CN104066102A - Fault location detection method, system and device for time synchronization system - Google Patents

Abstract

The invention discloses a fault positioning detection method, system and device of a time synchronization system. A master-slave link through nodes is established between a time server TS and a wireless base station. A transmission link is established between the wireless base station and the TS. The method comprises the steps that the TS receives wireless base station clock information transmitted by the wireless base station through the transmission link; the TS determines whether the difference between the received wireless base station clock information and local clock information exceeds set system tolerance; if the difference exceeds the set system tolerance, the TS indicates each node on the master-slave link to upload the own clock information to the TS; and the TS compares the received clock information of each node with the difference of the local clock information, and respectively confirms whether the set system tolerance is exceeded to determine a node with a time synchronization fault. According to the invention, the node with the time synchronization fault can be accurately detected.

Description

Fault location detection method, system and device for time synchronization system

technical field

The invention relates to the field of transmission systems, in particular to a fault location and detection method, system and device for a time synchronization system.

Background technique

IEEE1588V2 is a high-precision synchronization protocol standard using a transmission system. It defines the precision clock synchronization (PTP) protocol of the Ethernet network. The precision can reach sub-microsecond level, and it can realize frequency synchronization and time synchronization. Time synchronization refers to the phase synchronization of time.

When performing time synchronization, the system is called a time synchronization system. The principle of time synchronization in a time synchronization system is: the master device (Master) and the slave device (Slave) use synchronization (Sync) messages, tracking (Follow_Up) messages, delay requests The (Delay_Req) message and the delay response (Delay_Resp) message inform each other of precise time stamps, and the best clock source is selected through the best clock algorithm (BMC, Best Master Clock Algorithm) to complete frequency and time synchronization, as shown in Figure 1. 1 is a schematic diagram of a framework for message interaction between a master device and a slave device in the prior art.

Fig. 2 is the flow chart of the time synchronization method in the prior art time synchronization system, and its specific steps are:

Step 201, the picture transfer protocol (PTP) application layer of the master device sends a synchronization message to the slave device, the synchronization message includes the estimated time t1' when the message leaves the master device, and the master device simultaneously records the precise time when the synchronization message leaves the PTP application layer port t1;

Step 202, receiving the synchronization message from the device, recording the time t2 for receiving the synchronization message, and reporting it to the PTP application layer of the slave device;

Step 203, the PTP application layer of the master device sends a tracking message to the slave device, and the message carries the precise time t1 when the synchronization message leaves the PTP application layer port;

Step 204, after receiving the tracking message from the device, record the precise time t1 when the synchronization message is away from the PTP application layer port;

After this step, the slave device can know the estimated time t1' and the precise time t1 of the synchronization message transmission, and receive the synchronization time t2;

Step 205, the PTP application layer of the slave device sends a delay request message to the master device, and the slave device records the time t3 when the delay message leaves the PTP application layer port;

Step 206, the master device records the time t4 of receiving the delay request message, and sends the time t4 of receiving the delay request message to the slave device through a delay response message.

After the above steps, formula (1) and formula (2) can be obtained:

Time difference between master and slave devices = compensation value of slave devices + master and slave device transmission message delay value = t2-t1 or t2-t1'; formula (1)

The time difference between slave master devices = slave master device transmission message delay value - slave device compensation value = t4-t3 formula (2)

Assuming that the master-slave device transmission message delay value is the same as the master device transmission message delay value, it can be obtained on the slave device: the compensation value of the slave device = ((t2-t1)-(t4-t3))/2

Delay value = ((t4-t3) + (t2-t1))/2

In this way, the slave device compensates the local time of the slave device according to the compensation value of the slave device, and realizes time synchronization between the slave device and the master device.

