CN100477564C - Radio-frequency zoom-out module network and method for realizing data transmission using same - Google Patents
Radio-frequency zoom-out module network and method for realizing data transmission using same Download PDFInfo
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- CN100477564C CN100477564C CNB2004100306140A CN200410030614A CN100477564C CN 100477564 C CN100477564 C CN 100477564C CN B2004100306140 A CNB2004100306140 A CN B2004100306140A CN 200410030614 A CN200410030614 A CN 200410030614A CN 100477564 C CN100477564 C CN 100477564C
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Abstract
Key points of the invention are as follows. BB frame and more than one RRU constitute a ring net. Default route and protection route are setup for the ring net. Device in ring net receives data from own two receiving optical ports at same time, and receives data from default route. Device in ring net sends data through two sending optical ports to default route and protection route at same time by applying RRU net and method for transmitting data, no mater unidirectional or bi-directional fault happens at node in the ring net, the other RRU in ring net is still operated normally so as to raise reliability, and further to raise scale of net or number of node. The invention is applicable to 2G or 3G wireless communication system, or futural mobile communication system.
Description
Technical field
The present invention relates to wireless communication technology field, be meant a kind of radio frequency remoto module net especially and use the method that this net is realized transfer of data.
Background technology
Along with the development of wireless technology, the application of radio frequency remoto module (RRU, Radio Remote Unit) appears in the wireless system more and more.So-called radio frequency zooms out, and is meant radio-frequency apparatus to be placed on away from base band frame (BB frame) but near the position of transmitting antenna, and receives the base band data of BB frame by optical fiber.Figure 1 shows that the radio frequency remoto module schematic diagram.The radio frequency remoto module 103 that is made of IQ modulator 103a, filter 103b, digital-to-analogue (DA) transducer 103c and radio-frequency apparatus 104d receives the base band data behind frequency multiplier 102 spread spectrums from BB frame 101 by optical fiber, these data is launched by antenna 104 again.Like this, radio frequency remoto module not only can be shared baseband processing resource pond and the clockwork in the BB frame, brought abundant " soft " characteristic for the institute overlay area, and because radio-frequency apparatus can be to greatest extent near antenna, reduce the loss of feeder part, thereby improved the performance of wave point.
Along with the capacity of BB frame constantly enlarges, the number of the RRU that BB frame can connect is simultaneously also increasing, because the base band data flow is very big, so the reliability of networking between RRU and the BB frame is just more and more important.
Figure 2 shows that the application mode schematic diagram of a kind of RRU net of prior art.1～3 RRU of BB frame Y-connection in this RRU net forms the covering of 1～3 sector.This networking mode is mainly used in upstairs/downstairs, on the tower/and the inferior near-end of tower uses.
The shortcoming of above-mentioned networking mode is: owing to the distance that every optical fiber can transmit signal is limited, therefore, in above-mentioned star net forming mode, a plurality of RRU can only be limited in short-range scope and use.In addition, because the RRU number that connected of each BB frame is less, therefore the shared utilance to the base band resource pool of BB frame is also lower.
For addressing the above problem, taking as shown in Figure 3, the side of application shows.
Figure 3 shows that the application mode schematic diagram of the another kind of RRU net of prior art.After the base band data transmission interface carried out formal definition, carry out communication link protection between BB frame and the RRU.Each RRU communicates by this chain net and BB frame, and the BB frame can come the data separation from different RRUs at receiving terminal.This networking mode has extended the range of application of RRU networking greatly, has improved the quantity of a BB RRU that frame connects simultaneously, and then has improved the shared utilance of base-band resource.
But also there is following defective in above-mentioned networking mode: under this networking mode, reliability of data transmission is low, in case because any one link in this chain net breaks down, all RRU of its back cascade are with unavailable.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of radio frequency remoto module net and use the method that this net is realized transfer of data, to solve the integrity problem of RRU net.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of radio frequency remoto module net comprises base band BB frame and an above radio frequency remoto module RRU, and described BB frame and each RRU comprise that respectively two send Guang Kou and two reception light mouths, the BB frame links to each other with more than one RRU order successively by optical fiber, constitute the RRU looped network, wherein
Described BB frame, by two the transmission light mouths transmission of the RRU in the looped network simultaneously data of self, or light mouths from two reception light mouths receive the data from RRU;
Described RRU receives data from the BB frame from two light mouths that receive the light mouths, or sends the light mouths by self two and send data to the BB frame simultaneously.
