CN101730307A - Device and method for transmitting radio remote data - Google Patents
Device and method for transmitting radio remote data Download PDFInfo
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- CN101730307A CN101730307A CN200810173201A CN200810173201A CN101730307A CN 101730307 A CN101730307 A CN 101730307A CN 200810173201 A CN200810173201 A CN 200810173201A CN 200810173201 A CN200810173201 A CN 200810173201A CN 101730307 A CN101730307 A CN 101730307A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
Abstract
The invention discloses a device and a method for transmitting radio remote data, which are used for the data transmission between a baseband processing unit and a radio remote unit. One of two transmission ends is called as a sending end while the other is called as a receiving end. The method comprises the following steps of: multiplexing service data and control data, and/or the control data and signaling data to be transmitted into a user data packet by the sending end; encapsulating the user data packet into a RapiddIO data packet; sending the RapiddIO data packet; receiving the RapiddIO data packet by the receiving end; de-encapsulating the RapiddIO data packet to obtain the user data packet; and de-multiplexing the user data packet to obtain the service data, the control data and/or the signaling data, and performing transmission control according to the control data and/or the signaling data. The device and the method for transmitting the radio remote data greatly improve the reliability of IQ data transmission for a BBU+RRU framework of GSM and enhance the stability and reliability of the system.
Description
Technical field
The present invention relates to field of mobile communication, particularly a kind of radio frequency zooms out data transmission device and method.
Background technology
At present in field of mobile communication, the framework of baseband processing unit (BBU:Base Band Unit)+Remote Radio Unit (RRU:Remote Radio Unit) normally, the mode of the IQ data of transmitting between BBU and RRU has multiple, as adopt special-purpose CPRI (Common Public Radio Interface, common public radio interface) interface protocol, or adopt the agreement that oneself defines.Because the CPRI agreement is based on WCDMA (Wideband Code Division Multiple Access, Wideband Code Division Multiple Access (WCDMA)) forms on the basis, very unfriendly for GSM (Global System for Mobile Communications, global system for mobile communications) protocol compatibility.And the IQ data between the baseband processing unit internal module adopt high speed LVDS (Low Voltage Differential Signaling more, Low Voltage Differential Signal) transmit, the modes of a kind of Data Transport Protocol RapidIO based on the bag transmission means (input and output fast) that adopt are transmitted more between the processor of inside modules.There are the following problems for this framework:
1) in the transmission course of data, the form that needs the multiple conversions data, as from TDM (TimeDivision Multiplex, time division multiplexing) mode converts the form of CPRI to, become the form of TDM again from the format conversion of CPRI, become the form of RapidIO again from the format conversion of TDM, convert the form of TDM at last from RapidIO to, increase the complexity of system, reduced the reliability of system;
2) exchange of data need use the FPGA (Field-Programmable GateArray, field programmable gate array) of vast capacity to realize, has increased system cost;
3) transfer of data of the high speed LVDS between the module does not have enough link reliability safeguard measures, and the words that have also can only be come simple realization by FPGA, when transmission link goes wrong, can not carry out fault location apace;
4) the transmission data are to adopt synchronous mode between BBU and RRU, need the reference clock of between high quality, and clock is through long Distance Transmission, are very easy to be disturbed and make the error in data of transmission.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of radio frequency and zooms out data transmission device and transmission method, and this apparatus and method cost is low, reliability better, be easy to fault location.
In order to solve the problems of the technologies described above, the invention provides a kind of radio frequency and zoom out data transmission device, comprise transmission control module, user data processing module, RapidIO processing module, transport module, wherein: described transmission control module, be used to produce control data, send to the user data processing module, also be used for receiving control and/or signaling data, transmit control from the user data processing module; Described user data processing module, be used for receiving control data from transmission control module, with business datum waiting for transmission and signaling data, business datum and control data carry out the multiplexing business data packet that obtains, control data and signaling data carry out the multiplexing signaling data bag that obtains, business data packet and signaling data inclusion claim user data package, send to the RapidIO processing module; Also be used for carrying out demultiplexing from RapidIO processing module receiving subscriber data bag, acquisition business datum and control and/or signaling data will be controlled and/or signaling data sends to transmission control module; Described RapidIO processing module is used for being packaged into the RapidIO packet from user data processing module receiving subscriber data bag, sends to transport module; Also be used for receiving the RapidIO packet, carry out decapsulation and obtain user data package, send to the user data processing module from transport module; Described transport module is used for receiving the RapidIO packet and sending to far-end from the RapidIO processing module, also is used for receiving the RapidIO packet and being transferred to the RapidIO processing module from far-end.
