CN102065343B - Wavelength selection method, device and system - Google Patents
Wavelength selection method, device and system Download PDFInfo
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- CN102065343B CN102065343B CN200910211918XA CN200910211918A CN102065343B CN 102065343 B CN102065343 B CN 102065343B CN 200910211918X A CN200910211918X A CN 200910211918XA CN 200910211918 A CN200910211918 A CN 200910211918A CN 102065343 B CN102065343 B CN 102065343B
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Abstract
The embodiment of the invention discloses a wavelength selection method, a wavelength selection device and a wavelength selection system, relates to the field of optical integration and solves the technical problem that the conventional equipment is greatly modified in the process of transmitting common public radio interface (CPRI) optical signals through an optical distribution network (ODN) inthe prior art. The method in the embodiment of the invention comprises the following steps of: configuring the receiving wavelength of an optical module as a first uplink wavelength according to a wavelength allocation list; acquiring uplink detection information for indicating whether an uplink optical signal reflected by a partial reflector is detected on the first uplink wavelength; if the acquired uplink detection information indicates that the reflected uplink optical signal is not detected, configuring the receiving wavelength of the optical module as a corresponding first downlink wavelength; acquiring downlink detection information; and if the acquired downlink detection information indicates that a downlink optical signal is detected, configuring the transmitting wavelength of the optical module as the first uplink wavelength. The embodiment of the invention is mainly applied to wavelength division multiplexing (WDM) scenes.
Description
Technical field
The present invention relates to optical communication technique, relate in particular to a kind of Wavelength selecting method, Apparatus and system.
Background technology
Common public radio interface (Common Public Radio Interface, CPRI) be (the Radio Equipment Controller of radio equipment controller in the wireless base station device, REC) and the wireless device in the access device (Radio Equipment, RE) interface standard between.The link of CPRI refers to the two-way link between direct-connected REC and RE or two the RE nodes.The CPRI link comprises master port, two-way link and from port.From the master port of CPRI link to being down direction from port direction; Is up direction from the CPRI link from port to the master port direction.
What REC and RE adopted is point-to-point communication.When RE and REC set up the CPRI link, for the port working speed that guarantees REC and RE is consistent, REC and RE need carry out line speed and consult (the following rate consulation that all is called for short).Rate consulation generally carries out when CPRI major state machine is in synchronous regime.
In present CPRI used, REC and RE generally used the optical module of fixed wave length and the light signals of two fine transmission up-downgoing speed, i.e. optical fiber of each direction, and in optical fiber only with a fixed wave length transmitting optical signal.But this method need be every couple of REC of operator and the corresponding two fibres of RE configuration, cost height, not easy care.
In order to reduce this cost, some operator has proposed to utilize existing EPON (PassiveOptical Network, PON) (the Optical Distribution Network of the Optical Distribution Network in, ODN) scheme of transmission CPRI light signal is every couple of REC and the corresponding two fine demands of RE configuration again in order to save.In this scheme, some REC can be concentrated and be placed on local side; RE is distributed in each user place or place, each base station.(Wavelength DivisionMultiplexing, WDM) mode utilizes the optical fiber that connects among the ODN to transmit to the light signal that transmits between each REC and each RE with wavelength division multiplexing.Be illustrated in figure 1 as the part system schematic of utilizing ODN to realize the CPRI optical signal transmission.Wherein, REC in Fig. 1, be specially indoor baseband processing unit (Build Base band Unite, BBU), RE be specially remote radio unit (RRU) (RemoteRadio Unite, RRU).Corresponding REC and the CPRI link between the RE use a pair of wavelength to be respectively applied to the uplink downlink transmitting optical signal.For example: can pass through λ between BBU1 and the RRU1
D1Transmit descending CPRI light signal, pass through λ
U1Transmit up CRPI light signal.REC can adopt the optical module of specific transmitting-receiving wavelength, i.e. the optical module of fixed wave length; RE can adopt the tunable optical module, and optical module all can adopt the encapsulation of supporting the hot plug function.After light signal sends from each REC, through behind the WDM, the wavelength multiplexing of the light signal that transmits on each CPRI link arrives together, before arriving corresponding RE, in order to solve the problem that the wavelength conflict does not take place for REC and non-corresponding RE, the employing scheme in the existing technology be REC and RE CPRI synchronously with the wavelength configuration of rate consulation stage by the tunable optical module of protocol interaction realization RE.
State in realization in the process of utilizing ODN transmission CPRI light signal, need the support of the software and hardware of REC and RE.Because REC and RE deployment at present is commonplace, adopts this scheme will need to change existing REC and RE equipment, causes equipment is changed greatly, implement and popularize the problem of difficulty.
Summary of the invention
Embodiments of the invention provide a kind of method, Apparatus and system of selecting wavelength, by equipment is carried out less change, are embodied as the purpose that REC and RE select suitable wavelength.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of method of selecting wavelength comprises:
Reception wavelength according to Wavelength Assignment table configuration optical module is the first up wavelength;
Obtain whether indication detects the uplink optical signal of partially reflecting mirror reflected back on the described first up wavelength up detection information;
If the up detection information indication of obtaining does not detect the uplink optical signal of described reflected back, then dispose the reception wavelength of described optical module according to described Wavelength Assignment table and be first downstream wavelength of correspondence;
Obtain whether indication detects downlink optical signal on described first downstream wavelength descending detection information;
If described descending detection information indication of obtaining detects downlink optical signal, then the emission wavelength that disposes described optical module according to described Wavelength Assignment table is the described first up wavelength.
