CN101848476A - Method, device and system for realizing self-optimization of switching parameter - Google Patents
Method, device and system for realizing self-optimization of switching parameter Download PDFInfo
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Abstract
The invention relates to a method, a device and a system for realizing self-optimization of a switching parameter. The method comprises the following steps of: acquiring a reestablishment reason for UE to initiate RRC connection reestablishment request and a mark of a source cell of the UE; counting the reported frequency of the cell over the current reestablishment reason; and if the reported frequency is higher than a preset threshold, correspondingly adjusting the switching parameter according to the reestablishment reason. The invention shows that the method, the device and the system can realize self-optimization of the switching parameter, reduce the human intervention of the network planning and the operation and maintenance and lower the establishment cost and the operation cost for the network.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a method, an apparatus, and a system for implementing handover parameter self-optimization.
Background
In a mobile communication system, when a UE (user equipment) in a connected state moves from one cell to another cell, or due to radio transmission, traffic load adjustment, equipment failure, and the like, in order to ensure continuity of user service, a network side conventionally needs to switch the user to a new cell, and provide service for the new cell.
In UMTS (Universal Mobile Telecommunications System) and LTE (Long Term Evolution), a network node performs handover decision according to a mobility measurement report of a UE to select a target cell for handover:
the UE executes measurement according to the measurement control command, and triggers and reports a measurement report when a reporting condition is met; commonly utilized measurement events are: the measured value of the adjacent cell + the individual deviation of the adjacent cell is larger than the measured value of the service cell + the individual deviation of the service cell + the relative threshold of switching; when the measured value of the adjacent cell meets the condition of the formula and the duration reaches the trigger time (time to trigger), triggering the measurement report, and then triggering the switching process after the network node receives the measurement report; the handover parameters affecting the handover process mainly include time to trigger, a handover relative threshold, and an individual offset of a serving cell.
However, if the handover parameter is not set properly, the probability of Radio Link Failure (RLF) or handover Failure (handover Failure) of the UE will be increased, which requires optimizing the handover parameter; in the former system of the LTE system, the setting of the handover parameters is manually performed, and the optimization of the corresponding handover parameters is also manually performed: specifically, network optimization personnel count the measurement results through actual drive tests, analyze the measurement results and adjust switching parameters; however, the optimization of the switching parameters by manpower greatly increases the cost of network construction and operation, and is difficult to meet the requirements of operators. Therefore, in LTE and later systems, it is desirable to reduce the manual involvement of network planning and operation maintenance and reduce the construction and operation costs of the network by improving the optimization scheme of handover parameters, and there is no ideal scheme for improving the optimization scheme of handover parameters in the prior art.
Disclosure of Invention
In view of this, the present invention provides a method, an apparatus, and a system for implementing handover parameter self-optimization, so as to reduce the manual involvement of network planning and operation maintenance, and reduce the construction and operation costs of the network.
In order to solve the above problems, the technical scheme provided by the invention is as follows:
a method for realizing switching parameter self-optimization comprises the following steps:
acquiring a reestablishment reason causing the UE to initiate an RRC connection reestablishment request and a source cell identifier of the UE;
counting the reported frequency of the cell under the current reconstruction reason;
and if the reported frequency is higher than a preset threshold value, adjusting the switching parameters according to the reestablishment reason.
Preferably, the cause of the UE initiating the RRC connection reestablishment request is a radio link failure.
Preferably, the adjusting the handover parameter according to the reestablishment reason includes:
and at least performing any one of the operations of reducing the trigger time, reducing the relative threshold of the switching and reducing the individual deviation of the service cell.
Preferably, the reestablishment reason causing the UE to initiate the RRC connection reestablishment request is handover failure.
Preferably, the adjusting the handover parameter according to the reestablishment reason includes:
and at least performing any one of operations of increasing the trigger time, improving the relative threshold of the switching and improving and reducing the individual deviation of the service cell.
Preferably, the size of the threshold value is in direct proportion to the number of users in the cell.
An apparatus for implementing handover parameter self-optimization, the apparatus comprising: the device comprises a receiving unit, a counting unit and an adjusting unit; wherein,
the receiving unit is used for acquiring a reestablishment reason causing the UE to initiate the RRC connection reestablishment request and an identifier of a source cell where the UE is located, and informing the counting unit;
the counting unit is used for counting the reported frequency of the cell under the reconstruction reason according to the notification of the receiving unit and notifying the adjusting unit;
the adjusting unit is configured to adjust a handover parameter according to a reestablishment reason when the frequency, counted by the counting unit, of the reported cell is higher than a preset threshold value.
