CN1661941A - Distributed base stations and data interactive method - Google Patents
Distributed base stations and data interactive method Download PDFInfo
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- CN1661941A CN1661941A CN2004100045827A CN200410004582A CN1661941A CN 1661941 A CN1661941 A CN 1661941A CN 2004100045827 A CN2004100045827 A CN 2004100045827A CN 200410004582 A CN200410004582 A CN 200410004582A CN 1661941 A CN1661941 A CN 1661941A
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Abstract
The base station system includes base band and more than one radio frequency zoom out units. Main multiplexing and demultiplexing module and standby multiplexing and demultiplexing module in use for wavelength division multiplexing of optical signal in multiple wavelength are setup at side of base band. Module of optical add and drop multiplexer is setup at each radio frequency zoom out unit. Through two optical fiber links in opposite directions, base band and radio frequency zoom out unit are connected as ring topology net of wavelength division multiplexing. The invention also discloses data interaction method based on distribution type base station system. Data are transmitted at both direction of wavelength division multiplexing ring westwards and eastwards. Thus, data transmission bandwidth of each radio frequency zoom out unit is raised. Features are: simplified structural design, raised reliability of network caused by natural repaired rearranging protection mechanism.
Description
Technical field
The present invention relates to the base station networking technology in the wireless communication system, be meant a kind of distributed base station group network system and data interactive method especially.
Background technology
Along with the development of 3G (Third Generation) Moblie (3G) technology, the method for designing of base station trends towards base band, and (BB BaseBand) separates with radio frequency.Remote Radio Unit (RRU, Remote Radio Unit) is exactly the typical case's application under this design philosophy, and it can solve problems such as machine room addressing difficulty and feeder loss well, improves the transmitting power of antenna opening.But it also brings some new problem to be solved to be arranged, and wherein one of sixty-four dollar question is exactly a transmission group net problem between BB and the RRU.
Interface signal between BB and the RRU is the IQ signal, and speed ratio is higher, generally adopts light directly to transmit as media, again because IQ semaphore request transmission delay is smaller, so should not adopt synchronous digital hierarchy (SDH) transmission.
Referring to shown in Figure 1, be the distributed base station system structural representation of the present annular networking scheme that generally adopts, each node on the structure ring of this network construction form all has the light mouth of both direction, and main mouth and the standby light mouth used up arranged on the BB; East orientation Guang Kou and west are arranged to the light mouth on each RRU, east orientation light mouth directly or indirectly is connected to BB master and uses up mouth, and the west directly or indirectly is connected to the standby light mouth of BB to the light mouth.
During base station system operate as normal shown in Figure 1, at down direction, BB will mail to ring and go up the downstream interface data of all RRU electrical interface signals forms and utilize frame structure multiplexing and be converted to the light signal of certain wavelength, deliver to RRU0 by the main mouth of using up, RRU0 receives the downlink optical signal that BB sends by east orientation light mouth, be reduced to the interface data of electrical interface signals form, the downstream interface data that therefrom intercept out this node are handled, and after remaining data is converted to light signal, be forwarded to the RRU of next stage to the light mouth by the west, later RRU finishes identical functions successively, receives the downstream interface data of this RRU from east orientation light mouth up to RRUn.
Up direction, after RRUn is converted to light signal with the upstream Interface data, send the upstream Interface data by east orientation light mouth, RRUn-1 receives the upstream Interface data that RRUn sends from the west to the light mouth, in these upstream Interface data, insert the upstream Interface data of this node, send by east orientation light mouth, later RRU finishes identical functions successively, receives the upstream Interface data of each RRU of ring from east orientation light mouth up to BB.
When the system failure, for example: fiber failure between RRUn-1 and the RRUn, BB and RRU0 ..., the transmission of downlink and uplink interfaces data remains unchanged between the RRUm-1, remains each RRU and uses up mouthful transmitting-receiving downlink and uplink interfaces data by east orientation light mouth and BB master; But BB and RRUm ..., between the RRUn transmission of downlink and uplink interfaces data then with fault before opposite, promptly each RRU receives and dispatches the downlink and uplink interfaces data by the west to the standby light mouth of light mouth and BB.
Because the frame structure that existing this annular networking scheme need design more complicated with the data multiplex of each RRU together, the branch that each RRU also needs to finish the Frame one-level is inserted and multiplexing function, makes the function design of each RRU interface very complicated; In addition, transmit, the bandwidth of each RRU need be restricted, cause the Internet resources anxiety, influence data transmission bauds because the data transmit-receive of last all RRU of ring is all shared the bandwidth of same wavelength.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of distributed base station system, solves the too complicated and limited problem of data transfer bandwidth of RRU interface function in the prior art.
Another object of the present invention provides a kind of data interactive method based on distributed base station system of the present invention, and the normal data in the realization system between each network equipment is mutual.