A kind of device of selecting wavelength comprises:
The Wavelength Assignment table, at least one pair of the first up wavelength and first downstream wavelength of binding mutually of determining when being used for being recorded in the network planning;
The wavelength configuration module, the reception wavelength that is used for according to Wavelength Assignment table configuration optical module is the first up wavelength;
The optical signal detecting module, be used for obtaining whether indication detects the uplink optical signal of partially reflecting mirror reflected back on the described first up wavelength up detection information, and obtain whether indication detects downlink optical signal on described first downstream wavelength descending detection information;
Described wavelength configuration module also is used for, when the up detection information indication that gets access to when described optical signal detecting module did not detect the uplink optical signal of described reflected back, then the reception wavelength that disposes described optical module according to described Wavelength Assignment table was the first corresponding downstream wavelength; When the descending detection information indication that gets access to when described optical signal detecting module detected downlink optical signal, the emission wavelength that disposes described optical module according to described Wavelength Assignment table was the described first up wavelength.
A kind of system of selecting wavelength comprises:
Partially reflecting mirror is used for uplink optical signal is reflexed to optical module;
Optical module, be used for after being the first up wavelength according to Wavelength Assignment table configuration reception wavelength, obtain whether indication detects the uplink optical signal of partially reflecting mirror reflected back on the described first up wavelength up detection information, if the up detection information indication of obtaining does not detect the uplink optical signal of described reflected back, then dispose the reception wavelength of described optical module according to described Wavelength Assignment table and be first downstream wavelength of correspondence; Obtain whether indication detects downlink optical signal on described first downstream wavelength descending detection information, if described descending detection information indication of obtaining detects downlink optical signal, then the emission wavelength that disposes described optical module according to described Wavelength Assignment table is the described first up wavelength.
The system that a kind of wavelength is selected comprises:
Partially reflecting mirror is used for uplink optical signal is reflexed to optical module;
Optical module, the uplink optical signal that whether receives reflected back for basis is determined up detection information, and sends it to access device;
Access device is used for sending the described first smooth signalization to optical module, and obtaining described up detection information having disposed according to the Wavelength Assignment table after indication receives wavelength and be the first smooth signalization of the first up wavelength; If the up detection information indication of obtaining does not detect the uplink optical signal of described reflected back, then receiving wavelength according to Wavelength Assignment table configuration indication is the second smooth signalization of first downstream wavelength, and sends the described second smooth signalization to optical module; Obtain descending detection information again, if described descending detection information indication of obtaining detects downlink optical signal, be the 3rd smooth signalization of the first up wavelength according to Wavelength Assignment table configuration indication emission wavelength then, and send the described the 3rd smooth signalization to optical module;
Described optical module also is used for according to the indication of described first, second and the 3rd smooth signalization its transmitting-receiving wavelength being set, and determines descending detection information according to whether detecting downlink optical signal in first downstream wavelength, concurrently sends them to described wireless device.
The technical scheme that the embodiment of the invention provides has following beneficial effect: this scheme realizes simple, need not to change existing REC equipment, need not to change existing REC equipment and RE equipment, also less to the change of RE equipment, be convenient to system upgrade and maintenance, make things convenient for the enforcement of scheme with universal; Selecting the device of wavelength can be the tunable optical module, also can be RE, when being that the tunable optical module is, is the hot swappable device owing to carry out the tunable optical module of wavelength selection, therefore also less to the influence that system produces to the change of optical module; And this programme need not to change the CPRI agreement, can with the existing equipment compatibility.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 realizes the system schematic of CPRI optical signal transmission for utilizing ODN in the background technology;
Fig. 2 is the schematic flow sheet of the Wavelength selecting method of the embodiment of the invention 1;
Fig. 3 realizes the system architecture schematic diagram of CPRI optical signal transmission for the ODN that utilizes of the embodiment of the invention 2;
Fig. 4 is the structural representation of the tunable optical module of the embodiment of the invention 2;
Fig. 5 is the schematic flow sheet of the Wavelength selecting method of the embodiment of the invention 2;
Fig. 6 is the method schematic diagram that passes through to arrange in the tunable optical module in advance the reverberation detection threshold of the embodiment of the invention 2;
Fig. 7 is the structural representation of the RRU of the embodiment of the invention 3;
Fig. 8 is the schematic flow sheet of the Wavelength selecting method of the embodiment of the invention 3;
Fig. 9 is the method schematic diagram that passes through to arrange in the tunable optical module in advance the reverberation detection threshold of the embodiment of the invention 3;
Figure 10 is the structural representation of the optical module of the embodiment of the invention 4;
Figure 11 is the structural representation of the RE of the embodiment of the invention 5;
Figure 12 is the structural representation of system of the selection wavelength of the embodiment of the invention 6;
Figure 13 is the structural representation of system of the selection wavelength of the embodiment of the invention 7.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.And, below each embodiment be possibility of the present invention, embodiment put in order and the numbering execution sequence preferred with it of embodiment irrelevant.
Embodiment 1
Present embodiment provides a kind of method of selecting wavelength, can (Remote Node RN) goes up the mounting portion speculum, in order to the uplink optical signal reflected back RE place in the process that will transmit at the Remote Node RN of ODN before this method is implemented.This method can be deployed on the optical module, also can be deployed on the RE.As shown in Figure 2, this method comprises:
Step 101, the reception wavelength that disposes optical module according to the Wavelength Assignment table is the first up wavelength;
Step 102 is obtained up detection information, and this up detection information is used for being illustrated in the uplink optical signal that whether detects the partially reflecting mirror reflected back on the described first up wavelength;
Step 103, if the up detection information table that obtains is shown in the uplink optical signal that does not detect described reflected back on the described first up wavelength, the reception wavelength that disposes described optical module according to described Wavelength Assignment table is the first corresponding downstream wavelength;
Because when up detection information indication does not detect the uplink optical signal of described reflected back on the described first up wavelength, just represented this configuration first up wavelength is unallocated goes out, that is: may also use this first upgoing wave longer transmission CPRI uplink optical signal without any a pair of REC and RE, illustrate that so then this first up wavelength is available, it can not given birth to wavelength with the upgoing wave long hair that other RE use and conflict.
