CN103684580A - Radio remote unit and link fault reporting method thereof as well as wireless communication system - Google Patents
Radio remote unit and link fault reporting method thereof as well as wireless communication system Download PDFInfo
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- CN103684580A CN103684580A CN201210319087.XA CN201210319087A CN103684580A CN 103684580 A CN103684580 A CN 103684580A CN 201210319087 A CN201210319087 A CN 201210319087A CN 103684580 A CN103684580 A CN 103684580A
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Abstract
The invention discloses a radio remote unit (RRU) and a link fault reporting method thereof as well as a wireless communication system. The method comprises the following steps: 1, judging whether a downlink and/or uplink optical fiber link fault is caused between a current RRU and a previous RRU, if so, going to the step 2, and otherwise, going to the step 3; 2, calculating a serial number of the current RRU through the previous RRU, resetting a fault warning control word in combination with a congruent relationship between a bit position in the fault warning control word and a predetermined serial number, and going to the step 3; 3, sending the fault warning control word to a more previous RRU by the previous RRU, and returning to the step 1; reporting the fault warning control word to a BBU (Base Band Unit) until a first RRU detects whether the downlink and/or uplink optical fiber link fault is caused between the first RRU and the BBU. Through the technical scheme, the problems that the uplink optical fiber link fault cannot be detected and the BBU cannot accurately obtain the position of the downlink optical fiber link fault closest to the BBU are solved.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of method, Remote Radio Unit and wireless communication system of Remote Radio Unit reporting links fault.
Background technology
At present in wireless communication system, base station adopts baseband processing unit (BBU, Base Band Unit) to add the distributed structure/architecture of Remote Radio Unit (RRU, Radio Remote Unit) more.Between BBU and RRU, with optical fiber, be connected, a BBU can support the RRU of a plurality of cascades.Interface between BBU and RRU is followed common public radio interface (CPRI, Common Public Radio Interface) standard, each RRU has two light mouths, one from (Slave) light mouth, a master (Master) light mouth, one of them light mouth is connected with upper level RRU or BBU, and another light mouth is connected with next stage RRU or another BBU, and each light mouth comprises receiving terminal (rx) and transmitting terminal (tx).According to practical application scene, between BBU and RRU, can there is different networking modes, comprise star-like, chain, looped network and two BBU backup etc.
In CPRI interface standard, for the RRU of cascade, comprise the concept of predetermined rank order and self actual sequence number, predetermined rank order is for BBU, and self actual sequence number is for RRU.The corresponding one-level RRU of each predetermined rank order, the identification marking that is equivalent to RRU, BBU can identify corresponding RRU by each predetermined rank order, simultaneously, the corresponding relation of bit and predetermined rank order identification fault point in the fault warning control word that BBU can also report according to RRU, conventionally, the predetermined rank order of the first order RRU nearest apart from BBU is start sequence number, and the predetermined rank order of other RRU at different levels is by adding successively 1 apart from BBU order from the near to the remote.Self actual sequence number need to be delivered to RRU at different levels by downlink optical fiber link, concrete: first order RRU by and BBU between downlink optical fiber link receive start sequence number or the start sequence number that BBU issues and subtract 1, first order RRU is using this start sequence number as self actual sequence number, first order RRU sends self actual sequence number of first order RRU by downlink optical fiber chain road direction second level RRU, second level RRU adds 1 self the actual sequence number that obtains second level RRU on the basis of self actual sequence number of first order RRU, the like, RRU at different levels receive by downlink optical fiber link self actual sequence number that upper level RRU sends upper level RRU, and from the mode that adds 1, obtain self actual sequence number on the basis of self actual sequence number of this upper level RRU.RRU to the method for BBU reporting links fault is: RRU at the corresponding levels receives the fault warning control word that next stage RRU sends, RRU at the corresponding levels detects between itself and upper level RRU whether occur downlink optical fiber link failure, if, according to the corresponding relation of bit and predetermined rank order in the fault warning control word of the actual sequence number of RRU at the corresponding levels self and foundation in advance, after being inserted to this fault warning control word corresponding bits position, this downlink optical fiber link failure sends upper level RRU to, upper level RRU carries out sending upper level RRU again to after same operation again, RRU upwards forwards until BBU so step by step.
Take chain networking mode as example, as shown in Figure 1, BBU0 is by optical fiber and three RRU cascades, form uplink optical fibers link and the downlink optical fiber link of signal transmission, downlink optical fiber link in this figure refers to signal and by BBU0, is transferred to the formed link of RRU0(optical fiber A0 being adjacent), by RRU0, transfer to the formed link of RRU1(optical fiber A1), or by RRU1, transfer to the formed link of RRU2(optical fiber A2); Uplink optical fibers link refers to signal and transfers to the formed link of RRU1(optical fiber B2 by RRU2), by RRU1, transfer to the formed link of RRU0(optical fiber B1), or by RRU0, transfer to BBU0(optical fiber B 0 formed link); In CPRI interface standard, these three RRU to the method for BBU0 reporting links fault are:
Whether step a, RRU2 there is downlink optical fiber link failure (being whether the formed link of optical fiber A2 breaks down) between the rx end of Slave light mouth detects itself and RRU1, if, according to the corresponding relation of bit and predetermined rank order in self actual sequence number and default fault warning control word, this downlink optical fiber link failure is inserted to the corresponding bit of fault warning control word, by this fault warning control word, the tx end by Slave light mouth sends to RRU1 again, if not, the initial value of fault warning control word is sent to RRU1;
Step c, the rx termination of the Master light mouth of RRU1 is received the fault warning control word that RRU2 sends, whether RRU1 there is downlink optical fiber link failure (being whether the formed link of optical fiber A1 breaks down) between the rx end of Slave port detects itself and RRU0, if, according to self actual sequence number and above-mentioned corresponding relation, this downlink optical fiber link failure is inserted to the fault warning control word that RRU2 passes to it, by this fault warning control word, the tx end by Slave light mouth sends to RRU0 again, if not, the tx end of the initial value of fault warning control word of RRU2 being passed to it by Slave light mouth directly sends to RRU0,
Steps d, the rx termination of the Master light mouth of RRU0 is received the fault warning control word that RRU1 sends, whether RRU0 there is downlink optical fiber link failure (being whether the formed link of optical fiber A0 breaks down) between the rx end of Slave port detects itself and BBU0, if, according to self actual sequence number and above-mentioned corresponding relation, this downlink optical fiber link failure is inserted to the fault warning control word that RRU1 passes to it, by this fault warning control word, the tx end by Slave light mouth sends to BBU0 again, if not, the former fault warning control word of RRU1 being passed to it directly sends to BBU0 by the tx end of Slave light mouth,
BBU0 receives by the rx termination of bbu_p1 light mouth the fault warning control word that RRU0 sends, according to the occurrence positions of this fault warning control word and above-mentioned corresponding relation identification fault.
