CN1409563A - Base station device for wide bard radio cut-in system - Google Patents
Base station device for wide bard radio cut-in system Download PDFInfo
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Abstract
A base station devices for wide-band wireless access system incldue indoor unit and its connected outdoor unit, among which the outdoor unit is composed of RF unit connected by RF cables and its corresponding antennas and the indoor unit conatins a 48v power source. It features that the indoor unit has two secondary power source modules backplate and several lead-in units connected is sequence by a circuit after the said 48 v power source, the said lead-in units providing backbone network interfaces and base band IF interfaces, and each of the lead-in units and the said outdoor unit connected with it make up a fan zone connected by the IF cable occupying one of the antennas. Each fan zone provides its individual independent backbone network interfaces.
Description
Technical field
The present invention relates to a kind of device of wireless telecommunications of broadband wireless fixed access system, relate in particular to the base station apparatus that the broadband wireless integrated service in the communication field inserts.
Background technology
Broadband wireless fixedly access device towards the service object be emerging telecom operators, the characteristics of user's request are both to have required equipment that the wideband data access function can be provided, and take into account the traditional circuit business again, and, because frequency resource is relatively more nervous, requires very high to the air bandwidth utilance.
Support IP (Internet Protocol) data access service and circuit access service, can take different air interface implementations, the IP-based aerial packet transfer scheme of the row of comparative maturity (option A) and based on time-multiplexed aerial circuit transmission scheme (option b).Below the pluses and minuses of each scheme are compared.
Option A adopts MAC (medium access control) layer protocol based on packet switching aloft, and business datum is combined into the packet packet switch of dividing into groups, because its principle is consistent with the IP data network, data service has good tenability to IP.But this scheme is relatively more difficult to the Circuit Service support, generally adopts VoIP (internet voice phone) mode to realize voice service, almost can not support fixedly leased line business.The adoptable aerial MAC agreement of this scheme is many, and technology comparative maturity, cost are also relatively cheap, and the broadband wireless access product of BreezeCom company promptly adopts this scheme.The air interface of BreezeCom product adopts WLAN (wireless local area network) 802.11MAC agreement, 10Base_T (10 mbit ethernet) is provided network interface, adopt voip technology to support voice service, aerial available bandwidth is about 2Mbit/s (MBPS), but, be subjected to the MAC protocols limit, air bandwidth can not full duplex be used, and bandwidth availability ratio is lower.
Option b adopts time division multiplexing mode aloft, is each terminal distribution fixed-bandwidth, can support Circuit Service well, also can solve by fixing leased line mode for the IP data service.The disadvantage of this scheme is that air bandwidth can not be carried out dynamic assignment according to business datum flow size, when IP data service in the network when great, can not carry out the user bandwidth reallocation, bandwidth availability ratio is extremely low.In order to overcome this defective, a kind of improved procedure is that air bandwidth is divided into some base units, distribute according to terminal request, but because allocation unit is fixed, bandwidth availability ratio is still not high.Adopt the product that companies such as SRT, AirSpan are arranged of this mode, this series products is poor to the tenability that the IP data service inserts.
Summary of the invention
The objective of the invention is to overcome and of the prior art not enough shortcoming is supported in IP data service and the transmission of speech circuit mix of traffic, provide a kind of and solve the defective of the integrated service access capability difference that exists in the existing wireless access wide band technology for BWA provides the base station apparatus of the effect of backbone network interface and aerial transmission link control.
