CN101771591A - Service transmission method and system under RRU and BBU loop network - Google Patents
Service transmission method and system under RRU and BBU loop network Download PDFInfo
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- CN101771591A CN101771591A CN200810241187A CN200810241187A CN101771591A CN 101771591 A CN101771591 A CN 101771591A CN 200810241187 A CN200810241187 A CN 200810241187A CN 200810241187 A CN200810241187 A CN 200810241187A CN 101771591 A CN101771591 A CN 101771591A
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Abstract
The invention discloses a service transmission method and a service transmission system under an RRU and BBU loop network, which are used for improving the service transmission quality and avoiding dropped call of service. The service transmission method in a loop network system formed by a remote radio unit RRU and a base band unit BBU comprises that: the RRU and BBU adopt a first service channel for accessing the BBU through a first optical port of the BBU to transmit service; the RRU and BBU adopt a special channel for accessing the BBU through a second optical port of the BBU to perform time delay detection; when the first service channel is failed, the BBU and the RRU adopt a second service channel for accessing the BBU through the second optical port of the BBU to continue service transmission by utilizing a transmission time delay value measured by the special channel.
Description
Technical field
The present invention relates to communication technical field, relate in particular to business transmitting method and system under a kind of remote radio unit (RRU) (RRU, RemoteRadio Unit) and Base Band Unit (BBU, the Base Band Unit) annular networking.
Background technology
In the TD-SCDMA baseband extension system, use optical fiber to be connected between BBU and the RRU usually.In the certain applications scene, can use the mode of RRU series connection that multistage RRU is connected with BBU, realized the service channel of series connection, if therefore be used for the optical fiber that multistage RRU is together in series is broken down for a certain reason, then must cause part RRU to communicate by letter with BBU.
For addressing the above problem, the notion of RRU and BBU annular networking has been proposed in Ir interface (interface between BBU and the RRU) technology, be that multistage RRU connects with the BBU annular, each RRU can both insert BBU from two mouthful corresponding service passages of not sharing the same light, after one of them service channel breaks down, can switch to the another one service channel and continue to keep communicating by letter with BBU.
Fig. 1 shows the RRU annular and connects the topological diagram that inserts BBU, suppose that RRU0 and RRU1 insert BBU from the first light mouth (IF0) of BBU respectively, RRU2 and RRU3 insert BBU from the second light mouth (IF1) of BBU respectively, passage A, B, D, E are the service channels that the actual traffic data transmission is arranged, channel C only provides the physical channel, and does not have the actual traffic data transmission.As shown in Figure 2, suppose that link failure appears in the E point, affected RRU2 and RRU3 will enable reserve link C and insert BBU from another light mouth (IF0), recover professional transmission again.
In data transmission, the bottom link is divided into control signalling path and business datum passage, adopts the timesharing transmission, and Fig. 3 shows the control signaling of existing Ir standard use and the situation of business datum timesharing transmission.In the down link, all RRU will pass through the RRU of subordinate from the information of higher level RRU in the system, wherein, each RRU by its own IP address and MAC Address from belong to the control signaling of self from identification the information of higher level RRU, and carry out respective handling and reply, Data Position by fixed allocation is won the business datum that belongs to RRU at the corresponding levels from downlink data channel, and sends by respective antenna.In the up link, each RRU uses the channel transfer of fixed allocation to send to signaling and the data of BBU.
This shows, though the RRU in the annular networking system can insert BBU by two light mouths, a certain moment RRU a light port communications with BBU.In case this light mouth link corresponding breaks down, RRU can not continue to keep communicating by letter with BBU, causes RRU and BBU to be in the state of passive wait link-recovery.
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 on the throne 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 and BBU 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, so can cause professional call drop from professional channel failure.
In sum, prior art is under RRU and BBU 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 reconfigure relevant parameter, the needed time of whole process has surpassed the patient time of professional call drop, thereby cause professional call drop, cause quality of service relatively poor.
Summary of the invention
The embodiment of the invention provides business transmitting method and the system in a kind of RRU and the BBU annular networking system, in order to improve quality of service, avoids professional call drop.
