CN1094707C - Network synchronous device - Google Patents
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- CN1094707C CN1094707C CN98104238A CN98104238A CN1094707C CN 1094707 C CN1094707 C CN 1094707C CN 98104238 A CN98104238 A CN 98104238A CN 98104238 A CN98104238 A CN 98104238A CN 1094707 C CN1094707 C CN 1094707C
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Abstract
When transmission quality of a digital signal sent through an active channel 4 has been deteriorated, a control information transmission control means 10 decides a standby channel 5 to be the channel to send control information, the transmission of the control information by the channel 5 is realized and a clock reference channel decision means 9 decides the channel 5 to be a channel to be selected by a synchronization clock distribution means 6.. In the case that a fault of unarrival of a digital signal at all takes place in the active channel 4, the clock reference channel decision means 9 decides the channel 5 to be a channel to be selected by the synchronization clock distribution means 6, and the control information transmission control means 10 decides the channel 5 to be a channel through which the control information is to be sent so as to realize the transmission of the control information by the channel 5.
Description
The present invention relates to network synchronous device, particularly relate at least the network that is connected with public network by two digital circuits network synchronous device with the public network synchronous working.
Particularly from reduction construct user network total cost, shorten viewpoints such as constructing required time, constantly development of the variation of access network system in recent years.Access network system comprises long-range line concentrator, light multiplexing unit of switch etc.
Along with the development of mobile communication technology, adopt access network system WLL (the Wireless Local Loop: wireless user's circuit) receive publicity of radiolink.WLL changes local loop the wireless subscriber's line of simplifying into and lays from wired, and engineering provides the system of telephone service rapidly to the user.The system that same idea was also once arranged in the past, but because such system price is too expensive, the emergency measures when only being used for lonely and remote area and disaster taking place.But in the last few years along with the progress of cellular telephony, price descends to some extent, also begins to have occurred planning to provide with WLL the communication enterprise of service in the city.
Figure 13 is existing access network key diagram.That is, in public network PSTN (Public SwitchedTelephone Network) 101, comprise subscriber exchange LE (Local Exchange) 102, on LE102, connect to get and deposit network A N103.On AN103, connect a plurality of user terminals, for example phone TEL.
Figure 14 is the inside composition diagram of AN103.Comprised WLL in the composition of this AN103, AN103 is made up of the control device BSC of radio base office (Base Station Controller) 111, the BTS of radio base office (Base Transceiver Station) 112,113, user's set SU (Subscriber Unit) 114 ~ 117 and OAM control device OMC-R (Operation andMaintenance Controller-Radio) 118.BSC111 has function of exchange functions such as (call-handling capabilitys), also can have authentication function in case of necessity.BTS112,113 carries out operations such as radio communication control as the interface between BSC111 and radio zone.SU114～117 are between radio zone and the interface of user terminal.OMC-R118 has BSC111, BTS112,113, the maintenance of SU114～117, operating function.
Figure 15 is provided in a side of the line map between AN103 and the LE102.Between AN103 and LE102, use the V5.1 interface or the V5.2 interface of ITU-T (International Telecommunication Unit-Telecommunication Sector) regulation, but the situation of expression use V5.2 interface among Figure 15.
In the V5.1 interface, when transmitting main information (call-information), also only manage the control information of this circuit with this circuit transmission by the ZMbps physical circuit.Therefore in the access network system that comprises unnecessary ZMbps circuit, the ZMbps circuit has the relation of complete equity each other.
And be to manage many ZMbps circuits with wire harness to the V5.2 interface, manage that the control information of many ZMbps circuit wire harness transmitted by the part of a ZMbps circuit.Wire harness is minimum by 3 circuits, be made up of 16 circuits at most.In this many circuits, 2 transmission that are used for control information.That is, a middle control information transmission in first order circuit 121 and second level circuit 122 is when this circuit takes place when unusual again by another circuit control information transmission.Though a part of control information (having only " protection " signal in the layer 3 following among Fig. 3) is by the 1st grade of circuit 121 and 122 two transmission of the 2nd grade of circuit, other are all only by a circuit transmission.Other 123,124 circuits are specifically designed to the main information of transmission.In addition, the 1st grade of circuit 121 and the 2nd grade of circuit 122 also are used to transmit main information except control information transmission.
, each device of forming AN103 all must be according to the master sync signal work of the clock signal synchronised of using with PSTN101.Therefore, in AN103 normally: the digital signal of sending based on LE102, produce the master clock signal with the employed clock signal synchronised of PSTN101, supply with each device of forming AN103.
In the past when breaking down in the control information transmission, by the back-up circuit in 1 grade of circuit 121 of V5.2 interface conversion to the and the 2nd grade of circuit 122, control information can continue transmission.As shown in figure 16.
Figure 16 is the conversion sequence figure during control signals transmitted generation transmission fault between AN103 and LE102.Active line road in Figure 16 in the 1st grade of circuit 121 of supposition and the 2nd grade of circuit 122 is circuit A, and the back-up circuit is circuit B.