To the mode of BBU reporting links fault, there is following defect in the above-mentioned CPRI of utilization interface standard:
1, between BBU and RRU, have two optical fiber links of uplink and downlink, utilize CPRI interface standard, RRU can only report BBU by the fault of downlink optical fiber link, and cannot detect uplink optical fibers link failure.
2,, according to CPRI interface standard, for RRU, self actual sequence number is transmitted by downlink optical fiber link.When downlink optical fiber link occurs fault between RRU at the corresponding levels and upper level RRU, the transmission of RRU sequence number can stop, RRU at the corresponding levels will be regarded as first order RRU, himself actual sequence number will be set to as start sequence number (being generally 0), and the RRU of subordinate can carry out obtaining self actual sequence number from adding according to this start sequence number, this cause the RRU that breaks down with and the RRU of subordinate self actual sequence number and the predetermined rank order obtained be not inconsistent, on that bit (such as the bit 0 corresponding with start sequence number) that the RRU of generation downlink optical fiber link failure can only be corresponding with start sequence number in fault warning control word, insert optical fiber link fault warning, in the fault warning control word that causes BBU to receive, there is the RRU of the bit representative of alarm not conform to the actual RRU that downlink optical fiber link failure occurs.
Summary of the invention
The invention provides a kind of method, Remote Radio Unit and wireless communication system of Remote Radio Unit reporting links fault, solve in prior art and cannot detect uplink optical fibers link failure, and BBU cannot accurately learn the problem apart from the position of its nearest downlink optical fiber link failure.
For solving the problems of the technologies described above, the present invention takes following technical scheme.
A method for Remote Radio Unit reporting links fault, described baseband processing unit, by optical fiber and a plurality of Remote Radio Unit cascade, forms uplink optical fibers link and the downlink optical fiber link of signal transmission; Wherein, downlink optical fiber link refers to signal and by baseband processing unit, is transferred to the first order Remote Radio Unit being adjacent, or from Remote Radio Unit at the corresponding levels, transfers to the next stage Remote Radio Unit being adjacent; Uplink optical fibers link refers to signal and by Remote Radio Unit at the corresponding levels, is transferred to the upper level Remote Radio Unit being adjacent, or transfers to baseband processing unit by first order Remote Radio Unit, and the method comprises the following steps:
Step 1, Remote Radio Unit at the corresponding levels detect between itself and adjacent upper level Remote Radio Unit whether occur downlink optical fiber link failure, described upper level Remote Radio Unit detects between itself and described Remote Radio Unit at the corresponding levels whether occur uplink optical fibers link failure, if there is one to break down in both, enter step 2, if both all do not break down, enter and enter step 3;
Step 2, described upper level Remote Radio Unit obtain self actual sequence number by downlink optical fiber link, according to self actual sequence number, add 1, calculate the sequence number of described Remote Radio Unit at the corresponding levels; According to the corresponding relation of bit and predetermined rank order in the sequence number of the described Remote Radio Unit at the corresponding levels obtaining and default fault warning control word, by the corresponding bits position that is sent to step by step the fault warning control word of described upper level Remote Radio Unit by afterbody Remote Radio Unit, be 1 or 0, contrary is 0 or 1 by other bit positions of described fault warning control word, enters and enters step 3;
Step 3, described upper level Remote Radio Unit send to the again upper level Remote Radio Unit adjacent with described upper level Remote Radio Unit by fault warning control word, return to step 1;
Step 4 is until first order Remote Radio Unit detects between itself and baseband processing unit whether occur downlink optical fiber link failure, described baseband processing unit detects between itself and described first order Remote Radio Unit whether occur uplink optical fibers link failure, if both all do not break down, first order Remote Radio Unit reports baseband processing unit by fault warning control word.
Further, in step 4, if there is descending and/or uplink optical fibers link failure between first order Remote Radio Unit and baseband processing unit, after first order Remote Radio Unit reports baseband processing unit by fault warning control word, also comprise: described baseband processing unit is according to the predetermined rank order of described first order Remote Radio Unit and described corresponding relation, by the corresponding bits position of fault warning control word, being 1 or 0, is 0 or 1 by other bit positions of described fault warning control word on the contrary.
Further, in step 4, if there is downlink optical fiber link failure between first order Remote Radio Unit and baseband processing unit, before first order Remote Radio Unit reports baseband processing unit by fault warning control word, also comprise: first order Remote Radio Unit is according to self actual sequence number and described corresponding relation, by the corresponding bits position of described fault warning control word, being 1 or 0, is 0 or 1 by other bit positions of described fault warning control word on the contrary.
Further, step 1 is specially: described upper level Remote Radio Unit detects between itself and described Remote Radio Unit at the corresponding levels whether occur uplink optical fibers link failure, if so, enters step 2; If not, described Remote Radio Unit at the corresponding levels detects between itself and described upper level Remote Radio Unit whether occur downlink optical fiber link failure; If so, detected described downlink optical fiber link failure is sent to described upper level Remote Radio Unit, enter step 2.
