...

Page 19: ...read Spec trum Communications Sytems ITU Recommendation Z 100Specification and Description Lan guage SDL 1994 ITU Recommendation Z 120 Message Sequence Charts MSC 1992 ITU T M 3010Principles for a Telecommunications Management Network1996 ITU T M 3020TMN Interface Specification Methodology1995 ITU T M 3100Generic Network Information Model1995 ITU T M 3200TMN Management Services and Telecommunica t...

Page 20: ...n Systems Intercon nection System Management State Management Function 1992 ITU T X 732Information Technology Open Systems Intercon nection System Management Attributes for Representing Re leationships1992 ITU T X 733Information Technology Open Systems Intercon nection System Management Alarm Reporting Function1992 ITU T X 734 Information Technology Open Systems Inter connection System Management ...

Page 21: ...and part BBU and RF part RSU For the conve nience of maintenance ZXSDR BS8800 separates the two parts in system architecture with them interconnected via optical fiber Figure 9 shows the ZXSDR BS8800 system architecture FIGURE 9 SYSTEM ARCHITECTURE In ZXSDR BS8800 BBU takes charge of the processing of baseband part while RSU the RF part Their functions are described as follows CC is the main contr...

Page 22: ...erface SA module fulfils environment monitoring forZXSDR BS8800 cabinet and the equipment room provides Abis interface function for the Abis connection that adopts T1 E1 and also conducts dry contact monitoring access In the forward services RSU first converts baseband signal into carrier signal before signal amplification and then sends the radio signal from antenna after signal filtering In the ...

Page 23: ...ent to FS for IQ ex change demultiplexing interleaving frame encoding and parallel to serial conversion iv The data is distributed to RSU through CPRI optical inter face v The baseband signal is sent out through antenna after car rier modulation and amplification by RSU Reverse Service i The reverse CDMA RF signal received by antenna trans forms into baseband digital signal after RSU filtering and...

Page 24: ... CC is the main control function board of ZXSDR BS8800 to distribute control signals into other boards Figure 11 shows the control signal flow FIGURE 11 CONTROL SIGNAL FLOW Clock Signal Flow ZXSDR BS8800 system clock is distributed by CC to other boards and distributed via optical interface to RSUs Figure 12 shows the system clock signal flow of ZXSDR BS8800 18 Confidential and Proprietary Informa...

Page 25: ...s sec tion describes 48V and 24V power distribution principles With the adoption of 48V DC power supply the 48V power dis tribution subrack implements the overall equipment power distri bution After being led into the cabinet the primary power is dis tributed to the baseband subrack BBU RF subrack composed of multiple RSUs and fan subrack FAN by the power distribu tion subrack PDM The PDM provides...

Page 26: ...ack implements overall equipment power distribu tion After being led into the cabinet primary power is distributed to the RF subrack composed of multiple RSUs and fan subrack The PSU subrack converts 24V DC into 48V DC to provide for BBU The PDM provides 8 circuit breakers to control power on and power off of the BBU fan subrack and every RSU Figure 14 illustrates 24V power distribution principle ...

Page 27: ...band subrack Ventilation and Heat dissipation Principles The overall heat dissipation of ZXSDR BS8800 baseband subrack and RF subrack is completed through the fan subrack air guide panel and the fan unit of BBU Figure 15 shows the overall ventilation of ZXSDR BS8800 Confidential and Proprietary Information of ZTE CORPORATION 21 ...

Page 28: ... and top air exhaust mode due to the vertical placement of RSU modules in the RF subrack The BBU fan unit in the baseband subrack internally adopts a right to left ventilation due to the horizontal placement of BBU board Two air guide panels 1 U are each placed at the top and at the bottom of BBU to form an external air channel with front air intake and back air exhaust Air enters the baseband sub...

Page 29: ...le On account of the cross air channels of RF subrack and baseband subrack in ZXSDR BS8800 a partition board is placed in the air guide panel 2U to make separation Confidential and Proprietary Information of ZTE CORPORATION 23 ...

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Page 31: ...d GE FE connections are available Figure 16 shows the Abis interface networking FIGURE 16 ABIS INTERFACE NETWORKING BSC connects into the BBU of ZXSDR BS8800 through E1 T1 in terms of star networking and chain networking either alternatively or associatively Star networking means that each ZXSDR BS8800 point to point connects to BSC directly via E1 T1 or GE FE or indirectly through an external tra...

Page 32: ...th optical fiber as its physical connection A single FS module in BBU provides 6 optical inter faces at most Figure 17 shows the ZXSDR BS8800 baseband RF interface networking FIGURE 17 BASEBAND RF INTERFACE NETWORKING Figure 17 above shows that BBU and RSU support star networking chain networking and any combination of the two Star networking each RSU point to point connects into BBU It boasts hig...