The present invention realizes like this, this base station device for wide bard radio cut-in system comprises indoor unit and coupled outdoor unit, this outdoor unit mainly is made of radio frequency unit that is connected with radio frequency cable and corresponding with it antenna element, this indoor unit contains-48 volts of power supplys, be characterized in that connect this after this indoor unit also contains-48 volts of power supplys and two secondary power supply modules that connect with circuit successively, backboard and several provide the access unit of backbone network interface and base band IF interface; And wherein each access unit is connected by immediate frequency cable with this coupled outdoor unit and constitutes a sector, takies an antenna in this antenna element; Each sector provides separately independently backbone network interface.Above-mentioned antenna element adopts fan antenna or omnidirectional antenna.Described antenna element is to adopt 6 fan antennas, and promptly 60 degree antennas have 6 radio frequency units and 6 corresponding with it connections of base station access unit; Said backbone network interface comprises 2 E1 circuit connecting interfaces and a 10MHZ Ethernet interface, and the up link of air interface adopts the empty pattern of sending out, and down link adopts continuous mode; Its multiplexing transmission of the immediate frequency cable of said connection access unit and indoor unit receives intermediate frequency and post a letter intermediate frequency and power supply, pilot signal and frequency reference.Said access unit comprises Network Interface Module and the fundamental module that is connected with two-way circuit; Said Network Interface Module comprises business interface unit and the medium access control unit that becomes two-way circuit to connect respectively with it, main control unit; Wherein, this business interface unit becomes two-way with individual E1 interface with a 10MHZ Ethernet interface respectively and is connected, the two-way connection serial ports of this main control unit RS232; This medium access control unit then becomes than connecting to circuit with the base band ifd module respectively with main control unit; The main body of media control unit is a coprocessor in the said Network Interface Module, and the main body of main control unit is a primary processor, also is connected between them by a programmable logic units; Said coprocessor is the MPC8240 minimum system; Said primary processor is the MPC860 minimum system; Said base band ifd module comprises into baseband processing unit and the intermediate frequency unit that two-way circuit connects, wherein, and the two-way connection Network Interface Module of this baseband processing unit; The IF interface that then connects radio frequency unit to intermediate frequency unit; Said base band blade unit comprises the data and the transmit block of descending continuous modulation system, the Data Receiving of uplink burst demodulation mode and demodulation parts, the modulator-demodulator of the monitoring communication of reference oscillation source, connection and the outdoor unit of transmission outdoor unit and the modulator that connects with circuit successively, low pass filter and numerical control gain amplifier, the transmission intermediate frequency that is sent to outdoor unit adopts Low Medium Frequency, is 42MHZ; This Data Receiving and demodulation parts comprise the tuner that connects with circuit successively, intermediate-frequency filter, automatic gain intermediate frequency amplifier and demodulator, the reception intermediate frequency that sends from outdoor unit are the 176MHZ high-frequency signal, and it is converted to 27MHZ, carry out demodulation process again.
Systems soft ware of the present invention comprises primary processor resident software part and mac controller resident software part.The primary processor resident software resides on the primary processor, finishes the air interface protocols function of system's control, network interface protocols stack, network management and part; The mac controller resident software resides on the mac controller, finishes over-the-air protocol stack function.
Apparatus of the present invention compared with prior art, can be supported the IP data service preferably, make full use of air bandwidth, can guarantee the service quality to Circuit Service again preferably, satisfy application requirements well.
Description of drawings
Fig. 1 is a BWA overall framework schematic diagram of the present invention.
Fig. 2 is a base station equipment hardware block diagram of the present invention.
Fig. 3 is an outdoor radio frequency unit hardware block diagram of the present invention.
Fig. 4 is an access unit functional block diagram of the present invention.
Fig. 5 is the hardware principle block diagram of network interface part of the present invention.
Fig. 6 is the hardware principle block diagram of base band intermediate-frequency section of the present invention.
Fig. 7 is a base station equipment software systems general illustration of the present invention.
Fig. 8 is a base station equipment software systems application software schematic diagram of the present invention.
Embodiment
One of the present invention who provides according to Fig. 1-Fig. 8 embodiment preferably below, and described in detail:
See also accompanying drawing 1, it has shown that the overall framework of BWA of the present invention constitutes.
