CN101436896B - IQ data transmission method of radio frequency zooming unit - Google Patents
IQ data transmission method of radio frequency zooming unit Download PDFInfo
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- CN101436896B CN101436896B CN2007101878225A CN200710187822A CN101436896B CN 101436896 B CN101436896 B CN 101436896B CN 2007101878225 A CN2007101878225 A CN 2007101878225A CN 200710187822 A CN200710187822 A CN 200710187822A CN 101436896 B CN101436896 B CN 101436896B
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Abstract
The invention discloses a method for transmitting IQ data of radio-frequency remote units, which achieves cascade transmission for the IQ data. The method cascades the radio-frequency remote units to a baseband pool unit in a chain mode, a carrier number occupied by the IQ data of each radio-frequency remote unit is distributed by the baseband pool unit, and the IQ data are organized and transmitted according to a frame format. Trough cascade of the radio-frequency remote units (RRU), the method increases coverage area of a base station, improves flexibility of network arrangement, and reduces selection difficulty of a machine room greatly.
Description
Technical field
The present invention relates to the 3G communication technology, specifically, relate to a kind of IQ data transmission method of Remote Radio Unit.
Background technology
Whole TD-SCDMA system is comprised of base station (Node B), radio network controller (RNC), core network system (CN) and travelling carriage (UE) four parts.Along with the development of wireless radio-frequency, the developing trend of base station is zoomed out middle radio frequency part by optical fiber in base band signal process is separated with middle radio frequency processing.In the base station (Node B), main control part and Base-Band Processing partly are referred to as BBU (Base Band Unit baseband pool unit), and Digital IF Processing and radio frequency part are referred to as RRU (Radio Remote Unit Remote Radio Unit).
Traditional way is RRU of a light mouth control and management of a BBU at present, and the limitation of this mode is a lot, is unfavorable for flexible networking on the one hand, and the increase in demand to the place has also increased cost to operator in addition.
Summary of the invention
Technical problem to be solved by this invention is the IQ data transmission method that is to provide Remote Radio Unit among the NODE-B in a kind of TD-SCDMA and WCDMA field, realizes a kind of cascade transmission to the IQ data.
In order to solve the problems of the technologies described above, the invention provides a kind of IQ data transmission method of Remote Radio Unit, Remote Radio Unit cascaded up in the chain mode be connected to baseband pool unit, the shared carrier number of IQ data of Remote Radio Unit at different levels is distributed by baseband pool unit, and the IQ data are organized according to frame format and transmitted.
In the said method, described Remote Radio Unit can be realized by extensive Field Programmable Gate Array.
In the said method, can be combined into a complete frame to the data of every grade of Remote Radio Unit according to frame format.
In the said method, the carrier number that every grade of Remote Radio Unit takies can not repeat.
In the said method, in the IQ data from the baseband pool unit to the Remote Radio Unit or the down direction from Remote Radio Unit at the corresponding levels to the rear class Remote Radio Unit: Remote Radio Unit at the corresponding levels can obtain the IQ data according to carrier number, local clock through phase-locked loop with the road clock synchronous after, the IQ data are converted to analog if signal launch, simultaneously the IQ data retransmission is arrived the rear class Remote Radio Unit;
In the IQ data from the Remote Radio Unit to the baseband pool unit or the up direction from Remote Radio Unit at the corresponding levels to the prime Remote Radio Unit: the IQ data of Remote Radio Unit at the corresponding levels can be converted to digital medium-frequency signal, local clock through phase-locked loop with the road clock synchronous after, the carrier number of occupying according to the corresponding levels and the position of the up frame head of Remote Radio Unit at the corresponding levels, the IQ data are inserted into corresponding carrier wave allocation position launch, simultaneously the IQ data retransmission is arrived the prime Remote Radio Unit.
Further, the IQ data communication device can be crossed pushup storage and carry out buffer memory, the clock jitter that causes to eliminate phase-locked loop.
And, in the described up direction, can be by the control of the forwarding enable signal that number produced by the local carrier of baseband pool unit configuration, the IQ data that IQ data and the rear class Remote Radio Unit of Remote Radio Unit at the corresponding levels sends over are transmitted respectively.
Compared with prior art, the inventive method consists of the chain type transmission by some grades of RRU are cascaded up in the mode of chain with BBU, finishes the function of Node B.By the cascade of remote radio and RRU, increased the area coverage of base station, improve the flexibility ratio of networking, greatly reduce the selection difficulty of machine room.
Description of drawings
Fig. 1 is the cascade model schematic diagram.
Fig. 2 is cascade transmit data flow direction schematic diagram.
Fig. 3 is rear class IQ data buffer storage RAM write address and writes the sequential chart that enables.