According to first purpose a kind of distributed base station system disclosed by the invention, include base band and more than one Remote Radio Unit, base band and Remote Radio Unit connect into the ring topology net by two opposite optical fiber links of direction, be provided with in the base band side and be used for the main of multiple wavelength optical signal wavelength division multiplexing, be provided with in each Remote Radio Unit side and comprise east orientation Guang Kou and west OADM module to the light mouth with multiplexing and demultiplexing module and standby multiplexing and demultiplexing module;
After the downlink electrical interface signal that base band will send to each Remote Radio Unit is converted to wavelength optical signals, send into main respectively with multiplexing and demultiplexing module and standby multiplexing and demultiplexing module;
Main with the multiplexing and demultiplexing module downlink optical signal of different wave length is closed the east orientation light mouth that is sent to the OADM module of each Remote Radio Unit side behind the ripple along an optical fiber link step by step, standby multiplexing and demultiplexing module is closed behind the ripple downlink optical signal along another optical fiber link and is sent to the west of OADM module of each Remote Radio Unit side step by step to the light mouth;
Each OADM module is sent into Remote Radio Unit from east orientation Guang Kou and west to the light signal that the light mouth takes out local wavelength, and Remote Radio Unit is converted to electrical interface signals with light signal;
After the up electrical interface signals that each Remote Radio Unit will send to base band is converted to local wavelength uplink optical signal, send into local OADM module;
OADM module closes behind the ripple local wavelength uplink optical signal and other wavelength light signal that receives from east orientation light mouth by self west and along an optical fiber link uplink optical signal is sent to the standby multiplexing and demultiplexing module of base band to the light mouth, and OADM module is with local wavelength uplink optical signal and the main multiplexing and demultiplexing module of using that along another optical fiber link uplink optical signal is sent to base band from the west after other wavelength light signal that the light mouth receives closes ripple by self east orientation light mouth;
The main uplink optical signal demultiplexing that will receive separately respectively with multiplexing and demultiplexing module and standby multiplexing and demultiplexing module is to send into base band behind the different wave length light signal, and base band is converted to electrical interface signals with light signal.
The described primary and backup multiplexing and demultiplexing module of this system is the multiplexing and demultiplexing module that is used for the multiplexing and demultiplexing module of Coarse Wavelength Division Multiplexing or is used for dense wave division multipurpose.
The described multiplexing and demultiplexing module of this system is the multiplexer and demultiplexer that is used for the multiplexer and demultiplexer of Coarse Wavelength Division Multiplexing or is used for dense wave division multipurpose; Described OADM module is an optical add/drop multiplexer.
It is inner or outside that the described primary and backup multiplexing and demultiplexing module of this system is arranged on base band; It is inner or outside that described OADM module is arranged on Remote Radio Unit.
Further comprise at least one optical relay unit on the described optical fiber link of this system.
Data interactive method according to described another purpose the present invention disclosed a kind of distributed base station system of while, in the ring topology distributed base station system that is applied to connect into by two opposite optical fiber links of direction, be provided with in the base band side of distributed base station group network system and be used for the main of multiple wavelength optical signal wavelength division multiplexing with multiplexing and demultiplexing module and standby multiplexing and demultiplexing module by base band and Remote Radio Unit; Be provided with OADM module in each Remote Radio Unit side;
For each Remote Radio Unit on every optical fiber link distributes an optical wavelength that is used to carry data;
Comprise to the data transmission procedure that Remote Radio Unit sends the down direction of data in base band:
A) described base band is sent into east orientation downlink optical signal and west that all downlink electrical interface signals that mail to Remote Radio Unit are converted to corresponding distribution wavelength main with multiplexing and demultiplexing module and standby multiplexing and demultiplexing module respectively to downlink optical signal;
B) mainly with the multiplexing and demultiplexing module all east orientation downlink optical signals are closed the multiplexing back of ripple and be sent to the east orientation light mouth of each Remote Radio Unit sidelight add-drop multiplexing module on the looped network by an optical fiber link, standby multiplexing and demultiplexing module is closed all west that ripple is multiplexing afterwards to be sent to the west of each Remote Radio Unit sidelight add-drop multiplexing module on the looped network to the light mouth by another optical fiber link to downlink optical signal;
C) OADM module of each Remote Radio Unit side takes out respectively to belong to the downlink optical signal that the light mouth is received with the west from east orientation Guang Kou and self distributes the downlink optical signal of wavelength to send into Remote Radio Unit;
D) Remote Radio Unit selects one the tunnel to be converted to electrical interface signals and to carry out data processing from the two-way downlink optical signal that OADM module is sent into;
Comprise at the data transmission procedure of Remote Radio Unit to the up direction of baseband sending data:
A ') each Remote Radio Unit is converted to corresponding distribution wavelength east orientation uplink optical signal and the western OADM module of sending into this locality to uplink optical signal respectively with the up electrical interface signals that needs mail to base band;
B ') OADM module with the west of this locality to uplink optical signal and east orientation downlink optical signal beyond this locality that receives from east orientation light mouth close ripple multiplexing after, send by the standby multiplexing and demultiplexing module of an optical fiber link from the west to the light mouth to the base band side, with the east orientation uplink optical signal of this locality with from the west to the west beyond this locality that the light mouth receives to downlink optical signal close ripple multiplexing after, send with the multiplexing and demultiplexing module to the main of base band side by another optical fiber link from east orientation light mouth;
C ') the base band side main with multiplexing and demultiplexing module and standby multiplexing and demultiplexing module respectively from the east orientation uplink optical signal received and western to uplink optical signal demultiplexing send into base band after going out the uplink optical signal of each Remote Radio Unit;
D ') base band selection one tunnel from the two-way uplink optical signal of main each Remote Radio Unit of being sent into multiplexing and demultiplexing module and standby multiplexing and demultiplexing module is converted to electrical interface signals and carries out data processing.