Further, described RapidIO processing module further comprises RapidIO interchanger and RapidIO modular converter, wherein: the RapidIO modular converter, be used for from user data processing module receiving subscriber data bag, be packaged into the RapidIO packet, send to the RapidIO interchanger, also be used for receiving the RapidIO packet from the RapidIO interchanger, carry out decapsulation and obtain user data package, send to the user data processing module; The RapidIO interchanger is used for receiving the RapidIO packet from the RapidIO modular converter and intersects entirely, outputs to transport module, also is used for receiving the RapidIO packet from transport module and exchanges, and sends to the RapidIO modular converter.
Further, it is Remote Radio Unit that described radio frequency zooms out data transmission device, described radio frequency zooms out data transmission device and also comprises the rf data processing module, link to each other with described user data processing module, be used for launching from user data processing module reception business datum and by radio-frequency antenna, also be used for receiving business datum, be transferred to described user data processing module by radio-frequency antenna.
Further, it is baseband processing unit that described radio frequency zooms out data transmission device, and described transmission control module also produces synchronizing clock signals, and the described RapidIO processing module is encapsulated in described synchronizing clock signals in the RapidIO packet sends.
Further, when described RapidIO processing module encapsulates the RapidIO packet, described RapidIO packet comprises packet header, transmission control field and data field, and described transmission control field comprises control information transmission, and data field comprises business datum or signaling data.
The present invention also provides a kind of radio frequency to zoom out data transmission method, be used for the transfer of data between baseband processing unit and the Remote Radio Unit, one of the two ends that will transmit are called transmitting terminal, the other end is a receiving terminal, comprise: transmitting terminal is multiplexed into user data package with business datum waiting for transmission and control data and/or control data and signaling data; Described user data package is packaged into the RapidIO packet; Send described RapidIO packet; Receiving terminal receives described RapidIO packet; Described RapidIO packet is carried out decapsulation handle, obtain user data package; Described user data package is carried out demultiplexing handle, obtain business datum, control data and/or signaling data, transmit control according to described control data and/or signaling data.
Further, described RapidIO packet comprises packet header, transmitting control data field and data field, and described transmission control field comprises control information transmission, and data field comprises business datum or signaling data.
Further, described transmission control field comprises one or more in frame number, data type, time slot mark, IQ Data Identification, the data length, and wherein, frame number is meant the frame number of the frame that the data in this packet are affiliated; What this packet of data types to express carried is business datum, signaling data or control data; Time slot mark represents the data in this packet belong to which time slot in certain frame; The IQ Data Identification represents that the IQ data in this packet belong to the data of which sampled point in certain burst.
Further, when described transmitting terminal is baseband processing unit, described baseband processing unit also produces synchronizing clock signals, described synchronizing clock signals is encapsulated in the RapidIO packet sends to receiving terminal, and receiving terminal receives this RapidIO data packet recovery and goes out synchronizing clock signals.
Further, when described receiving terminal was Remote Radio Unit, described receiving terminal was launched described business datum by radio-frequency antenna.
Adopt the method for the invention and device, compared with prior art, make the IQ reliability of data transmission of the BBU+RRU framework of GSM obtain huge advance made, reached the stability of enhanced system and the effect of reliability, save system cost, improved data transmission efficiency.
Description of drawings
Fig. 1 is that a kind of radio frequency of the present invention zooms out the data transmission device block diagram;
Fig. 2 is that radio frequency of the present invention zooms out RapidIO data packet format schematic diagram in the transfer of data;
Fig. 3 is the process chart that a kind of radio frequency of the present invention zooms out transfer of data;
Fig. 4 is that another embodiment of the present invention radio frequency zooms out the data transmission device block diagram.