Preferably, described BB frame directly links to each other with more than one RRU, or links to each other by the transmission equipment node in the transmission looped network.
Preferably, described transmission looped network is a SDH (Synchronous Digital Hierarchy) SDH transmission network, or the wave division multiplexing WDM transmission network.
Preferably, described transmission equipment node is add-drop multiplexer ADM.
Preferably, described add-drop multiplexer ADM is optical add/drop multiplexer OADM.
Preferably, described light mouth is determined transmission rate according to the number of RRU in the bandwidth of RRU needs and the looped network.
Use radio frequency remoto module net as claimed in claim 1 and realize the method for transfer of data, be provided with one that two in each equipment send in the light mouth in the RRU looped network and be acquiescence transmission light mouth, another sends the light mouth for protection, be provided with one that two in each equipment receive in the light mouth in the RRU looped network and be acquiescence reception light mouth, another receives the light mouth for protection, the path that is made of acquiescence light mouth is a default path, and the path that is made of protection light mouth is the protection path;
The method of the equipment receiving data in the RRU looped network is: the equipment in the RRU looped network receives the light mouth from two and receives data simultaneously, and judge whether the data in the default path are effective, if then directly receive the data in the default path, otherwise, be switched in the protection path and receive data;
The method of the equipment sending data in the RRU looped network is: the data that self is to be sent of the equipment in the RRU looped network send the default path of light mouth in looped network by two and the protection path sends data simultaneously.
Preferably; equipment in the described RRU looped network judges whether effective method is for data in the default path: the equipment in the RRU looped network judges at first whether the data message in the default path is identical with the information of expression invalid data; if not; then the data in this default path are effective; otherwise; judge again in this default path data message whether with the protection path in the data message that receives identical; if; then the data in this default path are effective; otherwise the data in this default path are invalid.
Preferably, this method further comprises: the corresponding radio frequency remoto module of each time slot in the pre-defined Frame with time division multiplexing structure, this Frame; Equipment in the described RRU looped network receives or sends data by the time division multiplexing frame.
Preferably, when the equipment in the described RRU looped network is RRU, described method of reseptance is: after RRU receives data in the fixedly time slot corresponding with self from default path and protection in the time division multiplexing frame the path, judge whether the data message in the default path is effective, if, then directly receive the data in the default path, otherwise, from the protection path, receive data; Described sending method is: after the RRU data that self is to be sent are inserted fixedly time slot corresponding with self in the time division multiplexing frame, this Frame is sent the default path of light mouth in looped network and protects the path to send data simultaneously by two; When the equipment in the described RRU looped network is the BB frame, described method of reseptance is: after receiving data in the time multiplexing date frame of BB frame from default path and protection path, judge whether the data message in the default path is effective, if, then directly receive the data in the default path, otherwise, from the protection path, receive data; Described sending method is: after self data of giving different RRUs to be sent is inserted different time-gap in the time multiplexing date frame, this Frame is sent the default paths of light mouths in looped network by two and the protection path sends simultaneously.
Preferably, when breaking down in the RRU looped network, receive the physical link warning information with equipment in the RRU looped network that the fault point directly links to each other.
Preferably, when the RRU in the looped network receives chain alarming information, the method that this RRU that receives chain alarming information sends data is: receiving on the loop of warning information, after all inserting invalid information in whole time slots with Frame, send this Frame to the link that receives warning information; Do not receiving on the loop of alarm, after the data that self is to be sent are inserted relevant position in the Frame, other time slot of this Frame all inserted invalid information after, send this Frame to the loop that does not receive alarm.
Preferably, described light mouth is determined transmission rate according to the number of RRU in the bandwidth of RRU needs and the looped network.
The present invention forms looped network with BB frame and more than one RRU, and default path is set and protects the path for this looped network.Equipment in the looped network receives data simultaneously from two the reception light mouths of self, and judges whether the data in the default path are effective, if, then directly receive the data in the default path, otherwise, be switched in the protection path and receive data; Equipment in the looped network data that self is to be sent send the default path of light mouth in looped network by two and the protection path sends data simultaneously.Use the method for RRU net of the present invention and transfer of data, no matter unidirectional or two-way fault takes place in certain node in the looped network, other RRU in this looped network still can operate as normal, thereby has improved the reliability of whole net, and then can improve the networking scale and the node number of RRU net.The present invention can be widely used in existing 2G or 3G wireless communication system, also can be used in following mobile communication system.