The schematic diagram of the structure of the packet transport network (PTN) in the prior art is shown in Figure 3, including: multiple PTN nodes form a ring network, and the time server (TS, Time Server) providing the master clock is deployed above the convergence layer of the PTN network , the PTN node directly connected to the TS is node A. The wireless base station is connected to the nodes in the PTN, for example, the wireless base station is connected to the node E. When the wireless base station needs to synchronize the master clock, a master-slave synchronization chain is established between node A and node E. In the figure, node A-node B-node C-node D-node E is called the master-slave synchronization chain , the establishment of the master-slave synchronization chain is automatically generated by the BMC or completed by manual configuration. Each node on the master-slave synchronization chain uses the boundary clock (BC) mode to synchronize its previous node to achieve step-by-step synchronization. As shown in Figure 3, the first node A and the tail node E of the master-slave synchronization chain run the ordinary clock (OC) mode, and the rest of the intermediate nodes run the BC mode, and the node B is synchronized to the node A, and the node C is synchronized to the node B. D is synchronized to node C, node E is synchronized to node D, and finally the wireless base station time is synchronized to TS.

In Figure 3, the time synchronization accuracy of each node and wireless base station depends on the service traffic and the hardware of each node. For example, one of the nodes may have a greatly reduced time synchronization accuracy due to a crystal oscillator failure of its own timer. On a master-slave link, if a time synchronization failure occurs on an intermediate node, it will seriously affect the time synchronization accuracy of the downstream node. Moreover, when a time synchronization problem occurs, the downstream node cannot know whether the time synchronization failure has occurred in the upstream node, and it is further impossible to know which upstream node has the time synchronization failure. For example, in Figure 3, for example, a clock synchronization failure occurs on the port of node D connected to node C, resulting in a decrease in the accuracy of time synchronization, but because the time synchronization process of the port of node B connected to node C is normal, node B will not find node C Time synchronization failure, and node D can only synchronize the time output by node C, and will not find the clock synchronization failure of node C. Therefore, no failure of node C is found on the entire master-slave link, which will lead to the failure of the wireless base station The time synchronization accuracy is seriously reduced, which will further affect the transmission of services.

Contents of the invention

In view of this, the present invention provides a fault location and detection method for a time synchronization system, which can accurately detect a node with a time synchronization fault.

The invention also provides a fault location detection system of the time synchronization system, which can accurately detect the node of the time synchronization fault.

The invention also provides a fault location detection device of the time synchronization system, which can accurately detect the node of the time synchronization fault.

In order to achieve the above object, the technical solution implemented by the present invention is specifically realized in this way:

A fault location and detection method for a time synchronization system. A master-slave link via a node is established between a time server TS and a wireless base station, and a transmission link is established between the wireless base station and the TS. The method includes:

The TS receives the wireless base station clock information transmitted by the wireless base station through the transmission link. The TS determines whether the difference between the received wireless base station clock information and the local clock information exceeds the set system tolerance value. If it exceeds, the TS indicates the master-slave link. Each node uploads its own clock information to TS respectively;

The TS compares the difference between the received clock information of each node and the local clock information, and determines whether the time synchronization failure node is determined by respectively confirming whether it exceeds the set system tolerance value.

The node for determining the time synchronization failure is:

The hop-by-hop nodes in the master-slave link are determined one by one, and the node closest to the TS among the nodes in the master-slave link that exceeds the set system tolerance value is determined to be the node with a time synchronization failure.

When the transmission link transmits wireless base station clock information and each node transmits clock information, TS and adjacent nodes adopt OC mode, adjacent nodes adopt TC mode, wireless base station and adjacent nodes adopt OC mode.

The wireless base station clock information received by the TS is transparently transmitted hop by hop through the nodes on the transmission link, and the clock information of the nodes in the master-slave link received by the TS is transparently transmitted hop by hop through the nodes in between .

The transmission link established between the wireless base station and the TS is a master-slave link between the TS and the wireless base station or a protection link from the wireless base station to the TS via a node of a non-master-slave link.

Each node on the master-slave link uploads its own clock information to the TS respectively, which is the master-slave link between the TS and the node or the protection link between the non-master-slave link and the slave node to the TS.

