CN107801220B - Method for automatically switching cell types and computer readable storage medium - Google Patents
Method for automatically switching cell types and computer readable storage medium Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
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- H—ELECTRICITY
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- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/34—Reselection control
- H04W36/38—Reselection control by fixed network equipment
- H04W36/385—Reselection control by fixed network equipment of the core network
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Abstract
The invention discloses a method for automatically switching cell types and a computer readable storage medium, wherein the method comprises the following steps: the source base station sends a switching request message to a core network; if the core network returns a switching response signaling message, judging that the cell type in the current adjacent cell is effective and storing the cell type; if the core network returns a switching preparation failure signaling message, judging whether the target base station number in the switching request message is wrong or not according to the switching preparation failure signaling message; if yes, switching the cell type of the current adjacent cell. The invention improves the problem of switching failure caused by the error of the cell type by selectively and automatically switching the cell type parameters in the adjacent cell, thereby improving the switching success rate.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method for automatically switching cell types and a computer-readable storage medium.
Background
With the development of the times, the mobile communication technology becomes the most widely used communication mode in daily life. Global 4G networks, represented by LTE networks, continue to increase, users are steadily growing, and the global 4G market has entered a rapid growth from the inception stage. The explosive growth of wireless mobile data services necessarily requires further enhancement of wireless coverage.
The operation and maintenance of wireless networks, along with the deployment of wireless networks, have existed for a long time. With the development of wireless networks, the difficulty of wireless operation and maintenance is getting larger and larger, and the workload of manual processing is exponentially increased, wherein the most labor-consuming work is to process the neighboring cell relation for cell switching. The normal handover of a cell is the main means for ensuring the service continuity of a mobile subscriber, which is a basic function of a cellular mobile communication system.
With the development of LTE, more and more base stations are provided, and complicated neighboring cell relations may cause cell missing and cell missing, resulting in handover failure and call drop, so that accurate neighboring cell relation configuration is a basic requirement for ensuring mobile network performance, and at the same time, excessively high operation cost additionally generated by neighboring cell planning work is an important point for an operator to consider, and therefore, it has a more important influence on an LTE system as to whether cell type parameters in an LTE neighboring cell that have been collected are correct, thereby effectively reducing the investment of labor and capital of the operator.
As shown in fig. 1, in an LTE system, when there are parameter variations, manual operation errors, newly opened stations, and other related scenarios between a cell and a macro station, an Automatic Neighbor cell collection operation using ANR (Automatic Neighbor Relation)/air interface synchronization and a manually configured manual Neighbor cell addition operation are used to collect a complete Neighbor cell list. The LTE signaling flow for triggering S1 handover needs to explicitly carry a target cell type, and when there is a cell type error in an automatically or manually configured neighbor cell parameter, an EPC (core network) cannot identify a target base station ID carried in a source base station triggering S1 handover signaling, and finally, S1 handover fails, which causes a call drop, affects user experience, and deteriorates S1 handover KPI (Key Performance Indicator) indicators.
Under the default configuration, the cell type of the macro station is macro by default, and the cell type of the indoor is home by default. The moving terminal 3 resides in the indoor sub-base station a, and in the neighboring cell parameters of the macro-base station collected by the indoor sub-base station a through automatic and manual methods, when the cell type is home, and in the process that the terminal 3 moves to the macro-base station, after the switching threshold is met, the cell type of the macro-base station of the target cell carried in the S1 switching flow triggered by the indoor sub-base station a is home, which will cause the core network to be unable to identify the target base station, and finally will cause the S1 switching failure. Otherwise, when the cell type of the target LTE base station is the home type and the cell type in the neighboring cell parameter of the target base station added by the source base station in error is the macro type, in the process of triggering S1 handover, the carried cell type error may also exist, which eventually results in that the core network cannot identify the target base station ID carried by the source base station, thereby affecting the handover.
The common practice in the industry is as follows:
1. and manually maintaining, namely manually modifying the cell types in the neighbor cell list. However, with the development of LTE wireless networks, especially the deployment of small cells, this approach becomes more difficult and more costly.
2. And automatically deleting the neighboring cell, and setting the neighboring cell as a blacklist or directly deleting the neighboring cell after the number of times of handover failure of the neighboring cell meets a threshold value by using an MRO (Mobility Robustness optimization) function of an SON (Self-Organized network). This will result in the mobile terminal causing signal degradation and even a dropped call, affecting the user experience.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a method for automatically switching cell types and a computer readable storage medium are provided, which can automatically switch cell types and improve the success rate of switching.
In order to solve the technical problems, the invention adopts the technical scheme that: a method of automatically switching cell types, comprising:
the source base station sends a switching request message to a core network;
if the core network returns a switching response signaling message, judging that the cell type in the current adjacent cell is effective and storing the cell type;
if the core network returns a switching preparation failure signaling message, judging whether the target base station number in the switching request message is wrong or not according to the switching preparation failure signaling message;
if yes, switching the cell type of the current adjacent cell.
