CN102256281A - Method, system and device for confirming omitted adjacent cell in mobile communication system - Google Patents
Method, system and device for confirming omitted adjacent cell in mobile communication system Download PDFInfo
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Abstract
The invention provides a method, a system and a device for confirming an omitted adjacent cell in a mobile communication system. The method comprises the following steps: a network side acquires the geographical position information of adjacent base stations of a cell and the direction angle information of all cells in the base stations, and then confirms the omitted adjacent cell of the cell according to the geographical position information and the direction angle information. The method provided by the invention can be used for promoting the efficiency of confirming the omitted adjacent cell and ensuring the accuracy for confirming the omitted adjacent cell.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to the mthods, systems and devices of the miss-configured neighboring cells in a kind of definite mobile communication system.
Background technology
In mobile communication system, some sub-district occurs through regular meeting and should be configured to this adjacent cells of cells, but leak the situation of joining for a certain reason, leaked the miss-configured neighboring cells that this sub-district is called for short in the sub-district of joining.Problems such as call drop or handover influenced communication quality when the phenomenon of miss-configured neighboring cells will cause switching.
Along with the development of mobile communication technology, operations such as newly-increased base station and resettlement base station will be more and more frequent, corresponding the changing of neighboring BS relationship meeting in the mobile communication system, and the phenomenon that causes the adjacent area leakage to be joined is more general.
At present, leak the phenomenon of joining for the adjacent area, by the method for drive test, whether artificial cognition has miss-configured neighboring cells, and which sub-district belongs to miss-configured neighboring cells usually.
Thisly determine that by drive test the method for miss-configured neighboring cells need consume lot of manpower and material resources, efficient is lower.
Summary of the invention
In view of this, the invention provides the mthods, systems and devices of the miss-configured neighboring cells in a kind of definite mobile communication system, improving the efficient of determining miss-configured neighboring cells, and guarantee to determine the accuracy of miss-configured neighboring cells.
Technical scheme of the present invention specifically is achieved in that
The method of the miss-configured neighboring cells in a kind of definite mobile communication system, this method comprises:
Network side obtains the deflection information of each sub-district under the geographical location information of adjacent base station of this sub-district and this adjacent base station;
Network side is determined the miss-configured neighboring cells of this sub-district according to described geographical location information and described deflection information.
The system of the miss-configured neighboring cells in a kind of definite mobile communication system, this system comprise base station and definite equipment;
Described base station is used for the deflection information of each sub-district under the geographical location information of this base station and this base station is reported described definite equipment;
Described definite equipment is used for determining according to described geographical location information and described deflection information the miss-configured neighboring cells of this sub-district.
The device of the miss-configured neighboring cells in a kind of definite mobile communication system, this device comprises information acquisition module and determination module;
Described information acquisition module obtains the deflection information of each sub-district under the geographical location information of adjacent base station of this sub-district and this adjacent base station;
Described determination module is determined the miss-configured neighboring cells of this sub-district according to described geographical location information and described deflection information.
By such scheme as seen, technical scheme provided by the invention by obtaining adjacent base station geographical location information and this adjacent base station under the deflection information of each sub-district, determine the miss-configured neighboring cells of this sub-district according to this geographical location information and deflection information, owing to do not need artificial drive test, therefore can improve the efficient of determining miss-configured neighboring cells greatly, in addition, because the present invention is when determining miss-configured neighboring cells, not only considered the geographical position of other sub-districts, also consider the deflection information of other sub-districts, therefore can guarantee to determine the accuracy of miss-configured neighboring cells.
Description of drawings
Fig. 1 is the method flow diagram of the miss-configured neighboring cells in definite mobile communication system provided by the invention.
Fig. 2 is the detail flowchart of the method for the miss-configured neighboring cells in definite mobile communication system provided by the invention.
Fig. 3 is that this sub-district provided by the invention is adjacent the relative position schematic diagram between the base station.
Fig. 4 is a method flow diagram of choosing the sub-district that can list Neighboring Cell List 3 to be compared in.
Fig. 5 is that the system of the miss-configured neighboring cells in definite mobile communication system provided by the invention forms schematic diagram.
Fig. 6 is the apparatus structure schematic diagram of the miss-configured neighboring cells in definite mobile communication system provided by the invention.