Step 104 is obtained descending detection information, and this descending detection information is used for being illustrated on described first downstream wavelength whether detect downlink optical signal;
Step 105, if described descending detection information indication of obtaining detects downlink optical signal in described first downstream wavelength, then the emission wavelength that disposes described optical module according to described Wavelength Assignment table is the described first up wavelength.
Because descending detection information indication detects downlink optical signal in described first downstream wavelength, the REC that has just represented this first downstream wavelength of corresponding use starts, also just being equivalent to this first uplink and downlink wavelength can use, that is: Dui Ying RE can use this first downstream wavelength to receive the CPRI downlink optical signal.
The method of the selection wavelength that provides in the present embodiment need not to change existing REC equipment, need not to change existing REC equipment and RE equipment; And when this selection function of wavelength partly is deployed on the RE, also less to the change of RE equipment, be convenient to RE upgrading and maintenance; When this selection function of wavelength partly is deployed on the optical module, therefore also less to the influence that system produces to the change of optical module owing to the tunable optical module of carrying out the wavelength selection is the hot swappable device, make things convenient for the enforcement of scheme with universal; And this programme need not to change the CPRI agreement, can with the existing equipment compatibility.
Embodiment 2
Present embodiment specifically provides a kind of Wavelength selecting method, can the RN at ODN before this method is implemented on the mounting portion speculum, in order to the uplink optical signal reflected back RE in the transmission course.System architecture behind the speculum of mounting portion can be as shown in Figure 3.Wherein, REC and RE are specially BBU and the RRU among Fig. 3, and be same, and corresponding BBU and RRU adopt a pair of its uplink optical signal of uplink and downlink wavelength transmission and downlink optical signal.For example: can transmit its descending CPRI light signal by λ d1 between BBU1 and the RRU1, transmit its up CRPI light signal by λ u1.
In fact in BBU, also have optical module, but because the method in the present embodiment need not to change BBU, so in Fig. 3, do not show.Because the method that provides in the present embodiment is applicable to being deployed on the tunable optical module, so schematically show the tunable optical module at RRU place among Fig. 3.In present embodiment and following embodiment, be example with REC and RE specific to BBU and RRU, the method for its execution is described.
Be example below with BBU1, the workflow of BBU comprises in the key diagram 3: after BBU1 starts, enter synchronous regime, select some transmission rates (the normally maximum transmission rate of this BBU1 support), and with this transmission rate transmission CPRI downlink frame, and with phase same rate reception CPRI uplink optical signal, if in preset period of time T1, can receive the CPRI uplink optical signal of phase same rate, then determine and RRU1 between the ingress rate synchronous regime, can carry out follow-up protocol synchronization operation; If in T1, do not receive the CPRI uplink optical signal of phase same rate, then reselect another transmission rate, carry out above-mentioned rate consulation process then again, until the ingress rate synchronous regime.
Wherein, the system of selection of speed is for beginning to select from the highest speed, and changing down gradually is not if minimum speed realizes synchronously that then redirect is returned the highest speed and selected again more yet.
RRU1 with corresponding BBU1 is example below, the workflow of RRU work in the key diagram 3:
The internal structure of the hot swappable tunable optical module at the RRU1 place that provides in the present embodiment can be as shown in Figure 4, and wherein, trans-impedance amplifier/line amplifier (TIA/LA) mainly amplifies the light signal that receives; Adjustable receiver can receive the light signal of specific wavelength, and adjustable transmitter capable can be launched the uplink optical signal of specific wavelength to BBU1.In the present embodiment, adjustable transmitter capable can be supported whole up wavelength, and adjustable receiver can be supported whole uplink and downlink wavelength.
RRU is introduced into holding state after starting, and enters synchronous regime then, and the transmitter of the tunable optical module of its connection starts not luminance.Adjustable receiver is attempted receiving the CPRI downlink optical signal with flank speed, if do not receive the CPRI downlink optical signal of phase same rate, then reselects another transmission rate, and up to minimum speed limit, the circulation that goes round and begins again is until the ingress rate synchronous regime; If in preset period of time T1 ', can receive the CPRI downlink optical signal of phase same rate, then determine and BBU1 ingress rate synchronous regime, utilize the wavelength emission CPRI uplink optical signal of tunable optical module selection with this phase same rate.
In the present embodiment, the Wavelength selecting method of this tunable optical module comprises as shown in Figure 5:
Wherein, this Wavelength Assignment table record can be used for transmitting the uplink and downlink wavelength (comprising the first up wavelength and first downstream wavelength) of CPRI light signal, and the uplink and downlink wavelength of preserving be binding, one to one.In specific embodiment, the particular content of this Wavelength Assignment table can be determined when the network planning.
Concrete, this step 202 specifically can be by arranging the method realization of reverberation detection threshold in advance in described tunable optical module.This method comprises as shown in Figure 6:
Wherein, the above-mentioned reverberation detection threshold of mentioning can be determined by the following method:
Following elder generation is with reference to the luminous power of light signal of the reflected back of estimation in the table one:
Table one
| Loss budget (dB) | Remarks | |
| 10% partially reflecting mirror | 10 | Other direction decay to 0.5dB, very little to other terminal equipment influence that is linked into ODN |
| 1: 16 optical branching device (coming and going) | 28 | |
| Optical fiber comes and goes decay | 3 | Consider by coming and going 10km |
| Optical fiber splice (4) | 2 | Calculate by each joint 0.5dB |
| Amount to | 43dB |
As shown in Table 1, suppose that the transmitting power of the tunable optical module in the present embodiment is 3dBm, the luminous power of the reflected back that then receives is-40dBm.
(Avalanche Photodetector APD) realizes, makes it can detect light signal at input optical power during for-40dBm can to adopt the low-down snowslide diode of noiseproof feature in the present embodiment in the adjustable receiver.