The invention also relates to a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of:
the source base station sends a switching request message to a core network;
if the core network returns a switching response signaling message, judging that the cell type in the current adjacent cell is effective and storing the cell type;
if the core network returns a switching preparation failure signaling message, judging whether the target base station number in the switching request message is wrong or not according to the switching preparation failure signaling message;
if yes, switching the cell type of the current adjacent cell.
The invention has the beneficial effects that: triggering an S1 switching signaling process through a source base station, analyzing according to a switching message responded by a core network, selectively changing the cell parameter type in the neighbor cell list according to a failure value responded by the core network when the switching fails, and carrying the updated cell type in a subsequently triggered S1 switching signaling process, thereby realizing the maintenance of the cell type in the neighbor cell information of the base station. The invention verifies whether the cell type configuration of the adjacent cell is correct or not by triggering the S1 switching process for the collected adjacent cell information, so that the base station can be selectively adaptive to the surrounding base stations, and the switching success rate is improved.
Drawings
Fig. 1 is a schematic diagram of an LTE mobile network system;
FIG. 2 is a flow chart of a method for automatically switching cell types according to the present invention;
fig. 3 is a flowchart of a method according to a first embodiment of the invention.
Detailed Description
In order to explain technical contents, objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
The most key concept of the invention is as follows: and triggering S1 switching signaling flow through the source base station, analyzing according to a switching message responded by the core network, and switching the cell types in the neighbor cell list according to a failure value responded by the core network when the switching fails.
Referring to fig. 2, a method for automatically switching cell types includes:
the source base station sends a switching request message to a core network;
if the core network returns a switching response signaling message, judging that the cell type in the current adjacent cell is effective and storing the cell type;
if the core network returns a switching preparation failure signaling message, judging whether the target base station number in the switching request message is wrong or not according to the switching preparation failure signaling message;
if yes, switching the cell type of the current adjacent cell.
From the above description, the beneficial effects of the present invention are: the base station is selectively adaptive to the surrounding base stations, and the switching success rate is improved.
Further, the "the source base station sends the handover request message to the core network" specifically includes:
and when the measurement report reported by the mobile terminal meets the switching threshold, the source base station acquires the cell type in the current adjacent cell and sends a switching request message to the core network according to the cell type.
Further, the "determining whether the target base station number in the handover request message is wrong according to the handover preparation failure signaling message" specifically includes:
judging whether the Cause, namely the radio network (0) carried in the switching preparation failure signaling message is ho-failure-in-target-EPC-eNB-or-target-system (6);
if so, judging that the target base station number in the switching request message is wrong.
As can be seen from the above description, if Cause: radioNetwork (0) is the above parameter, it means that there may be an error in the eNB-ID IE in the targeteNB-ID carried in the S1 handover signaling triggered by the source base station, resulting in that the core network cannot identify the target base station only according to the eNB-ID IE in the targeteNB-ID.
Further, if yes, switching the cell type of the current neighboring cell specifically includes:
if yes, adding one to the failure times;
and when the failure times reach a preset threshold value, switching the cell type of the current adjacent cell.
Further, the value range of the preset threshold value is 0-8.
Further, the preset threshold value is 4.
As can be seen from the above description, by introducing the judgment of the failure times, the process of frequently updating the cell types is limited by the times, the smaller the threshold value is set, the faster the automatic updating of the cell types can be performed, and the larger the threshold value is set, the more frequent updating of the cell types can be avoided; when the threshold value is 0, it indicates that the automatic updating of the cell type is prohibited.
The invention also proposes a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of:
the source base station sends a switching request message to a core network;
if the core network returns a switching response signaling message, judging that the cell type in the current adjacent cell is effective and storing the cell type;
if the core network returns a switching preparation failure signaling message, judging whether the target base station number in the switching request message is wrong or not according to the switching preparation failure signaling message;
if yes, switching the cell type of the current adjacent cell.
Further, the "the source base station sends the handover request message to the core network" specifically includes:
and when the measurement report reported by the mobile terminal meets the switching threshold, the source base station acquires the cell type in the current adjacent cell and sends a switching request message to the core network according to the cell type.
Further, the "determining whether the target base station number in the handover request message is wrong according to the handover preparation failure signaling message" specifically includes:
judging whether the Cause, namely the radio network (0) carried in the switching preparation failure signaling message is ho-failure-in-target-EPC-eNB-or-target-system (6);
if so, judging that the target base station number in the switching request message is wrong.
Further, if yes, switching the cell type of the current neighboring cell specifically includes:
if yes, adding one to the failure times;
and when the failure times reach a preset threshold value, switching the cell type of the current adjacent cell.