Embodiment
The present invention is described in detail below in conjunction with accompanying drawing.
Fig. 1 is the method flow diagram of the miss-configured neighboring cells in definite mobile communication system provided by the invention.
As shown in Figure 1, this method comprises:
Step 101, network side are obtained the deflection information of each sub-district under the geographical location information of adjacent base station of this sub-district and this adjacent base station.
Wherein, the deflection information of each sub-district can be obtained from the base station parameter information of storage in advance by network side under the geographical location information of adjacent base station and this adjacent base station, also can report network side by this adjacent base station.Geographical location information and sub-district deflection information that the mode that the mode that is reported network side by adjacent base station is obtained from the base station parameter information of storage in advance than network side obtains are more accurate, are the optimal ways that the present invention recommends.
The present invention by take all factors into consideration with this sub-district under distance on the geographical position of each sub-district under the adjacent base station, base station and this sub-district, and the deflection of each sub-district of adjacent base station, improve the accuracy of determining miss-configured neighboring cells, promptly, for and this sub-district between the less sub-district of distance, can not consider its deflection and with its miss-configured neighboring cells as this sub-district, and for the sub-district far away with the distance of this sub-district, then need to consider its deflection information, thereby avoid and to be defined as the miss-configured neighboring cells of this sub-district with the opposing sub-district of the distant and deflection of this sub-district distance and the deflection of this sub-district.
Fig. 2 is the detail flowchart of the method for the miss-configured neighboring cells in definite mobile communication system provided by the invention.
As shown in Figure 2, this method comprises:
In this step, the latitude and longitude information (being geographical location information) of all sub-districts that network side reports according to network engineering parameter table (being the base station parameter information of network side storing) or base station is calculated this sub-district and has been the average distance value average (D of the adjacent sub-district of this cell configuration
1... .D
n), determine typical station spacing maximum D according to this sub-district environment of living in
Typical, with average (D
1... D
n) and D
TypicalBetween maximum, i.e. D
Max=max{average (D
1... D
n), D
TypicalBe defined as the maximum adjacent area range limit value of this sub-district, that is, the distance between this sub-district and its adjacent sub-district can not be greater than D
Max
Sub-district in the Neighboring Cell List to be compared wherein is the sub-district that possible be confirmed as the miss-configured neighboring cells of this sub-district.
In this step, will directly list Neighboring Cell List to be compared in the closer sub-district of the distance of this sub-district, particularly:
At first the into Neighboring Cell List to be compared 1 of this sub-district is added in other sub-districts identical with the longitude and latitude of this sub-district.Sub-district in the Neighboring Cell List 1 to be compared is other sub-districts under the base station under this sub-district, usually, all sub-districts in the Neighboring Cell List 1 to be compared all need be configured to this adjacent cells of cells.
Determine typical station spacing minimum value D according to this sub-district environment of living in
Min, determine the geographical location information of each sub-district according to the network engineering parameter table, will with the distance of this sub-district less than this typical case's station spacing minimum value D
MinThe sub-district list Neighboring Cell List 2 to be compared in.
Preferably, can according to the distance order from the close-by examples to those far off of this sub-district successively will with the distance of this sub-district less than typical station spacing minimum value D
MinThe sub-district be arranged in the Neighboring Cell List 2 to be compared, wherein forward more its priority of sub-district in position is high more in Neighboring Cell List 2 to be compared, for a plurality of sub-districts identical with the distance of this sub-district, can be in Neighboring Cell List 2 between these a plurality of sub-districts according to the ascending order of sub-district ID or random alignment.This operation of giving priority for the sub-district also can be carried out in step 204.
This step at be that distance with this sub-district is greater than described typical station spacing minimum value D
MinAnd be not more than D
MaxThe sub-district, therefore the distance of these sub-districts and this sub-district is far away, needs to consider its deflection information, if opposing with the deflection of this sub-district, the angle that perhaps departs from is bigger, then can corresponding sub-district not listed in Neighboring Cell List 3 to be compared.Specifically see also hereinafter Fig. 3 and Fig. 4 for example.
In this step, give limit priority with the sub-district in the Neighboring Cell List 1 to be compared, time high priority is given in the sub-district in the Neighboring Cell List 2 to be compared, and the priority of the sub-district in the Neighboring Cell List 3 to be compared is minimum.