A kind of RRU that the embodiment of the invention provides and the business transmitting method in the BBU annular networking system comprise:
BBU and RRU adopt the first service channel transport service that inserts this BBU from the first light mouth of this BBU; And,
Described BBU and RRU adopt the designated lane that inserts this BBU from the second light mouth of this BBU to carry out time delay detection;
When definite described first service channel broke down, the propagation delay time value that BBU and RRU utilize described designated lane to record adopted second service channel continuation transport service that inserts this BBU from the second light mouth of this BBU.
A kind of communication system that the embodiment of the invention provides comprises: Base Band Unit BBU and a plurality of remote radio unit (RRU) RRU, and wherein said BBU links to each other by annular networking with described a plurality of RRU;
Described RRU is used for the process that inserts the first service channel transport service of this BBU from the first light mouth of described BBU adopting, adopts the designated lane that inserts this BBU from the second light mouth of this BBU to carry out time delay detection; When definite described first service channel breaks down, utilize the propagation delay time value that records by described designated lane, adopt second service channel continuation transport service that inserts this BBU from the second light mouth of described BBU;
Described BBU is used for inserting first service channel of this BBU and the process of this RRU transport service at the first light mouth that adopts each RRU from this BBU, adopts each RRU to carry out time delay detection from the designated lane that the second light mouth of this BBU inserts this BBU; When first service channel of determining RRU breaks down, utilize the propagation delay time value that records by described designated lane, adopt this RRU to insert second service channel continuation transport service of this BBU from the second light mouth of this BBU.
In the embodiment of the invention, adopt the process of the first service channel transport service that inserts this BBU from the first light mouth of this BBU at BBU and RRU, described BBU and RRU adopt the designated lane that inserts this BBU from the second light mouth of this BBU to carry out time delay detection; When definite described first service channel breaks down, the propagation delay time value that BBU and RRU utilize described designated lane to record, employing inserts second service channel continuation transport service of this BBU from the second light mouth of this BBU, thereby make RRU when the current business passage breaks down, can also keep communicating by letter with BBU, thereby make RRU can be apace switch to the another one service channel from the service channel of fault, the assurance business is call drop not, has improved service transmission quality.
Description of drawings
Fig. 1 is the schematic diagram that the RRU annular inserts BBU in the prior art;
Fig. 2 is the schematic diagram that the RRU annular after service channel breaks down in the prior art inserts BBU;
Fig. 3 is a transmission schematic diagram of controlling signaling and business datum in the prior art;
Fig. 4 is the professional transfer process schematic diagram of RRU annular networking in the prior art;
A kind of transmission schematic diagram of controlling signaling and business datum that Fig. 5 provides for the embodiment of the invention;
Fig. 6 a kind ofly realizes the twin-channel schematic diagram of control signaling by the field programmable gate array (FPGA, field programmable gate array) among the RRU for what the embodiment of the invention provided;
The overall procedure schematic diagram of the business transmitting method in a kind of RRU annular networking system that Fig. 7 provides for the embodiment of the invention;
Under the RRU annular networking situation that Fig. 8 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 system that Fig. 9 provides for the embodiment of the invention;
Service channel schematic diagram after service channel switches in the RRU annular networking system that Figure 10 provides for the embodiment of the invention;
The idiographic flow schematic diagram of the business transmitting method in a kind of RRU annular networking system that Figure 11 provides for the embodiment of the invention;
The structural representation of a kind of communication system that Figure 12 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 and the BBU annular networking system, can be apace switches to the another one service channel from the service channel of fault in order to realize RRU, avoids professional call drop, improves quality of service.
At present in RRU and the BBU annular networking system, form annular though all RRU join end to end, the RRU from this annular networking system in essence is by two links access BBU, but an a certain moment RRU light port communications with BBU.After optical fiber disconnected, affected RRU inserted BBU from another light mouth, therefore need obtain set of parameter (IP address, antenna configurations, the configuration of IQ data channel, cell configuration etc.) again.Equally, for BBU, all need for this RRU stresses newly to set up a cover resource at BBU, this annular networking is realized is actually a kind of " link cold standby ", and this " link cold standby " will certainly cause professional call drop owing to finish the total consuming time excessive of link switchover.