Embodiment
A kind of radio frequency of the present invention zooms out data transmission device as shown in Figure 1, comprises BBU and RRU.BBU and RRU all comprise transport module, RapidIO processing module, user data processing module and transmission control module, wherein:
Transmission control module is used to receive control and/or signaling data from the user data processing module, transmits control and treatment; Also be used for the needs according to transmission control, produce control data, send to the user data processing module, control data comprises: the happen suddenly data length etc. of timeslot number, IQ data sampling period, transmission of eating dishes without rice or wine under IQ data frame number, the IQ data;
The user data processing module, be used to receive the control data of transmission control module, with business datum waiting for transmission and signaling data, business datum and control data carry out the multiplexing business data packet that obtains, control data and signaling data carry out the multiplexing signaling data bag that obtains, business data packet and signaling data inclusion claim user data package, send to the RapidIO processing module then; Also be used to receive the user data package after the RapidIO processing module is handled, isolate business datum, control data and/or signaling data, processing service data, and control data, signaling data be distributed to transmission control module and handle;
The RapidIO processing module, be used for from user data processing module receiving subscriber data bag, carry out the RapidIO protocol processes, be packaged into the RapidIO packet, and the RapidIO packet is sent to transport module transmit, also be used for receiving far-end RapidIO packet, and carry out the RapidIO protocol processes from transport module, promptly carry out the RapidIO decapsulation and handle, the user data package that obtains after handling is sent to the user data processing module;
Transport module, the physical signalling that is used for transmission process RapidIO protocol processes between BBU and RRU, and the synchronised clock that needs between BBU and the RRU, link to each other with the RapidIO processing module, receive the RapidIO packet and send from the RapidIO processing module, perhaps receive far-end RapidIO packet, send the RapidIO processing module to.
If Remote Radio Unit, then except that comprising above-mentioned each module, also comprise the rf data processing module, link to each other with the user data processing module, be used for launching from user data processing module reception business datum and by radio-frequency antenna, also be used for receiving business datum, be transferred to the user data processing module by radio-frequency antenna.
Wherein, the user data processing module of BBU receives business datum waiting for transmission and signaling data from base station controller, and the user data processing module of RRU receives business datum waiting for transmission from the rf data processing module.
The transmission control module of BBU also is used to produce the aerial synchronizing clock signals of RRU needs, sends to the RapidIO processing module; The RapidIO processing module is encapsulated in synchronizing clock signals in the RapidIO packet and sends, and the RapidIO processing module of receiving terminal is carried out decapsulation, recovers synchronizing clock signals, sends to transmission control module;
Synchronised clock transmits in the mode of packet, and the RapidIO priority of data packets of synchronised clock is the highest; Transmitting terminal produces synchronizing clock signals, is encapsulated in the RapidIO packet to send, and after receiving terminal is received this RapidIO packet that comprises synchronizing clock signals, recovers the synchronizing clock signals of 0101.....
It is that form with the RapidIO packet is transmitted that data zoom out in the link at radio frequency, and each packet is divided into types such as business data packet, signaling packet, controlling packet according to the difference of content, wherein:
Business data packet is carried on the user service data (as speech data, media stream data etc.) that exchanges between baseband processing unit and the Remote Radio Unit, i.e. user plane information;
Need the signaling that exchanges between signaling packet carrying BBU and the RRU;
It is chain of command information that controlling packet needing between BBU and the RRU to be used for the information of other type of transmitting, the initialization information that need between BBU and RRU, exchange during as the bearing system electrifying startup, and system will change the configuration data that configuration the time exchanges etc. between BBU and RRU.
The form of RapidIO packet comprises packet header, transmission control field and data field as shown in Figure 2, wherein:
Packet header is that the RapidIO processor adds automatically, comprises type, destination address, source address etc.;
The transmission control field comprises control information transmission, specifically comprise frame number, data type, time slot mark, IQ Data Identification and data length, wherein, frame number is meant the frame number of TDMA (the Time Division/Demand Multiple Access) frame under the data in this packet; What this packet of data types to express carried is business datum, signaling data or control data; Time slot mark represents the data in this packet belong to which time slot in certain tdma frame; The IQ Data Identification represents that the IQ data in this packet belong to the data of which sampled point in certain burst; Data length refers to the length of valid data in the packet;
Data field comprises real wireless port service data, signaling data or control data.
Transmission control module is handled the content of transmission control field, filling, parsing as tdma frame number, according to what will transmit is the value that business datum or control data or signaling data come the specified data type field, and other is used to guarantee the correct content transmitted of business datum as timeslot number, IQ data sampling period etc.
The present invention also provides a kind of radio frequency to zoom out data transmission method, be used for transmitting data between baseband processing unit and Remote Radio Unit, Remote Radio Unit and the Remote Radio Unit, as shown in Figure 3, down direction, data are transferred to Remote Radio Unit from baseband processing unit, comprise:
For example, BBU receives business datum and signaling data from base station controller, produces control data by transmission control module.