The dropout of optical module inside (Loss Of Signal among concrete available Fig. 4 in above-mentioned steps 202, LOS) signal is as up detection information, can also use intensity instruction signal (the ReceivedSignal Strength Indicator of optical module inside, RSSI) or input (Signal Detect, SD) signal is realized same function.According to foregoing as can be known, establish the reverberation detection threshold and be-40dBm, certainly, difference along with applied environment, requirement to the detection threshold of LOS signal may be also different, and step 2022 can be that the LOS signal is example with up detection information so, further is specially:
If the uplink optical signal of the reflected back that the adjustable receiver of tunable optical module receives at this first up wavelength is less than-40dBm, then the LOS signal of TIA/LA output is high level, representative does not detect the uplink optical signal of reflected back, therefore this first up wavelength is not used by other RRU, be available, and execution in step 203; If the uplink optical signal of the reflected back that the adjustable receiver of tunable optical module receives at this first up wavelength is greater than described-40dBm, then the LOS signal of TIA/LA output is low level, representative detects the uplink optical signal of reflected back, therefore for fear of the wavelength conflict, RRU1 just is not suitable for re-using this first up wavelength in the present embodiment, and execution in step 204.
After the reception wavelength of tunable optical module is adjusted into the second up wavelength, begin with this second up wavelength, proceed to select the process of wavelength, until selected suitable wavelengths.Specifically proceed to select wavelength process can with the similar process of step 201 in the present embodiment to step 206.In brief, can regard this second up wavelength as first up wavelength, and repeat step 301 in the present embodiment to the process of step 306.
Concrete, the implementation of this step 205 can utilize the LOS signal as descending detection information, does not detect downlink optical signal to detect LOS signal representative indication.Its main process is:
When adjustable receiver when first downstream wavelength receives downlink optical signal, then the corresponding BBU1 of this first downstream wavelength that uses of explanation starts, also just being equivalent to this first uplink and downlink wavelength can use, that is: RRU1 can use this first downstream wavelength to receive the CPRI downlink optical signal.At this moment, the descending detection information that the wavelength control of tunable optical module partly gets access to shows as and detects downlink optical signal, and then execution in step 206; When adjustable receiver does not receive downlink optical signal on first downstream wavelength, then the corresponding BBU1 of this first downstream wavelength that uses of explanation does not start, it is unavailable also just to be equivalent to this first uplink and downlink wavelength, that is: RRU1 also cannot use this first downstream wavelength.At this moment, the descending detection information that the wavelength control of tunable optical module partly gets access to shows as and detects the LOS signal, and namely the LOS signal is high level, and then execution in step 204.
After the tunable optical module was finished the wavelength selection, RRU1 just can receive and recover the descending CPRI light signal of coming out, enter normal operating conditions.
In addition, RRU1 selects to select same wavelength to cause the situation of conflicting in up generation simultaneously thereby might exist with other a plurality of RRU in the process of wavelength.For example: if RRU2 and RRU1 start simultaneously, then might cause RRU2 and RRU1 to select its uplink CP RI light signal separately of the first upgoing wave longer transmission simultaneously.Therefore present embodiment also provides corresponding wavelength to select collision avoidance mechanism.Be example with BBU1 and RRU1 below, describe this wavelength and select collision avoidance mechanism.
Whether the receiver of BBU1 can increase to judge on the up wavelength whether clash suddenly by detecting the luminous power that receives, and portion produces the LOS signal within it, BBU jumps to synchronously and the rate consulation state according to this LOS signal, and according to adding far-end LOS indication in the CPRI downlink frame that is defined in transmission of CPRI agreement; RRU1 will receive the far-end LOS indication that this BBU1 sends in the CPRI downlink optical signal then, jump to synchronous and rate consulation state, RRU1 is up to stop to send light signal, namely closes (disable) tunable optical module and sends enable signal (" TX_EN " signal) function; The tunable optical module of RRU1 can be monitored " TX_EN " signal ((Laser DiodeDriver of laser driver as shown in Figure 4 of its inside, LDD) part, generally speaking, have only after the LDD of tunable optical module receives " TX_EN " signal of RRU1 transmission, could drive adjustable transmitter capable and send light signal, just can convert the data-signal that the LDD that receives sends to uplink optical signal sends), with this signal disable after a period of time at random, it selects function of wavelength to open (enable) again, again carry out the selection course of wavelength, namely carry out step 201 again to the process of step 206.
The technical scheme that the embodiment of the invention provides has following beneficial effect: can realize automatically being that RRU selects the wavelength that is fit to, and need not to change the CPRI agreement, can with the existing equipment compatibility; Need not to change existing BBU equipment and RRU equipment, be convenient to the enforcement of system upgrade and scheme easy to maintenance with universal; Because it is carrying out the tunable optical module of wavelength selection is the hot swappable device, therefore also less to the influence that system produces to the change of optical module; And because each the tunable optical module in the present embodiment can be supported the multi-wavelength, therefore can realize RRU, it is the uniform specification of RE, it is colourless to be that RE can realize, also can solve because the wavelength difference that the tunable optical module is supported, specification different and cause need therefore be convenient to the storage of O﹠M and the optical module of light source to the trouble of optical module coding.
Embodiment 3
Present embodiment specifically provides a kind of Wavelength selecting method, also can the RN at ODN before this method is implemented on the mounting portion speculum, in order to the uplink optical signal reflected back RE in the transmission course.Part system constructing schematic diagram behind the speculum of mounting portion also can be with reference to Fig. 3.Wherein embodiment 3 is than embodiment 1, and the selection wavelength method that main difference provides is deployed in the inner realization of RRU.The the transmitting and receiving wavelength and can regulate of adjustable transmitter capable in the tunable optical module in this enforcement and adjustable receiver, and RRU can arrange by the transmitting-receiving wavelength of wavelength setting (WL_SET) signal to the tunable optical module.
The workflow of BBU1 can be with reference to the workflow of BBU1 among the embodiment 2 in the present embodiment.
Introduce the workflow of the RRU1 of corresponding BBU1 in the present embodiment below:
At first, introduce the RRU1 and the hot swappable tunable optical module that provide in the present embodiment earlier, wherein its inner principle of RRU1 can be as shown in Figure 7.