The embodiment of the invention is considered and is disconnected to RRU from optical fiber link to insert the used time of BBU again short more, fault is just more little to the influence of business transmission, if RRU can keep communicating by letter with BBU always, then the RRU impression needs to insert again less than self, therefore business datum can be smoothly transitted on the backup traffic passage, then transmission that can interrupting service.Therefore, after if RRU inserts BBU, be kept for the designated lane of control channel simultaneously from two pairing different directions of light mouth (up direction and down direction) of BBU, then for same RRU, no matter which light mouth to insert BBU from, BBU can both use same IP address this RRU of unique identification, and can dispose same set of parameter (except the propagation delay time value) for its different service channel, behind a light mouth corresponding service channel failure, RRU still can communicate by letter with BBU by the designated lane of another light mouth correspondence, after BBU carries out simple delay compensation configuration to RRU, business switched on another light mouth corresponding service passage transmit, switching time is shorter, can reach the purpose that keeps professional, thereby realizes " chain circuit heat backup ".
In the embodiment of the invention, after being implemented in RRU access BBU, can need the bottom transmission to provide and control signaling duplex channel (being up designated lane and descending designated lane) by mouthful designated lane that the inserts BBU control channel simultaneously of never sharing the same light.As shown in Figure 5, descending control signaling passage in the existing communication system is marked off the downlink dedicated passage that each RRU can use, in like manner, in the upstream control signaling passage, mark off the up designated lane that allows BBU to transmit the control signaling, the two-way designated lane of control channel is provided so just for each RRU.
For each RRU, realize the method for control signaling by the designated lane transmitted in both directions as shown in Figure 6 by FPGA, at down direction, the service channel that is used for service data transmission still adopts transparent transmission mode service data transmission, be that each RRU will be transmitted to next stage RRU successively from the business datum of BBU, the reception data of each RRU are identical, and read the data that self need from these reception data.For the designated lane that is used for control channel, then adopt two control signaling parsing modules, resolve respectively from the control of the BBU in uplink and downlink direction signaling, also will be transferred to the first light mouth and the second light mouth of BBU respectively by up designated lane (promptly inserting the designated lane of BBU) and downlink dedicated passage (promptly inserting the designated lane of BBU) simultaneously from the message (comprising heartbeat message and time delay detection message etc.) of RRU processor at the corresponding levels from the second light mouth from the first light mouth.Up light mouth shown in Fig. 6 among the FPGA and descending light mouth are actually parallel series and staticizer (SERDES chip), have the function of detection fiber Link State, when optical fiber link just often, the SERDES chip is synchronous; When the optical fiber link fault, SERDES chip step-out, and produce alarm signal.That is to say that up light mouth is responsible for detecting the service channel fault whether that inserts BBU from the first light mouth; Descending light mouth is responsible for detecting the service channel fault whether that inserts BBU from the second light mouth.
When link failure occurring, in case for example RRU goes wrong by the designated lane that the first light mouth inserts BBU, because the link between the second light mouth of each RRU and BBU is normal, so each RRU still can continue to keep communicating by letter with BBU.When the processor among the RRU switched the data transfer direction of self place RRU, the FPGA among this RRU can finish the oral affair of second light that data resolution module is switched to BBU.So for RRU, only feel that service channel is switched, can not experience designated lane and break down.
Below in conjunction with accompanying drawing the technical scheme that the embodiment of the invention provides is described.
In the embodiment of the invention, for each RRU in the annular networking system sets up two designated lanes, be respectively first designated lane that inserts BBU from the first light mouth of BBU in advance, and second designated lane that inserts BBU from the second light mouth of BBU.BBU is handed down to corresponding RRU by first designated lane with the configuration parameter of first service channel, and current RRU adopts the first service channel transport service.Referring to Fig. 7, a kind of RRU that the embodiment of the invention provides and the business transmitting method in the BBU annular networking system totally comprise step:
S101, BBU and RRU adopt the first service channel transport service that inserts this BBU from the first light mouth of this BBU; And BBU and RRU employing are carried out time delay detection from the designated lane (i.e. second designated lane) that the second light mouth of this BBU inserts this BBU.