A kind of Remote Radio Unit, described Remote Radio Unit is by any in a plurality of Remote Radio Unit of optical fiber and baseband processing unit cascade, described baseband processing unit and described a plurality of Remote Radio Unit form uplink optical fibers link and the downlink optical fiber link of signal transmission, wherein, downlink optical fiber link refers to signal and transfers to described Remote Radio Unit by baseband processing unit or adjacent upper level Remote Radio Unit, or transfer to adjacent next stage Remote Radio Unit by described Remote Radio Unit, uplink optical fibers link refers to signal and by described Remote Radio Unit, is transferred to upper level Remote Radio Unit or the baseband processing unit being adjacent, or transfer to described Remote Radio Unit by adjacent next stage Remote Radio Unit, described Remote Radio Unit comprises: downlink optical fiber link failure detection unit, self actual sequence number acquiring unit, sequence number computing unit, fault warning control word reset cell, fault warning transmitting element and fault warning receiving element, wherein,
Described downlink optical fiber link failure detection unit is adjacent between upper level Remote Radio Unit or baseband processing unit, whether to occur downlink optical fiber link failure for detection of described Remote Radio Unit;
The downlink optical fiber link failure of described fault warning transmitting element for described downlink optical fiber link failure detection unit inspection is gone out, and fault warning control word sends to described upper level Remote Radio Unit or baseband processing unit;
Described fault warning receiving element is for receiving the downlink optical fiber link failure between the detected described Remote Radio Unit of adjacent next stage Remote Radio Unit and described next stage Remote Radio Unit; Also for receiving the fault warning control word that is sent to step by step described Remote Radio Unit by afterbody Remote Radio Unit;
Described self actual sequence number acquiring unit is for obtaining self actual sequence number by downlink optical fiber link;
Described sequence number computing unit is for adding the sequence number of the described next stage Remote Radio Unit of 1 calculating according to the actual sequence number of described Remote Radio Unit self;
The sequence number of the described next stage Remote Radio Unit that described fault warning control word reset cell calculates for basis and default fault warning control word bit and the corresponding relation of predetermined rank order, the corresponding bits position of the fault warning control word that described fault warning receiving element is received is 1 or 0, is 0 or 1 on the contrary by other bit positions of described fault warning control word.
Further, if described Remote Radio Unit is the first order Remote Radio Unit adjacent with described baseband processing unit, described fault warning control word reset cell is also for according to self actual sequence number and described corresponding relation of described first order Remote Radio Unit, by the corresponding bits position of described fault warning control word, being 1 or 0, is 0 or 1 by other bit positions of described fault warning control word on the contrary.
Further, described Remote Radio Unit also comprises uplink optical fibers link failure detection unit, and described uplink optical fibers link failure detection unit is adjacent between next stage Remote Radio Unit, whether to occur uplink optical fibers link failure for detection of described Remote Radio Unit.
A wireless communication system, comprising: the Remote Radio Unit of baseband processing unit and a plurality of cascades; Described Remote Radio Unit is the Remote Radio Unit described in above-mentioned any one; Described baseband processing unit is for sending start sequence number by downlink optical fiber chain road direction the first Remote Radio Unit, also with receiving the fault warning control word transmitting step by step through each Remote Radio Unit.
Further, if there is descending and/or uplink optical fibers link failure between first order Remote Radio Unit and baseband processing unit, described baseband processing unit is also for according to the default sequence number of first order Remote Radio Unit and default fault warning control word bit and the corresponding relation of default sequence number, by the corresponding bits position of fault warning control word, being 1 or 0, is 0 or 1 by other bit positions of described fault warning control word on the contrary.
Further, described baseband processing unit also for detection of and described first order Remote Radio Unit between whether there is uplink optical fibers link failure.
Because RRU and BBU are cascade connections, the downlink optical fiber link of certain one-level RRU breaks down, and this grade of RRU all RRU below cannot normally work, so for user, needing most what be concerned about and determine is from the nearest fault point of BBU.In the present invention, if there is downlink optical fiber link failure between RRU at the corresponding levels and adjacent upper level RRU, self actual sequence number of RRU at the corresponding levels will be set to start sequence number, but, the sequence number of this upper level RRU is not subject to the impact of this fault, therefore, the sequence number that adds 1 these corresponding levels RRU calculating according to self actual sequence number of this upper level RRU is reset the method for fault warning control word than prior art, has improved accuracy; If this upper level RRU and also occurred again downlink optical fiber link failure between upper level RRU, cause self actual sequence number of this upper level RRU not also to be inconsistent with its predetermined rank order, so by this upper level RRU replacement to fault warning control word again, make finally to report in the fault warning control word of BBU, only embody from the position of the nearest downlink optical fiber link failure of BBU.
Accompanying drawing explanation
Fig. 1 is the wireless communication system schematic diagram of existing chain networking mode;
The flow chart of the method for the Remote Radio Unit reporting links fault that Fig. 2 provides for one embodiment of the invention;
The wireless communication system schematic diagram of the chain networking mode that Fig. 3 provides for one embodiment of the invention;
Fig. 4 is in the wireless communication system shown in Fig. 3, the flow chart of the method for Remote Radio Unit reporting links fault;
The Remote Radio Unit schematic diagram that Fig. 5 provides for one embodiment of the invention.
Embodiment
In the present invention, BBU, by optical fiber and a plurality of RRU cascade, forms uplink optical fibers link and the downlink optical fiber link of signal transmission; Downlink optical fiber link refers to signal and by BBU, is transferred to the first order RRU being adjacent, or transfers to from RRU at the corresponding levels the next stage RRU being adjacent; Uplink optical fibers link refers to signal and by RRU at the corresponding levels, is transferred to the upper level RRU being adjacent, or transfers to BBU by first order RRU.Up, downlink optical fiber link failure includes but not limited to the various optical fiber link faults such as light signal loss, LOF.Fault warning control word includes but not limited to the alarm control words such as loss of signal alarm control word, LOF alarm control word.