The described optical wavelength of distributing for each Remote Radio Unit of this method is the concentrated wavelength of stipulating in International Telecommunications Union's standard of wavelength available.
This method is identical for same Remote Radio Unit is used to carry data for it distributed in two optical fiber links optical wavelength.
The described multiplexing and demultiplexing module of this method is the multiplexing and demultiplexing module that is used for the multiplexing and demultiplexing module of Coarse Wavelength Division Multiplexing or is used for dense wave division multipurpose.
This method step c) and d) further comprise: whether the two-way downlink optical signal that Remote Radio Unit detection add-drop multiplexing module is sent into is normal, and testing result is sent to base band;
Steps d ') specifically comprise: whether baseband-detection master is normal with the two-way uplink optical signal of each Remote Radio Unit that multiplexing and demultiplexing module and standby multiplexing and demultiplexing module are sent into, and the testing result sent of received RF extension unit, base band is selected one group of normal up-downgoing light signal, uplink optical signal wherein is converted to the laggard line data processing of electrical interface signals, and, notify it to receive selected downlink optical signal to this Remote Radio Unit transmission instruction message;
And described step d) specifically comprises: Remote Radio Unit receives the described instruction message that base band is sent, and specified downlink optical signal is converted to the laggard line data processing of electrical interface signals in the selection message.
This method step d ') described base band selects one group of normal up-downgoing light signal specifically to comprise:
D ' 1) if the two-way downlink optical signal of a Remote Radio Unit all normally, and this Remote Radio Unit is also all normal at the two-way uplink optical signal of base band side, and then base band is therefrom selected the minimum uplink and downlink light signal of time-delay between one group of downlink and uplink interfaces data;
D ' 2) if the two-way downlink optical signal of a Remote Radio Unit and in the two-way uplink optical signal of base band side, have the light signal more than a road or a tunnel undesired, then base band is preferential in normal light signal would select one group of uplink and downlink light signal that the up-downgoing transmission path is just in time opposite.
This method is just in time opposite according to up-downgoing optical signal transmission path in advance, and therefrom preferentially select the principle of time-delay minimum between the downlink and uplink interfaces data to be provided with under the different testing result situations, the correspondence table of the downlink optical signal that uplink optical signal that base band should be selected and Remote Radio Unit should be selected is kept in the base band;
Steps d ' 1 then) described base band selects therefrom that the minimum uplink and downlink light signal process of time-delay specifically comprises between one group of downlink and uplink interfaces data: base band is turn-offed one road downlink optical signal, select one group of corresponding in such cases uplink and downlink light signal according to correspondence table, base band is measured under this kind selection, and base band is to the interface data delay value between the Remote Radio Unit uplink and downlink light signal;
Base band is recovered last road downlink optical signal and is turn-offed another road downlink optical signal, select one group of corresponding in such cases uplink and downlink light signal according to correspondence table, base band is measured under this kind selection, and base band is to the interface data delay value between the Remote Radio Unit uplink and downlink light signal;
The interface data delay value that records under two kinds of selections of base band comparison is selected one group of less uplink and downlink light signal of delay value;
Steps d ' 2) described base band selects one group of just in time opposite uplink and downlink light signal process of up-downgoing transmission path specifically to comprise in normal light signal: one group of uplink and downlink light signal that base band is searched in correspondence table and selection and present case are mated.
The described Remote Radio Unit of this method sends testing result by network physical course base band; Described base band sends instruction message by network physical course Remote Radio Unit.
From above as can be seen, a kind of distributed base station system provided by the invention and data interactive method thereof, utilize wavelength-division multiplex technique, be provided for the main of multiple wavelength optical signal wavelength division multiplexing in the base band side with multiplexing and demultiplexing module and standby multiplexing and demultiplexing module, be provided with OADM module in each Remote Radio Unit side, BB and RRU are connected into the annular networking structure of wavelength division multiplexing by two opposite optical fiber links of direction, when having improved the data transfer bandwidth of each RRU greatly, make the structural design of the network equipment in each system obtain simplifying, reduce the cost of the network equipment, improved data transmission bauds again.In data exchange process; utilize the characteristics of looped network technology; transfer of data is carried out in east orientation and west at the wavelength division multiplexing ring simultaneously on optical fiber link; and by taking new self-healing to switch protection mechanism; between safeguards system equipment, in the normal data interaction, make the reliability of network be further enhanced.
