CN103326783B

CN103326783B - A kind of method for transmitting signals and relevant device and signal transmission system

Info

Publication number: CN103326783B
Application number: CN201210081711.7A
Authority: CN
Inventors: 齐江; 王自强
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2012-03-23
Filing date: 2012-03-23
Publication date: 2016-08-17
Anticipated expiration: 2032-03-23
Also published as: CN103326783A

Abstract

The embodiment of the invention discloses a kind of method for transmitting signals and relevant device and signal transmission system, transmit for realizing the signal of REC and RE, solve existing REC and need, with the link transmitting signal between RE, the problem that number of fibers is big, construction costs is high, do not result in interfering between each RE.One of them method includes: REC broadcast downstream signal is to beam splitter, so that beam splitter is to multiple RE broadcast downstream signals, it is connected by optical fiber between REC with beam splitter, beam splitter is individually connected with each RE by optical fiber respectively, downstream signal includes multiple descending subsignal, each descending subsignal carries a lower line identifier, and lower line identifier is for representing which RE a descending subsignal is belonging to, and the clock of multiple RE keeps Tong Bu with the clock of REC respectively；Each RE passes through beam splitter and the optical fiber being connected between oneself respectively, receives one's own descending subsignal according to lower line identifier from downstream signal.

Description

A kind of method for transmitting signals and relevant device and signal transmission system

Technical field

The present invention relates to communication technical field, particularly relate to a kind of method for transmitting signals and relevant device and letter Number transmission system.

Background technology

Distributed base station is just becoming the prevailing model of base station equipment, baseband processing unit (BBU, Base at present Band Unit) and Remote Radio Unit (RRU, Remote Radio Unit) between carried out by optical fiber Connecting, a BBU can support multiple RRU.Distribution-type base station architecture have volume little, low in energy consumption, The features such as flexible for installation, rapid deployment, can meet different capabilities, the application demand of different scene.

In current various standard wireless network, BBU is different with the fiber-optic transfer interface standard between RRU, Occupy marking for common public radio interface (CPRI, Common Public Radio Interface) of main flow Standard, there is also similar open baseband radio interface (OBRI/IR, the Open BBU RRH of same CPRI Interface/Interface between the RRU and the BBU) standard, the same CPRI of its ultimate principle Similar.RRU is a kind of wireless device (RE, Radio Equipment), is typically mounted on outdoor, relatively Needing device upgrade less, BBU is a kind of radio equipment controller (REC, Radio Equipment Control), its structure is complicated, needs frequently to carry out software upgrading and real-time servicing, by RE at far-end Dispose, REC can be concentrated in together and be managed, it is possible to effectively reduce wireless O&M difficulty, letter Change the requirement of wireless site, meet operator and concentrate the networking requirement disposed.

Under the long-distance optical fiber of more than 20km transmits, between REC and RE, there is multiple network topology knot Structure, such as point-to-point connection, chain connection, annular connection etc..Illustrate as a example by CPRI standard, please Refering to shown in Fig. 1, in point-to-point connection, a REC can support RE, REC and a RE Between connected by optical fiber；In chain connects, a REC can support that multiple RE (shows in Fig. 1 Having gone out two RE is RE1 and RE2 respectively), be connected by optical fiber between REC with RE1, RE1 with Connected by optical fiber between RE2；In annular connects, a REC can support multiple RE (Fig. 1 In show that two RE are RE3 and RE4 respectively), be connected by optical fiber between REC with RE3, RE3 It is connected by optical fiber with between RE4, is connected by optical fiber between RE4 with REC.

The inventors found that prior art at least exists following defect: although between REC is with RE Optical fiber link supports multiple network topological structure, but REC is with between the RE that is joined directly together or RE With the most only supporting between RE that point-to-point optical fiber connects.By distance light between REC/RE is with RE In the case of fine transmission, for existing point-to-point connection, owing to each RE is individually and between REC Constitute point-to-point connection, need when the quantity of RE is more multifiber individually to carry out a little with REC Connection to point, the number of fibers of needs is big, and construction costs is high；Existing chain is connected, although One REC supports multiple RE, but RE is still individually and constitute point-to-point between REC Connecting, the connection between RE and RE is also single point-to-point connection, relative to composition equal number The point-to-point connection of RE can save number of fibers, reduce construction costs, but when middle RE occurs During fault, the communication service between all RE and REC in downstream can be caused to interrupt, affect this business system The normal operation of system, and when network upgrade needs to increase RE, need to take whole chain connecting link apart, The normal communications traffic of this RE being necessarily required in broken link；Existing annular is connected, due to Also needing between REC and RE constitute annular networking, the chain relative to the RE of composition equal number connects, Its number of fibers needed needs to double, and the number of fibers of needs is big, and construction costs is high.

Summary of the invention

Embodiments provide a kind of method for transmitting signals and relevant device and signal transmission system, use In realizing signal transmission between REC and RE, solve existing REC with the chain transmitting signal between RE Road needs the problem that number of fibers is big, construction costs is high, and does not results in interfering between each RE.

On the one hand, a kind of method for transmitting signals that the embodiment of the present invention provides, including:

Radio equipment controller REC broadcast downstream signal is to beam splitter, so that described beam splitter is to multiple nothings Line equipment RE broadcasts described downstream signal, passes through light between described radio equipment controller and described beam splitter Fine connection, described beam splitter is individually connected with each wireless device by optical fiber respectively, described downstream signal Including multiple descending subsignal, each descending subsignal carries a lower line identifier, described under Line identifier is for representing that a descending subsignal is belonging to which wireless device, the plurality of wireless device Clock respectively with the clock of described radio equipment controller keep Tong Bu；

Each wireless device described passes through described beam splitter and the optical fiber being connected between oneself respectively, according to institute State lower line identifier from described downstream signal, receive one's own descending subsignal.

On the other hand, the another kind of method for transmitting signals that the embodiment of the present invention provides, including:

Beam splitter receives the downstream signal of radio equipment controller REC broadcast, described radio equipment controller Being connected by optical fiber with between described beam splitter, described downstream signal includes multiple descending subsignal, often One descending subsignal all carries a lower line identifier, and described lower line identifier is for representing a descending son Signal is belonging to which wireless device RE's；

Described beam splitter is to downstream signal described in multiple broadcast by wireless devices, so that the plurality of wireless device From described downstream signal, one's own descending subsignal is received respectively according to described lower line identifier, described Beam splitter is individually connected with each wireless device by optical fiber respectively, and the clock of the plurality of wireless device divides Do not keep Tong Bu with the clock of described radio equipment controller.

Each wireless device RE respectively by beam splitter and the optical fiber that is connected between oneself by each up son Signal is sent to described beam splitter, so that each up subsignal described is transferred to wireless by described beam splitter Device controller REC, is connected by optical fiber between described radio equipment controller with described beam splitter, institute Stating beam splitter to be individually connected with each wireless device by optical fiber respectively, each up subsignal carries Having a upper line identifier and a physical layer bursts expense, described upper line identifier is for representing a up son Signal is which wireless device sends, and described physical layer bursts expense is used for realizing described each and wireless sets Standby clock is synchronization with the clock of described radio equipment controller；

Described radio equipment controller is by being connected between described beam splitter with described radio equipment controller Optical fiber receives each up subsignal that described beam splitter forwards.