The present invention, for the RRU of cascade, comprises the concept of predetermined rank order and self actual sequence number, and predetermined rank order is for BBU, and self actual sequence number is for RRU.The corresponding one-level RRU of each predetermined rank order, the identification marking that is equivalent to RRU, BBU can identify corresponding RRU by each predetermined rank order, simultaneously, the corresponding relation of bit and predetermined rank order identification fault point in the fault warning control word that BBU can also report according to RRU, conventionally, the predetermined rank order of the first order RRU nearest apart from BBU is start sequence number, and the predetermined rank order of other RRU at different levels is by adding successively 1 apart from BBU order from the near to the remote.Therefore, the present invention need to preset the predetermined rank order of the RRU at different levels that BBU supports, and the bit of fault warning control word and the corresponding relation of predetermined rank order, nearest such as setting with BBU, the predetermined rank order of the first order RRU adjacent with BBU is start sequence number, and the predetermined rank order of other Remote Radio Unit at different levels is by adding successively 1 apart from BBU order from the near to the remote, again according to the number of the RRU of cascade, setting fault warning control word is comprised of the bit of corresponding number, and set up the corresponding relation of bit and predetermined rank order in fault warning control word, make bit corresponding one by one with predetermined rank order, this corresponding relation is kept in BBU and RRU at different levels, BBU can identify corresponding RRU by each predetermined rank order, the corresponding relation of bit and predetermined rank order identification fault point in the fault warning control word reporting according to RRU, RRU at different levels can be according to self actual sequence number and this corresponding relation coupling fault warning control word corresponding bits position.Such as: BBU is by n RRU of optical fiber cascade, predetermined rank order comprises that 0 to n-1, can set so the fault warning control word being formed by n bit, and bit is corresponding one by one with predetermined rank order, such as: position 0 is corresponding with sequence number 0, position 1 is corresponding with sequence number 1, position 2 is corresponding with sequence number 2, by that analogy, position n-1 is corresponding with sequence number n-1.
Self actual sequence number need to be delivered to RRU at different levels by downlink optical fiber link, concrete: first order RRU by and BBU between downlink optical fiber link receive start sequence number or the start sequence number that BBU issues and subtract 1, first order RRU is using this start sequence number as self actual sequence number, first order RRU sends self actual sequence number of first order RRU by downlink optical fiber chain road direction second level RRU, second level RRU adds 1 self the actual sequence number that obtains second level RRU on the basis of self actual sequence number of first order RRU, the like, RRU at different levels receive by downlink optical fiber link self actual sequence number that upper level RRU sends upper level RRU, and from the mode that adds 1, obtain self actual sequence number on the basis of self actual sequence number of this upper level RRU.For other grade of RRU except first order RRU, if there is fault in the downlink optical fiber link between itself and upper level RRU, self the actual sequence number that causes himself and sequence at the RRU of subordinate thereafter is not all inconsistent with predetermined rank order, self actual sequence number of the RRU at the corresponding levels breaking down will be set to start sequence number, the impact that sequence is all subject to this fault in self actual sequence number of the RRU of subordinate is thereafter serialization again, but self the not impact of actual sequence number of the higher level RRU before it for sequence.For first order RRU, because himself actual sequence number itself is exactly start sequence number, no matter whether descending the and/or uplink optical fibers link therefore between itself and BBU breaks down, himself actual sequence number is consistent with its predetermined rank order all the time, and the sequence number of other arbitrary RRU all not have to affect.
The method of the Remote Radio Unit reporting links fault that Fig. 2 provides for one embodiment of the invention, comprises following flow process:
S21, RRU at the corresponding levels detect between itself and adjacent upper level RRU whether occur downlink optical fiber link failure, described upper level RRU detects between itself and described RRU at the corresponding levels whether occur uplink optical fibers link failure, in both, there is one to break down, if there is descending and/or uplink optical fibers link failure between RRU at the corresponding levels and adjacent upper level RRU, enter step S22, if both all do not break down, enter and enter step S23;
Step S21 is specifically as follows: this upper level RRU detects between itself and this corresponding levels RRU whether occur uplink optical fibers link failure, if so, enters step S22; If not, these corresponding levels RRU detects between itself and this upper level RRU whether occur downlink optical fiber link failure; If so, detected this downlink optical fiber link failure and fault warning control word are sent to this upper level RRU, enter step S22, if not, these corresponding levels RRU only needs fault warning control word to send to this upper level RRU, enters step S23.
S22, this upper level RRU add the sequence number of these corresponding levels of 1 calculating RRU according to self actual sequence number, according to the corresponding relation of bit and predetermined rank order in the sequence number of these corresponding levels RRU calculating and default fault warning control word, by the corresponding bits position of fault warning control word, be 1(or 0), contrary is 0(or 1 by other bit positions of this fault warning control word), enter step S23;
S23, this upper level RRU send to the again upper level RRU adjacent with this upper level RRU by fault warning control word, enter step S24;
Step S23 is specifically as follows: according to the corresponding relation of bit and predetermined rank order in the sequence number of these corresponding levels RRU calculating and default fault warning control word, by the corresponding bits position of this fault warning control word, being 1, is 0 by other bit positions of this fault warning control word on the contrary; Or by the corresponding bits position of this fault warning control word, being 0, is 1 by other bit positions of this fault warning control word on the contrary; Again the fault warning control word after resetting is sent to the again upper level RRU adjacent with this upper level RRU.
S24, repeating step S21 to S23, until first order RRU detects between itself and BBU whether occur downlink optical fiber link failure, described BBU detects between itself and described first order RRU whether occur uplink optical fibers link failure, if both all do not break down, first order RRU reports BBU by fault warning control word.
Because first order RRU does not exist adjacent upper level RRU, therefore, the RRU at the corresponding levels in step S21 does not comprise first order RRU, needs to supplement the detection of descending between first order RRU and BBU and/or uplink optical fibers link failure in step S24.
Further, in step S24, if there is descending and/or uplink optical fibers link failure between first order RRU and BBU, after first order RRU reports BBU by fault warning control word, also comprise: BBU is according to the predetermined rank order of described first order RRU and described corresponding relation, by the corresponding bits position of fault warning control word, be 1(or 0), by other bit positions of described fault warning control word, be 0(or 1 on the contrary).