In each Neighboring Cell List to be compared,, give from high to low priority successively according to order from the close-by examples to those far off again according to the distance of each sub-district and this sub-district in this tabulation.
Action in this step also can form Neighboring Cell List 1,2 to be compared and carry out respectively in 3 o'clock, at this moment cancellation step 204.
In this step, if what the total number in sub-district in the matched adjacent zone of this sub-district and Neighboring Cell List to be compared 1,2 and 3 surpassed system's permission is the adjacent area number higher limit of this cell configuration, then can directly all sub-districts in Neighboring Cell List 1,2 to be compared and 3 all be reported network management center according to priority, network management center all presents to the operation maintenance personnel with these sub-districts, and the operation maintenance personnel can be added to this adjacent cells of cells with these sub-districts.
Be the adjacent area number higher limit of this cell configuration if the total number in sub-district in the matched adjacent zone of this sub-district and Neighboring Cell List to be compared 1,2 and 3 has surpassed that system allows, then network management center not only presents to the operation maintenance personnel with the sub-district in Neighboring Cell List 1,2 to be compared and 3, but also the cell ID that will surpass adjacent area number higher limit after will sorting from high to low according to priority comes out to present to the operation maintenance personnel, by the operation maintenance personnel selection which sub-district is added to this adjacent cells of cells.
Below in conjunction with Fig. 3 and Fig. 4 the method for choosing the sub-district that can list Neighboring Cell List 3 to be compared in is carried out exemplary illustration.
For convenience of description, the term that will use following embodiment defines, and sees also Fig. 3.
Fig. 3 is that this sub-district provided by the invention is adjacent the relative position schematic diagram between the base station, and this sub-district wherein promptly is the sub-district that is examined among Fig. 3.
Definition about quadrant: the geographical position with place, base station under this sub-district is the origin of coordinates, with direct north is 0 degree, in the time of will adopting right-handed coordinate system to turn clockwise, be designated as first quartile more than or equal to 0 degree and less than 90 zones of spending, be designated as second quadrant more than or equal to 90 degree and less than 180 zones of spending, be designated as third quadrant more than or equal to 180 degree or less than 270 zones of spending, be designated as four-quadrant more than or equal to 270 degree and less than 360 zones of spending.
The sub-district direction angle alpha
iDefinition: with positive northern 0 the degree direction is start line, in the time of will adopting right-handed coordinate system to turn clockwise, the angle of each main lobe of antenna and this start line is designated as the direction angle alpha of each sub-district under this base station respectively
i
The definition of reference line: the line between this base station, place, sub-district and the adjacent base station is designated as reference line.
The definition of reference angle: will begin to rotate to positive northern 0 angle of spending direction from described reference line and be defined as the reference angle β of this adjacent base station with respect to this sub-district according to right hand clockwise direction.
The direction angle alpha of each sub-district under reference line and the adjacent base station
iBetween the definition of angle: with reference angle β and sub-district direction angle alpha
iAddition if gained and value are not more than 180 degree, is defined as this reference line and this sub-district direction angle alpha with this gained and value
iBetween angle, if gained and value greater than 180 degree, are defined as this reference line and this sub-district direction angle alpha with the absolute value of this gained and value and 360 differences of spending
iBetween angle.
Fig. 4 is a method flow diagram of choosing the sub-district that can list Neighboring Cell List 3 to be compared in.
As shown in Figure 4, this method comprises:
Step 401, network side are obtained the geographical location information and the deflection information of each base station.
Step 402, network side are judged the residing quadrant in this sub-district, when being in first quartile or four-quadrant, and execution in step 403, when being in second quadrant, execution in step 404, when being in third quadrant, execution in step 405.
Step 403 judges whether the adjacent base station of this sub-district is in first quartile or four-quadrant, if, execution in step 406, otherwise execution in step 407.
Step 404 judges whether the adjacent base station of this sub-district is in the first quartile or second quadrant, if, execution in step 406, otherwise execution in step 407.
Step 405 judges whether the adjacent base station of this sub-district is in third quadrant or four-quadrant, if, execution in step 406, otherwise execution in step 407.