A fault location and detection system for a time synchronization system, comprising: a wireless base station, a TS, a node in the master-slave link between the TS and the wireless base station, and establishing a transmission link between the wireless base station and the TS, wherein,

The wireless base station is used to send the clock information of the wireless base station to the TS through the transmission link;

The node is used to transmit the node clock information to the TS through the transmission link between the wireless base station and the node under the instruction of the TS;

TS, used to receive the wireless base station clock information transmitted by the wireless base station through the link, determine whether the difference between the received wireless base station clock information and the local clock information exceeds the set system tolerance value, and if so, instruct each node to set its own clock The information is uploaded separately; according to the difference between the received clock information of each node and the local clock information, and according to whether it exceeds the set system tolerance value, determine the node with time synchronization failure.

The transmission link between the wireless base station and the TS is a master-slave link between the TS and the wireless base station or a protection link from the wireless base station to the TS via a node of a non-master-slave link;

The link between the node and the TS is a master-slave link between the TS and the node or a protection link between the slave node and the TS that is not a master-slave link.

A fault location detection device for a time synchronization system, comprising: a transceiver module, a judgment module and an indication module, wherein,

The transceiver module is used to receive the wireless base station clock information transmitted by the wireless base station through the link; receive the own clock information uploaded by each node;

Judgment module, used to determine whether the difference between the received wireless base station clock information and the local clock information exceeds the set system tolerance value, if exceeded, send an indication message to the indication module; according to the received clock information of each node and the local clock The information difference is compared, and the node with time synchronization failure is determined according to whether it exceeds the set system tolerance value respectively;

The indication module is configured to instruct each node to upload its own clock information according to the indication message sent by the judging module.

A fault location detection device for a time synchronization system, comprising:

The upload module is used to upload its own clock information and transparently transmit the received clock information.

As can be seen from the above scheme, after the method provided by the present invention completes the time synchronization of the master-slave link, the wireless base station transmits the clock information of the wireless base station to the TS through the master-slave link, and the TS determines that the received clock information of the wireless base station is consistent with the local Whether the difference of clock information exceeds the set system tolerance value, if it exceeds, it will instruct each node on the master-slave link to upload its own clock information to TS, and TS will compare with the local clock according to the received clock information of each node The information difference is compared to respectively confirm whether it exceeds the set system tolerance value, and accurately determine the node of the time synchronization failure. Furthermore, a non-master-slave link is established from the wireless base station to the TS through the node. Through the protection link, the TS determines whether the difference between the received wireless base station clock information and the local clock information exceeds the set system Tolerance value, if it exceeds, establish the protection link from the node of each master-slave link to the TS of the non-master-slave link, and indicate the master-slave link through the protection link from the node of each master-slave link to TS Each node on the link uploads its own clock information to TS, and TS compares the difference between the received clock information of each node and the local clock information, respectively confirms whether it exceeds the set system tolerance value, and accurately determines the time Sync failed nodes. In this way, nodes with time synchronization failures can be accurately detected.

Description of drawings

FIG. 1 is a schematic diagram of a framework of message interaction between a master device and a slave device in the prior art;

Fig. 2 is the flow chart of the time synchronization method in the prior art time synchronization system;

Fig. 3 is the schematic diagram of the master-slave link provided by the prior art;

FIG. 4 is a flowchart of a fault location and detection method for a time synchronization system provided by an embodiment of the present invention;

FIG. 5 is a schematic diagram of a master-slave link provided by an embodiment of the present invention;

FIG. 6 is a flow chart of the second fault location and detection method of the time synchronization system provided by the embodiment of the present invention;

7 is a schematic diagram of a protection link from a wireless base station to a TS through a node through a non-master-slave link provided by an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a fault location detection system of a time synchronization system provided by an embodiment of the present invention;

FIG. 9 is a schematic diagram of a TS structure provided by an embodiment of the present invention;

FIG. 10 is a schematic diagram of a node structure provided by an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