Or, in step S24, if there is downlink optical fiber link failure between first order RRU and BBU, before first order RRU reports BBU by fault warning control word, also comprise: first order RRU is according to self actual sequence number and described corresponding relation, by the corresponding bits position of described fault warning control word, be 1(or 0), by other bit positions of described fault warning control word, be 0 (or 1) on the contrary, then the fault warning control word after resetting is reported to BBU.
From above flow process, even if in step S21, between RRU at the corresponding levels and adjacent upper level RRU, there is downlink optical fiber link failure, cause self actual sequence number of RRU at the corresponding levels to be set to start sequence number, but, self actual sequence number of its upper level RRU is not subject to the impact of this fault, therefore, in step S22, the sequence number that adds 1 these corresponding levels RRU calculating according to self actual sequence number of this upper level RRU is reset the method for fault warning control word than prior art, has improved accuracy, even if this upper level RRU and also occurred again downlink optical fiber link failure between upper level RRU, cause self actual sequence number of this upper level RRU to be also set to start sequence number, so by repeating step S21 to S23, the replacement of upper level RRU to fault warning control word again, be specially: according to this sequence number that self actual sequence number of upper level RRU adds 1 this upper level RRU calculating again, by the corresponding bits position of fault warning control word, be 1(or 0), contrary is 0(or 1 by other bit positions of fault warning control word), make finally to report in the fault warning control word of BBU, only embody from the position of the nearest downlink optical fiber link failure of BBU.
The wireless communication system of the chain networking mode that Fig. 3 provides for one embodiment of the invention, as shown in Figure 3, BBU0 is by optical fiber and three RRU cascades, form uplink optical fibers link and the downlink optical fiber link of signal transmission, downlink optical fiber link in this figure refers to signal and by BBU0, is transferred to the formed link of RRU0(optical fiber A0 being adjacent), by RRU0, transfer to the formed link of RRU1(optical fiber A1), or by RRU1, transfer to the formed link of RRU2(optical fiber A2); Uplink optical fibers link refers to signal and transfers to the formed link of RRU1(optical fiber B2 by RRU2), by RRU1, transfer to the formed link of RRU0(optical fiber B1), or by RRU0, transfer to the formed link of BBU0(optical fiber B0).Preset the predetermined rank order of RRU at different levels, and the bit of fault warning control word and the corresponding relation of this predetermined rank order, such as: set with BBU nearest, the predetermined rank order of the RRU0 adjacent with BBU is start sequence number 0, the predetermined rank order of other RRU at different levels is by adding successively 1 apart from BBU0 order from the near to the remote, the predetermined rank order that is RRU1 is 1, the predetermined rank order of RRU2 is 2, if optical fiber A0, the words that the formed link of A1 and A2 does not all break down, self actual sequence number that RRUO obtains conforms to and is 0 with its predetermined rank order, self actual sequence number that RRU1 obtains conforms to and is 1 with its predetermined rank order, self actual sequence number that RRU2 obtains conforms to and is 2 with its predetermined rank order.According to the number of the RRU of cascade, set fault warning control word and formed by 3 bits again, such as: be position 2, position 1, position 0 from left to right successively; Finally set up the corresponding relation of bit and predetermined rank order in fault warning control word, make bit corresponding one by one with predetermined rank order, such as: position 0 is corresponding with sequence number 0, position 1 is corresponding with sequence number 1, position 2 is corresponding with sequence number 2, and this corresponding relation is kept in BBU0 and RRU at different levels.In wireless communication system shown in Fig. 3, the method for Remote Radio Unit reporting links fault as shown in Figure 4, comprises the following steps:
Whether S 401, RRU1 there is uplink optical fibers link failure (being whether the formed link of optical fiber B2 breaks down) between the rx end of Master port detects itself and RRU2, if, the rx termination of the Master light mouth of RRU1 is received the initial value of the fault warning control word of RRU2 transmission, enter step S403, if not, enter step S402.
Whether S 402, RRU2 there is downlink optical fiber link failure (being whether the formed link of optical fiber A2 breaks down) between the rx end of Slave light mouth detects itself and RRU1, if, the rx termination of the Master light mouth of RRU1 is received initial value and this downlink optical fiber link failure of the fault warning control word of RRU2 transmission, enter step S403, if not, the rx termination of the Master light mouth of RRU1 is received the initial value of the fault warning control word of RRU2 transmission, enters step S404.
What RRU2 sent is the initial value of fault warning control word, as " 000 ", even if there is downlink optical fiber link failure (being the formed link of optical fiber A2) and/or uplink optical fibers link failure (being the formed link of optical fiber B2) between RRU2 and RRU1, all without by RRU2, fault being inserted to this fault warning control word, this is different from the mode that sends to again RRU1 after prior art RRU2 resets to this fault warning control word according to self actual sequence number of obtaining.
S403, RRU1 add the sequence number of 1 this RRU2 of calculating according to self actual sequence number of obtaining, according to the corresponding relation of bit and predetermined rank order in the fault warning control word of preserving in the sequence number of the RRU2 calculating and RRU1, find out in the fault warning control word receiving in step S402 and this sequence number corresponding bits position, by this corresponding bits position, be 1, by other bit positions of this fault warning control word, be 0, enter step S404;
S404, RRU1 send to the adjacent radio frequency remote unit RRU of upper level again 0 by fault warning control word, enter step S405;
If all there is fault in the formed link of A1 and A2, RRU1 is regarded as first order RRU, its self actual sequence number of obtaining is start sequence number 0, the sequence number that RRU1 adds 1 RRU2 calculating according to sequence number 0 is so 1, known according to the corresponding relation of bit and predetermined rank order in fault warning control word, sequence number 1 correspondence be position 1, RRU1 is set to 1 by the position 1 of fault warning control word so, other bits (position 0 and position 2) are all set to 0, obtain fault warning control word 010, and send to RRU0.