Beam splitter receives each up subsignal that each wireless device RE sends respectively, and described beam splitter divides Tong Guo individually not be connected with each wireless device by optical fiber, each up subsignal carry one up Mark and a physical layer bursts expense, described upper line identifier is for representing which a up subsignal is Wireless device sends, and described physical layer bursts expense is for realizing the clock of each wireless device with described The synchronization of the clock of radio equipment controller；

Each up subsignal described is transferred to radio equipment controller REC, described nothing by described beam splitter It is connected by optical fiber between line device controller with described beam splitter.

On the other hand, the signal transmission apparatus that the embodiment of the present invention provides, including:

Radio equipment controller REC, multiple wireless device RE, wherein,

Being connected by optical fiber between described radio equipment controller and beam splitter, described beam splitter passes through respectively Optical fiber is individually connected with each wireless device；

Described radio equipment controller, including: downlink broadcast unit, uplink receiving unit, each is wireless Equipment includes respectively: downlink reception unit, up transmitting element, wherein,

Described downlink broadcast unit, for broadcast downstream signal to described beam splitter, so that described beam splitter To downstream signal described in multiple broadcast by wireless devices, described downstream signal includes multiple descending subsignal, Each descending subsignal carries a lower line identifier, and described lower line identifier is descending for expression one Which wireless device subsignal is belonging to, and the clock of the plurality of wireless device wireless sets with described respectively The clock of preparation controller keeps synchronizing；

Each downlink reception unit, is respectively used to by between each wireless device described and described beam splitter The optical fiber connected, receives one's own descending sub-letter according to described lower line identifier from described downstream signal Number；

Each up transmitting element, is respectively used to by between each wireless device described and described beam splitter Connect optical fiber each up subsignal is sent to described beam splitter so that described beam splitter by described respectively Individual up subsignal is transferred to described radio equipment controller, and each up subsignal carries one Upper line identifier and a physical layer bursts expense, described upper line identifier is for representing that a up subsignal is Which wireless device sends, described physical layer bursts expense for realize the clock of each wireless device with The synchronization of the clock of described radio equipment controller；

Uplink receiving unit, for by being connected between described beam splitter with described radio equipment controller Optical fiber receives each up subsignal that described beam splitter forwards.

On the other hand, the beam splitter that the embodiment of the present invention provides, including:

First receives unit, for receiving the downstream signal of radio equipment controller REC broadcast, described nothing Be connected by optical fiber between line device controller with described beam splitter, described downstream signal include multiple under Row subsignal, each descending subsignal carries a lower line identifier, and described lower line identifier is used for table Show a descending subsignal is belonging to which wireless device RE's；

First transmission unit, is used for downstream signal described in multiple broadcast by wireless devices, so that the plurality of Wireless device receives one's own descending sub-letter according to described lower line identifier from described downstream signal respectively Number, described beam splitter is individually connected with each wireless device by optical fiber respectively, the plurality of wireless device Clock respectively with the clock of described radio equipment controller keep Tong Bu；

Second receives unit, for receiving each up subsignal that each wireless device sends respectively, often One up subsignal all carries a upper line identifier and a physical layer bursts expense, described upper rower Knowing for representing that a up subsignal is which wireless device sends, described physical layer bursts expense is used Synchronization with the clock of described radio equipment controller in the clock realizing each wireless device；

Second transmission unit, for being transferred to radio equipment controller by each up subsignal described.

On the other hand, the signal transmission system that the embodiment of the present invention provides, including: foregoing signal Transmission equipment and foregoing beam splitter.

As can be seen from the above technical solutions, the embodiment of the present invention has the advantage that

In the embodiment that the present invention provides, radio equipment controller is connected with beam splitter by optical fiber, Beam splitter is individually connected with each wireless device by optical fiber respectively, and radio equipment controller broadcast downstream is believed Number to beam splitter, then beam splitter by the optical fiber by being connected between beam splitter with radio equipment controller to This downstream signal of multiple broadcast by wireless devices, thus achieve radio equipment controller to respectively by beam splitter Individual wireless device transmission of downlink signal.Owing to radio equipment controller is connected with beam splitter by optical fiber, point Bundle device is individually connected with multiple wireless devices, compared to the point-to-point company of prior art by optical fiber the most respectively Connect, annular connection can save a large amount of optical fiber, and construction costs is low；Connect compared to the chain of prior art, Owing to each wireless device is connected with beam splitter by optical fiber the most respectively, will not phase between each wireless device Interference mutually, when one of them wireless device breaks down or network upgrade needs to increase wireless device, Do not interfere with the normal communications traffic between other wireless device and radio equipment controller；The present invention is real The signal transmission form executing example employing meets the existing network deployment field of current radio equipment controller and wireless device Scape, has good compatibility.

Accompanying drawing explanation

For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in embodiment being described below The required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this Some embodiments of invention, to those skilled in the art, it is also possible to obtain according to these accompanying drawings Other accompanying drawing.

Fig. 1 is three kinds of network topology structure schematic diagrams in prior art between REC and RE；

One embodiment schematic diagram of the method for transmitting signals that Fig. 2 provides for the present invention；

A networking structure schematic diagram between REC and RE that Fig. 3 provides for the present invention；

The schematic diagram of another networking structure between REC and RE that Fig. 4 provides for the present invention；

The frame structure schematic diagram of the downstream signal that Fig. 5 provides for the present invention；

Another embodiment schematic diagram of the method for transmitting signals that Fig. 6 provides for the present invention；

The frame structure schematic diagram of the upward signal that Fig. 7 provides for the present invention；

The embodiment schematic diagram of the signal transmission apparatus that Fig. 8 provides for the present invention；

The embodiment schematic diagram of the beam splitter that Fig. 9 provides for the present invention；

The embodiment schematic diagram of the signal transmission system that Figure 10 provides for the present invention；

Between each unit equipment included by signal transmission system that Figure 11 provides for the present invention, interaction flow shows It is intended to.

Detailed description of the invention

For making the goal of the invention of the present invention, feature, the advantage can be the most obvious and understandable, below will In conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Ground describes, it is clear that the embodiments described below are only a part of embodiment of the present invention, and not all Embodiment.Based on the embodiment in the present invention, the every other enforcement that those skilled in the art is obtained Example, broadly falls into the scope of protection of the invention.

A kind of method for transmitting signals that the embodiment of the present invention provides, as in figure 2 it is shown, include:

201, radio equipment controller broadcast downstream signal is to beam splitter.

Wherein, being connected by optical fiber between radio equipment controller with beam splitter, beam splitter passes through light respectively Fibre is individually connected with each wireless device, and downstream signal includes multiple descending subsignal, and each is descending Subsignal all carries a lower line identifier, and lower line identifier is for representing which a descending subsignal is belonging to Individual wireless device, the clock of multiple wireless devices keeps Tong Bu with the clock of radio equipment controller respectively.

