CN101753244B - Method and system for transporting service in RRU loop network - Google Patents
Method and system for transporting service in RRU loop network Download PDFInfo
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- CN101753244B CN101753244B CN2008102392505A CN200810239250A CN101753244B CN 101753244 B CN101753244 B CN 101753244B CN 2008102392505 A CN2008102392505 A CN 2008102392505A CN 200810239250 A CN200810239250 A CN 200810239250A CN 101753244 B CN101753244 B CN 101753244B
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Abstract
The invention discloses a method and a system for transporting service in an RRU loop network. The system is used to ensure that the service drops no words and to improve the quality of the service. The method for transporting service in the RRU loop network is that a base station BBU and an RRU adopts a first service channel connected with the BBU from the first optical interface of the BBU to transport the service; and when faults occur in the first service channel, the BBU and the RRU utilizes the configuration parameters of the first service channel to switch the present proceeding service from the first service channel to a second service channel connected with the BBU from the second optical interface of the BBU to continuously transport the service.
Description
Technical field
The present invention relates to communication technical field, relate in particular to business transmitting method and system in a kind of far-end RF module (RRU, Remote Radio Unit) annular networking.
Background technology
In the TD-SCDMA baseband extension system, use optical fiber to be connected between base station (BBU) and the RRU usually.As shown in Figure 1, in the certain applications scene, can use the mode of RRU series connection that multistage RRU is connected with BBU, realize the service channel of series connection, if the optical fiber that therefore is used for multistage RRU is together in series breaks down for a certain reason, then must cause part RRU to communicate by letter with BBU.
For addressing the above problem, the concept of RRU annular networking has been proposed in Ir interface (interface between BBU and the RRU) technology, be that each RRU can both insert BBU from the service channel of two different directions, after the service channel of one of them direction broke down, the service channel that can switch to the another one direction continued to keep communicating by letter with BBU.Referring to Fig. 2, current multistage RRU passes through to insert the service channel realization of BBU and communicating by letter of BBU from light mouth 1 by series system.Referring to Fig. 3, after the optical fiber between RRU1 and the light mouth 1 breaks down, switch to from the service channel of light mouth 2 access BBU and continue communicating by letter of maintenance and BBU, thereby realized the backup of service channel.
Professional transfer process under the RRU annular networking of stipulating in the existing Ir interfacing as shown in Figure 4, from the flow process shown in this figure as can be seen, existing from detecting the service channel fault, the service channel to RRU from the another one direction inserts BBU again and recovers the professional needed time and mainly be made up of following four parts:
1) every 3s sends a heartbeat message, and the continuous fault detection mechanism of not receiving that heartbeat message thinks that then RRU is not in place 3 times has determined to break down to from optical fiber and found that the fault required time is 6～9 seconds (s).
2) after RRU detected fiber failure, the mode by warm reset or hard reset emptied self configuration, and warm reset mode required time is about 5s, and hard reset mode required time then is a minute level.
3) RRU need switch to an other service channel from the fault service channel with clock, and be about 1～2s required switching time.
4) RRU initiates to insert request from an other service channel again, carries out the operations such as configuration, latency measurement, parameter configuration and cell configuration of this service channel then, and required time is about 5s～10s.
This shows, above-mentioned four needed times are added up, the needed whole time is about 25s under the warm reset mode, the needed whole time was greater than 1 minute under the hard reset mode, that is to say, no matter be to adopt which kind of mode, common RRU annular networking technology to adopting another service channel to recover the patient time that the professional needed time all can't satisfy professional call drop again, therefore can cause professional call drop from professional channel failure.
In sum, prior art is under RRU annular networking situation, after the current service channel that is using breaks down, after RRU need restart, again insert BBU from the another one service channel, and reconfiguring relevant parameter, the needed time of whole process has surpassed the patient time of professional call drop, thereby causes professional call drop.
Summary of the invention
The embodiment of the invention provides business transmitting method and the system in a kind of RRU annular networking, in order to the call drop not of assurance business under RRU annular networking situation, improves quality of service.
Business transmitting method under a kind of RRU annular networking that the embodiment of the invention provides comprises:
BBU of base station and RRU adopt the first service channel transport service that inserts this BBU from the first light mouth of this BBU;
When definite described first service channel breaks down, described BBU and described RRU utilize the configuration parameter of described first service channel, and current ongoing business is switched to second service channel continuation transmission that inserts this BBU from the second light mouth of described BBU from described first service channel.