When LE102 detects (S101) when breaking down on the circuit A, then between the BSC111 of LE102 and AN103, carry out the information exchange (S102) of control information conversion.Here the fault of Fa Shenging not is the fault that does not have digital signal fully, but the transmission quality of digital signal is worsened, must frequently send the control letter the fault of re-send request may.Therefore, in AN103,, do not break down in the synchronizing regeneration of clock even when carrying out clock regeneration according to the digital signal of circuit A transmission.
Owing to produced this fault, will carry out control information is shifted to circuit B from circuit A the processing of transmission.At first, carry out the information exchange (S102) of control information conversion, then, the whole control informations except " protection " of layer 3 are set up the link (S103) of layer 2 on circuit B.
Partly carry out maintenance operation for repair a breakdown then, under the frame upper plate during hardware relevant with circuit A (S104), digital signal is sent fully less than AN103 in LE102.Therefore, AN103 changes and makes it to obtain the digital signal used for clock regeneration from circuit B, will change the resulting new master clock signal in back again and be transferred to each several part (S105) in the AN103.
But, the control information transmission that has been transformed on the circuit B is caused confusion owing to changed new master clock signal.
When disengagement failure appearred in circuit A, the V5.2 interface was transformed on the back-up circuit B of control information by processing sequence shown in Figure 17.
Control information translation precedence diagram when Figure 17 does not reach the such fault of AN103 for produce the digital signal of being transmitted by active line road A between AN103 and LE102.
When AN103 detects (S111) when not having the clock failure of digital signal fully by circuit A, then change making it to obtain the digital signal that clock regeneration is used from circuit B, the resulting master clock signal in conversion back is transferred to the each several part (S112) in the AN103.
Therefore AN103 sends the retry signal by V5.2 repeatedly owing to the control information that does not obtain sending from circuit A, and can judge on the circuit A after reaching the retry of stipulated number has fault.Between the BSC111 of LE102 and AN103, carry out the information exchange (S114) of control information conversion then, the whole control informations except " protection " of layer 3 are set up the link (S115) of layer 2 on circuit B.
Like this, although existing method can obtain based on the new master clock signal from the digital signal of circuit B, if without the retry of stipulated number, control information just may not changed to circuit B.
In view of this situation, the object of the present invention is to provide a kind of like this access network synchronizer: even when breaking down on the circuit of control information transmission, still can realize the transmission of high reliability to control information.
In order to achieve the above object, the invention provides a kind of network synchronous device as shown in Figure 1, it makes at least the network 2 that is connected with public network 1 by two digital circuits with public network 1 synchronous working.
This network synchronous device is made up of following apparatus:
Clock abnormal detector 7 monitors by the 1st circuit 4 and the 2nd each digital signal that circuit 5 is transmitted, and detects the state of clock;
The clock reference circuit is determined device 9, the state of the clock signal that detects according to clock abnormal detector 7 and worsen the degradation mode of the transmission quality that checkout gear 8 detects is determined the circuits that synchronised clock distributors 6 should be selected in the middle of the 1st circuit 4 and the 2nd circuit 5; And
The control device 10 of control information transmission, the clock status that detects according to clock abnormal detector 7 and worsen the degradation mode of the transmission quality that checkout gear 8 detects, in the middle of the 1st circuit 4 and the 2nd circuit 5, determine to answer the circuit of control information transmission, and by determined circuit control information transmission.
Also can comprise: external command is determined line unit, is used for when changing the circuit of answering control information transmission by force, the circuit that will change in the above-mentioned the 1st and the 2nd circuit being defined as the circuit that above-mentioned synchronised clock distributor should be selected by the input external command.
In above-mentioned composition, suppose that the 1st circuit 4 is the active line road, the 2nd circuit 5 is the back-up circuit.That is, the digital signal of transmitting in the 1st circuit 4 is input to synchronised clock distributor 6, the clock signal of the clock synchronised of generation and this digital signal, and distribute to and form respectively installing of network 2.The control device 10 of control information transmission is used to be implemented in the 1st control information transmission on the circuit 4.
Suppose and on the 1st circuit 4, taken place unusually.According to the degree difference, circuit is divided into two kinds unusually substantially.First kind what refer to unusually is not the fault that does not have digital signal such fully, but the transmission quality of digital signal worsens, and must frequently send the unusual of re-send request may.Second kind is meant there be not the unusual of digital signal when cutting off as circuit fully unusually.First kind is detected by worsening checkout gear 8 unusually, and second kind of unusual clock abnormal detector 7 that passes through detects.
The clock reference circuit determines that the control device 10 of device 9 and control information transmission will carry out suitable work with second kind of unusual situation occurred unusually according to first kind.For example, take place first kind when unusual on the 1st circuit 4, the control device 10 of control information transmission is defined as answering the circuit of control information transmission with the 2nd circuit 5, realizes the transmission of control informations by second circuit 5.Meanwhile, the clock reference circuit determines that device 9 is defined as the circuit that synchronised clock distributor 6 should be selected with the 2nd circuit 5.That is, take place first kind when unusual,, even without breaking down, also will transform on the clock regeneration that produces according to the 2nd digital signal that circuit 5 is transmitted in the clock synchronization regeneration even continue that according to the 1st digital signal that circuit 4 is transmitted clock regeneration is arranged.
