CN100442903C - Realization method and device for improving clock source stability - Google Patents
Realization method and device for improving clock source stability Download PDFInfo
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- CN100442903C CN100442903C CNB2006100016575A CN200610001657A CN100442903C CN 100442903 C CN100442903 C CN 100442903C CN B2006100016575 A CNB2006100016575 A CN B2006100016575A CN 200610001657 A CN200610001657 A CN 200610001657A CN 100442903 C CN100442903 C CN 100442903C
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Abstract
The present invention relates to a realization method and a device for improving the stability of a clock source, which mainly comprises following steps: firstly, under the condition that a plurality of chain circuits are used by a base station, one of the chain circuits is selected by the base station for offering an IUB clock source as a reference clock source, and the condition of the chain circuit is detected by the system periodically; then, when failures, such as high error code, frequent interruption or physical chain break, etc., occur in the chain circuit offering the IUB clock source, the system does not need operation management to the chain circuit by maintenance personnel, the failures can be detected by the base station, and the reference clock source is switched over automatically to the chain circuit in normal state, and other chain circuit is used for continuing with the reference clock source. The present invention has the advantages that the base station can be prevented from losing a clock source because the maintenance is not carried out by the maintenance personnel on time, or the misoperation of the maintenance personnel, so the normal work of the base station is ensured, and the stability of the clock source obtained by the system is provided.
Description
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a method and an apparatus for improving clock source stability.
Background
In the existing wireless communication network, the NodeB (base station) can operate normally only by having an external clock source to correct its clock frequency. In a system, the clock source used to correct the NodeB clock is referred to as the reference clock source. Wherein, the IUB (wireless network air interface) clock source is one of the reference clock sources, and the IUB clock source is usually provided by a designated link. When setting the IUB clock source, one of the plurality of transmission links is typically designated, and the link provides the clock source to check the clock frequency of the base station.
Under the current technical condition, if a physical link providing a clock source for a base station has high error code, frequent flash and physical layer fault, or a problem occurs in the logical connection of the link providing the clock source for the base station due to misoperation of maintenance personnel, an IUB clock source provided for the base station cannot be continuously used by the base station, and a base station system can only work in a free oscillation state to form clock source signal loss and lose time standard, so that the quality and the capability of the base station for providing services are influenced, and the satisfaction degree of a user on an operator is reduced.
In addition, in the prior art, when the base station system operates in a free oscillation state, maintenance personnel may also be required to frequently check and set a link providing a clock source and adjust a clock of a base station losing a clock source signal, which inevitably increases workload of the maintenance personnel and a possibility of problems occurring in a maintenance process. Moreover, if the maintenance personnel do not deal with the problems or malfunction in time, the communication service quality of the system is reduced.
Disclosure of Invention
In view of the problems existing in the prior art, an object of the present invention is to provide a method for improving clock source stability, by which a system can automatically switch to a link in a normal state to provide an IUB clock source without maintenance personnel when the link providing the IUB clock source fails, thereby ensuring normal operation of a base station and improving stability of the base station obtaining the clock source.
The purpose of the invention is realized by the following technical scheme:
the invention provides a realization method for improving clock source stability, which comprises the following steps:
A. the system detects the state of a link providing a reference clock source for a base station;
B. when the link providing the reference clock source fails, whether other links are in a self-loop state is detected, if the other links are detected to be in a non-self-loop state, the other links are switched to the other links in a normal state, and the other links provide the reference clock source for the base station.
The method further comprises the following steps:
the base station is configured with a main link and one or more standby links for providing a reference clock source.
The step A comprises the following steps:
the system periodically or periodically detects the physical connection and logical connection state of the main link providing the reference clock source.
The step B comprises the following steps:
when the link providing the reference clock source fails, the system detects the physical connection and logical connection states of the standby link, switches to the available link according to the detection result, and provides the reference clock source for the base station by the available link. .
The step B comprises the following steps:
the system detects whether a self-loop state exists in a link capable of being switched in the physical connection of the standby link, and determines that the link is unavailable when the self-loop state is determined;
and/or the presence of a gas in the gas,
the system detects whether a self-loop state exists in a switchable link in the logic state of the standby link, and determines that the self-loop state is unavailable when the self-loop state is determined.
The step B comprises the following steps:
when the link providing the reference clock source fails and the system is not detected to have a usable standby link, the system periodically detects the state of each link in the system, and when the link in the normal state is detected, the link in the normal state is used for providing the reference clock source for the base station.
The step B comprises the following steps:
after periodically detecting that a standby link capable of providing a reference clock source exists in the system, the system immediately switches the link providing the reference clock source to the standby link in a normal state;
or,
when the system detects a plurality of standby links in a normal state, one standby link is selected according to a set condition, and the link providing the reference clock source is switched to the selected standby link.