A kind of communication system that the embodiment of the invention provides comprises: BBU of base station and a plurality of far-end RF module RRU, and wherein said BBU links to each other by annular networking with described a plurality of RRU;
Described RRU is used for adopting the first service channel transport service that inserts this BBU from the first light mouth of described BBU; When definite this RRU can't insert this BBU from described first service channel, utilize the configuration parameter of described first service channel, current ongoing business is switched to second service channel continuation transmission that inserts this BBU from the second light mouth of described BBU from described first service channel;
Described BBU is for first service channel and this RRU transport service that adopt each RRU; When definite RRU can't insert this BBU from its first service channel, utilize the configuration parameter of first service channel of this RRU, current ongoing business is continued transmission from second service channel that this first service channel switches to this RRU, and first service channel and second service channel of described RRU dispose same set of configuration parameter.
In the embodiment of the invention, BBU of base station and RRU adopt the first service channel transport service that inserts this BBU from the first light mouth of this BBU; When definite described first service channel breaks down, described BBU and described RRU utilize the configuration parameter of described first service channel, current ongoing business is switched to second service channel continuation transmission that inserts this BBU from the second light mouth of described BBU from described first service channel, make RRU can be rapidly switch to the another one service channel from the service channel of fault, continue to communicate by letter with the BBU maintenance, thus assurance business call drop not.
Description of drawings
Fig. 1 is RRU networking schematic diagram connected in series in the prior art;
Fig. 2 is the schematic diagram that the RRU annular inserts BBU in the prior art;
Fig. 3 is the schematic diagram that the RRU annular after service channel breaks down in the prior art inserts BBU;
Fig. 4 is the professional transfer process schematic diagram of RRU annular networking in the prior art;
The overall procedure schematic diagram of the business transmitting method in a kind of RRU annular networking that Fig. 5 provides for the embodiment of the invention;
Under the RRU annular networking situation that Fig. 6 provides for the embodiment of the invention, RRU serial from different directions inserts the schematic diagram of BBU;
Service channel schematic diagram before service channel switches in the RRU annular networking that Fig. 7 provides for the embodiment of the invention;
Service channel schematic diagram after service channel switches in the RRU annular networking that Fig. 8 provides for the embodiment of the invention;
The idiographic flow schematic diagram of the business transmitting method in a kind of RRU annular networking that Fig. 9 provides for the embodiment of the invention;
The structural representation of a kind of communication system that Figure 10 provides for the embodiment of the invention.
Embodiment
The embodiment of the invention provides business transmitting method and the system in a kind of RRU annular networking, in order to the call drop not of assurance business under RRU annular networking situation, improves quality of service.
In the prior art, when RRU never shares the same light mouth access BBU, all need to obtain again again a cover from the relevant configuration parameter of service channel of new light mouth access BBU, comprise RRU identifier (being the IP address of RRU), antenna configuration parameters, IQ data channel configuration parameter and cell configuration parameter etc.Equally, for BBU, after RRU inserts from new light mouth, need redistribute a cover configuration parameter for this RRU, since consuming time long, professional call drop caused.The embodiment of the invention considers for same RRU, no matter adopts which service channel which light mouth to insert BBU from, and BBU can both use same IP address this RRU of unique identification, and disposes same set of parameter (except the propagation delay time value) for it.When the current business passage breaks down, RRU adopts from the service channel of another light mouth access BBU and inserts the process of BBU, can omit the allocation step of configuration parameter, only needing to adopt the propagation delay time value to carry out simple delay compensation gets final product, thereby reach the quick switching of service channel, the business that makes is kept.
In the embodiment of the invention, for each RRU in the annular networking sets up two designated lanes, be respectively first designated lane corresponding with the first light mouth of BBU in advance, and second designated lane corresponding with the second light mouth of BBU.And, BBU measures the propagation delay time value of first service channel and second service channel of each RRU in advance, dispose in the process of first service channel for this RRU at first designated lane of BBU by each RRU, first service channel of this RRU and the propagation delay time value of second service channel are notified to this RRU, and will be notified to this RRU for the configuration parameter that this first designated lane distributes.