The networking structure of the signal transmission system that the embodiment of the present invention provides is point-to-multipoint (PtMP, Point To Multipoint) optical fiber connect, i.e. radio equipment controller is connected with beam splitter by optical fiber, beam splitting Device is connected with at least two wireless device by different optical fiber respectively.The embodiment of the present invention is provided For beam splitter, one is achieved in that beam splitter can be passive light power splitter, wherein, passive Luminous power beam splitter is a kind of passive optical fiber devices, and the reliability of beam splitter is equal to optical fiber link, for The optical signal of transmission only introduces certain power decay, at intelligent acess (FTTx, Fiber-To-The-x) Network has extensive application.The splitting ratio of beam splitter is 1: 64, is connected between beam splitter with wireless device Branch optical fiber can reach more than 20 kms (km), is connected between beam splitter with radio equipment controller Trunk optical fiber can reach more than 20km, and beam splitter can arbitrarily cascade, as long as ensureing that total luminous power is pre- Calculate and in the case of splitting ratio, can arbitrarily draw branch optical fiber according to physical site distribution actual for RE, Engineering construction is convenient.

As it is shown on figure 3, in a signal transmission system, radio equipment controller (hereinafter referred to as REC) Being connected with beam splitter by an optical fiber (such as optical fiber 0), beam splitter passes through three light (such as light Fibre 1, optical fiber 2, optical fiber 3) it is connected with each wireless device (such as RE1, RE2, RE3) respectively, In embodiments of the present invention, the signal between RE1, RE2, RE3 and REC is achieved by beam splitter Transmission.

If the point-to-point interconnection according to prior art, it is achieved RE1, RE2, RE3 respectively with REC Between connection, the optical fiber sum of needs is three optical fiber, 1, optical fiber of 0 a, optical fiber 2, Optical fiber 3, and the optical fiber sum needed in the embodiment of the present invention is 0, optical fiber of an optical fiber 1, 2, optical fiber 3 of optical fiber, it is seen that the networking mode that the embodiment of the present invention provides can save optical fiber, reduces Construction costs, under normal conditions, each RE at a distance of between distance not far, optical fiber 1 and light 2 and light The length of fine 3 is the shortest, and it is longer that the length of optical fiber is mainly optical fiber 0.

If such as the chain in Fig. 1 connects according to prior art, REC directly connects with RE1, RE1 and RE2 connects, and RE2 is connected with RE3 again, the RE that existing chain connected mode is identical relative to quantity Point-to-point connection can save number of fibers, reduce construction costs, but as middle RE1 or RE2 When breaking down, the communication service between all RE and REC in downstream can be caused to interrupt, affect whole industry The normal operation of business system, and when network upgrade needs to increase RE, need to take whole chain apart and connect Link, the normal communications traffic of the RE in meeting broken link.And the signal transmission that the embodiment of the present invention proposes Method, when RE1 or RE2 or RE3 breaks down, the proper communication between other RE and REC Business is unaffected, when network upgrade needs to increase wireless device, it is only necessary to the nothing that will newly increase Line equipment is directly cascaded on beam splitter, does not also interfere with between original wireless device and REC Normal communications traffic.

If according to the annular connection of prior art, owing to REC Yu RE1, RE2, RE3 pass through optical fiber After completing to connect, RE3 is needed to be connected with REC to form ring network again.The group that the embodiment of the present invention proposes Net mode, it is only necessary to REC is coupled together by an optical fiber with beam splitter, the most respectively by RE1, RE2, RE3 is connected on beam splitter, and the networking mode that the present invention provides can save optical fiber, reduces construction costs.

It should be noted that in embodiments of the present invention, beam splitter can arbitrarily cascade, as long as ensureing total Optical power budget and splitting ratio in the case of, arbitrarily can draw according to physical site distribution actual for RE Branch optical fiber, engineering construction is convenient, and as shown in Figure 4, REC passes through optical fiber 0 and beam splitter 1 phase Connecting, beam splitter 1 is connected with beam splitter 2 by optical fiber 4, beam splitter 1 pass through optical fiber 1, optical fiber 2, Optical fiber 3 is connected with RE1, RE2, RE3 respectively, beam splitter 2 by optical fiber 5, optical fiber 6 respectively with RE4, RE5 are connected.Certainly, Fig. 4 is a kind of legend illustrating that beam splitter can cascade, in reality Application can also be disposed according to concrete application scenarios the situation of multiple beam splitters cascade, simply say herein Bright, do not limit.

In embodiments of the present invention, a kind of feasible being achieved in that, radio equipment controller is multiple with the time-division With (TDM, Time Division Multiplex) broadcast downstream signal, radio equipment controller is descending Including multiple descending subsignal in signal, each descending subsignal carries a lower line identifier, Lower line identifier is for representing which wireless device a descending subsignal is belonging to.Each wireless device root One's own descending subsignal is only received according to the lower line identifier of each descending subsignal in downstream signal.Example As, if as it is shown on figure 3, the descending subsignal in the downstream signal of REC broadcast carries the mark of RE1, Then represent that this descending subsignal is destined to RE1, if RE2 is according to the descending sub-letter in this downstream signal The mark of number RE1 carried can judge to learn that this descending subsignal is not destined to oneself, and will will Downstream signal abandons.

In actual applications, use as a example by CPRI standard by REC and illustrate, REC by optical fiber with Beam splitter is connected, and it is common that beam splitter is connected to RE1, RE2 ..., RE63 by different optical fiber respectively The frame structure of the downstream signal of 63 RE, REC broadcast refers to shown in Fig. 5, and Fig. 5 is that the present invention is real Execute the frame structure schematic diagram of the downstream signal that example provides, wherein, basic frame number (BFN, Basic Frame Number) being the frame of CPRI standard, frame length is that the BFN of 10ms, 10ms includes respectively altogether RE1 ..., REn ..., the Hyperframe (Hyperframe) of RE63 distribution and PtMP control frame. Hyperframe is respectively #0 ..., #Z ..., #M, and the structure of each Hyperframe increases several byte Expense (overhead), expense includes the Identity Code (ID, IDentity) of each RE the most respectively As mark, the payload (payload) of each Hyperframe also includes 256 base frames (basic frame) It is respectively #0 ..., #x ..., #255.Also include in the structure of PtMP control frame that the ID of each RE makees For mark, PtMP control frame refers to the Physical layer control information that PtMP needs, can according to a REC Calculating less than 128 with the RE quantity connected, 7bit RE ID can identify all RE quantity, increases The expense of 1 byte i.e. can identify different RE, and wherein highest order is that the RE ID of " 1 " represents broadcast message, Showing to carry the control information of PtMP, all of RE will receive.According to existing CPRI standard, The Hyperframe quantity supported in 10ms is 150, owing to adding before each RE in the embodiment of the present invention RE ID expense and PtMP control frame, therefore M the Hyperframe supported altogether is less than 149.Certainly, with The evolution of standard and the development of technology, the quantity of the Hyperframe of support can have other to change, at this Illustrate as example, do not limit.