S102, when definite first service channel breaks down, BBU and RRU utilize from the second light mouth of this BBU and insert the propagation delay time value that the designated lane of this BBU records, and adopt second service channel that inserts this BBU from the second light mouth of this BBU to continue transport service.
Except the propagation delay time value, first service channel and second service channel of each RRU use same set of configuration parameter, make RRU when a service channel switches to another service channel, can directly adopt the configuration parameter of the service channel before switching on the service channel after the switching, to realize continuing of business.
Wherein, the same set of configuration parameter that first service channel of each RRU of the embodiment of the invention and second service channel are adopted 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, channel arrangement parameter and cell configuration parameter etc.
Provide concrete explaining below.
After BBU starts, all RRU in the annular networking system freely insert, freely select service channel to insert BBU by each RRU, promptly dynamically determine the service channel of the current employing of each RRU, all RRU might be the service channels that all adopts from the first light mouth or second light mouth access BBU; Perhaps, part RRU adopts the service channel that inserts BBU from the first light mouth, part RRU adopts the service channel that inserts BBU from the second light mouth, as shown in Figure 8, RRU1, RRU2 and RRU3 adopt the service channel that inserts BBU from the first light mouth, and RRU4, RRU5 and RRU6 adopt the service channel that inserts BBU from the second light mouth.
For each RRU, BBU goes up at two light mouths (the first light mouth and the second light mouth) and uses same set of IQ configuration data and identical RRU identifier, after guaranteeing that RRU adopts another service channel to insert BBU from another one light mouth, this RRU of BBU energy quick identification, realize the quick switching of BBU side, thereby further saved the needed time of service switchover passage.
Referring to Fig. 9, suppose the business of all having set up on each RRU, RRU1, RRU2 and RRU3 adopt the service channel that inserts BBU from the first light mouth, RRU4, RRU5 and RRU6 adopt the service channel that inserts BBU from the second light mouth, service channel between RRU1 and the RRU2 breaks down at this moment, cause the business transmission of RRU2 and RRU3 to be affected, promptly can't continue transport service by the service channel that inserts BBU from the first light mouth.
Contain the SERDES chip among each RRU, because SERDES chip step-out among the RRU2, fast detecting breaks down by the service channel that the first light mouth inserts BBU to self, and with the alarm mode notify self FPGA, by the FPGA among the RRU2 physical layer control word optical fiber alarm code (the Ir interfacing requires [1] 7.4) is set, generate warning information, comprising the service channel information that breaks down, this warning information is notified to RRU2 processor at the corresponding levels, BBU and affected RRU3 by the designated lane that inserts BBU from the second light mouth.After BBU received this warning information, BBU goes to enable RRU2 and RRU3 disposes at the IQ of the first light mouth, enabled RRU2 and RRU3 in the IQ of second light mouth configuration; Receive the FPGA warning information of RRU2 when the RRU2 processor, and after the FPGA among the RRU3 received the FPGA warning information among the RRU2 and reports the RRU3 processor, each adaptive switched clock at the corresponding levels of RRU2 and RRU3 was to standby service channel (promptly inserting the passage of BBU from the second light mouth).
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 warning information 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.
After switching clock, RRU2 and RRU3 adopt standby service channel to insert BBU from the second light mouth, 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 second light mouth of BBU, as shown in figure 10, RRU2 and RRU3 pass through RRU4, RRU5 and the RRU6 second light mouth access BBU from BBU respectively, and RRU1 continues the access BBU from original service channel from the first 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 configuration parameter of the service channel before switching to get final product, IP address, antenna configuration parameters, IQ data channel configuration parameter and the cell configuration parameter etc. that comprise channel arrangement 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 further realizing the RRU side switches.