The RapidIO packet that step 304, transport module receive the output of RapidIO processing module carries out opto-electronic conversion, with the form of light signal RapidIO is transferred to far-end RRU;
Wherein, when powering in system, the RapidIO processing module under the BBU sends the RapidIO broadcast packet automatically, determines the BBU and the RRU topological structure of system configuration, for each the RapidIO processing module in the system is distributed a unique address.
The topological structure of having determined system has also distributed after the address for each RapidIO processing module, and the RapidIO processing module under the BBU begins initialization procedure.RapidIO processing module under the BBU receives the frame number of initial tdma frame from transmission control module, and this initial frame number is transferred to transmission control module under all RRU by controlling packet, this initial frame number is used for the data packet transmission between synchronous BBU and the RRU.
The process that transfers data to BBU from RRU similarly, wherein, the rf data processing module of RRU receives business datum by radio-frequency antenna, send to the user data processing module, transmission control module produces control data, send to the user data processing module, the user data processing module is carried out multiplexing to business datum, signaling data and/or control data, obtain user data package, send to the RapidIO processing module and be packaged into the RapidIO packet and be transferred to BBU through transport module, BBU carries out processing such as demultiplexing, decapsulation again.
Fig. 4 is a kind of embodiment of the present invention, and wherein the RapidIO processing module is made up of two parts, RapidIO interchanger and RapidIO modular converter, and wherein, the RapidIO interchanger adopts the RapidIO switching network to realize the exchange of RapidIO packet; The RapidIO modular converter is examined now by the RapidIO among the FPGA is soft, is used to realize the format conversion between RapidIO packet and the tdm data (perhaps other communication system datas).
User data processing module and transmission control module are realized by FPGA.
Transport module adopts a slice optical module to realize the opto-electronic conversion of signal, realizes the transmission of zooming out of data.
For the data of down direction, the user data processing module at BBU place is handled business datum and the signaling data from base station controller.Transmission control module produces control data, comprises data type, frame number, timeslot number, IQ Data Identification, IQ data length, RRU address etc., and gives the user data processing module with these message transmission.The user data processing module is multiplexed into user data package with business datum, control data and the signaling data that receives.
User data after multiplexing wraps in the FPGA internal transmission and carries out the RapidIO protocol processes for the soft nuclear of RapidIO (realizing RapidIO modular converter function), user data package is encapsulated in the RapidIO packet, the RRU address that transmits according to the user data module produces the RapidIO packet packet header and the CRC check bytes such as RapidIO device address of RapidIO packet, after carrying out processing such as the cutting of RapidIO data, assembling as required, produce the RapidIO packet and send to the RapidIO interchanger and intersect entirely.
After the RapdIO interchanger receives the RapidIO packet, according to the RapidIO device address in the RapidIO packet, output to optical module (being transport module) from the port of appointment, optical module becomes light signal with the electrical signal conversion of input, by the RRU unit of Optical Fiber Transmission to far-end.
The optical module of RRU unit is converted into the signal of telecommunication with the light signal that receives and obtains the RapidIO packet, and sends to the RapidIO interchanger and exchange.The soft nuclear of RapidIO that sends to appointment through the RapidIO packet after the exchange carries out the processing that RapidIO unpacks, and recovers user data package.
User data package after the recovery is sent into the demultiplexing processing that the user data processing module is carried out data, the data decomposition in the user data package is become user's business datum, control data and signaling data.
The user data processing module sends to transmission control module with control data and transmits control and treatment, business datum is sent to launch by antenna after the rf data processing module is passed through intermediate frequency, radio frequency processing.
Finish the transmission that the gsm system rf data zooms out by said process.
The processing of up direction and descending similar.
In the above-mentioned explanation, be that example describes with gsm system TMDA frame, but the present invention is not limited to this, also is applicable to other radio frames of other wireless communication systems.
The method of the invention has following advantage:
1) do not need to carry out repeatedly format conversion, after the data acquisition of eating dishes without rice or wine of RRU, convert at once the form of RapidIO to, DSP directly receives the data of RapidIO form in baseband processing unit, and processes; Do not need between RapidIO and the TDM, the multiple conversions between TDM and the CPRI;
2) can adopt the little many FPGA of capacity that are compared with existing technology needs, relative low price. Existing Technical Architecture adopts FPGA to finish the swap operation of the TDM mode of data, need a large amount of memory cell to be used for transmitting-receiving, storage, separation, exchange, the forwarding of data, existing framework is to finish by the packet switch of RapidIO, and FPGA only need to finish other some work except the data exchange.