In actual applications, PtMP CPRI interface needs to carry out HardwareUpgring on existing CPRI interface, In order to avoid resource is wasted in repeated construction, can be on the hardware device of original REC and RE, by PtMP CPRI interface function is integrated in pluggable CPRI optical module, and REC, RE provide compatible original Hardware interface, so can protect existing REC, RE hardware investment, it is only necessary to change CPRI optical mode Block i.e. can upgrade to PtMP networking.

It should be noted that in the prior art, no matter point-to-point connection or chain connects or annular even Connecing, it is not carry mark that REC is sent to the downstream signal of RE, and the embodiment of the present invention passes through the time-division The mode of multiplexing represents the descending subsignal being sent to each wireless device, beam splitting with the mark of wireless device Device is able to receive that radio equipment controller by the optical fiber being connected between beam splitter with radio equipment controller The downstream signal of broadcast.

It should be noted that the wireless device in the embodiment of the present invention can be specifically Remote Radio Unit (RRU, Remote Radio Unit), RRU is typically mounted on outdoor, less need for device upgrade.This Radio equipment controller in inventive embodiments can be specifically baseband processing unit (BBU, Base Band Unit), the structure of BBU is complicated, needs frequently to carry out software upgrading and real-time servicing, by RE far End is affixed one's name to, and REC can be concentrated in together and be managed, it is possible to effectively reduce wireless O&M difficulty, Simplify the requirement of wireless site, meet operator and concentrate the networking requirement disposed.

It addition, in embodiments of the present invention, the clock of each wireless device respectively with radio equipment controller Clock keep synchronizing, and be connected with beam splitter by different optical fiber respectively due to each wireless device, Therefore each wireless device is separate, its respective clock can be separate.

202, each wireless device passes through beam splitter and the optical fiber being connected between oneself respectively, according to lower rower Know from downstream signal, receive one's own descending subsignal.

In embodiments of the present invention, beam splitter, after radio equipment controller receives downstream signal, divides Bundle device by with the optical fiber being connected between each wireless device downstream signal being transferred to each wireless device, With realize radio equipment controller broadcast downstream signal can be transferred to each wireless device, due under The multiple descending subsignal that row signal includes carries lower line identifier, and each wireless device can be according under this Line identifier only receives one's own descending subsignal.

If as it is shown on figure 3, the descending subsignal that the downstream signal of REC broadcast includes carries lower line identifier RE1, then it represents that this descending subsignal is destined to RE1, when beam splitter, to receive this from REC descending After signal, by optical fiber 1, optical fiber 2, optical fiber 3, downstream signal is transferred to RE1, RE2, RE3 respectively, By lower line identifier RE1, RE1 finds that this lower line identifier represents and is belonging to oneself descending subsignal, then RE1 Receiving this descending subsignal, RE2 and RE3 can judge to learn this descending sub-letter according to this lower line identifier RE1 Number it is not destined to oneself, this downstream signal will be abandoned.

It should be noted that in order to ensure radio open performance requirement, need between REC and RE to ensure Time delay symmetry, such as, global system for mobile communications (GSM, Global System of Mobile Communication) propagation delay time requiring signal between REC and RE requires less than 1ms.Step 202 In, beam splitter is by beam splitter respectively with the optical fiber being connected between each wireless device by downstream signal respectively After being transferred to each wireless device, it is also possible to comprise the steps: that each wireless device is according to receiving One's own descending subsignal calculate propagation delay time respectively, propagation delay time is for when each wireless device Up subsignal is revised, to ensure that each wireless sets when sending up subsignal to radio equipment controller Standby identical with the transmitted in both directions time delay between radio equipment controller.Wireless device receives from beam splitter After row signal, owing to wireless device keeps Tong Bu with the clock of radio equipment controller, then wireless device The transmission time point of record from downstream signal can be deducted with the time point receiving downstream signal, obtain Radio equipment controller sends propagation delay time produced by downstream signal.

It should be noted that the method for transmitting signals that the embodiment of the present invention provides can also include: wireless set Preparation controller opens ranging window, with realize the wireless device being subordinated to radio equipment controller opened station or Find range when breaking down.In order to allow the RE of different distance can be automatically obtained access when opening station REC, radio equipment controller needs to open ranging window, and during range finding, the transmission of upward signal needs to stop, For the network radius of 2km, need the time of 2 frames if having found range, then the transmission of upward signal is about Needing to stop 200 microseconds (us), upward signal stops the time of transmission by specifically the most in actual applications Networking structure determine, the most only explain, do not limit.In wireless traffic is applied, due to only RE opens station or RE just needs again to find range when breaking down, and arranging range finding mechanism needs RE to send Fault or by webmaster trigger just open ranging window, with reduce find range for normal RE service impact. When the RE of fault is found range again, owing to storage has original ranging information, therefore range-finder window can be shortened Mouthful, do not affect other RE and run.

In the embodiment that the present invention provides, radio equipment controller is connected with beam splitter by optical fiber, point Bundle device is individually connected with each wireless device by optical fiber respectively, radio equipment controller broadcast downstream signal To beam splitter, then beam splitter by the optical fiber by being connected between beam splitter with radio equipment controller to many This downstream signal of individual broadcast by wireless devices, thus achieve radio equipment controller to each by beam splitter Wireless device transmission of downlink signal.Due to radio equipment controller by optical fiber be connected with beam splitter, beam splitting Device is individually connected with multiple wireless devices by optical fiber the most respectively, compared to prior art point-to-point connection, Annular connects can save a large amount of optical fiber, and construction costs is low；Connect compared to the chain of prior art, by It is connected with beam splitter by optical fiber the most respectively in each wireless device, will not be mutual between each wireless device Interference, when one of them wireless device breaks down or network upgrade needs to increase wireless device, no Influence whether the normal communications traffic between other wireless device and radio equipment controller；The present invention implements The signal transmission form that example uses meets the existing network deployment field of current radio equipment controller and wireless device Scape, has good compatibility.

Above example describes the method for transmitting signals that the embodiment of the present invention provides, and next introduces corresponding In the method for transmitting signals of previous embodiment, different from the embodiment shown in Fig. 2, what Fig. 2 described is The method for transmitting signals realized based on radio equipment controller and wireless device, next describe be based on A kind of method for transmitting signals that beam splitter realizes, including:

Beam splitter receives the downstream signal of radio equipment controller broadcast, radio equipment controller and beam splitter Between connected by optical fiber, downstream signal includes multiple descending subsignal, each descending subsignal Carrying a lower line identifier, lower line identifier is for representing which descending subsignal is belonging to and wireless sets Standby；

Beam splitter is to multiple broadcast by wireless devices downstream signals, so that multiple wireless device is according to lower line identifier From downstream signal, receive one's own descending subsignal respectively, beam splitter respectively by optical fiber and each Wireless device individually connects, and the clock of multiple wireless devices keeps with the clock of radio equipment controller respectively Synchronize.