Further, the value range of the preset threshold value is 0-8.
Further, the preset threshold value is 4.
Example one
Referring to fig. 3, a first embodiment of the present invention is: a method for automatically switching cell types comprises the following steps:
s1: the source base station sends a switching request message to a core network; specifically, after a measurement report reported by the mobile terminal meets a handover threshold, the source base station acquires a cell type in a current neighboring cell, and sends a handover request message to the core network according to the cell type, that is, triggers a handover preparation procedure, and sends a handover required message to the core network.
S2: judging whether the signaling message returned by the core network is a handover response signaling message (i.e. a handover command signaling message), if so, executing step S3, otherwise, returning the signaling message with a handover preparation failure (i.e. a handover preparation failure signaling message) by the core network, and executing step S4.
S3: and judging that the cell type in the current adjacent cell is effective and storing.
S4: judging whether the target base station number in the switching request message is wrong or not according to the switching preparation failure signaling message, if so, executing step S5, otherwise, monitoring whether the mobile terminal meets the switching threshold or not, and continuing to execute step S1; specifically, whether the Cause, namely the radio network (0), carried in the handover preparation failure signaling message is ho-failure-in-target-EPC-eNB-or-target-system (6) is judged, and the value means that an eNB-ID IE in a target NB-ID carried in the S1 handover signaling triggered by the source base station may have an error, so that the core network cannot identify the target base station only according to the eNB-ID IE in the target NB-ID.
S5: adding one to the failure times; wherein the initial value of the number of failures is 0.
S6: and judging whether the failure times reach a preset threshold value, if so, executing the step S7, otherwise, monitoring whether the mobile terminal meets the switching threshold, and continuing to execute the step S1. Further, the preset threshold value is 0-8, and when the threshold value is 0, the automatic updating of the cell type is prohibited; preferably, the threshold value is 4. The frequent updating process of the cell types is limited by introducing the failure times, the smaller the threshold value is set, the quicker the automatic updating of the cell types can be carried out, and the larger the threshold value is set, the frequent updating of the cell types can be avoided.
S7: switching the cell type of the current adjacent cell; that is, if the original cell type is home, the cell is switched to macro, and if the original cell type is macro, the cell is switched to home.
The cell types are divided into macro (macro) and home (home base station), and the setting relation of the cell types in the target neighbor cell parameters is calculated according to the switching success rate. From the actual docking environment test result, the base station is docked with a scenario of a direct connection gateway or a core network, and the types of cells to be configured in different scenarios are different.
In this embodiment, the S1 handover signaling flow is triggered by the source base station, and analyzed according to the handover message responded by the core network, when there is a handover failure, the cell parameter type in the neighbor cell list is selectively changed in combination with the statistics of the failure value and the failure times of the core network response, and the updated cell type is carried in the S1 handover signaling flow triggered subsequently. The method of the embodiment is used for realizing the maintenance of the cell type in the base station neighbor cell information. The problem of switching failure caused by errors of cell types is solved by selectively and automatically switching the cell type parameters in the adjacent cells, so that the switching success rate is improved.
Example two
The present embodiment is a specific application scenario of the first embodiment.
In this embodiment, the type of the target cell (frequency point 39150/PCI 199) is actually a macro type, and the threshold value T _ threshold is set to be 4.
In the neighbor list of the source base station, the cell type of the neighbor is initially home, after the terminal meets the handover threshold, a handover required message is used to trigger S1 handover preparation process, and the ID carried in the signaling of the procedureCode ID-handover (0) is as follows:
eNB-ID:homeENB-ID(1)
homeENB-ID:0006e860[bit length 28,4LSB pad bits,0000 0000 0000 0110 1110 1000 0110....decimal value 28294]
and then the core network responds to the Handover PreparationFailure message, and the carried Cause explicitly marks radio network (ho-failure-in-target-EPC-eNB-or-target-system (6), namely the target base station cannot be identified.
After triggering S1 handover for the 4 th time, the base station automatically changes the cell type parameter of the neighboring cell according to the number of handover failures greater than or equal to a threshold value T _ threshold, the home is changed to macro, and in the S1 handover triggered subsequently, the ID carried in the signaling of the procedureCode ID-Handoverpreparation (0) is as follows:
eNB-ID:macroENB-ID(0)
macroENB-ID:0006e0[bit length 20,4LSB pad bits,0000 0000 0000 0110 1110....decimal value 110]
and then the base station receives the Handover Command message, which means that the cell type of the adjacent cell is effective and is stored and updated.
In the embodiment, the validity of the neighbor cell is verified and the complete supplement of the neighbor cell is performed by triggering the S1 handover procedure through the neighbor cell list existing in the base station, so that the neighbor cell information of the corresponding environment is perfected, the user requirements are met, and the user experience is improved.