Fig. 4 is the sequential chart that rear class IQ data buffer storage RAM reads the address and reads to enable.
Embodiment
Below will cooperate drawings and Examples to describe embodiments of the present invention in detail, how the application technology means solve technical problem to the present invention whereby, and the implementation procedure of reaching technique effect can fully understand and implements according to this.
The present invention relates to the method for radio frequency remote unit RRU IQ data cascade transmission among the NODE-B in TD-SCDMA and WCDMA field.RRU of a BBU light mouth control and management in the prior art, the limitation of this mode is a lot, therefore thought of the present invention is to introduce concatenation technology, and a plurality of RRU that are linked togather by chain mode level just may be managed and control to the light mouth of such BBU.By the cascade of remote radio and RRU, just can increase the area coverage of base station, improve the flexibility ratio of networking, greatly reduce the city machine room of operator and select difficulty, reduce simultaneously engineering construction and maintenance difficulties.
What RRU the cascade of the IQ data of RRU of the present invention cascades up in the mode of chain, be connected with BBU with optical fiber, realizes the transmitting-receiving of IQ data, and BBU and RRU at different levels are linked together easily and reliably, finishes the function of Node B.Link topology is supposed 3 grades of cascades referring to Fig. 1, and RRU0 100 is connected on the BBU 10, and 110 grades of RRU1 are associated on the RRU0 100, and 120 grades of RRU2 are associated on the RRU1 110.Cascade transmit comprises both direction, and is namely descending and up, descendingly refers to data flow from BBU to RRU or from RRU at the corresponding levels to rear class RRU, RRU0 100 to RRU1 110 as shown in FIG.; Uply refer to data flow from RRU to BBU or the RRU from the RRU of rear class to prime, RRU1 110 to RRU0 100 as shown in FIG..
Data between BBU 10 and the RRU make up according to certain frame format, to finish the cascade transmit function, just must be combined into a complete frame to the data of every grade of RRU frame format according to the rules.In the middle of embodiments of the invention, transmission frame-form between RRU and the BBU 10 is take 10 milliseconds as unit, 10 milliseconds of frames are divided into 100 super bags (super-group), each super bag (super-group) comprises 8 bags, and each bag comprises again 16 attached bags (sub-group).The smallest vessel of IQ data is exactly a sub-group, the IQ data of 24 carrier waves have been carried among each sub-group, the position of the numbering of each carrier wave in sub-group fixed, concerning every one-level RRU, the carrier number that takies (numbering of carrier wave) is distributed by signaling by BBU 10, and the carrier number that the RRU of all cascades takies can not repeat.Concerning RRU, the IQ data are time-sharing multiplex in a sub-group so, so the forwarding of IQ data enables relevant with the carrier wave configuration.
As shown in Figure 2, take two RRU of cascade as embodiment, when uplink and downlink receive direction of the present invention is described, IQ data transfer method.RRU in the method for the invention realizes with extensive Field Programmable Gate Array (FPGA).Below respectively descending receive direction and uplink receiving direction are described.
In the descending receive direction, illustrate that at first RRU at the corresponding levels is in the processing that receives IQ data clock territory.Since the clock of receive data be from the light mouth recover with the road clock, and RRU at the corresponding levels extracts and the clock of forwarding IQ data is that the local crystal vibration produces, local clock is through phase-locked loop and with the road clock synchronous, the clock jitter that causes in order to eliminate phase-locked loop carries out caching process so the data that send over from BBU or prime RRU need to be passed through FIFO (pushup storage).
Then extraction and the forwarding of RRU at the corresponding levels IQ data in descending receive direction are described.After the FIFO processing, RRU at the corresponding levels is according to the carrier wave sequence number of BBU configuration, obtain the IQ data from the correspondence position of each sub-group, the processing in advanced row clock territory, export to DUC+D/A (Digital Up Convert chip and analog-digital chip), become analog if signal and deliver to radio-frequency module, go out finally by crossing antenna transmission; Simultaneously, all IQ data all are forwarded to rear class RRU.
In the uplink receiving direction, illustrate that at first RRU at the corresponding levels is to the update of IQ data.After the IQ data of RRU at the corresponding levels are received by the radio-frequency channel, be converted to digital signal through A/D (mould/number conversion chip), pass through again DDC (Digital Down Convert chip) and convert digital medium-frequency signal to and be sent among the FPGA.Through the conversion of clock zone, the carrier information that then occupies according to the corresponding levels of BBU configuration according to the position of the up frame head of RRU at the corresponding levels, is inserted into corresponding carrier wave allocation position to the IQ data in FPGA.