In embodiments of the present invention, beam splitter receives downstream signal from radio equipment controller, then transmits To each wireless device, thus achieve radio equipment controller by beam splitter and pass to each wireless device Defeated downstream signal.Owing to radio equipment controller is connected with beam splitter by optical fiber, beam splitter leads to the most respectively Cross optical fiber to be individually connected with multiple wireless devices, connect compared to point-to-point connection, the annular of prior art Can save a large amount of optical fiber, construction costs is low；Connect, due to each nothing compared to the chain of prior art Line equipment is connected with beam splitter by optical fiber the most respectively, will not interfere between each wireless device, when When one of them wireless device breaks down or network upgrade needs to increase wireless device, do not interfere with Normal communications traffic between other wireless device and radio equipment controller；The embodiment of the present invention uses Signal transmission form meets the existing network deployment scenario of current radio equipment controller and wireless device, has very Good compatibility.

Next the another kind of method for transmitting signals that the embodiment of the present invention provides, as shown in Figure 6, bag are introduced Include:

601, each wireless device respectively by beam splitter and the optical fiber that is connected between oneself by each up son Signal is sent to beam splitter.

Wherein, being connected by optical fiber between radio equipment controller with beam splitter, beam splitter passes through light respectively Fibre is individually connected with each wireless device, and each up subsignal carries a upper line identifier and Individual physical layer bursts expense, upper line identifier is for representing that a up subsignal is which wireless device sends , physical layer bursts expense is for realizing the clock of each wireless device and the clock of radio equipment controller Synchronization；

The embodiment of the present invention provide signal transmission system the optical fiber that networking structure is PtMP connect, i.e. without Line device controller is connected with beam splitter by optical fiber, and beam splitter is respectively by different optical fiber and at least two Individual wireless device connects, and for the beam splitter that the embodiment of the present invention provides, one is achieved in that point Bundle device can be passive light power splitter, and wherein, passive light power splitter is a kind of passive fiber device Part, inexpensive, reliability equivalent optical fiber link, the optical signal for transmitting only introduces certain power and declines Subtract, the network of FTTx has extensive application.The networking of the signal transmission system that the embodiment of the present invention describes Structure specifically may refer to the description of previous embodiment and Fig. 3 and Fig. 4, and here is omitted.

In embodiments of the present invention, a kind of feasible being achieved in that, each wireless device is with time division multiple acess (TDMA, Time Division Multiple Access) mode sends up letter to radio equipment controller Number, each wireless device first passes through the optical fiber between oneself and radio equipment controller by up subsignal Being sent to beam splitter, each up subsignal carries a upper line identifier and a physical layer bursts Expense, physical layer bursts expense is for realizing the clock of each wireless device described and described wireless device control The synchronization of the clock of device processed, in the same way, each wireless device sets to wireless in TDMA mode Preparation controller sends up subsignal, but the propagation delay time inserted in each up subsignal is different, To ensure that each wireless device and radio equipment controller ensure that strict time delay symmetry.

In actual applications, use as a example by CPRI standard by REC and illustrate, REC by optical fiber with Beam splitter is connected, and it is common that beam splitter is connected to RE1, RE2 ..., RE63 by different optical fiber respectively 63 RE, the frame structure of the upward signal that each RE is sent to beam splitter refers to shown in Fig. 7, Fig. 7 For the frame structure schematic diagram of the upward signal that the embodiment of the present invention provides, BFN is the frame of CPRI standard, Frame length is that the BFN of 10ms, 10ms includes respectively RE1 ..., REn ..., RE63 distribution altogether Hyperframe (Hyperframe) and PtMP control frame.Hyperframe be respectively #0 ..., #Z ..., #M, the structure of each Hyperframe increases the expense (overhead) of several byte, divides in expense Not including Identity Code (ID, IDentity) and the physical layer bursts expense of each RE, each surpasses The payload (payload) of high frame also include 256 base frames (basic frame) be respectively #0 ..., #x ..., #255.Also ID and physical layer bursts expense, the PtMP of each RE is included in the structure of PtMP control frame Control frame refers to the Physical layer control information that PtMP needs, and physical layer bursts expense is generally less than 8 Byte, the physical layer bursts burst overhead time realizes signal for the REC receiving side and synchronizes.According to existing CPRI standard, the Hyperframe quantity supported in 10ms is 150, due to each in the embodiment of the present invention Add RE ID expense and PtMP control frame before RE, therefore M the Hyperframe supported altogether is less than 149.Certainly, along with evolution and the development of technology of standard, the quantity of the Hyperframe of support can have other Change, is only used as example and illustrates, do not limit at this.

It should be noted that in embodiments of the present invention, the clock of each wireless device sets with wireless respectively The clock of preparation controller keeps synchronizing, and due to each wireless device respectively by different optical fiber and beam splitting Device is connected, and each wireless device is separate, and its respective clock is separate.

It should be noted that in the prior art, no matter point-to-point connection or chain connects or annular even Connecing, it is not carry line identifier that RE is sent to the up subsignal of REC, and the embodiment of the present invention is led to The mode crossing time division multiple acess represents the up letter being sent to radio equipment controller with the mark of wireless device Number, by the optical fiber being connected between beam splitter with each wireless device, beam splitter is able to receive that each is wireless The up subsignal that equipment sends.

602, radio equipment controller is received by the optical fiber being connected between beam splitter with radio equipment controller Each up subsignal that beam splitter forwards.

In embodiments of the present invention, beam splitter from each radio equipment controller receive up subsignal it After, the optical fiber that beam splitter passes through to be connected between beam splitter with radio equipment controller is by each up subsignal Being sent to radio equipment controller, the up subsignal sent to realize each wireless device can be transmitted To radio equipment controller, which up son radio equipment controller identifies according to line identifier on each Signal is which wireless device sends, and radio equipment controller can distinguish each nothing according to up mark The up subsignal that line equipment sends.

It should be noted that in embodiments of the present invention, it is wireless that physical layer bursts expense is used for realizing each The clock of equipment and the clock of radio equipment controller be synchronization accomplished in that wireless device control Each up subsignal that beam splitter is sent by device processed by local clock is sampled, in physical layer bursts The clock of each wireless device is completed synchronization with the clock of radio equipment controller in expense.