3) be easy to carry out fault location, when error code occurring in the transmission, the RapidIO consultation automatically carries out error detection, repeating transmission and reports the position of out of order device;
4) synchronised clock usage data bag transmission of the present invention realizes, does not need transmission reference clock between the special hardware timing means.
Adopt the method for the invention and device, compared with prior art, make the reliability of IQ transfer of data of the BBU+RRU framework of GSM obtain huge advance made, reached the effect that strengthens Systems balanth and reliability, save system cost, improved data transmission efficiency.
Claims (10)
1. a radio frequency zooms out data transmission device, it is characterized in that, comprises transmission control module, user data processing module, RapidIO processing module, transport module, wherein:
Described transmission control module is used to produce control data, sends to the user data processing module, also is used for receiving control and/or signaling data from the user data processing module, transmits control;
Described user data processing module, be used for receiving control data from transmission control module, with business datum waiting for transmission and signaling data, business datum and control data carry out the multiplexing business data packet that obtains, control data and signaling data carry out the multiplexing signaling data bag that obtains, business data packet and signaling data inclusion claim user data package, send to the RapidIO processing module; Also be used for carrying out demultiplexing from RapidIO processing module receiving subscriber data bag, acquisition business datum and control and/or signaling data will be controlled and/or signaling data sends to transmission control module;
Described RapidIO processing module is used for being packaged into the RapidIO packet from user data processing module receiving subscriber data bag, sends to transport module; Also be used for receiving the RapidIO packet, carry out decapsulation and obtain user data package, send to the user data processing module from transport module;
Described transport module is used for receiving the RapidIO packet and sending to far-end from the RapidIO processing module, also is used for receiving the RapidIO packet and being transferred to the RapidIO processing module from far-end.
2. device as claimed in claim 1 is characterized in that, described RapidIO processing module further comprises RapidIO interchanger and RapidIO modular converter, wherein:
The RapidIO modular converter, be used for from user data processing module receiving subscriber data bag, be packaged into the RapidIO packet, send to the RapidIO interchanger, also be used for receiving the RapidIO packet from the RapidIO interchanger, carry out decapsulation and obtain user data package, send to the user data processing module;
The RapidIO interchanger is used for receiving the RapidIO packet from the RapidIO modular converter and intersects entirely, outputs to transport module, also is used for receiving the RapidIO packet from transport module and exchanges, and sends to the RapidIO modular converter.
3. device as claimed in claim 1, it is characterized in that, it is Remote Radio Unit that described radio frequency zooms out data transmission device, described radio frequency zooms out data transmission device and also comprises the rf data processing module, link to each other with described user data processing module, be used for also being used for receiving business datum, be transferred to described user data processing module by radio-frequency antenna from user data processing module reception business datum and by the radio-frequency antenna emission.
4. device as claimed in claim 1, it is characterized in that, it is baseband processing unit that described radio frequency zooms out data transmission device, and described transmission control module also produces synchronizing clock signals, and the described RapidIO processing module is encapsulated in described synchronizing clock signals in the RapidIO packet sends.
5. device as claimed in claim 1, it is characterized in that, when described RapidIO processing module encapsulates the RapidIO packet, described RapidIO packet comprises packet header, transmission control field and data field, described transmission control field comprises control information transmission, and data field comprises business datum or signaling data.
6. a radio frequency zooms out data transmission method, is used for the transfer of data between baseband processing unit and the Remote Radio Unit, and one of the two ends that will transmit are called transmitting terminal, and the other end is a receiving terminal, it is characterized in that, comprises:
Transmitting terminal is multiplexed into user data package with business datum waiting for transmission and control data and/or control data and signaling data;
Described user data package is packaged into the RapidIO packet;
Send described RapidIO packet;
Receiving terminal receives described RapidIO packet;
Described RapidIO packet is carried out decapsulation handle, obtain user data package;
Described user data package is carried out demultiplexing handle, obtain business datum, control data and/or signaling data, transmit control according to described control data and/or signaling data.