Description of drawings
Figure 1 shows that the radio frequency remoto module schematic diagram;
Figure 2 shows that the application mode schematic diagram of a kind of RRU net of prior art;
Figure 3 shows that the application mode schematic diagram of the another kind of RRU net of prior art;
Figure 4 shows that the schematic diagram of one embodiment when using BB frame of the present invention directly links to each other also proper communication with RRU;
Figure 5 shows that the schematic diagram the when RRU2 of looped network shown in Figure 4 and the bidirectional optical fiber link between the RRU3 break down simultaneously;
Schematic diagram when Figure 6 shows that the RRU2 of looped network shown in Figure 4 and the one-way optical fiber link occurs fault between the RRU3;
Figure 7 shows that and use the schematic diagram that the BB frame links to each other with RRU by the SDH transmission network in the RRU looped network of the present invention.
Embodiment
For making technical scheme of the present invention clearer, the present invention is done detailed description further again below in conjunction with drawings and the specific embodiments.
Thinking of the present invention is: BB frame and more than one RRU are formed looped network, and default path is set and protects the path for this looped network.Equipment in the looped network receives data simultaneously from two the reception light mouths of self, and judges whether the data in the default path are effective, if, then directly receive the data in the default path, otherwise, be switched in the protection path and receive data; Equipment in the looped network data that self is to be sent send the default path of light mouth in looped network by two and the protection path sends data simultaneously.The present invention can be widely used in existing 2G or 3G wireless communication system, also can be used in following mobile communication system.
For sake of convenience, below send the BB frame to RRU data be called downlink data, the data that RRU sent to the BB frame are called upstream data.
Figure 4 shows that the schematic diagram of one embodiment when using BB frame of the present invention directly links to each other also proper communication with RRU.For the BB frame is provided with two pairs of light mouths respectively with each RRU, promptly two send Guang Kou and two reception light mouths, to be used for transceive data in advance.Two of sending in the light mouth are set are acquiescence transmission light mouth; another sends the light mouth for protection; two of receiving in the light mouth are set are acquiescence reception light mouth; another receives the light mouth for protection; then the path that is made of acquiescence light mouth is a default path, and the path that is made of protection light mouth is the protection path.The transmission rate of light mouth is determined according to the number of RRU in the bandwidth of RRU needs and the looped network.Link to each other by optical fiber order successively between BB frame and an above RRU, constitute the RRU looped network.Under normal circumstances, BB frame and each RRU receive data from default path, and send data simultaneously to default path and protection path.
Referring to Fig. 4, in the present embodiment, 4 RRU are arranged, respectively corresponding RRU1～4.Pre-defined Frame with time division multiplexing structure makes a time slot in each RRU corresponding data frame, and promptly each RRU receives one's own downlink data in the fixedly time slot of this Frame, sends upstream data simultaneously in one's own time slot.On behalf of the BB frame, 1,2,3,4 in the data in graph form frame send to the downlink data of RRU1～4 respectively, 1., 2., 3., 4. represents RRU1～4 to send to the upstream data of BB frame respectively in the Frame.Solid line represents to transmit the default path of data among the figure, and dotted line represents to transmit the Data Protection path.Concrete communication process is as follows:
The BB frame is by two light mouths, after using predefined Frame with time division multiplexing structure data of giving different RRUs to be sent being inserted different time-gap in the time multiplexing date frame with self simultaneously on default path and protection path, send downlink data 1,2,3,4, after each RRU receives downlink data from two-way, judge whether the data in the default path are effective, if, then from the fixedly time slot of the Frame of default path, receive one's own downlink data, otherwise, in the fixedly time slot of the Frame of protecting the path, receive one's own downlink data, and after in one's own time slot, inserting upstream data to be sent, send the light mouths by self two and send upstream data simultaneously to default path and protection path; Correspondingly, the BB frame also can all be received the upstream data from RRU from two light mouths, and it judges also whether the data in the default path are effective, if, then receive upstream data from default path, otherwise, upstream data received from the protection path.And the BB frame can be distinguished the data from different RRUs that receive according to the definition of time multiplexing date frame.Be that BB frame and RRU in the whole looped network adopts the treatment mechanism of " dual transmitting and receiving ".
Above-mentionedly judge whether effective method is the data in the default path: judge that at first the data that receive are whether identical with the invalid condition code of expression data from default path; if not; illustrate that then the data in this default path are effective; otherwise; judge again whether the data that receive are identical with the data that receive from the protection path from default path; if it is identical; illustrate that then these data that receive from default path condition code invalid with representing data is identical in form; but it is an active data; otherwise, illustrate that these data that receive from default path are invalid datas.