In the embodiment that the present invention provides, radio equipment controller is connected with beam splitter by optical fiber, point Bundle device is individually connected with each wireless device by optical fiber respectively, and each wireless device passes through beam splitter respectively Each up subsignal is sent to beam splitter by the optical fiber being connected with between oneself, and radio equipment controller leads to Cross the optical fiber being connected between beam splitter with radio equipment controller and receive each up sub-letter that beam splitter forwards Number, say, that beam splitter by the optical fiber by being connected between beam splitter with radio equipment controller by each Up subsignal is sent to radio equipment controller, thus by beam splitter achieve each wireless device to Radio equipment controller transmits up subsignal.Due to radio equipment controller with beam splitter by optical fiber even Connecing, beam splitter is connected by optical fiber with multiple wireless devices the most respectively, point-to-point compared to prior art Connect, annular connection can save a large amount of optical fiber, and construction costs is low；Connect compared to the chain of prior art Connect, owing to each wireless device is connected with beam splitter, by optical fiber the most respectively between each wireless device not Can interfere, when one of them wireless device break down or network upgrade need increase wireless device Time, do not interfere with the normal communications traffic between other wireless device and radio equipment controller；This The signal transmission form that bright embodiment uses meets the existing network portion of current radio equipment controller and wireless device Administration's scene, has good compatibility.

Above example describes the method for transmitting signals that the embodiment of the present invention provides, and next introduces corresponding In the method for transmitting signals of previous embodiment, different from the embodiment shown in Fig. 6, what Fig. 6 described is The method for transmitting signals realized based on radio equipment controller and wireless device, next describe be based on A kind of method for transmitting signals that beam splitter realizes, including:

Beam splitter receives each up subsignal that each wireless device sends respectively, and beam splitter passes through respectively Optical fiber is individually connected with each wireless device, each up subsignal carry a upper line identifier and One physical layer bursts expense, upper line identifier is for representing that a up subsignal is which wireless device is sent out Send, physical layer bursts expense for realize the clock of each wireless device and radio equipment controller time The synchronization of clock；

Each up subsignal is transferred to radio equipment controller by beam splitter, radio equipment controller with point Connected by optical fiber between bundle device.

In the embodiment that the present invention provides, radio equipment controller is connected with beam splitter by optical fiber, point Bundle device is individually connected with each wireless device by optical fiber respectively, beam splitter by with each wireless device it Between connect optical fiber receive each up subsignal, the most again each up subsignal is sent to wireless Device controller, achieves each wireless device by beam splitter and transmits up son to radio equipment controller Signal, owing to radio equipment controller is connected by optical fiber with beam splitter, beam splitter the most respectively with multiple nothings Line equipment is connected by optical fiber, can save big compared to the point-to-point connection of prior art, annular connection Amount optical fiber, construction costs is low；Connect, owing to each wireless device all divides compared to the chain of prior art Tong Guo not be connected with beam splitter by optical fiber, will not interfere between each wireless device, when one of them When wireless device breaks down or network upgrade needs to increase wireless device, do not interfere with other and wireless set Normal communications traffic between standby and radio equipment controller；The signal transmission side that the embodiment of the present invention uses Formula meets the existing network deployment scenario of current radio equipment controller and wireless device, has good compatibility.

Above example describes the method for transmitting signals that the embodiment of the present invention provides, and next introduces application The signal transmission apparatus of this method for transmitting signals, refers to shown in Fig. 8, the letter that the embodiment of the present invention provides Number transmission equipment 800, including: radio equipment controller 801, multiple wireless device 802 (show in Fig. 8 First wireless device the 8021, second wireless device 8022 ..., N wireless device 802N are gone out, altogether Counting N number of wireless device, N is natural number), wherein,

Being connected by optical fiber between radio equipment controller 801 with beam splitter 802, beam splitter passes through respectively Optical fiber is individually connected with each wireless device；

Radio equipment controller 801 includes: downlink broadcast unit 8011, uplink receiving unit 8012, respectively Individual wireless device includes respectively: downlink reception unit, up transmitting element (such as, the first wireless device 8021 include first downlink reception unit the 80211, first up transmitting element 80212, the second wireless device 8022 include second downlink reception unit the 80221, second up transmitting element 80222 ..., N without Line equipment 802N includes N downlink reception unit 802N1, N up transmitting element 802N2, for Describe below convenience, by first downlink reception unit the 80211, second downlink reception unit 80221 ..., N downlink reception unit 802N1 and referred to as each downlink reception unit, by the first up transmitting element 80212, the second up transmitting element 80222 ..., N up transmitting element 802N2 and referred to as each Individual up transmitting element), wherein,

Downlink broadcast unit 8011, for broadcast downstream signal to beam splitter, so that beam splitter is to multiple nothings Line device broadcasts downstream signal, downstream signal includes multiple descending subsignal, each descending subsignal All carrying a lower line identifier, lower line identifier is wireless for representing which a descending subsignal is belonging to Equipment, the clock of multiple wireless devices keeps Tong Bu with the clock of radio equipment controller respectively；

Each downlink reception unit, is respectively used to the light by being connected between each wireless device with beam splitter Fibre, receives one's own descending subsignal according to lower line identifier from downstream signal；

Each up transmitting element, is respectively used to the light by being connected between each wireless device with beam splitter Each up subsignal is sent to beam splitter, so that each up subsignal is transferred to nothing by beam splitter by fibre Line device controller, each up subsignal carries a upper line identifier and a physical layer bursts Expense, upper line identifier is for representing that a up subsignal is which wireless device sends, and physical layer is dashed forward Send out expense synchronization with the clock of radio equipment controller for the clock realizing each wireless device；

Uplink receiving unit 8012, for by the optical fiber being connected between beam splitter with radio equipment controller Receive each up subsignal that beam splitter forwards.

It should be noted that in the embodiment of the present invention provide multiple wireless devices refer at least two without Line equipment, each wireless device 802 respectively further comprises (not shown in FIG. 8): time-delay calculation unit, Wherein, each time-delay calculation unit is respectively used to according to the one's own descending subsignal received respectively Calculating propagation delay time, propagation delay time is for sending up when each wireless device to radio equipment controller Up subsignal is revised, to ensure double with between radio equipment controller of each wireless device during subsignal Identical to propagation delay time.

It should be noted that the most individual, a kind of feasible being achieved in that, wireless set Preparation controller 801 can also include (not shown in FIG. 8): range cells, and wherein, range cells is used In time opening station when the wireless device being subordinated to radio equipment controller or break down, open ranging window.

It should be noted that contents such as mutual, the execution processes of information between said apparatus, due to this Inventive method embodiment is based on same design, and its technique effect brought is identical with the inventive method embodiment, Particular content can be found in the narration in present invention embodiment of the method as shown in Figure 2 and Figure 6.

In the embodiment that the present invention provides, radio equipment controller is connected with beam splitter by optical fiber, point Bundle device is individually connected with each wireless device by optical fiber respectively, radio equipment controller broadcast downstream signal To beam splitter, then beam splitter by the optical fiber by being connected between beam splitter with radio equipment controller to many This downstream signal of individual broadcast by wireless devices, thus achieve radio equipment controller to each by beam splitter Wireless device transmission of downlink signal.Each wireless device passes through beam splitter and the light being connected between oneself respectively Each up subsignal is sent to beam splitter by fibre, and radio equipment controller passes through beam splitter and wireless device The optical fiber connected between controller receives each up subsignal that beam splitter forwards, say, that beam splitter By the optical fiber being connected between beam splitter with radio equipment controller, each up subsignal is sent to wireless Device controller, achieves each wireless device by beam splitter and transmits up son to radio equipment controller Signal.Owing to radio equipment controller is connected with beam splitter by optical fiber, beam splitter passes through optical fiber the most respectively Individually it is connected with multiple wireless devices, connects can save compared to point-to-point connection, the annular of prior art Saving a large amount of optical fiber, construction costs is low；Connect, due to each wireless device compared to the chain of prior art It is connected with beam splitter by optical fiber the most respectively, will not interfere between each wireless device, when therein When one wireless device breaks down or network upgrade needs to increase wireless device, do not interfere with other nothing Normal communications traffic between line equipment and radio equipment controller；The signal that the embodiment of the present invention uses passes Defeated mode meets the existing network deployment scenario of current radio equipment controller and wireless device, has and well holds concurrently Capacitive.