Except the propagation delay time value, first service channel and second service channel of each RRU use same set of configuration parameter, make when RRU switches to another service channel from a service channel, can directly adopt the service channel of configuration parameter after switching of the service channel before switching to realize professional continuing.
Wherein, the same set of configuration parameter that first service channel of each RRU of the embodiment of the invention and second service channel adopt comprises at least: the identifier of RRU (IP address), IQ (real part imaginary part) data channel (being carrier wave antenna data passage) configuration parameter, antenna configuration parameters, passage configuration parameter and cell configuration parameter etc.But, do not comprise the propagation delay time value of service channel separately in this same set of configuration parameter, namely the propagation delay time value of first service channel of each RRU and second service channel is different.
Below in conjunction with accompanying drawing the technical scheme that the embodiment of the invention provides is described.
Referring to Fig. 5, the business transmitting method in a kind of RRU annular networking that the embodiment of the invention provides totally comprises step:
S501, BBU and RRU adopt the first service channel transport service that inserts this BBU from the first light mouth of this BBU.
S502, when definite this first service channel breaks down, BBU and RRU utilize the configuration parameter of first service channel, and current ongoing business is switched to second service channel continuation transmission that inserts this BBU from the second light mouth of BBU from first service channel.
Provide concrete explaining below.
Referring to Fig. 6, after BBU starts, disconnect light mouth 1 and light mouth 2 respectively, allow all RRU in the annular networking insert BBU from separately different business passage string shape respectively, thereby whether each service channel of verifying each RRU is normal, and the propagation delay time value of BBU when recording each RRU and inserting BBU respectively from the different business passage.
After two service channels confirming RRU are all normal, freely select service channel to insert BBU by each RRU, namely dynamically determine the service channel of the current employing of each RRU, all RRU might be the service channels that all adopts from light mouth 1 or light mouth 2 access BBU, RRU1 as shown in Figure 2, RRU2, RRU3, RRU4, RRU5 and RRU6 adopt the service channel that inserts BBU from light mouth 1, and perhaps RRU1 as shown in Figure 3, RRU2, RRU3, RRU4, RRU5 and RRU6 adopt the service channel that inserts BBU from light mouth 2; Perhaps, part RRU adopts the service channel that inserts BBU from light mouth 1, and part RRU adopts the service channel that inserts BBU from light mouth 2, as shown in Figure 6, RRU1, RRU2 and RRU3 adopt the service channel that inserts BBU from light mouth 1, and RRU4, RRU5 and RRU6 adopt the service channel that inserts BBU from light mouth 2.
Need to prove the arrow shown in Fig. 6,7,8 is that sign inserts BBU from which light mouth, and does not represent the transmission direction of data to that is to say that the transfer of data of service channel is twocouese, rather than unidirectional.
No matter which service channel RRU adopts which light mouth to insert BBU from, the BBU side all disposes the corresponding propagation delay time value of two service channels of each RRU to this RRU, it is the propagation delay time value that stores in advance among each RRU when self adopting each service channel transport service, thereby when the service switchover passage, need not to measure again the propagation delay time value of the service channel correspondence that switches to, saved the needed time of service switchover passage.
And, BBU also sets up dedicated link good and that RRU signal post needs at two light mouths respectively in advance, for heartbeat detection is continued, and follow-up other and this of can sending switch irrelevant configuration parameter, so want the pre-configured dedicated link corresponding with the service channel that switches to.And, for each RRU, BBU uses same set of IQ configuration data and identical RRU identifier at two light mouths, after guaranteeing that RRU adopts another service channel to insert BBU from another one light mouth, BBU can identify this RRU fast, realize the quick switching of BBU side, thereby further saved the needed time of service switchover passage.
Referring to Fig. 7, suppose the business of all having set up on each RRU, RRU1, RRU2 and RRU3 adopt the service channel that inserts BBU from light mouth 1, RRU4, RRU5 and RRU6 adopt the service channel that inserts BBU from light mouth 2, service channel between RRU1 and the RRU2 breaks down at this moment, causes the business transmission of RRU2 and RRU3 to be affected.
Contain the SERDES chip among each RRU, i.e. parallel series and staticizer have the function of detection fiber Link State, step-out when the optical fiber link fault, and produce alarm signal; When optical fiber link just often synchronous.