Page 33: ...wer supply as shown in Figure 18 and Figure 19 FIGURE 18 CABINET CONFIGURATION 48V 1 RF subrack 2 Cable tray 3 48V power distribution subrack 4 Fan subrack 5 Air guide panel 2U 6 Lightning subrack 7 Air guide panel 1U 8 Baseband subrack 1 9 Air guide panel 1U 10 Baseband subrack 2 Confidential and Proprietary Information of ZTE CORPORATION 27 ...

Page 34: ...ubrack 9 Air guide panel 1U 10 Air guide panel 2U Table 10 lists the description of ZXSDR BS8800 cabinet con figuration TABLE 10 CABINET CONFIGURATION DESCRIPTION Name Height Quantity Configuration Description RF Subrack 6U 6 Compulsory Supports up to 6 RSUs implements carrier modulation and receives radio signals and waves The first slot must 28 Confidential and Proprietary Information of ZTE COR...

Page 35: ...k 2U 1 Compulsory Its upper layer is equipped with 6 fans and a FCE module to monitor and report the operation status of each fan Air Guide Panel 2U 2U 1 Compulsory Equipped with a partition board inside across the cabinet to make two isolated compartments implementing separation between the air channels of RF subrack and baseband subrack Lightning Subrack 1U 1 Optional Protects baseband from ligh...

Page 36: ...nsmission equipments or an additional BBU in case of baseband capacity inadequacy It is equipped with a blank panel or an air guide panel if no transmission equipments or BBU is configured Board Configuration ZXSDR BS8800 consists of baseband subrack and RF sub rack Baseband subrack is equipped with CC CH FS SA PM and FA boards while RF subrack with RSUs Table 11 lists the descrip tion of ZXSDR BS...

Page 37: ...ervice and CHV for CDMA 2000 1X service Their specific respective number depends on the actual services since mixed insertion is acceptable SA 1 Compulsory PM 1 2 At least one PM is configured Two PM boards can be configured for load sharing FA 1 Compulsory RSU 1 6 It is configured according to carrier number sector number and baseband capacity Confidential and Proprietary Information of ZTE CORPO...

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Page 39: ...34 OMC Mode ZXSDR BS8800 can receive its operation and maintenance management from NetNumen M3 ZXC10 BSSB network man agement system developed by ZTE Corporation Figure 20 shows the details FIGURE 20 ZXSDR BS8800 OMC MODE Confidential and Proprietary Information of ZTE CORPORATION 33 ...

Page 40: ...gement Fault management Security management Report management System tool LMT Mode ZXSDR BS8800 can receive its operation and maintenance management through an alternative mode LMT Local Mainte nance Terminal as is shown in Figure 21 FIGURE 21 ZXSDR BS8800 LMT MODE LMT completes operations such as scaling power query and power adjustment of ZXSDR BS8800 34 Confidential and Proprietary Information ...

Page 41: ...or 24 V DC20 V 28V Working Temperature 40 to 55 40 to 131 Overall Power Consumption 3000 W full configuration Working Humidity 5 RH 95 RH Grounding 5 Ω Performance Indices Capacity Indices A single ZXSDR BS8800 BBU boasts its baseband capac ity of 36 carrier sectors A single RSU supports a top RF output of 60 W A single RSU supports 4 carriers and 1 sector Reliability Indices ZXSDR BS8800 reliabil...

Page 42: ...nchronization source or BTS clock lost GCM may adopt a microwave control crystal to ensure the clock a short time stability The HOLDOVER guarantees the phase shift to be less than 10 µs within 24 hours after the synchronization signal loss which enables the normal performance of BTS Frequency Difference 0 05 ppm Phase Difference 10 µs RF Indices ZXSDR BS8800 works in the 800 MHz Band Class 0 and A...

Page 43: ...BTS conducted spurious emissions with the signal intermediate frequency difference as 1 25 M Standing Wave Ratio 1 50 Receiver Sensitivity 127 dBm RC1 Dynamic Range 127 dBm 65 dBm Noise Figure 3 Adjacent Channel Selectivity ACS Band Class 6 53 dBm 2 5 M Requirements on Receiver Conducted and Radiated Spurious Emissions Within the BTS receive frequency band 80 dBm Within the BTS transmit frequency ...

Page 44: ...S 97 27 dB Total Power The total transmitted power should lies in the manufacturer rated power range from 2 dB to 4 dB See IS 97D for the defini tion and test of total power Waveform Quality Cross correlation coefficient ρ 0 97 Pilot Time Tolerance It should be less than 3us and must not be more than 10us All the CDMA channels under the same BTS should keep 1us to one another Make sure that the ti...

Page 45: ...th 1 25MHz offset of the cen tral frequency equivalent to the CDMA signal level without interfer ence Inter modulation Spurious Response Attenuation FER 1 5 and the MS output power increment 3 dB under the 70dB dual tone interference with 1 25MHz or 2 05 MHz offset of the central frequency equivalent to the CDMA signal level without interference Requirements on Receiver Conducted and Radiated Spur...