After RRU switches to standby service channel from the fault service channel, RRU uses the propagation delay time value that records with the corresponding designated lane of this standby service channel 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, promptly satisfy the requirement of service communication, make professional the continuation.
Referring to Figure 11, the business transmitting method under the RRU annular networking that the embodiment of the invention provides specifically comprises:
First light mouth access process: the RRU determines to insert BBU from the first light mouth broadcasting of BBU at random.BBU is that each RRU in the annular networking system sets up the designated lane that inserts this BBU from the first light mouth, opens heartbeat detection by the designated lane that inserts this BBU from the first light mouth, and carries out time delay detection.
Second light mouth access process: the BBU is that each RRU in the annular networking system sets up the designated lane that inserts this BBU from the second light mouth, opens heartbeat detection by the designated lane that inserts this BBU from the second light mouth, and carries out time delay detection.
The above-mentioned first light mouth access process and the second light mouth access process can carry out simultaneously, be that BBU is that each RRU in the annular networking system can set up the designated lane that inserts this BBU from the first light mouth and the second light mouth simultaneously respectively, open heartbeat detection by the designated lane that inserts this BBU from the first light mouth and the second light mouth simultaneously respectively, and carry out time delay detection.
Parameter configuration flow process: BBU (is carrier wave antenna data channel arrangement parameter, antenna configuration parameters, channel arrangement parameter and cell configuration parameter etc. for each RRU distributes IP address, the IQ data channel of RRU, thereby set up current service channel, begun service data transmission by this service channel from first light mouth access BBU.
RRU and BBU fast detecting break down to current service channel from first light mouth access BBU.
Whether RRU and BBU judge from the service channel (standby service channel) of second light mouth access BBU available respectively, if it is available, then: BBU control can't insert the IQ loss of configuration of the pairing first light mouth of RRU of this BBU from the first light mouth, adopts the IQ configuration of the pairing second light mouth of this RRU.Can't the service channel of clock from fault be switched to from the service channel of second light mouth access BBU from the RRU of first light mouth access BBU.And adopt and to insert the propagation delay time value that the designated lane of BBU records from the second light mouth and carry out delay compensation, finish that business is switched to the operation that the service channel that inserts BBU from the second light mouth continues transmission.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 standby service channel, and whole process required time mainly comprises:
1) FPGA detection fiber link failure and notify time of affected RRU, usually＜1s, note is made Tc;
2) RRU switches to time of an other link with clock and service channel from faulty link, and about general 1s, note is made Ts;
Therefore, total time is T=Tc+Ts＜2s, and this incident is less than the time of judging professional call drop, thereby satisfies not call drop requirement of business.
Introduce the system that the embodiment of the invention provides below.
Referring to Figure 12, a kind of communication system that the embodiment of the invention provides comprises: BBU 10 and a plurality of RRU11, wherein said BBU 10 and described a plurality of RRU 11 link to each other by annular networking.
RRU 11, are used for the process that inserts the first service channel transport service of this BBU 10 from the first light mouth of described BBU 10 adopting, adopt the designated lane that inserts this BBU 10 from the second light mouth of this BBU 10 to carry out time delay detection; When definite this first service channel breaks down, utilize the propagation delay time value that records by this designated lane, adopt second service channel continuation transport service that inserts this BBU 10 from the second light mouth of described BBU 10.
Preferably, described RRU 11 comprises:
The first professional transmission unit 112 is used for the configuration parameter by first service channel, adopts the first service channel transport service.
Designated lane is set up unit 113, is used to set up the designated lane that inserts this BBU 10 from the second light mouth of BBU 10, and carries out time delay detection by this designated lane in the process of the first professional transmission unit 112 employings first service channel transport service.
The second professional transmission unit 115 is used to utilize the configuration parameter of second service channel, adopts second service channel to continue transport service.
Preferably, first service channel of described memory cell 111 storages and the configuration parameter of second service channel are same set of configuration parameter.
Preferably, described switch control unit 114 comprises:
Fault determining unit 31 is used for when definite first service channel breaks down, and triggers signalling trouble unit 32 and switch unit 33.