Among this moment RRU1 and the RRU2 because SERDES chip step-out, fast detecting is broken down to the service channel between current RRU1 and the RRU2, and with the alarm mode notify the (FPGA of field programmable gate array separately, field programmable gate array), by FPGA physical layer control word optical fiber alarm code (the Ir interfacing requires [1] 7.4) is set, it is set to Transmission Fibers chain circuit alarming in the up link FPGA among the RRU1, in order to the service channel of notifying RRU1 and BBU to break down; It is set to Transmission Fibers chain circuit alarming in the down link FPGA among the RRU2, in order to the service channel of notifying affected RRU2 and RRU3 to break down.After BBU received alarm, BBU goes to enable RRU2 and RRU3 disposes at the IQ of light mouth 1, enabled RRU2 and RRU3 in the IQ of light mouth 2 configuration; When the RRU2 processor is received FPGA alarm word among the RRU2, and after the FPGA among the RRU3 received the FPGA alarm word among the RRU2 and report the RRU3 processor, each adaptive switched clock at the corresponding levels of RRU2 and RRU3 was to standby service channel.
Above-mentioned RRU occurs unusual transmission of messages by bottom physics control word with the service channel of self current employing and gives other affected RRU, the used time is no more than 10ms, processor among the RRU receives that finishing clock after the alarm switches the used time and be no more than 1s, so RRU switches required time and is no more than 2s to finishing clock unusually from knowing service channel.
5) behind the switching clock, RRU2 and RRU3 adopt standby service channel to insert BBU from light mouth 2, so the script between RRU3 and the RRU4 does not have the service channel of transfer of data to be activated, RRU2 and RRU3 are inserted from the light mouth 2 of BBU, at this moment, the standby service channel reality of all RRU all lost efficacy, as shown in Figure 8, RRU2 and RRU3 pass through RRU4, RRU5 and RRU6 respectively from the light mouth 2 access BBU of BBU, and RRU1 continues the 1 access BBU from original service channel from the light mouth.
Need carry out the RRU (as above-mentioned RRU2 and RRU3) that service channel switches, do not need to upgrade any parameter of self, directly use the parameter before switching to get final product, IP address, antenna configuration parameters, IQ data channel configuration parameter and the cell configuration parameter etc. that comprise passage configuration parameter, RRU, that is to say, after RRU switches to another one service channel access BBU, do not need to stress newly to obtain above parameter from BBU again, thereby the fastext passage of realizing the RRU side switches.
After RRU switches to standby service channel from the fault service channel, RRU uses the propagation delay time value of the standby service channel of preserving in advance to carry out delay compensation immediately, because essential informations such as IP address do not change, original business datum still can remain valid and send to RRU, namely satisfy the requirement of service communication, make professional the continuation.
Therefore, in the service channel switching flow that the embodiment of the invention provides, all message all meet existing Ir interfacing requirement, and RRU hardware, software are not proposed new modification demand, are easy to realize.
Referring to Fig. 9, the business transmitting method under the RRU annular networking that the embodiment of the invention provides specifically comprises:
Step 1, RRU broadcasting insert BBU.
So-called key light mouth is exactly the light mouth that the current service channel that will adopt inserts BBU, and being equipped with the light mouth is exactly the light mouth that standby service channel inserts BBU.
Step 3, BBU are parameters such as each RRU distributing IP address, set up current service channel from key light mouth access BBU, and open heartbeat detection.
The propagation delay time value that step 4, BBU will record in advance for the different business passage of each RRU is notified to corresponding RRU.
Step 5, BBU are each RRU configuration parameter, comprise parameters such as antenna configuration and the configuration of IQ data channel.
Step 6, BBU carry out cell configuration, and business begins transmission.
Step 7, RRU and BBU learn that fast the current business passage breaks down.
The IQ configuration (identical with the IQ configuration of key light mouth) that is equipped with the light mouth is adopted in the IQ loss of configuration of the corresponding key light mouth of RRU that step 8, BBU control can't be communicated by letter with this BBU, namely cooperates this RRU that business is switched to another service channel and continues transmission.Meanwhile, execution in step 9.
Step 9, the RRU that can't communicate by letter with BBU switch to another service channel with clock from the service channel of fault.
Thereby make the current business of carrying out call drop can not occur, continued.