In order to detect whether there is a node with a time synchronization failure on the master-slave link from the TS via the node to the mobile base station, the present invention establishes a via node between the time server TS and the wireless base station after completing the time synchronization of the master-slave link. A master-slave link for establishing a transmission link between the wireless base station and the TS, the method includes: the TS receives the wireless base station clock information transmitted by the wireless base station through the transmission link, and the TS determines the difference between the received wireless base station clock information and the local clock information Whether the difference exceeds the set system tolerance value, if it exceeds, TS instructs each node on the master-slave link to upload its own clock information to TS respectively; Values are compared, and the nodes with time synchronization failures are determined according to whether they exceed the set system tolerance value respectively.

Here, the established link can be a master-slave link between TS and wireless base station or a protection link from wireless base station to TS via a node through a non-master-slave link, and the link between node and TS is TS and node The protection link between the master-slave link or the non-master-slave link slave node and the TS. Each will be described in detail below.

After completing the time synchronization of the master-slave link, the wireless base station transmits the clock information of the wireless base station to the TS through the master-slave link, and the TS determines whether the difference between the received wireless base station clock information and the local clock information exceeds the set system tolerance If it exceeds the value, it indicates that each node on the master-slave link uploads its own clock information to TS, and TS compares the difference between the received clock information of each node and the local clock information to confirm whether it exceeds the set value. The system tolerance value can accurately determine the node of the time synchronization failure.

Fig. 4 is the flow chart of the fault location and detection method of the time synchronization system provided by the embodiment of the present invention, establishing the master-slave link from the TS to the mobile base station via the node, and after completing the time synchronization of the master-slave link, the method also includes:

Step 401, the TS receives the wireless base station clock information transmitted by the wireless base station via the node;

Step 402, the TS determines whether the difference between the received wireless base station clock information and the local clock information exceeds the set system tolerance value, and if so, executes step 403; if not, ends the process;

Step 403, TS instructs each node on the master-slave link to upload its own clock information to TS respectively;

Step 404, TS compares the difference between the received clock information of each node and the local clock information, and determines the node with time synchronization failure according to whether it exceeds the set system tolerance value respectively;

In this step, after determining the hop-by-hop nodes in the master-slave link one by one, it is determined that among the nodes in the master-slave link that exceed the system tolerance value, the node closest to the TS is the node with a time synchronization failure.

In the method described in Figure 4, when the master-slave link transmits the clock information of the wireless base station and each node transmits the clock information, the TS and the adjacent nodes adopt the OC mode, and the adjacent nodes adopt the transparent clock (TC) Mode, wireless base station and adjacent nodes adopt OC mode. In the TC mode, the master device transparently transmits its own clock information to the slave device through each node, so that the slave device can perform time synchronization. This TC mode is an existing technology.

In the method described in Figure 4, the nodes in the master-slave link are distributed in the core network, aggregation network and access network, the mobile base station accesses the master-slave link through the nodes of the access network, and the TS passes through the nodes of the core network Access to the master-slave link, the nodes of the access network and the nodes of the core network exchange clock information through the nodes of the aggregation network.

In the method described in Figure 4, the wireless base station clock information received by the TS is transmitted hop-by-hop through the nodes on the master-slave link, and the clock information of the nodes in the master-slave link received by the TS is also transmitted between the two The node transmits hop by hop.

In this method, after each node on the master-slave link receives the clock information sent by the downstream node, it just uploads it to the upstream node until TS, without updating and synchronizing the clock on the node.

To give a specific example, Figure 5 is a schematic diagram of the master-slave link provided by the embodiment of the present invention. The master-slave link is based on the master-slave link in Figure 3, and the dotted line on the way is the clock information return path. Using the present invention, If the time synchronization in the master-slave link fails, the TS determines that the difference between the received wireless base station clock information and the local clock information exceeds the set system tolerance value, and then instructs each node in the master-slave link to The clock information is returned, and the fault location is judged by detecting which node the clock information is inaccurate. For example, if the downlink port of node C fails, TS finds that the backhaul clock information of node A, node B, and node C is accurate, but the backhaul clock information of node D and node E is inaccurate, so it is determined that the downlink port of node C The link from the port to node D fails.