The step B also comprises the following steps:
when detecting that the link providing the reference clock source fails, switching to the standby link in the normal state immediately, or switching to the standby link in the normal state when the link providing the reference clock source is still in the failure state after a preset time.
The step B comprises the following steps:
and C, after the link of the reference clock source provided by the system is successfully switched, executing the step A.
The invention provides a realizing device for improving clock source stability, which comprises:
a link detection module: the link switching module is used for detecting the state of a link of a reference clock source provided by a system, detecting whether other links are in a self-loop state when the link fails, and informing the link switching module when other links are in a non-self-loop state;
a link switching module: the reference clock source is switched to other links which are in normal working state and do not provide the reference clock source, and the reference clock source is provided by the other links.
The device further comprises:
and the timer has the duration of a set detection period of the link detection module, and when the timer is overtime, the link detection module is triggered and timing is restarted.
The device further comprises:
the standby link detection triggering module: and the link detection module is used for triggering the link detection module to detect the standby link when the main link is determined to have a fault, and informing the link switching module of the detection result.
The technical scheme provided by the invention can show that the method provided by the invention can detect a plurality of links, and can timely switch to a link which normally works to provide a reference clock source for the base station when the IUB clock link fails, such as high error code, frequent flash and physical layer failure of the physical link, so that the base station can continuously and normally work.
In addition, in the process of switching the link providing the IUB clock source, whether the new link exists in the states of physical, logical self-loop and other links can be effectively distinguished, the communication quality and the state of the new link are judged, the link which is in the logical loop state, the physical loop state or the high error code state is prevented from being switched, the possibility of misoperation caused by untimely switching of the IUB clock link and human factors is avoided, and the automatic switching process of the IUB clock link is completed.
Drawings
FIG. 1 is a flow chart of an embodiment of a method provided by the present invention;
fig. 2 is a schematic diagram of a specific implementation structure of the apparatus provided by the present invention.
Detailed Description
The core idea of the invention is that when the link providing IUB clock source is failed, the link is automatically switched to the link in normal state, and the link provides IUB clock source. When the system is automatically switched, the states of other links can be detected, whether the switched new link is a self-loop link or not can be distinguished, the states of a plurality of links can be distinguished, and the link which normally works can be found.
Specifically, after the user sets the clock source of the base station as the IUB clock source, the system detects the E1 link state providing the IUB clock source and takes corresponding measures, which are specifically as follows:
1. if the state of the link is normal, the state of the link is periodically detected.
2. If the link fails, whether other available links exist on the base station is detected, and the link is required to be in a non-user self-loop or a non-physical self-loop.
3. If there is an available link, the user-configured IUB clock source is automatically switched to the available link.
4. If the system does not currently have a link available, the system continues to detect links in the system until a link in a normal state is found and switched to.
In summary, the system detects the link providing the IUB clock source, and when the link fails, the system can automatically switch to the link in the normal state, so as to provide the IUB clock source.
For further understanding of the present invention, the following will describe the implementation method of the present invention in detail with reference to the drawings, and the processing flow thereof is shown in fig. 1. The method comprises the following specific steps:
step 11: the user sets up a link that provides the base station with a clock source of the IUB.
Step 12: the system periodically or periodically checks the status of the link.
The system detects the link periodically or periodically, so that the system can find the fault of the link in time and take corresponding treatment measures;
the period of the periodic detection can be set according to the requirement, if the maintainer considers that the link of the recent system works unstably, the time period can be set to be shorter so as to obtain the link state information in time, and the system detection only judges whether the physical connection and the logic connection state of the link in the system accord with the link state of providing the clock source.
The system detects whether the physical connection of the link providing the clock source has faults such as broken link or high error code. If the link is physically broken, the system can report an alarm, and the fault state of the link is easily obtained. If the link has high error codes, the system prompt or the instrument test can know that the error codes exist.
In addition, the logical connection of the clock source providing link needs to be detected, for example, the logical connection is not normal due to misoperation of maintenance personnel.
Step 13: and judging whether the link state is in a normal state, for example, abnormal states such as high bit error, frequent flash, physical layer failure and the like may occur on a physical link providing a clock source to the base station, if so, executing step 12, and continuing to detect the link, otherwise, executing step 14.
Step 14: the system detects the state of other links existing in the system, and searches for the link in a normal state, namely, the link is in a link normal state such as non-user self-loop, non-physical self-loop and the like. The system-on-link detection is as follows:
1. implementing link physical connection detection for system configuration links
Whether the physical connection of the system configuration link meets the basic condition of the physical connection serving as the link providing the clock source is detected, namely abnormal states such as broken link, frequent flash, physical layer fault and the like do not exist. If the basic condition is satisfied, the link is regarded as a link to be transferred, namely the link may provide an IUB clock source for the base station, otherwise, the link configured in the system is continuously detected;
in this step, the physical link detection and the implementation of step 12 are the same, but in step 14, multiple lines existing in the system need to be detected, and a link to be transferred is selected.