Like this, the master clock conversion among Figure 16 shown in the step S105 will be carried out before execution in step S103, thereby just can avoid being transformed into this existing issue of confusion that the control information on the back-up circuit B is caused because of the master clock conversion in transmission.
Suppose to take place second kind unusually on the 1st circuit 4, the clock reference circuit determines that device 9 is defined as the circuit that synchronised clock distributor 6 should be selected with the 2nd circuit 5 so.Meanwhile, the control device 10 of control information transmission is defined as answering the circuit of control information transmission with the 2nd circuit 5, is realized the transmission of control informations by the 2nd circuit 5.That is, take place second kind when unusual, transform in the nature of things on the clock regeneration that produces according to the 2nd digital signal that circuit 5 is transmitted.Meanwhile, the control device 10 of control information transmission is just realized the transmission of control information at once with the 2nd circuit 5.
Like this, the conversion process of control information shown in step S114 and the step S115 is carried out after step S112 carries out at once among Figure 17, therefore just eliminated to sending the stipulated number needed stand-by period of retry, the conversion process of control information can be carried out rapidly.
Thereby,, still can realize the transmission of high reliability to control information even in the circuit of control information transmission, break down.
Brief Description Of Drawings
Fig. 1 is a principle key diagram of the present invention.
Fig. 2 is the inside composition diagram of the control device BSC of radio base office among first embodiment.
Fig. 3 is the protocol level composition diagram of V5.2 interface.
Fig. 4 is the inside composition diagram of the hardware control unit shown in Fig. 2.
Fig. 5 is the selection logic of clock signal composition (clock A, clock B) of clock selecting logical block and the selection logic that L3/ uses the control information transmission line of processing unit.
Fig. 6 is the conversion sequence figure of the present invention when in the control signals transmitted transmission fault taking place between control device BSC of radio base office and the subscriber exchange LE.
Fig. 7 is the control information conversion sequence figure of the present invention when taking place not arrive the fault of the control device BSC of radio base office by the digital signal that the active line road is transmitted between control device BSC of radio base office and subscriber exchange LE.
Fig. 8 is that hardware control unit and L3/ used the operation flow sheet of processing unit when input required the conversion command of control information transmission line conversion among the subscriber exchange LE.
Fig. 9 is that hardware control unit and L3/ used the operation flow sheet of processing unit when input required the conversion command of control information transmission line conversion among the access network AN (the control device BSC of radio base office).
Figure 10 is among the control device BSC of radio base office in access network AN, and the L2 processing unit detects the L2 link when disconnected, and hardware control unit and L3/ use the operation flow sheet of processing unit.
Figure 11 is that the inside of the control device BSC of radio base office among second embodiment is formed.
Figure 12 is the inside composition diagram of hardware control unit.
Figure 13 is the key diagram of existing access network
Figure 14 is that the inside of AN is formed.
Figure 15 is the circuit of installing between AN and the LE.
Figure 16 is the conversion sequence when in the control signals transmitted transmission fault taking place between AN and LE.
Figure 17 is the conversion sequence of control information when taking place not arrive the fault of AN by the digital signal that active line road A is transmitted between AN and LE.
Below, embodiments of the present invention are described with reference to the accompanying drawings.
At first, the principle composition that relates to first embodiment of network synchronous device of the present invention with reference to figure 1 explanation.First embodiment is by forming with the lower part:
Clock abnormal detector 7 monitors by the 1st circuit 4 and the 2nd each digital signal that circuit 5 is transmitted, and detects the state of clock;
The clock reference circuit is determined device 9, the state of the clock signal that detects according to clock abnormal detector 7 and worsen the degradation mode of the transmission quality that checkout gear 8 detects is determined the circuits that synchronised clock distributors 6 should be selected in the middle of the 1st circuit 4 and the 2nd circuit 5; And
The control device 10 of control information transmission, the clock status that detects according to clock abnormal detector 7 and worsen the degradation mode of the transmission quality that checkout gear 8 detects, in the middle of the 1st circuit 4 and the 2nd circuit 5, determine to answer the circuit of control information transmission, and by determined circuit control information transmission.
In above-mentioned composition, suppose that the 1st circuit 4 is the active line road, the 2nd circuit 5 is the back-up circuit.That is, the digital signal of transmitting in the 1st circuit 4 is input to synchronised clock distributor 6, the clock signal of the clock synchronised of generation and this digital signal, and distribute to and form respectively installing of network 2.Control information transmission control device 10 is used to be implemented in the transmission of carrying out control information on the 1st circuit 4.
Suppose and on the 1st circuit 4, taken place unusually.According to the degree difference, circuit is divided into two kinds unusually substantially.First kind what refer to unusually is not the fault that does not have digital signal such fully, but the transmission quality of digital signal worsens, and must frequently send the unusual of re-send request may.Second kind is meant there be not the unusual of digital signal when cutting off as circuit fully unusually.First kind is detected by worsening checkout gear 8 unusually, and second kind of unusual clock abnormal detector 7 that passes through detects.