Step 406 is added Neighboring Cell List 3 into to be compared, process ends with minimum and inferior two the little sub-districts of the angle between the reference line of sub-district deflection and this adjacent base station in each sub-district of this adjacent base station.
Step 407 is added Neighboring Cell List 3 into to be compared, process ends with the sub-district of the angle minimum between the reference line of sub-district deflection and this adjacent base station in each sub-district of this adjacent base station.
The present invention is before doing the miss-configured neighboring cells inspection, can also judge whether checked network is the floored community network earlier, if, what then at first will be in same layer divides into one group for a short time, determine of the to be compared miss-configured neighboring cells tabulation of this sub-district according to the described method of Fig. 1～Fig. 4 at each layer, give different priority for the miss-configured neighboring cells to be compared tabulation of different layers then, determine the miss-configured neighboring cells of this sub-district according to the priority of each sub-district in the tabulation of miss-configured neighboring cells to be compared.Wherein, be generally to be positioned at the miss-configured neighboring cells to be compared tabulation of layer and give the highest priority with this sub-district, perhaps give the highest priority, for minimum priority is given in the miss-configured neighboring cells to be compared tabulation that is positioned at the bottom for being positioned at top miss-configured neighboring cells to be compared tabulation.
The present invention also provides the system of the miss-configured neighboring cells in a kind of definite mobile communication system, sees also Fig. 5.
Fig. 5 is that the system of the miss-configured neighboring cells in definite mobile communication system provided by the invention forms schematic diagram.
As shown in Figure 5, this system comprises base station 501 and definite equipment 502.
Determine equipment 502, be used for determining the miss-configured neighboring cells of this sub-district according to described geographical location information and described deflection information.
The present invention also provides the device of the miss-configured neighboring cells in a kind of definite mobile communication system, sees also Fig. 6.
Fig. 6 is the apparatus structure schematic diagram of the miss-configured neighboring cells in definite mobile communication system provided by the invention.
As shown in Figure 6, this device comprises information acquisition module 601 and determination module 602.
Wherein, system shown in Figure 5 and device shown in Figure 6 determine that the concrete grammar of miss-configured neighboring cells can be referring to Fig. 1～method shown in Figure 4, can according to actual needs the equipment among Fig. 5 and Fig. 6 be divided into the corresponding actions that concrete functional module is used for execution graph 1～Fig. 4, to determine miss-configured neighboring cells.
As seen, adopt the present invention automatic inspection to go out miss-configured neighboring cells, thereby greatly reduce human cost and the time cost of finding miss-configured neighboring cells, and, the present invention is not limited by the standard of mobile communication system, so long as mobile communication system can adopt this method to solve the adjacent area and leak the problem of joining.Use the present invention can also develop network planning tool, significant to providing services on the Internet.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (13)
1. the method for the miss-configured neighboring cells in the definite mobile communication system is characterized in that this method comprises:
Network side obtains the deflection information of each sub-district under the geographical location information of adjacent base station of this sub-district and this adjacent base station;
Network side is determined the miss-configured neighboring cells of this sub-district according to described geographical location information and described deflection information.
2. method according to claim 1 is characterized in that, the deflection information that described network side obtains each sub-district under the geographical location information of adjacent base station of this sub-district and this adjacent base station comprises:
Network side receives the deflection information of each sub-district under the geographical location information of this adjacent base station that the adjacent base station of this sub-district reports and/or this adjacent base station;
Perhaps, network side is inquired about the deflection information of each sub-district under the geographical location information of this adjacent base station and/or this adjacent base station according to the adjacent base station parameter information of this sub-district of storage in advance.
3. method according to claim 1 is characterized in that, network side all is defined as the residing geographical position of this adjacent base station with the geographical position of each sub-district under the adjacent base station;
Described network side determines that according to described geographical location information and described deflection information the miss-configured neighboring cells of this sub-district comprise:
In first preset range, and the sub-district that the difference of the deflection of deflection and this sub-district satisfies predetermined condition is defined as first miss-configured neighboring cells to be compared to network side with the distance in the geographical position of geographical position of living in and this sub-district;
Network side is determined the miss-configured neighboring cells of this sub-district from described first miss-configured neighboring cells to be compared.