Using the method provided above by the present invention, in a special case, the node of time synchronization failure cannot be detected: a span in the master-slave link has caused a delay value bidirectional If it is inconsistent, the node where the time synchronization fails cannot be detected.

Specifically, when the delay value of the master-slave link is inconsistent in both directions, when the time synchronization of the master-slave link is performed, the up-hop node is the master device, the down-hop node is the slave device, and the link between the up-hop node and the down-hop node The path delay is a delay value of 1, and the link delay between the down-hop node and the up-hop node is a delay value of 2, then according to formula (1) and formula (2):

The actual compensation value of the slave device = ((t2-t1)-(t4-t3))/2+(delay value 2-delay value 1)/2;

In this state, the compensation value of the slave device estimated by the downstream node = ((t2-t1)-(t4-t3))/2, which makes the time synchronization process deviate, which will affect all after the master-slave link node.

In the subsequent time synchronization process of detecting the master-slave link, the down-hop node acts as the master device, and the up-hop node acts as the slave device. The link delay between the up-hop node and the down-hop node is a delay value of 2, and the The link delay between hop nodes is a delay value of 1, then according to formula (3) and formula (4):

The actual compensation value of the slave device = ((T2-T1)-(T4-T3))/2+(delay value 1-delay value 2)/2;

And the compensation value of the slave device estimated by the upstream node = ((T2-T1)-(T4-T3))/2.

If the clock time of the upstream node is t0, for the correct time synchronization process, the estimated time after compensation received by the upstream node should be: t0 + the compensation value of the slave device estimated by the downstream node + the compensation value of the slave device estimated by the upstream node = (t2-t1)-(t4-t3)/2+(T2-T1)-(T4-T3)/2;

For the actual situation, the actual time after compensation received by the upstream node should be: t0 + actual compensation value of the slave device + actual compensation value of the slave device = (t2-t1)-(t4-t3)/2+(T2 -T1)-(T4-T3)/2.

Here, the compensated estimated time received by the upstream node is the same as the compensated actual time received by the upstream node, so a span in the master-slave link is due to some reason such as the replacement of a single-sided fiber When the delay value is inconsistent in both directions, the node of the time synchronization failure cannot be detected. In order to solve this problem, the present invention adopts a non-identical routing scheme, including: establishing a non-master-slave link from the wireless base station to a protection link from the wireless base station to the TS through the node, through which the TS determines that the received wireless base station clock information is consistent with Whether the difference of the local clock information exceeds the set system tolerance value, if so, establish the protection links from the nodes of each master-slave link to the TS of the non-master-slave link respectively, and pass the protection link from each master-slave link The protection link from the node to the TS, instructs each node on the master-slave link to upload its own clock information to the TS, and the TS compares the difference between the received clock information of each node and the local clock information, and confirms whether Exceeding the set system tolerance value, accurately determine the node of the time synchronization failure.

FIG. 6 is a flow chart of the second fault location and detection method of the time synchronization system provided by the embodiment of the present invention, and its specific steps are:

Step 601, establishing a non-master-slave link from the wireless base station to the TS protection link via the node;

Step 602, the TS determines whether the difference between the received wireless base station clock information and the local clock information exceeds the set system tolerance value through the protection link, and if so, executes step 603; if not, ends the process;

Step 603, the TS respectively establishes protection links from each node of the master-slave link to the TS of the non-master-slave link;

Step 604, the TS instructs each node on the master-slave link to upload its own clock information to the TS through the protection link from each node of the master-slave link to the TS;

Step 605 , the TS compares the difference between the received clock information of each node and the local clock information, respectively confirms whether it exceeds the set system tolerance value, and determines the node with time synchronization failure.

In this step, after determining the hop-by-hop nodes in the master-slave link one by one, it is determined that among the nodes in the master-slave link that exceed the system tolerance value, the node closest to the TS is the node with a time synchronization failure.