Preferably, described fault determining unit 31 comprises:
Detecting unit 311, whether first service channel that is used to detect the RRU 11 at self place breaks down, and when this first service channel breaks down, triggers signalling trouble unit 32 and switch unit 33.
Acquiring unit 312 is used for triggering signalling trouble unit 32 and switch unit 33 when obtaining the warning information that first service channel breaks down from another RRU.
Preferably, described BBU 10 comprises:
Configuration parameter allocation units 101 are used to first service channel of RRU 11 and the configuration parameter that second service channel distributes.
The first professional transmission unit 102 is used to adopt first service channel and this RRU 11 transport services of RRU 11.
Designated lane transmission unit 103 is used to adopt RRU 11 to carry out time delay detection from the designated lane that the second light mouth of this BBU 10 inserts this BBU 10.
The second professional transmission unit 105 is used for the configuration parameter of second service channel of the RRU 11 that breaks down by first service channel, adopts second service channel of this RRU 11 and this RRU 11 to continue transport services.
Preferably, described switch control unit 104 comprises:
Fault determining unit 20 is used for inserting the warning information of the designated lane reception of this BBU 10 from RRU 11 by the second light mouth from BBU 10, determines that according to this warning information first service channel of RRU 11 breaks down.
Propagation delay time notification unit 21, the propagation delay time value that the designated lane that is used for inserting this BBU 10 by the second light mouth from BBU 10 records is notified to RRU 11 by this first service channel transport service by this designated lane.
In sum, the embodiment of the invention adopts the process of the first service channel transport service that inserts this BBU from the first light mouth of this BBU at BBU and RRU, and BBU and RRU adopt the designated lane that inserts this BBU from the second light mouth of this BBU to carry out time delay detection; When definite this first service channel breaks down, the propagation delay time value that BBU and RRU utilize this designated lane to record, employing inserts second service channel continuation transport service of this BBU from the second light mouth of this BBU, thereby make RRU when the current business passage breaks down, can also keep communicating by letter with BBU, thereby make RRU can be apace switch to the another one service channel from the service channel of fault, the assurance business is call drop not, has improved service transmission quality.
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 (12)
1. the business transmitting method in remote radio unit (RRU) RRU and the Base Band Unit BBU annular networking system is characterized in that this method comprises:
BBU and RRU adopt the first service channel transport service that inserts this BBU from the first light mouth of this BBU; And,
Described BBU and RRU adopt the designated lane that inserts this BBU from the second light mouth of this BBU to carry out time delay detection;
When definite described first service channel broke down, the propagation delay time value that BBU and RRU utilize described designated lane to record adopted second service channel continuation transport service that inserts this BBU from the second light mouth of this BBU.
2. method according to claim 1 is characterized in that, when definite described first service channel broke down, described BBU and RRU utilized described propagation delay time value, and the step that adopts described second service channel to continue transport service comprises:
When BBU broke down when first service channel of determining RRU, the propagation delay time value that will record by described designated lane was notified to RRU by the first service channel transport service by this designated lane;
RRU by the first service channel transport service is when definite first service channel breaks down, clock is switched to second service channel from first service channel, and utilize and to insert the propagation delay time value that the designated lane of described BBU obtains from the second light mouth of described BBU and carry out delay compensation;
The RRU that the BBU and first service channel break down adopts this second service channel to continue transport service by the configuration parameter of second service channel of this RRU.
3. method according to claim 2 is characterized in that, the configuration parameter of the configuration parameter of second service channel of described RRU and first service channel of this RRU is same set of configuration parameter.
4. according to claim 2 or 3 described methods, it is characterized in that described BBU determines that the step that first service channel of RRU breaks down comprises:
When RRU breaks down when first service channel of determining self, by insert the designated lane of described BBU from the second light mouth of described BBU, the warning information that this first service channel is broken down sends to described BBU, and described BBU determines that according to described warning information this first service channel breaks down.
5. method according to claim 4 is characterized in that, described RRU comprises to the step of described BBU described alarm information noticing by described designated lane:
Described RRU sends to another RRU by described designated lane with described warning information;
Described another RRU determines that according to described warning information described first service channel breaks down, and by described designated lane described warning information is transmitted to described BBU.