RRU1 is introduced into holding state after starting, and enters synchronous regime then, and the transmitter of the tunable optical module of its connection starts not luminance.Adjustable receiver is attempted receiving the CPRI downlink optical signal with flank speed, if do not receive the CPRI downlink optical signal of phase same rate, then reselects another transmission rate, and up to minimum speed limit, the circulation that goes round and begins again is until the ingress rate synchronous regime; If in preset period of time T1 ', can receive the CPRI downlink optical signal of phase same rate, then determine and BBU1 ingress rate synchronous regime, utilize the wavelength emission CPRI uplink optical signal of tunable optical module selection with this phase same rate.
In the present embodiment, the Wavelength selecting method of this RRU1 terminal comprises as shown in Figure 8:
Step 301, the wavelength control of RRU1 part generate according to the Wavelength Assignment table and are used to indicate the tunable optical module to receive wavelength be first configuration signal of the first up wavelength, and send described first configuration signal to the tunable optical module.This tunable optical module is the described first up wavelength according to the indication of described first configuration signal with the reception wavelength configuration of its adjustable receiver.
Wherein, present embodiment medium wavelength allocation table also can be with reference to embodiment 2 medium wavelength allocation tables.
Step 302, the wavelength control of RRU1 are partly obtained up detection information, and this up detection information is used for being illustrated in the uplink optical signal that whether detects the partially reflecting mirror reflected back on the described first up wavelength.If the up detection information indication of obtaining does not detect the uplink optical signal of described reflected back, then execution in step 303; If the up detection information of obtaining indication detects the light signal of described reflected back, then represented this first up wavelength this moment and distributed and go out the wavelength conflict that produces for fear of reusing this first up wavelength, execution in step 304.
Concrete, this step 302 specifically can realize by the method that the reverberation detection threshold is set in described tunable optical module in advance.This method comprises as shown in Figure 9:
Wherein, definite method of the above-mentioned reverberation detection threshold of mentioning can be with reference to definite method of implementing in 2.
In like manner, be example with the LOS signal as up detection information specifically in the step 302 in the present embodiment, can establish the reverberation detection threshold equally is-40dBm that step 3022 can further be specially so:
If the uplink optical signal of the reflected back that the adjustable receiver of tunable optical module receives at this first up wavelength is less than-40dBm, then the LOS signal of TIA/LA output is high level, representative does not detect the uplink optical signal of reflected back, then the high level LOS signal of this output will be transferred to RRU1, after RRU1 receives this LOS signal, execution in step 203; If the uplink optical signal of the reflected back that the adjustable receiver of tunable optical module receives at this first up wavelength is greater than described-40dBm, then the LOS signal of TIA/LA output is low level, representative detects the uplink optical signal of reflected back, RRU1 obtains to learn that this first up wavelength is assigned with away behind this signal, for avoiding wavelength conflict execution in step 304.
After the reception wavelength of tunable optical module is adjusted into the second up wavelength, begin with this second up wavelength, proceed to select the process of wavelength, until selected suitable wavelengths.Specifically proceed to select wavelength process can with the similar process of step 301 in the present embodiment to step 306.In brief, can regard this second up wavelength as first up wavelength, and repeat step 301 in the present embodiment to the process of step 306.
Step 305, the wavelength control of RRU1 are partly obtained descending detection information, and whether this descending detection information indication detects downlink optical signal on described first downstream wavelength.If described descending detection information indication of obtaining detects downlink optical signal, then execution in step 306; If the descending detection information indication of obtaining does not detect downlink optical signal, then execution in step 304.
Concrete, this step 305 utilize the LOS signal as descending detection information, do not detect downlink optical signal and realize that namely the LOS signal is that the high level representative does not detect downlink optical signal to detect LOS signal representative indication.Its main process is:
When adjustable receiver when first downstream wavelength receives downlink optical signal, then the corresponding BBU1 of this first downstream wavelength that uses of explanation starts, also just being equivalent to this first uplink and downlink wavelength can use, that is: RRU1 can use this first downstream wavelength to receive the CPRI downlink optical signal.At this moment, the descending detection information from the tunable optical module that the wavelength control of RRU1 partly gets access to shows as and detects downlink optical signal, and then execution in step 306; When adjustable receiver does not receive downlink optical signal on first downstream wavelength, then the corresponding BBU1 of this first downstream wavelength that uses of explanation does not start, it is unavailable also just to be equivalent to this first uplink and downlink wavelength, that is: RRU1 also cannot use this first downstream wavelength.At this moment, the wavelength control of RRU1 the descending detection information from the tunable optical module of partly getting access to shows as and detects the LOS signal, and namely the LOS signal is high level, and then execution in step 304.
Step 306, it is the 4th configuration signal of the first up wavelength that RRU1 generates the emission wavelength that is used to indicate the tunable optical module according to described Wavelength Assignment table, and sends described the 4th configuration signal to the tunable optical module.Tunable optical module optical module is configured to the described first up wavelength according to the indication of described the 3rd smooth signalization with the emission wavelength of its adjustable transmitter capable.
RRU1 finishes and just can receive the descending CPRI light signal that recovery is come out after wavelength is selected, and enters normal operating conditions.
In addition, also can adopt embodiment 2 medium wavelengths to select collision avoidance mechanism in the present embodiment.This mechanism particular content also can be with reference to the description among the embodiment 2.Difference is, need carry out the selection course of wavelength again the time, is to carry out step 301 again to the process of step 306 when last in the present embodiment.
The method that the embodiment of the invention provides can realize automatically being that RRU selects the wavelength that is fit to, and need not to change the CPRI agreement, can with the existing equipment compatibility; Need not to change existing BBU equipment, can utilize tunable optical module of the prior art, also less to the change of RRU equipment, be convenient to the enforcement of system upgrade and scheme easy to maintenance with universal; And because each the tunable optical module in the present embodiment can be supported the multi-wavelength, therefore can realize RRU, it is the uniform specification of RE, it is colourless to be that RE can realize, also can solve because the wavelength difference that the tunable optical module is supported, specification different and cause need therefore be convenient to O﹠M and the storage of light source to the trouble of optical module coding.