BWA is the fixed wireless access product of point to multiple spot, system is when networking, form a honeycomb by a base station equipment or 1 with several terminal equipments or abbreviation terminal 2, just can cover whole user area by several honeycombs by rational planning and design again.Each honeycomb inside can be divided into several sectors, and this device adopts the Typical Disposition of 6 sectors (60 degree antenna).Distance obtains the business of certain grade and capacity in the assignment of 200 meters several terminals 2 in 5 kilometer range according to webmaster.Each base station equipment 1 is made up of 6 base station access units 111, unifies power supply by power module 113 by backboard 112.
Base station equipment 1 provides 2 E1 circuit connecting interfaces and 10 mbit ethernet interfaces at the backbone network interface, and the up link of air interface adopts burst mode, and each terminal 2 must be visited up channel in the suitable time in TDMA (time division multiple access) mode according to agreement.Down link adopts continuous pattern, base station equipment 1 sends data in the mode of broadcasting to all terminals 2, system must converge to the downlink data packet of burst on continuous MPEG (motion picture expert group standard) transport stream, detects separately reception information by each terminal 2 on mpeg stream.Base station equipment 1 needs descending discrete packet is converged on the continuous mpeg transport stream, and is modulated into the intermediate frequency waveform by continuous modulation system, and the intermediate-freuqncy signal with up burst modulation is demodulated to packet simultaneously.
See also accompanying drawing 2, it has been described the hardware configuration of base station equipment 1 and has formed.
Base station equipment 1 is positioned at backbone network one side in whole system, be the Service Access point of whole honeycomb, and concrete hardware can be divided into 2 main portions: indoor unit (IDU) 11 and outdoor unit (ODU) 12.
The business module of the indoor unit 11 in the base station equipment 1 is access units (AU) 111, and access unit 111 is veneers, and backbone network interface, Base-Band Processing and IF interface are provided.An access unit 111 is connected by immediate frequency cable 13 with connected outdoor unit 12, constitutes a sector together, uses 1 antenna 122, and each sector provides separately independently backbone network interface.Two block power supply modules 113 are provided in the machine frame of indoor unit 11, are operated in the activestandby state of Hot Spare, to improve the reliability of equipment.
Indoor unit machine frame in the base station equipment 1 provides 6 access units 111 and 2 power modules 113 altogether.Power module 113 provides some groups of operating voltages by postnotum 112 to access unit 111.
The power supply of base station equipment 1 employing-48V power supply is converted to one group of operating voltage by two secondary power supply module 113 general-48V in the machine, offers access unit 111 and uses.The power supply of outdoor unit 12 is presented by immediate frequency cable 13, and the powered switch of outdoor unit 12 is positioned on the panel of the access unit 111 that is attached thereto.
Access unit (AU) 111 is divided into two circuit modules: Network Interface Module 1111 and base band ifd module 1112.
See also Fig. 3, it has described the hardware principle block diagram of outdoor radio frequency unit 121.
Radio frequency unit 121 provides radio channel for BWA base station equipment 1, finishes processing such as frequency spectrum shift, filtering and amplification.Radio frequency unit 121 is connected with indoor unit 11 by an immediate frequency cable 13, to simplify project installation.Intermediate frequency and intermediate frequency and power supply, pilot signal, the frequency reference (if the frequency stability of outdoor unit 12 can not meet the demands, the frequency reference that can use indoor unit to provide) of posting a letter are provided in transmission simultaneously in the immediate frequency cable 13.Be connected with antenna 122 by a radio frequency cable 123.
Radio frequency unit 121 comprises radiating circuit 1211, receiving circuit 1212, supervisory circuit 1213 and power circuit 1214 compositions.
The transmission frequency of base station equipment 1 is on downstream frequency, and receive frequency is on upstream frequency.On two links of uplink and downlink, because each terminal 2 is inequality and produced the link load difference to the distance of base station equipment 1, on down link, eliminate the difference of this link load, on up link, then control the difference of eliminating this link load by the automated power of terminal 2 by AGC (automatic gain control) circuit of terminal 2.So on technical indicator, the function control range of base station equipment 1 is less, the power control range of terminal 2 is bigger.Because base station equipment 1 is operated on the modulation system of 16QAM (quadrature amplitude modulation), require emitted power relatively also to want big, linear index also requires the duplex mode of higher radio frequency unit 121:
Two-way communication between base station equipment 1 and the terminal equipment 2 works in Frequency Division Duplexing (FDD) (FDD) mode.