If the formed link of A1 does not break down, there is fault in the formed link of A2, because no matter whether the formed link of A0 breaks down, self actual sequence number that RRU0 obtains is consistent with its predetermined rank order all the time, and the sequence number of other arbitrary RRU is not all had to impact, therefore, self actual sequence number that RRU1 obtains is 1, the sequence number that RRU1 adds 1 RRU2 calculating according to self actual sequence number is 2, in the fault warning control word of preserving in RRU1, the corresponding relation of bit and predetermined rank order is known, sequence number 2 correspondences be position 2, RRU1 is set to 1 by the position 2 of fault warning control word so, other bits (position 0 and position 1) are all set to 0, obtain fault warning control word 100, and send to RRU0.
If the formed link of A1 and A2 does not all break down, in step S404, RRU1 sends in the fault warning control word and step S402 of RRU0, and the fault warning control word that RRU2 issues RRU1 is consistent, is the initial value " 000 " of fault warning control word.
The rx termination of the Master light mouth of S405, RRU0 is received the fault warning control word that RRU1 sends.Be specially the initial value " 000 " of the fault warning control word in above-mentioned steps S402, or the fault warning control word 010 or 100 in above-mentioned steps S404.
Whether S406, RRU0 there is uplink optical fibers link failure (being whether the formed link of optical fiber B1 breaks down) between the rx end of Master port detects itself and RRU1, if, the fault warning control word that the rx termination of the Master light mouth of RRU0 is received RRU1 transmission enters step S408, if not, enter step S407.
Whether S407, RRU1 there is downlink optical fiber link failure (being whether the formed link of optical fiber A1 breaks down) between the rx end of Slave light mouth detects itself and RRU0, if, the rx termination of the Master light mouth of RRU0 is received fault warning control word and this downlink optical fiber link failure that RRU1 sends, enter step S408, if not, the rx termination of the Master light mouth of RRU0 is received the fault warning control word that RRU1 sends, and enters step S409.
S408, RRU0 add the sequence number of 1 calculating RRU1 according to self actual sequence number of obtaining, according to the corresponding relation of bit and predetermined rank order in the fault warning control word of preserving in the sequence number of the RRU1 calculating and RRU0, find out in the fault warning control word receiving in step S45 and this sequence number corresponding bits position, by this corresponding bits position, being 1, is 0 by other bit positions of this fault warning control word;
Because no matter whether the formed link of A0 breaks down, self actual sequence number that RRU0 obtains is consistent with its predetermined rank order all the time, and the sequence number of other arbitrary RRU is not all had to impact, therefore, the sequence number that RRU0 adds 1 RRU1 calculating according to self actual sequence number is 1, no matter the fault warning control word receiving in step S45 is 010, 100 or 000, RRU0 is known according to the corresponding relation of bit and predetermined rank order in the fault warning control word of preserving in the sequence number 1 of RRU1 and RRU0, sequence number 1 correspondence be fault warning control word position 1, RRU0 is set to 1 by the position 1 of the fault warning control word receiving in step S45 so, other bits (position 0 and position 2) are all set to 0, obtain fault warning control word 010.
S409, RRU0 send to BBU0 by fault warning control word.
S410, BBU0 receive by the rx termination of bbu_p1 light mouth the fault warning control word that RRU0 sends, the rx end of BBU0 by bbu_p1 light mouth detects between itself and RRU0 whether occur uplink optical fibers link failure (being whether the formed link of optical fiber B0 breaks down), if, enter step S412, if not, enter step S411.
Whether S411, RRU0 there is downlink optical fiber link failure (being whether the formed link of optical fiber A0 breaks down) between the rx end of Slave light mouth detects itself and BBU0, if so, enter step S412, if not, enter step S413.
S412, BBU0 are according to the corresponding relation of bit and predetermined rank order in the fault warning control word of preserving in the predetermined rank order of RRU0 (start sequence number in other words) and BBU0, find out in the fault warning control word receiving in step S409 and this sequence number corresponding bits position, by this corresponding bits position, be 1, by other bit positions of this fault warning control word, be 0, enter step S413.
Concrete, because the predetermined rank order of RRU0 is 0, in the fault warning control word of preserving in BBU0 in the corresponding relation of bit and predetermined rank order, sequence number 0 correspondence be position 0, therefore, BBU0 0 is set to 1 by the position of the fault warning control word receiving in step S409, other bits (position 1 and position 2) are all set to 0, obtaining fault warning control word 001, from fault warning control word 001, is that predetermined rank order is that optical fiber link fault has appearred in that one-level RRU of 0.
S413, BBU0 can identify fault point according to the corresponding relation of bit and predetermined rank order in the fault warning control word of preserving in this fault warning control word and BBU0, such as: if fault warning control word is 001, what in fault warning control word, the known position 0 of the corresponding relation of bit and predetermined rank order was corresponding is sequence number 0, hence one can see that, is that predetermined rank order is that optical fiber link fault has appearred in 0 RRU0; If fault warning control word is 010, what in fault warning control word, the known position 1 of the corresponding relation of bit and predetermined rank order was corresponding is sequence number 1, and hence one can see that, is that predetermined rank order is that optical fiber link fault has appearred in 1 RRU1.
In another embodiment, step S409 to S412 can take following manner to substitute: whether RRU0 occurs downlink optical fiber link failure (being whether the formed link of optical fiber A0 breaks down) between the rx end of Slave light mouth detects itself and BBU0, if, RRU0 is according to the corresponding relation of bit and predetermined rank order in the fault warning control word of preserving in self actual sequence number and BBU0, by the corresponding bits position of the fault warning control word finally obtaining in step S408, be 1, contrary is 0 by other bit positions of this fault warning control word, again fault warning control word is sent to BBU0.