The clock reference circuit determines that device 9 and control information transmission control device 10 will carry out suitable work with second kind of unusual situation occurred unusually according to first kind.For example, take place first kind when unusual on the 1st circuit 4, control information transmission control device 10 is defined as answering the circuit of control information transmission with the 2nd circuit 5, realizes the transmission of control informations by the 2nd circuit 5.Meanwhile, the clock reference circuit determines that device 9 is defined as the circuit that synchronised clock distributor 6 should be selected with the 2nd circuit 5.That is, take place first kind when unusual,, even without breaking down, also will transform on the clock regeneration that produces according to the 2nd digital signal that circuit 5 is transmitted in the clock synchronization regeneration even continue that according to the 1st digital signal that circuit 4 is transmitted clock regeneration is arranged.
Like this, the conversion of master clock among Figure 16 shown in the step S105 will be carried out before execution in step S103, thus just can avoid being transformed into control information on the back-up circuit B in transmission because of master clock conversion this existing issue that causes confusion.
Suppose on the 1st circuit 4 to take place second kind when unusual, the clock reference circuit determines that device 9 is defined as the circuit that synchronised clock distributor 6 should be selected with the 2nd circuit 5.Meanwhile, control information transmission control device 10 is defined as the circuit of control information transmission with the 2nd circuit 5, is realized the transmission of control informations by the 2nd circuit 5.That is, take place second kind when unusual, transform in the nature of things on the clock regeneration that produces according to the 2nd digital signal that circuit 5 is transmitted.Meanwhile, control information transmission control device 10 is just realized the transmission of control information at once with second circuit 5.
Like this, the conversion process of the control information shown in step S114 and the step S115 is carried out after step S112 carries out at once among Figure 17, therefore just eliminated to sending the stipulated number needed stand-by period of retry, the conversion process of control information can be carried out rapidly.
Thereby,, still can realize the transmission of high reliability to control information even in the circuit of control information transmission, break down.
Below first kind of execution mode specified.In first kind of execution mode, the outside of access network is formed and is innerly formed with the composition of Figure 13～shown in Figure 15 basic identically, so these explanations are omitted, and only the different control device BSC of radio base office is formed in explanation.
Shown in Figure 2 is the inside composition diagram of the control device BSC of radio base office among first embodiment.Second embodiment promptly installs 16 (only drawing among Fig. 2 3) 2Mbps circuits between subscriber exchange LE and the control device BSC of radio base office, these circuits are connected with multichannel unit (MUX) 11.The signal of 11 pairs of each circuit transmission in multichannel unit (MUX) carries out being transferred to switch element (SW) 12 after multichannel is handled.12 pairs of main information of switch element (SW) carry out being transferred to separative element (DMX) 13 after the exchange between time slot, take out control information simultaneously and are transferred to L2 processing unit 16.Separative element (DMX) 13 is isolated the each several part that main information outputs to the BTS of radio base office.Multichannel unit (MUX) 14, switch element (SW) 12, separative element (DMX) 15 carry out the anti-operation of aforesaid operations.
The protocol processes of the layer 2 in the V5.2 interface is carried out in 16 pairs of control informations of L2 processing unit.Conversion between the PSTN interface (agreement) that L3/ application processing unit 17 carries out using based on the interface of the ISDN of the BTS of radio base office end use and subscriber exchange LE end, and carry out comprehensive control of the control device BSC of radio base office.L3/ uses the transmission quality that processing unit 17 is checked control informations in addition, is that basic selection should be carried out the circuit that control information is transmitted with the stateless of this link information and following clock signal from hardware control unit 20 inputs (A is disconnected, B disconnected) information when exporting to hardware control unit 20 as link information.Carry out time slot then and set, so that the circuit control information transmission of the enough selections of energy.This content will describe in detail in the back.
Two in 16 2Mbps circuits installing between subscriber exchange LE and the control device BSC of radio base office are used for control information transmission.Be separately installed with Clock Extraction unit 18,19 on these two circuits. Clock Extraction unit 18,19 takes out clock signal composition (clock A, clock B) respectively from each digital signal that subscriber exchange LE transmission comes on these two circuits, send to hardware control unit 20.Hardware control unit 20 serves as that the stateless (A is disconnected, B breaks) that the basis detects clock signal respectively is transferred to L3/ application processing unit 17 with the signal of these transmission.Simultaneously, hardware control unit 20 is used the link information that processing unit 17 transmission come based on the stateless (A is disconnected, B breaks) of this clock signal and by L3/, select in two clock signal compositions (clock A, clock B), carry out clock regeneration according to the clock signal composition of selecting, send each device of forming the radio base control device BSC of office as master clock to.To describe in detail for hardware control unit 20 back.
L3/ uses processing unit 17, hardware control unit 20 is made up of message handler respectively.L3/ uses processing unit 17 and is equivalent to deterioration checkout gear 8 among Fig. 1, and switch element (SW) 12, L2 processing unit 16, worsens checkout gear 8 and be equivalent to control information transmission control device 10 among Fig. 1.