The frequency range of wireless duplex:
Descending 3500MHz (megahertz)～3530MHz, up 3400MHz～3430MHz;
Duplex frequency separation: 100MHz
Duplexer is received the inhibition sent out greater than 80dB (decibel).Radio frequency unit 121 multi-access modes
Because of system is PMP (point-to-multipoint) application of TDMA time division multiple access way, radio frequency unit 121 should be supported the TDMA multi-access mode, adapts to the requirement of burst mode to power supply, EMC (Electro Magnetic Compatibility) aspect.The radio frequency channel of radio frequency unit 2 is divided:
Channel spacing is got 3.5MHz.3.5MHz channel spacing centre frequency:
3401+3.5n(n＝0……8)
3501+3.5n(n＝0……8)
Adjacent channel is spaced apart 3.5MHz, and transceiver channel is spaced apart 72MHz recently.
See also Fig. 4, it has described the hardware configuration of the access unit 111 in the indoor unit 11.As shown in the figure,
Access unit 111 is divided into two circuit modules, one is Network Interface Module 1111, comprise that business interface unit 11111 also connects with two-way circuit with main control unit 11113 mutually with the MAC Control Element 11112 that becomes two-way circuit to connect respectively with it and main control unit 11113 these MAC Control Element 11112, another one is a base band ifd module 1112, it comprises into baseband processing unit 11121 and the intermediate frequency unit 11122 that two-way circuit connects, and this baseband processing unit 11121 connects with 11113 one-tenth two-way circuits of mac controller 11112 and main control unit respectively; And intermediate frequency unit 11122 becomes two-way circuit to connect with IF interface.Task to each functional circuit in the access unit 1111 is summarized as follows:
The transmitting-receiving and the preliminary treatment of business datum finished in-business interface unit 11111;
-main control unit 11113 finish to business interface unit 11111, mac controller unit 11112,
The control of baseband processing unit 11121 and outdoor radio frequency unit 12 and supervision, the locating of webmaster message
Reason, the work of treatment of undertaking the IEEE802.3 agreement simultaneously;
-mac controller unit 11112 is finished based on DOCSIS (cable data transmission interface standard)
The air interface protocol of agreement;
-baseband processing unit 11121 finish FEC (forward error correction coding) encoding and decoding, scrambler, synchronously,
Functions such as modulation;
-intermediate frequency unit 11122 is finished the multiplexing of down-conversion and intermediate-freuqncy signal.
See also Fig. 5, it has described the hardware configuration schematic diagram of the Network Interface Module 1111 of access unit 111.As shown in the figure,
Network Interface Module 1111 is divided into 4 physical pieces: Network interface 111110, programmable logic units 111132; Coprocessor 111121; It adopts MPC8240 minimum system and primary processor 111131, and it adopts the MPC860 minimum system.Wherein the part of programmable logic units 1111213 and coprocessor 111121 minimum systems are partly formed mac controller unit 11112, finish aerial MAC control; Another part of programmable logic units 1111213 and primary processor (MPC860) minimum system is partly formed main control unit 11113, finishes master control function.The TC of agreement, PMD and give processing with the data that Network interface 111110 is sent here with the interface of MPC8240.
See also Fig. 6, it has described the hardware elementary diagram of access unit base band intermediate-frequency section.