In the method described in FIG. 6 , the wireless base station clock information is returned from the wireless base station through the protection link from the node to the TS, and the clock information is returned from each node of the master-slave link to each node of the protection link of the TS When transmitting information, the TS and adjacent nodes adopt the OC mode, the adjacent nodes adopt the TC mode, and the wireless base station and the adjacent nodes adopt the OC mode.

In the method described in Figure 6, the wireless base station clock information received by the TS is transmitted hop-by-hop through the wireless base station via the node on the protection link to the TS, and the node clock information received by the TS in the master-slave link It is transmitted hop-by-hop between the node of the master-slave link and the node of the protection link of the TS.

To give a specific example, FIG. 7 is a schematic diagram of a protection link from a wireless base station to a TS through a node through a non-master-slave link provided by an embodiment of the present invention. The master-slave link is based on the master-slave link in FIG. The dotted line in is the clock information return path. With the present invention, a non-master-slave link is established to establish a protection link from the wireless base station to the TS via the node. As shown in the dotted line in the figure, through the protection link, the TS determines the received wireless The difference between the base station clock information and the local clock information exceeds the set system tolerance value, and then instructs each node in the master-slave link to return through the established protection link of each node to the TS non-master-slave link Clock information, as shown by the dotted line in the figure, determines the location of the fault by detecting which node’s clock information is inaccurate. For example, if the downlink port of node C fails, TS finds that the backhaul clock information of node A, node B, and node C is accurate, but the backhaul clock information of node D and node E is inaccurate, so it is determined that the downlink port of node C The link from the port to node D fails.

Fig. 8 is a schematic structural diagram of a fault location and detection system of a time synchronization system provided by an embodiment of the present invention, including: a wireless base station, a TS, nodes in the master-slave link between the TS and the wireless base station, and establishing a transmission between the wireless base station and the TS link, where

The wireless base station is used to send the clock information of the wireless base station to the TS through the transmission link;

The node is used to transmit the node clock information to the TS through the transmission link between the wireless base station and the node under the instruction of the TS;

TS, used to receive the wireless base station clock information transmitted by the wireless base station through the link, determine whether the difference between the received wireless base station clock information and the local clock information exceeds the set system tolerance value, and if so, instruct each node to set its own clock The information is uploaded separately; according to the difference between the received clock information of each node and the local clock information, and according to whether it exceeds the set system tolerance value, determine the node with time synchronization failure.

In this system, the established transmission link between the wireless base station and the TS can be a master-slave link between the TS and the wireless base station or a non-master-slave link from the wireless base station to the TS through a node to protect the link.

In this system, the link between the node and the TS is a master-slave link between the TS and the node or a protection link between the slave node and the TS which is not a master-slave link.

Fig. 9 is a schematic structural diagram of a TS provided by an embodiment of the present invention, including: a transceiver module, a judging module and an indicating module, wherein,

The transceiver module is used to receive the wireless base station clock information transmitted by the wireless base station through the link; receive the own clock information uploaded by each node;

Judgment module, used to determine whether the difference between the received wireless base station clock information and the local clock information exceeds the set system tolerance value, if exceeded, send an indication message to the indication module; according to the received clock information of each node and the local clock The information difference is compared, and the node with time synchronization failure is determined according to whether it exceeds the set system tolerance value respectively;

The indication module is configured to instruct each node to upload its own clock information according to the indication message sent by the judging module.

In this structure, the clock information is transmitted between the transceiver module and the node in OC mode.

FIG. 10 is a schematic diagram of a node structure provided by an embodiment of the present invention, including: an upload module, configured to upload its own clock information and transparently transmit received clock information.

In this structure, an instruction confirmation module is also included, which is used for uploading the clock information of itself after receiving the instruction from the TS, and transparently transmitting the received clock information.