This shows, the technical scheme that provides by the embodiment of the invention, breaking down to finish from service channel switches to business on the another one service channel, and whole process required time mainly comprises following three parts:
1) can't with RRU that BBU communicates by letter in FPAG detect current service channel and break down, and time of notice BBU and affected RRU, usually＜2s, note is made Tc.
2) RRU switches to time of an other standby service channel with clock from the fault service channel, and about 1～2s, note is made Ts.
3) delay compensation of RRU, usually＜50ms, note is made Tm.
Therefore, total time is T=Tc+Ts+Tm＜4s, namely less than the time of judging professional call drop, thereby satisfies the professional not requirement of call drop.
Introduce the system that the embodiment of the invention provides below.
Referring to Figure 10, a kind of communication system that the embodiment of the invention provides comprises: BBU 11 and a plurality of RRU10, wherein said BBU 11 and described a plurality of RRU 10 link to each other by annular networking.
Preferably, described RRU 10 comprises:
Whether fault detection unit 103 breaks down for detection of first service channel of described RRU 10, when definite this first service channel breaks down, triggers switch unit 104.
Preferably, described memory cell 101 stored configuration parameters comprise at least:
The identifier of RRU 10, IQ data channel configuration parameter, antenna configuration parameters, passage configuration parameter and cell configuration parameter.
Preferably, described BBU 11 comprises:
Fault determining unit 113 is used for when first service channel of determining RRU 10 breaks down, and triggers control switch unit 114;
Described switch unit 104, receive the triggering of described fault detect Unit 103 after, clock is switched to its second service channel from first service channel of described RRU 10, and utilizes in advance the propagation delay time value of this second service channel of storage to carry out delay compensation; Utilize identifier, IQ data channel configuration parameter, antenna configuration parameters, passage configuration parameter and the cell configuration parameter of RRU 10, current ongoing business is switched to this second service channel from this first service channel continue transmission.
Preferably, described fault detection unit 103 comprises:
Detecting unit 1031 is used for determining that first service channel of RRU 10 breaks down, and being notified to notification unit 1032 when the parallel series of finding RRU 10 and staticizer step-out.
Preferably, described pretreatment unit 111 is further used for setting up first dedicated link for each RRU 10 at the first light mouth in advance, sets up second dedicated link at the second light mouth.
In sum, the embodiment of the invention is under the prerequisite of not violating existing Ir interfacing requirement, proposed a kind of RRU and can be have rapidly switched on the another one service channel from the service channel of fault, and continuation and BBU keep the technical scheme of communicating by letter, thereby guaranteed not call drop of business.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (11)
1. the business transmitting method in the far-end RF module RRU annular networking is characterized in that this method comprises:
BBU of base station and described RRU adopt the first service channel transport service that inserts this BBU from the first light mouth of this BBU;
When definite described first service channel breaks down, described RRU utilizes the configuration parameter of described first service channel, and the propagation delay time value of described second service channel of storing in advance, current ongoing business and clock are switched to second service channel continuation transmission that inserts this BBU from the second light mouth of described BBU from described first service channel, and first service channel and second service channel of described RRU dispose same set of configuration parameter except propagation delay time.
2. method according to claim 1 is characterized in that, described configuration parameter comprises at least:
The identifier of described RRU, IQ data channel configuration parameter, antenna configuration parameters, passage configuration parameter and cell configuration parameter.
3. method according to claim 2 is characterized in that, current ongoing business and clock are comprised from the step that described first service channel switches to described second service channel continuation transmission:
The IQ data channel configuration parameter corresponding with described RRU that described BBU controls the described first light mouth lost efficacy, and enabled the same IQ data channel configuration parameter corresponding with described RRU of the described second light mouth;
Described RRU switches to described second service channel with clock from described first service channel, and utilizes the propagation delay time value of described second service channel of storing in advance to carry out delay compensation;
Described RRU utilizes the identifier of self, described IQ data channel configuration parameter, antenna configuration parameters, passage configuration parameter and cell configuration parameter, current ongoing business is switched to described second service channel from described first service channel continue transmission.