Embodiment 4
Present embodiment provides a kind of optical module 400, so that in above-described embodiment 2, and the enforcement of the method for tunable optical module.As shown in figure 10, this tunable optical module comprises: Wavelength Assignment table 41, wavelength configuration module 42 and optical signal detecting module 43.
Wavelength Assignment table 41 is used for predetermined at least one pair of the first up wavelength and first downstream wavelength of binding mutually of record; Wavelength configuration module 42, the reception wavelength that is used for according to Wavelength Assignment table 41 configuration optical module 400 is the first up wavelength; Optical signal detecting module 43, be used for obtaining whether indication detects the uplink optical signal of partially reflecting mirror reflected back on the described first up wavelength up detection information, and obtain whether indication detects downlink optical signal on described first downstream wavelength descending detection information; Described wavelength configuration module 42 also is used for, when the up detection information indication that gets access to when described optical signal detecting module 43 did not detect the uplink optical signal of described reflected back, then the reception wavelength according to described Wavelength Assignment table 41 configuration optical module 400 be first downstream wavelength of correspondence; When the descending detection information indication that gets access to when described optical signal detecting module 43 detects downlink optical signal, be the described first up wavelength according to the emission wavelength of described Wavelength Assignment table 41 configuration optical module 400.
Wherein, above-mentioned wavelength configuration module 42 and optical signal detecting module 43 can belong to the wavelength control part of optical module 500.
Further, in the present embodiment, wavelength configuration module 42 also can be used for: when the up detection information that described optical signal detecting module 43 gets access to is indicated the light signal that detects described reflected back, or the described descending detection information indication that gets access to when optical signal detecting module 43 is not when detecting downlink optical signal, is the second up wavelength according to the reception wavelength of described Wavelength Assignment table 41 configuration optical module 400.
The optical module that provides in the present embodiment is owing to be the hot swappable device, so the change of optical module is also less to the influence that system produces; And because each the tunable optical module in the present embodiment can be supported the multi-wavelength, therefore can realize the uniform specification of RE; Simultaneously, when carrying out the realization of CPRI optical signal transmission by ODN, need not to change existing REC equipment and RE equipment, be convenient to system upgrade and maintenance.
Embodiment 5
Present embodiment provides a kind of RE, and this RE500 can be specially a kind of RRU, and this RE500 can be used for carrying out RRU1 role among the embodiment 3.As shown in figure 11, this RE500 comprises: Wavelength Assignment table 51, wavelength configuration module 52, optical signal detecting module 53.
Wavelength Assignment table 51 is used for predetermined at least one pair of the first up wavelength and first downstream wavelength of binding mutually of record; Wavelength configuration module 52, the reception wavelength that is used for according to Wavelength Assignment table 51 configuration optical module is the first up wavelength; Optical signal detecting module 53, be used for obtaining whether indication detects the uplink optical signal of partially reflecting mirror reflected back on the described first up wavelength up detection information, and obtain whether indication detects downlink optical signal on described first downstream wavelength descending detection information; Described wavelength configuration module 52 also is used for, when the up detection information indication that gets access to when described optical signal detecting module 53 did not detect the uplink optical signal of described reflected back, then the reception wavelength according to described Wavelength Assignment table 51 configuration optical module 5 be first downstream wavelength of correspondence; When the descending detection information indication that gets access to when described optical signal detecting module 53 detects downlink optical signal, be the described first up wavelength according to the emission wavelength of described Wavelength Assignment table 51 configuration optical module.
Wherein, wavelength configuration module 42 and optical signal detecting module 43 can belong to the wavelength control part of RE500.
Wavelength configuration module 52 also can be used in the present embodiment: when the up detection information that described optical signal detecting module 53 gets access to is indicated the light signal that detects described reflected back, or the described descending detection information indication that gets access to when optical signal detecting module 53 is not when detecting downlink optical signal, is the second up wavelength according to the reception wavelength of described Wavelength Assignment table 51 configuration optical module.
Especially, present embodiment medium wavelength configuration module 52 can also comprise:
Configuration signal generation unit 521 is used for generating the configuration signal that is used to indicate the transmitting-receiving wavelength according to Wavelength Assignment table 51; Transmitting element 522 be used for to send described configuration signal to optical module, so that described optical module arranges its transmitting-receiving wavelength according to the indication of described configuration signal.
RE that the embodiment of the invention provides realizes selecting automatically the function of the wavelength that is fit to, and need not to change the CPRI agreement, can with the existing equipment compatibility; During use, also need not to change existing REC equipment, and can be used with tunable optical module of the prior art, be convenient to system upgrade and maintenance, the enforcement that makes things convenient for scheme with popularize can realize colourless, solve because the wavelength difference that the tunable optical module is supported, specification different and cause need therefore be convenient to O﹠M and the storage of light source to the trouble of optical module coding.
Embodiment 6
Present embodiment provides a kind of system of selecting wavelength, as shown in figure 12, comprising: partially reflecting mirror 61, optical module 62.
Wherein, partially reflecting mirror 61 is used for uplink optical signal is reflexed to optical module 62; Optical module 62, be used for after being the first up wavelength according to Wavelength Assignment table configuration reception wavelength, obtain be used to the up detection information that is illustrated in the uplink optical signal that whether detects partially reflecting mirror 61 reflected backs on the described first up wavelength, if the up detection information indication of obtaining does not detect the uplink optical signal of described reflected back, then dispose the reception wavelength of described optical module according to described Wavelength Assignment table and be first downstream wavelength of correspondence; Obtain for the descending detection information that just on described first downstream wavelength, whether detects downlink optical signal, if described descending detection information indication of obtaining detects downlink optical signal, then the emission wavelength that disposes described optical module according to described Wavelength Assignment table is the described first up wavelength.