Shown in Figure 3 is the protocol level composition diagram of V5.2 interface.Particularly point out, layer 3 (L3) have represented to form each cell of control information, each cell that comprises in " PSTN " hurdle, " L-C " hurdle, " CTRL " hurdle and " BCC " hurdle only transmits in the active line road, has only the cell that comprises in " Pr " hurdle all to transmit in active line road and back-up circuit.The processing of PSTN agreement is represented on " PSTN " hurdle, the state of announcement trunk (on-hook, off-hook).The physical transformation control of the control information that order that the request of sending according to access network and monitor-control apparatus (Operation System) send is carried out is represented on " Pr " hurdle.Each circuit link control of 16 circuits is represented on " L-C " hurdle." BCC " hurdle is represented the setting that connects between the time slot of the access network user port that carries out according to the order of access network being sent from subscriber exchange LE and V5.2 interface and is removed relevant Bearer Channel and control.
Fig. 4 is that the inside of hardware control unit 20 shown in Figure 2 is formed.That is, the clock signal compositions (clock A, clock B) that 18,19 transmission come from the Clock Extraction unit are input to selector (SEL) 31, also are input to the disconnected detecting unit 32,33 of clock respectively simultaneously.The disconnected detecting unit 32,33 of clock is not transferred to clock selecting logical block 34 respectively with the disconnected detection signal of clock (A is disconnected, B breaks) when having the clock signal composition, be transferred to L3/ simultaneously yet and use processing unit 17.In clock selecting logical block 34, in addition also has the link information of using the next expression control information transmission quality of processing unit 17 transmission from L3/.Clock selecting logical block 34 is selected one according to disconnected detection signal of this clock (A is disconnected, B breaks) and link information from two clock information compositions (clock A, clock B), its selection logic will be with reference to figure 5 explanation below.
Fig. 5 is the selection logic of the clock signal composition (clock A, clock B) in the clock selecting logical block 34, has also represented to use at L3/ the selection logic of the control information transmission line in the processing unit 17 simultaneously.C1 represents on the hurdle difference according to the disconnected detection signal of clock (A is disconnected, B disconnected), and the clock status of each bar circuit, O mark represent not have the clock detection signal (clock is normal) that break, and the X label table is shown with the disconnected detection signal of clock (clock breaks).A, B represent circuit.C2 represents on the hurdle that O represents that the transmission quality of control information is normal according to the control information transmission quality of each bar circuit of difference of link information, and X represents that the transmission quality of control information is unusual.The C3 hurdle is illustrated under the state shown in C1 hurdle and the C2 hurdle, selects some from clock signal composition (clock A, clock B).One of selecting in the past of " preceding maintenance " expression remains unchanged, and the yet non-selected clock B of clock A had not both been selected in " voluntarily " (freedom) expression, but selects following from the clock of clock generator 35 voluntarily.The C4 hurdle is to use the relevant part of processing unit 17 with L3/, will be explained below.
Return Fig. 4 again, clock selecting logical block 34g exports to selector 31 with one of signal of above-mentioned expression " A ", " B ", " preceding maintenance ", " voluntarily ".In selector 31, except clock signal composition (clock A, clock B), also have from the clock signal of clock generator 35 inputs voluntarily.Clock generator 35 takes place with clock signal step inequality of subscriber exchange LE use but identical clock signal of cycle voluntarily.
When selector 31 receives the signal of expression " A ", just select clock signal composition and be transferred to PLL circuit 36 from circuit A, equally, when receiving the signal of expression " B ", just select from circuit B next clock signal composition, when receiving the signal of expression " preceding maintenance ", just select from before the clock signal composition that comes of the circuit of selection, when receiving expression " voluntarily " signal, then select from the clock signal of clock generator 35 voluntarily and be transferred to PLL circuit 36.
Regeneration of PLL circuit and the clock signal of transmitting the signal Synchronization of coming are transferred to master clock distributor 37.The clock signal that master clock distributor 37 will be regenerated is distributed to each device of forming the radio base control device BSC of office.
Shown in the 2nd and the 3rd section of Fig. 5, the link that takes place on the circuit unusual (first kind unusual) is not the fault that does not have digital signal such fully, but the transmission quality of digital signal worsens, and must frequently send re-send request may.When circuit A or circuit B above-mentioned link take place when unusual, even continue that according to the digital signal that takes place to be transmitted on the unusual circuit clock regeneration is arranged, though do not break down in the clock synchronization regeneration, also to transform to according to the clock regeneration that the unusual digital signal that circuit the transmitted generation of link does not take place.
Like this, the conversion of master clock was just carried out before the link on the control information back-up circuit is set, thus just can avoid being transformed into control information on the back-up circuit in transmission because of master clock conversion this existing issue that causes confusion.Specify as shown in Figure 6.
Fig. 6 is conversion sequence figure of the present invention when in the control signals transmitted transmission fault taking place between control device BSC of radio base office and subscriber exchange LE.
When circuit A is the active line road, in circuit A, break down, when subscriber exchange LE detects discovery (S1), between the control device BSC of radio base office of subscriber exchange LE and access network AN, carry out the information exchange (S2) of conversion controling information.
Then, the control device BSC of radio base office changes immediately, so that obtain the digital signal that clock regeneration is used from back-up circuit B, the resulting new master clock signal in conversion back is transferred to the each several part (S3) in the control device BSC of radio base office.
After this, the layer of except " protection " of layer 3 all control informations being set up on the circuit B 2 links (S4).That is, form control information, a plurality of information units of setting respectively on the different time-gap position are set in respectively on the digital signal time slot corresponding position of being transmitted on the circuit B.