When a certain section link in the looped network breaks down, whole looped network will become two strands and carry out transfer of data, thereby improve the reliability of RRU net.
Figure 5 shows that the schematic diagram the when RRU2 of looped network shown in Figure 4 and the bidirectional optical fiber link between the RRU3 break down simultaneously." X " in the Frame represents condition code, is used for representing that the data of this time slot are invalid, and usually, the expression mode of condition code X should be difficult for obscuring with the data of being transmitted.
Referring to Fig. 5; when the bidirectional optical fiber link between RRU2 and RRU3 breaks down simultaneously; RRU2 and RRU3 will receive the physical link warning information; this moment is because RRU3 can not receive any information from default path; therefore it is switched to protection path downlink data receiving; and for RRU2, the RX path of its acquiescence is not affected, so RRU2 downlink data receiving from the default path still.
Identical in order to guarantee that each RRU receives with the time delay that sends data, promptly in same path, finish in order to guarantee that each RRU receives with the transmission data, therefore receive the RRU of chain circuit alarming, receiving on the loop of alarm, after all inserting condition code X in whole time slots with Frame, send this Frame to the link that receives warning information; Do not receiving on the loop of alarm, after the data that self is to be sent are inserted the relevant position of Frame, other time slot of this Frame all inserted condition code X after, send this Frame to the link that does not receive alarm.That is to say that the process that RRU2 and RRU3 send data is: all time slots of data that RRU2 sends to RRU3 all are " X ", the data that RRU2 sends to RRU1 except the upstream data of RRU2 self 2., other time slots all are " X "; All time slots of data that RRU3 sends to RRU2 all are " X ", the data that RRU3 sends to RRU4 except the upstream data of RRU3 self 3., other time slots all are " X ".The purpose of doing like this is in order to guarantee that all RRU after the RRU3 switch to downlink data receiving on the protection path simultaneously from default path in the looped network.The path of up-downgoing data process that guarantees each RRU simultaneously is identical, thereby guarantees that the time-delay of up-downgoing transfer of data is identical.
For RRU4, it does not receive chain alarming information, but it has received " X " from default path, has received normal data " 4 " from the protection path.Because RRU checks judgement to the data on the receive path; therefore; it is identical with condition code to judge the downlink data information " X " that receives from default path at RRU4; and after the downlink data information that receives from default path is different with the downlink data information that receives from the protection path; then be switched to protection path downlink data receiving; and receiving downlink information from the protection path ever since; at this moment; protection path originally is set to default path; default path originally is set to protect the path after maintenance is good.Because RRU do not check content in the sendaisle or judges, therefore, RRU4 still in oneself sendaisle, insert upstream data to be sent 4. after, send upstream data by two transmission light mouths simultaneously to two paths.
For RRU1, it does not receive chain alarming information, and all receive and dispatch still normal mode processing.Be that RRU1 receives downlink data from two ports, after judging that downlink data effectively in the default path, directly receive data, and after 1. the upstream data that self is to be sent write the fixed position of Frame, send the light mouths by two and send upstream data simultaneously to two paths from default path.That is to say that the transmitting-receiving tupe of RRU1 is not affected.
For the BB frame; still receive the light mouth from two and receive data; after judging; on default path; received only on the corresponding time slot of RRU1 and RRU2 valid data 1. and 2.; 3. and 4. and the data of the corresponding time slot of RRU3, RRU4 are invalid, and at this moment the BB frame is switched to and receives RRU3,4 upstream data on the protection path.The processing of its sending direction does not change, promptly still self data of giving different RRUs to be sent is inserted the different time-gap in the time multiplexing date frame after, on default path and protection path, send downlink data simultaneously.
Schematic diagram when Figure 6 shows that the RRU2 of looped network shown in Figure 4 and the one-way optical fiber link occurs fault between the RRU3.In the present embodiment, suppose to have only the link of RRU3 receive direction that fault has taken place.Referring to Fig. 6, in the present embodiment, have only RRU3 on the acquiescence RX path, to receive physical link warning information this moment, so it is switched to protection path downlink data receiving because RRU3 can not receive any information from default path.
In these cases, the process that RRU3 sends data is: all time slots of data that RRU3 sends to RRU2 all are " X ", the data that RRU3 sends to RRU4 except the upstream data of RRU3 self 3., other time slots all are " X ".The purpose of doing like this is in order to guarantee that all RRU after the RRU3 switch to downlink data receiving on the protection path simultaneously from default path in the looped network.The path of up-downgoing data process that guarantees each RRU simultaneously is identical, thereby guarantees that the time-delay of up-downgoing transfer of data is identical.