The technical scheme that provides system to pass through to increase partially reflecting mirror in the present embodiment in existing system has realized realizing the wavelength technique effect that selection is fit to by system is adopted less change.And need not to change existing REC equipment, need not to change existing REC equipment and RE equipment; In the time of on being deployed in module, therefore also less to the influence that system produces to the change of optical module owing to the optical module that carries out the wavelength selection is the hot swappable device, make things convenient for the enforcement of scheme with universal.
Embodiment 7
The system that present embodiment provides a kind of wavelength to select as shown in figure 13, comprising: partially reflecting mirror 71, optical module 72 and RE73.
Partially reflecting mirror 71 is used for uplink optical signal is reflexed to optical module 72.
Optical module 72, the uplink optical signal that whether receives reflected back 72 for basis is determined up detection information, and sends it to RE.
RE73, be used for generate according to the Wavelength Assignment table be used to indicate receive wavelength and be first configuration signal of the first up wavelength after, send described first configuration signal to optical module 72, and obtain described up detection information; If the up detection information of obtaining indication does not detect the uplink optical signal of described reflected back, then generate according to the Wavelength Assignment table and be used to indicate that to receive wavelength be second configuration signal of first downstream wavelength, and send described second configuration signal to optical module; Obtain descending detection information again, if described descending detection information indication of obtaining detects downlink optical signal, then configuration generates and is used to indicate the 3rd configuration signal that emission wavelength is the first up wavelength according to the Wavelength Assignment table, and sends described the 3rd configuration signal to optical module 72;
Correspondingly, optical module 72 also is used for according to the indication of described first, second and the 3rd configuration signal its transmitting-receiving wavelength being set, and determines descending detection information, the concurrent RE73 that sends them to according to whether detecting downlink optical signal in first downstream wavelength.
The technical scheme that provides system to pass through to increase partially reflecting mirror in the present embodiment in existing system has realized realizing the wavelength technique effect that selection is fit to by system is adopted less change.And need not to change existing REC equipment, and also less to the change of RE equipment, be convenient to RE upgrading and maintenance; And this programme need not to change the CPRI agreement, can with the existing equipment compatibility.
The embodiment of the invention mainly applies in the light integration field, might be applied to other scene of this area along with development of internet technology.For example: (Point-to-Multi-Point, P2MP) framework as WDM PON etc., go on the similar or close technical field of perhaps migrating but go for point-to-multipoint based on WDM and conditioning technology; Particularly in the communication system that contains the multiplexing application scenarios of multichannel, for example: can also be used for OFDM (optical frequency division multiplex, Optical Frequency Division Multiplexing)-PON, OCDM (Optical Code Division Multiplexing, Optical Code Division Multiplexing)-PON, PDM (palarization multiplexing, Polarization Division Multiplexing)-PON in the OFDM passage, the OCDM passage, the distribution of OPDM passage, but be not limited to these systems, can also be other network systems, comprise: Long Term Evolution (LongTerm Evolution, LTE), WIMAX (Worldwide Interoperability for Microwave Access, World Interoperability for Microwave Access, WiMax) system, global system for mobile communications (Global System for MobileCommunications, GSM), Wideband Code Division Multiple Access (WCDMA) (Wideband-Code Division MultipleAccess, WCDMA), TD SDMA inserts (Time Division-Synchronized CodeDivision Multiple Access, TD-SCDMA), code division multiple access (Code-Division MultipleAccess, CDMA), WLAN (wireless local area network) (Wireless Local Area Network, or fixed network etc. WLAN).
Through the above description of the embodiments, the those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium that can read, floppy disk as computer, hard disk or CD etc., comprise that some instructions are with so that an equipment (can be optical module, also can be RE etc.) is carried out the described method of each embodiment of the present invention.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by described protection range with claim.
Claims (11)
1. a Wavelength selecting method is characterized in that, comprising:
Reception wavelength according to Wavelength Assignment table configuration optical module is the first up wavelength;
Obtain the up detection information that is used to indicate the uplink optical signal that on the described first up wavelength, whether detects the partially reflecting mirror reflected back that is arranged on Optical Distribution Network;
If the up detection information of obtaining indication does not detect the uplink optical signal of described reflected back, be first downstream wavelength of correspondence according to described Wavelength Assignment table with the reception wavelength configuration of described optical module then;
Obtain the descending detection information that on described first downstream wavelength, whether detects downlink optical signal that is used to indicate;
If described descending detection information indication of obtaining detects downlink optical signal, then according to described Wavelength Assignment table the emission wavelength of described optical module is configured to the described first up wavelength.
2. method according to claim 1 is characterized in that, this method also comprises:
If the up detection information of obtaining indication detects the light signal of described reflected back, or the descending detection information indication of obtaining do not detect downlink optical signal, and then the reception wavelength according to described Wavelength Assignment table configuration optical module is the second up wavelength.
3. method according to claim 1 is characterized in that, described optical module is provided with the reverberation detection threshold; Describedly obtain whether indication detect the uplink optical signal of partially reflecting mirror reflected back on the described first up wavelength up detection information and comprise:
The uplink optical signal of optical module receiving unit mirror reflects on the described first up wavelength;
If the uplink optical signal of the reflected back that optical module receives less than described reverberation detection threshold, then makes described up detection information indication not detect the uplink optical signal of reflected back;
If the uplink optical signal of the reflected back that optical module receives greater than described reverberation detection threshold, then makes described up detection information indication detect the uplink optical signal of reflected back.
4. according to any described method in the claim 1 to 3, it is characterized in that described reception wavelength according to Wavelength Assignment table configuration optical module is that the first up wavelength comprises:
Generate according to the Wavelength Assignment table and to be used to indicate that to receive wavelength be first configuration signal of the first up wavelength;
Send described first configuration signal to optical module, so that described optical module is the described first up wavelength according to the indication of described first configuration signal with the reception wavelength configuration of its adjustable receiver.