Preferably, the reestablishment reason includes a radio link failure and a handover failure.
Preferably, the adjusting unit includes: the device comprises a judging module and a processing module; wherein,
the judging module is used for judging the reported frequency of the cell counted by the counting unit and the preset threshold value, and informing the processing module when the reported frequency is greater than the preset threshold value;
the processing module is used for executing at least any one of operations of reducing the trigger time, reducing the relative threshold of switching and reducing the individual deviation of the service cell according to the notification of the judging module, or executing at least any one of operations of increasing the trigger time, improving the relative threshold of switching and improving the individual deviation of the service cell.
A system for implementing handover parameter self-optimization, comprising: a base station and an operation and maintenance platform; wherein,
the base station is used for receiving an RRC connection reestablishment request initiated by the UE and reporting a reestablishment reason causing the UE to initiate the RRC connection reestablishment request and an identifier of a source cell where the UE is located, which are contained in the request, to the operation and maintenance platform;
the operation maintenance platform is used for receiving the reestablishment reason and the cell identification reported by the base station, counting the reported frequency of the cell under the current reestablishment reason, and if the reported frequency is higher than a preset threshold value, adjusting the switching parameter according to the reestablishment reason.
It can be seen that, by using the method, apparatus and system of the present invention, according to the influence of each handover parameter on the handover process, the frequency reported by the cell under the condition of the re-establishment reason and the identifier of the source cell where the UE is located are counted by using the re-establishment reason initiating the RRC (Radio Resource Control) connection re-establishment request, and compared with the preset threshold to determine whether the handover parameter is set properly, if not, the handover parameter is adjusted, thereby influencing the handover process, further realizing the self-optimization of the handover parameter, reducing the manual participation of network planning and operation maintenance, and reducing the construction and operation costs of the network.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Figure 1 is a flow chart of an RRC connection reestablishment procedure;
FIG. 2 is a schematic flow chart of the method of example 1 of the present invention;
FIG. 3 is a schematic flow chart of the method of example 2 of the present invention;
FIG. 4 is a schematic flow chart of the method of example 3 of the present invention;
FIG. 5 is a schematic structural diagram of an apparatus according to embodiment 4 of the present invention.
Detailed Description
In the LTE system, at present, an RRC connection reestablishment process is triggered after a radio link failure or a handover failure occurs in a UE, as shown in fig. 1, where an RRC connection reestablishment request message carries a reestablishment reason and an identifier of a source cell; however, if the handover parameter settings are not appropriate, premature handover may result: when the source base station sends a switching command to the UE to inform the UE to initiate a random access process to a target cell, the UE is far away from the target base station due to too early switching, so that the switching fails, and at the moment, the UE initiates a reestablishment reason carried in an RRC connection reestablishment request message, namely, the reason indicates that the switching fails; at the same time, if the handover parameter settings are not appropriate, too late a handover may also result: that is, the base station has not yet sent and sent the handover command to the UE, the UE has RLF in the source cell without being in time to handover, and at this time, when another cell performs RRC connection reestablishment, the reestablishment reason carried in the RRC connection reestablishment request message is indicated as RLF.
Thus, the switching parameters that have been set are adjusted, i.e. the switching process is adjusted accordingly too early or too late: if the time to trigger value is reduced, or the relative threshold of handover is reduced, or the individual deviation of the serving cell is reduced, the measurement report is triggered earlier, so that the handover process is triggered earlier; conversely, increasing these handover parameter values delays the triggering of the handover procedure.
In view of the above analysis, the basic idea of implementing handover parameter self-optimization proposed by the present invention is to adjust handover parameters by using information carried in an RRC connection reestablishment request message according to the influence of each handover parameter on the handover process, and specifically, to adjust handover parameters according to the reestablishment reason carried in the RRC connection reestablishment request message to influence the handover process, thereby implementing self-optimization of handover parameters, further reducing the manual participation of network planning and operation maintenance, and reducing the construction and operation costs of the network.