As mentioned above, L3/ among Fig. 2 uses stateless (A is disconnected, the B disconnected) Information Selection of the clock signal that processing unit 17 sends according to link information and hardware control unit 20 should carry out the circuit of control information transmission, sets time slot so that by selected circuit control information transmission.The selection logic of this circuit will describe with reference to figure 5.
In Fig. 5, the C4 hurdle is illustrated in the circuit of the control information transmission that L3/ application processing unit 17 should be selected under the state shown in C1 hurdle and the C2 hurdle.Circuit A is selected in " A " expression, and circuit B is selected in " B " expression, and one that selects before " preceding maintenance " represented remains unchanged.
Shown in the 5th section and the 9th section of Fig. 5, it is unusual to have sent out clock on circuit A or the circuit B, be that circuit seems to cut off, there is not digital signal fully, at this moment transform in the nature of things according on the clock regeneration that the unusual digital signal that circuit transmitted generation does not take place, meanwhile, at once by there not being unusual circuit to realize the transmission of control information.
Like this, the conversion process of control information is carried out after the master clock conversion immediately, thereby has eliminated as before for sending stipulated number needed stand-by period of retry, the conversion process of carrying out control information rapidly.Concrete condition as shown in Figure 7.
When Fig. 7 is illustrated between control device BSC of radio base office and the subscriber exchange LE digital signal that takes place to be transmitted on the active line road and does not arrive the fault of the control device BSC of radio base office, the conversion sequence of control information of the present invention.
Suppose that the active line road is circuit A, when the control device BSC of radio base office detects (S11) when not having the clock failure of digital signal fully by circuit A, then between subscriber exchange LE and the control device BSC of radio base office, to carry out the information exchange (S12) of conversion controling information.And, change, so that obtain the digital signal that clock regeneration is used, after the conversion resulting master clock signal is transferred to the each several part (S13) in the control device BSC of radio base office from circuit B.
Then, the control device BSC of radio base office sets up the link (S14) of layer 2 on circuit B to all control informations except that " protection " of layer 3.That is, form control information, a plurality of information units that are set in the different time-gap position respectively are set in the corresponding time slot position of digital signal that is transmitted with circuit B respectively.
The conversion of the control information transmission line that master clock conversion that hardware control unit 20 is carried out among Fig. 2 and L3/ application processing unit 17 are carried out also can be imported conversion command by the outside and carry out, and will describe with reference to figure 8 and Fig. 9 this.In addition, these conversions also can detect in L2 processing unit 16 when the L2 link is broken to be carried out, and will illustrate with reference to Figure 10 this.
Fig. 8 is illustrated among the subscriber exchange LE hardware control unit 20 of being carried out when input requires the conversion command of transmission line conversion of control information and operation flow sheet that L3/ uses processing unit 17.
That is, when subscriber exchange LE input conversion command (S21), between subscriber exchange LE and radio base control unit BSC, to carry out the information exchange (S22) of conversion controling information.Change so that the circuit after control information conversion obtains the digital signal that clock regeneration is used, after the conversion resulting new master clock signal is transferred to the interior each several part (S23) of the control device BSC of radio base office.
Then, the control device BSC of radio base office links (S24) to the layer 2 that all control informations all are based upon on the conversion line except that " protection " of layer 3.
Like this, even imported the conversion command of the transmission line conversion that requires control information, the conversion of master clock was also finished before the processing of execution in step S24.Thereby the confusion that is transformed into the control information transmission on the back-up circuit of keeping in repair, also changing master clock after having avoided the past conversion command to import again and produce therefrom.
When Fig. 9 was illustrated in the conversion command of importing the transmission line conversion that requires control information among the access network AN (the control device BSC of radio base office), hardware control unit 20 and L3/ used the action sequence diagram of processing unit 17.
That is, when importing conversion command among the control device BSC of radio base office (S26), between subscriber exchange LE and the control device BSC of radio base office, to carry out the information exchange (S27) of conversion controling information.And change so that the circuit after control information conversion obtains the digital signal that clock regeneration is used, after the conversion resulting new master clock signal is transferred to the interior each several part (S28) of the control device BSC of radio base office.
Then, the control device BSC of radio base office links (S29) to the layer 2 that all control informations all are based upon on the circuit of conversion back except that " protection " of layer 3.
Like this, even imported the conversion command of the transmission line conversion that requires control information, the conversion of master clock was finished before the processing of execution in step S29.Thereby, the same with situation shown in Figure 8, can avoid the confusion that is transformed into the control information transmission on the back-up circuit of keeping in repair, also changing master clock again and produce therefrom after the conversion command input.
Figure 10 is among the control device BSC of radio base office that is illustrated in the access network AN, L2 processing unit 16 detect the L2 link when disconnected hardware control unit 20 and L3/ use the operation flow sheet of processing unit 17.
That is,, between subscriber exchange LE and the control device BSC of radio base office, carry out the information exchange (S32) of conversion controling information when detecting L2 link among the control device BSC of radio base office when disconnected (S31).And, change, so that the circuit after the control information conversion obtains the digital signal that clock regeneration is used, the resulting new master clock signal in conversion back is transferred to the each several part (S33) in the control device BSC of radio base office.