2. Realizing state detection of link to be transferred in system
After determining the link to be transferred in the 1 st detection process, further performing state detection on the link to further determine whether the link conforms to the state of a link providing a clock source, and the link cannot be finally used as a link providing a clock source for a base station;
the link state detection mainly comprises the following steps: whether the link is in link states such as non-physical self-loop, non-logical self-loop and the like is judged, and whether the state of the link to be transferred really accords with the link state of providing a clock reference source for the base station is judged. If the user sets the logical loop of transmission on the NodeB, the system can also acquire the logical loop-back state of the link.
Under the condition of solving whether the new link is in a physical self-loop or a logic self-loop, the judgment of the state of the new link is realized, and the link meeting the condition of providing the clock source link is selected.
By the method, a plurality of links existing in the system are detected, the links which work normally and can be used are searched as much as possible, and the automatic switching process of the IUB clock source links is ensured to be completed. By adopting the method, the situation that when the links existing in the system are detected, the usable links exist in the system but the clock source cannot be switched due to the fact that the usable links do not exist in the system is judged because the usable links are not detected can be avoided.
Step 15: whether the system finds a link with a normal state, if so, executing a step 16, otherwise, executing a step 12;
if the system does not have an available link at present, the base station works in a free oscillation working state; meanwhile, whether a link in a normal state exists in the system is detected, and once the link in the normal state is found, switching of the IUB clock source link is carried out, so that the link can provide a normal IUB clock source;
step 16: the link of the IUB clock source is switched to the link in a normal state, and step 12 is executed to detect the link state of the newly provided IUB clock source.
If the system currently has a link with a normal state, the specific switching process is as follows:
1. if the system only finds one available link, switching the IUB clock source link;
2. the system finds a plurality of available standby links, and selects one of the standby links to switch according to set conditions; maintenance personnel can set the switching condition of the IUB clock source link according to the actual situation, and the set condition can be link state information or link switching time information and the like;
3. the system detects the standby link in a normal state, at the moment, the system detects that the state of the link currently providing the IUB clock source is changed into a normal state, and whether switching is carried out or not is selected according to set conditions;
for example, a timer is set, if the main link recovers to a normal state within the time limited by the timer, the switching is not performed, otherwise, the switching is performed;
or, considering that the recent working state of the link is unstable, if the link continues to be used and a failure may also occur, the condition for switching may be set as the communication quality of the link, for example, the condition is the bit error rate of the link, if the bit error rate of the other non-IUB clock source link is lower than the bit error rate of the IUB clock source link, the link is switched to the other non-IUB clock source link, otherwise, the link is not switched.
In order to implement the method of the present invention well, the present invention also includes a device corresponding to the entity, which can be disposed in the base station or the base station controller, and the device is suggested to be disposed in the base station controller in view of the convenience of maintenance.
As shown in fig. 2, the apparatus includes a link detection module and a link switching module, wherein the link detection module is further connected to a timer, and the link detection module further includes a standby link detection triggering module. The link detection module is configured to detect a state of the main link, that is, detect a state of a link providing a clock source, and specifically, perform periodic detection on the main link under control of the timer. When the link fails, the standby link detection triggering module triggers the link detection module to detect the state of the standby link, and when the standby link in the normal working state is found, the link detection module informs the link switching module to switch.
Each module is described in detail below, specifically as follows:
a link detection module: the system detects the state of a link providing a reference clock source, and when the link fails, the system informs a link switching module;
a timer: the duration of the timer is the set detection period of the link detection module, when the timer is overtime, the link detection module is triggered to carry out periodic detection, and timing is restarted;
the standby link detection triggering module: the link detection module is used for detecting the standby link by triggering the link detection module when the main link is determined to have a fault, and informing the link switching module of the detection result;
a link switching module: and switching the reference clock source to a link which is in a normal working state and does not provide the reference clock source, and providing the reference clock source by the link.
In summary, the method provided by the present invention can automatically switch to the link with normal working state when the link providing the clock source fails, and continue to provide the normal clock source, thereby improving the reliability of the system operation and ensuring the capability of the system to continuously provide reliable services.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (12)
1. An implementation method for improving clock source stability is characterized by comprising the following steps:
A. the system detects the state of a link providing a reference clock source for a base station;
B. when the link providing the reference clock source fails, whether other links are in a self-loop state is detected, if the other links are detected to be in a non-self-loop state, the other links are switched to the other links in a normal state, and the other links provide the reference clock source for the base station.