Description of drawings
Fig. 1 adopts the schematic diagram of annular networking structure for existing distributed base station system;
Fig. 2 is the structural representation of the distributed base station system of the embodiment of the invention;
Fig. 3 carries out the data transmit-receive schematic diagram of OADM for RRU side in the embodiment of the invention;
Schematic diagram was switched in optical fiber link self-healing when Fig. 4 the 2nd kind of situation occurred for the embodiment of the invention;
Schematic diagram was switched in optical fiber link self-healing when Fig. 5 the 3rd kind of situation occurred for the embodiment of the invention;
Schematic diagram was switched in optical fiber link self-healing when Fig. 6 the 4th kind of situation occurred for the embodiment of the invention;
Schematic diagram was switched in optical fiber link self-healing when Fig. 7 the 5th kind of situation occurred for the embodiment of the invention;
Schematic diagram was switched in optical fiber link self-healing when Fig. 8 the 6th kind of situation occurred for the embodiment of the invention;
Schematic diagram was switched in optical fiber link self-healing when Fig. 9 the 7th kind of situation occurred for the embodiment of the invention.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
The present invention program adopts the annular networking structure, utilize wavelength-division multiplex technique, be provided for the main of multiple wavelength optical signal wavelength division multiplexing in the base band side with multiplexing and demultiplexing module and standby multiplexing and demultiplexing module, be provided with OADM module in each Remote Radio Unit side, two optical fiber links opposite by direction connect into the wavelength division multiplexing ring with BB and RRU.And by the data transfer path between reasonable Arrangement BB and RRU, each RRU of reasonable distribution is used for the wavelength of transfer of data.When solving the limited problem of data transfer bandwidth, the structure of each network equipment is simplified, and by utilizing looped network technology and new self-healing to switch the reliability that protection mechanism has ensured network.
Because Coarse Wavelength Division Multiplexing (CWDM, Coarse Wavelength Division Multiplexing) technology is more a kind of optical transport technology of recent application, it can improve the utilance of optical fiber at lower cost, so adopts CWDM looped network technology to carry out networking to RRU in the present embodiment.
The distributed base station system structure of present embodiment is referring to shown in Figure 2.In the BB side, be provided with two optical multiplexed signals that are used to realize each wavelength with and the multiplexing demultiplexing device (MUX/DMUX) of demultiplexing, wherein MUX/DMUX0 leads that to use module, MUX/DMUX1 be spare module.In the RRU side, be provided with the Optical Add Drop Multiplexer function that optical add/drop multiplexer (OADM) is used to realize relevant wavelength.Two pairs of light mouths are arranged on each OADM, and a pair of light mouth directly or indirectly is connected to MUX/DMUX0, be mainly used in and MUX/DMUX0 between data transmit-receive, another directly or indirectly is connected to MUX/DMUX1 to the light mouth, be mainly used in and MUX/DMUX1 between data transmit-receive.Two optical fiber links of counter clockwise direction clockwise and the dotted line representative by solid line representative among Fig. 2 between two pairs of light mouths of MUX/DMUX0, MUX/DMUX1 and RRU side OADM couple together.
In embodiments of the present invention, regulation BB is a down direction to the data transmission direction of RRU; RRU is a up direction to the data transmission direction of BB.OADM is an east orientation with the main direction that directly or indirectly links to each other with MUX/DMUX; The direction that OADM and standby MUX/DMUX directly or indirectly link to each other for the west to.The a pair of light mouth that directly or indirectly is connected to MUX/DMUX0 on the OADM is an east orientation light mouth; The a pair of light mouth that directly or indirectly is connected to MUX/DMUX1 is that the west is to port.
RRU0 in BB and the distributed base station system, RRU1 ... the electrical interface signals that realizes data interaction between the RRUn is respectively IF0, IF1 ..., IFn.Wherein, IF0 is used for RRU0, and IF1 is used for RRU1 ... the rest may be inferred, and IFn is used for RRUn.When needs when CWDM encircles the transmission of enterprising line data, at first in BB and RRU side, the light signal that BB that needs are sent and the descending and up electrical interface signals IF between the RRU are converted to respective wavelength; During reception, more corresponding light signal is recovered IF.
Therefore, for each RRU, { λ 0 for the wavelength available collection of its CWDM looped network of stipulating from International Telecommunication Association (ITU-T) standard, λ 1, distribute two wavelength among the λ n}, RRU uses one of them wavelength to be used for east orientation receipts and western to sending out the transmission data that are carried on clockwise optical fiber link, and another wavelength is used for the west and sends out the transmission data that are carried on anticlockwise optical fiber link to receipts and east orientation.