6. a communication system is characterized in that, this system comprises: Base Band Unit BBU and a plurality of remote radio unit (RRU) RRU, and wherein said BBU links to each other by annular networking with described a plurality of RRU;
Described RRU is used for the process that inserts the first service channel transport service of this BBU from the first light mouth of described BBU adopting, adopts the designated lane that inserts this BBU from the second light mouth of this BBU to carry out time delay detection; When definite described first service channel breaks down, utilize the propagation delay time value that records by described designated lane, adopt second service channel continuation transport service that inserts this BBU from the second light mouth of described BBU;
Described BBU is used for inserting first service channel of this BBU and the process of this RRU transport service at the first light mouth that adopts each RRU from this BBU, adopts each RRU to carry out time delay detection from the designated lane that the second light mouth of this BBU inserts this BBU; When first service channel of determining RRU breaks down, utilize the propagation delay time value that records by described designated lane, adopt this RRU to insert second service channel continuation transport service of this BBU from the second light mouth of this BBU.
7. system according to claim 6 is characterized in that, described RRU comprises:
Memory cell, being used to store described BBU is the configuration parameter that described first service channel and second service channel distribute in advance;
The first professional transmission unit is used for the configuration parameter by described first service channel, adopts the described first service channel transport service;
Designated lane is set up the unit, is used to set up the designated lane that inserts this BBU from the second light mouth of described BBU, and carries out time delay detection by described designated lane in the described first professional transmission unit adopts the process of the described first service channel transport service;
Switch control unit is used for when definite described first service channel breaks down clock being switched to second service channel from first service channel, and utilizes the propagation delay time value that obtains by described designated lane to carry out delay compensation;
The second professional transmission unit is used to utilize the configuration parameter of described second service channel, adopts described second service channel to continue transport service.
8. system according to claim 7 is characterized in that, described switch control unit comprises:
The fault determining unit is used for when definite described first service channel breaks down, and triggers signalling trouble unit and switch unit;
The signalling trouble unit, when being used to receive the triggering of fault determining unit, the designated lane that inserts described BBU by the second light mouth from described BBU sends to described BBU with the warning information that this first service channel breaks down;
Switch unit when being used to receive the triggering of fault determining unit, switches to second service channel with clock from described first service channel, and utilizes the propagation delay time value that obtains by described designated lane to carry out delay compensation.
9. system according to claim 8 is characterized in that, described fault determining unit comprises:
Detecting unit, whether first service channel that is used to detect the RRU at self place breaks down, and when this first service channel breaks down, triggers signalling trouble unit and switch unit;
Acquiring unit is used for triggering signalling trouble unit and switch unit when obtaining the warning information that first service channel breaks down from another RRU.
10. according to claim 7,8 or 9 described systems, it is characterized in that described first service channel of described cell stores and the configuration parameter of described second service channel are same set of configuration parameter.
11. system according to claim 6 is characterized in that, described BBU comprises:
The configuration parameter allocation units are used to first service channel of RRU and the configuration parameter that second service channel distributes;
The first professional transmission unit is used to adopt first service channel and this RRU transport service of RRU;
The designated lane transmission unit is used to adopt RRU to carry out time delay detection from the designated lane that the second light mouth of this BBU inserts this BBU;
Switch control unit is used for when first service channel of determining RRU breaks down, and the propagation delay time value that will record by described designated lane is notified to RRU by this first service channel transport service by described designated lane;
The second professional transmission unit is used for the configuration parameter of second service channel of the RRU that breaks down by first service channel, adopts second service channel of this RRU and this RRU to continue transport service.
12. system according to claim 11 is characterized in that, described switch control unit comprises:
The fault determining unit is used for determining according to this warning information that by the warning information of described designated lane reception from RRU first service channel of RRU breaks down;
The propagation delay time notification unit is used for the propagation delay time value that will record by described designated lane and is notified to RRU by this first service channel transport service by described designated lane.
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