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Embodiment 1 of the present invention provides a method for implementing handover parameter self-optimization, and as shown in fig. 2, the method includes:
in step 201, acquiring a reason why the UE initiates RRC connection reestablishment and an identifier of a source cell where the UE is located;
specifically, when the UE initiates an RRC connection reestablishment request, an RRC connection reestablishment request message is sent to the base station, where the request message includes a reestablishment reason and an identifier of a source cell where the UE is located; after receiving the RRC connection reestablishment request message, the base station reports the reestablishment reason and the source cell identifier in the request message to the network side device, which in this embodiment is an operation and maintenance (O & M) platform, but is not limited thereto; it should be noted that, in the embodiment of the present invention, the reestablishment reason includes, but is not limited to, a radio link failure and a handover failure; if the switching parameter setting is not appropriate, and premature switching is caused, the source base station sends a switching command to the UE to inform the UE of switching failure caused by premature switching and long distance between the UE and the target base station when the UE initiates a random access process to the target cell, and at this time, the reestablishment reason is indicated as switching failure; if the switching parameter is set improperly, resulting in too late switching, the base station has not yet sent a switching command and sends a switching command to the UE, and the UE generates RLF when not switched, and the reestablishment reason is indicated as RLF;
in step 202, counting the reported frequency of the cell under the current reestablishment reason; taking the operation maintenance platform as an example, after receiving the reestablishment reason and the cell identifier reported by the base station, counting the reported frequency of the source cell where the UE is located under the current reestablishment reason, where the source cell is only for the UE, and the network side device does not distinguish between the so-called source cell and the target cell, but only counts the reported frequency of the cell under the reestablishment reason, but in fact, the counted cell and the source cell where the UE is located are the same cell, and those skilled in the art should easily understand that details are not described herein; if the reestablishment reason is a radio link failure, the operation maintenance platform counts the reported frequency of the cell under the condition of radio path failure; if the reestablishment reason is the switching failure, the operation maintenance platform counts the reported frequency of the cell under the condition of the switching failure;
in step 203, when the reported frequency is higher than a preset threshold value, adjusting a handover parameter according to a reestablishment reason; if the reported frequency is not higher than the threshold value, the setting of the current handover parameter can be considered to be in a normal condition, and no adjustment is made, which is not described in detail herein;
specifically, the reporting frequency refers to the number of times reported in unit time, that is, the number of times the cell is reported in unit time under the current reestablishment reason; if the load of a cell is higher and the number of users is large, the reporting times are more relative to the cells with light load, the reporting frequency is high, but the handover parameter setting of the cell is not proper, so a threshold value needs to be set for comparing with the reporting frequency to determine whether the handover parameter setting is proper; it should be noted that the threshold value is proportional to the number of users, and the threshold value may take into account the number of activated users or the number of edge users in the cell, and other factors, and of course, those skilled in the art can also easily understand that the setting of the threshold value may also be specifically set according to the actual situation in the specific implementation, and details are not described here;
due to various situations of the reestablishment reason, the subsequent adjustment of the switching parameter is correspondingly carried out according to the specific reestablishment reason; for example, if the current re-establishment cause is a radio link failure, it may be caused by too late handover due to improper handover parameter setting, in this case, when the reported frequency is higher than the threshold, it indicates that the handover of the cell UE is too late, and the adjustment of the handover parameter performed at this time may be to decrease time to trigger, or decrease a relative handover threshold, or decrease a serving cell individual offset, etc.; for another example, if the current re-establishment cause is handover failure, it may be caused by too early handover due to inappropriate handover parameter setting, in this case, when the reported frequency is higher than the threshold value, it indicates that the handover of the cell UE is too early, and the adjustment of the handover parameter performed at this time may be to increase time to trigger, or to increase a relative handover threshold, or to increase a serving cell personality deviation, or the like; of course, the adjustment of the handover parameters in the above two examples can also be performed in combination: when the reestablishment reason is the failure of the wireless link, at least any one operation of reducing the time to trigger, reducing the relative threshold of the switching and reducing the individual deviation of the service cell is executed; when the reconstruction reason is the switching failure, at least any one of the operations of increasing the time to trigger, improving the relative switching threshold and increasing the individual deviation of the service cell is executed.
The method in the embodiment of the present invention is mainly characterized by qualitatively adjusting the handover parameter according to the reconstruction reason to achieve self-optimization of the handover parameter, and as for qualitative adjustment in specific implementation, those skilled in the art can easily understand that the method may be specifically performed according to actual conditions on the basis of the qualitative adjustment, and details are not repeated here.