4. method according to claim 3 is characterized in that,
Geographical position with place, base station under this sub-district is the origin of coordinates, with direct north is 0 degree, in the time of will adopting right-handed coordinate system to turn clockwise, be designated as first quartile more than or equal to 0 degree and less than 90 zones of spending, be designated as second quadrant more than or equal to 90 degree and less than 180 zones of spending, be designated as third quadrant more than or equal to 180 degree or less than 270 zones of spending, be designated as four-quadrant more than or equal to 270 degree and less than 360 zones of spending;
With positive northern 0 degree direction is start line, and in the time of will adopting right-handed coordinate system to turn clockwise, the angle of each main lobe of antenna and this start line is designated as the deflection of each sub-district under this base station respectively,
Line between this base station, place, sub-district and the adjacent base station is designated as reference line, calculates the angle between the deflection of each sub-district under this reference line and this adjacent base station;
When this sub-district was positioned at described first quartile or described four-quadrant and adjacent base station and is positioned at first quartile or four-quadrant, minimum and time two little sub-districts were defined as first miss-configured neighboring cells to be detected with the angle between deflection under this adjacent base station and the described reference line;
When this sub-district is positioned at described first quartile or described four-quadrant and adjacent base station and is positioned at second quadrant or third quadrant, the sub-district of the angle minimum between deflection under this adjacent base station and the described reference line is defined as first miss-configured neighboring cells to be detected;
When this sub-district was positioned at described second quadrant and adjacent base station and is positioned at the first quartile or second quadrant, minimum and time two little sub-districts were defined as first miss-configured neighboring cells to be detected with the angle between deflection under this adjacent base station and the described reference line;
When this sub-district is positioned at described second quadrant and adjacent base station and is positioned at third quadrant or four-quadrant, the sub-district of the angle minimum between deflection under this adjacent base station and the described reference line is defined as first miss-configured neighboring cells to be detected;
When this sub-district was positioned at described third quadrant and adjacent base station and is positioned at third quadrant or four-quadrant, minimum and time two little sub-districts were defined as first miss-configured neighboring cells to be detected with the angle between deflection under this adjacent base station and the described reference line;
When this sub-district is positioned at described third quadrant and adjacent base station and is positioned at the first quartile or second quadrant, the sub-district of the angle minimum between deflection under this adjacent base station and the described reference line is defined as first miss-configured neighboring cells to be detected.
5. method according to claim 4 is characterized in that, the angle under this reference line of described calculating and this adjacent base station between the deflection of each sub-district comprises:
To begin to rotate to positive northern 0 angle of spending direction from described reference line and be defined as the reference angle β of this adjacent base station with respect to this sub-district according to right hand clockwise direction,
With reference angle β and sub-district deflection addition, if gained and value are not more than 180 degree, this gained and value are defined as angle between this reference line and this sub-district deflection, if gained and value be greater than 180 degree, the absolute value of this gained and value and 360 differences of spending is defined as angle between this reference line and this sub-district deflection.
6. method according to claim 3 is characterized in that, this method further comprises:
In other sub-districts under this sub-district under the base station, network side is defined as second miss-configured neighboring cells to be compared of this sub-district with the current sub-district that is not configured to this adjacent cells of cells;
Network side is determined the miss-configured neighboring cells of this sub-district from described second miss-configured neighboring cells to be compared.
7. method according to claim 6 is characterized in that,
The sub-district geographical location information of network side basis storage in advance or the sub-district geographical location information that the base station reports, determine current each adjacent sub-district that has disposed, this sub-district and the average distance value between this this sub-district, determine maximum typical station spacing and minimum typical station spacing value according to sub-district environment of living in, the typical station spacing value of described minimum is defined as the lower limit of described first preset range, the maximum in described average distance value and the described maximum typical station spacing value is defined as the higher limit of described first preset range.
8. method according to claim 7 is characterized in that, this method further comprises:
The sub-district geographical location information of network side basis storage in advance or the sub-district geographical location information that the base station reports will be defined as the 3rd miss-configured neighboring cells to be compared of this sub-district with the distance of this sub-district less than the sub-district of the typical station spacing value of described minimum;
Network side is determined the miss-configured neighboring cells of this sub-district from the 3rd miss-configured neighboring cells to be compared.