5. method according to claim 4 is characterized in that, the described reception wavelength that disposes described optical module according to described Wavelength Assignment table also comprises for the first corresponding downstream wavelength:
Generate according to the Wavelength Assignment table and to be used to indicate that to receive wavelength be second configuration signal of first downstream wavelength;
Send described second configuration signal to optical module, so that described optical module is described first downstream wavelength according to the indication of described second configuration signal with the reception wavelength configuration of its adjustable receiver.
6. method according to claim 5 is characterized in that, the described emission wavelength that disposes described optical module according to described Wavelength Assignment table is that the described first up wavelength also comprises:
Generation is used to indicate the 3rd configuration signal that emission wavelength is the first up wavelength according to the Wavelength Assignment table;
Send described the 3rd configuration signal to optical module, so that described optical module is configured to the described first up wavelength according to the indication of described the 3rd configuration signal with the emission wavelength of its adjustable transmitter capable.
7. a wavelength selection system is characterized in that, comprising:
The Wavelength Assignment table is used for predetermined at least one pair of the first up wavelength and first downstream wavelength of binding mutually of record;
The wavelength configuration module, the reception wavelength that is used for according to Wavelength Assignment table configuration optical module is the first up wavelength;
The optical signal detecting module, be used for obtaining whether indication detects the uplink optical signal of the partially reflecting mirror reflected back that is arranged on Optical Distribution Network on the described first up wavelength up detection information, and obtain whether indication detects downlink optical signal on described first downstream wavelength descending detection information;
Wherein, described wavelength configuration module also is used for, when the up detection information indication that gets access to when described optical signal detecting module did not detect the uplink optical signal of described reflected back, then the reception wavelength that disposes described optical module according to described Wavelength Assignment table was the first corresponding downstream wavelength; When the descending detection information indication that gets access to when described optical signal detecting module detected downlink optical signal, the emission wavelength that disposes described optical module according to described Wavelength Assignment table was the described first up wavelength.
8. device according to claim 7 is characterized in that, described wavelength configuration module also is used for:
When the up detection information that described optical signal detecting module gets access to is indicated the light signal that detects described reflected back, or the described descending detection information indication that gets access to when the optical signal detecting module is not when detecting downlink optical signal, is the second up wavelength according to the reception wavelength of described Wavelength Assignment table configuration optical module.
9. according to claim 7 or 8 described devices, it is characterized in that described wavelength configuration module comprises:
The configuration signal generation unit is used for generating the configuration signal that is used to indicate the transmitting-receiving wavelength according to the Wavelength Assignment table;
Transmitting element is used for sending described configuration signal to optical module, so that described optical module disposes its transmitting-receiving wavelength according to the indication of described configuration signal.
10. a wavelength selective system is characterized in that, comprising:
Partially reflecting mirror, it is arranged on the remote node of Optical Distribution Network, is used for uplink optical signal is reflexed to optical module;
Optical module, be used for after according to the Wavelength Assignment table its reception wavelength configuration being the first up wavelength, obtain the up detection information that is used to indicate the uplink optical signal that on the described first up wavelength, whether detects the partially reflecting mirror reflected back, if the up detection information of obtaining indication does not detect the uplink optical signal of described reflected back, be first downstream wavelength of correspondence according to described Wavelength Assignment table with the reception wavelength configuration of described optical module then; Obtain the descending detection information that on described first downstream wavelength, whether detects downlink optical signal that is used to indicate, if described descending detection information indication of obtaining detects downlink optical signal, then according to described Wavelength Assignment table the emission wavelength of described optical module is configured to the described first up wavelength.
11. the system that wavelength is selected is characterized in that, comprising:
Partially reflecting mirror, it is arranged on the remote node of Optical Distribution Network, is used for uplink optical signal is reflexed to optical module;
Optical module, the uplink optical signal that whether receives reflected back for basis is determined up detection information, and sends it to access device;
Access device, be used for generate according to the Wavelength Assignment table be used to indicate receive wavelength and be first configuration signal of the first up wavelength after, send described first configuration signal to optical module, and obtain described up detection information; If the up detection information of obtaining indication does not detect the uplink optical signal of described reflected back, then generate according to the Wavelength Assignment table and be used to indicate that to receive wavelength be second configuration signal of first downstream wavelength, and send described second configuration signal to optical module; And obtain descending detection information, if described descending detection information indication of obtaining detects downlink optical signal, then generate according to the Wavelength Assignment table and be used to indicate the 3rd configuration signal that emission wavelength is the first up wavelength, and send described the 3rd configuration signal to optical module;
Described optical module also is used for disposing its transmitting-receiving wavelength according to the indication of described first, second and the 3rd configuration signal, and determines descending detection information according to whether detecting downlink optical signal in first downstream wavelength, concurrently sends them to described access device.
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| EP3457595A1 (en) * | 2014-04-29 | 2019-03-20 | Huawei Technologies Co., Ltd. | Wireless communications system and wireless radio frequency apparatus |
| WO2016070353A1 (en) | 2014-11-05 | 2016-05-12 | 华为技术有限公司 | Optical port auto-negotiation method, optical module, office side device, and terminal device |
| CN106302291A (en) * | 2016-08-15 | 2017-01-04 | 上海交通大学 | The forward pass optical-fiber network downlink transmission system of orthogonal frequency division multiplexi based on filtering |
| CN110391848B (en) * | 2018-04-18 | 2024-03-22 | 中兴通讯股份有限公司 | AMCC device and transmission wavelength regulation and control method |
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| CN101222279A (en) * | 2007-01-09 | 2008-07-16 | 日立通讯技术株式会社 | Passive optical network system and wavelength assignment method |
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| CN101222279A (en) * | 2007-01-09 | 2008-07-16 | 日立通讯技术株式会社 | Passive optical network system and wavelength assignment method |
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