The method for implementing handover parameter self-optimization in the above embodiment is described in detail below by using a specific reestablishment reason, as shown in embodiment 2 shown in fig. 3, taking a reestablishment reason indication as an example of a radio link failure:
if the handover parameters are not properly set, which may result in too late handover, the UE is in the source cell and is not in time for handover to occur with RLF, and at this time,
in step S301, the UE initiates an RRC connection reestablishment request to the base station;
in step S302, the base station receives an RRC connection reestablishment request message initiated by the UE due to RLF, where the request message includes a reestablishment reason indicated as RLF and a source cell identifier;
in step S303, the base station reports the reestablishment reason and the source cell identifier in the request message to the O & M;
in step S304, O & M counts the frequency of the cell reported for the reason of RLF;
in step S305, determining whether the reported frequency is higher than a preset threshold, if so, indicating that the handover of the cell UE is too late, and executing step S306; otherwise, not processing;
in step S306, the O & M adjusts the handover parameter by performing at least one of the operations of reducing the time to trigger, lowering the handover relative threshold, and lowering the individual offset of the serving cell, so as to achieve self-optimization of the handover parameter.
As shown in embodiment 3 of fig. 4, taking the reestablishment reason indication as an example of the handover failure:
if the switching parameter is not properly set, premature switching can be caused, the source base station sends a switching command to the UE, the UE initiates a random access process to the target cell, and the UE is far away from the target base station due to the premature switching, thereby causing the switching failure,
in step S401, the UE initiates an RRC connection reestablishment request for handover failure to the base station;
in step S402, the base station receives an RRC connection reestablishment request message initiated by the UE due to the handover failure, where the request message includes a reestablishment reason and a source cell identifier indicated as the handover failure;
in step S403, the base station reports the reestablishment reason and the source cell identifier in the request message to the O & M;
in step S404, O & M counts the reported frequency of the cell for the reason of handover failure;
in step S405, determining whether the reported frequency is higher than a preset threshold, if so, indicating that the UE in the cell is switched too early, and executing step S406; otherwise, not processing;
in step S406, the O & M adjusts the handover parameter by performing at least one of the operations of increasing the time to trigger, increasing the handover relative threshold, and increasing the individual offset of the serving cell, so as to achieve self-optimization of the handover parameter.
It can be seen that, by adopting the method of the embodiment of the present invention, according to the influence of each handover parameter on the handover process, the handover parameter is adjusted by using the reestablishment reason carried in the RRC connection reestablishment request message to influence the handover process, thereby realizing the self-optimization of the handover parameter, further reducing the manual participation of network planning and operation maintenance, and reducing the construction and operation costs of the network.
Based on the above idea, embodiment 4 of the present invention further proposes an apparatus for implementing self-optimization of handover parameters, as shown in fig. 5, the apparatus 500 includes: a receiving unit 510, a counting unit 520, and an adjusting unit 530; wherein,
the receiving unit 510 is configured to acquire a reestablishment reason causing the UE to initiate an RRC connection reestablishment request and an identifier of a source cell where the UE is located, and notify the counting unit 520;
the counting unit 520 is configured to count the reported frequency of the cell for the re-establishment cause according to the notification of the receiving unit 510, and notify the adjusting unit 530;
the adjusting unit 530 is configured to adjust the handover parameter according to a reestablishment reason when the frequency, which is counted by the counting unit 520 and reported by the cell, is higher than a preset threshold value.
Wherein the reestablishment reason comprises radio link failure and handover failure.
In specific implementation, preferably, the adjusting unit 530 includes: a judging module 531 and a processing module 532; the judging module 531 is configured to judge the reported frequency of the cell counted by the counting unit 520 and the preset threshold, and notify the processing module 532 when the reported frequency is greater than the preset threshold; the processing module 532 is configured to at least perform any one of operations of reducing the trigger time, reducing the relative handover threshold, and reducing the individual offset of the serving cell, or at least perform any one of operations of increasing the trigger time, increasing the relative handover threshold, and increasing the individual offset of the serving cell according to the notification of the determining module 531.