Next a kind of beam splitter that the embodiment of the present invention provides is introduced, as it is shown in figure 9, beam splitter 900, Including:

First receives unit 901, for receiving the downstream signal of radio equipment controller broadcast, wireless device Being connected by optical fiber between controller with beam splitter, downstream signal includes multiple descending subsignal, each Individual descending subsignal all carries a lower line identifier, and lower line identifier is for representing that a descending subsignal is Belong to which wireless device RE's；

First transmission unit 902, for multiple broadcast by wireless devices downstream signals, wireless sets so that multiple Receiving one's own descending subsignal from downstream signal respectively for according to lower line identifier, beam splitter is respectively Individually be connected with each wireless device by optical fiber, the clock of multiple wireless devices respectively with wireless device control The clock of device processed keeps synchronizing；

Second receives unit 903, for receiving each up subsignal that each wireless device sends respectively, Each up subsignal carries a upper line identifier and a physical layer bursts expense, upper line identifier For representing that a up subsignal is which wireless device sends, physical layer bursts expense is used for realizing The clock of each wireless device is synchronization with the clock of radio equipment controller；

Second transmission unit 904, for being transferred to radio equipment controller by each up subsignal.

In embodiments of the present invention, beam splitter receives downstream signal from radio equipment controller, then transmits To each wireless device, beam splitter is by receiving on each with the optical fiber being connected between each wireless device Row subsignal, is sent to radio equipment controller by each up subsignal the most again.Thus pass through beam splitting Device achieves radio equipment controller to each wireless device transmission of downlink signal.Due to wireless device controls Device is connected with beam splitter by optical fiber, and beam splitter is individually connected with multiple wireless devices by optical fiber the most respectively, Can save a large amount of optical fiber compared to the point-to-point connection of prior art, annular connection, construction costs is low； Connect compared to the chain of prior art, due to each wireless device the most respectively by optical fiber with beam splitter the most even Connect, will not interfere between each wireless device, when one of them wireless device breaks down or net When network upgrading needs to increase wireless device, do not interfere with other wireless device and radio equipment controller it Between normal communications traffic；The signal transmission form that the embodiment of the present invention uses meets current wireless device control Device processed and the existing network deployment scenario of wireless device, have good compatibility.

It follows that introduce a kind of signal transmission system that the embodiment of the present invention provides, as shown in Figure 10, letter Number system 1000, including: signal transmission apparatus 1001 as shown in Figure 8 and beam splitter as shown in Figure 9 1002,

It should be noted that the contents such as mutual, the execution process of information between the internal each equipment of said system, Due to the inventive method embodiment based on same design, its technique effect brought and the inventive method are real Executing example identical, particular content can be found in the narration in the embodiment of the method for the present invention, and here is omitted.

It should be noted that in actual applications, signal transmission system can include multiple wireless device, Multiple wireless devices are connected with beam splitter by optical fiber, and in actual applications in signal transmission system Multiple beam splitter can also be included, the most as shown in Figure 4, include two beam splitters with signal transmission system As a example by illustrate, be certainly not limited to two beam splitters, simply explanation, does not limits, example herein As, in signal transmission system in addition to including beam splitter 1002, it is also possible to include another beam splitter (not Figure 10 illustrates), wherein,

Radio equipment controller is connected with beam splitter 1002 by optical fiber, beam splitter 1002 and another beam splitting Being connected by optical fiber between device, beam splitter 1002 is respectively by optical fiber and the part nothing in multiple wireless devices Line equipment individually connects, and another beam splitter is wireless with remaining in multiple wireless devices by optical fiber respectively Equipment individually connects.Specific to as shown in Figure 4, beam splitter 1002 can be beam splitter 1, another beam splitting Device can be beam splitter 2, then beam splitter 1 is connected by optical fiber with RE1, RE2, RE3, beam splitter 2 It is connected by optical fiber with RE4, RE5.

Next the workflow of the signal transmission system that the embodiment of the present invention provides is described in detail: Radio equipment controller, beam splitter and two wireless devices (specially first are included with signal transmission system Wireless device and the second wireless device) as a example by illustrate, as shown in figure 11, first describe is descending The transmitting procedure of signal, such as step 1101 and the explanation of 1102, then describe is up subsignal Transmitting procedure, such as the explanation of step 1103 to 1105.

1101, radio equipment controller broadcast downstream signal is to beam splitter.

1102, beam splitter is to the first wireless device and the second broadcast by wireless devices downstream signal.

1103, the first wireless device by beam splitter and the optical fiber that is connected between oneself by the first up sub-letter Number it is sent to beam splitter.

1104, the second wireless device by beam splitter and the optical fiber that is connected between oneself by the second up sub-letter Number it is sent to beam splitter.

1105, the first up subsignal and the second up subsignal are transferred to wireless device controls by beam splitter Device.

In the embodiment that the present invention provides, radio equipment controller is connected with beam splitter by optical fiber, point Bundle device is individually connected with each wireless device by optical fiber respectively, radio equipment controller broadcast downstream signal To beam splitter, then beam splitter by the optical fiber by being connected between beam splitter with radio equipment controller to many This downstream signal of individual broadcast by wireless devices, achieves radio equipment controller by beam splitter wireless to each Device transmission downstream signal.Each wireless device passes through beam splitter respectively and the optical fiber being connected between oneself will Each up subsignal is sent to beam splitter, and radio equipment controller passes through beam splitter and wireless device controls The optical fiber connected between device receives each up subsignal that beam splitter forwards, say, that beam splitter passes through Each up subsignal is sent to wireless device by the optical fiber being connected between beam splitter with radio equipment controller Controller, achieves each wireless device by beam splitter and transmits up subsignal to radio equipment controller. Be connected with beam splitter owing to radio equipment controller passes through optical fiber, beam splitter passes through optical fiber the most respectively with multiple Wireless device individually connects, and can save a large amount of compared to the point-to-point connection of prior art, annular connection Optical fiber, construction costs is low, connects, owing to each wireless device is all distinguished compared to the chain of prior art It is connected with beam splitter by optical fiber, will not interfere between each wireless device, when one of them nothing When line equipment breaks down or network upgrade needs to increase wireless device, do not interfere with other wireless device And the normal communications traffic between radio equipment controller；The signal transmission form that the embodiment of the present invention uses Meet the existing network deployment scenario of current radio equipment controller and wireless device, there is good compatibility.