The concrete distribution condition of each RRU wavelength in the present embodiment, ginseng is shown in Table 1:
| ???RRU0 | ???RRU1 | …… | ??RRUn | |
| The RRU east orientation is received the west to sending out | ????λ0’ | ????λ1’ | …… | ??λn’ |
| The RRU west is sent out to receiving east orientation | ????λ0” | ????λ1” | …… | ??λn” |
Table 1
Because receiving the west, the east orientation of RRU transmits to sending out to send out by different optical fiber links to the receipts east orientation with the west of RRU, therefore, can distribute same wavelength to sending out for the east orientation receipts west of same RRU with western sending out to the receipts east orientation, promptly in the table 1 for any RRUx (x=0,1,, n) can make λ x '=λ x ".And it is corresponding one by one to sending out the wavelength collection to make wavelength available collection and RRU east orientation receive the west, and to send out the wavelength collection to the receipts east orientation corresponding one by one wavelength available collection and RRU west simultaneously.
Down direction for data: in the BB side, according to the Wavelength Assignment principle in the table 1, it is λ ' and λ that the electrical interface signals IF that BB will come downwards to each RRU is converted to wavelength simultaneously " the two-way downlink optical signal, send into MUX/DMUX0 and MUX/DMUX1 respectively.
With x RRU is example, a) BB will come downwards to RRUx (x=0,1 ..., it is λ x ' and λ x that electrical interface signals IFx n) is converted to wavelength simultaneously " the two-way downlink optical signal, send into MUX/DMUX0 and MUX/DMUX1 respectively.
B) as main MUX/DMUX0 with module with all east orientation downlink optical signal λ 0 ', λ 1 ' ..., λ n ' is combined with each other and delivers to the clockwise direction optical fiber link of CWDM ring; As the MUX/DMUX1 of spare module with all west to downlink optical signal λ 0 ", λ 1 " ..., λ n " and the multiplexing counter clockwise direction optical fiber link of together delivering to the CWDM ring.
When c) downlink optical signal arrived the RRUx side, referring to shown in Figure 3, the OADMx of RRUx side took out the downlink optical signal λ x ' that belongs to self from east orientation light mouth, takes out the downlink optical signal λ x that belongs to self from the west to the light mouth ", send into RRUx.
D) RRUx is from λ x ' and λ x " select one road downlink optical signal to carry out opto-electronic conversion, recover the IFx electrical interface signals.
Up direction for data: a ') in the RRUx side, it is λ x ' and λ x that the up electrical interface signals IFx that RRUx will mail to BB is converted to wavelength simultaneously " the two-way uplink optical signal send into OADMx.
B ') referring to shown in Figure 3, OADMx is with uplink optical signal λ x " with from local west to the light mouth receive except that descending λ x " the light signal λ 0 of all wavelengths "; λ 1 ", λ x-1 "; λ x+1 " ..., λ n " and the multiplexing back counter clockwise direction optical fiber link of sending into the CWDM ring from east orientation light mouth; Simultaneously, OADMx is with uplink optical signal λ x ' and the light signal λ 0 ' of all wavelengths except that λ x ' that receives from east orientation light mouth, λ 1 ',, λ x-1 ', λ x+1 ',, λ n ' sends into multiplexing back the clockwise direction optical fiber link of CWDM ring to the light mouth from the west.
When c ') uplink optical signal arrived the BB side, MUX/DMUX0 was decomposed into wavelength with its uplink optical signal that receives and is respectively λ 0 from counterclockwise optical fiber link ", λ 1 " ..., λ n " n+1 road light signal send into BB; MUX/DMUX1 is decomposed into wavelength with its uplink optical signal that receives and is respectively λ 0 ' from clockwise optical fiber link, λ 1 ' ..., the n+1 road light signal of λ n ' is sent into BB.
D ') BB is from every couple of uplink optical signal λ x " and λ x ' select one to carry out opto-electronic conversion, the up IFx electrical interface signals that recovers the pairing RRUx of this signal is handled.
Described in the above distributed base station group network system of the present invention in the course of the work, BB need be from two-way uplink optical signal λ x ' and the λ x of each RRUx " select one road light signal to revert to up electrical interface signals IFx; Each RRUx need be from two-way downlink optical signal λ x ' and λ x " select one road light signal to revert to downlink electrical interface signal IFx.
In order to guarantee best laser propagation effect, present embodiment requires BB, RRU carrying out must following following two constraint conditions when light signal is selected:
1, BB, RRUx (x=0,1 ..., n) between between transmission delay and BB, the RRUx of upstream Interface data the transmission delay of downstream interface data consistent as far as possible, it is just in time opposite to show as transmission path.
2, BB, RRUx (x=0,1 ..., n) between between the transmission delay of upstream Interface data and BB, the RRU transmission delay of downstream interface data as much as possible little.
The priority of condition 1 is higher than the priority of condition 2, promptly must at first satisfy condition 1, satisfies condition 2 more then on 1 the basis of satisfying condition.