For RRU4, it does not receive chain alarming information, but has received " X " from default path, has received normal data " 4 " from the protection path.RRU4 changes by protection path downlink data receiving " 4 " after judging.The processing of its sending direction does not change, promptly still in oneself sending time slots, insert upstream data to be sent 4. after, send upstream data by two transmission light mouths simultaneously to two paths.
For RRU2 and RRU1, it does not receive chain alarming information, and the transmitting-receiving of all data still normal mode is handled.
For the BB frame; still receive the light mouth from two and receive data; after judging; on default path; received only on the corresponding time slot of RRU1 and RRU2 valid data 1. and 2.; 3. and 4. and the data of the corresponding time slot of RRU3, RRU4 are invalid, and at this moment the BB frame is switched to and receives RRU3,4 upstream data on the protection path.The processing of its sending direction does not change, promptly still self data of giving different RRUs to be sent is inserted the different time-gap in the time multiplexing date frame after, on default path and protection path, send downlink data simultaneously.
Use the method for RRU net of the present invention and transfer of data, no matter unidirectional or two-way fault takes place in certain node in the looped network, other RRU in this looped network still can operate as normal, thereby has improved the reliability of whole net, and then can improve the networking scale and the node number of RRU net.
The above-mentioned network-building method situation that to be the BB frame directly link to each other with RRU, certainly, also can link to each other between BB frame and the RRU by the transmission equipment node in the transmission network, above-mentioned transmission network can be SDH (Synchronous Digital Hierarchy) (SDH) transmission network or wavelength division multiplexing (WDM) transmission network, and above-mentioned transmission equipment node can be add-drop multiplexer (ADM) or optical add/drop multiplexer (OADM).
Figure 7 shows that and use the schematic diagram that the BB frame links to each other with RRU by the SDH transmission network in the RRU looped network of the present invention.RRU in the RRU looped network is by the transmission equipment node, as ADM or OADM, from the downlink data of SDH transmission network reception from the BB frame, and the upstream data that self is to be sent sends on the SDH transmission network by the transmission equipment node, correspondingly, BB frame in the RRU looped network passes through the transmission equipment node from the upstream data of SDH transmission network reception from RRU, and comes in the data separation of receiving terminal with different RRUs.
Using looped network shown in Figure 7, to carry out the data transfer mode of data transmission manner when directly linking to each other with RRU with above-mentioned BB frame identical, in this no longer repeat specification.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1, a kind of radio frequency remoto module net, comprise base band BB frame and an above radio frequency remoto module RRU, it is characterized in that, described BB frame and each RRU comprise that respectively two send Guang Kou and two reception light mouths, the BB frame links to each other with more than one RRU order successively by optical fiber, constitute the RRU looped network, wherein
Described BB frame, by two the transmission light mouths transmission of the RRU in the looped network simultaneously data of self, or light mouths from two reception light mouths receive the data from RRU;
Described RRU receives data from the BB frame from two light mouths that receive the light mouths, or sends the light mouths by self two and send data to the BB frame simultaneously.
2, radio frequency remoto module net according to claim 1 is characterized in that, described BB frame directly links to each other with more than one RRU, or links to each other by the transmission equipment node in the transmission looped network.
3, radio frequency remoto module net according to claim 2 is characterized in that, described transmission looped network is a SDH (Synchronous Digital Hierarchy) SDH transmission network, or the wave division multiplexing WDM transmission network.
4, radio frequency remoto module net according to claim 2 is characterized in that, described transmission equipment node is add-drop multiplexer ADM.
5, radio frequency remoto module net according to claim 4 is characterized in that, described add-drop multiplexer ADM is optical add/drop multiplexer OADM.
6, radio frequency remoto module net according to claim 1 is characterized in that, described light mouth is determined transmission rate according to the number of RRU in the bandwidth of RRU needs and the looped network.
7, use the method that radio frequency remoto module net as claimed in claim 1 is realized transfer of data, it is characterized in that, be provided with one that two in each equipment send in the light mouth in the RRU looped network and be acquiescence transmission light mouth, another sends the light mouth for protection, be provided with one that two in each equipment receive in the light mouth in the RRU looped network and be acquiescence reception light mouth, another receives the light mouth for protection, and the path that is made of acquiescence light mouth is a default path, and the path that is made of protection light mouth is the protection path;
The method of the equipment receiving data in the RRU looped network is: the equipment in the RRU looped network receives the light mouth from two and receives data simultaneously, and judge whether the data in the default path are effective, if then directly receive the data in the default path, otherwise, be switched in the protection path and receive data;
The method of the equipment sending data in the RRU looped network is: the data that self is to be sent of the equipment in the RRU looped network send the default path of light mouth in looped network by two and the protection path sends data simultaneously.