7. method as claimed in claim 6 is characterized in that, described RapidIO packet comprises packet header, transmitting control data field and data field, and described transmission control field comprises control information transmission, and data field comprises business datum or signaling data.
8. method as claimed in claim 6, it is characterized in that, described transmission control field comprises one or more in frame number, data type, time slot mark, IQ Data Identification, the data length, and wherein, frame number is meant the frame number of the frame that the data in this packet are affiliated; What this packet of data types to express carried is business datum, signaling data or control data; Time slot mark represents the data in this packet belong to which time slot in certain frame; The IQ Data Identification represents that the IQ data in this packet belong to the data of which sampled point in certain burst.
9. method as claimed in claim 6, it is characterized in that, when described transmitting terminal is baseband processing unit, described baseband processing unit also produces synchronizing clock signals, described synchronizing clock signals is encapsulated in the RapidIO packet sends to receiving terminal, receiving terminal receives this RapidIO data packet recovery and goes out synchronizing clock signals.
10. method as claimed in claim 6 is characterized in that, when described receiving terminal was Remote Radio Unit, described receiving terminal was launched described business datum by radio-frequency antenna.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810173201A CN101730307A (en) | 2008-10-24 | 2008-10-24 | Device and method for transmitting radio remote data |
| PCT/CN2009/073374 WO2010045820A1 (en) | 2008-10-24 | 2009-08-20 | Transmission device and transmission method for remote radio data |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810173201A CN101730307A (en) | 2008-10-24 | 2008-10-24 | Device and method for transmitting radio remote data |
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| CN101730307A true CN101730307A (en) | 2010-06-09 |
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| WO (1) | WO2010045820A1 (en) |
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| CN101931540A (en) * | 2010-07-20 | 2010-12-29 | 新邮通信设备有限公司 | Radio remote unit |
| CN102065008A (en) * | 2010-12-16 | 2011-05-18 | 华为技术有限公司 | Data transmission method, radio remote unit, station and communication system |
| CN102149104A (en) * | 2011-03-08 | 2011-08-10 | 京信通信系统（中国）有限公司 | RRU (remote radio unit) microwave transmission transformation method and device as well as RRU microwave transmission system |
| WO2012083718A1 (en) * | 2010-12-21 | 2012-06-28 | 华为技术有限公司 | Method for generating downlink baseband signal, and related device and system |
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| KR20070069731A (en) * | 2005-12-28 | 2007-07-03 | 삼성전자주식회사 | Apparatus and method for communication between digital unit and remote rf unit in broadband wireless communication system bts |
| KR101292580B1 (en) * | 2007-01-22 | 2013-08-12 | 삼성전자주식회사 | Apparatus and method for communication between digital unit and remote rf unit in broadband wireless communication system bts |
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- 2009-08-20 WO PCT/CN2009/073374 patent/WO2010045820A1/en active Application Filing
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| CN101931540A (en) * | 2010-07-20 | 2010-12-29 | 新邮通信设备有限公司 | Radio remote unit |
| CN102065008A (en) * | 2010-12-16 | 2011-05-18 | 华为技术有限公司 | Data transmission method, radio remote unit, station and communication system |
| WO2012083718A1 (en) * | 2010-12-21 | 2012-06-28 | 华为技术有限公司 | Method for generating downlink baseband signal, and related device and system |
| US8705483B2 (en) | 2010-12-21 | 2014-04-22 | Huawei Technologies Co., Ltd. | Downlink baseband signal generating method, relevant device and system |
| CN102149104A (en) * | 2011-03-08 | 2011-08-10 | 京信通信系统（中国）有限公司 | RRU (remote radio unit) microwave transmission transformation method and device as well as RRU microwave transmission system |
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| CN104144529B (en) * | 2013-05-10 | 2017-11-21 | 中国移动通信集团公司 | A kind of remote radio unit (RRU), Base Band Unit and distributed base station |
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| WO2016090869A1 (en) * | 2014-12-08 | 2016-06-16 | 中兴通讯股份有限公司 | Method and device for data transmission and receiving |
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| CN111600638A (en) * | 2015-10-30 | 2020-08-28 | 松下电器（美国）知识产权公司 | Transmitting apparatus |
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| US10348408B2 (en) | 2016-06-21 | 2019-07-09 | Datang Mobile Communications Equipment Co., Ltd | Method and apparatus for transmitting frame data between near-end device and remote device |
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| WO2010045820A1 (en) | 2010-04-29 |
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