According to above-mentioned two constraintss, BB that present embodiment is formulated and the light signal selection scheme of RRU, ginseng is shown in Table 2.
| BB detects the two-way uplink optical signal | RRUx detects the two-way downlink optical signal | The uplink optical signal that BB selects | The downlink optical signal that RRUx selects | |||
| ????λ x’ | ????λ x” | ????λ x’ | ????λ x” | |||
| ??1 | Normally | Normally | Normally | Normally | Select minimum time-delay path | |
| ??2 | Fault | Normally | Normally | ????-- | ??λ x” | ??λ x’ |
| ????3 | ????-- | Normally | Normally | Fault | ????λ x” | ????λ x’ |
| ????4 | Normally | Fault | ????-- | Normally | ????λ x’ | ????λ x” |
| ????5 | Normally | ????-- | Fault | Normally | ????λ x’ | ????λ x” |
| ????6 | Normally | Fault | Normally | Fault | ????λ x’ | ????λ x’ |
| ????7 | Fault | Normally | Fault | Normally | ????λ x” | ????λ x” |
Table 2
And the light signal selection scheme shown in the table 2 is kept among the BB, BB and RRU are carrying out light signal when selecting, and specifically comprise following process:
In the BB side, BB detects the λ 0 ' of uplink optical signal, λ 1 ' ..., λ n ' and λ 0 ", λ 1 " ..., λ n " whether normal.
In the RRU side, each RRUx detects downlink optical signal λ x ' and λ x " whether normal, and testing result reported BB by physical layer or alternate manner.
The processing that BB did comprises following 7 kinds of situations according to table 2:
If 1 BB detects uplink optical signal λ x ' and the λ x of RRUx " all normal; and RRUx detects downlink optical signal λ x ' and λ x " also all normal, then BB and RRUx select the transmission path of one group of transmission delay minimum between the downlink and uplink interfaces data, and detailed process comprises:
A.BB turn-offs descending λ x " light signal, according to the 3rd kind of light signal selection principle in the table 2, BB selects up λ x " light signal, and RRUx selects descending λ x ' light signal, and the propagation delay time of up-downgoing data between BB measures from BB to RRUx is established this value and is T0.
B.BB recovers descending λ x " light signal; BB turn-offs descending λ x ' light signal then; according to the 5th kind of light signal selection principle in the table 2; BB selects up λ x ' light signal; RRUx selects descending λ x " light signal, BB measures the propagation delay time from BB to RRUx, establishes this value and is T1, and BB recovers descending λ x ' light signal.
C.BB compares T0 and T1, and when T0≤T1, BB selects up λ x " light signal, and BB sends instruction message notice RRUx by physical layer to RRUx and selects descending λ x ' light signal; When T0＞T1, BB selects up λ x ' light signal, and BB sends instruction message notice RRUx by physical layer to RRUx and selects descending λ x " light signal.
2, referring to shown in Figure 4, BB detects uplink optical signal λ x " normal; but uplink optical signal λ x ' fault; it is normal that RRUx detects downlink optical signal λ x '; after BB receives the testing result that RRU reports, no matter downlink optical signal λ x " whether normal, by question blank 2, BB will select uplink optical signal λ x ", and to RRUx transmission instruction message notice RRUx selection uplink optical signal λ x '.
3, referring to shown in Figure 5, it is normal that RRUx detects downlink optical signal λ x ', but downlink optical signal λ x " fault; BB detects uplink optical signal λ x " normal, after BB receives the testing result that RRU reports, no matter whether uplink optical signal λ x ' is normal, by question blank 2, BB selects uplink optical signal λ x ", and to RRUx transmission instruction message notice RRUx selection uplink optical signal λ x '.
4, referring to shown in Figure 6, it is normal that BB detects uplink optical signal λ x ', but uplink optical signal λ x " fault; RRUx detects downlink optical signal λ x " normal, after BB receives the testing result that RRU reports, no matter whether downlink optical signal λ x ' is normal, by question blank 2, BB selects uplink optical signal λ x ', and sends instruction message notice RRUx selection uplink optical signal λ x to RRUx ".
5, referring to shown in Figure 7, RRUx detects downlink optical signal λ x " normal; but downlink optical signal λ x ' fault; it is normal that BB detects uplink optical signal λ x '; after BB receives the testing result that RRU reports, by question blank 2, no matter uplink optical signal λ x " whether normal, BB selects uplink optical signal λ x ', and sends instruction message notice RRUx selection uplink optical signal λ x to RRUx ".
6, referring to shown in Figure 8, it is normal that BB detects uplink optical signal λ x ', but uplink optical signal λ x " fault; RRUx detects the normal but downlink optical signal λ x of downlink optical signal λ x ' " fault,, after BB receives the testing result that RRU reports, by question blank 2, BB selects uplink optical signal λ x ', and sends instruction message notice RRUx selection uplink optical signal λ x ' to RRUx.
7, referring to shown in Figure 9, BB detects uplink optical signal λ x " normal; but uplink optical signal λ x ' fault; RRUx detects downlink optical signal λ x " normal, but downlink optical signal λ x ' fault is after BB receives the testing result that RRU reports, by question blank 2, BB selects uplink optical signal λ x ", and to RRUx transmission instruction message notice RRUx selection uplink optical signal λ x ".