8, method according to claim 7; it is characterized in that; equipment in the described RRU looped network judges whether effective method is for data in the default path: the equipment in the RRU looped network judges at first whether the data message in the default path is identical with the information of expression invalid data; if not; then the data in this default path are effective; otherwise; judge again in this default path data message whether with the protection path in the data message that receives identical; if; then the data in this default path are effective; otherwise the data in this default path are invalid.
9, method according to claim 7 is characterized in that, this method further comprises: the corresponding radio frequency remoto module of each time slot in the pre-defined Frame with time division multiplexing structure, this Frame; Equipment in the described RRU looped network receives or sends data by the time division multiplexing frame.
10, method according to claim 9 is characterized in that,
When the equipment in the described RRU looped network is RRU, described method of reseptance is: after RRU receives data in the fixedly time slot corresponding with self from default path and protection in the time division multiplexing frame the path, judge whether the data message in the default path is effective, if, then directly receive the data in the default path, otherwise, from the protection path, receive data; Described sending method is: after the RRU data that self is to be sent are inserted fixedly time slot corresponding with self in the time division multiplexing frame, this Frame is sent the default path of light mouth in looped network and protects the path to send data simultaneously by two;
When the equipment in the described RRU looped network is the BB frame, described method of reseptance is: after receiving data in the time multiplexing date frame of BB frame from default path and protection path, judge whether the data message in the default path is effective, if, then directly receive the data in the default path, otherwise, from the protection path, receive data; Described sending method is: after self data of giving different RRUs to be sent is inserted different time-gap in the time multiplexing date frame, this Frame is sent the default paths of light mouths in looped network by two and the protection path sends simultaneously.
11, method according to claim 10 is characterized in that, when breaking down in the RRU looped network, receives the physical link warning information with equipment in the RRU looped network that the fault point directly links to each other.
12, method according to claim 11, it is characterized in that, when the RRU in the looped network receives chain alarming information, the method that this RRU that receives chain alarming information sends data is: receiving on the loop of warning information, after all inserting invalid information in whole time slots with Frame, send this Frame to the link that receives warning information; Do not receiving on the loop of alarm, after the data that self is to be sent are inserted relevant position in the Frame, other time slot of this Frame all inserted invalid information after, send this Frame to the loop that does not receive alarm.
13, method according to claim 7 is characterized in that, described light mouth is determined transmission rate according to the number of RRU in the bandwidth of RRU needs and the looped network.
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| CN101425838B (en) * | 2007-10-30 | 2013-02-13 | 电信科学技术研究院 | Data channel configuration method and device |
| CN101436896B (en) * | 2007-11-13 | 2013-03-27 | 中兴通讯股份有限公司 | IQ data transmission method of radio frequency zooming unit |
| CN101286783B (en) * | 2008-05-21 | 2013-01-23 | 京信通信系统（中国）有限公司 | Digital RF remote system with movable working passband and method to move the working passband |
| CN101771591B (en) * | 2008-12-26 | 2011-09-28 | 大唐移动通信设备有限公司 | Service transmission method and system under RRU and BBU loop network |
| CN102014011A (en) * | 2009-09-04 | 2011-04-13 | 中兴通讯股份有限公司 | Method and system for protecting looped network |
| CN102984604A (en) * | 2011-09-02 | 2013-03-20 | 中兴通讯股份有限公司 | System and method for data interaction |
| CN106358202A (en) * | 2016-10-13 | 2017-01-25 | 北京邮电大学 | Improved C-RAN network architecture and resource dispatching method |
| CN108333398B (en) * | 2018-01-18 | 2020-06-09 | 研耀（上海）信息科技有限公司 | High energy-saving ammeter |
-
2004
- 2004-03-30 CN CNB2004100306140A patent/CN100477564C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2731273A1 (en) * | 2011-08-10 | 2014-05-14 | Huawei Technologies Co., Ltd | Multi-site cell networking method, base band unit, remote rf unit and system |
| EP2731273A4 (en) * | 2011-08-10 | 2014-06-18 | Huawei Tech Co Ltd | Multi-site cell networking method, base band unit, remote rf unit and system |
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