Access unit 111 provides two kinds of backbone network interfaces (SNI) simultaneously: 2 roadbeds in the circuit interface of standard E1 and 1 roadbed in the 10Mbps of 10Base-T Ethernet interface, because the different in kind of two kinds of business is followed＜access network technology requirement-3.5GHz fixed wireless access the requirement of these two kinds of business) standard (draft) regulation.In native system, these two kinds of business of different nature are brought in the protocol stack, thereby made native system that two kinds of dissimilar business can be provided simultaneously, and reach the requirement of standard.Mac controller unit 11112 converges in Circuit Service and IP operation on the physical layer, forms a continuous transport stream, and it is multiplexing on immediate frequency cable 13 to be modulated into intermediate frequency by baseband processing unit 11121, and the intermediate frequency flow process is just in time opposite for receiving.Baseband processing unit 11121 in the access unit 111 is finished descending continuous modulation, adds two work of uplink burst demodulation.
Baseband processing unit 11121 in access unit 111 will be finished the work of five parts:
The modulation of-data and transmit block, it is mainly by one piece of modulator 111210, and low pass filter 11121 and a numerical control gain amplifier 11122 connect and compose with circuit successively.In base station equipment 1 side, employing be descending continuous modulation system; The transmission intermediate frequency that is sent to outdoor unit 12 adopts Low Medium Frequency, is 42MHz.
The reception of-data and demodulation parts, it is mainly by a tuner 111213, intermediate-frequency filter 111214, AGC intermediate frequency amplifier 111215 and one piece of demodulator 111216 connect to form with circuit successively.In base station equipment 1 side, employing be up burst demodulation mode; The reception intermediate frequency of sending here from outdoor unit 12 is the high intermediate-freuqncy signal of 176MHz, by tuner it is downconverted to 27MHz, carries out demodulation process again.
-present the reference oscillation source 111217 of outdoor unit 12, bigger to the influence of the frequency stability of oscillator because of the diversity ratio of considering outdoor working temperature is bigger, therefore the reference source with outdoor unit is put in indoor.
-present the power supply 111214 of outdoor unit, the power supply of outdoor unit also must be via the IF cable
Present.
The modulator-demodulator 111218 of the monitoring communication of-connection and outdoor unit, by the mode of ASK (amplitude shift keying) modulation, the work of monitoring outdoor unit, as the phase-locked loop indication, transmitting power is controlled, receiving gain control etc.
See also Fig. 7, it has described software systems 3 general illustration of base station equipment 1.
Software systems 3 in the BWA base station equipment 1 can be divided into application software part 31 and support programs part 32, and wherein application software part 31 comprises protocol stack part and webmaster part.Protocol stack comprises network interface protocols stack and air interface protocols, for business datum and network management data provide data channel; Webmaster partly comprises remote centralized webmaster, Telnet, local network management and inner centralized network management, support is based on the remote network management of SNMP (Simple Network Management Protocol) agreement, based on the textual interface webmaster and the local network management that is connected by serial ports of Telnet, and realizes with base station equipment 1 being base station equipment 1, terminal equipment 2 centralized network management at center in internal system.Support programs part 32 comprises operating system 323, BSP (hardware driving) 324, database 322 and system's control 321, for the normal operation of software systems provides support platform, finish multiple task operating system supporting platform, hardware driving platform, database platform, system start-up and fault detection capability.
It is general module that operating system 323 wherein, database 322 and system control 321 functional modules.BSP part 324 is closely related with the processor hardware platform.The application software part 31 of base station equipment resident software mainly comprises protocol stack and webmaster.
Base station equipment software systems 3 reside in respectively on primary processor (MPC8240) and the coprocessor (MPC860).