The present invention also provides a kind of Remote Radio Unit, this Remote Radio Unit is by any in a plurality of Remote Radio Unit of optical fiber and baseband processing unit cascade, the Remote Radio Unit of baseband processing unit and the plurality of cascade forms uplink optical fibers link and the downlink optical fiber link of signal transmission, wherein, downlink optical fiber link refers to signal and transfers to described Remote Radio Unit by baseband processing unit or adjacent upper level Remote Radio Unit, or transfer to adjacent next stage Remote Radio Unit by described Remote Radio Unit, uplink optical fibers link refers to signal and by described Remote Radio Unit, is transferred to upper level Remote Radio Unit or the baseband processing unit being adjacent, or transfer to described Remote Radio Unit by adjacent next stage Remote Radio Unit, as shown in Figure 5, Remote Radio Unit 5 provided by the invention comprises: downlink optical fiber link failure detection unit 51, self actual sequence number acquiring unit 52, sequence number computing unit 53, fault warning control word reset cell 54, fault warning transmitting element 55 and fault warning receiving element 56, wherein,
Downlink optical fiber link failure detection unit 51 is adjacent between upper level Remote Radio Unit or baseband processing unit, whether to occur downlink optical fiber link failure for detection of this Remote Radio Unit 5;
Fault warning transmitting element 55 is for by the detected downlink optical fiber link failure in downlink optical fiber link failure detection unit 51, and fault warning control word sends to this upper level Remote Radio Unit or baseband processing unit;
Fault warning receiving element 56 is for receiving the downlink optical fiber link failure between detected this Remote Radio Unit 5 of adjacent next stage Remote Radio Unit and this next stage Remote Radio Unit; Also for receiving the fault warning control word that is sent to step by step this Remote Radio Unit 5 by afterbody Remote Radio Unit;
Self actual sequence number acquiring unit 52 obtains self actual sequence number by downlink optical fiber link;
Sequence number computing unit 53 is for adding the sequence number of its next stage Remote Radio Unit of 1 calculating according to the actual sequence number of this Remote Radio Unit 5 self;
The sequence number of this next stage Remote Radio Unit that fault warning control word reset cell 54 calculates for basis and default fault warning control word bit and the corresponding relation of predetermined rank order, the corresponding bits position of the fault warning control word that this fault warning receiving element 56 is received is 1 or 0, is 0 or 1 on the contrary by other bit positions of this fault warning control word.
Further, if this Remote Radio Unit 5 is the first order Remote Radio Unit adjacent with baseband processing unit, this fault warning control word reset cell 54 is also for according to self actual sequence number and this corresponding relation of this first order Remote Radio Unit, by the corresponding bits position of fault warning control word, being 1 or 0, is 0 or 1 by other bit positions of this fault warning control word on the contrary.
Further, this Remote Radio Unit 5 also comprises uplink optical fibers link failure detection unit 57, for detection of this Remote Radio Unit 5, is adjacent between next stage Remote Radio Unit, whether to occur uplink optical fibers link failure.
The present invention also provides a kind of wireless communication system, comprising: the Remote Radio Unit of baseband processing unit and a plurality of cascades, and this Remote Radio Unit is shown in above-mentioned Fig. 5; This baseband processing unit is for sending start sequence number by downlink optical fiber chain road direction the first Remote Radio Unit, also with receiving the fault warning control word transmitting step by step through each Remote Radio Unit.
Further, if there is descending and/or uplink optical fibers link failure between first order Remote Radio Unit and baseband processing unit, baseband processing unit is also for according to the default sequence number of first order Remote Radio Unit and default fault warning control word bit and the corresponding relation of default sequence number, by the corresponding bits position of fault warning control word, being 1 or 0, is 0 or 1 by other bit positions of described fault warning control word on the contrary.
Further, baseband processing unit also for detection of and described first order Remote Radio Unit between whether there is uplink optical fibers link failure.
The present invention is applicable to any networking mode between BBU and RRU, as star-like, chain, looped network and two BBU backup etc.Because RRU and BBU are cascade connections, the downlink optical fiber link of certain one-level RRU breaks down, and this grade of RRU all RRU below cannot normally work, so for user, needing most what be concerned about and determine is from the nearest fault point of BBU.In the present invention, if there is downlink optical fiber link failure between RRU at the corresponding levels and adjacent upper level RRU, self actual sequence number of RRU at the corresponding levels will be set to start sequence number, but, the sequence number of this upper level RRU is not subject to the impact of this fault, therefore, the sequence number that adds 1 these corresponding levels RRU calculating according to self actual sequence number of this upper level RRU is reset the method for fault warning control word than prior art, has improved accuracy; If this upper level RRU and also occurred again downlink optical fiber link failure between upper level RRU, cause self actual sequence number of this upper level RRU not also to be inconsistent with its predetermined rank order, so by this upper level RRU replacement to fault warning control word again, make finally to report in the fault warning control word of BBU, only embody from the position of the nearest downlink optical fiber link failure of BBU.
Above content is in conjunction with concrete execution mode further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. a method for Remote Radio Unit reporting links fault, described baseband processing unit, by optical fiber and a plurality of Remote Radio Unit cascade, forms uplink optical fibers link and the downlink optical fiber link of signal transmission; Wherein, downlink optical fiber link refers to signal and by baseband processing unit, is transferred to the first order Remote Radio Unit being adjacent, or from Remote Radio Unit at the corresponding levels, transfers to the next stage Remote Radio Unit being adjacent; Uplink optical fibers link refers to signal and by Remote Radio Unit at the corresponding levels, is transferred to the upper level Remote Radio Unit being adjacent, or transfers to baseband processing unit by first order Remote Radio Unit, it is characterized in that, the method comprises the following steps:
Step 1, Remote Radio Unit at the corresponding levels detect between itself and adjacent upper level Remote Radio Unit whether occur downlink optical fiber link failure, described upper level Remote Radio Unit detects between itself and described Remote Radio Unit at the corresponding levels whether occur uplink optical fibers link failure, if there is one to break down in both, enter step 2, if both all do not break down, enter and enter step 3;
Step 2, described upper level Remote Radio Unit obtain self actual sequence number by downlink optical fiber link, add the sequence number of the described Remote Radio Unit at the corresponding levels of 1 calculating according to self actual sequence number; According to the corresponding relation of bit and predetermined rank order in the sequence number of the described Remote Radio Unit at the corresponding levels obtaining and default fault warning control word, by the corresponding bits position that is sent to step by step the fault warning control word of described upper level Remote Radio Unit by afterbody Remote Radio Unit, be 1 or 0, contrary is 0 or 1 by other bit positions of described fault warning control word, enters and enters step 3;
Step 3, described upper level Remote Radio Unit send to the again upper level Remote Radio Unit adjacent with described upper level Remote Radio Unit by fault warning control word, return to step 1;
Step 4 is until first order Remote Radio Unit detects between itself and baseband processing unit whether occur downlink optical fiber link failure, described baseband processing unit detects between itself and described first order Remote Radio Unit whether occur uplink optical fibers link failure, if both all do not break down, first order Remote Radio Unit reports baseband processing unit by fault warning control word.