2. The method according to claim 1, wherein the method further comprises:
the base station is configured with a main link and one or more standby links for providing a reference clock source.
3. The method according to claim 1, wherein the step a includes:
the system periodically or periodically detects the physical connection and logical connection state of the main link providing the reference clock source.
4. A method as claimed in claim 1, 2 or 3, wherein said step B includes:
when the link providing the reference clock source fails, the system detects the physical connection and logical connection states of the standby link, switches to the available link according to the detection result, and provides the reference clock source for the base station by the available link.
5. The method according to claim 4, wherein the step B includes:
the system detects whether a self-loop state exists in a link capable of being switched in the physical connection of the standby link, and determines that the link is unavailable when the self-loop state is determined;
and/or the presence of a gas in the gas,
the system detects whether a self-loop state exists in a switchable link in the logic state of the standby link, and determines that the self-loop state is unavailable when the self-loop state is determined.
6. The method according to claim 4, wherein the step B includes:
when the link providing the reference clock source fails and the system is not detected to have a usable standby link, the system periodically detects the state of each link in the system, and when the link in the normal state is detected, the link in the normal state is used for providing the reference clock source for the base station.
7. The method according to claim 6, wherein the step B includes:
after periodically detecting that a standby link capable of providing a reference clock source exists in the system, the system immediately switches the link providing the reference clock source to the standby link in a normal state;
or,
when the system detects a plurality of standby links in a normal state, one standby link is selected according to a set condition, and the link providing the reference clock source is switched to the selected standby link.
8. The method according to claim 4, wherein the step B further includes:
when detecting that the link providing the reference clock source fails, switching to the standby link in the normal state immediately, or switching to the standby link in the normal state when the link providing the reference clock source is still in the failure state after a preset time.
9. A method as claimed in claim 1, 2 or 3, wherein said step B includes:
and C, after the link of the reference clock source provided by the system is successfully switched, executing the step A.
10. An implementation device for improving clock source stability. It is characterized by comprising:
a link detection module: the link switching module is used for detecting the state of a link of a reference clock source provided by a system, detecting whether other links are in a self-loop state when the link fails, and informing the link switching module when other links are in a non-self-loop state;
a link switching module: the reference clock source is switched to other links which are in normal working state and do not provide the reference clock source, and the reference clock source is provided by the other links.
11. The apparatus according to claim 10, wherein the apparatus further comprises:
and the timer has the duration of a set detection period of the link detection module, and when the timer is overtime, the link detection module is triggered and timing is restarted.
12. An implementation apparatus for improving clock source stability according to claim 10 or 11, wherein the apparatus further comprises:
the standby link detection triggering module: and the link detection module is used for triggering the link detection module to detect the standby link when the main link is determined to have a fault, and informing the link switching module of the detection result.
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| CNB2006100016575A CN100442903C (en) | 2006-01-20 | 2006-01-20 | Realization method and device for improving clock source stability |
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| CNB2006100016575A CN100442903C (en) | 2006-01-20 | 2006-01-20 | Realization method and device for improving clock source stability |
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| CN1867151A CN1867151A (en) | 2006-11-22 |
| CN100442903C true CN100442903C (en) | 2008-12-10 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100551104C (en) * | 2007-03-12 | 2009-10-14 | 华为技术有限公司 | Iub interface business transmitting method and device based on the IP transmission |
| CN102035638B (en) * | 2009-09-25 | 2014-09-03 | 华为技术有限公司 | Clock source selection processing method, device and system |
| CN101909316B (en) * | 2010-08-17 | 2015-05-20 | 中兴通讯股份有限公司 | Operation maintenance method and system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995024801A2 (en) * | 1994-03-01 | 1995-09-14 | Nokia Telecommunications Oy | Hierarchical synchronization method |
| CN1159263A (en) * | 1995-07-26 | 1997-09-10 | 诺基亚电信公司 | Apparatus and method for synchronizing base sites individually in communication system |
| CN1421075A (en) * | 1999-12-22 | 2003-05-28 | 艾利森电话股份有限公司 | Telecommunication network synchronisation |
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2006
- 2006-01-20 CN CNB2006100016575A patent/CN100442903C/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995024801A2 (en) * | 1994-03-01 | 1995-09-14 | Nokia Telecommunications Oy | Hierarchical synchronization method |
| CN1159263A (en) * | 1995-07-26 | 1997-09-10 | 诺基亚电信公司 | Apparatus and method for synchronizing base sites individually in communication system |
| CN1421075A (en) * | 1999-12-22 | 2003-05-28 | 艾利森电话股份有限公司 | Telecommunication network synchronisation |
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