In addition, in order to improve data transmission distance, can on optical fiber link, increase optical relay unit such as power amplifier.Under the many situations of distributed base station RRU website, can adopt the MUX/DMUX of dense wave division multipurpose (DWDM) in the BB side, the CWDM technology above the DWDM technology that utilization can multiplexing more multi-wavelength substitutes among the embodiment.It is inner or outside that multiplexing and demultiplexing module of the present invention can be arranged on base band; It is inner or outside that described OADM module can be arranged on Remote Radio Unit equally.
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 distributed base station system, include base band and more than one Remote Radio Unit, base band and Remote Radio Unit connect into the ring topology net by two opposite optical fiber links of direction, it is characterized in that, be provided with in the base band side and be used for the main of multiple wavelength optical signal wavelength division multiplexing, be provided with in each Remote Radio Unit side and comprise east orientation Guang Kou and west OADM module to the light mouth with multiplexing and demultiplexing module and standby multiplexing and demultiplexing module;
After the downlink electrical interface signal that base band will send to each Remote Radio Unit is converted to wavelength optical signals, send into main respectively with multiplexing and demultiplexing module and standby multiplexing and demultiplexing module;
Main with the multiplexing and demultiplexing module downlink optical signal of different wave length is closed the east orientation light mouth that is sent to the OADM module of each Remote Radio Unit side behind the ripple along an optical fiber link step by step, standby multiplexing and demultiplexing module is closed behind the ripple downlink optical signal along another optical fiber link and is sent to the west of OADM module of each Remote Radio Unit side step by step to the light mouth;
Each OADM module is sent into Remote Radio Unit from east orientation Guang Kou and west to the light signal that the light mouth takes out local wavelength, and Remote Radio Unit is converted to electrical interface signals with light signal;
After the up electrical interface signals that each Remote Radio Unit will send to base band is converted to local wavelength uplink optical signal, send into local OADM module;
OADM module closes behind the ripple local wavelength uplink optical signal and other wavelength light signal that receives from east orientation light mouth by self west and along an optical fiber link uplink optical signal is sent to the standby multiplexing and demultiplexing module of base band to the light mouth, and OADM module is with local wavelength uplink optical signal and the main multiplexing and demultiplexing module of using that along another optical fiber link uplink optical signal is sent to base band from the west after other wavelength light signal that the light mouth receives closes ripple by self east orientation light mouth;
The main uplink optical signal demultiplexing that will receive separately respectively with multiplexing and demultiplexing module and standby multiplexing and demultiplexing module is to send into base band behind the different wave length light signal, and base band is converted to electrical interface signals with light signal.
2, system according to claim 1 is characterized in that, described primary and backup multiplexing and demultiplexing module is the multiplexing and demultiplexing module that is used for the multiplexing and demultiplexing module of Coarse Wavelength Division Multiplexing or is used for dense wave division multipurpose.
3, system according to claim 1 is characterized in that, described multiplexing and demultiplexing module is the multiplexer and demultiplexer that is used for the multiplexer and demultiplexer of Coarse Wavelength Division Multiplexing or is used for dense wave division multipurpose; Described OADM module is an optical add/drop multiplexer.
4, system according to claim 1 is characterized in that, it is inner or outside that described primary and backup multiplexing and demultiplexing module is arranged on base band; It is inner or outside that described OADM module is arranged on Remote Radio Unit.
5, system according to claim 1 is characterized in that, further comprises at least one optical relay unit on the described optical fiber link.
6, a kind of data interactive method of distributed base station system, in the ring topology distributed base station system that is applied to connect into by two opposite optical fiber links of direction by base band and Remote Radio Unit, it is characterized in that, be provided with in the base band side of distributed base station group network system and be used for the main of multiple wavelength optical signal wavelength division multiplexing with multiplexing and demultiplexing module and standby multiplexing and demultiplexing module; Be provided with OADM module in each Remote Radio Unit side;
For each Remote Radio Unit on every optical fiber link distributes an optical wavelength that is used to carry data;
Comprise to the data transmission procedure that Remote Radio Unit sends the down direction of data in base band:
A) described base band is sent into east orientation downlink optical signal and west that all downlink electrical interface signals that mail to Remote Radio Unit are converted to corresponding distribution wavelength main with multiplexing and demultiplexing module and standby multiplexing and demultiplexing module respectively to downlink optical signal;
B) mainly with the multiplexing and demultiplexing module all east orientation downlink optical signals are closed the multiplexing back of ripple and be sent to the east orientation light mouth of each Remote Radio Unit sidelight add-drop multiplexing module on the looped network by an optical fiber link, standby multiplexing and demultiplexing module is closed all west that ripple is multiplexing afterwards to be sent to the west of each Remote Radio Unit sidelight add-drop multiplexing module on the looped network to the light mouth by another optical fiber link to downlink optical signal;
C) OADM module of each Remote Radio Unit side takes out respectively to belong to the downlink optical signal that the light mouth is received with the west from east orientation Guang Kou and self distributes the downlink optical signal of wavelength to send into Remote Radio Unit;
D) Remote Radio Unit selects one the tunnel to be converted to electrical interface signals and to carry out data processing from the two-way downlink optical signal that OADM module is sent into;
Comprise at the data transmission procedure of Remote Radio Unit to the up direction of baseband sending data:
A ') each Remote Radio Unit is converted to corresponding distribution wavelength east orientation uplink optical signal and the western OADM module of sending into this locality to uplink optical signal respectively with the up electrical interface signals that needs mail to base band;
B ') OADM module with the west of this locality to uplink optical signal and east orientation downlink optical signal beyond this locality that receives from east orientation light mouth close ripple multiplexing after, send by the standby multiplexing and demultiplexing module of an optical fiber link from the west to the light mouth to the base band side, with the east orientation uplink optical signal of this locality with from the west to the west beyond this locality that the light mouth receives to downlink optical signal close ripple multiplexing after, send with the multiplexing and demultiplexing module to the main of base band side by another optical fiber link from east orientation light mouth;
C ') the base band side main with multiplexing and demultiplexing module and standby multiplexing and demultiplexing module respectively from the east orientation uplink optical signal received and western to uplink optical signal demultiplexing send into base band after going out the uplink optical signal of each Remote Radio Unit;
D ') base band selection one tunnel from the two-way uplink optical signal of main each Remote Radio Unit of being sent into multiplexing and demultiplexing module and standby multiplexing and demultiplexing module is converted to electrical interface signals and carries out data processing.