In addition, embodiment 5 of the present invention further provides a system for implementing handover parameter self-optimization, where the system includes: a base station and an operation and maintenance platform; wherein,
the base station not only has the functions of the existing base station and the connection relation with other devices, but also receives an RRC connection reestablishment request initiated by the UE, and reports the reestablishment reason causing the UE to initiate the RRC connection reestablishment request and the identification of the source cell where the UE is located, which are contained in the request, to the operation and maintenance platform;
the operation maintenance platform is used for receiving the reestablishment reason and the cell identification reported by the base station, counting the reported frequency of the cell under the current reestablishment reason, and if the reported frequency is higher than a preset threshold value, correspondingly adjusting the switching parameter according to the reestablishment reason; specifically, the operation maintenance platform in this embodiment is substantially the same as the device in embodiment 4, and may also include, but is not limited to, the receiving unit 510, the counting unit 520, and the adjusting unit 530 in the above embodiment, and the connection relationship between the units and the implemented functions are also the same as those in the device in the above embodiment, and are not described again here.
Those of skill in the art would understand that information, messages, and signals may be represented using any of a variety of different technologies and techniques. For example, the messages and information mentioned in the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or any combination thereof.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method for realizing self-optimization of handover parameters is characterized by comprising the following steps:
acquiring a reestablishment reason causing the UE to initiate an RRC connection reestablishment request and an identifier of a source cell where the UE is located;
counting the reported frequency of the cell under the current reconstruction reason;
and if the reported frequency is higher than a preset threshold value, adjusting the switching parameters according to the reestablishment reason.
2. The method of claim 1, wherein:
the reestablishment reason causing the UE to initiate the RRC connection reestablishment request is a radio link failure.
3. The method of claim 2, wherein the adjusting the handover parameter according to the re-establishment cause comprises:
and at least performing any one of the operations of reducing the trigger time, reducing the relative threshold of the switching and reducing the individual deviation of the service cell.
4. The method of claim 1, wherein:
the reestablishment reason causing the UE to initiate the RRC connection reestablishment request is handover failure.
5. The method of claim 4, wherein the adjusting the handover parameter according to the re-establishment cause comprises:
and at least performing any one of operations of increasing the trigger time, improving the relative threshold of the switching and improving and reducing the individual deviation of the service cell.
6. The method according to any one of claims 3 or 5, wherein:
the size of the threshold value is in direct proportion to the number of users in the cell.
7. An apparatus for implementing handover parameter self-optimization, the apparatus comprising: the device comprises a receiving unit, a counting unit and an adjusting unit; wherein,
the receiving unit is used for acquiring a reestablishment reason causing the UE to initiate the RRC connection reestablishment request and an identifier of a source cell where the UE is located, and informing the counting unit;
the counting unit is used for counting the reported frequency of the cell under the reconstruction reason according to the notification of the receiving unit and notifying the adjusting unit;
the adjusting unit is configured to adjust a handover parameter according to a reestablishment reason when the frequency, counted by the counting unit, of the reported cell is higher than a preset threshold value.
8. The apparatus of claim 7, wherein:
the re-establishment causes include radio link failure and handover failure.
9. The apparatus of claim 8, wherein the adjusting unit comprises: the device comprises a judging module and a processing module; wherein,
the judging module is used for judging the reported frequency of the cell counted by the counting unit and the preset threshold value, and informing the processing module when the reported frequency is greater than the preset threshold value;
the processing module is used for executing at least any one of operations of reducing the trigger time, reducing the relative threshold of switching and reducing the individual deviation of the service cell according to the notification of the judging module, or executing at least any one of operations of increasing the trigger time, improving the relative threshold of switching and improving the individual deviation of the service cell.
10. A system for implementing handover parameter self-optimization, comprising: a base station and an operation and maintenance platform; wherein,
the base station is used for receiving an RRC connection reestablishment request initiated by the UE and reporting a reestablishment reason causing the UE to initiate the RRC connection reestablishment request and an identifier of a source cell where the UE is located, which are contained in the request, to the operation and maintenance platform;
the operation maintenance platform is used for receiving the reestablishment reason and the cell identification reported by the base station, counting the reported frequency of the cell under the current reestablishment reason, and if the reported frequency is higher than a preset threshold value, adjusting the switching parameter according to the reestablishment reason.
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| CN108668297A (en) * | 2017-03-29 | 2018-10-16 | 中国移动通信集团贵州有限公司 | Method of adjustment, the device and system of wireless switching timer |
| CN110312289A (en) * | 2019-06-20 | 2019-10-08 | 展讯通信（上海）有限公司 | Cell determination method, device, terminal device and storage medium |
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