Then, the control device BSC of radio base office links (S34) to the layer 2 that all control informations all are based upon on the circuit after the conversion except that layer 3 " protection ".
Like this, break even detect the L2 link, the conversion of master clock was finished before the processing of execution in step 34.Thereby can avoid over owing to detecting the confusion that is transformed into the control information transmission on the back-up circuit that L2 link is disconnectedly keeped in repair, thereby the master clock conversion produces.
The following describes second embodiment.
The composition of second embodiment is identical with first embodiment basically.Identical for this reason part adopts identical symbol, illustrates and is omitted, and different parts only is described.
Figure 11 represents the inside composition diagram of the control device BSC of radio base office among second embodiment.In a second embodiment the L3/ among first embodiment is used processing unit 17 and hardware control unit 20 and change L3/ application processing unit 41 and hardware control unit 42 into.
L3/ uses 41 couples of interface and subscriber exchange LE based on the ISDN of the BTS of radio base office end use of processing unit and holds employed PSTN interface (agreement) to change, and the control device BSC of radio base office is controlled comprehensively.L3/ uses the transmission quality that processing unit 41 is also checked control information, is transferred to hardware control unit 42 as link information.But; L3/ uses processing unit 41 and does not go to select (protection is selected) should carry out this work of circuit that control information is transmitted according to the stateless of link information and clock signal (A is disconnected, B disconnected) information as first embodiment, and this work is undertaken by hardware control unit 42.
L3/ uses processing unit 41 and receives protection selection information, sets time slot etc., so that can carry out the transmission of control information by selected circuit.
Figure 12 is the inside composition diagram of hardware control unit 42.The disconnected detecting unit 52,53 of selector among Figure 12 (SEL) 51, clock, voluntarily clock generator 55, PLL circuit 56 and master clock allocation units 57 have respectively with first embodiment shown in Figure 4 in the disconnected detecting unit 32,33 of selector (SEL) 31, clock, clock generator 35, PLL circuit 36 and master clock allocation units 37 identical functions voluntarily.
When clock control cell 54 does not have the clock signal composition at the disconnected detecting unit 52,53 of clock, then distinguish the disconnected detection signal of transfer clock (A is disconnected, B breaks), use the link information that processing unit 41 transmits expression control information transmission qualities from L3/ simultaneously.Clock control cell 54 is according to disconnected detection signal of this clock (A is disconnected, B breaks) and link information, and according to the logic identical with logic shown in Figure 5, " A ", " B ", " preceding maintenance ", the some signals in " voluntarily " are represented in output.Simultaneously, clock control cell 54 is according to the logic identical with logic shown in Figure 5, and selection should be carried out the circuit of control information transmission, selects message transmission to use processing unit 41 to L3/ as protection an information in " A ", " B ", " the preceding maintenance ".
Second embodiment and the first embodiment difference are as from the foregoing: the protection among Fig. 5 that L3/ application processing unit 17 is carried out among first embodiment is chosen in second embodiment and is undertaken by clock control cell 54.
As mentioned above, among the present invention, first kind is not the fault that does not have digital signal fully unusually on the circuit, but the unusual of re-send request may must be frequently sent in the deterioration of digital data transmission.In the time of on this used the 1st circuit that occurs in transmission of control signals unusually, even according to the 1st digital signal that circuit transmitted, continuing has clock regeneration, though do not break down in the synchronizing regeneration of clock, also to transform on the 2nd clock regeneration that the digital signal that circuit transmitted produces according to the back-up of transmission of control signals.
Like this, the master clock conversion will be carried out layer 2 link are being set up in control information on the 2nd circuit before, thereby can avoid being transformed into this existing issue of confusion that the 2nd control information on the circuit caused because of the master clock conversion in transmission.
When not having second kind of digital signal unusual on the 1st circuit, taking place when cutting off fully as circuit, certainly to transform to according on the 2nd clock regeneration that the digital signal that circuit transmitted produces, meanwhile realize the transmission of control information at once by the 2nd circuit.
Like this,, therefore eliminated, the conversion process of control information can be carried out rapidly to sending the needed stand-by period of retry of stipulated number because the conversion process of control information is carried out after the master clock conversion at once.
Thereby,, still can realize the transmission of high reliability to control information even on the circuit of control information transmission, break down.
Claims (8)
1. a network synchronous device is used to make the network that is connected with public network by two digital circuits at least to synchronous working with public network,
It is characterized in that having:
Be installed between public network switch and the network, but either party the 1st and the 2nd circuits of control information transmission all;
The synchronised clock distributor is selected in the above-mentioned the 1st and the 2nd circuit, and the clock signal of the digital signal clock synchronised of being transmitted on generation and the selected circuit is distributed to each device of forming network;
Clock abnormal detector, monitoring detect clock status by the above-mentioned the 1st and the 2nd each digital signal that circuit transmitted;
Worsen checkout gear, monitoring is by the above-mentioned the 1st and the 2nd each digital signal that circuit transmitted, detected transmission deterioration state;
The clock reference circuit is determined device, according to the clock status of above-mentioned clock abnormal detector detection and the transmission quality degradation mode of above-mentioned deterioration checkout gear detection, in the above-mentioned the 1st and the 2nd circuit, determine the circuit that above-mentioned synchronised clock distributor should be selected; And
The control information transmission control device, the transmission quality degradation mode that clock status that detects according to above-mentioned clock abnormal detector and above-mentioned deterioration checkout gear are detected, in the above-mentioned the 1st and the 2nd circuit, determine to answer the circuit of control information transmission, realize being determined the circuit control information transmission by this.