Then illustrate RRU at the corresponding levels in the uplink receiving direction to the IQ data that rear class RRU sends extract separately, storage and framing transmit, this process is divided into again following several step:
(1) conversion in rear class input IQ data clock territory
Equally also there is the problem of clock zone in the IQ data that rear class RRU comes, thus after entering FPGA, also to carry out caching process with FIFO first, and then carry out the framing transmission with local IQ data.The IQ data are carried out time-sharing multiplex in a sub-group, because there are certain time delay in reception frame head and the transmission frame head at the corresponding levels of coming from rear class, and this time delay integral multiple of sub-group not necessarily directly inserts among each sub-group so can not directly receive the IQ data that come to rear class.And will be sending out on the correct framing of IQ data of the IQ data of rear class and the corresponding levels, must be properly inserted in the IQ data that rear class is come in other carrier position of sub-group, therefore the rear class IQ data of coming are carried out buffer memory with a dual port RAM, and the size of buffer memory is the carrier data of 2 sub-group.Can carry out buffer memory with the data that the RAM resource of minimum is come to rear class like this.
(2) processing that enables of the read/write address of rear class IQ data buffer storage dual port RAM and read-write
Write address begins to calculate according to the frame head of rear class input, begins to produce the address counting when initial from sub-group, and full two sub-group are just passable for meter.As shown in Figure 3, write address begins to count from receiving frame head, and the IQ data of 24 carrier waves are arranged among each sub-group, so produce 48 write addresses (among the figure such as AD0～AD47), two sub-group, write address be altogether 96 (shown in the figure such as AD0～AD95).When producing write address, enable to be set to high level writing.
The position of the initial sub-group of rear class input IQ data hints obliquely at that correspondence also has a sub-group numbering in the transmission frame of the corresponding levels, take this sub-group as sign, delay a sub-group as read the address initial calculate to produce read the address.As shown in Figure 4, also be 48 addresses, a corresponding sub-group (as shown in the figure the corresponding sub-group (n) of AD0～AD47, the corresponding sub-group (n+1) of AD48～AD95).
It is different opportunity except the beginning that produces from write address to read the address, and all the other all are the same.Like this, produce first to produce behind the write address and read the address, just can be inserted into the IQ data of rear class RRU in the RRU frame of the corresponding levels reliably.The IQ data of rear class light mouth input through such dual port RAM conversion after, enable control by the IQ data retransmission, form a complete frame with the IQ data of the corresponding levels, send to previous stage RRU or BBU.
(3) transmit the generation that enables
Forwarding enables controlling the framing of data, supposes to transmit to enable to transmit the IQ data of RRU at the corresponding levels during low level for high level is to transmit the IQ data that rear class RRU sends over.According to number being produced by the local carrier of BBU configuration, when in a sub-group, if corresponding position is local carrier wave, transmits so and enable to be low level, remaining carrier position is high level.So just produced the forwarding enable signal.
Although the disclosed execution mode of the present invention as above, described content is not in order to limit.Have in any the technical field of the invention and usually know the knowledgeable, under the prerequisite that does not break away from the disclosed spirit and scope of the present invention, can do a little change and retouching in the details that reaches of implementing in form.Scope of patent protection of the present invention, still must with appending claims the person of being defined be as the criterion.
Claims (5)
1. the IQ data transmission method of a Remote Radio Unit is characterized in that:
Remote Radio Unit cascaded up in the chain mode is connected to baseband pool unit, and the shared carrier number of IQ data of Remote Radio Unit at different levels is distributed by baseband pool unit, and the IQ data are organized according to frame format and transmitted;
The IQ data are from the baseband pool unit to the Remote Radio Unit or from Remote Radio Unit at the corresponding levels the down direction to the rear class Remote Radio Unit: Remote Radio Unit at the corresponding levels obtains the IQ data of Remote Radio Unit at the corresponding levels according to carrier number, local clock through phase-locked loop with the road clock synchronous after, the IQ data of Remote Radio Unit at the corresponding levels are converted to analog if signal launch, simultaneously with all IQ data retransmissions to the rear class Remote Radio Unit;
The up direction of IQ data from Remote Radio Unit at the corresponding levels to the prime Remote Radio Unit: the IQ data of Remote Radio Unit at the corresponding levels are converted to digital medium-frequency signal, local clock through phase-locked loop with the road clock synchronous after, the carrier number of occupying according to the corresponding levels and the position of the up frame head of Remote Radio Unit at the corresponding levels, the IQ data of Remote Radio Unit at the corresponding levels are inserted into corresponding carrier wave allocation position launch, the IQ data retransmission that simultaneously the rear class Remote Radio Unit is sent is to the prime Remote Radio Unit; Or in the up direction of IQ data from the Remote Radio Unit to the baseband pool unit: the IQ data of Remote Radio Unit are converted to digital medium-frequency signal, local clock through phase-locked loop with the road clock synchronous after, the carrier number of occupying according to the corresponding levels and the position of the up frame head of Remote Radio Unit, the IQ data of Remote Radio Unit are inserted into corresponding carrier wave allocation position launch, the IQ data retransmission that simultaneously the rear class Remote Radio Unit is sent is to baseband pool unit;
In the described up direction, number produced by the local carrier of baseband pool unit configuration and to transmit enable signal, by transmitting the control of enable signal, the IQ data that IQ data and the rear class Remote Radio Unit of Remote Radio Unit at the corresponding levels sends over are transmitted respectively.