The preferred embodiments above are used to further describe the purpose, technical solutions and advantages of the present invention in detail. It should be understood that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Within the spirit and principles of the present invention, any modifications, equivalent replacements and improvements, etc., shall be included within the protection scope of the present invention.

Claims (10)

1. a fault location test method for clock synchronization system, is characterized in that, between time server TS and wireless base station, sets up and has the principal and subordinate's link through node, between wireless base station and TS, sets up transmission link, and the method comprises:

TS receives wireless base station through the wireless base station clock information of transmission link transmission, TS determines whether the wireless base station clock information of reception and the difference of local clock information surpass the system tolerance value arranging, if surpassed, each node on TS indication principal and subordinate link is uploaded to respectively TS by self clock information;

TS compares with the difference of local clock information respectively according to each received nodal clock information, according to being confirmed whether respectively, surpasses the system tolerance value arranging, and determines the node of time synchronized fault.

2. the method for claim 1, is characterized in that, the node of described definite time synchronized fault is:

Hop-by-hop node in principal and subordinate's link is judged one by one, determined that in the node that surpasses set system tolerance value in principal and subordinate's link be the node of time synchronized fault from the nearest node of TS.

3. the method for claim 1, it is characterized in that, when described transmission link transmission wireless base station clock information and each node transfer clock information, TS and adjacent node adopt OC pattern, between adjacent node, adopt TC pattern, wireless base station and adjacent node adopt OC pattern.

4. the method for claim 1, it is characterized in that, the wireless base station clock information that described TS receives is through the node hop-by-hop transparent transmission on transmission link, and the nodal clock information in principal and subordinate's link that TS receives is through node hop-by-hop transparent transmission between the two.

5. the method for claim 1, is characterized in that, between described wireless base station and TS, set up transmission link and be principal and subordinate's link of TS and wireless base station or non-principal and subordinate's link from wireless base station through node the protection link to TS.

6. the method for claim 1, is characterized in that, the link that each node on principal and subordinate's link is uploaded to respectively TS by self clock information be principal and subordinate's link between TS and node or non-principal and subordinate's link from node to TS between protection link.

7. a fault location detection system for clock synchronization system, is characterized in that, comprising: the node between wireless base station, TS, TS and wireless base station in principal and subordinate's link, set up the transmission link between wireless base station and TS, wherein,

Wireless base station, for sending to TS by wireless base station clock information through transmission link;

Node, under the indication of TS, the transmission link by nodal clock information between wireless base station and node is transferred to TS;

TS, for receiving wireless base station through the wireless base station of link transmission clock information, whether the wireless base station clock information determine receiving and the difference of local clock information surpass the system tolerance value of setting, if surpassed, indicate each node that self clock information is uploaded respectively; According to each received nodal clock information, compare with the difference of local clock information respectively, according to being confirmed whether respectively, surpass the system tolerance value arranging, determine the node of time synchronized fault.

8. system as claimed in claim 7, is characterized in that, the transmission link between described wireless base station and TS be principal and subordinate's link of TS and wireless base station or non-principal and subordinate's link from wireless base station through node the protection link to TS;

Link between described node and TS be principal and subordinate's link between TS and node or non-principal and subordinate's link from node to TS between protection link.

9. a fault location checkout gear for clock synchronization system, is characterized in that, comprising: transceiver module, judge module and indicating module, wherein,

Transceiver module, for receiving wireless base station through the wireless base station of link transmission clock information; Self clock information that receives that each node uploads respectively;

Judge module, for determining whether the wireless base station clock information of reception and the difference of local clock information surpass the system tolerance value arranging, if surpassed, sends Indication message to indicating module; According to each received nodal clock information, compare with the difference of local clock information respectively, according to being confirmed whether respectively, surpass the system tolerance value arranging, determine the node of time synchronized fault;

Indicating module, indicates each node that self clock information is uploaded respectively for the Indication message sending according to judge module.

10. a fault location checkout gear for clock synchronization system, is characterized in that, comprising:

Upper transmission module, for uploading self clock information, by the clock information transparent transmission receiving.