4. according to claim 1,2 or 3 described methods, it is characterized in that described RRU comprises: parallel series and staticizer, on-site programmable gate array FPGA and processor;
Determine that the step that described first service channel breaks down comprises:
By parallel series and staticizer step-out, first service channel that detects described RRU breaks down, and notifies described FPGA;
The RRU that the information that described FPGA breaks down this first service channel by warning information is notified to described processor, described BBU and passes through this first service channel and described BBU service data transmission;
Described BBU determines that according to the notice of this RRU first service channel of this RRU breaks down.
5. method according to claim 1 is characterized in that, this method also comprises:
Described BBU sets up first dedicated link for described RRU at the described first light mouth in advance, sets up second dedicated link at the second light mouth.
6. a communication system is characterized in that, this system comprises: BBU of base station and a plurality of far-end RF module RRU, and wherein said BBU links to each other by annular networking with described a plurality of RRU;
Described RRU is used for adopting the first service channel transport service that inserts this BBU from the first light mouth of described BBU; When definite described first service channel breaks down, utilize the configuration parameter of described first service channel, and the propagation delay time value of described second service channel of storing in advance, current ongoing business and clock are switched to second service channel continuation transmission that inserts this BBU from the second light mouth of described BBU from described first service channel;
Described BBU is for first service channel and this RRU transport service that adopt each RRU; When definite described first service channel breaks down, utilize the configuration parameter of first service channel of this RRU, and the propagation delay time value of described second service channel of storing in advance, current ongoing business and clock are switched to second service channel continuation transmission that inserts this BBU from the second light mouth of described BBU from described first service channel.
7. system according to claim 6 is characterized in that, described RRU comprises:
Memory cell is used for the described BBU of storage and is first service channel of this RRU distribution and the propagation delay time value of second service channel in advance, and described BBU is the same set of configuration parameter that described first service channel and second service channel distribute;
Transmission unit is used for adopting the first service channel transport service that inserts this BBU from the first light mouth of described BBU;
Whether fault detection unit breaks down for detection of described first service channel, when definite this RRU can't insert described BBU from described first service channel, triggers switch unit;
Switch unit, after being used for receiving the triggering of described fault detection unit, utilize the propagation delay time value of described second service channel of storage in advance, and the configuration parameter of described first service channel switches to second service channel continuation transmission that inserts this BBU from the second light mouth of described BBU with current ongoing business from described first service channel.
8. system according to claim 6 is characterized in that, the configuration parameter of described cell stores comprises at least:
The identifier of described RRU, IQ data channel configuration parameter, antenna configuration parameters, passage configuration parameter and cell configuration parameter.
9. system according to claim 8 is characterized in that, described BBU comprises:
Pretreatment unit, be used for detecting in advance the propagation delay time value of first service channel and second service channel of each RRU, disposing for each RRU in the process of first service channel, with the propagation delay time value of first service channel and second service channel of this RRU, and the configuration parameter of this first service channel is notified to this RRU;
Transmission unit is for first service channel and this RRU transport service that adopt each RRU;
The fault determining unit is used for when definite RRU can't insert this BBU from its first service channel, triggers the control switch unit;
The control switch unit, be used for after the triggering that receives described fault determining unit, the IQ data channel configuration parameter corresponding with this RRU of controlling the first light mouth lost efficacy, and enable the same IQ data channel configuration parameter corresponding with this RRU of the second light mouth, realize adopting second service channel of this RRU of this second light mouth correspondence as the current service channel that carries out professional transmission with this RRU;
Described switch unit, receive the triggering of described fault detection unit after, clock is switched to described second service channel from described first service channel, and utilizes in advance the propagation delay time value of described second service channel of storage to carry out delay compensation; Utilize the identifier of described RRU, described IQ data channel configuration parameter, antenna configuration parameters, passage configuration parameter and cell configuration parameter, current ongoing business is switched to described second service channel from described first service channel continue transmission.
10. system according to claim 9 is characterized in that, described fault detection unit comprises:
Detecting unit is used for determining that first service channel of described RRU breaks down, and being notified to notification unit when the parallel series of finding described RRU and staticizer step-out;
Notification unit is used for the RRU that is notified to described switch unit, described BBU and passes through this first service channel and described BBU service data transmission by the information that warning information breaks down this first service channel.
11. system according to claim 9 is characterized in that, described pretreatment unit is further used for setting up first dedicated link for each RRU at the first light mouth in advance, sets up second dedicated link at the second light mouth.
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