EXAMPLE III
The present embodiment is a computer-readable storage medium corresponding to the above-mentioned embodiments, on which a computer program is stored, which when executed by a processor, performs the steps of:
the source base station sends a switching request message to a core network;
if the core network returns a switching response signaling message, judging that the cell type in the current adjacent cell is effective and storing the cell type;
if the core network returns a switching preparation failure signaling message, judging whether the target base station number in the switching request message is wrong or not according to the switching preparation failure signaling message;
if yes, switching the cell type of the current adjacent cell.
Further, the "the source base station sends the handover request message to the core network" specifically includes:
and when the measurement report reported by the mobile terminal meets the switching threshold, the source base station acquires the cell type in the current adjacent cell and sends a switching request message to the core network according to the cell type.
Further, the "determining whether the target base station number in the handover request message is wrong according to the handover preparation failure signaling message" specifically includes:
judging whether the Cause, namely the radio network (0) carried in the switching preparation failure signaling message is ho-failure-in-target-EPC-eNB-or-target-system (6);
if so, judging that the target base station number in the switching request message is wrong.
Further, if yes, switching the cell type of the current neighboring cell specifically includes:
if yes, adding one to the failure times;
and when the failure times reach a preset threshold value, switching the cell type of the current adjacent cell.
Further, the value range of the preset threshold value is 0-8.
Further, the preset threshold value is 4.
In summary, the method for automatically switching cell types and the computer-readable storage medium provided by the present invention trigger S1 handover signaling flow through the source base station, analyze according to the handover message responded by the core network, selectively change the cell parameter types in the neighbor cell list when there is a handover failure by combining statistics of the failure value and failure times of the core network response, and carry the updated cell types in the subsequently triggered S1 handover signaling flow. The problem of switching failure caused by errors of cell types is solved by selectively and automatically switching the cell type parameters in the adjacent cells, so that the switching success rate is improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method for automatically switching cell types, comprising:
triggering a source base station to send a switching request message to a core network, wherein the source base station collects neighbor cell information;
if the core network returns a switching response signaling message, judging that the cell type in the current adjacent cell is effective and storing the cell type;
if the core network returns a switching preparation failure signaling message, judging whether the target base station number in the switching request message is wrong or not according to the switching preparation failure signaling message;
if yes, automatically switching the cell type of the current adjacent cell.
2. The method for automatically switching cell types according to claim 1, wherein the step of sending the handover request message to the core network by the source base station specifically comprises:
and when the measurement report reported by the mobile terminal meets the switching threshold, the source base station acquires the cell type in the current adjacent cell and sends a switching request message to the core network according to the cell type.
3. The method according to claim 1, wherein the step of determining whether the target base station number in the handover request message is incorrect according to the handover preparation failure signaling message specifically comprises:
judging whether the Cause, namely the radio network (0) carried in the switching preparation failure signaling message is ho-failure-in-target-EPC-eNB-or-target-system (6);
if so, judging that the target base station number in the switching request message is wrong.
4. The method for automatically switching cell types according to claim 1, wherein the "if yes, switching the cell type of the current neighboring cell" specifically includes:
if yes, adding one to the failure times;
and when the failure times reach a preset threshold value, switching the cell type of the current adjacent cell.
5. The method of claim 4, wherein the preset threshold value ranges from 0 to 8.
6. The method of claim 4, wherein the predetermined threshold value is 4.
7. A computer-readable storage medium, on which a computer program is stored, which program, when executed by a processor, carries out the steps of:
triggering a source base station to send a switching request message to a core network, wherein the source base station collects neighbor cell information;
if the core network returns a switching response signaling message, judging that the cell type in the current adjacent cell is effective and storing the cell type;
if the core network returns a switching preparation failure signaling message, judging whether the target base station number in the switching request message is wrong or not according to the switching preparation failure signaling message;
if yes, automatically switching the cell type of the current adjacent cell.
8. The computer-readable storage medium according to claim 7, wherein the "the source base station sends the handover request packet to the core network" specifically includes:
and when the measurement report reported by the mobile terminal meets the switching threshold, the source base station acquires the cell type in the current adjacent cell and sends a switching request message to the core network according to the cell type.
9. The computer-readable storage medium according to claim 7, wherein the "determining whether the target base station number in the handover request message is incorrect according to the handover preparation failure signaling message" specifically includes:
judging whether the Cause, namely the radio network (0) carried in the switching preparation failure signaling message is ho-failure-in-target-EPC-eNB-or-target-system (6);
if so, judging that the target base station number in the switching request message is wrong.
10. The computer-readable storage medium according to claim 7, wherein the "if yes, switching the cell type of the current neighboring cell" specifically is:
if yes, adding one to the failure times;
and when the failure times reach a preset threshold value, switching the cell type of the current adjacent cell.
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