See also Fig. 8, it has described base station equipment software systems application software 31 schematic diagrames.As shown in the figure:
Wherein the network interface protocols stack provides data channel for remote network management data and business datum, realize functions such as remote network management data transmit-receive, IP operation data forwarding, the protocol sublayers that relates to is LLC (logic link control) sublayer, IP (Internet Protocol) layer, UDP (UDP) agreement, TCP (transmission control protocol) agreement, ARP (address resolution protocol) agreement, SNMP (Simple Network Management Protocol) agreement, TFTP (TFTP) agreement, TELNET (Telnet) agreement and DHCP (DHCP) agreement; Air interface protocols provides aerial data channel for inner centralized network management data and business datum, realize functions such as IP operation data forwarding, inner centralized network management data transmit-receive, air bandwidth distribution, the protocol sublayers that relates to is media access control sublayer, link safety sublayer, LLC sublayer, IP layer, UDP layer, ARP agreement, snmp protocol, TFTP agreement and DHCP agreement; Remote network management is realized OAMAgent and the Telnet textual interface network management interface based on snmp protocol, standard webmaster protocol interface and the Telnet interface that meets SNMP (V2) agreement is provided to the remote network management center, webmaster Agent (agency) part is finished configuration, alarm, performance, charging, the safety function of base station equipment, and realizes the forwarding of terminal equipment network management information by inner centralized network management part software; Local network management provides the hyper terminal character interface that connects by serial ports, with behind the command translation with the shared webmaster of remote network management software agency department branch, realize the local maintenance function of hyper terminal login mode; Inner centralized network management is realized the centralized network management of base station equipment to terminal equipment by air interface protocols, the system management part of resident inner centralized network management on base station equipment, and adopt internal interface between the OAMAgent of terminal equipment.
The application software of main processor software subsystem partly comprises network interface protocols stack (LLC sublayer, IP layer, udp protocol, Transmission Control Protocol, ARP agreement, snmp protocol, TFTP agreement, TELNET agreement and DHCP protocol section), air interface protocols (IP layer, UDP layer, ARP agreement, snmp protocol, TFTP agreement and DHCP protocol section), remote network management, local network management, inner centralized network management; The application software of coprocessor software subsystem partly comprises media access control sublayer, link safety sublayer and the LLC sublayer of air interface protocols.
The device basic structure of aforementioned schemes A and option b generally is divided into network interface and handles and the air interface processing section, functions such as business interface, air interface MAC control, master control are finished in the network interface processing section, and Base-Band Processing, intermediate frequency process and radio frequency processing are finished in the air interface processing section.This device is air interface mac controller part with the main difference part of aforementioned schemes, the air interface mac controller of this device can combine Circuit Service and IP data service and mix aerial transmission, and promptly can satisfy the transmission requirement of two kinds of business, can effectively utilize air bandwidth again.Therefore, this device can be supported the comprehensive access of speech circuit and IP data service well, and can utilize air bandwidth well, compared with prior art, can satisfy actual user demand well.
Claims (12)
1. base station device for wide bard radio cut-in system, comprise indoor unit (11) and coupled outdoor unit (12), this outdoor unit (12) mainly is made of radio frequency unit (121) that is connected with radio frequency cable (123) and corresponding with it antenna element (122), and this indoor unit (11) contains one 48 volts of power supplys; It is characterized in that, connect these 48 volts of power supplys and the two secondary power supply modules (113) that connect with circuit successively, backboard (112) after this indoor unit (11) also contains and several provide the access unit (111) of backbone network interface and base band IF interface; And wherein each access unit (111) and coupled this outdoor unit (12) connect and compose a sector by immediate frequency cable (13), take an antenna in the antenna element (122); Each sector provides separately independently backbone network interface.
2. base station device for wide bard radio cut-in system according to claim 1 is characterized in that: antenna element (122) adopts fan antenna or omnidirectional antenna.
3. base station device for wide bard radio cut-in system according to claim 1 and 2 is characterized in that: antenna element (122) adopts 6 fan antennas, is connected with 6 base station access units (111) are corresponding with it by 6 radio frequency units.
4. base station device for wide bard radio cut-in system according to claim 1, it is characterized in that: said backbone network interface, comprise 2 E1 circuit connecting interfaces and a 10MHZ Ethernet interface, and, the up link of air interface adopts the empty pattern of sending out, and down link adopts continuous mode.