2. network synchronous device as claimed in claim 1 is characterized in that:
Carry out the V5.2 interface communication of LTU-T defined between above-mentioned public network and above-mentioned network, the above-mentioned the 1st and the 2nd circuit is first order circuit and the 2nd grade of circuit in the V5.2 interface.
3. the described network synchronous device of claim 1 is characterized in that:
Detecting transmission quality on above-mentioned deterioration checkout gear in the above-mentioned the 1st and the 2nd circuit worsens, and above-mentioned clock abnormal detector is when the both sides of the 1st and the 2nd circuit detect the clock normal condition, and above-mentioned clock reference circuit determines that device is not defined as the circuit that above-mentioned synchronised clock distributor should be selected with being detected that circuit that transmission quality worsens in the above-mentioned the 1st and the 2nd circuit.
4. the described network synchronous device of claim 1 is characterized in that:
On above-mentioned clock abnormal detector in the above-mentioned the 1st and the 2nd circuit, detect the clock failure state, and above-mentioned deterioration checkout gear all do not detect transmission quality when worsening on arbitrary of the above-mentioned the 1st and the 2nd circuit, and above-mentioned control information transmission control device does not detect in the above-mentioned the 1st and the 2nd circuit on that circuit of clock failure state and realizes control information transmission.
5. the described network synchronous device of claim 1 is characterized in that also having:
Clock distributing equipment voluntarily, produce the nonsynchronous clock signal voluntarily of clock of each digital signal of being transmitted on a kind of and the above-mentioned the 1st and the 2nd circuit, when above-mentioned clock abnormal detector all detects the malfunction of clock in the above-mentioned the 1st and the 2nd circuit, with this voluntarily clock distribution give to form each device of network.
6. the described network synchronous device of claim 1 is characterized in that also comprising
External command is determined line unit, is used for when changing the circuit of answering control information transmission by force, the circuit that will change in the above-mentioned the 1st and the 2nd circuit being defined as the circuit that above-mentioned synchronised clock distributor should be selected by the input external command.
7. the described network synchronous device of claim 1 is characterized in that:
Above-mentioned control information transmission control device comprises:
For by above-mentioned definite circuit control information transmission, the message exchange that between above-mentioned switch and above-mentioned network, carries out information exchange, and
The a plurality of information units that the composition control information also are set in the different time-gap position respectively are set in respectively by above-mentioned definite locational setting device of digital signal time slot corresponding that circuit transmitted,
When detecting transmission quality on above-mentioned deterioration checkout gear in the above-mentioned the 1st and the 2nd circuit when worsening, above-mentioned message exchange, above-mentioned clock reference circuit determine that device and above-mentioned setting device determine device, the such sequential working of setting device by message exchange, clock reference circuit.
8. the described network synchronous device of claim 1 is characterized in that:
Above-mentioned control information transmission control device comprises:
For the message exchange that between above-mentioned switch and above-mentioned network, carries out information exchange by above-mentioned determined circuit control information transmission, and
The a plurality of information units that the composition control information also are set in the different time-gap position respectively are set in respectively by above-mentioned definite locational setting device of digital signal time slot corresponding that circuit transmitted,
When detecting the clock failure state in above-mentioned clock abnormal detector in the above-mentioned the 1st and the 2nd circuit, above-mentioned message exchange, above-mentioned clock reference circuit determine that device and above-mentioned setting device determine device, the such sequential working of setting device by message exchange, clock reference circuit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP254422/97 | 1997-09-19 | ||
| JP9254422A JPH1198585A (en) | 1997-09-19 | 1997-09-19 | Network synchronization device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1212595A CN1212595A (en) | 1999-03-31 |
| CN1094707C true CN1094707C (en) | 2002-11-20 |
Family
ID=17264768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98104238A Expired - Fee Related CN1094707C (en) | 1997-09-19 | 1998-01-14 | Network synchronous device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH1198585A (en) |
| CN (1) | CN1094707C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102238719B (en) * | 2010-04-27 | 2014-10-08 | 中国移动通信集团公司 | Time synchronization method and device and distributed time synchronization system |
| CN102487318A (en) * | 2010-12-06 | 2012-06-06 | 中国移动通信集团公司 | Method, equipment and system for transmitting time synchronization information on ground |
| US10394735B2 (en) * | 2017-01-09 | 2019-08-27 | Nanya Technology Corporation | Comparative forwarding circuit providing first datum and second datum to one of first circuit and second circuit according to target address |
-
1997
- 1997-09-19 JP JP9254422A patent/JPH1198585A/en not_active Withdrawn
-
1998
- 1998-01-14 CN CN98104238A patent/CN1094707C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1212595A (en) | 1999-03-31 |
| JPH1198585A (en) | 1999-04-09 |
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