7, method according to claim 6 is characterized in that, described optical wavelength of distributing for each Remote Radio Unit is the concentrated wavelength of stipulating in International Telecommunications Union's standard of wavelength available.
8, method according to claim 6 is characterized in that, the optical wavelength that is used to carry data for same Remote Radio Unit in two optical fiber links for it distributed is identical.
9, method according to claim 6 is characterized in that, described multiplexing and demultiplexing module is the multiplexing and demultiplexing module that is used for the multiplexing and demultiplexing module of Coarse Wavelength Division Multiplexing or is used for dense wave division multipurpose.
10, method according to claim 6 is characterized in that, step c) and d) between further comprise: whether Remote Radio Unit detects the two-way downlink optical signal that add-drop multiplexing module sends into normal, and testing result is sent to base band;
Steps d ') specifically comprise: whether baseband-detection master is normal with the two-way uplink optical signal of each Remote Radio Unit that multiplexing and demultiplexing module and standby multiplexing and demultiplexing module are sent into, and the testing result sent of received RF extension unit, base band is selected one group of normal up-downgoing light signal, uplink optical signal wherein is converted to the laggard line data processing of electrical interface signals, and, notify it to receive selected downlink optical signal to this Remote Radio Unit transmission instruction message;
And described step d) specifically comprises: Remote Radio Unit receives the described instruction message that base band is sent, and specified downlink optical signal is converted to the laggard line data processing of electrical interface signals in the selection message.
11, method according to claim 10 is characterized in that, steps d ') described base band selects one group of normal up-downgoing light signal specifically to comprise:
D ' 1) if the two-way downlink optical signal of a Remote Radio Unit all normally, and this Remote Radio Unit is also all normal at the two-way uplink optical signal of base band side, and then base band is therefrom selected the minimum uplink and downlink light signal of time-delay between one group of downlink and uplink interfaces data;
D ' 2) if the two-way downlink optical signal of a Remote Radio Unit and in the two-way uplink optical signal of base band side, have the light signal more than a road or a tunnel undesired, then base band is preferential in normal light signal would select one group of uplink and downlink light signal that the up-downgoing transmission path is just in time opposite.
12, method according to claim 11, it is characterized in that, just in time opposite according to up-downgoing optical signal transmission path in advance, and therefrom preferentially select the principle of time-delay minimum between the downlink and uplink interfaces data to be provided with under the different testing result situations, the correspondence table of the downlink optical signal that uplink optical signal that base band should be selected and Remote Radio Unit should be selected is kept in the base band;
Steps d ' 1 then) described base band selects therefrom that the minimum uplink and downlink light signal process of time-delay specifically comprises between one group of downlink and uplink interfaces data: base band is turn-offed one road downlink optical signal, select one group of corresponding in such cases uplink and downlink light signal according to correspondence table, base band is measured under this kind selection, and base band is to the interface data delay value between the Remote Radio Unit uplink and downlink light signal;
Base band is recovered last road downlink optical signal and is turn-offed another road downlink optical signal, select one group of corresponding in such cases uplink and downlink light signal according to correspondence table, base band is measured under this kind selection, and base band is to the interface data delay value between the Remote Radio Unit uplink and downlink light signal;
The interface data delay value that records under two kinds of selections of base band comparison is selected one group of less uplink and downlink light signal of delay value;
Steps d ' 2) described base band selects one group of just in time opposite uplink and downlink light signal process of up-downgoing transmission path specifically to comprise in normal light signal: one group of uplink and downlink light signal that base band is searched in correspondence table and selection and present case are mated.
13, method according to claim 10 is characterized in that, described Remote Radio Unit sends testing result by network physical course base band; Described base band sends instruction message by network physical course Remote Radio Unit.
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