One of ordinary skill in the art will appreciate that all or part of step realizing in above-described embodiment method The program that can be by completes to instruct relevant hardware, and described program can be stored in a kind of computer In readable storage medium storing program for executing, storage medium mentioned above can be read only memory, disk or CD etc..

Above a kind of method for transmitting signals provided by the present invention and relevant device and signal transmission system are entered Go and be discussed in detail, for one of ordinary skill in the art, according to the thought of the embodiment of the present invention, All will change in detailed description of the invention and range of application, in sum, this specification content should not It is interpreted as limitation of the present invention.

Claims

1. a method for transmitting signals, it is characterised in that including:

Use the radio equipment controller REC broadcast downstream signal of common public radio interface CPRI standard To beam splitter, so that described beam splitter broadcasts described downstream signal to multiple wireless device RE, described wireless Being connected by optical fiber between device controller with described beam splitter, described beam splitter passes through optical fiber respectively with each Individual wireless device individually connects, and described downstream signal includes multiple descending subsignal, each descending son Signal all carries a lower line identifier, and described lower line identifier is for representing that a descending subsignal is belonging to Which wireless device, the clock of the plurality of wireless device respectively with described radio equipment controller time Clock keeps synchronizing；

Each wireless device described passes through described beam splitter and the optical fiber being connected between oneself respectively, according to institute State lower line identifier from described downstream signal, only receive one's own descending subsignal.

Method for transmitting signals the most according to claim 1, it is characterised in that described each wireless sets Back-up not Tong Guo described beam splitter and the optical fiber that is connected between oneself, according to described lower line identifier from described After row signal the most only receives one's own descending subsignal, also include:

When each wireless device described calculates transmission respectively according to the one's own descending subsignal received Prolonging, described propagation delay time is for sending to described radio equipment controller when each wireless device described Described up subsignal is revised, to ensure that each wireless device described is with described wireless device during row subsignal Transmitted in both directions time delay between controller is identical.

Method for transmitting signals the most according to claim 1 and 2, it is characterised in that described signal passes Transmission method also includes:

When the wireless device being subordinated to described radio equipment controller is opened station or breaks down, described wireless Ranging window opened by device controller.

4. a method for transmitting signals, it is characterised in that including:

Beam splitter receives and uses the radio equipment controller REC of common public radio interface CPRI standard wide The downstream signal broadcast, is connected by optical fiber between described radio equipment controller with described beam splitter, described Downstream signal includes multiple descending subsignal, and each descending subsignal carries a lower line identifier, Described lower line identifier is for representing a descending subsignal is belonging to which wireless device RE's；

Described beam splitter is to downstream signal described in multiple broadcast by wireless devices, so that the plurality of wireless device From described downstream signal, one's own descending subsignal, institute is the most only received according to described lower line identifier State beam splitter to be individually connected with each wireless device by optical fiber respectively, the clock of the plurality of wireless device Keep Tong Bu with the clock of described radio equipment controller respectively.

5. a method for transmitting signals, it is characterised in that including:

Each wireless device RE respectively by beam splitter and the optical fiber that is connected between oneself by each up son Signal is sent to described beam splitter, so that each up subsignal described is transferred to use by described beam splitter The radio equipment controller REC of common public radio interface CPRI standard, described radio equipment controller Being connected by optical fiber with between described beam splitter, described beam splitter is respectively by optical fiber and each wireless device Individually connecting, each up subsignal carries a upper line identifier and a physical layer bursts expense, Described upper line identifier is which wireless device sends for one up subsignal of expression, described physical layer Burst overhead is used for the clock realizing each wireless device described clock with described radio equipment controller Synchronize；

Method for transmitting signals the most according to claim 5, it is characterised in that described signal transmission side Method also includes:

7. according to the method for transmitting signals described in claim 5 or 6, it is characterised in that described physical layer Burst overhead is used for the clock realizing each wireless device described clock with described radio equipment controller Synchronization is accomplished in that

Each up subsignal that described beam splitter is sent by described radio equipment controller by local clock Sample, in described physical layer bursts expense, complete the clock of each wireless device described and described nothing The synchronization of the clock of line device controller.

8. a method for transmitting signals, it is characterised in that including:

Each up subsignal described is transferred to use common public radio interface CPRI by described beam splitter The radio equipment controller REC of standard, passes through light between described radio equipment controller and described beam splitter Fine connection.

9. a signal transmission apparatus, it is characterised in that including: use common public radio interface CPRI The radio equipment controller REC of standard, multiple wireless device RE, wherein,

Each downlink reception unit, is respectively used to by between each wireless device described and described beam splitter The optical fiber connected, only receives one's own descending son according to described lower line identifier from described downstream signal Signal；

Signal transmission apparatus the most according to claim 9, it is characterised in that described each is wireless Equipment respectively further comprises: time-delay calculation unit, wherein,

Each time-delay calculation unit, is respectively used to calculate according to the one's own descending subsignal received Propagation delay time, described propagation delay time is for when each wireless device described is to described radio equipment controller Described up subsignal is revised, to ensure that each wireless device described is with described nothing when sending up subsignal Transmitted in both directions time delay between line device controller is identical.

11. according to the signal transmission apparatus described in claim 9 or 10, it is characterised in that described wireless Device controller also includes: range cells, wherein,

Described range cells, for opening station or sending out when the wireless device being subordinated to described radio equipment controller During raw fault, open ranging window.

12. 1 kinds of beam splitters, it is characterised in that including:

First receives unit, for receiving the wireless device using common public radio interface CPRI standard The downstream signal of controller REC broadcast, passes through light between described radio equipment controller and described beam splitter Fine connection, described downstream signal includes multiple descending subsignal, and each descending subsignal carries One lower line identifier, described lower line identifier is for representing which wireless device a descending subsignal is belonging to RE's；

First transmission unit, is used for downstream signal described in multiple broadcast by wireless devices, so that the plurality of Wireless device the most only receives one's own descending son according to described lower line identifier from described downstream signal Signal, described beam splitter is individually connected with each wireless device by optical fiber respectively, the plurality of wireless sets Standby clock keeps Tong Bu with the clock of described radio equipment controller respectively；

13. 1 kinds of signal transmission systems, it is characterised in that including: as arbitrary in claim 9 to 11 Signal transmission apparatus described in Xiang, beam splitter as claimed in claim 12.

14. signal transmission systems according to claim 13, it is characterised in that described signal transmits System, except including beam splitter as claimed in claim 12, also includes: another beam splitter, wherein,

Described radio equipment controller is connected with described beam splitter by optical fiber, described beam splitter and described separately Being connected by optical fiber between one beam splitter, described beam splitter is respectively by optical fiber and multiple wireless devices Part radio apparatus individually connects, and another beam splitter described is respectively by optical fiber and multiple wireless devices Remaining wireless device individually connects.