2. the method for Remote Radio Unit reporting links fault as claimed in claim 1, it is characterized in that, in step 4, if there is descending and/or uplink optical fibers link failure between first order Remote Radio Unit and baseband processing unit, after first order Remote Radio Unit reports baseband processing unit by fault warning control word, also comprise: described baseband processing unit is according to the predetermined rank order of described first order Remote Radio Unit and described corresponding relation, by the corresponding bits position of fault warning control word, be 1 or 0, contrary is 0 or 1 by other bit positions of described fault warning control word.
3. the method for Remote Radio Unit reporting links fault as claimed in claim 1, it is characterized in that, in step 4, if there is downlink optical fiber link failure between first order Remote Radio Unit and baseband processing unit, before first order Remote Radio Unit reports baseband processing unit by fault warning control word, also comprise: first order Remote Radio Unit is according to self actual sequence number and described corresponding relation, by the corresponding bits position of described fault warning control word, being 1 or 0, is 0 or 1 by other bit positions of described fault warning control word on the contrary.
4. the method for the Remote Radio Unit reporting links fault as described in claims 1 to 3 any one, it is characterized in that, step 1 is specially: described upper level Remote Radio Unit detects between itself and described Remote Radio Unit at the corresponding levels whether occur uplink optical fibers link failure, if so, enter step 2; If not, described Remote Radio Unit at the corresponding levels detects between itself and described upper level Remote Radio Unit whether occur downlink optical fiber link failure; If so, detected described downlink optical fiber link failure is sent to described upper level Remote Radio Unit, enter step 2.
5. a Remote Radio Unit, described Remote Radio Unit is by any in a plurality of Remote Radio Unit of optical fiber and baseband processing unit cascade, described baseband processing unit and described a plurality of Remote Radio Unit form uplink optical fibers link and the downlink optical fiber link of signal transmission, wherein, downlink optical fiber link refers to signal and transfers to described Remote Radio Unit by baseband processing unit or adjacent upper level Remote Radio Unit, or transfer to adjacent next stage Remote Radio Unit by described Remote Radio Unit, uplink optical fibers link refers to signal and by described Remote Radio Unit, is transferred to upper level Remote Radio Unit or the baseband processing unit being adjacent, or transfer to described Remote Radio Unit by adjacent next stage Remote Radio Unit, it is characterized in that, described Remote Radio Unit comprises: downlink optical fiber link failure detection unit, self actual sequence number acquiring unit, sequence number computing unit, fault warning control word reset cell, fault warning transmitting element and fault warning receiving element, wherein,
Described downlink optical fiber link failure detection unit is adjacent between upper level Remote Radio Unit or baseband processing unit, whether to occur downlink optical fiber link failure for detection of described Remote Radio Unit;
The downlink optical fiber link failure of described fault warning transmitting element for described downlink optical fiber link failure detection unit inspection is gone out, and fault warning control word sends to described upper level Remote Radio Unit or baseband processing unit;
Described fault warning receiving element is for receiving the downlink optical fiber link failure between the detected described Remote Radio Unit of adjacent next stage Remote Radio Unit and described next stage Remote Radio Unit; Also for receiving the fault warning control word that is sent to step by step described Remote Radio Unit by afterbody Remote Radio Unit;
Described self actual sequence number acquiring unit is for obtaining self actual sequence number by downlink optical fiber link;
Described sequence number computing unit is for adding the sequence number of the described next stage Remote Radio Unit of 1 calculating according to the actual sequence number of described Remote Radio Unit self;
The sequence number of the described next stage Remote Radio Unit that described fault warning control word reset cell calculates for basis and default fault warning control word bit and the corresponding relation of predetermined rank order, the corresponding bits position of the fault warning control word that described fault warning receiving element is received is 1 or 0, is 0 or 1 on the contrary by other bit positions of described fault warning control word.
6. Remote Radio Unit as claimed in claim 5, it is characterized in that, if described Remote Radio Unit is the first order Remote Radio Unit adjacent with described baseband processing unit, described fault warning control word reset cell is also for according to self actual sequence number and described corresponding relation of described first order Remote Radio Unit, by the corresponding bits position of described fault warning control word, being 1 or 0, is 0 or 1 by other bit positions of described fault warning control word on the contrary.
7. the Remote Radio Unit as described in claim 5 or 6, it is characterized in that, described Remote Radio Unit also comprises uplink optical fibers link failure detection unit, and described uplink optical fibers link failure detection unit is adjacent between next stage Remote Radio Unit, whether to occur uplink optical fibers link failure for detection of described Remote Radio Unit.
8. a wireless communication system, is characterized in that, comprising: the Remote Radio Unit of baseband processing unit and a plurality of cascades; Described Remote Radio Unit is the Remote Radio Unit as described in claim 5 to 7 any one; Described baseband processing unit is for sending start sequence number by downlink optical fiber chain road direction the first Remote Radio Unit, also with receiving the fault warning control word transmitting step by step through each Remote Radio Unit.
9. wireless communication system as claimed in claim 8, it is characterized in that, if there is descending and/or uplink optical fibers link failure between first order Remote Radio Unit and baseband processing unit, described baseband processing unit is also for according to the default sequence number of first order Remote Radio Unit and default fault warning control word bit and the corresponding relation of default sequence number, by the corresponding bits position of fault warning control word, being 1 or 0, is 0 or 1 by other bit positions of described fault warning control word on the contrary.
10. wireless communication system as claimed in claim 9, is characterized in that, described baseband processing unit also for detection of and described first order Remote Radio Unit between whether there is uplink optical fibers link failure.
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