5. base station device for wide bard radio cut-in system according to claim 1, it is characterized in that: said connection access unit (111) receives the intermediate frequency and the intermediate frequency of posting a letter with its multiplexing transmission of immediate frequency cable (13) of indoor unit (12), and power supply, pilot signal and frequency reference.
6. according to claim 1 or 3 described base station device for wide bard radio cut-in system, it is characterized in that: said access unit (111) comprises Network Interface Module (1111) and the fundamental module (1112) that is connected with two-way circuit
7. base station device for wide bard radio cut-in system according to claim 6, it is characterized in that: said Network Interface Module (1111) comprises business interface unit (11111) and the medium access control unit (11112) that becomes two-way circuit to connect respectively with it, main control unit (11113); Wherein, this business interface unit (11111) respectively with two E1 interfaces and two-way a connection of 10MHZ Ethernet interface poplar, the two-way connection serial ports of this main control unit (11113) RS232; This medium access control unit (11112) then becomes than connecting to circuit with base band ifd module (1112) respectively with main control unit (11113).
8. base station device for wide bard radio cut-in system according to claim 7, it is characterized in that: the main body of media control unit (11112) is a coprocessor (111121) in the Network Interface Module (1111), and, the main body of main control unit (11113) is a primary processor (111131), also is connected between them by a programmable logic units (111132).
9. base station device for wide bard radio cut-in system according to claim 8 is characterized in that: it is characterized in that: said coprocessor (111121) is the MPC8240 minimum system.
10. base station device for wide bard radio cut-in system according to claim 8 is characterized in that: said primary processor (111131) is the MPC860 minimum system.
11. base station device for wide bard radio cut-in system according to claim 6, it is characterized in that: said base band ifd module (1112) comprises into baseband processing unit (11121) and the intermediate frequency unit (11122) that two-way circuit connects, wherein, the two-way connection Network Interface Module of this baseband processing unit (11121) (1111); The IF interface that then connects radio frequency unit (121) to intermediate frequency unit (11122).
12. base station device for wide bard radio cut-in system according to claim 6, it is characterized in that: said base band blade unit (11121) comprises the data and the transmit block of descending continuous modulation system, the Data Receiving of uplink burst demodulation mode and demodulation parts, the modulator-demodulator (111218) of the monitoring communication of reference oscillation source (111217), connection and the outdoor unit (12) of transmission outdoor unit (12) and the modulator (111210) that connects with circuit successively, low pass filter (111211) and numerical control gain amplifier (111212); This Data Receiving and demodulation parts comprise tuner (111213), intermediate-frequency filter (111214), automatic gain intermediate frequency amplifier (111215) and the demodulator (111216) that connects with circuit successively.
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| WO2006094441A1 (en) * | 2005-03-07 | 2006-09-14 | Datang Mobile Communications Equipment Co., Ltd | Base station system |
| CN1305266C (en) * | 2003-12-19 | 2007-03-14 | 深圳国人通信有限公司 | Radio local area network cut-in point device based on embedded system |
| CN100358380C (en) * | 2005-03-11 | 2007-12-26 | 华为技术有限公司 | Indoor base station system |
| CN100369409C (en) * | 2005-07-14 | 2008-02-13 | 杭州华三通信技术有限公司 | Network equipment, supply unit of network equipment and method of power supply |
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| WO2006094441A1 (en) * | 2005-03-07 | 2006-09-14 | Datang Mobile Communications Equipment Co., Ltd | Base station system |
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| CN100459750C (en) * | 2005-05-24 | 2009-02-04 | 华为技术有限公司 | Device for connection baseband unit and middle frequency unit in base station system |
| CN100426721C (en) * | 2005-06-30 | 2008-10-15 | 华为技术有限公司 | Method and apparatus for throughly utilizing wideband wireless inserting equipment blank bandwidth |
| CN100369409C (en) * | 2005-07-14 | 2008-02-13 | 杭州华三通信技术有限公司 | Network equipment, supply unit of network equipment and method of power supply |
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