9. method according to claim 8 is characterized in that,
Whether the number sum that network side is judged the number of number, second miss-configured neighboring cells to be compared of adjacent area number that this sub-district disposed, first miss-configured neighboring cells to be compared and the 3rd miss-configured neighboring cells to be compared is greater than the adjacent area number threshold value of this sub-district, if, from described first miss-configured neighboring cells to be compared, second miss-configured neighboring cells to be compared and the 3rd miss-configured neighboring cells to be compared, select the miss-configured neighboring cells of part sub-district as this sub-district, if not, with described first miss-configured neighboring cells to be compared, second miss-configured neighboring cells to be compared and the 3rd miss-configured neighboring cells to be compared all as the miss-configured neighboring cells of this sub-district.
10. method according to claim 9 is characterized in that, selects the part sub-district to comprise as the miss-configured neighboring cells of this sub-district from described first miss-configured neighboring cells to be compared, second miss-configured neighboring cells to be compared and the 3rd miss-configured neighboring cells to be compared:
The second all miss-configured neighboring cells to be compared are defined as the miss-configured neighboring cells of this sub-district;
According to the distance order from the close-by examples to those far off with this sub-district is that first miss-configured neighboring cells to be compared and the 3rd miss-configured neighboring cells to be compared are given priority from high to low successively, the part sub-district in described first miss-configured neighboring cells to be compared and the 3rd miss-configured neighboring cells to be compared is defined as the miss-configured neighboring cells of this sub-district according to the adjacent area number threshold value of described priority and this sub-district.
11. according to the described method of arbitrary claim among the claim 1-10, it is characterized in that, when the sub-district in this mobile communication system is floored community, the miss-configured neighboring cells to be compared that network side is determined this sub-district according to the geographical location information and the described deflection information of each sub-district and this sub-district in each layer, according to the residing number of plies in this sub-district and the residing number of plies of determining in miss-configured neighboring cells to be compared and the distance of miss-configured neighboring cells to be compared and this sub-district, give priority for each miss-configured neighboring cells to be compared, determine miss-configured neighboring cells according to the priority of each miss-configured neighboring cells to be compared.
12. the system of the miss-configured neighboring cells in the definite mobile communication system is characterized in that this system comprises base station and definite equipment;
Described base station is used for the deflection information of each sub-district under the geographical location information of this base station and this base station is reported described definite equipment;
Described definite equipment is used for determining according to described geographical location information and described deflection information the miss-configured neighboring cells of this sub-district.
13. the device of the miss-configured neighboring cells in the definite mobile communication system is characterized in that this device comprises information acquisition module and determination module;
Described information acquisition module obtains the deflection information of each sub-district under the geographical location information of adjacent base station of this sub-district and this adjacent base station;
Described determination module is determined the miss-configured neighboring cells of this sub-district according to described geographical location information and described deflection information.
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| CN102572770A (en) * | 2011-12-28 | 2012-07-11 | 中兴通讯股份有限公司 | Method and base station for adding omissively-configured adjacent domains |
| CN103634809A (en) * | 2013-12-13 | 2014-03-12 | 大唐移动通信设备有限公司 | Method and device for carrying out adjacent-cell checking on basis of geographic information of cells |
| CN104105105A (en) * | 2013-04-11 | 2014-10-15 | 普天信息技术研究院有限公司 | Method for determining proximity relation of neighbor cells |
| CN104640136A (en) * | 2015-01-13 | 2015-05-20 | 中国联合网络通信集团有限公司 | Neighbor cell configuration verification method and neighbor cell configuration verification device |
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| CN105578496A (en) * | 2014-10-14 | 2016-05-11 | 中国移动通信集团广东有限公司 | Adjacent cell optimization method and apparatus |
| CN105592508A (en) * | 2014-10-29 | 2016-05-18 | 中兴通讯股份有限公司 | Method and apparatus for establishing radio access network node adjacent cell relations |
| CN105636064A (en) * | 2014-10-29 | 2016-06-01 | 普天信息技术有限公司 | Method and system for planning adjacent cells |
| CN107450327A (en) * | 2017-09-15 | 2017-12-08 | 广州杰赛科技股份有限公司 | Self-adaptation control method, device and the emergency detection system of detecting devices |
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| CN1713764A (en) * | 2004-06-23 | 2005-12-28 | 大唐移动通信设备有限公司 | Detection of tight degree between zones and automatic detection of network problem |
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