2. the method for claim 1 is characterized in that:
Described Remote Radio Unit is realized by extensive Field Programmable Gate Array.
3. the method for claim 1 is characterized in that:
The IQ data of every grade of Remote Radio Unit are combined into a complete frame according to frame format.
4. the method for claim 1 is characterized in that:
The carrier number that every grade of Remote Radio Unit takies does not repeat.
5. the method for claim 1 is characterized in that:
The IQ data communication device is crossed pushup storage carry out buffer memory, the clock jitter that causes to eliminate phase-locked loop.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101878225A CN101436896B (en) | 2007-11-13 | 2007-11-13 | IQ data transmission method of radio frequency zooming unit |
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| CN2007101878225A CN101436896B (en) | 2007-11-13 | 2007-11-13 | IQ data transmission method of radio frequency zooming unit |
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| CN101436896A CN101436896A (en) | 2009-05-20 |
| CN101436896B true CN101436896B (en) | 2013-03-27 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101707498B (en) * | 2009-10-20 | 2013-04-10 | 武汉虹信通信技术有限责任公司 | Device and method for realizing TD-SCDMA RRU multi-stage cascade function |
| CN103152766B (en) * | 2013-02-22 | 2016-01-20 | 大唐移动通信设备有限公司 | The monitor method of a kind of IR Interface Controller and administrative messag and system |
| CN104219020B (en) * | 2013-05-31 | 2019-10-11 | 中兴通讯股份有限公司 | Processing method, system and the Remote Radio Unit of the I/Q data of Remote Radio Unit |
| CN104639162A (en) * | 2013-11-12 | 2015-05-20 | 北京信威通信技术股份有限公司 | Parallel-connected multi-channel RRF (radio-frequency remote unit) device and local oscillator signal generating method thereof |
| CN103701717B (en) * | 2013-11-22 | 2017-09-29 | 北京邮电大学 | Cloud base station user data processing method, device and system |
| CN105490743A (en) * | 2014-09-16 | 2016-04-13 | 中国移动通信集团公司 | Link signal processing method, baseband processing device, and RRUs (radio remote units) |
| CN104539388B (en) * | 2014-12-08 | 2020-05-05 | 中兴通讯股份有限公司 | Data transmitting and receiving method and device |
| CN106034364B (en) * | 2015-03-12 | 2019-10-11 | 上海诺基亚贝尔股份有限公司 | Central baseband processing unit and the network architecture for indoor communication system |
| CN111106871B (en) * | 2019-12-13 | 2022-03-01 | 京信网络系统股份有限公司 | Data processing method, device, equipment and storage medium |
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| CN1677904A (en) * | 2004-03-30 | 2005-10-05 | 华为技术有限公司 | Radio-frequency zoom-out module network and method for realizing data transmission using same |
| CN1711789A (en) * | 2002-11-15 | 2005-12-21 | 艾利森电话股份有限公司 | Optical fiber coupling configurations for a main-remote radio base station and a hybrid radio base station |
| CN1774094A (en) * | 2004-11-08 | 2006-05-17 | 华为技术有限公司 | A radio base station system and its transmitting and receiving information method |
| CN1867119A (en) * | 2005-12-02 | 2006-11-22 | 华为技术有限公司 | Clock recovery method and apparatus in RF far-end module |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1711789A (en) * | 2002-11-15 | 2005-12-21 | 艾利森电话股份有限公司 | Optical fiber coupling configurations for a main-remote radio base station and a hybrid radio base station |
| CN1677904A (en) * | 2004-03-30 | 2005-10-05 | 华为技术有限公司 | Radio-frequency zoom-out module network and method for realizing data transmission using same |
| CN1774094A (en) * | 2004-11-08 | 2006-05-17 | 华为技术有限公司 | A radio base station system and its transmitting and receiving information method |
| CN1867119A (en) * | 2005-12-02 | 2006-11-22 | 华为技术有限公司 | Clock recovery method and apparatus in RF far-end module |
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