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Page 47: ...ference Model The network reference model of the CDMA2000 1x is as shown in Figure 22 FIGURE 22 CDMA2000 1X NETWORK REFERENCE MODEL The description of the interfaces in Figure 22 are described in Table 16 TABLE 16 INTERFACE DESCRIPTION Interface name Interface description Abis Interface between BSC and BTS Confidential and Proprietary Information of ZTE CORPORATION 41 ...

Page 48: ... and PCF PDC A9 A9d Used to carries the signaling transmission between BSS and PCF PDC A10 A10d Used to carries the data transmission between PCF and PDSN PDC and PDS A11 A11d Used to carries the signaling transmission between PCF and PDSN PDC PDS Um Interface The Um interface is the air interface between Mobile Station MS and Base Transceiver Station BTS complying with the IS 2000 ReleaseA standa...

Page 49: ...ication automatic request retransmission addressing segment and reassembly The uppermost layer provides signaling service voice service packet data application and circuit data application and imple ments radio resource mobility and connection management of the air interface through signaling service CDMA2000 1x EV DO Um interface The CDMA2000 1x EV DO Um interface is divided into application laye...

Page 50: ...sembly Best effort transmission reliable transmission and duplicate packet detec tion The Default Packet Application provides a byte stream to trans mit packet data between the terminal and the network It in cludes three protocols Flow Control Protocol provides the flow control function for data stream Radio Link Protocol implements byte stream retransmission and duplicate packet detection and pro...

Page 51: ...I distribution Session Configuration Protocol SCP performs session flow negotiation In the 1xEV DO system SCP negotiates the protocol used for communication between the terminal and the network and how to set protocol parameters Connection layer The connection layer controls the air link state In the 1xEV DO system an enabled link between AT and AN means the AT is allocated with RPC RTC and FTC FT...

Page 52: ...w the terminal and the network choose RFC rate Physical layer The physical layer defines structure frequency power out put modulation demodulation and coding decoding of the for ward reverse channel BCMCS Um Interface The Broadcast and Multicast Service BCMCS Um interface im plements broadcast and multicast services Figure 25 shows the structure of the BCMCS Um interface protocol stack FIGURE 25 S...

Page 53: ...ansmission and control information The format of the data frame is the same as that of the control frame with good trans mission transparency high efficiency and continuous trans mission PPP is a link layer protocol designed for the simple link trans mitting data package between same modules PPPmux is to realize single PPP frame transmitting multiple PPP packaging groups sub frame to reduce the PP...

Page 54: ...nt C M plane transport mechanisms and means for synchronization CPRI supports two types of C M chan nels fast and slow The fast channel is based on Ethernet while the slow one is based on the High Level Data Link Control HDLC protocol IQ Data User plane information in the form of in phase and quadrature modulation data digital baseband signals Synchronization Synchronized data is used for frame an...

Page 55: ...r 3 protocols not defined by CPRI that resides on the top of layer 2 protocols Two different layer 2 protocols for C M data subset of High level Data Link Control HDLC and Ethernet are supported by CPRI These additional control and management data are time multi plexed with the IQ data Finally additional time slots are available for the transfer of any type of vendor specific information Figure 27...

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Page 57: ...ure 13 48V Power Distribution 20 Figure 14 24V Power Distribution 21 Figure 15 Ventilation and Heat dissipation Principles 22 Figure 16 Abis Interface Networking 25 Figure 17 Baseband RF Interface Networking 26 Figure 18 Cabinet Configuration 48V 27 Figure 19 Cabinet Configuration 24V 28 Figure 20 ZXSDR BS8800 OMC Mode 33 Figure 21 ZXSDR BS8800 LMT Mode 34 Figure 22 CDMA2000 1x Network Reference M...

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Page 59: ...Subrack External Interface Description 9 Table 8 PSU Subrack External Interface Description 9 Table 9 Baseband Subrack External Interfaces Description 10 Table 10 Cabinet Configuration Description 28 Table 11 ZXSDR BS8800 Board Configuration Description 30 Table 12 ZXSDR BS8800 Engineering Indices 35 Table 13 ZXSDR BS8800 Clock Parameters 36 Table 14 ZXSDR BS8800 800 MHz Band Class 0 RF Indices 36...

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Page 61: ...tion BSS also provides operation and maintenance sub system to implement management of BSS BTS Base Transceiver Station The BTS is the wireless part of the BSS which is a kind of wireless transceiver device serving a certain cell under the control of the BSC It implements radio transmission channel control channel coding and diversity functions and it can be taken as a modem with very complex func...

Page 62: ...Service Node A Packet Data Serving Node is responsible for the establishment maintenance and termination of a PPP Point to Point Protocol ses sion towards the MS Mobile Station It may also assign dynamic IP addresses in addition to supporting Mobile IP functionality It provides a similar function to the GSN GPRS Support Nodes found in GSM and UMTS networks PM Power Module PPP Point to Point Protoc...

Page 63: ...Glossary TDM Time Division Multiplexing UDP User Datagram Protocol Confidential and Proprietary Information of ZTE CORPORATION 57 ...

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